A soil temperature and humidity detector for a ground source heat pump system

By designing a soil temperature and humidity detector with a rotating cylinder, driven pulley and telescopic square column, the problem that the existing technology cannot deeply detect deeper soil and can only obtain single-point data is solved, and a wider and higher-quality soil temperature and humidity detection is achieved.

CN119880058BActive Publication Date: 2025-06-10CHINA RAILWAY 16TH BUREAU GRP ROAD & BRIDGE ENG CO LTD +2
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Patent Information

Application Number
CN202510360643.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-03-26
Publication Date
2025-06-10
Estimated Expiration
2045-03-26

AI Technical Summary

Technical Problem

Existing soil temperature and humidity detectors cannot detect deeper soil in depth, and can only obtain single-point data, which reduces the detection range and quality.

Method used

A detector including a rotating cylinder, driven pulley, a fixing frame, a fixed cylinder, a telescopic square column and a detection cylinder is designed. Through the cooperation of the rotating mechanism and the driving mechanism, the detection cylinder can rotate and penetrate deep into the soil, realizing multi-point depth temperature and humidity detection.

Benefits of technology

The scope and quality of soil temperature and humidity detection are greatly improved, and the temperature and humidity data of soils at different depths can be quickly and accurately obtained, and non-destructive testing is achieved through the soil discharge mechanism to avoid the need for later filling.

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Abstract

The present invention relates to the technical field of soil detection, and discloses a soil temperature and humidity detector for a ground source heat pump system. A rotating cylinder is rotatably installed at the outer position of the bottom of the detection box. A driven belt pulley is fixedly installed at the bottom of the rotating cylinder. Fixing frames are symmetrically and fixedly installed at the bottom of the driven belt pulley. A fixing cylinder is fixedly installed between the bottoms of the fixing frames. A telescopic square column is slidably installed inside the fixing cylinder through a fixing groove. A detection cylinder is arranged at the bottom of the telescopic square column. A detection mechanism is arranged inside the detection cylinder. A screwing-in mechanism for driving the telescopic detection cylinder to move is arranged on the driven belt pulley. A driving mechanism for driving the rotating mechanism to work is also arranged inside the detection box; a soil discharging mechanism is further included. The present invention can more quickly detect the temperature and humidity of the soil environment where the ground source heat pump system is located, greatly improving the detection range and detection quality; it can detect the temperature and humidity at different depth positions of the soil collected inside the detection cylinder, further improving the soil detection accuracy.
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Description

Technical Field

[0001] The present invention relates to the technical field of soil detection, and particularly relates to a soil temperature and humidity detector for a ground source heat pump system. Background Art

[0002] Soil temperature and humidity refer to the temperature and humidity in the soil below the ground surface, mainly referring to the temperature and humidity in the shallow layer below the ground surface directly related to the growth and development of plants. Soil temperature and humidity affect the growth, development of plants and the formation of soil. All kinds of biochemical processes in the soil, such as the biochemical processes caused by microbial activities and non-living chemical processes, are affected by soil temperature and humidity. Therefore, soil temperature and humidity measurement has a wide range of applications in agriculture, forestry, geology, environment and other aspects.

[0003] At present, the soil temperature and humidity detector can only detect the soil at a relatively shallow depth, and cannot extend the detection probe into the soil at a relatively deep depth for detection. At the same time, only the temperature and humidity data at a certain position can be obtained during the detection, which greatly reduces the detection range and detection quality, and the practicability is poor. Therefore, further improvement is needed. Summary of the Invention

[0004] The purpose of the present invention is to provide a soil temperature and humidity detector for a ground source heat pump system to solve the problems mentioned in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A soil temperature and humidity detector for a ground source heat pump system includes a detection box. A rotary cylinder is rotatably installed at the outer position of the bottom of the detection box. A driven belt pulley is fixedly installed at the bottom of the rotary cylinder. Fixing frames are symmetrically and fixedly installed at the bottom of the driven belt pulley. A fixing cylinder is fixedly installed between the bottoms of the fixing frames. A telescopic square column is slidably installed in the fixing cylinder through a fixing groove. A detection cylinder is arranged at the bottom of the telescopic square column. A detection mechanism is arranged inside the detection cylinder. A screw-in mechanism for driving the telescopic detection cylinder to move is arranged on the driven belt pulley. A driving mechanism for driving the rotation mechanism to work is also arranged inside the detection box; a soil discharging mechanism is further included.

