A stratified sampling device for surface soil of building sites and its control method

Abstract

This invention relates to a stratified soil sampling device and its control method for construction sites, comprising: a vibrating screen, a screw conveyor, a tracked chassis, a storage turntable, and a transmission rod; the vibrating screen is supported on the tracked chassis, with its top connected to the bottom of the screw conveyor; the screw conveyor has an upper support frame and a lower support frame at its bottom, with a linear push rod connected to the upper support frame, and the screw conveyor is connected to the tracked chassis via the linear push rod and the lower support frame; a bucket is rotatably connected to the front end of the screw conveyor, and a brushless DC motor is fixed to the end of the screw conveyor, with a screw rod rotatably connected inside the screw conveyor via the brushless DC motor; the storage turntable is supported inside the tracked chassis. The beneficial effects of this invention are: it enables automatic stratified sampling and sample preparation of disturbed soil in construction sites, reducing human interference in the sampling process; the screw rod and vibrating screen work together to make the screened soil purer, improving the accuracy of the sampling data.

Description

Technical Field

[0001] This invention belongs to the field of building construction, and in particular relates to a device for stratified sampling of surface soil for building sites and its control method. Background Technology

[0002] Existing soil stratification sampling techniques for disturbed construction sites mainly rely on traditional manual sampling using a Luoyang shovel. Luoyang shovel sampling primarily uses tools such as shovels, trays, and burlap sacks. First, the topsoil is removed, and then soil is collected in layers. After the soil is collected, samples are taken according to the specifications of the geotechnical test. The entire process is inefficient and requires tedious repetitive actions. There are many uncontrollable factors, making it difficult to trace the stress state of the soil before and after disturbance, as well as the stress path that led to this state. The consistency of soil samples is difficult to guarantee.

[0003] Based on the above problems, there is an urgent need for an efficient and low-cost stratified sampling device for disturbed soil in building sites, in order to overcome the bottlenecks in efficiency, accuracy and adaptability of traditional technologies. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a surface soil stratification sampling device and its control method for building sites.

[0005] This surface soil stratification sampling device for construction sites includes: a vibrating screen, a screw conveyor, a tracked chassis, a storage turntable, and a transmission mechanism. The vibrating screen is supported on the tracked chassis, with a feed inlet at the top and a discharge outlet at the bottom of the screw conveyor, which is connected to the feed inlet. The screw conveyor has an upper support frame and a lower support frame at its bottom, with a linear push rod connected to the upper support frame. The screw conveyor is connected to the tracked chassis via the linear push rod and the lower support frame. The transmission mechanism includes a transmission rod, a bucket rotatably connected to the front end of the screw conveyor, and a brushless DC motor fixed to the end of the screw conveyor. The bucket and the brushless DC motor are connected via the transmission rod. A screw rod is rotatably connected to the inside of the screw conveyor via the brushless DC motor. A vision module is located at the top of the screw conveyor.

[0006] The storage turntable is supported inside the tracked chassis; the storage turntable includes a storage bin and a support plate. The storage bin is placed on the support plate, and the vibrating screen has a discharge port at the bottom, with the storage bin located below the discharge port.

[0007] Preferably, the transmission mechanism includes a main gear, a driven gear, a chain, and a bevel gear; the auger is connected to the rotor of a brushless DC motor; the end of the auger is provided with a main gear, the transmission rod is provided with a driven gear, and the main gear and the driven gear are connected by a chain; the bucket has a rotating shaft running through it, and the bucket is rotatably connected to the screw conveyor through the rotating shaft; the transmission rod is connected to the bevel gear, the rotating shaft is connected to the bevel gear, and the rotating shaft and the transmission rod are connected by the bevel gear.

[0008] Preferably, a bearing is provided between the brushless DC motor and the main gear; the transmission rod is located on the outside of the screw conveyor, and the transmission rod and the outside of the screw conveyor are connected by a connector, and a bearing is provided between the connector and the driven gear.

[0009] Preferably, a vibrating motor is fixed to the outside of the vibrating screen; the vibrating screen is supported on the tracked chassis by a support frame, and a series shock absorber is connected between the vibrating screen and the support frame.

