Cubic soil sampling device

Abstract

The invention relates to a cubic soil sampling device. The cubic soil sampling device provided by the embodiment of the invention comprises a fixed cylinder, four groups of cutting knives, a driving assembly and a root cutting assembly. In the cutting process, the cutting knife only has the pressing force in the third direction, so that the soil sample cannot be extruded in the first direction or the second direction. Then the root cutting assembly is rotated, the root cutting assembly swings on the side, away from the fixed cylinder, of the cutting knife, rotation of the root cutting assembly does not interfere with the cutting knife, the surface, connected with the land, of the last side of the soil sample can be cut off, and then cutting of the cuboid soil sample can be completed; then, the cut soil sample only needs to be taken out of a pit formed by cutting in the third direction, a regular cuboid soil sample can be obtained, the soil sample is not extruded and keeps the original compactness, and in the cutting process of the cutting knife, the root cutting assembly can be rotated to the side away from the soil; therefore, the cutter can cut the soil.

Description

Technical Field

[0001] The present application relates to the technical field of soil sampling, and in particular to a cubic soil sampling device. Background Art

[0002] Soil sampling is often involved in the fields of earth science, environmental science and technology, and resource science and technology, and the soil sampling device is an important tool for soil collection.

[0003] Conventional soil sampling devices are cylindrical sampling tubes that can only obtain cylindrical soil samples. The sampling tube is inserted into the soil so that the soil fills the tube, and then the sampling tube is pulled upward to obtain the soil sample. For loose soil, the soil is easy to fall from the sampling port of the sampling tube, and repeated sampling is required, which is time-consuming and laborious. In addition, for compact soil, the insertion of the sampling tube requires greater force. As a result, the soil sampling tool squeezes and cuts into the soil through the sampling head, and the obtained soil sample is often squeezed by the sampling tool, which changes the original density of the soil.

[0004] If it is necessary to obtain square-shaped soil samples, conventional soil sampling devices cannot meet the needs of such soil sampling scenarios. Flat knives are often used for multiple cutting and collection, which results in problems such as irregular sampling, complex sampling operations, high difficulty, and difficulty in root removal. Summary of the invention

[0005] Based on this, it is necessary to provide a cubic soil sampling device as conventional soil sampling devices cannot meet the sampling needs of square soil and often use flat knives to cut and collect multiple times, resulting in irregular sampling samples, complex sampling operations, high difficulty, and difficulty in root cutting.

[0006] A cubic soil sampling device, comprising:

[0007] Fixed cylinder;

[0008] Four groups of cutting knives, wherein two groups of the cutting knives are respectively arranged on both sides of the fixed tube along a first direction and can swing around the axis of the first direction, and the other two groups of the cutting knives are respectively arranged on both sides of the fixed tube along a second direction and can swing around the axis of the second direction;

[0009] A driving assembly, used for driving the four groups of cutting knives to swing around their respective corresponding axes;

[0010] A root cutting assembly comprises a first connecting member, a second connecting member and a cutting line; the two ends of the cutting line along the first direction are respectively connected to one end of the first connecting member and one end of the second connecting member, and the other end of the first connecting member and the other end of the second connecting member are respectively connected to the two sides of the fixed tube along the first direction for rotation; when the root cutting assembly rotates around the axis of the first direction, the cutting line can bypass the side of the cutting knife away from the fixed tube along the third direction, so that the cutting line rotates from one side of the fixed tube along the second direction to the other side; the first direction, the second direction and the third direction are perpendicular to each other, and the third direction is the axial direction of the fixed tube.

[0011] In one embodiment, the driving assembly includes a power unit, an active member and four driven members. The power unit is connected to the fixed cylinder and drives the active member to rotate around the axis of the third direction. The four driven members are coaxially arranged and connected to the four groups of cutting knives respectively. The active member is used to drive the four driven members to rotate around their axes.