[0007] As an improved scheme of the present invention: The screw-in mechanism includes a rotating shaft rotatably installed inside the rotary cylinder. The outer side of the rotating shaft is connected with an internal thread hole arranged inside the telescopic square column through a threaded area. The screw-in mechanism further includes a self-rotation component.

[0008] As an improved scheme of the present invention: The self-rotation component includes locking cylinders symmetrically fixed at the bottom of the driven belt pulley. The locking cylinders are connected with locking columns through locking parts. The locking columns are symmetrically fixed at both sides of the upper end of the detection cylinder.

[0009] As an improved solution of the present invention: The locking part includes a locking groove arranged inside the locking cylinder and a locking strip fixed on the locking column, and the locking strip is slidably arranged inside the locking groove.

[0010] As an improved solution of the present invention: The driving mechanism includes a driving shaft rotatably installed inside the detection box. The end of the driving shaft is connected to the upper end of the rotating shaft through a gear set a. The driving shaft is also connected with a transmission shaft rotatably arranged on the detection box through a gear set b. A driving pulley is fixedly installed at the bottom of the transmission shaft, and the outside of the driving pulley is connected to a driven pulley through a belt. A detection motor is also installed on the outer wall of the detection box, and the output end of the detection motor is connected to the driving shaft.

[0011] As an improved solution of the present invention: The detection mechanism includes a soil storage cylinder fixed inside the detection cylinder. A plurality of detection grooves are evenly arranged on the side wall of the soil storage cylinder. A detection shaft is rotatably installed in the upper and lower regions between the outer wall of the soil storage cylinder and the inner wall of the detection cylinder. A plurality of detection needles cooperating with the detection grooves are installed on the detection shaft. A temperature and humidity sensor is installed on the detection needle. The detection mechanism also includes a control component for changing the angle of the detection shaft.

[0012] As an improved solution of the present invention: The control component includes control seats symmetrically fixed at the outer wall position of the upper end of the detection cylinder. A control shaft is rotatably installed between the control seats. One end of the control shaft is fixedly installed with a control handle. A control worm gear is also arranged on the control shaft, and the control worm gear meshes with a control worm wheel fixed at the top of the detection shaft.

[0013] As an improved solution of the present invention: An output interface line is arranged inside the control shaft. One end of the output interface line is electrically connected to the temperature and humidity sensor, and the other end extends to the outside of the detection cylinder and is detachably electrically connected to an input interface line. The input interface line is electrically connected to a reading display screen fixed on the outer wall of the detection box.

[0014] As an improved solution of the present invention: A battery pack is installed inside the detection box, and armrest frames are symmetrically installed on the outer wall of the detection box.

[0015] As an improved solution of the present invention: The soil discharging mechanism includes a gas guiding ring fixed at the middle position of the upper end of the detection cylinder. The gas guiding ring is communicated with a gas guiding hole arranged at the upper end of the detection cylinder. A fixing plate is fixedly installed at the bottom of the telescopic square column. A gas guiding cylinder is installed on the fixing plate. The upper end of the gas guiding ring is rotatably arranged inside the gas guiding cylinder. A gas guiding pipe is communicated and installed on the outer wall of the gas guiding cylinder. The gas guiding pipe is communicated and cooperated with a gas pressure pump fixed on the detection box.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. Through the mutual cooperation of the precession mechanism and the driving mechanism, the detection cylinder can penetrate deep into the soil while rotating, thereby enabling more rapid detection of the temperature and humidity of the soil environment where the ground source heat pump system is located, greatly improving the detection range and detection quality;

