Garden soil sampling device

Abstract

The invention relates to the technical field of soil sampling devices, in particular to a garden soil sampling device which comprises a frame, a sampling barrel is fixed to the frame, a drill rod is movably connected to the sampling barrel in an inserted mode, a twist drill used for sampling is fixed to the bottom end of the drill rod, a sampling opening is formed in the sampling barrel, and the twist drill is located in the sampling barrel. A liftable movable frame is arranged on the frame, the top end of the drill rod is rotatably mounted on the movable frame, an air cylinder for driving the movable frame to lift is fixed on the frame, and a piston rod fixed with the movable frame is arranged at the output end of the air cylinder; the movable frame and the drill rod are matched through a linkage structure, the drill rod can be driven to descend synchronously in the descending process of the movable frame, soil can be sampled automatically, convenience and labor saving are achieved, meanwhile, the descending height of the drill rod is controllable, the sampling depth can be accurately controlled, and layered soil with the specific depth can be obtained; in addition, the twist drill can be always kept in the vertical direction during sampling, and the sampling precision can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of soil sampling devices, and specifically to a garden soil sampling device. Background Technique

[0002] Soil is the basic carrier for the growth of garden plants, and its physical and chemical properties (such as pH value, organic matter content, nutrient level, heavy metal pollution degree, water content, compactness, etc.) directly affect the health, growth trend and landscape effect of plants. Therefore, regularly and standardly sampling and detecting garden soil is a key prerequisite for scientifically guiding maintenance management work such as fertilization, irrigation, soil improvement, pest control and ecological restoration.

[0003] Currently, when conducting soil sampling in the field of landscaping, there are significant technical limitations and operational inconveniences, making it difficult to meet the requirements of efficient, precise and convenient on-site garden sampling. For example, the existing hand-held drill sampling requires a lot of physical effort when digging to a certain depth, has a slow sampling speed, is difficult to meet the needs of large-area or frequent sampling, is difficult to accurately control the sampling depth and obtain undisturbed soil at a specific depth, the sample is easily contaminated by surface impurities, and the phenomenon of mixed soil layers is serious, resulting in distorted test results, and it is almost impossible to achieve precise and undisturbed stratified sampling. In addition, in garden soil that is compact, dry, or contains a lot of gravel and roots, the hand-held drill equipment has a huge resistance when rotating and pressing down, the operator is extremely prone to fatigue, and when encountering hard objects or uneven resistance, the drill rod is easily bent or deviated from the vertical direction, affecting the sampling accuracy. The operation handle is not reasonably designed and the force application method is not good, which is likely to cause discomfort or strain to the operator's hand after long-term use.

[0004] The landscaping industry urgently needs a new type of soil sampling device that is portable, labor-saving, easy to operate, accurately sampled, depth controllable, clearly stratified, can effectively maintain the integrity of the soil core, and causes little damage to the site. Therefore, we provide a garden soil sampling device to solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a garden soil sampling device to solve the problems in the existing hand-held drill sampling mentioned in the above background technique, that is, it requires a lot of physical effort when digging to a certain depth, has a slow sampling speed, is difficult to meet the needs of large-area or frequent sampling, is difficult to accurately control the sampling depth and obtain undisturbed soil at a specific depth, and in addition, the hand-held drill equipment has a huge resistance when rotating and pressing down, the operator is extremely prone to fatigue, and when encountering hard objects or uneven resistance, the drill rod is easily bent or deviated from the vertical direction, affecting the sampling accuracy.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: A garden soil sampling device comprises a vehicle frame, a sampling barrel fixed on the vehicle frame, a drill rod movably connected to the sampling barrel, an auger for sampling fixed to the bottom end of the drill rod, a sampling port provided on the sampling barrel, the auger located inside the sampling barrel, a movable frame that can be raised and lowered is provided on the vehicle frame, the top end of the drill rod is rotatably mounted on the movable frame, a cylinder for driving the movable frame to rise and fall is fixed on the vehicle frame, and a piston rod fixed to the movable frame is provided at the output end of the cylinder; The movable frame and the drill rod are coordinated through a linkage structure. When the movable frame descends, the drill rod will be driven to descend synchronously, and the drill rod will rotate when it continues to descend after descending a certain distance. When the movable frame rises, the drill rod will be driven to rise synchronously, and the drill rod will not rotate during the rising process.