[0012] In one embodiment, the cubic soil sampling device further comprises four swing assemblies, and the four swing assemblies, the four sets of cutting knives and the four followers correspond to each other one by one;

[0013] The swing assembly includes a crank wheel, a connecting rod, a swing part, a first shaft, a second shaft and a third shaft, the third shaft is passed through the side wall of the fixed cylinder and the two ends are respectively connected to the crank wheel and the driven member, the third shaft, the crank wheel and the driven member are coaxially arranged, the swing part is rotatably connected to the side wall of the fixed cylinder, the first shaft is passed through one end of the connecting rod and the crank wheel, and the second shaft is passed through the other end of the connecting rod and the swing part;

[0014] The connecting rod is rotatably connected to the crank wheel around the axis of the first shaft, and the first shaft and the third shaft are arranged in parallel and spaced apart; the connecting rod is rotatably connected to the swing part around the axis of the second shaft, and the second shaft and the rotation axis of the swing part are arranged in parallel and spaced apart.

[0015] In one embodiment, the cubic soil sampling device further comprises two first rails and two sliding members, wherein the two first rails are respectively connected to two sides of the fixing tube along the first direction and extend along the second direction;

[0016] Two ends of the root cutting assembly are rotatably connected to the two sliding members respectively, and the two sliding members are slidably connected to the two first rails respectively along the second direction.

[0017] In one embodiment, the cubic soil sampling device further comprises two sets of second rails, the two sets of second rails are respectively connected to the two sides of the fixing tube along the first direction and extend along the third direction;

[0018] The two first rails are respectively connected to the two groups of the second rails in a sliding manner along the third direction.

[0019] In one embodiment, the first connecting member is a first telescopic member, and the second connecting member is a second telescopic member;

[0020] The two ends of the cutting line are respectively connected to the first telescopic member and the second telescopic member, and one end of the first telescopic member is rotatably connected to one side of the fixing tube along the first direction;

[0021] One end of the second telescopic member is rotatably connected to the other side of the fixing tube along the first direction, and the first telescopic member and the second telescopic member are respectively located on both sides of the cutting knife along the first direction.

[0022] In one embodiment, the root cutting assembly further comprises a reciprocating drive mechanism, wherein the reciprocating drive mechanism comprises a driving portion, a driving wheel and an elastic member;

[0023] The driving part is connected to the fixed cylinder and drives the driving wheel to rotate around the axis of the second direction; the cutting line includes a first extension part, a cutting part and a second extension part connected in sequence, the end of the first extension part away from the cutting part is connected to the driving wheel and extends along the first telescopic part, and the second extension part extends along the second telescopic part; one end of the elastic part is connected to the fixed cylinder, and the other end is connected to an end of the second extension part away from the cutting part.

[0024] In one embodiment, the reciprocating drive mechanism also includes a driven wheel and a wire pulling head, the wire pulling head is arranged on a side surface of the driven wheel and is spaced apart from the axis of the driven wheel, the driven wheel is rotatably connected to the fixed cylinder around the axis of the second direction, the driving wheel drives the driven wheel to rotate, and the end of the first extension portion facing away from the cutting portion is connected to the wire pulling head.

[0025] In one embodiment, the cutting knife includes a handle and a knife head, and the handle is rotatably connected to the knife head so as to fold the knife head.

[0026] In one embodiment, the cubic soil sampling device also includes four limit assemblies corresponding to the four groups of cutting knives one by one, the limit assemblies include a first protrusion, a second protrusion and a limit rod, the first protrusion and the second protrusion are respectively located on both sides of the swinging direction of the cutting knife and are connected to the fixed tube, the two ends of the limit rod are respectively connected to the first protrusion and the second protrusion, and the cutting knife is located between the outer wall of the fixed tube and the limit rod and swings.