[0018] 2. By arranging a soil storage cylinder inside the detection cylinder and with the cooperation of the detection mechanism, the temperature and humidity of different depth positions of the soil collected inside the detection cylinder can be detected, further improving the soil detection accuracy;

[0019] 3. Through the arranged soil discharge mechanism, the soil where the ground source heat pump system is located can be directly discharged within the original detection area after the temperature and humidity detection, achieving the purpose of non-destructive detection, avoiding the need for later soil filling, and having strong practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the overall front view structural schematic diagram of the present invention;

[0021] Figure 2 is the overall bottom view structural schematic diagram of the present invention;

[0022] Figure 3 is the structural schematic diagram of the driving mechanism in the present invention;

[0023] Figure 4 is the front view structural schematic diagram of the precession mechanism in the present invention;

[0024] Figure 5 is the bottom view structural schematic diagram of the precession mechanism in the present invention;

[0025] Figure 6 is the structural schematic diagram of the detection mechanism in the present invention;

[0026] Figure 7 is Figure 6 the partial enlarged structural schematic diagram of A in

[0027] Figure 8 is the sectional view structural schematic diagram of the detection cylinder in the present invention;

[0028] Figure 9 is Figure 8 the partial enlarged structural schematic diagram of B in

[0029] In the figure: 1. Detection box; 2. Handrail frame; 3. Reading display screen; 4. Input interface line; 5. Air pressure pump; 6. Air duct; 7. Detection cylinder; 8. Telescopic square column; 9. Fixed cylinder; 10. Fixed frame; 11. Threaded area; 12. Detection motor; 13. Rotating shaft; 14. Battery pack; 15. Driving shaft; 16. Gear set b; 17. Transmission shaft; 18. Driving pulley; 19. Belt; 20. Driven pulley; 21. Gear set a; 22. Fixed plate; 23. Locking cylinder; 24. Rotating cylinder; 25. Locking bar; 26. Locking column; 27. Locking groove; 28. Fixed groove; 29. Detection shaft; 30. Detection needle; 31. Temperature and humidity sensor; 32. Soil storage cylinder; 33. Output interface line; 34. Control worm gear; 35. Control seat; 36. Control worm teeth; 37. Control shaft; 38. Control handle; 39. Internal threaded hole; 40. Air guide hole; 41. Air guide ring; 42. Air guide cylinder; 43. Detection groove. Detailed implementation manner

[0030] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0033] The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0034] Example 1: Refer to Figures 1 to 9 In the embodiment of the present invention, a soil temperature and humidity detector for a ground source heat pump system includes a detection box 1. A rotating cylinder 24 is rotatably installed at the outer position of the bottom of the detection box 1. A driven pulley 20 is fixedly installed at the bottom of the rotating cylinder 24. Fixed frames 10 are symmetrically and fixedly installed at the bottom of the driven pulley 20. A fixed cylinder 9 is fixedly installed between the bottoms of the fixed frames 10. A telescopic square column 8 is slidably installed in the fixed cylinder 9 through a fixed groove 28. The cross-section of the telescopic square column 8 is a rectangular structure and is matched with the cross-section of the fixed groove 28. A detection cylinder 7 is arranged at the bottom of the telescopic square column 8. A detection mechanism is arranged inside the detection cylinder 7. A screw-in mechanism for driving the telescopic detection cylinder 7 to move is arranged on the driven pulley 20, so that the detection cylinder 7 continuously presses into the soil while rotating. A driving mechanism for driving the rotating mechanism to work is also arranged inside the detection box 1.

[0035] In one case of this embodiment, the screw-in mechanism includes a rotating shaft 13 rotatably installed inside the rotating cylinder 24. The outer side of the rotating shaft 13 is connected with an internal thread hole 39 arranged inside the telescopic square column 8 through a threaded area 11. The screw-in mechanism further includes a self-rotation component.