[0010] Preferably, the vibrating screen has a screen box inside, and an inclined screen is installed inside the screen box; the side wall of the screen box has an opening, which is aligned with the bottom of the screen.

[0011] Preferably, the storage bin has a bottle mouth and a bottle body; the bottle body below the bottle mouth has a vortex groove structure, and a spring connects the vortex groove structure and the bottle body.

[0012] Preferably, the storage turntable also includes a gimbal, the bottom of which is supported inside the tracked chassis, and the top of which is rotatably connected to the material support plate.

[0013] The control method for this surface soil stratification sampling device for building sites includes the following steps:

[0014] Step 1: Power on the device. The vision module acquires environmental images and identifies areas with low stone density as sampling points. The control board inside the tracked chassis drives the tracked chassis to the sampling points.

[0015] Step 2: After arriving at the sampling point, adjust the extension of the linear push rod, so that the bucket is in contact with the ground surface and rotates. Control the tracked chassis to move forward, and at the same time control the screw rod in the screw conveyor to rotate forward. The soil enters the vibrating screen and is stored in the storage bin.

[0016] Step 3: After the storage bins collect soil to the preset value, control the storage turntable to rotate so that the next storage bin is aligned with the discharge port;

[0017] Step 4: After controlling the screw to reverse and discharge the soil from the screw conveyor, adjust the linear push rod to retract, and repeat steps 2 and 3.

[0018] Step 5: After sampling is completed, all motors stop, the storage turntable is reset, and the samples are ready for recovery.

[0019] Preferably, in step two, after the linear push rod extends, the screw conveyor forms an angle with the ground. When the screw rod inside the screw conveyor rotates, it performs a preliminary screening of the soil. The screw rod then sends the pre-screened soil to the discharge port at the bottom of the screw conveyor. The discharge port is connected to a vibrating screen, which vibrates to screen the soil again. The storage bin is located inside the tracked chassis, and the storage bin below the discharge port of the vibrating screen collects the screened soil.

[0020] Preferably, in step three, the storage bin has a bottle mouth and a bottle body; the bottle body below the bottle mouth has a vortex groove structure, and a spring connects the vortex groove structure and the bottle body; the middle of the vortex groove structure is V-shaped. When the soil falls to the top of the vortex groove structure, the spring contracts under the action of gravity, causing the vortex groove structure to separate to both sides. When the soil stops falling, the vortex groove structure automatically closes to the middle under the action of the spring.

[0021] The beneficial effects of this invention are:

[0022] 1) This invention addresses the sampling needs of disturbed soil in various construction sites by combining a rotary bucket, a screw conveyor mechanism, a cam-type vibrating screen mechanism, and a storage turntable module to achieve automatic stratified sampling and sample preparation of disturbed soil in construction sites, thereby reducing human interference in the soil sampling process.

[0023] 2) As the screw of this invention rotates, the screw conveyor and the ground form an inclination angle. Under the influence of gravity, stones slide down, and the screw achieves initial screening of the soil, reducing the number of stones in the soil that enter the vibrating screen through the discharge port at the end of the screw conveyor. The vibrating screen performs secondary screening of the soil. The screw and the vibrating screen work together to make the screened soil purer and improve the accuracy of the sampling data. At the same time, the screw rotates faster than the bucket, preventing the bucket from conveying too much soil to the screw and avoiding soil accumulation in the screw conveyor, which could cause the screw to jam and overload the brushless DC motor.

[0024] 3) The screw conveyor of the present invention has a rear-mounted brushless DC motor. The center of gravity of the brushless DC motor and the screw conveyor are on the same straight line, which makes the screw conveyor more stable. At the same time, the brushless DC motor controls the screw rod and the bucket simultaneously. There are fewer power output components, the cost is low and it is easier to control. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure;

[0026] Figure 2 This is a schematic diagram of a screw conveyor.

