Building land surface soil stratified sampling device and control method thereof

Abstract

The invention relates to a building land surface soil stratified sampling device and a control method thereof. The building land surface soil stratified sampling device comprises a vibrating screen, a spiral conveyor, a crawler chassis, a storage turntable and a transmission rod, the top of the vibrating screen is connected with the bottom of the tail end of the spiral conveyor; an upper supporting frame and a lower supporting frame are arranged at the bottom of the spiral conveyor, the upper supporting frame is connected with a linear push rod, and the spiral conveyor is connected with the crawler chassis through the linear push rod and the lower supporting frame. The front end of the spiral conveyor is rotationally connected with a bucket, a brushless direct current motor is fixed at the tail end of the spiral conveyor, and a spiral rod is rotationally connected in the spiral conveyor through the brushless direct current motor; and the storage turntable is supported in the crawler chassis. The device has the beneficial effects that automatic stratified sampling and sample preparation of disturbed soil of construction land soil are realized, and the interference of human factors on the disturbed soil sampling process is reduced; the screw rod and the vibrating screen are matched with each other, so that the screened soil is purer, and the accuracy of sampling data is improved.

Description

Technical Field

[0001] The invention belongs to the field of building construction, and in particular relates to a layered sampling device for surface soil of construction land and a control method thereof. Background Art

[0002] The existing technology for stratified sampling of disturbed soil on construction land mainly relies on traditional manual sampling operations using a Luoyang shovel. Luoyang shovel sampling mainly relies on tools such as shovels, trays, and sacks. First, the topsoil is removed, and then the soil is taken in layers. After the soil is taken, sampling is carried out according to the regulations of the geotechnical test project. The whole process is inefficient and requires tedious repetitive actions. There are many uncontrollable factors, and it is difficult to trace the stress state of the soil before and after disturbance and the stress path to reach this state. As a result, the consistency of the soil samples is difficult to ensure.

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

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a device for sampling surface soil layers for construction sites and a control method thereof.

[0005] This device for sampling surface soil of construction land by layers includes: a vibrating screen, a screw conveyor, a crawler chassis, a storage turntable and a transmission mechanism; the vibrating screen is supported on the crawler chassis, a feed port is provided at the top of the vibrating screen, a discharge port is provided at the bottom of the end of the screw conveyor, and the discharge port and the feed port are connected; an upper support frame and a lower support frame are provided at the bottom of the screw conveyor, the upper support frame is connected to a linear push rod, and the screw conveyor is connected to the crawler chassis via the linear push rod and the lower support frame; the transmission mechanism includes a transmission rod, a bucket is rotatably connected to the front end of the screw conveyor, a brushless DC motor is fixed to the end of the screw conveyor, and the bucket and the brushless DC motor are connected via a transmission rod; a screw rod is rotatably connected inside the screw conveyor via the brushless DC motor; and a vision module is provided at the top of the screw conveyor. The storage turntable is supported in the crawler chassis; the storage turntable includes a storage bin and a supporting tray, the storage bin is placed on the supporting tray, a discharge port is provided at the bottom of the vibrating screen, and the storage bin is located below the discharge port.

[0006] Preferably, the transmission mechanism includes a main gear, a slave gear, a chain and a bevel gear; the screw rod is connected to the rotor of the brushless DC motor; a main gear is provided at the end of the screw rod, and the transmission rod is provided with a slave gear, and the main gear and the slave gear are connected by a chain; a rotating shaft passes through the bucket, 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 through the bevel gear.

[0007] Preferably, a bearing is provided between the brushless DC motor and the main gear; a transmission rod is provided on the outside of the screw conveyor, the transmission rod and the outside of the screw conveyor are connected by a connecting piece, and a bearing is provided between the connecting piece and the slave gear.

[0008] Preferably, a vibration motor is fixed on the outside of the vibrating screen; the vibrating screen is supported on the crawler chassis through a support frame, and a series shock absorber is connected between the vibrating screen and the support frame.

[0009] Preferably, the interior of the vibrating screen is a screen box, in which an inclined screen is provided; an opening is provided on a side wall of the screen box, and the opening is aligned with the bottom of the screen.

