A soil sampling device and a soil sampling method for environmental detection

Abstract

The present invention relates to the technical field of soil sampling, specifically a soil sampling device and sampling method for environmental testing, comprising a fixed frame and a telescopic frame that are mutually connected. A sampling group capable of layered soil sampling is provided above the right end of the fixed frame and above the left end of the telescopic frame. A drive group for driving the sampling group to cyclically switch between a retracted state and an expanded state is provided at the right end of the fixed frame and the left end of the telescopic frame. The drive group includes a short rotating drum that is coupled to a support ring on the left end of the telescopic frame, a long rotating drum that is coupled to a support ring on the right end of the fixed frame, and a pair of servo motors. The present invention utilizes a servo motor to drive a main swing frame, which drives its externally connected layers of auxiliary swing frames to pass through the soil in an inner-outer order. Furthermore, by utilizing auxiliary swing frames of different lengths, layered sampling is achieved in soil layers of different depths. This solves the problem of simultaneous multi-point and layered sampling in a specific area, and the entire process is highly efficient and automated.

Description

Technical Field

[0001] The present invention relates to the technical field of soil sampling, in particular to a soil sampling device and a soil sampling method for environmental detection. Background Art

[0002] Common soil environmental sampling activities include regional soil environmental background monitoring, farmland soil environmental quality monitoring, construction project soil environmental assessment monitoring, and soil pollution incident monitoring. Regional soil environmental background monitoring generally only samples the surface layer, i.e., the soil depth between 0 and 0.2 meters.

[0003] A Chinese invention (application number CN202210424276.7) discloses a soil sampler for environmental geological surveys. In the present invention, a cone head is provided at the lower end of the casing for convenient entry into the soil layer, and multiple groups of dispersion slices are provided on the outer wall of the cone head, so that when entering the soil layer, the soil on the outer wall of the casing is squeezed outward as much as possible and becomes loose after cutting, thereby ensuring that it is very easy to pull out the casing after sampling is completed. Multiple groups of equal-height packaging rings are provided on the inner wall of the casing. After sampling is completed, the packaging rings can be directly opened to obtain the sample without further cutting. The packaging rings can be directly used to store the sample and take it away, thereby maintaining the original layered morphology of the soil.

[0004] However, the above patent is a single point for fixed-point sampling. The sampling area and location are confirmed, and the number of points is confirmed according to the point distribution method. The point distribution method can be said to be simple random, block random and system random, or it can be fixed-point sampling. The above patent requires multiple fixed-point drilling and sampling to ensure the rationality and accuracy of regional soil sampling. Its operation is laborious and troublesome, and the sampling process is semi-automated. Summary of the Invention

[0005] In order to overcome the defects in the prior art, the purpose of the present invention is to provide a soil sampling device and a sampling method for environmental detection, so as to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides, on the one hand, a soil sampling device for environmental testing, comprising a fixed frame and a telescopic frame that are mutually connected in a left-right direction, wherein a sampling group capable of sampling soil in layers is provided above the right end of the fixed frame and above the left end of the telescopic frame, and a driving group for driving the sampling group to cyclically switch between a retracted state and an extended state is provided at the right end of the fixed frame and the left end of the telescopic frame;

[0007] The sampling group includes a main swing frame and several auxiliary swing frames that are sleeved on the outside of it, the lengths and widths of the several auxiliary swing frames are increased in equal proportion, the same end of the main swing frame and the several auxiliary swing frames are coaxially connected, and the other ends of the main swing frame and the several auxiliary swing frames are clamped with sampling boxes that are adapted to their respective sizes, a shifting post is welded on one edge of the main swing frame, and arc grooves coaxial with the central axis of the auxiliary swing frame are opened on both sides of the rotating end of the auxiliary swing frame, the shifting post is plugged into the arc groove and can slide, support rings are welded above the left and right outer ends of the fixed frame and the telescopic frame, and the top surface of the support ring is sleeved with a spring pin that is plugged into the side surfaces of the rotating ends of the several auxiliary swing frames, wherein the length of the main swing frame is greater than the height of the support ring from the ground and is at least the height of the sampling box;

[0008] The driving group includes a short rotating drum sleeved with the support ring on the left end of the telescopic frame, a long rotating drum sleeved with the support ring on the right end of the fixed frame, and a pair of servo motors for driving the short rotating drum and the long rotating drum to rotate.