[0027] Figure 3 This is a perspective view of a screw conveyor;

[0028] Figure 4 This is a structural diagram of a vibrating screen and a storage turntable;

[0029] Figure 5 This is a cross-sectional view of a vibrating screen;

[0030] Figure 6 This is a schematic diagram of the material storage turntable;

[0031] Figure 7This is a structural diagram of the storage silo;

[0032] Figure 8 This is a schematic diagram of the bucket structure;

[0033] Figure 9 It is a control flow diagram.

[0034] Explanation of reference numerals in the attached drawings: 1. Vibrating motor; 2. Vibrating screen; 3. Articulated hose; 4. Brushless DC motor; 5. Linear push rod; 6. Screw conveyor; 7. Tracked chassis; 8. Drive rod; 9. Bucket; 11. Discharge port; 12. Upper support frame; 14. Lower support frame; 20. Bearing; 21. Chain; 22. Screw rod; 23. Bevel gear; 24. Rotating shaft; 25. Main gear; 26. Driven gear; 10. Storage turntable; 30. Feed port; 31. Series shock absorber; 32. Screen box; 33. Screen mesh; 34. Waste port; 40. Storage bin; 41. Material support plate; 42. Gimbal; 50. Bottle mouth; 51. Vortex groove structure; 52. Spring; 53. Bottle body; 60. Bucket teeth. Detailed Implementation

[0035] The present invention will be further described below with reference to embodiments. The description of the embodiments below is only for the purpose of helping to understand the present invention. It should be noted that those skilled in the art can make several modifications to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0036] Example 1

[0037] As one embodiment, a topsoil stratification sampling device for building sites is proposed, such as... Figure 1-8As shown, the system includes: a vibrating screen 2, a screw conveyor 6, a tracked chassis 7, a storage turntable 10, and a transmission mechanism. The vibrating screen 2 is supported on the tracked chassis 7. The top of the vibrating screen 2 has a feed inlet 30, and the bottom of the screw conveyor 6 has a discharge outlet 11. The discharge outlet 11 and the feed inlet 30 are connected by a hinged hose 3, allowing the screw conveyor 6 to rotate up and down. The bottom of the screw conveyor 6 has an upper support frame 12 and a lower support frame 14. The upper support frame 12 is connected to a linear push rod 5, which is equipped with a motor. The lower support frame 14 is located at the bottom center of the screw conveyor 6 and connected to the tracked chassis 7. The upper support frame 12 is located slightly above the bottom of the screw conveyor 6 and connected to the linear push rod 5. The linear push rod 5 drives the screw conveyor 6 to rotate up and down around the central axis of the lower support frame 14. The inclination angle of the screw conveyor 6 is set between 30 and 45 degrees. The screw conveyor 6 is connected to the tracked chassis 7 via the linear push rod 5 and the lower support frame 14. The chassis 7 is connected; the transmission mechanism includes a transmission rod 8, a bucket 9 is rotatably connected to the front end of the screw conveyor 6, and a brushless DC motor 4 is fixed to the end of the screw conveyor 6. The bucket 9 and the brushless DC motor 4 are connected through the transmission rod 8; a screw rod 22 is rotatably connected to the screw conveyor 6 through the brushless DC motor 4; a vision module is provided on the top of the screw conveyor 6; the storage turntable 10 is supported in the tracked chassis 7; the storage turntable 10 includes a storage bin 40 and a support plate 41. The storage bin 40 is placed on the support plate 41, and the bottom of the vibrating screen 2 is provided with a discharge port. The storage bin 40 is located below the discharge port; the leading edge serration angle of the bucket teeth 60 of the bucket 9 is 45°, and the longitudinal spacing of the bucket teeth 60 is 15 mm, which facilitates more efficient soil sampling; the surface soil stratification sampling device for building sites realizes automatic sampling and sample preparation through the integrated screw conveyor 6 and storage turntable 10, reducing the interference of human factors on the sampling process of disturbed soil.

