Automatic granular fertilizer sampling device

Abstract

The utility model relates to an automatic granular fertilizer sampling device. Comprising a granular fertilizer finished product belt conveyor, the top of the granular fertilizer finished product belt conveyor is provided with a rotary double-channel sampling unit for sampling hour samples and comprehensive samples, and the tail end of the rotary double-channel sampling unit is provided with an automatic rotary storage unit for storing the hour samples and the comprehensive samples; the rotary dual-channel sampling unit is obliquely arranged, a power driving unit is arranged at the upper part of the rotary dual-channel sampling unit, and an automatic rotary storage unit is arranged at the lower part of the rotary dual-channel sampling unit; the automatic sampling device has the advantages of realizing automatic sampling without the operation of sampling personnel, reducing the labor intensity of workers, ensuring the sampling time, improving the sampling accuracy and avoiding sampling deviation.

Description

Technical Field

[0001] The utility model relates to the technical field of fertilizer granule sampling, in particular to an automatic sampling device for granular fertilizers. Background Art

[0002] Fertilizer refers to a substance that can supply nutrients required for crop growth and development, improve soil properties, and increase crop yield and quality. In order to ensure that fertilizers have the above effects, it is necessary to sample fertilizers during the production process to ensure fertilizer quality.

[0003] In the actual sampling process, manual on-line sampling or semi-automatic manual on-line sampling is generally used. Taking manual on-line sampling as an example, the sampling personnel take samples at fixed sampling points every 10 - 15 minutes, with each sampling amount being about 100 grams. The samples taken each hour are gathered in a sample bottle as the hourly sample for this period. At the same time, about 30 grams are set aside from each sampling and gathered in a comprehensive sample bottle as the shift comprehensive sample. The above working process has relatively high requirements for sampling personnel. The sampling frequency is once every 10 - 15 minutes, and the personnel are basically fixed at their posts. All activities and work have only a 10 - 15 - minute interval. The labor cost is high, the labor intensity and sampling time cannot be guaranteed, and sampling may occur prematurely or lag, resulting in sampling deviation. Semi-automatic sampling means that a motor drives a conical sampling cylinder to rotate. A sampling branch pipe is arranged on the sampling cylinder, and there is a sampling hole at the end of the branch pipe for sampling. When the branch pipe rotates to the low position, sampling is carried out, and when it is at the high position, the sample falls into the conical cylinder along the inner wall of the branch pipe, continuously sampling. The samples are gathered in the conical cylinder. There is a sample discharging port at the bottom of the conical cylinder. The plug board is closed during work and opened during sample discharging. Samples are discharged once every hour and put into a sample bottle as the hourly sample. At the same time, about 50 grams of the sample are separated and put into a comprehensive sample bottle. There are 8 samplings per shift, and they are gathered together as the shift comprehensive sample. The aforementioned process also requires a special person to be responsible. At the same time, there are problems such as high labor cost, inability to guarantee labor intensity and sampling time, and sampling may occur prematurely or lag, resulting in sampling deviation. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an automatic sampling device for granular fertilizers to overcome the defects in the prior art.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An automatic sampling device for granular fertilizer, comprising a finished product belt conveyor for granular fertilizer. A rotary dual-channel sampling unit for taking hourly samples and composite samples is provided at the top of the finished product belt conveyor for granular fertilizer, and the rotary dual-channel sampling unit is connected to an automatic rotary storage unit for storing hourly samples and composite samples; the rotary dual-channel sampling unit is inclined, a power driving unit is provided at the upper part of the rotary dual-channel sampling unit, and an automatic rotary storage unit is provided at the lower part of the rotary dual-channel sampling unit.

[0007] The beneficial effects of the present utility model are as follows: The present utility model abandons the traditional method of sampling first and then manually dividing the samples, and adopts a rotary dual-channel sampling unit to separately sample hourly samples and composite samples, so as to achieve the feature of automatic sampling without the need for sampling personnel to operate. Further, through the inclined setting, the fertilizer particle samples in the hourly samples and composite samples can respectively enter the automatic rotary storage unit for storage according to their own gravity, so as to achieve the features of reducing the manual labor intensity, ensuring the sampling time, improving the sampling accuracy, and avoiding sampling deviation.