[0027] During use, the above-mentioned cubic soil sampling device drives the four groups of cutting knives to swing around their swing axes through the driving assembly, so that the four groups of cutting knives can cut off a square outline of a plane along the first direction and the second direction. And the earth extending along the third direction, that is, the rectangular soil sample. And when the cutting knives are not pulled out of the gap between the cut earth and the land, the soil sample is clamped between the four groups of cutting knives. During the cutting process, the cutting knives only have a compressive force along the third direction, so they will not squeeze the soil sample along the first direction or the second direction, thereby ensuring the original density of the soil. Then the root cutting assembly is rotated, and the root cutting assembly is located on the side of the cutting knife away from the fixed tube and swings. The rotation of the root cutting assembly will not interfere with the cutting knife, and the surface of the last side of the soil sample connected to the ground can be cut off to complete the cutting of the rectangular soil sample. Then, the cut soil sample only needs to be taken out of the pit formed by the cutting along the third direction to obtain a regular rectangular soil sample, and the soil sample is not squeezed and maintains the original density. During the cutting process of the cutting knife, the root cutting assembly can be rotated to the side away from the soil so that the cutting knife can cut the soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. 1 is a schematic diagram of a cubic soil sampling device according to an embodiment of the present invention.

[0029] Figure 2 A schematic diagram of the drive assembly.

[0030] Figure 3 Schematic diagram of the root cutting assembly.

[0031] Description of Figure Numbers:

[0032] 10-cubic soil sampling device;

[0033] 100-fixed cylinder;

[0034] 200-cutting knife; 210-knife handle; 220-knife head;

[0035] 300-driving assembly; 310-power unit; 320-active member; 330-driven member;

[0036] 400-root cutting assembly; 410-first telescopic member; 420-second telescopic member; 430-cutting line; 431-first extension portion; 432-cutting portion; 433-second extension portion; 440-guide wheel; 401-accommodating groove;

[0037] 500-swing assembly; 510-crank wheel; 520-connecting rod; 530-swing part; 540-first shaft; 550-second shaft; 560-third shaft;

[0038] 600-first track; 610-sliding member; 630-second track;

[0039] 700-reciprocating drive mechanism; 710-driving unit; 720-driving wheel; 730-elastic member; 740-driven wheel; 750-pulling wire head;

[0040] 800-limiting assembly; 810-first protrusion; 820-second protrusion; 830-limiting rod;

[0041] 900- gripping part;

[0042] OX-first direction; OY-second direction; OZ-third direction. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0044] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0045] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0047] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0049] See also Figure 1 , Figure 1 The schematic diagram of the structure of the cubic soil sampling device 10 in one embodiment of the present application is shown. Figure 2 and Figure 3 A cubic soil sampling device 10 provided in one embodiment of the present application includes: a fixed cylinder 100 , four sets of cutting knives 200 , a driving assembly 300 and a root cutting assembly 400 .

[0050] In the above-mentioned cubic soil sampling device 10, two groups of cutting knives 200 are respectively arranged on both sides of the fixed cylinder 100 along the first direction OX and can swing around the axis of the first direction OX, and the other two groups of cutting knives 200 are respectively arranged on both sides of the fixed cylinder 100 along the second direction OY and can swing around the axis of the second direction OY. The driving assembly 300 is used to drive the four groups of cutting knives 200 to swing around their respective corresponding axes. The root cutting assembly 400 includes a first connecting member, a second connecting member and a cutting line. The two ends of the cutting line 430 along the first direction OX are respectively connected to one end of the first connecting member and one end of the second connecting member, and the other end of the first connecting member and the other end of the second connecting member are respectively connected to the two sides of the fixed cylinder 100 along the first direction OX. When the root cutting assembly 400 rotates around the axis of the first direction OX, the cutting line 430 can bypass the side of the cutting knife 200 away from the fixed cylinder 100 along the third direction OZ, so that the cutting line 430 rotates from one side of the fixed cylinder 100 in the second direction OY to the other side. The first direction OX, the second direction OY, and the third direction OZ are perpendicular to each other, and the third direction OZ is the axial direction of the fixing tube 100 .