[0038] like Figure 3 As shown, the transmission mechanism includes a main gear 25, a driven gear 26, a chain 21, and a bevel gear 23; the screw rod 22 is connected to the rotor of the brushless DC motor 4; the end of the screw rod 22 is provided with a main gear 25, and the transmission rod 8 is provided with a driven gear 26, the main gear 25 and the driven gear 26 are connected by a chain 21; the transmission ratio of the main gear 25 and the driven gear 26 is 5:1; the bucket 9 has a rotating shaft 24 passing through it, and the bucket 9 is rotatably connected to the screw conveyor 6 through the rotating shaft 24; the transmission rod 8 is connected to the bevel gear 23, and the rotating shaft 24 is connected to the bevel gear 24. 3. The rotating shaft 24 and the transmission rod 8 are connected by a bevel gear 23; the auger 22 and the bucket 9 cooperate with each other, and the transmission speed ratio is fixed to prevent the bucket 9 from conveying too much soil to the auger 22. Soil accumulation in the auger conveyor 6 will cause the auger 22 to jam, which will eventually lead to overload of the brushless DC motor 4. The centers of gravity of the brushless DC motor 4 and the auger conveyor 6 are on the same straight line, making the auger conveyor 6 more stable. At the same time, the brushless DC motor 4 controls both the auger 22 and the bucket 9. There are fewer power output components, the cost is lower, and it is easier to control.

[0039] like Figure 3 As shown, a bearing 20 is provided between the brushless DC motor 4 and the main gear 25; the transmission rod 8 is located on the outside of the screw conveyor 6, and the transmission rod 8 and the outside of the screw conveyor 6 are connected by a connector. A bearing 20 is provided between the connector and the driven gear 26. The bearing 20 is a thrust ball bearing. The bearing 20 is used to prevent the driven gear 26 from directly contacting the connector on the left side and the driven gear 26 from directly contacting the brushless DC motor 4 on the left side.

[0040] Example 2

[0041] As another embodiment, this second embodiment proposes a more specific surface soil stratification sampling device for building sites, based on the first embodiment.

[0042] like Figure 4 As shown, two vibrating motors 1 are fixed on the outside of the vibrating screen 2; the excitation force of the vibrating motor 1 is set to 130N and the frequency is set to 7200rpm; the vibrating motors 1 are set on opposite sides to improve the stability and excitation force of the vibrating screen 2; the vibrating screen 2 is supported on the tracked chassis 7 by a support frame, and four series shock absorbers 31 are connected between the vibrating screen 2 and the support frame. The stiffness coefficient of the series shock absorber 31 is 35kN / m and the damping ratio is 0.25; the series shock absorbers 31 are used to prevent the vibration generated by the vibrating motor 1 from being transmitted to the tracked chassis 7 and to maintain the stability of the tracked chassis 7.

[0043] like Figure 5 As shown, the vibrating screen 2 has a screen box 32 inside, and an inclined screen 33 is provided inside the screen box 32. The screen 33 has a hole diameter of 5 mm and an inclination angle of 15 degrees. The side wall of the screen box 32 has an opening, which is a waste port 34. The opening is aligned with the bottom of the screen 33. The waste port 34 is used to discharge impurities from the screen box 32 under the influence of gravity when the vibrating motor 1 vibrates the vibrating screen 2.

[0044] like Figure 6 and Figure 7 As shown, the storage bin 40 is provided with a bottle mouth 50 and a bottle body 53; a vortex groove structure 51 is provided in the bottle body 53 below the bottle mouth 50, and a spring 52 is connected between the vortex groove structure 51 and the bottle body 53; when the soil falls to the top of the vortex groove structure 51, because the middle of the vortex groove structure 51 is V-shaped, the spring 52 contracts under the action of gravity, causing the vortex groove structure 51 to separate to both sides. When the soil stops falling, the vortex groove structure 51 closes to the middle under the action of the spring 52, realizing automatic opening and closing, and preventing soil from spilling into the track chassis 7; the storage turntable 10 also includes a gimbal 42, the bottom of the gimbal 42 is supported in the track chassis 7, the top of the gimbal 42 is rotatably connected to the material support plate 41, and the gimbal 42 is connected to a gimbal motor for rotating the material support plate 41.