[0008] Preferably, the rotary dual-channel sampling unit includes brackets provided on the outer sides of both sides of the finished product belt conveyor for granular fertilizer. Bearing seats are respectively provided at the tops of the brackets, and a rotary dual-channel sampling part is provided in the bearing seats; the rotary dual-channel sampling part includes a sleeve-type structural member that rotates coaxially to enable the sample granular fertilizer to move downward to the lower part of the rotary dual-channel sampling unit according to its own gravity, and sampling parts corresponding to the two channels are provided on the sleeve-type structural member.

[0009] Preferably, the sleeve-type structural member includes a nested sampling inner tube and a nested sampling outer tube sleeved outside the nested sampling inner tube. The front part of the nested sampling inner tube is sleeved in the corresponding bearing seat, and its top is connected to the power driving unit. The end of the nested sampling inner tube is connected to the composite sample storage part inside the automatic rotary storage unit; the nested sampling outer tube is arranged in the middle and rear part of the nested sampling inner tube, the middle part of the nested sampling outer tube is sleeved in the corresponding bearing seat, and the end of the nested sampling outer tube is connected to the hourly sample storage part inside the automatic rotary storage unit.

[0010] Preferably, the sampling parts include a first sampling tube for taking composite samples and a second sampling tube for taking hourly samples. The first sampling tube is connected to the middle part of the nested sampling inner tube, and the second sampling tube is connected to the front part of the nested sampling outer tube.

[0011] Preferably, the automatic rotation storage unit includes a sample storage sealed cavity, a comprehensive sample storage part and an hourly sample storage part arranged in the sample storage sealed cavity. A sealing cover is provided at the top of the sample storage sealed cavity, and a sample circulation part is provided on the sealing cover. A rotating disk is provided at the inner bottom of the sample storage sealed cavity. The bottom of the rotating disk is connected to a rotating shaft, and the rotating shaft passes through the storage sealed cavity and is connected to the power output end of a sample storage rotating motor arranged at the bottom of the storage sealed cavity.

[0012] Preferably, the comprehensive sample storage part includes a comprehensive sample bottle arranged in the middle of the rotating disk, and the hourly sample storage part includes hourly sample bottles arranged around the comprehensive sample bottle; the sample circulation part includes a comprehensive sample circulation pipeline and an hourly sample circulation pipeline. The upper parts of the comprehensive sample circulation pipeline and the hourly sample circulation pipeline are in a funnel-shaped structure. The comprehensive sample bottle is arranged at the lower part of the comprehensive sample circulation pipeline, and hourly sample bottles are arranged at the corresponding positions at the lower part of the hourly sample circulation pipeline.

[0013] Preferably, a sampling cylinder side wall of an integral structure is provided on the outer circumference of the rotating disk. A foam filling layer is provided between the sampling cylinder side wall and the hourly sample bottles and the comprehensive sample bottle; sealing cavity brackets are provided around the bottom of the sample storage sealed cavity; the end of the nested sampling inner tube is communicated with the comprehensive sample circulation pipeline, and the end of the nested sampling outer tube is communicated with the hourly sample circulation pipeline.

[0014] Preferably, a rotating motor bracket is provided on the outer side of the corresponding bracket at the upper part of the rotating double-channel sampling unit. A rotating motor is provided on the rotating motor bracket, and the rotating motor is connected to the top of the nested sampling inner tube through a transmission device.

[0015] A kind of automatic sampling device for granular fertilizer made according to the above scheme. In the traditional fertilizer sampling method (whether manual sampling or semi-automatic sampling), unified sampling is carried out during sampling. After sampling, the hourly samples and comprehensive samples are separated manually and then stored separately. The above process causes problems such as too high requirements for sampling personnel (high sampling frequency, high labor intensity, and accurate time requirements). The utility model adopts the method of separately sampling the hourly samples and comprehensive samples for the above problems, and through an inclined structure form, the hourly samples and comprehensive samples enter the automatic rotating storage unit for storage through their respective channels under the action of their own gravity, so as to achieve the characteristics of reducing the labor intensity of sampling personnel, ensuring the sampling time, improving the sampling accuracy, and avoiding sampling deviation. The utility model drives the rotating double-channel sampling unit to carry out separate sampling based on the power drive unit. The nested sampling tube in the rotating double-channel sampling unit is a sleeve structure, thus forming two fertilizer particle sample circulation channels, and through the inclined setting, the fertilizer particle samples enter the automatic rotating storage unit under the action of their own gravity. At the same time, the automatic rotating storage unit includes an hourly sample storage part that can replace the hourly sample bottle after rotation, and the comprehensive sample bottle will not be replaced after rotation. The above method can be designed according to the sampling characteristics of granular fertilizer samples to meet the storage of hourly samples and comprehensive samples under the premise of high-frequency sampling. It has the advantages of realizing automatic sampling without the operation of sampling personnel, reducing manual labor intensity, ensuring the sampling time, improving the sampling accuracy, and avoiding sampling deviation. Description of the Drawings