[0051] During use of the cubic soil sampling device 10, the driving assembly 300 drives the four groups of cutting knives 200 to swing around their swing axes respectively, so that the four groups of cutting knives 200 can cut off a square outline of a plane along the first direction OX and the second direction OY. And the earth extending along the third direction OZ, that is, the rectangular soil sample. And when the cutting knives 200 are not pulled out of the gap between the cut earth and the land, the soil sample is clamped between the four groups of cutting knives 200. During the cutting process, the cutting knives 200 only have a compressive force along the third direction OZ, so they will not squeeze the soil sample along the first direction OX or the second direction OY, thereby ensuring the original density of the soil. Then, the first connecting member and the second connecting member are rotated to drive the cutting line 430 to rotate around the axis of the first direction OX. The first connecting member and the second connecting member are located on both sides of the cutting knife 200 along the first direction OX during the rotation. The cutting line 430 rotates from one side of the second direction OY of the fixed tube 100 to the other side, so that the cutting line 430 can bypass the side of the cutting knife 200 away from the fixed tube 100 along the third direction OZ. The rotation of the root cutting assembly 400 will not interfere with the cutting knife 200, and the surface of the last side of the soil sample connected to the land can be cut off to complete the cutting of the rectangular soil sample. Then, the soil sample that has been cut only needs to be taken out of the pit formed by the cutting along the third direction OZ to obtain a regular rectangular soil sample, and the soil sample is not squeezed and maintains the original density. During the cutting process of the cutting knife 200, the root cutting assembly 400 can be rotated to the side away from the soil so that the cutting knife 200 can cut the soil.

[0052] Since the cutting blade 200 clamps the periphery of the soil sample, if the friction between the soil sample and the cutting blade 200 is large enough, the cubic soil sampling device 10 can be lifted to remove the rectangular soil sample from the hole. If the soil sample is located in the hole after the cubic soil sampling device 10 is lifted, the soil sample can be removed along the cutting gap. The specific method for removing the soil sample is performed according to the actual situation.

[0053] Preferably, the cubic soil sampling device 10 further comprises a gripping portion 900, which is connected to an end of the fixing tube 100 away from the soil sample, so as to allow an operator to hold the entire cubic soil sampling device 10 during cutting or lifting, thereby ensuring the stability and controllability of the entire sampling process.

[0054] Specifically, the gripping portion 900 has two portions respectively connected to the two sides of the fixed cylinder 100 along the second direction OY, so that the operator can hold the two sides of the fixed cylinder 100 along the second direction OY. This is mainly because at least the part of the root cutting assembly 400 that cuts the soil extends along the first direction OX, which is equivalent to holding the two sides of the swinging direction of the root cutting assembly 400, thereby making the swinging of the root cutting assembly 400 smoother.

[0055] Each group of cutting blades 200 may be composed of a plurality of cutting blades 200 arranged in parallel and synchronously swinging along a direction perpendicular to the third direction OZ, or may be composed of a single cutting blade 200.

[0056] See also Figure 1 and Figure 2 In one embodiment, the driving assembly 300 includes a power unit 310, a driving member 320 and four driven members 330. The power unit 310 is connected to the fixed cylinder 100 and drives the driving member 320 to rotate around the axis of the third direction OZ. The four driven members 330 are coaxially arranged and connected to the four groups of cutting knives 200, respectively, and the rotation axes of two adjacent driven members 330 are perpendicular to each other. The driving member 320 is used to drive the four driven members 330 to rotate around its axis, so that the driving member 320 is driven to rotate by the power unit 310, so that the driving member 320 can simultaneously drive the four driven members 330 to rotate, so that the four driven members 330 simultaneously drive the four groups of cutting knives 200 to swing synchronously, so that the cutting knives 200 can synchronously cut deep into the soil along the third direction OZ.