[0010] Preferably, the storage bin is provided with a bottle mouth and a bottle body; a vortex groove structure is provided in the bottle body below the bottle mouth, and a spring is connected between the vortex groove structure and the bottle body.

[0011] Preferably, the material storage turntable further comprises a platform, the bottom of which is supported in the crawler chassis, and the top of which is rotatably connected to the material supporting tray.

[0012] The control method of the surface soil layer sampling device for construction includes the following steps: Step 1: Turn on the power. The vision module collects environmental images and identifies areas with low stone density as sampling points. The control board in the crawler chassis drives the crawler chassis to the sampling point. Step 2: After arriving at the sampling point, adjust the linear push rod to extend, the bucket touches the ground surface and rotates, control the crawler chassis to move forward, and 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 bin collects soil to the preset value, the storage turntable is controlled to rotate and the next storage bin is aligned with the discharge port; Step 4: After controlling the screw rod to reverse and discharge the soil in the screw conveyor, adjust the linear push rod to retract it and repeat steps 2 and 3; Step 5: After the sampling is completed, all motors stop, the storage turntable resets, and waits for sample recovery.

[0013] Preferably, in step 2, after the linear push rod is extended, the screw conveyor and the ground form an inclination angle. When the screw rod in the screw conveyor rotates, the screw rod performs a preliminary screening of the soil. The screw rod sends the preliminarily screened soil to the discharge port at the bottom end of the screw conveyor. The discharge port is connected to the vibrating screen, and the vibrating screen vibrates to screen the soil again. The storage bin is arranged in the crawler chassis, and the storage bin below the vibrating screen discharge port collects the screened soil.

[0014] Preferably, in step three, the storage bin is provided with a bottle mouth and a bottle body; a vortex groove structure is provided in the bottle body below the bottle mouth, and a spring is connected between the vortex groove structure and the bottle body; the middle part of the vortex groove structure is V-shaped, and when the soil falls to the top of the vortex groove structure, the spring contracts under the action of gravity, driving the vortex groove structure to separate to both sides, and when the soil stops falling, the vortex groove structure automatically closes to the middle under the action of the spring.

[0015] The beneficial effects of the present invention are: 1) The present invention is aimed at the sampling needs of disturbed soil in various construction sites. It combines a rotary bucket, a spiral conveying mechanism, a cam-type vibrating screen mechanism and a storage turntable module to realize automatic stratified sampling and sample preparation of disturbed soil in construction sites, reducing the interference of human factors in the disturbed soil sampling process.

[0016] 2) When the screw rod of the present invention is rotating, the screw conveyor and the ground form an inclination angle, and the stones slide downward under the influence of gravity. The screw rod realizes the primary screening of the soil, reducing the stones in the soil from entering the vibrating screen through the discharge port at the end of the screw conveyor. The vibrating screen performs a secondary screening of the soil. The screw rod and the vibrating screen cooperate with each other to make the screened soil purer, thereby improving the accuracy of the sampling data. At the same time, the speed of the screw rod is faster than that of the bucket, which prevents the bucket from conveying too much soil to the screw rod, thereby preventing the soil from accumulating in the screw conveyor, causing the screw rod to get stuck and overloading the brushless DC motor.

[0017] 3) The screw conveyor of the present invention is equipped with a brushless DC motor at the rear, and the centers of gravity of the brushless DC motor and the screw conveyor are in the same straight line, making the screw conveyor more stable. At the same time, the brushless DC motor controls the screw rod and the bucket at the same time, resulting in fewer power output components, low cost and easier control. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure; Figure 2 It is a structural diagram of the screw conveyor; Figure 3 It is a perspective view of the screw conveyor; Figure 4 It is a structural diagram of the vibrating screen and the storage turntable; Figure 5 It is a cross-sectional view of the vibrating screen; Figure 6 It is a structural diagram of the storage turntable; Figure 7 It is a structural diagram of the storage silo; Figure 8 It is a schematic diagram of the structure of the bucket; Figure 9 It is a control flow graph.