[0036] Among them, the self-rotation component includes locking cylinders 23 symmetrically fixed at the bottom of the driven pulley 20. The locking cylinders 23 are connected with locking columns 26 through locking parts. The locking columns 26 are symmetrically fixed at both sides of the upper end of the detection cylinder 7.

[0037] In addition, in order to ensure that the detection cylinder 7 does not affect its up and down movement while rotating, the locking part includes a locking groove 27 arranged inside the locking cylinder 23 and a locking strip 25 fixed on the locking column 26. The locking strip 25 is slidably arranged inside the locking groove 27.

[0038] The working principle of the above screw-in mechanism: During the self-rotation process of the driven pulley 20, it will drive the locking cylinder 23 to rotate synchronously along the axis position of the driven pulley 20. Then, with the cooperation of the locking part, the fixing plate 22 drives the entire detection cylinder 7 to rotate synchronously. During this process, the rotating shaft 13 also rotates. Then, with the screw fit of the threaded area 11 and the internal thread hole 39, the telescopic square column 8 moves linearly downward along the fixed groove 28 arranged on the fixed cylinder 9. Finally, the rotating detection cylinder 7 moves towards the soil interior direction at the same time, so as to better detect the soil temperature and humidity.

[0039] In addition, in order to effectively ensure the normal movement of the precession mechanism, the driving mechanism includes a driving shaft 15 rotatably installed inside the detection box 1. The end of the driving shaft 15 is connected to the upper end of the rotating shaft 13 through a gear set a 21. The driving shaft 15 is also connected with a transmission shaft 17 rotatably arranged on the detection box 1 through a gear set b 16. A driving pulley 18 is fixedly installed at the bottom of the transmission shaft 17. The outside of the driving pulley 18 is connected to a driven pulley 20 through a belt 19. A detection motor 12 is also installed on the outer wall of the detection box 1, and the output end of the detection motor 12 is connected to the driving shaft 15.

[0040] The detection motor 12 drives the driving shaft 15 to rotate. On the one hand, it drives the transmission shaft 17 to rotate under the action of the gear set b 16. Then, under the cooperation of the driving pulley 18 and the belt 19, the driven pulley 20 rotates synchronously, ultimately ensuring the dual precession movements of the rotation and linear motion of the detection cylinder 7.

[0041] In one case of this embodiment, the detection mechanism includes a soil storage cylinder 32 fixed inside the detection cylinder 7. A plurality of detection grooves 43 are uniformly arranged on the side wall of the soil storage cylinder 32. A detection shaft 29 is rotatably installed in the upper and lower regions between the outer wall of the soil storage cylinder 32 and the inner wall of the detection cylinder 7. A plurality of detection needles 30 that cooperate with the detection grooves 43 are installed on the detection shaft 29. A temperature and humidity sensor 31 is installed on the detection needle 30. The detection mechanism also includes a control component for changing the angle of the detection shaft 29.

[0042] Among them, the control component includes control seats 35 symmetrically fixed at the outer wall position of the upper end of the detection cylinder 7. A control shaft 37 is rotatably installed between the control seats 35. A control handle 38 is fixedly installed at one end of the control shaft 37. A control spiral tooth 36 is also arranged on the control shaft 37, and the control spiral tooth 36 meshes with a control worm gear 34 fixed at the top of the detection shaft 29.

[0043] After the detection cylinder 7 collects the soil, rotate the control handle 38, so that the control shaft 37 drives the control spiral tooth 36 to rotate. Then, it meshes with the control worm gear 34 to drive the detection shaft 29 to rotate. Then, the detection needle 30 drives the temperature and humidity sensor 31 to pass through the detection groove 43 and enter the soil inside the soil storage cylinder 32 to detect the temperature and humidity of the soil at different depths, so as to obtain the temperature and humidity of the soil at different depths where the ground source heat pump system is located. The whole operation process is fast and convenient, and is worthy of popularization and use.