[0057] Specifically, the power unit 310 is a motor and a reducer, the driving member 320 is a driving gear, and the driven member 330 is a driven gear. The rotation axes of the driving gear and the driven gear are perpendicular to each other, and the driving gear and the driven gear are meshed with each other.

[0058] See also Figure 1In one embodiment, the cubic soil sampling device 10 further includes four swing assemblies 500, and the four swing assemblies 500, the four sets of cutting knives 200 and the four driven members 330 correspond to each other. The swing assembly 500 includes a crank wheel 510, a connecting rod 520, a swing part 530, a first shaft 540, a second shaft 550 and a third shaft 560. The third shaft 560 is provided through the side wall of the fixed cylinder 100 and the two ends are respectively connected to the crank wheel 510 and the driven member 330. The third shaft 560, the crank wheel 510 and the driven member 330 are coaxially arranged. The swing part 530 is rotatably connected to the side wall of the fixed cylinder 100. The first shaft 540 is provided through one end of the connecting rod 520 and the crank wheel 510, and the second shaft 550 is provided through the other end of the connecting rod 520 and the swing part 530. The connecting rod 520 is connected to the crank wheel 510 for rotation around the axis of the first shaft 540, and the first shaft 540 is arranged parallel to the third shaft 560. The connecting rod 520 is connected to the swinging part 530 for rotation around the axis of the second shaft 550, and the second shaft 550 is arranged parallel to the rotation axis of the swinging part 530. In this embodiment, the driving member drives the active member 320 to rotate, the active member 320 drives the driven member 330 to rotate, the driven member 330 drives the third shaft 560 to rotate, the third shaft 560 drives the crank wheel 510 to rotate, and the crank wheel 510 drives one end of the connecting rod 520 to rotate. Since the first shaft 540 of the connecting rod 520 is arranged parallel to the third shaft 560, and the second shaft 550 is arranged parallel to the rotation axis of the swinging part 530, the connecting rod 520 can drive the swinging part 530 to swing, and then the swinging part 530 drives the cutting blade 200 to swing to cut the soil.

[0059] Specifically, the power unit 310 can also be a reciprocating motor, and the driven member 330 directly drives the cutting knife 200 to swing. The swing structure of the cutting knife 200 can also be other ways, which will not be described here.

[0060] See also Figure 1 In one embodiment, the cubic soil sampling device 10 further includes two first rails 600 and two sliding members 610. The two first rails 600 are respectively connected to the two sides of the fixed cylinder 100 along the first direction OX and extend along the second direction OY. The two ends of the root cutting assembly 400 are respectively rotatably connected to the two sliding members 610, and the two sliding members 610 are respectively slidably connected to the two first rails 600 along the second direction OY. Therefore, the root cutting can be completed by rotating the root cutting assembly 400, or the root cutting assembly 400 can be rotated to a specific position and then the two sliding members 610 are driven to move along the second direction OY along the first rails 600, thereby driving the root cutting assembly 400 as a whole to move along the second direction OY, thereby completing the root cutting operation, and the root of the soil cut in this process is a plane rather than an arc surface.

[0061] See also Figure 1In one embodiment, the cubic soil sampling device 10 further includes two sets of second rails 630, which are respectively connected to the two sides of the fixed tube 100 along the first direction OX and extend along the third direction OZ. The two first rails 600 are respectively connected to the two sets of second rails 630 in a sliding manner along the third direction OZ, so that the root cutting assembly 400 can be driven to approach or move away from the soil along the third direction OZ, and the root cutting length can be controlled. When root cutting is not needed temporarily, the root cutting assembly 400 is moved along the third direction OZ to the end away from the soil to prevent the root cutting assembly 400 from interfering with the swing of the cutting knife 200. After the cutting knife 200 completes cutting, the root cutting assembly 400 is moved close to the soil along the third direction OZ, so that the root cutting assembly 400 can be flexibly moved, making the entire sampling process more convenient and stable.