[0009] As a further improvement of the present technical solution, a support ring is also welded above the left end of the fixed frame, and a support shaft is sleeved inside the support ring. The left end of the support shaft is sleeved with the short rotating cylinder through a pin limiter, and the right end of the support shaft is sleeved with the long rotating cylinder and can slide axially.

[0010] As a further improvement of the present technical solution, the main swing frame is H-shaped and a sleeve is welded between the two ends of one end, which is connected to the short rotating cylinder or the long rotating cylinder. The auxiliary swing frame is H-shaped and a ring is welded between the two ends of one end, and the ring is also connected to the short rotating cylinder or the long rotating cylinder. The arc grooves on both sides of the auxiliary swing frame are cocircular with the central axis of the ring, and a shifting post is also embedded in one end of the arc groove. The two adjacent auxiliary swing frames are driven to rotate by plugging the shifting post into the arc groove.

[0011] As a further improvement of the present technical solution, a pair of spring sheets are embedded in the top surface of the sampling box, and a slot for engaging with the pair of spring sheets is provided at one end of the internal connecting plate of the main swing frame. The height of the spring sheet is equal to the thickness of the connecting plate, and the distance between the upper ends of the pair of spring sheets is greater than the inner width of the slot. The connecting plates of several auxiliary swing frames are also provided with slots.

[0012] As a further improvement of the present technical solution, a groove for connecting with the spring pin is provided on one radial side of the collar, and the direction of the groove is the same as the direction of the line connecting the two ends of the arc groove. An oblique chamfer is provided at the intersection of the outer side of the collar and the inner side of the groove away from the arc groove, and the end of the spring pin is an arc end.

[0013] As a further improvement of this technical solution, a cone is welded in the middle of the elastic pin, a spring is sleeved on the end of the elastic pin facing away from the ring, and circular rings are welded on the top surfaces of the short rotating cylinder and the long rotating cylinder, and the circular rings are sleeved on the end of the elastic pin facing away from the ring.

[0014] As a further improvement of the present technical solution, the output shaft of the servo motor faces upward and is coaxially connected to a worm, and the outward ends of the short rotating cylinder and the long rotating cylinder are tightly sleeved with worm wheels that mesh with the worm.

[0015] As a further improvement of the present technical solution, a positioning group is provided in the left end of the fixed frame, and the positioning group includes a cross-shaped soil insertion piece, a hexagonal pressure guide block welded to the top of the soil insertion piece, a positioning rod slidably connected to the side of the pressure guide block, and a bracket for guiding the positioning rod to move horizontally. Limiting holes are symmetrically provided on the inner side of the left end of the fixed frame, and a number of positioning holes are symmetrically provided at equal intervals on the inner side of the telescopic frame. The positioning rod is correspondingly plugged into the limiting hole and the positioning hole. A roller is embedded in the end of the positioning rod facing the soil insertion piece, and a compression spring is provided on this end.

[0016] As a further improvement of the present technical solution, pressure rods are hinged on both sides of the top of the pressure guide block, wherein a through groove for connecting with the pressure rod is provided on the support ring strut welded between the left ends of the fixed frame, a sliding groove is provided in the middle of the side surface of the pressure rod, a pin is embedded in the middle of the inner side of the through groove and the pin is connected with the sliding groove and can slide, and the top of the bracket is welded to the bottom surface of the strut at the through groove.