[0044] In order to quickly read the temperature and humidity parameters obtained by the temperature and humidity sensor 31, in this embodiment, an output interface line 33 is provided inside the control shaft 37. One end of the output interface line 33 is electrically connected to the temperature and humidity sensor 31, and the other end extends to the outside of the detection cylinder 7 and is detachably and electrically connected to an input interface line 4. The input interface line 4 is electrically connected to the reading display screen 3 fixed on the outer wall of the detection box 1. After the temperature and humidity sensor 31 is controlled to enter the soil at the corresponding depth, the output interface line 33 is plugged into the input interface line 4, and then the temperature and humidity at the corresponding depth are obtained under the action of the reading display screen 3.

[0045] At the same time, a battery pack 14 is installed inside the detection box 1. The battery pack 14 is used to supply power to the electrical equipment involved inside the entire detector. Armrest frames 2 are symmetrically installed on the outer wall of the detection box 1 to facilitate the staff to perform detection operations on the entire detector.

[0046] Embodiment 2: In another embodiment of the present invention, the difference between this embodiment and the above embodiment is that, further, a soil discharging mechanism is included.

[0047] The soil discharging mechanism includes a gas guiding ring 41 fixed at the middle position of the upper end of the detection cylinder 7. The gas guiding ring 41 is in communication with a gas guiding hole 40 provided at the upper end of the detection cylinder 7. A fixing plate 22 is fixedly installed at the bottom of the telescopic square column 8. A gas guiding cylinder 42 is installed on the fixing plate 22. The upper end of the gas guiding ring 41 is rotatably arranged inside the gas guiding cylinder 42. A gas guiding pipe 6 is communicated and installed on the outer wall of the gas guiding cylinder 42. The gas guiding pipe 6 is in communication and cooperation with a gas pressure pump 5 fixed on the detection box 1.

[0048] After the detection is completed, the gas pressure pump 5 is started, and high-pressure gas is continuously input into the gas guiding cylinder 42 through the gas guiding pipe 6. Then, through the mutual cooperation between the gas guiding pipe 6 and the gas guiding hole 40, the high-pressure gas is introduced into the soil storage cylinder 32. Then, the previously sampled cylindrical soil is pressed downward under the action of the high-pressure gas, accelerating the separation action of the soil inside the soil storage cylinder 32.

[0049] To sum up, first, the staff inserts the detection cylinder 7 into the corresponding soil through the armrest frame 2, then starts the detection motor 12, and then makes the detection mechanism work under the action of the driving mechanism. Finally, the temperature and humidity of the soil at different depths in the corresponding area are obtained. After the detection is completed, the detection motor 12 is started in reverse, then the gas pressure pump 5 is started, and then under the action of the soil discharging mechanism, the previously sampled soil is discharged into the original sampling area, thus avoiding the need for manual filling and further ensuring the use quality of the detector.

[0050] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A soil temperature and humidity detector for a ground source heat pump system, comprising a detection box (1), characterized in that: A rotating cylinder (24) is rotatably mounted on the outer side of the bottom of the detection box (1), a driven pulley (20) is fixedly mounted on the bottom of the rotating cylinder (24), a fixed frame (10) is symmetrically fixedly mounted on the bottom of the driven pulley (20), a fixed cylinder (9) is fixedly mounted between the bottoms of the fixed frames (10), a telescopic square column (8) is slidably mounted inside the fixed cylinder (9) through a fixed groove (28), a detection cylinder (7) is arranged at the bottom of the telescopic square column (8), a detection mechanism is arranged inside the detection cylinder (7), a screwing mechanism for driving the detection cylinder (7) to move is arranged on the driven pulley (20), and a driving mechanism for driving the rotating mechanism to work is also arranged inside the detection box (1); The detection mechanism comprises a soil storage cylinder (32) fixed inside the detection cylinder (7), a plurality of detection grooves (43) being evenly arranged on the side wall of the soil storage cylinder (32), a detection shaft (29) being rotatably mounted in the upper and lower regions between the outer wall of the soil storage cylinder (32) and the inner wall of the detection cylinder (7), a plurality of detection needles (30) cooperating with the detection grooves (43) being mounted on the detection shaft (29), a temperature and humidity sensor (31) being mounted on the detection needles (30), and the detection mechanism further comprises a control component for changing the angle of the detection shaft (29); The control assembly comprises a control seat (35) symmetrically fixed to the outer wall of the upper end of the detection tube (7), a control shaft (37) is rotatably mounted between the control seats (35), a control handle (38) is fixedly mounted at one end of the control shaft (37), and a control worm gear (36) is also arranged on the control shaft (37), and the control worm gear (36) is meshed with a control worm wheel (34) fixed on the top of the detection shaft (29); It also includes a soil discharge mechanism.