[0062] Specifically, each group of second rails 630 includes two second rails 630 , which are arranged at intervals along the second direction OY. The second rails 630 extend along the third direction OZ, and both ends of the first rail 600 are slidably matched with the two second rails 630 .

[0063] See also Figure 1 and Figure 3 In one embodiment, the first connecting member is a first telescopic member 410, and the second connecting member is a second telescopic member 420. The two ends of the cutting line 430 are connected to the first telescopic member 410 and the second telescopic member 420 respectively, and one end of the first telescopic member 410 is rotatably connected to one side of the fixed tube 100 along the first direction OX. One end of the second telescopic member 420 is rotatably connected to the other side of the fixed tube 100 along the first direction OX, and the first telescopic member 410 and the second telescopic member 420 are respectively located on both sides of the cutting knife 200 along the first direction OX. In this embodiment, the cutting line 430 is stretched straight by the first telescopic member 410 and the second telescopic member 420, and the root cutting operation is performed by the cutting line 430. When root cutting is not required, the first telescopic member 410 and the second telescopic member 420 are retracted and rotated to the side away from the soil to ensure that the cutting knife 200 swings and cuts smoothly. When root cutting is required, the first telescopic member 410 and the second telescopic member 420 are extended and rotated to the side close to the soil, so that the root cutting operation can be completed without interfering with the cutting knife 200.

[0064] In this embodiment, the telescopic part cooperates with the first track and the second track so that after the cutting is completed, the cutting line can extend into the gap cut by the cutting knife for a certain length, and then the telescopic part reaches the set length and completes the cutting by moving along the first track, thereby cutting five sides of the soil without damaging other uncut positions of the soil. It is suitable for relatively scarce experimental fields and other high-value farmland.

[0065] Specifically, the first telescopic member 410 and the second telescopic member 420 are telescopic rods, and the telescopic length can be fixed by structures such as protrusions, slots, and buckles, and scale lines are set on the first telescopic member 410 and the second telescopic member 420 along the extended length direction thereof, so that the length of the soil sample along the third direction OZ can be determined.

[0066] See also Figure 1 and Figure 3 In one embodiment, the root cutting assembly 400 further includes a reciprocating drive mechanism 700, which includes a drive unit 710, a drive wheel 720, and an elastic member 730. The drive unit 710 is connected to the fixed cylinder 100 and drives the drive wheel 720 to rotate around the axis of the second direction OY. The cutting line 430 includes a first extension portion 431, a cutting portion 432, and a second extension portion 433 connected in sequence. The end of the first extension portion 431 away from the cutting portion 432 is connected to the drive wheel 720 and extends along the first telescopic member 410, and the second extension portion 433 extends along the second telescopic member 420. One end of the elastic member 730 is connected to the fixed cylinder 100, and the other end is connected to the end of the second extension portion 433 away from the cutting portion 432.

[0067] In one embodiment, the reciprocating drive mechanism 700 also includes a driven wheel 740 and a wire pulling head 750. The wire pulling head 750 is arranged on a side surface of the driven wheel 740 and is spaced apart from the axis of the driven wheel 740. The driven wheel 740 is rotatably connected to the fixed cylinder 100 around the axis of the second direction OY. The driving wheel 720 drives the driven wheel 740 to rotate, and the end of the first extension portion 431 away from the cutting portion 432 is connected to the wire pulling head 750.