[0017] On the other hand, the present invention also provides a method for sampling soil for environmental testing, comprising the above-mentioned soil sampling device for environmental testing, and comprising the following steps:

[0018] S1. Pull the telescopic frame out of the fixed frame to form a predetermined range;

[0019] S2. Then insert the long round tube into the upper end of the pressure rod and rotate it upward, driving the pressure guide block and the soil insert to move downward until the soil insert is inserted into the soil and fixed;

[0020] S3, at the same time, the side of the pressure guide block pushes the positioning rod to move horizontally and insert it into the limit hole and one of the positioning holes;

[0021] S4. Then, a pair of servo motors in the left and right directions are activated to respectively drive the short and long rotating drums to rotate counterclockwise by 225 degrees, thereby driving the main swing frame to rotate from horizontal to vertical and embed into the soil layer. At the same time, several auxiliary swing frames are driven to swing and embed into the soil layer, and then soil is taken using several sampling boxes. Then, several sampling boxes are driven to rotate out from above the support ring for removal;

[0022] S5. Take out the main swing frames on the short and long rotating drums and the sampling boxes on several auxiliary swing frames in turn to obtain soil samples of different ranges and depths.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. In the soil sampling device and sampling method for environmental testing, the sampling range is determined by extending and retracting the fixed frame and the telescopic frame, and a sampling group and a driving group are arranged above the two. The servo motor drives the main swing frame to drive the auxiliary swing frames connected to the outside layer by layer to pass through the soil in an inside-out order, and the auxiliary swing frames of different lengths are used to achieve layered sampling in soil layers of different depths. The servo motor is then driven to drive the sampling group to rotate one circle to reset. It solves the problem of simultaneous multi-point and layered sampling in a determined area, and the entire process is efficient and automated.

[0025] 2. In the soil sampling device and sampling method for environmental testing, a positioning group is provided to simultaneously locate the expansion spacing and ground position of the fixed frame and the telescopic frame. The lever principle is used to easily apply pressure to the pressure-guiding block to drive the soil-inserting piece to insert into the soil and position it, and at the same time drive the positioning rod to be inserted into the fixed frame and the telescopic frame, ensuring that the sampling group rotates and collects soil layer by layer stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are merely illustrative and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances under the guidance of the present invention.

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention before soil excavation;

[0028] Figure 2 This is a schematic diagram of the overall structure of the present invention in the soil extraction state;

[0029] Figure 3 This is a schematic diagram of the overall structure of the present invention after soil excavation;

[0030] Figure 4 This is a schematic diagram of the assembly structure of the fixed frame, telescopic frame and drive group of the present invention;

[0031] Figure 5 This is a schematic diagram of the assembly structure of the fixed frame and the telescopic frame of the present invention;

[0032] Figure 6 This is a partial split diagram of the positioning group of the present invention;

[0033] Figure 7 This is a schematic diagram of the assembly structure of the drive group and the sampling group on the left side of the present invention;

[0034] Figure 8 This is a schematic diagram of the assembly structure of the driving group and the sampling group on the right side of the present invention;

[0035] Figure 9 This is a schematic diagram of the assembly structure of the positioning group of the present invention;

[0036] Figure 10 A top view of the sampling assembly of the present invention before sampling;

[0037] Figure 11 A top view of the sampling assembly of the present invention after sampling;

[0038] Figure 12 This is a schematic diagram of the assembly structure of the sampling group of the present invention before sampling;

[0039] Figure 13 It is a partial split diagram of the sampling group of the present invention;

[0040] Figure 14 This is a schematic diagram of the assembly structure of the sampling group of the present invention in the sampling state;

[0041] Figure 15 It is a schematic structural diagram of the sampling box of the present invention;

[0042] Figure 16 This is a schematic diagram of the elastic pin assembly structure of the present invention;

[0043] Figure 17 This is a schematic structural diagram of the sampling assembly of the present invention in the sampling state;

[0044] Figure 18 This is a schematic diagram of the assembly structure of the sampling group of the present invention after sampling;

[0045] Figure 19 For the present invention Figure 10 A is an enlarged structural diagram of FIG.