2. The soil temperature and humidity detector for a ground source heat pump system according to claim 1, characterized in that: The screw-in mechanism comprises a rotating shaft (13) rotatably mounted inside a rotating cylinder (24); the outer side of the rotating shaft (13) is connected to an internal threaded hole (39) arranged inside a telescopic square column (8) via a threaded area (11); and the screw-in mechanism further comprises a self-rotating assembly.

3. The soil temperature and humidity detector for a ground source heat pump system according to claim 2, characterized in that: The self-rotating assembly comprises a locking cylinder (23) symmetrically fixed to the bottom of the driven pulley (20); the locking cylinder (23) is connected to a locking column (26) via a locking portion; the locking column (26) is symmetrically fixed to positions on both sides of the upper end of the detection cylinder (7).

4. The soil temperature and humidity detector for a ground source heat pump system according to claim 3, characterized in that: The locking portion comprises a locking groove (27) arranged inside the locking cylinder (23) and a locking strip (25) fixed on the locking column (26); the locking strip (25) is slidably arranged inside the locking groove (27).

5. The soil temperature and humidity detector for a ground source heat pump system according to claim 4, characterized in that: The driving mechanism comprises a driving shaft (15) rotatably mounted inside the detection box (1); the end of the driving shaft (15) is connected to the upper end of the rotating shaft (13) via a gear set a (21); the driving shaft (15) is also connected to a transmission shaft (17) rotatably mounted on the detection box (1) via a gear set b (16); a driving pulley (18) is fixedly mounted on the bottom of the transmission shaft (17); the outer side of the driving pulley (18) is connected to a driven pulley (20) via a belt (19); a detection motor (12) is also mounted on the outer wall of the detection box (1); the output end of the detection motor (12) is connected to the driving shaft (15).

6. The soil temperature and humidity detector for a ground source heat pump system according to claim 1, characterized in that: An output interface line (33) is provided inside the control shaft (37), one end of the output interface line (33) being electrically connected to the temperature and humidity sensor (31), and the other end of the output interface line (33) extending to the outside of the detection tube (7) and being detachably electrically connected to an input interface line (4), the input interface line (4) being electrically connected to a reading display screen (3) fixed to the outer wall of the detection box (1).

7. The soil temperature and humidity detector for a ground source heat pump system according to claim 1, characterized in that: A battery pack (14) is installed inside the detection box (1), and a handrail frame (2) is symmetrically installed on the outer wall of the detection box (1).

8. The soil temperature and humidity detector for a ground source heat pump system according to claim 1, characterized in that: The soil discharge mechanism comprises an air guide ring (41) fixed at the middle position of the upper end of the detection tube (7), the air guide ring (41) and the air guide hole (40) arranged at the upper end of the detection tube (7) are mutually communicated, a fixing plate (22) is fixedly installed at the bottom of the telescopic square column (8), an air guide tube (42) is installed on the fixing plate (22), the upper end of the air guide ring (41) is rotatably arranged inside the air guide tube (42), an air guide pipe (6) is connected and installed on the outer wall of the air guide tube (42), and the air guide pipe (6) is mutually communicated and coordinated with an air pump (5) fixed on the detection box (1).

Citation Information

Patent Citations

  • Sampling equipment suitable for soil detection

    CN117147216A