[0068] In this embodiment, the driving part 710 in the reciprocating drive mechanism 700 drives the driving wheel 720 to reciprocate, the driving wheel 720 drives the driven wheel 740 to reciprocate, the driven wheel 740 drives the pull wire to reciprocate around the axis of the driven wheel 740, the pull wire head 750 pulls the cutting wire 430 to move back and forth, and the elastic member 730 ensures that the cutting wire 430 is always tight, wherein the first extension portion 431 reciprocates along the extension direction of the first telescopic member 410, and the second extension portion 433 reciprocates along the extension direction of the second telescopic member 420, wherein the first telescopic member 410 may be a first extension portion 431, and the second extension portion 433 may be a second extension portion 431. 0 and the second telescopic member 420 are provided with a receiving groove 401 along the extension direction thereof, and the cutting line 430 is located in the receiving groove 401 to prevent the cutting line 430 from slipping out and being unable to be tightened. A guide wheel 440 is provided at one end of the first telescopic rod and the second telescopic rod away from the fixed cylinder 100, and the two ends of the cutting part 432 are mounted on the two guide wheels 440, so as to guide the cutting part 432 to be tightened and reciprocate along the first direction OX, so that the cutting part 432 can stably reciprocate when performing the root cutting operation - cutting the last surface of the soil sample.

[0069] See also Figure 1 In one embodiment, the cutting knife 200 includes a handle 210 and a cutter head 220. The handle 210 is rotatably connected to the cutter head 220 to fold the cutter head 220, so that the cutter head 220 can be folded to the side of the handle 210 when cutting roots, thereby freeing up cutting space for the root cutting assembly 400.

[0070] See also Figure 1 In one embodiment, the cubic soil sampling device 10 further includes four stopper assemblies 800 corresponding to the four groups of cutting knives 200. The stopper assemblies 800 include a first protrusion 810, a second protrusion 820, and a stopper rod 830. The first protrusion 810 and the second protrusion 820 are respectively located on both sides of the swing direction of the cutting knives 200 and connected to the fixed cylinder 100. The two ends of the stopper rod 830 are respectively connected to the first protrusion 810 and the second protrusion 820. The cutting knives 200 are located between the outer wall of the fixed cylinder 100 and the stopper rod 830 and swing. This prevents the cutting knives 200 from swinging too far, resulting in a too long reciprocating stroke during the soil cutting process. If the stroke is too long, the maximum angle between the cutting knives 200 and the third direction OZ is too large, and the cutting force is too dispersed, thereby ensuring the cutting stability of the cutting knives 200.

[0071] Specifically, the cubic soil sampling device 10 further includes a cover plate, which covers the opening of the fixed tube 100 away from the soil. The two ends of the fixed tube 100 have square contours, that is, the overall contour of the fixed tube 100 is a rectangular parallelepiped. The driving electric breakdown is arranged on the cover plate to drive the active member 320 to rotate.

[0072] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A cubic soil sampling device, characterized in that: The cubic soil sampling device comprises: Fixed cylinder; Four groups of cutting knives, wherein two groups of the cutting knives are respectively arranged on both sides of the fixed tube along a first direction and can swing around the axis of the first direction, and the other two groups of the cutting knives are respectively arranged on both sides of the fixed tube along a second direction and can swing around the axis of the second direction; A driving assembly, used for driving the four groups of cutting knives to swing around their respective corresponding axes; A root cutting assembly comprises a first connecting member, a second connecting member and a cutting line; the two ends of the cutting line along the first direction are respectively connected to one end of the first connecting member and one end of the second connecting member, and the other end of the first connecting member and the other end of the second connecting member are respectively connected to the two sides of the fixed tube along the first direction for rotation; when the root cutting assembly rotates around the axis of the first direction, the cutting line can bypass the side of the cutting knife away from the fixed tube along the third direction, so that the cutting line rotates from one side of the fixed tube along the second direction to the other side; the first direction, the second direction and the third direction are perpendicular to each other, and the third direction is the axial direction of the fixed tube.

2. The cubic soil sampling device according to claim 1, characterized in that: The driving assembly includes a power unit, an active member and four driven members. The power unit is connected to the fixed cylinder and drives the active member to rotate around the axis of the third direction. The four driven members are coaxially arranged and connected to the four groups of cutting knives respectively. The active member is used to drive the four driven members to rotate around their axes.