[0019] Explanation of the accompanying drawings: vibration motor 1, vibrating screen 2, articulated hose 3, brushless DC motor 4, linear push rod 5, screw conveyor 6, crawler chassis 7, transmission rod 8, bucket 9, discharge port 11, upper support frame 12, lower support frame 14, bearing 20, chain 21, screw rod 22, bevel gear 23, rotating shaft 24, main gear 25, slave gear 26, storage turntable 10, feed port 30, tandem shock absorber 31, screen box 32, screen 33, waste port 34, storage bin 40, supporting tray 41, pan head 42, bottle mouth 50, vortex groove structure 51, spring 52, bottle body 53, bucket teeth 60. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the following examples. The following examples are provided only to facilitate understanding of the present invention. It should be noted that, without departing from the principles of the present invention, it is possible for a person skilled in the art to make various modifications to the present invention, and such improvements and modifications fall within the scope of the claims of the present invention.

[0021] Example 1 As an embodiment, a device for sampling the surface soil of a construction site is proposed, such as Figure 1-8As shown, it includes: a vibrating screen 2, a screw conveyor 6, a crawler chassis 7, a storage turntable 10 and a transmission mechanism; the vibrating screen 2 is supported on the crawler chassis 7, a feed port 30 is provided on the top of the vibrating screen 2, and a discharge port 11 is provided at the bottom of the end of the screw conveyor 6, and the discharge port 11 and the feed port 30 are connected by an articulated hose 3, so that the screw conveyor 6 can rotate up and down; an upper support frame 12 and a lower support frame 14 are provided at the bottom of the screw conveyor 6, the upper support frame 12 is connected to a linear push rod 5, the linear push rod 5 is provided with a motor, a lower support frame 14 is provided at the middle bottom of the screw conveyor 6 and is connected to the crawler chassis 7, an upper support frame 12 is provided above the bottom of the screw conveyor 6 and is connected to the linear push rod 5, the linear push rod 5 is used to drive the screw conveyor 6 to rotate up and down around the rotating shaft in the middle of the lower support frame 14, and the inclination range of the screw conveyor 6 is set to 30 degrees-45 degrees; the screw conveyor 6 is connected to the crawler chassis 7 through the linear push rod 5 and the lower support frame 14 The chassis 7 is connected; the transmission mechanism includes a transmission rod 8, the front end of the screw conveyor 6 is rotatably connected to the bucket 9, and the end of the screw conveyor 6 is fixed with a brushless DC motor 4, and the bucket 9 and the brushless DC motor 4 are connected through the transmission rod 8; the screw conveyor 6 is rotatably connected to the screw rod 22 through the brushless DC motor 4; a visual module is provided on the top of the screw conveyor 6; the storage turntable 10 is supported in the crawler chassis 7; the storage turntable 10 includes a storage bin 40 and a supporting tray 41, the storage bin 40 is placed on the supporting tray 41, and a discharge port is provided at the bottom of the vibrating screen 2, and the storage bin 40 is located below the discharge port; the front 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 construction land realizes automatic sampling and sample preparation through the integrated screw conveyor 6 and storage turntable 10, reducing the interference of human factors in the disturbed soil sampling process.

[0022] like Figure 3 As shown, the transmission mechanism includes a main gear 25, a slave 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, the transmission rod 8 is provided with a slave gear 26, and the main gear 25 and the slave gear 26 are connected by the chain 21; the transmission ratio of the main gear 25 and the slave gear 26 is 5:1; the bucket 9 is penetrated by a rotating shaft 24, 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 2 3, the rotating shaft 24 and the transmission rod 8 are connected by a bevel gear 23; the screw rod 22 and the bucket 9 cooperate with each other, and the transmission speed ratio is fixed to prevent the bucket 9 from transporting too much soil to the screw rod 22, which would cause the soil to accumulate in the screw conveyor 6 and cause the screw rod 22 to get stuck, eventually leading to an overload of the brushless DC motor 4; the centers of gravity of the brushless DC motor 4 and the screw conveyor 6 are in the same straight line, the screw conveyor 6 is more stable, and the brushless DC motor 4 controls the screw rod 22 and the bucket 9 at the same time, resulting in fewer power output components, lower cost and easier control.