[0046] The meaning of each number in the figure is:

[0047] 100, fixing frame; 101, limiting hole; 110, supporting ring; 111, through slot; 120, supporting shaft;

[0048] 200, telescopic frame; 201, positioning hole;

[0049] 300, sampling group; 310, main swing frame; 311, sleeve; 312, slot; 313, shift pin; 320, sampling box; 321, spring; 330, auxiliary swing frame; 331, collar; 332, arc groove; 333, groove; 340, spring pin; 341, spring; 342, round table;

[0050] 400, drive group; 410, servo motor; 411, worm; 420, short rotating cylinder; 421, worm gear; 430, long rotating cylinder;

[0051] 500, positioning group; 510, soil insert; 520, pressure guide block; 521, pressure rod; 522, slide; 530, positioning rod; 531, compression spring; 532, roller; 540, bracket. DETAILED DESCRIPTION

[0052] The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only for the purpose of explaining the present invention and are not to be construed as limiting the present invention in any way. Based on the teachings of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to fall within the scope of the present invention. The terms "installed" and "connected" should be understood in a broad sense and can refer to direct connection or indirect connection through an intermediary.

[0053] The terms "central axis," "vertical," "horizontal," "front," "back," "up," "down," "left," "right," "top," "bottom," "inside," and "outside" used herein to indicate positions or location relationships are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, in the description of the present invention, "several" means two or more, unless otherwise specifically defined.

[0054] See also Figures 1-19 As shown, the present invention provides a soil sampling device for environmental testing, comprising a fixed frame 100 and a telescopic frame 200 that are mutually connected in a left-right direction. The fixed frame 100 and the telescopic frame 200 form a C-shaped structure, which is convenient for storage when folded and convenient for simultaneous soil sampling within a certain range when unfolded;

[0055] A sampling group 300 capable of sampling soil in layers is provided above the right end of the fixed frame 100 and above the left end of the telescopic frame 200. Whether sampling is within a certain range or in layers within the soil, the accuracy of sampling and detection is improved; a driving group 400 for driving the sampling group 300 to cyclically switch between a retracted state and an expanded state is provided at the right end of the fixed frame 100 and the left end of the telescopic frame 200, making the sampling process automated and efficient.

[0056] Specifically, the sampling group 300 includes a main swing frame 310 and a plurality of auxiliary swing frames 330 nested thereon. The lengths and widths of the auxiliary swing frames 330 are proportionally increased. The main swing frame 310 and the auxiliary swing frames 330 are coaxially connected at the same end. The other ends of the main swing frame 310 and the auxiliary swing frames 330 are each clamped with a sampling box 320 of a size that matches their respective sizes. The auxiliary swing frames 330, with their increasing rotational radius, cooperate with the main swing frame 310 to embed them into the soil layer. This allows the sampling box 320 to not only extract soil layers in layers, but also eliminates resistance to removing deep soil layers, reducing the supply of rotational force.

[0057] A shifting post 313 is welded to one edge of the main swing frame 310, and arc grooves 332 coaxial with the central axis of the auxiliary swing frame 330 are opened on both sides of the rotating end. The shifting post 313 is inserted into the arc groove 332 and can slide. When the main swing frame 310 and several auxiliary swing frames 330 are in the initial horizontal position, the main swing frame 310 rotates and uses the shifting post 313 to rotate to the lower end of the arc groove 332 to drive the adjacent auxiliary swing frames 330 to rotate downward. Since the sampling box 320 of the main swing frame 310 removes the top layer of soil, the first auxiliary swing frame 330 in the inner layer can remove the soil layer on this basis. Similarly, the second, third and other auxiliary swing frames 330 all remove soil on the basis of the pit of the previous soil layer.

[0058] Furthermore, support rings 110 are welded to the upper left and right outer ends of the fixed frame 100 and the telescopic frame 200. Struts are welded to both sides of the bottom of the support ring 110, and the struts are welded to the top surface of the fixed frame 100 or the telescopic frame 200 in a triangular shape, thereby firmly supporting the main swing frame 310 and the plurality of auxiliary swing frames 330 for rotating soil excavation.