3. The cubic soil sampling device according to claim 2, characterized in that: The cubic soil sampling device further comprises four swing assemblies, and the four swing assemblies, the four sets of cutting knives and the four followers correspond to each other one by one; The swing assembly includes a crank wheel, a connecting rod, a swing part, a first shaft, a second shaft and a third shaft, the third shaft is passed through the side wall of the fixed cylinder and the two ends are respectively connected to the crank wheel and the driven member, the third shaft, the crank wheel and the driven member are coaxially arranged, the swing part is rotatably connected to the side wall of the fixed cylinder, the first shaft is passed through one end of the connecting rod and the crank wheel, and the second shaft is passed through the other end of the connecting rod and the swing part; The connecting rod is rotatably connected to the crank wheel around the axis of the first shaft, and the first shaft and the third shaft are arranged in parallel and spaced apart; the connecting rod is rotatably connected to the swing part around the axis of the second shaft, and the second shaft and the rotation axis of the swing part are arranged in parallel and spaced apart.

4. The cubic soil sampling device according to claim 1, characterized in that: The cubic soil sampling device further comprises two first rails and two sliding members, wherein the two first rails are respectively connected to the two sides of the fixing tube along the first direction and extend along the second direction; Two ends of the root cutting assembly are rotatably connected to the two sliding members respectively, and the two sliding members are slidably connected to the two first rails respectively along the second direction.

5. The cubic soil sampling device according to claim 4, characterized in that: The cubic soil sampling device further comprises two sets of second tracks, the two sets of second tracks are respectively connected to the two sides of the fixing tube along the first direction and extend along the third direction; The two first rails are respectively connected to the two groups of the second rails in a sliding manner along the third direction.

6. The cubic soil sampling device according to claim 1, characterized in that: The first connecting member is a first telescopic member, and the second connecting member is a second telescopic member; The two ends of the cutting line are respectively connected to the first telescopic member and the second telescopic member, and one end of the first telescopic member is rotatably connected to one side of the fixing tube along the first direction; One end of the second telescopic member is rotatably connected to the other side of the fixing tube along the first direction, and the first telescopic member and the second telescopic member are respectively located on both sides of the cutting knife along the first direction.

7. The cubic soil sampling device according to claim 6, characterized in that: The root cutting assembly further comprises a reciprocating drive mechanism, wherein the reciprocating drive mechanism comprises a driving portion, a driving wheel and an elastic member; The driving part is connected to the fixed cylinder and drives the driving wheel to rotate around the axis of the second direction; the cutting line includes a first extension part, a cutting part and a second extension part connected in sequence, the end of the first extension part away from the cutting part is connected to the driving wheel and extends along the first telescopic part, and the second extension part extends along the second telescopic part; one end of the elastic part is connected to the fixed cylinder, and the other end is connected to an end of the second extension part away from the cutting part.

8. The cubic soil sampling device according to claim 7, characterized in that: The reciprocating drive mechanism also includes a driven wheel and a wire pulling head. The wire pulling head is arranged on a side surface of the driven wheel and is spaced apart from the axis of the driven wheel. The driven wheel is rotatably connected to the fixed cylinder around the axis of the second direction. The driving wheel drives the driven wheel to rotate, and the end of the first extension portion facing away from the cutting portion is connected to the wire pulling head.

9. The cubic soil sampling device according to claim 1, characterized in that: The cutting knife comprises a knife handle and a knife head, wherein the knife handle is rotatably connected to the knife head so as to fold the knife head.

10. The cubic soil sampling device according to claim 1, characterized in that: The cubic soil sampling device also includes four limit assemblies corresponding to the four groups of cutting knives one by one, and the limit assemblies include a first protrusion, a second protrusion and a limit rod. The first protrusion and the second protrusion are respectively located on both sides of the swinging direction of the cutting knife and are connected to the fixed tube. The two ends of the limit rod are respectively connected to the first protrusion and the second protrusion. The cutting knife is located between the outer wall of the fixed tube and the limit rod and swings.

Images