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

[0017] Figure 2 It is a schematic structural diagram of the automatic rotating storage unit of the utility model.

[0018] Figure 3 It is a schematic diagram of the positional relationship between the side wall of the sampling cylinder and the foam filling layer of the utility model.

[0019] In the figure: 1. Granular fertilizer finished product belt conveyor; 2. Support; 3. Bearing seat; 4. Nested sampling inner tube; 5. Nested sampling outer tube; 6. First sampling tube; 7. Second sampling tube; 8. Sample storage sealing cavity; 9. Sealing cover; 10. Rotating disk; 11. Rotating shaft; 12. Sample storage rotating motor; 13. Comprehensive sample bottle; 14. Hourly sample bottle; 15. Comprehensive sample circulation pipeline; 16. Hourly sample circulation pipeline; 17. Side wall of the sampling cylinder; 18. Sealing cavity support; 19. Rotating motor support; 20. Rotating motor; 21. Foam filling layer. Detailed Embodiment

[0020] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model.

[0021] Referring to Figures 1-3 As shown, the present utility model is an automatic sampling device for granular fertilizers, including a granular fertilizer finished product belt conveyor 1. A rotary dual-channel sampling unit for taking hourly samples and composite samples is provided at the top of the granular fertilizer finished product belt conveyor 1. The rotary dual-channel sampling unit is connected to an automatic rotary storage unit for storing hourly samples and composite samples; the rotary dual-channel sampling unit is inclined. A power driving unit is provided at the upper part of the rotary dual-channel sampling unit, and an automatic rotary storage unit is provided at the lower part of the rotary dual-channel sampling unit. The present utility model uses the power driving unit as the power to drive the rotary dual-channel sampling unit. During the process of driving the rotary dual-channel sampling unit to rotate, sampling is carried out. After sampling, the fertilizer particle samples automatically enter the automatic rotary storage unit for storage under the cooperation of their own gravity and the inclined setting; the present utility model is different from the traditional technology in which hourly samples and composite samples are uniformly obtained and then manually separated; instead, separate sampling is adopted, and they are transported and stored through their respective channels to achieve the purpose of automatic sampling.

[0022] Furthermore, the rotary dual-channel sampling unit includes brackets 2 provided outside both sides of the granular fertilizer finished product belt conveyor 1. Bearing seats 3 are respectively provided at the tops of the brackets 2, and a rotary dual-channel sampling part is provided inside the bearing seats 3; the rotary dual-channel sampling part includes a sleeve-type structural member that rotates coaxially to enable sample granular fertilizers to move downward along their own gravity to the lower part of the rotary dual-channel sampling unit, and sampling members corresponding to the two channels respectively provided on the sleeve-type structural member. The brackets 2 of the present utility model are provided outside both sides of the granular fertilizer finished product belt conveyor 1 to support the rotary dual-channel sampling part and can achieve the characteristic of facilitating sampling; the rotary dual-channel sampling part is inclined, so the heights of the two brackets 2 are different to meet the characteristic of its inclined setting. By providing the bearing seats 3, the rotary dual-channel sampling part can be supported and rotated at the same time; by providing the sleeve-type structural member, the characteristics of storing hourly samples and composite samples respectively through corresponding flow channels can be achieved.