[0007] A garden soil sampling device as described above: a plurality of wheels for shifting the position of the frame are rotatably mounted on the bottom of the frame.

[0008] In the garden soil sampling device as described above, the outer diameter of the auger is adapted to the inner diameter of the sampling barrel, and the auger is movably clamped in the interior of the sampling barrel.

[0009] The garden soil sampling device as described above: the linkage structure includes a first and a second V-shaped frame fixed on the movable frame, the first and the second V-shaped frames being slidably clamped on the vehicle frame through a limiting assembly, the drill rod being rotatably mounted on the second V-shaped frame, a gear ring and a turntable being rotatably provided on the first V-shaped frame, the gear ring being sleeved on the outer circumference of the turntable, a fixed rod penetrating the movable frame and the first V-shaped frame being fixed on the frame, a fixed ring movably sleeved on the fixed rod being fixed at the center of the turntable, the fixed ring and the fixed rod being matched through a first transmission mechanism, the fixed ring will drive the fixed ring to rotate when it slides downward on the fixed rod for a distance and then continues to slide downward, the turntable and the gear ring are matched through a unidirectional transmission of a second transmission mechanism, the turntable and the gear ring are matched through a unidirectional transmission of a second transmission mechanism, the turntable will drive the gear ring to rotate counterclockwise when the turntable rotates counterclockwise, and will not drive the gear ring to rotate when the turntable rotates clockwise, the second V-shaped frame is rotatably provided with a gear fixed to the drill rod, the gear being meshed with the gear ring.

[0010] A garden soil sampling device as described above: the limiting component includes a guide rail groove fixed on the frame and a slide plate fixed on the first U-shaped frame and the second U-shaped frame, and the slide plate is movably connected to the inside of the guide rail groove.

[0011] A garden soil sampling device as described above: The first transmission mechanism includes a track groove formed on the surface of the fixed rod and a ball embedded and clamped on the inner wall of the fixed ring. The ball is movably clamped inside the track groove and can roll along the track groove. The track groove is composed of a straight track groove and a spiral track groove that are interconnected from top to bottom.

[0012] A garden soil sampling device as described above: The second transmission mechanism includes tooth grooves circumferentially arranged at equal angles on the inner wall of the gear ring. A tooth is hinged on the turntable. The tooth is movably clamped inside the tooth groove, and a spring flap fixed on the turntable abuts against one side surface of the tooth.

[0013] A garden soil sampling device as described above: A first annular clamping block is fixed at the bottom of the gear ring. A first annular clamping groove is formed on the first C-shaped frame. The first annular clamping block is movably clamped inside the first annular clamping groove.