[0045] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 1 can be referred to each other, and will not be repeated in this application.

[0046] Example 3

[0047] As another embodiment, this third embodiment, based on the second embodiment, proposes a control method for a surface soil stratification sampling device for building sites, such as... Figure 1-9 As shown, it includes the following steps:

[0048] Step 1: Power on. The vision module acquires environmental images and identifies areas with low stone density as sampling points. Specifically, a control board (STM32 control board) is installed inside the tracked chassis 7. The control board controls the vibration motor 1, brushless DC motor 4, linear actuator 5, tracks of the tracked chassis 7, and gimbal motor of the gimbal 42. The vision module includes a camera (Cam_K230). The camera starts and acquires environmental images. Based on the YOLOv5 deep learning model, it identifies stones and obtains their coordinates in the camera. Based on the coordinates of the stones in the camera, the position and angle of the camera relative to the vehicle and the ground, the distance and direction of the stones relative to the camera are obtained through monocular ranging. Based on the geometric shape and physical properties of the stones, a geometric constraint model is established. Features in the image are extracted using the YOLOv5 deep learning model, and these features are fused with the information from the geometric constraint model. Combining the fusion features of the geometric constraint model and deep learning, the vertical projected area of ​​the stones is calculated and estimated.

[0049] Step 2: Upon reaching the sampling point, adjust the linear push rod 5 to extend, the bucket 9 to contact the ground surface and rotate, control the tracked chassis 7 to move forward, and simultaneously control the auger 22 to rotate clockwise; specifically, the camera transmits the obstacle coordinates to the control board in real time, and the control board controls A... The algorithm generates path instructions, driving the tracked chassis 7 to avoid obstacles and travel to the sampling point;

[0050] Furthermore, in traditional A Based on the algorithm, a dynamic weight adjustment mechanism is introduced to adjust A in real time according to the current driving status of the tracked chassis 7, the distribution of obstacles, and the location of soil sampling points. The weight parameters in the heuristic function of the algorithm are as follows: when the tracked chassis 7 is close to an area with dense obstacles, the weight related to the distance to the obstacles is increased, making the path more inclined to move away from the obstacles; when the tracked chassis 7 is close to the soil sampling point, the weight related to the distance to the target point is increased, which speeds up the convergence to the sampling point.

[0051] Furthermore, the cubic Bézier curve is compared with the improved A... By combining algorithms, the control points of the Bézier curves are optimized during global path generation to make the path smoother, reduce its tortuosity and the number of turns of the tracked chassis 7, thereby improving driving efficiency and stability, while ensuring that the path avoids identified rock obstacles; a dynamic weight adjustment mechanism is introduced, and a new A algorithm based on cubic Bézier curves is incorporated. The algorithm completes path planning; through the visual recognition module and A... The algorithm enables autonomous navigation and obstacle avoidance, making the stratified sampling of disturbed soil in building sites intelligent.

[0052] Upon reaching the sampling point, the vision module, in conjunction with the control panel, determines whether there is soil available for sampling in the current direction. If not, the tracked chassis 7 rotates 45 degrees and fine-tunes its position again until there is soil available for sampling in the current direction.

[0053] The control panel controls the linear push rod 5 to extend 72mm, adjusts the inclination angle of the screw conveyor 6 to 30°, the track moves forward at a speed of 0.5m / s, and the bucket cuts the soil at a speed of 200rpm;

[0054] Step 3: After the storage bin 40 collects soil to the preset value, control the storage turntable 10 to rotate so that the next storage bin 40 is aligned with the discharge port.

[0055] Step 4: After controlling the screw rod 22 to reverse and discharge the soil from the screw conveyor 6, adjust the linear push rod 5 to retract, and repeat steps 2 and 3.

[0056] Step 5: After sampling is completed, all motors stop, the storage turntable 10 is reset, and the samples are ready for recovery.

[0057] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 2 can be referred to each other, and will not be repeated in this application.