[0023] 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 provided 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 connecting piece. A bearing 20 is provided between the connecting piece and the slave gear 26, and the bearing 20 is a thrust ball bearing. The bearing 20 is used to avoid direct contact between the slave gear 26 and the connecting piece on the left, and direct contact between the slave gear 26 and the brushless DC motor 4 on the left.

[0024] Example 2 As another embodiment, this embodiment 2 proposes a more specific device for sampling the surface soil of construction land on the basis of embodiment 1.

[0025] like Figure 4 As shown, two vibration motors 1 are fixed on the outside of the vibrating screen 2; the exciting force of the vibration motor 1 is set to 130N, and the frequency is set to 7200rpm; the vibration motor 1 is set on the opposite side to improve the stability and exciting force of the vibrating screen 2; the vibrating screen 2 is supported on the crawler chassis 7 through 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 absorber 31 is used to prevent the vibration generated by the vibration motor 1 from being transmitted to the crawler chassis 7, thereby maintaining the stability of the crawler chassis 7.

[0026] like Figure 5 As shown, the interior of the vibrating screen 2 is a screen box 32, and an inclined screen 33 is provided inside the screen box 32; the aperture of the screen 33 is 5 mm and the inclination angle is 15 degrees; an opening is provided on the side wall of the screen box 32, and the opening is a waste port 34, and 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 vibration motor 1 vibrates the vibrating screen 2.

[0027] 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, since the middle part of the vortex groove structure 51 is V-shaped, the spring 52 contracts under the action of gravity, driving the vortex groove structure 51 to separate to both sides, and when the soil stops falling, the vortex groove structure 51 is closed to the middle under the action of the spring 52, realizing automatic opening and closing to prevent soil from spilling into the crawler chassis 7; the storage turntable 10 also includes a pan head 42, the bottom of the pan head 42 is supported in the crawler chassis 7, the top of the pan head 42 is rotatably connected to the material supporting tray 41, and the pan head 42 is connected to a pan head motor for rotating the material supporting tray 41.

[0028] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0029] Example 3 As another embodiment, this embodiment 3 proposes, based on the embodiment 2, a control method for a layered sampling device for surface soil of a construction site, such as Figure 1-9 As shown, the following steps are included: Step 1, start the power supply, the visual module collects environmental images, and identifies areas with low stone density as sampling points; specifically, a control board is installed in the crawler chassis 7, and the control board is an stm32 control board; the control board is used to control the vibration motor 1, the brushless DC motor 4, the linear push rod 5, the crawler of the crawler chassis 7, and the pan-tilt motor of the pan-tilt 42; the visual module includes a camera, and the camera model is Cam_K230; the camera starts and collects environmental images, identifies stones according to the yolov5 deep learning model, and obtains their coordinates in the camera; according to the coordinates of the stone in the camera, the position and angle of the camera relative to the vehicle body and the entire ground, the distance and direction of the stone relative to the camera are obtained by monocular ranging method; according to the geometric shape and physical properties of the stone, a geometric constraint model is established, and the yolov5 deep learning model is used to extract features in the image, and these features are fused with the information of the geometric constraint model, and the vertical projection area of ​​the stone is calculated and estimated by combining the fusion features of the geometric constraint model and deep learning; Step 2: After reaching the sampling point, adjust the linear push rod 5 to extend, the bucket 9 is in contact with the ground and rotates, the crawler chassis 7 is controlled to move forward, and the screw rod 22 is controlled to rotate forward; specifically, the camera transmits the obstacle coordinates to the control board in real time, and the control board uses A The algorithm generates a path instruction to drive the crawler chassis 7 to avoid obstacles and travel to the sampling point; 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 state of the crawler chassis 7, the distribution of obstacles and the location of the soil sampling point. The weight parameters in the heuristic function of the algorithm; when the crawler chassis 7 is close to an area with dense obstacles, the weight related to the distance to the obstacles is increased, so that the path is more inclined to move away from the obstacles; when the crawler chassis 7 is close to the soil sampling point, the weight related to the distance to the target point is increased to accelerate the convergence to the sampling point; Furthermore, the cubic Bezier curve is combined with the improved A The algorithm is combined with the control points of the Bezier curve to make the path smoother when generating the global path, reduce the tortuosity of the path and the number of turns of the crawler chassis 7, improve the driving efficiency and stability, and ensure that the path avoids the identified stone obstacles; the dynamic weight adjustment mechanism is introduced, and the new A Under the action of the algorithm, the path planning is completed; through the visual recognition module and A The algorithm enables autonomous navigation and obstacle avoidance, making stratified sampling of disturbed soil on construction sites intelligent; After arriving at the sampling point, the visual module cooperates with the control board to determine whether there is soil to be taken in the current direction. If not, the crawler chassis 7 rotates 45 degrees and fine-tunes the position again until there is soil to be taken in the current direction. The control panel controls the linear actuator 5 to extend 72 mm, adjusts the inclination of the screw conveyor 6 to 30°, and the crawler tracks advance at a speed of 0.5 m / s. The bucket cuts the soil at a speed of 200 rpm. Step 3: After the storage bin 40 collects soil to a preset value, the storage turntable 10 is controlled to rotate and the next storage bin 40 is aligned with the discharge port; Step 4: After controlling the screw rod 22 to reverse and discharge the soil in the screw conveyor 6, adjust the linear push rod 5 to retract and repeat steps 2 and 3; Step 5: After the sampling is completed, each motor stops, and the storage turntable 10 is reset to wait for sample recovery.