[0014] A garden soil sampling device as described above: A second annular clamping block is fixed at the bottom of the turntable. A second annular clamping groove is formed on the first C-shaped frame. The second annular clamping block is movably clamped inside the second annular clamping groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: When in use, the vehicle frame is moved above the ground where soil sampling is to be carried out. The cylinder is started to drive the piston rod to expand and contract, which can drive the movable frame to rise and fall. The top of the drill rod is rotatably installed on the movable frame. Therefore, driving the movable frame to rise and fall can drive the drill rod to rise and fall. The movable frame and the drill rod are matched through a linkage structure. During the process of the movable frame descending, the drill rod will be driven to descend synchronously. And after the drill rod descends a certain distance and then continues to descend, it will rotate automatically. And during the process of the movable frame ascending, the drill rod will be driven to ascend synchronously, and the drill rod will not rotate during the ascending process of the drill rod. Thus, when sampling with the present invention, by driving the drill rod to automatically descend, the spiral drill can be automatically lowered above the land where soil is to be taken first. Then, when the drill rod continues to move downward into the soil, it will rotate automatically, thereby driving the spiral drill to rotate. The spiral drill rotates and screws into the soil, and at the same time, the spiral drill is used to perform spiral excavation sampling on the soil. After the soil sampling is completed, the cylinder is started to drive the piston rod to expand and contract to drive the drill rod to rise. Since the drill rod does not rotate during the rising process of the drill rod, it can drive the spiral drill after soil sampling to be lifted upward into the sampling cylinder. Finally, the sampled soil is taken out through the sampling port. Therefore, the present invention can perform automatic soil sampling without manual participation, which is convenient, labor-saving, and reduces the labor intensity. At the same time, the descending height of the drill rod is controllable. Therefore, the depth of soil sampling by the spiral drill is controllable, and the sampling depth can be accurately controlled and stratified soil at a specific depth can be obtained. In addition, the spiral drill can always maintain a vertical direction during sampling, which can effectively improve the sampling accuracy. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of a garden soil sampling device; Figure 2 It is a Figure 1 Schematic diagram of a partially decomposed structure of a garden soil sampling device; Figure 3 It is a Figure 2 Schematic diagram of a partially decomposed structure of a garden soil sampling device; Figure 4 It is a Figure 3 Schematic diagram of the structure from another perspective of a garden soil sampling device; Figure 5 It is a Figure 3 Schematic diagram of a partially exploded structure of a garden soil sampling device; Figure 6 It is a Figure 3 Top view schematic diagram of a garden soil sampling device; Figure 7 It is a Figure 3 Schematic diagram of a partially decomposed structure of a garden soil sampling device; Figure 8 It is a schematic diagram of the structure of the turntable and the fixed rod of a garden soil sampling device installed in cooperation; Figure 9 It is a Figure 8 Schematic diagram of the structure from another perspective of a garden soil sampling device; Figure 10 It is a schematic diagram of a partial sectional view structure of a garden soil sampling device.

[0017] In the figure: 1, vehicle frame; 2, sampling cylinder; 3, auger; 4, drill pipe; 5, movable frame; 6, first C-shaped frame; 7, second C-shaped frame; 9, cylinder; 10, piston rod; 11, gear; 12, gear ring; 13, turntable; 14, tooth groove; 15, tooth; 16, spring flap; 17, fixed ring; 18, fixed rod; 19, track groove; 20, ball; 21, first annular block; 22, first annular groove; 23, second annular block; 24, second annular groove; 25, guide rail groove; 26, slide plate; 27, sampling port; 28, wheel. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0019] Please refer to Figures 1 to 10, as an embodiment of the present invention, a garden soil sampling device includes a vehicle frame 1, a sampling cylinder 2 is fixed on the vehicle frame 1, a drill rod 4 is movably inserted on the sampling cylinder 2, a spiral drill 3 for sampling is fixed at the bottom end of the drill rod 4, a sampling port 27 is provided on the sampling cylinder 2, the spiral drill 3 is located inside the sampling cylinder 2, a movable frame 5 that can be lifted and lowered is arranged on the vehicle frame 1, the top end of the drill rod 4 is rotatably installed on the movable frame 5, a cylinder 9 for driving the lifting and lowering of the movable frame 5 is fixed on the vehicle frame 1, and a piston rod 10 fixed to the movable frame 5 is arranged at the output end of the cylinder 9; The movable frame 5 and the drill rod 4 are cooperated through a linkage structure. During the process of the movable frame 5 descending, it will drive the drill rod 4 to descend synchronously, and when the drill rod 4 continues to descend after descending a certain distance, it will rotate automatically. And during the process of the movable frame 5 ascending, it will drive the drill rod 4 to ascend synchronously, and the drill rod 4 will not rotate during the ascending process of the drill rod 4.