[0058] Example 4

[0059] As another embodiment, this fourth embodiment, based on the third embodiment, proposes a more specific control method for a surface soil stratification sampling device for building sites, such as... Figure 1-9 As shown, it includes the following steps:

[0060] Step 1: Power on the device. The vision module will acquire environmental images and identify areas with low stone density as sampling points.

[0061] Step 2: Upon reaching the sampling point, adjust the linear push rod 5 to extend, the bucket 9 to contact the ground surface and rotate, control the tracked chassis 7 to move forward, and simultaneously control the screw rod 22 to rotate forward. After the linear push rod 5 extends, the screw conveyor 6 forms an angle with the ground, with the angle range set to 30-45 degrees. When the screw rod 22 inside the screw conveyor 6 rotates, stones slide down under the influence of gravity. The screw rod achieves initial screening of the soil, reducing the number of stones in the soil that enter the vibrating screen through the discharge port at the end of the screw conveyor. The screw rod 22 sends the initially screened soil to the discharge port 11 at the bottom of the end of the screw conveyor 6. The discharge port 11 is connected to the vibrating screen 2, which vibrates and screens the soil again. The storage bin 40 is located inside the tracked chassis 7, and the storage bin 40 below the discharge port of the vibrating screen 2 collects the screened soil. The screw rod and the vibrating screen work together to make the screened soil purer and improve the accuracy of the sampling data.

[0062] Step 3: After the storage bin 40 collects soil to the preset value, control the storage turntable 10 to rotate so that the next storage bin 40 is aligned with the discharge port. Specifically, the storage bin 40 is equipped with a pressure sensor. After the pressure sensor of the storage bin 40 detects a mass of 100g, it sends a signal to the control board. The control board controls the gimbal motor to rotate 72° to switch the work position so that the next empty storage bin 40 is aligned with the discharge port.

[0063] Step 4: After controlling the screw rod 22 to reverse and discharge the soil from the screw conveyor 6, adjust the linear push rod 5 to retract, and repeat steps 2 and 3; specifically, reverse the screw conveyor for 5 seconds to clean the residual soil in the screw conveyor 6 to ensure no mixing between layers; after the tracked chassis turns, complete the sampling at depths of 60mm and 100mm in sequence, with an advance of 150mm per layer; repeat steps 2 and 3 until the storage bin 40 is fully loaded;

[0064] Step 5: After sampling is completed, all motors stop, the storage turntable 10 is reset, and the samples are ready for recovery.

[0065] It should be noted that the parts in this embodiment that are the same as or similar to those in Embodiment 3 can be referred to each other, and will not be repeated in this application.

[0066] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A control method for a surface soil stratification sampling device for building sites, characterized in that, The surface soil stratification sampling device for building sites includes: a vibrating screen, a screw conveyor, a tracked chassis, a storage turntable, and a transmission mechanism. The vibrating screen is supported on the tracked chassis, with a feed inlet at the top and a discharge outlet at the bottom of the screw conveyor, which is connected to the feed inlet. The screw conveyor has an upper support frame and a lower support frame at its bottom, with a linear push rod connected to the upper support frame. The screw conveyor is connected to the tracked chassis via the linear push rod and the lower support frame. The transmission mechanism includes a transmission rod, a bucket rotatably connected to the front end of the screw conveyor, and a brushless DC motor fixed to the end of the screw conveyor. The bucket and the brushless DC motor are connected via the transmission rod. A screw rod is rotatably connected to the inside of the screw conveyor via the brushless DC motor. A vision module is located at the top of the screw conveyor. The storage turntable is supported inside the tracked chassis; the storage turntable includes a storage bin and a support plate, the storage bin is placed on the support plate, the vibrating screen has a discharge port at the bottom, and the storage bin is located below the discharge port. The control method for this surface soil stratification sampling device for building sites includes the following steps: Step 1: Power on. The vision module acquires environmental images and identifies areas with low stone density as sampling points. A control board is installed inside the tracked chassis. The control board controls the vibration motor, brushless DC motor, linear actuator, tracks of the tracked chassis, and gimbal motor of the gimbal. The vision module includes a camera. The camera starts and acquires environmental images. Based on the YOLOv5 deep learning model, it identifies stones and obtains their coordinates in the camera. Based on the coordinates of the stones in the camera, the position and angle of the camera relative to the vehicle and the entire ground, the distance and direction of the stones relative to the camera are obtained through monocular ranging. Based on the geometric shape and physical properties of the stones, a geometric constraint model is established. Features in the image are extracted using the YOLOv5 deep learning model, and these features are fused with the information from the geometric constraint model. Combining the fusion features of the geometric constraint model and deep learning, the vertical projected area of ​​the stones is calculated and estimated. The control board inside the tracked chassis drives the tracked chassis to the sampling point. Step 2: After arriving at the sampling point, adjust the extension of the linear push rod, so that the bucket is in contact with the ground surface and rotates. Control the crawler chassis to move forward, and at the same time control the screw rod in the screw conveyor to rotate forward. The soil enters the vibrating screen and is stored in the storage bin. Step 3: After the storage bins collect soil to the preset value, control the storage turntable to rotate so that the next storage bin is aligned with the discharge port; Step 4: After controlling the screw to reverse and discharge the soil from the screw conveyor, adjust the linear push rod to retract, and repeat steps 2 and 3. Step 5: After sampling is completed, all motors stop, the storage turntable is reset, and the samples are ready for recovery.