[0030] It should be noted that the parts in this embodiment that are the same or similar to those in the second embodiment can be referenced to each other and will not be described in detail in this application.

[0031] Example 4 As another embodiment, this fourth embodiment proposes, based on the third embodiment, a more specific control method for the surface soil stratification sampling device for construction land, such as Figure 1-9 As shown, the following steps are included: Step 1: Turn on the power, the visual module collects environmental images, and identifies areas with low stone density as sampling points; Step 2. After arriving at the sampling point, adjust the linear push rod 5 to extend, the bucket 9 fits the ground surface and rotates, controls the crawler chassis 7 to move forward, and controls the screw rod 22 to rotate forward at the same time; after the linear push rod 5 is extended, the screw conveyor 6 forms an inclination angle with the ground, and the inclination angle range is set to 30 degrees-45 degrees. When the screw rod 22 in the screw conveyor 6 rotates, the stones slide down under the influence of gravity, and the screw rod realizes the primary screening of the soil, reducing the stones in the soil from entering the vibrating screen through the discharge port at the end of the screw conveyor. The screw rod 22 sends the pre-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, and the vibrating screen 2 vibrates and screens the soil again. The storage bin 40 is arranged in the crawler 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 cooperate with each other to make the screened soil purer, thereby improving the accuracy of the sampling data; Step 3: After the storage bin 40 collects soil to a preset value, the storage turntable 10 is controlled to rotate so that the next storage bin 40 is aligned with the discharge port. Specifically, a pressure sensor is provided in the storage bin 40. After the pressure sensor detects a mass of 100g, it sends a signal to the control board. The control board controls the pan / tilt motor to rotate 72° to switch positions so that the next empty storage bin 40 is aligned with the discharge port. Step 4: After controlling the screw rod 22 to reverse and discharge the soil in the screw conveyor 6, adjust the linear push rod 5 to retract and repeat steps 2 and 3; specifically, the screw conveyor is reversed for 5 seconds to clean the residual soil in the screw conveyor 6 to ensure that there is no mixing between layers; after the crawler chassis turns, complete 60mm and 100mm depth sampling in sequence, with a footage of 150mm per layer; repeat steps 2 and 3 until the storage bin 40 is fully loaded; Step 5: After the sampling is completed, each motor stops, and the storage turntable 10 is reset to wait for sample recovery.

[0032] It should be noted that the parts in this embodiment that are the same or similar to those in the third embodiment can be referenced to each other and will not be described in detail in this application.