[0059] The top surface of the support ring 110 is sleeved with a spring pin 340 that is inserted into the side surfaces of the rotating ends of several auxiliary swing frames 330. The spring pin 340 is engaged with the several auxiliary swing frames 330 and can slide by utilizing the extension and contraction of the spring pin 340, so that the several auxiliary swing frames 330 remain in a horizontal state. Only when driven by the lever 313, the spring pin 340 is squeezed out and the frame is turned into a rotating state. The length of the main swing frame 310 is greater than the height of the support ring 110 from the ground and is at least the height of the sampling box 320, so that the sampling box 320 can obtain the surface soil.

[0060] In addition, the driving group 400 includes a short rotating drum 420 sleeved with the support ring 110 on the left end of the telescopic frame 200, a long rotating drum 430 sleeved with the support ring 110 on the right end of the fixed frame 100, and a pair of servo motors 410 for driving the short rotating drum 420 and the long rotating drum 430 to rotate;

[0061] The output shaft of the servo motor 410 faces upward and is coaxially connected to the worm 411. The outward ends of the short rotating cylinder 420 and the long rotating cylinder 430 are tightly fitted with a worm wheel 421 that meshes with the worm 411. The servo motor 410 is powered by a generator or battery.

[0062] Furthermore, a support ring 110 is also welded to the upper left end of the fixed frame 100. This support ring 110 is coaxially arranged with the above-mentioned two support rings 110, and a support shaft 120 is sleeved inside the support ring 110. The left end of the support shaft 120 is sleeved with the short rotating cylinder 420 by a pin limiter. An annular groove is provided on the outer side of the left end of the support shaft 120, and the inner end of the pin is stuck in the annular groove, so that the short rotating cylinder 420 does not drive the support shaft 120 to rotate; wherein a strip groove is provided through the radial horizontal side surface of the support shaft 120, and a round shaft passing through the strip groove is inserted into the side surface of this support ring 110; the right end of the support shaft 120 is sleeved with the long rotating cylinder 430 and can slide axially, so that when the telescopic frame 200 is contracted, the support shaft 120 is also contracted into the long rotating cylinder 430, thereby adjusting the sampling spacing of a pair of sampling groups 300.

[0063] Specifically, the main swing frame 310 is H-shaped and has a sleeve 311 welded between the two ends of one end thereof, which is sleeved with the short rotating cylinder 420 or the long rotating cylinder 430. The sleeve 311 and the short rotating cylinder 420 or the long rotating cylinder 430 are sleeved with pins to limit the connection, so that the main swing frame 310 rotates synchronously with the short rotating cylinder 420 or the long rotating cylinder 430.

[0064] The auxiliary swing frame 330 is H-shaped and has rings 331 welded on both ends of one end. The rings 331 are also connected to the short rotating cylinder 420 or the long rotating cylinder 430. The arc grooves 332 on both sides of the auxiliary swing frame 330 are coaxial with the rings 331. A shifting post 313 is also embedded in one end of the arc groove 332. The rotation of two adjacent auxiliary swing frames 330 is driven by the connection between the shifting post 313 and the arc groove 332.

[0065] Furthermore, a pair of spring clips 321 are embedded in the top surface of the sampling box 320, and a slot 312 for engaging with the pair of spring clips 321 is provided at one end of the internal connecting plate of the main swing frame 310. The height of the spring clip 321 is equal to the thickness of the connecting plate, and the distance between the upper ends of the pair of spring clips 321 is greater than the inner width of the slot 312. The connecting plates of several auxiliary swing frames 330 are also provided with slots 312, so that the sampling box 320 is easy to disassemble and not easy to slip off during installation, which is conducive to rotating with the main swing frame 310 and the auxiliary swing frame 330 to take soil.

[0066] It is worth noting that a groove 333 is formed on one radial side of the collar 331 to engage with the spring pin 340, and the direction of the groove 333 is the same as the direction of the line connecting the two ends of the arc groove 332. An oblique chamfer is formed at the intersection of the outer side of the collar 331 and the inner side of the groove 333 away from the arc groove 332, and the end of the spring pin 340 is an arc end.