2. The control method for the surface soil stratification sampling device for building sites according to claim 1, characterized in that, The transmission mechanism includes a main gear, a driven gear, a chain, and a bevel gear; the auger is connected to the rotor of a brushless DC motor; the end of the auger is equipped with a main gear, the transmission rod is equipped with a driven gear, and the main gear and the driven gear are connected by a chain; the bucket has a rotating shaft running through it, and the bucket is rotatably connected to the screw conveyor through the rotating shaft; the transmission rod is connected to the bevel gear, the rotating shaft is connected to the bevel gear, and the rotating shaft and the transmission rod are connected by the bevel gear.

3. The control method for the surface soil stratification sampling device for building sites according to claim 2, characterized in that, A bearing is provided between the brushless DC motor and the main gear; the transmission rod is located on the outside of the screw conveyor, and the transmission rod and the outside of the screw conveyor are connected by a connector, and a bearing is provided between the connector and the driven gear.

4. The control method for the surface soil stratification sampling device for building sites according to claim 1, characterized in that, A vibrating motor is fixed to the outside of the vibrating screen; the vibrating screen is supported on the tracked chassis by a support frame, and a series shock absorber is connected between the vibrating screen and the support frame.

5. The control method for the surface soil stratification sampling device for building sites according to claim 1, characterized in that, The vibrating screen has a screen box inside, which contains an inclined screen. The side wall of the screen box has an opening that is aligned with the bottom of the screen.

6. The control method for the surface soil stratification sampling device for building sites according to claim 1, characterized in that, The storage turntable also includes a gimbal, the bottom of which is supported inside the tracked chassis, and the top of which is rotatably connected to the material support plate.

7. The control method for the surface soil stratification sampling device for building sites according to claim 1, characterized in that, In step two, after the linear push rod extends, the screw conveyor forms an angle with the ground. When the screw rod inside the screw conveyor rotates, it performs a preliminary screening of the soil. The screw rod then sends the pre-screened soil to the discharge port at the bottom of the screw conveyor. The discharge port is connected to a vibrating screen, which vibrates to screen the soil again. The storage bin is located inside the tracked chassis, and the storage bin below the discharge port of the vibrating screen collects the screened soil.

8. The control method for the surface soil stratification sampling device for building sites according to claim 1, characterized in that, In step three, the storage bin has a bottle mouth and a bottle body; the bottle body below the bottle mouth has a vortex groove structure, and a spring connects the vortex groove structure and the bottle body; the middle of the vortex groove structure is V-shaped. When the soil falls to the top of the vortex groove structure, the spring contracts under the action of gravity, causing the vortex groove structure to separate to both sides. When the soil stops falling, the vortex groove structure automatically closes to the middle under the action of the spring.

Images