[0020] In this embodiment, during use, the vehicle frame 1 is moved above the ground where soil sampling is to be performed. The cylinder 9 is electrically connected to an external power source through a wire. Starting the cylinder 9 to drive the piston rod 10 to extend and retract can drive the movable frame 5 to lift and lower. Since the top end of the drill rod 4 is rotatably installed on the movable frame 5, driving the movable frame 5 to lift and lower can drive the drill rod 4 to lift and lower. The movable frame 5 and the drill rod 4 are cooperated through a linkage structure. During the process of the movable frame 5 descending, it will drive the drill rod 4 to descend synchronously, and when the drill rod 4 continues to descend after descending a certain distance, it will rotate automatically. And during the process of the movable frame 5 ascending, it will drive the drill rod 4 to ascend synchronously, and the drill rod 4 will not rotate during the ascending process of the drill rod 4. Thus, during sampling of the present invention, by driving the drill rod 4 to automatically descend, the spiral drill 3 can be automatically lowered above the land where soil is to be sampled first. Then, when the drill rod 4 continues to move downward into the soil, it will rotate automatically and then drive the spiral drill 3 to rotate. The spiral drill 3 rotates and advances into the soil, and at the same time, the spiral drill 3 is used to perform spiral excavation sampling on the soil. After the soil sampling is completed, starting the cylinder 9 to drive the piston rod 10 to extend and retract drives the drill rod 4 to ascend. The drill rod 4 does not rotate during the ascending process of the drill rod 4, so it can drive the spiral drill 3 after soil sampling to be lifted upward into the sampling cylinder 2. Finally, the sampled soil can be taken out through the sampling port 27 provided on the sampling cylinder 2.

[0021] As a further solution of the present invention, a plurality of wheels 28 for transferring the position of the vehicle frame 1 are rotatably installed at the bottom of the vehicle frame 1.

[0022] In this embodiment, a plurality of wheels 28 are rotatably installed at the bottom of the vehicle frame 1, which is convenient for transferring the vehicle frame 1 to different locations for soil sampling, increases the convenience during the transfer of the device, and meets the needs of large-area or frequent sampling in the garden.

[0023] As a further solution of the present invention, the maximum outer diameter dimension of the spiral drill 3 is adapted to the inner diameter dimension of the sampling cylinder 2, and the spiral drill 3 is movably clamped inside the sampling cylinder 2.

[0024] In this embodiment, the auger 3 is movably connected to the inside of the sampling tube 2 so that the auger 3 can be raised and lowered in the sampling tube 2. After sampling, the auger 3 is lifted into the inside of the sampling tube 2. The sampling tube 2 can reduce the soil sampled by the auger 3 from falling from the auger 3 during the lifting process of the auger 3.

[0025] As a further solution of the present invention, the linkage structure includes a first 匚-shaped frame 6 and a second 匚-shaped frame 7 fixed on the movable frame 5, the first 匚-shaped frame 6 and the second 匚-shaped frame 7 are slidably connected to the vehicle frame 1 through a limit assembly, the drill rod 4 is rotatably mounted on the second 匚-shaped frame 7, and a gear ring 12 and a turntable 13 are rotatably provided on the first 匚-shaped frame 6. The gear ring 12 is sleeved on the outer periphery of the turntable 13, and a fixed rod 18 is fixed on the vehicle frame 1 that passes through the movable frame 5 and the first 匚-shaped frame 6. A fixed rod 18 that is movable and sleeved on the fixed rod 18 is fixed at the center of the turntable 13. Ring 17, the fixed ring 17 and the fixed rod 18 are matched through the first transmission mechanism. After the fixed ring 17 slides down a distance on the fixed rod 18 and then continues to slide down, it will drive the fixed ring 17 to rotate on its own. The turntable 13 and the ring gear 12 are matched through the one-way transmission of the second transmission mechanism. When the turntable 13 rotates counterclockwise, it will drive the ring gear 12 to rotate counterclockwise. When the turntable 13 rotates clockwise, it will not drive the ring gear 12 to rotate. A gear 11 fixed to the drill rod 4 is rotatably provided on the second frame 7, and the gear 11 is engaged with the ring gear 12.