[0023] Further, the sleeve - type structural member includes a nested sampling inner tube 4, and a nested sampling outer tube 5 sleeved outside the nested sampling inner tube 4. The front part of the nested sampling inner tube 4 is sleeved in the corresponding bearing seat 3, its top is connected to the power driving unit, and the end of the nested sampling inner tube 4 is communicated with the comprehensive sample storage part inside the automatic rotation storage unit; the nested sampling outer tube 5 is arranged in the middle - rear part of the nested sampling inner tube 4, the middle part of the nested sampling outer tube 5 is sleeved in the corresponding bearing seat 3, and the end of the nested sampling outer tube 5 is communicated with the hourly sample storage part inside the automatic rotation storage unit. Through the above - mentioned settings, the present utility model can achieve the purpose of simultaneously driving the sleeve - type structural member to rotate by the same power driving unit. Through the above rotation, the separate collection of hourly samples and comprehensive samples can be realized, and the collected samples can enter the corresponding channels respectively; the characteristic of avoiding manual separation is achieved.

[0024] Further, the sampling member includes a first sampling tube 6 for taking comprehensive samples and a second sampling tube 7 for taking hourly samples. The first sampling tube 6 is communicated with the middle part of the nested sampling inner tube 4, and the second sampling tube 7 is communicated with the front part of the nested sampling outer tube 5.

[0025] Further, the automatic rotation storage unit includes a sample storage sealed cavity 8 and a comprehensive sample storage part and an hourly sample storage part arranged inside the sample storage sealed cavity 8. A sealing cover 9 is provided at the top of the sample storage sealed cavity 8, a sample circulation member is provided on the sealing cover 9, a rotating disk 10 is provided at the inner bottom of the sample storage sealed cavity 8, the bottom of the rotating disk 10 is connected to a rotating shaft 11, and the rotating shaft 11 passes through the storage sealed cavity 8 and is connected to the power output end of a sample storage rotating motor 12 arranged at the bottom of the storage sealed cavity 8. The present utility model utilizes the characteristics that the displacement of the center position does not change and the position far from the center changes during the rotation of the rotating disk 10, and applies this characteristic to the comprehensive sample storage part and the hourly sample storage part to achieve the characteristic of automatically storing comprehensive samples and hourly samples without manual intervention.

[0026] Further, the comprehensive sample storage part includes a comprehensive sample bottle 13 arranged in the middle of the rotating disk 10, and the hourly sample storage part includes hourly sample bottles 14 arranged around the comprehensive sample bottle 13; the sample circulation member includes a comprehensive sample circulation pipeline 15 and an hourly sample circulation pipeline 16. The upper parts of the comprehensive sample circulation pipeline 15 and the hourly sample circulation pipeline 16 are in a funnel - like structure. The comprehensive sample bottle 13 is arranged at the lower part of the comprehensive sample circulation pipeline 15, and the hourly sample bottles 14 are arranged at the corresponding positions at the lower part of the hourly sample circulation pipeline 16.

[0027] Further, an integrally structured sampling cylinder side wall 17 is provided on the outer circumference of the rotary disk 10, and a foam filling layer 21 is provided between the sampling cylinder side wall 17 and the hourly sample bottle 14 and the comprehensive sample bottle 13; sealing chamber brackets 18 are provided around the bottom of the sample storage and sealing chamber 8; the end of the nested sampling inner tube 4 is communicated with the comprehensive sample circulation pipeline 15, and the end of the nested sampling outer tube 5 is communicated with the hourly sample circulation pipeline 16.

[0028] Further, a rotary motor bracket 19 is provided outside the corresponding bracket 2 at the upper part of the rotary dual-channel sampling unit, and a rotary motor 20 is provided on the rotary motor bracket 19. The rotary motor 20 is connected to the top of the nested sampling inner tube 4 through a transmission device. The transmission device described in the present utility model is in the form of a traditional transmission structure, such as shaft transmission, gear transmission, belt transmission, etc., for the purpose of driving the rotary dual-channel sampling unit to rotate on the premise that the rotary motor 20 is started.

[0029] The sampling method of the present utility model includes that the power drive unit drives the rotary dual-channel sampling unit to rotate, samples granular fertilizer through the sampling member, and the fertilizer particle samples enter the comprehensive sample storage part and the hourly sample storage part in the automatic rotary storage unit respectively under the action of their own gravity through the corresponding nested sampling inner tube 4 and nested sampling outer tube 5.