[0033] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A device for sampling surface soil of construction land, characterized in that: include: Vibrating screen, screw conveyor, crawler chassis, storage turntable and transmission mechanism; the vibrating screen is supported on the crawler chassis, with a feed port at the top of the vibrating screen and a discharge port at the bottom of the screw conveyor, the discharge port and the feed port being connected; the bottom of the screw conveyor is provided with an upper support frame and a lower support frame, the upper support frame is connected to a linear push rod, the screw conveyor is connected to the crawler chassis via the linear push rod and the lower support frame; the transmission mechanism includes a transmission rod, the front end of the screw conveyor is connected to a bucket for rotation, a brushless DC motor is fixed to the end of the screw conveyor, the bucket and the brushless DC motor are connected via a transmission rod; the screw conveyor is connected to a screw rod for rotation via the brushless DC motor; a vision module is provided on the top of the screw conveyor; The storage turntable is supported in the crawler chassis; the storage turntable includes a storage bin and a supporting tray, the storage bin is placed on the supporting tray, a discharge port is provided at the bottom of the vibrating screen, and the storage bin is located below the discharge port.

2. The surface soil stratification sampling device for construction land according to claim 1, characterized in that: The transmission mechanism includes a main gear, a slave gear, a chain and a bevel gear; the screw rod is connected to the rotor of the brushless DC motor; a main gear is provided at the end of the screw rod, and a slave gear is provided at the transmission rod, and the main gear and the slave gear are connected by a chain; a rotating shaft passes through the bucket, 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 through the bevel gear.

3. The surface soil stratification sampling device for construction land according to claim 2, characterized in that: A bearing is provided between the brushless DC motor and the main gear; a transmission rod is provided on the outside of the screw conveyor, the transmission rod and the outside of the screw conveyor are connected through a connecting piece, and a bearing is provided between the connecting piece and the slave gear.

4. The surface soil stratification sampling device for construction land according to claim 1, characterized in that: A vibration motor is fixed on the outside of the vibrating screen; the vibrating screen is supported on the crawler chassis through a support frame, and a series shock absorber is connected between the vibrating screen and the support frame.

5. The surface soil stratification sampling device for construction land according to claim 1, characterized in that: The vibrating screen has a screen box inside which is provided an inclined screen; an opening is provided on the side wall of the screen box, which is aligned with the bottom of the screen.

6. The surface soil stratification sampling device for construction land according to claim 1, characterized in that: The storage bin is provided with a bottle mouth and a bottle body; a vortex groove structure is provided in the bottle body below the bottle mouth, and a spring is connected between the vortex groove structure and the bottle body.

7. The surface soil stratification sampling device for construction land according to claim 1, characterized in that: The material storage turntable also includes a platform, the bottom of which is supported in the crawler chassis, and the top of which is rotatably connected to the material supporting tray.

8. A control method for the surface soil stratification sampling device for construction land according to claim 1, characterized in that: The following steps are involved: Step 1: Turn on the power. The vision module collects environmental images and identifies areas with low stone density as sampling points. The control board in the crawler chassis drives the crawler chassis to the sampling point. Step 2: After arriving at the sampling point, adjust the linear push rod to extend, the bucket touches 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 bin collects soil to the preset value, the storage turntable is controlled to rotate and the next storage bin is aligned with the discharge port; Step 4: After controlling the screw rod to reverse and discharge the soil in the screw conveyor, adjust the linear push rod to retract it and repeat steps 2 and 3; Step 5: After the sampling is completed, all motors stop, the storage turntable resets, and waits for sample recovery.

9. The control method of the construction land surface soil stratification sampling device according to claim 8, characterized in that: In step 2, after the linear push rod is extended, the screw conveyor and the ground form an inclination angle. When the screw rod in the screw conveyor rotates, the screw rod performs a preliminary screening of the soil, and the screw rod sends the preliminarily screened soil to the discharge port at the bottom end of the screw conveyor. The discharge port is connected to the vibrating screen, and the vibrating screen vibrates to screen the soil again. The storage bin is set in the crawler chassis, and the storage bin below the vibrating screen discharge port collects the screened soil.

10. The control method of the construction land surface soil stratification sampling device according to claim 8, characterized in that: In step three, the storage bin is provided with a bottle mouth and a bottle body; a vortex groove structure is provided in the bottle body below the bottle mouth, and a spring is connected between the vortex groove structure and the bottle body; the middle part of the vortex groove structure is V-shaped, and when the soil falls to the top of the vortex groove structure, the spring contracts under the action of gravity, driving the vortex groove structure to separate to both sides, and when the soil stops falling, the vortex groove structure automatically closes to the middle under the action of the spring.

Images