[0026] In this embodiment, the starting cylinder 9 drives the piston rod 10 to expand and contract, which can drive the movable frame 5 to rise and fall. When the movable frame 5 rises and falls, it will drive the first C-shaped frame 6 and the second C-shaped frame 7 to rise and fall synchronously. When the movable frame 5 descends, it will drive the drill pipe 4 and the auger 3 at the bottom of the drill pipe 4 to descend. When the movable frame 5 descends, it will drive the fixed ring 17 at the center of the turntable 13 to slide downward on the fixed rod 18. After the fixed ring 17 slides downward on the fixed rod 18 for a certain distance and then continues to slide downward, it will drive the fixed ring 17 fixed on the turntable 13 to rotate. Therefore, when the turntable 13 descends for a certain distance and then continues to move downward, it will rotate counterclockwise. When the turntable 13 rotates counterclockwise, it will drive the gear ring 12 to rotate counterclockwise. The gear ring 12 rotates counterclockwise and drives the gear 11 to rotate counterclockwise by engaging the gear 11 with the gear ring 12, thereby driving the drill pipe 4 and the auger 3 at the bottom of the drill pipe 4 to rotate counterclockwise. That is, when the movable frame 5 descends, after descending a certain distance and then continuing to descend, it will drive the auger 3 to rotate counterclockwise. That is, first, the auger 3 is moved downward to the ground, and when the auger 3 continues to move downward and drill into the ground, it will rotate simultaneously to perform spiral sampling on the soil. In addition, when the movable frame 5 rises, it will drive the fixed ring 17 to slide upward on the fixed rod 18. That is, the fixed ring 17 fixed on the turntable 13 and the turntable 13 will first rotate clockwise and move upward for a certain distance and then continue to move upward for a certain distance while remaining stationary. Since the turntable 13 does not drive the gear ring 12 to rotate when rotating clockwise, it will not drive the gear 11 to rotate. Therefore, when the movable frame 5 rises, it will drive the drill pipe 4 and the auger 3 at the bottom of the drill pipe 4 to move upward without rotation, and the sampled soil is lifted upward to the inner cavity of the sampling cylinder 2 by the upward movement of the auger 3.

[0027] As a further solution of the present invention, the limiting component includes a guide rail groove 25 fixed on the vehicle frame 1 and a sliding plate 26 fixed on the first C-shaped frame 6 and the second C-shaped frame 7. The sliding plate 26 is movably clamped inside the guide rail groove 25.

[0028] In this embodiment, by movably clamping the sliding plate 26 inside the guide rail groove 25, when the first C-shaped frame 6 and the second C-shaped frame 7 move up and down, the first C-shaped frame 6 and the second C-shaped frame 7 can be limited to ensure that their positions do not shift during movement, that is, to ensure the verticality of the drill pipe 4 and the auger 3 at the bottom of the drill pipe 4 during lifting and lowering.

[0029] As a further solution of the present invention, the first transmission mechanism includes a track groove 19 opened on the surface of the fixed rod 18 and a ball 20 embedded and clamped on the inner wall of the fixed ring 17. The ball 20 is movably clamped inside the track groove 19 and can roll along the track groove 19. The track groove 19 is composed of a straight track groove and a spiral track groove that are interconnected from top to bottom.

[0030] In this embodiment, the track groove 19 is composed of a straight track groove and a spiral track groove that are interconnected from top to bottom. The ball 20 is movably clamped inside the track groove 19 and can roll along the track groove 19. Therefore, when the ball 20 rolls in the straight track groove, the fixed ring 17 can only move up and down without self-rotation, while when the ball 20 rolls in the spiral track groove, the fixed ring 17 will rotate simultaneously while moving up and down.

[0031] As a further solution of the present invention, the second transmission mechanism includes tooth grooves 14 that are circumferentially arranged at equal angles on the inner wall of the gear ring 12. A tooth 15 is hinged on the turntable 13, and the tooth 15 is movably clamped inside the tooth groove 14. A spring flap 16 fixed on the turntable 13 abuts against one side surface of the tooth 15.