[0030] The present utility model also provides a sampling method for a granular fertilizer automatic sampling device, and the sampling method includes the following steps:

[0031] Step 1: The granular fertilizer finished product belt conveyor 1 operates normally and conveys granular fertilizer to the subsequent process section;

[0032] Step 2: When it reaches the sampling time, the rotary motor 20 is started, and drives the nested sampling inner tube 4 and the nested sampling outer tube 5 sleeved outside the nested sampling inner tube 4 to rotate through the transmission device. During the rotation of the nested sampling inner tube 4 and the nested sampling outer tube 5, the first sampling tube 6 and the second sampling tube 7 are driven to rotate, and the fertilizer on the top of the granular fertilizer finished product belt conveyor 1 is sampled;

[0033] Step 3: After the first sampling tube 6 and the second sampling tube 7 rotate and sample, they continue to rotate driven by the nested sampling inner tube 4, so that the fertilizer particle samples in the first sampling tube 6 and the second sampling tube 7 enter the corresponding sampling tubes under the action of their own gravity, that is: the fertilizer particle samples in the first sampling tube 6 enter the nested sampling inner tube 4, and the fertilizer particle samples in the second sampling tube 7 enter the nested sampling outer tube 5;

[0034] Step 4: Under the premise that the fertilizer particle samples in the nested sampling inner tube 4 enter the comprehensive sample circulation pipeline 15 under their own gravity and the rotation dual-channel sampling unit is inclined, and enter the comprehensive sample bottle 13 through the comprehensive sample circulation pipeline 15; the fertilizer particle samples in the nested sampling outer tube 5 enter the hourly sample circulation pipeline 16 under their own gravity and the rotation dual-channel sampling unit is inclined, and enter the corresponding lower hourly sample bottle 14 through the hourly sample circulation pipeline 16;

[0035] Step 5: The processes of the above steps 1-4 are repeated every 10-15 minutes. When it runs for 1-1.5 hours, the entire hourly cycle operation ends. At this time, the sample storage rotating motor 12 is started, and the rotating shaft 11 drives the rotating disk 10 to rotate, so that the next hourly sample bottle 14 is at the bottom of the hourly sample circulation pipeline 16; the fertilizer particle samples in the nested sampling inner tube 4 after the above rotation still enter the comprehensive sample bottle 13 through the comprehensive sample circulation pipeline 15; the fertilizer particle samples in the nested sampling outer tube 5 enter the corresponding lower hourly sample bottle 14 after the rotation of the rotating disk 10 through the hourly sample circulation pipeline 16;

[0036] Step 6: After the operation of step 5 ends, repeat the above steps 1-5. After the shift team ends, open the sealing cover 9, take out the comprehensive sample bottle 13 and several hourly sample bottles 14; and place the new comprehensive sample bottle 13 and several hourly sample bottles 14 in the corresponding grooves of the foam filling layer 21, and finally cover the sealing cover 9; just repeat the above operation.

[0037] The structural setting of the present utility model includes a rotation dual-channel sampling unit that can realize separate sampling of hourly samples and comprehensive samples, and send them into the corresponding storage parts through their respective corresponding channels. Further, based on the sampling characteristics of granular fertilizer samples, an automatic rotation storage unit is set up, which can conveniently store hourly samples and comprehensive samples automatically. That is: the present utility model changes the way of manually separating hourly samples and comprehensive samples and manually storing the above-mentioned fertilizer sample particles in the traditional technology, and designs the corresponding structure around the gravity of the granular fertilizer samples themselves and the sampling characteristics of the granular fertilizer samples, so as to achieve the characteristics of automatic sampling, reducing labor intensity, ensuring sampling time, improving sampling accuracy and avoiding sampling deviation.

[0038] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. An automatic sampling device for granular fertilizer, comprising a granular fertilizer finished product belt conveyor (1), characterized in that: The top of the granular fertilizer finished product belt conveyor (1) is provided with a rotating dual-channel sampling unit for taking hourly samples and comprehensive samples, and the rotating dual-channel sampling unit is connected to an automatic rotating storage unit for storing hourly samples and comprehensive samples; The rotating dual-channel sampling unit is tilted, a power driving unit is arranged on the upper part of the rotating dual-channel sampling unit, and an automatic rotating storage unit is arranged on the lower part of the rotating dual-channel sampling unit.