[0067] A circular platform 342 is welded to the middle of the spring pin 340. A spring 341 is sleeved on the end of the spring pin 340 facing away from the collar 331. Rings are welded to the top surfaces of both the short rotating cylinder 420 and the long rotating cylinder 430, and the rings are sleeved on the ends of the spring pin 340 facing away from the collar 331. The rings are coaxially arranged with the short rotating cylinder 420 and the long rotating cylinder 430, so that the spring pin 340 automatically inserts axially into the grooves 333 of the auxiliary swing frames 330 under the elastic force of the spring 341, locking them in the horizontal starting position.

[0068] When the main swing frame 310 rotates downward and slides to the lower end of the arc groove 332 of the adjacent auxiliary swing frame 330 using the shifting post 313, pressure is applied to the auxiliary swing frame 330, and the spring pin 340 is squeezed out of the groove 333 using the bevel chamfer, so that the auxiliary swing frame 330 rotates downward and follows the main swing frame 310 to take soil. The inner auxiliary swing frame 330 also drives the outer auxiliary swing frame 330 to rotate downward through this principle, so as to take soil layer by layer in sequence.

[0069] In addition, a positioning group 500 is provided in the left end of the fixed frame 100, which is used to simultaneously locate the expansion spacing and ground position of the fixed frame 100 and the telescopic frame 200, in order to ensure that the sampling group 300 rotates and extracts soil layer by layer stably;

[0070] The positioning assembly 500 includes a cross-shaped soil insert 510, a hexagonal pressure guide block 520 welded to the top of the soil insert 510, a positioning rod 530 slidably connected to the side of the pressure guide block 520, and a bracket 540 for guiding the positioning rod 530 in horizontal lateral movement. The top of the bracket 540 is welded to the bottom surface of the support rod at the through slot 111.

[0071] A limiting hole 101 is symmetrically provided on the inner side of the left end of the fixed frame 100, and a number of positioning holes 201 are symmetrically provided on the inner side of the telescopic frame 200 at equal intervals. The positioning rod 530 is correspondingly plugged into the limiting hole 101 and the positioning hole 201. A roller 532 is embedded in the end of the positioning rod 530 facing the inserting piece 510, and a compression spring 531 is provided on this end. The roller 532 is in rolling contact with the side of the pressure guide block 520 to make the linkage between them more stable and better. The compression spring 531 is used to press the roller 532 of the positioning rod 530 to always contact the pressure guide block 520, thereby realizing real-time linkage.

[0072] Specifically, pressure rods 521 are hinged on both sides of the top of the pressure guide block 520, and a through groove 111 is provided on the support rod of the support ring 110 welded between the left ends of the fixing frame 100, which is plugged into the pressure rod 521. A sliding groove 522 is provided in the middle of the side of the pressure rod 521, and a pin is embedded in the middle of the inner side of the through groove 111 and the pin is plugged into the sliding groove 522 and can slide, so that the pressure rod 521 can both rotate and slide, ensuring the vertical movement of the pressure guide block 520 and driving the soil inserting piece 510 to be smoothly inserted into the soil, thereby realizing the overall positioning.

[0073] The soil sampling method for environmental testing of the present invention comprises the following steps:

[0074] S1, first pull the telescopic frame 200 out of the fixed frame 100 to form a predetermined range;

[0075] S2. Then, insert the long round tube into the upper end of the pressure rod 521 and rotate it upward, driving the pressure guide block 520 and the soil inserting piece 510 to move downward until the soil inserting piece 510 is inserted into the soil and fixed; this round tube can be made into 1m long, and the lever principle is used to make it easy for workers to press the soil inserting piece 510 in and out of the soil; the fixing frame 100 has open rings welded on both sides for clamping the round tube so that it can be taken out and stored at any time;

[0076] S3, at the same time, the side of the pressure guide block 520 pushes the positioning rod 530 to move horizontally and insert it into the limiting hole 101 and one of the positioning holes 201;

[0077] S4. Then, a pair of servo motors 410 in the left and right directions are activated to respectively drive the short rotating drum 420 and the long rotating drum 430 to rotate counterclockwise by 225 degrees, thereby driving the main swing frame 310 to rotate from horizontal to vertical and embed into the soil layer. At the same time, the auxiliary swing frames 330 are driven to swing and embed into the soil layer, and then the soil is taken out of the soil using the sampling boxes 320. The sampling boxes 320 are then driven to rotate out from above the support ring 110 for removal.