[0032] In this embodiment, when the turntable 13 rotates counterclockwise, the tooth 15 is clamped inside the tooth groove 14, and the counterclockwise rotation of the turntable 13 will drive the gear ring 12 to rotate counterclockwise. When the turntable 13 rotates clockwise, the tooth 15 will be deflected against the elastic force of the spring flap 16 due to the extrusion of the tooth groove 14, so it will not drive the gear ring 12 to rotate clockwise.

[0033] As a further solution of the present invention, a first annular clamping block 21 is fixed at the bottom of the gear ring 12, a first annular clamping groove 22 is formed on the first C-shaped frame 6, and the first annular clamping block 21 is movably clamped inside the first annular clamping groove 22.

[0034] In this embodiment, by movably clamping the first annular clamping block 21 inside the first annular clamping groove 22, the gear ring 12 can be movably clamped on the first C-shaped frame 6 and can rotate on the first C-shaped frame 6.

[0035] As a further solution of the present invention, a second annular clamping block 23 is fixed at the bottom of the turntable 13, a second annular clamping groove 24 is formed on the first C-shaped frame 6, and the second annular clamping block 23 is movably clamped inside the second annular clamping groove 24.

[0036] In this embodiment, by movably clamping the second annular clamping block 23 inside the second annular clamping groove 24, the turntable 13 can be movably clamped on the first C-shaped frame 6 and can rotate on the first C-shaped frame 6.

[0037] The working principle of this invention is as follows: When in use, first move the vehicle frame 1 above the ground where soil sampling is to be carried out. Electrically connect the cylinder 9 to an external power supply through a wire. Start the cylinder 9 to drive the piston rod 10 to expand and contract, which can drive the movable frame 5 to rise and fall. The top of the drill pipe 4 is rotatably installed on the movable frame 5, so it can drive the drill pipe 4 to rise and fall. The movable frame 5 and the drill pipe 4 are cooperated through a linkage structure. First, drive the movable frame 5 to descend. During the descent of the movable frame 5, it will drive the drill pipe 4 to descend synchronously. And when the drill pipe 4 continues to descend after descending a certain distance, it will rotate. Also, during the ascent of the movable frame 5, it will drive the drill pipe 4 to rise synchronously, and the drill pipe 4 will not rotate during the ascent of the drill pipe 4. Thus, when sampling, by driving the drill pipe 4 to automatically descend, the auger 3 can be automatically lowered above the land where soil is to be taken. Then, when the drill pipe 4 continues to move downward into the soil, it will rotate, thereby driving the auger 3 to rotate. The auger 3 rotates and advances into the soil while using the auger 3 to perform spiral excavation and sampling of the soil. After the soil sampling is completed, start the cylinder 9 to drive the piston rod 10 to expand and contract to drive the drill pipe 4 to rise. The drill pipe 4 will not rotate during the ascent, so it can drive the auger 3 after soil sampling upward into the inner cavity of the sampling cylinder 2. The user can layer out the sampled soil through the sampling port 27 opened on the sampling cylinder 2.

[0038] The above embodiments are exemplary and not restrictive. Therefore, without departing from the spirit or basic characteristics of the present invention, all technical solutions that can implement the present invention in other specific forms are included in the present invention.

Claims

1. A garden soil sampling device, comprising a vehicle frame (1), characterized in that, A sampling cylinder (2) is fixed on the vehicle frame (1). A drill pipe (4) is movably inserted into the sampling cylinder (2). A screw drill (3) for sampling is fixed at the bottom end of the drill pipe (4). A sampling port (27) is formed in the sampling cylinder (2). The screw drill (3) is located inside the sampling cylinder (2). A movable frame (5) capable of lifting is arranged on the vehicle frame (1). The top end of the drill pipe (4) is rotatably installed on the movable frame (5). An air cylinder (9) for driving the lifting of the movable frame (5) is fixed on the vehicle frame (1). A piston rod (10) fixed to the movable frame (5) is arranged at the output end of the air cylinder (9). The movable frame (5) and the drill pipe (4) are cooperated through a linkage structure. During the process of the movable frame (5) descending, it will drive the drill pipe (4) to descend synchronously. And when the drill pipe (4) continues to descend after descending a certain distance, the drill pipe (4) will rotate. Also, during the process of the movable frame (5) ascending, it will drive the drill pipe (4) to ascend synchronously, and the drill pipe (4) will not rotate during the ascending process of the drill pipe (4).