2. The automatic sampling device for granular fertilizer according to claim 1, characterized in that: The rotating dual-channel sampling unit comprises a bracket (2) arranged outside of both sides of the granular fertilizer finished product belt conveyor (1), the top of the bracket (2) is respectively provided with a bearing seat (3), and the bearing seat (3) is provided with a rotating dual-channel sampling part; The rotating dual-channel sampling part comprises a sleeve-type structure that rotates coaxially to move the sample granular fertilizer toward the lower part of the rotating dual-channel sampling unit according to its own gravity, and sampling parts arranged on the sleeve-type structure and corresponding to the dual channels respectively.

3. The automatic sampling device for granular fertilizer according to claim 2, characterized in that: The sleeve-type structural member comprises a nested sampling inner tube (4) and a nested sampling outer tube (5) sleeved on the outside of the nested sampling inner tube (4); the front part of the nested sampling inner tube (4) is sleeved in the corresponding bearing seat (3); the top part of the nested sampling inner tube (4) is connected to the power drive unit; the end of the nested sampling inner tube (4) is connected to the comprehensive sample storage part inside the automatic rotation storage unit; The nested sampling outer tube (5) is arranged at the middle and rear part of the nested sampling inner tube (4), the middle part of the nested sampling outer tube (5) is sleeved in the corresponding bearing seat (3), and the end of the nested sampling outer tube (5) is connected to the hourly sample storage part inside the automatic rotating storage unit.

4. The automatic sampling device for granular fertilizer according to claim 3, characterized in that: The sampling part comprises a first sampling tube (6) for taking a comprehensive sample and a second sampling tube (7) for taking an hourly sample. The first sampling tube (6) is connected to the middle of the nested sampling inner tube (4), and the second sampling tube (7) is connected to the front of the nested sampling outer tube (5).

5. The automatic sampling device for granular fertilizer according to claim 3, characterized in that: The automatic rotating storage unit comprises a sample storage sealed chamber (8) and a comprehensive sample storage part and an hourly sample storage part arranged in the sample storage sealed chamber (8); a sealing cover (9) is arranged on the top of the sample storage sealed chamber (8); a sample circulation member is arranged on the sealing cover (9); a rotating disk (10) is arranged on the inner bottom of the sample storage sealed chamber (8); the bottom of the rotating disk (10) is connected to a rotating shaft (11); the rotating shaft (11) passes through the storage sealed chamber (8) and is connected to the power output end of a sample storage rotating motor (12) arranged at the bottom of the storage sealed chamber (8).

6. The automatic sampling device for granular fertilizer according to claim 5, characterized in that: The comprehensive sample storage unit includes a comprehensive sample bottle (13) arranged in the middle of the rotating disk (10), and the hourly sample storage unit includes hourly sample bottles (14) arranged around the comprehensive sample bottle (13); The sample circulation component comprises a comprehensive sample circulation pipeline (15) and an hourly sample circulation pipeline (16); the upper parts of the comprehensive sample circulation pipeline (15) and the hourly sample circulation pipeline (16) are funnel-shaped structures; the comprehensive sample bottle (13) is arranged at the lower part of the comprehensive sample circulation pipeline (15); and the hourly sample bottle (14) is arranged at a corresponding position of the lower part of the hourly sample circulation pipeline (16).

7. The automatic sampling device for granular fertilizer according to claim 6, characterized in that: A sampling tube side wall (17) of an integral structure is provided on the outer circumference of the rotating disk (10), and a foam filling layer (21) is provided between the sampling tube side wall (17) and the hour sample bottle (14) and the comprehensive sample bottle (13); A sealed cavity support (18) is provided around the bottom of the sample storage sealed cavity (8); The end of the nested sampling inner tube (4) is connected to the integrated sample circulation pipeline (15), and the end of the nested sampling outer tube (5) is connected to the hourly sample circulation pipeline (16).

8. The automatic sampling device for granular fertilizer according to claim 3, characterized in that: A rotating motor bracket (19) is provided on the outer side of the bracket (2) corresponding to the upper part of the rotating dual-channel sampling unit, and a rotating motor (20) is provided on the rotating motor bracket (19). The rotating motor (20) is connected to the top of the nested sampling inner tube (4) through a transmission device.

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