[0078] S5. Take out the main swing frame 310 and the sampling boxes 320 on the auxiliary swing frames 330 on the short rotating drum 420 and the long rotating drum 430 in sequence, and obtain soil samples of different ranges and depths.

[0079] It should be noted that the above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit and substance of the present invention are intended to be encompassed within the scope of protection of the present invention.

Claims

1. A soil sampling device for environmental testing, characterized by: The invention comprises a fixed frame (100) and a telescopic frame (200) which are mutually sleeved in the left-right direction, wherein a sampling group (300) capable of sampling soil in layers is provided above the right end of the fixed frame (100) and above the left end of the telescopic frame (200), and a driving group (400) for driving the sampling group (300) to cyclically switch between a folded state and an expanded state is provided at the right end of the fixed frame (100) and the left end of the telescopic frame (200); The sampling group (300) includes a main swing frame (310) and a plurality of auxiliary swing frames (330) connected thereto in layers, the lengths and widths of the plurality of auxiliary swing frames (330) are increased in proportion, the same end of the main swing frame (310) and the plurality of auxiliary swing frames (330) are coaxially connected, the other ends of the main swing frame (310) and the plurality of auxiliary swing frames (330) are clamped with sampling boxes (320) that are adapted to their respective sizes, a shifting post (313) is welded on one side edge of the main swing frame (310), and the auxiliary swing frames (330) are connected to the main swing frame (310). 0) are provided with arc grooves (332) coaxial with the central axis thereof on both sides of the rotating end, the shifting post (313) is plugged into the arc groove (332) and can slide, support rings (110) are welded above the left and right outer ends of the fixed frame (100) and the telescopic frame (200), and the top surface of the support ring (110) is sleeved with a spring pin (340) plugged into the side surfaces of the rotating ends of the plurality of auxiliary swing frames (330), wherein the length of the main swing frame (310) is greater than the height of the support ring (110) from the ground and is at least the height of the sampling box (320); The driving group (400) comprises a short rotating drum (420) sleeved with a support ring (110) on the left end of the telescopic frame (200), a long rotating drum (430) sleeved with a support ring (110) on the right end of the fixed frame (100), and a pair of servo motors (410) for driving the short rotating drum (420) and the long rotating drum (430) to rotate.

2. The soil sampling device for environmental monitoring according to claim 1, characterized in that: A support ring (110) is also welded above the left end of the fixing frame (100), and a support shaft (120) is sleeved inside the support ring (110). The left end of the support shaft (120) is sleeved with the short rotating cylinder (420) via a pin, and the right end of the support shaft (120) is sleeved with the long rotating cylinder (430) and can slide axially.

3. The soil sampling device for environmental monitoring according to claim 1, characterized in that: The main swing frame (310) is H-shaped and has a sleeve (311) welded between its two ends at one end, which is sleeved with the short rotating cylinder (420) or the long rotating cylinder (430). The auxiliary swing frame (330) is H-shaped and has a sleeve (331) welded between its two ends at one end. The sleeve (331) is also sleeved with the short rotating cylinder (420) or the long rotating cylinder (430). The arc grooves (332) on both sides of the auxiliary swing frame (330) are coaxial with the sleeve (331). A shifting post (313) is also embedded in one end of the arc groove (332). Two adjacent auxiliary swing frames (330) are driven to rotate by plugging the shifting post (313) into the arc groove (332).

4. The soil sampling device for environmental monitoring according to claim 1, characterized in that: A pair of spring sheets (321) are embedded in the top surface of the sampling box (320), and a slot (312) for engaging with the pair of spring sheets (321) is provided at one end of the internal connecting plate of the main swing frame (310). The height of the spring sheet (321) is equal to the thickness of the connecting plate, and the distance between the upper ends of the pair of spring sheets (321) is greater than the inner width of the slot (312). The connecting plates of the auxiliary swing frames (330) are also provided with slots (312).