2. The garden soil sampling device according to claim 1, wherein, A plurality of wheels (28) for transferring the position of the vehicle frame (1) are rotatably installed at the bottom of the vehicle frame (1).

3. The garden soil sampling device according to claim 1, characterized in that, The outer diameter size of the screw drill (3) is adapted to the inner diameter size of the sampling cylinder (2). The screw drill (3) is movably clamped inside the sampling cylinder (2).

4. The garden soil sampling device according to claim 1, characterized in that, The linkage structure includes a first C-shaped frame (6) and a second C-shaped frame (7) fixed on the movable frame (5). The first C-shaped frame (6) and the second C-shaped frame (7) are slidably clamped on the vehicle frame (1) through a limiting component. The drill pipe (4) is rotatably installed on the second C-shaped frame (7). A gear ring (12) and a turntable (13) are rotatably arranged on the first C-shaped frame (6). The gear ring (12) is sleeved on the outer periphery of the turntable (13). A fixing rod (18) penetrating through the movable frame (5) and the first C-shaped frame (6) is fixed on the vehicle frame (1). A fixing ring (17) movably sleeved on the fixing rod (18) is fixed at the center of the turntable (13). The fixing ring (17) and the fixing rod (18) are cooperated through a first transmission mechanism. After the fixing ring (17) slides downward a certain distance on the fixing rod (18) and then continues to slide downward, it will drive the fixing ring (17) to rotate. The turntable (13) and the gear ring (12) are unidirectionally driven and cooperated through a second transmission mechanism. When the turntable (13) rotates counterclockwise, it will drive the gear ring (12) to rotate counterclockwise. When the turntable (13) rotates clockwise, it will not drive the gear ring (12) to rotate. A gear (11) fixed to the drill pipe (4) is rotatably arranged on the second C-shaped frame (7). The gear (11) meshes with the gear ring (12).

5. The garden soil sampling device according to claim 4, characterized in that, The limiting component includes a guide rail groove (25) fixed on the vehicle frame (1) and a sliding plate (26) fixed on the first C-shaped frame (6) and the second C-shaped frame (7). The sliding plate (26) is movably clamped inside the guide rail groove (25).

6. The garden soil sampling device according to claim 4, wherein The first transmission mechanism includes an orbital groove (19) formed on the surface of the fixed rod (18) and balls (20) embedded and clamped on the inner wall of the fixed ring (17). The balls (20) are movably clamped inside the orbital groove (19) and can roll along the orbital groove (19). The orbital groove (19) is composed of a straight orbital groove and a spiral orbital groove that are interconnected from top to bottom.

7. A garden soil sampling device according to claim 4, characterized in that, The second transmission mechanism includes tooth grooves (14) opened at equal angles in the circumferential direction on the inner wall of the gear ring (12). A tooth (15) is hinged on the turntable (13). The tooth (15) is movably clamped inside the tooth groove (14). A spring flap (16) fixed on the turntable (13) abuts against one side surface of the tooth (15).

8. The garden soil sampling device according to claim 4, characterized in that, A first annular clamping block (21) is fixed at the bottom of the gear ring (12). A first annular clamping groove (22) is formed on the first C-shaped frame (6). The first annular clamping block (21) is movably clamped inside the first annular clamping groove (22).

9. The garden soil sampling device according to claim 4, wherein, A second annular clamping block (23) is fixed at the bottom of the turntable (13). A second annular clamping groove (24) is formed on the first C-shaped frame (6). The second annular clamping block (23) is movably clamped inside the second annular clamping groove (24).

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