5. The soil sampling device for environmental monitoring according to claim 3, characterized in that: A groove (333) for plugging into the elastic pin (340) is provided on one radial side of the collar (331), and the orientation of the groove (333) is the same as the orientation of the line connecting the two ends of the arc groove (332). An oblique chamfer is provided at the intersection of the outer side of the collar (331) and the inner side of the groove (333) away from the arc groove (332), and the end of the elastic pin (340) is an arc end.

6. The soil sampling device for environmental monitoring according to claim 5, characterized in that: A round table (342) is welded to the middle of the elastic pin (340), and a spring (341) is sleeved on one end of the elastic pin (340) facing away from the collar (331). Circular rings are welded to the top surfaces of the short rotating cylinder (420) and the long rotating cylinder (430), and the circular rings are sleeved on one end of the elastic pin (340) facing away from the collar (331).

7. The soil sampling device for environmental monitoring according to claim 1, characterized in that: The output shaft of the servo motor (410) faces upward and is coaxially connected to a worm (411), and the outward ends of the short rotating cylinder (420) and the long rotating cylinder (430) are tightly sleeved with a worm wheel (421) that meshes with the worm (411).

8. The soil sampling device for environmental monitoring according to claim 1, characterized in that: A positioning group (500) is provided in the left end of the fixing frame (100), and the positioning group (500) comprises a cross-shaped soil inserting piece (510), a hexagonal pressure guide block (520) welded to the top of the soil inserting piece (510), a positioning rod (530) slidably connected to the side of the pressure guide block (520), and a bracket (540) for guiding the positioning rod (530) to move horizontally. A limiting hole (101) is symmetrically provided on the inner side of the left end of the fixing frame (100), and a plurality of positioning holes (201) are symmetrically provided on the inner side of the telescopic frame (200) at equal intervals. The positioning rod (530) is correspondingly plugged into the limiting hole (101) and the positioning hole (201). A roller (532) is embedded in one end of the positioning rod (530) facing the soil inserting piece (510), and a compression spring (531) is sleeved on this end.

9. The soil sampling device for environmental monitoring according to claim 8, characterized in that: The top sides of the pressure guide block (520) are hinged with pressure rods (521), wherein a through groove (111) for plugging into the pressure rod (521) is provided on the support rod of the support ring (110) welded between the left ends of the fixing frame (100), and a sliding groove (522) is provided in the middle of the side of the pressure rod (521), and a pin is embedded in the middle of the inner side of the through groove (111) and the pin is plugged into the sliding groove (522) and can slide, and the top of the bracket (540) is welded to the bottom surface of the support rod at the through groove (111).

10. A soil sampling method for environmental testing, comprising the soil sampling device for environmental testing according to claim 9, characterized in that: The following steps are involved: S1, first pull the telescopic frame (200) out of the fixed frame (100) to form a predetermined range; S2, then insert the long round tube into the upper end of the pressure rod (521) and rotate it upward, driving the pressure guide block (520) and the soil inserting piece (510) to move downward until the soil inserting piece (510) is inserted into the soil and fixed; S3, simultaneously, the side of the pressure guide block (520) pushes the positioning rod (530) to move horizontally and insert it into the limiting hole (101) and one of the positioning holes (201); S4, then starting a pair of servo motors (410) in the left and right directions to respectively drive the short rotating drum (420) and the long rotating drum (430) to rotate counterclockwise by 225 degrees, thereby driving the main swing frame (310) to rotate from horizontal to vertical and embed into the soil layer, and at the same time driving the plurality of auxiliary swing frames (330) to swing and embed into the soil layer, and then using the plurality of sampling boxes (320) to take soil, and then driving the plurality of sampling boxes (320) to rotate out from above the support ring (110) to be taken out; S5. The main swing frame (310) and the sampling boxes (320) on the short rotating drum (420) and the long rotating drum (430) are sequentially taken out, and soil samples of different ranges and depths can be obtained.

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