Soil stratified sampling device

Abstract

The invention discloses a soil stratified sampling device and belongs to the field of geological survey, the soil stratified sampling device comprises a stratified positioning table and a soil drilling rod, the stratified positioning table comprises a top plate, the soil drilling rod is slidably arranged on the inner side of the top plate, a circular groove is formed in the top of the top plate, a planetary gear ring is arranged on the inner wall of the circular groove, and a transmission mechanism is rotatably arranged in the center of the circular groove; a positioning gear is arranged between the transmission mechanism and the planetary gear ring, an indicating mechanism is arranged above the positioning gear, multiple groups of positioning grooves are formed in the outer wall of the circular groove along the outer wall of the circular groove, a triggering mechanism is arranged in each positioning groove in a sliding mode, and an auxiliary rod is further arranged on the side wall of the soil drilling rod. According to the soil sampling device, soil of different layer sections can be more flexibly sampled in a layered mode, secondary collection is not needed, samples are stored in the sampling barrel, the size is small, and transferring and taking are convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of geological survey, and in particular relates to a soil stratification sampling device. Background Art

[0002] Soil sampling can intuitively reflect information such as soil structure, composition, texture and pollution status. In operation, it is often necessary to sample soil at different depths to obtain geological information of different layers. Conventional soil sampling methods usually use direct-push coring drill rods to sample soil. This method is to insert a hollow metal tube directly into the soil through an external drive device, so that the soil at the sampling point enters the metal tube, and then pull the metal tube upward through an external drive device to completely remove the soil sample. This is the most direct and convenient soil sampling method, but it is not flexible enough in use. Each sampling requires all soil from the surface of the sampling point to the target depth to be removed, and after the sample is removed, the metal tube needs to be disassembled and the required sample needs to be collected again. At the same time, in some usage scenarios, the amount of soil sample required is far less than the amount of soil removed, which will cause soil waste. Therefore, a more flexible soil sampling device is needed. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a soil layered sampling device, which can more flexibly perform layered sampling of soil in different layers.

[0004] The technical solution adopted by the present invention is as follows: A soil stratified sampling device provided by the present invention includes a stratified positioning platform and a soil drilling rod, the stratified positioning platform includes a top plate, the soil drilling rod is slidably arranged on the inner side of the top plate, a circular groove is opened on the top of the top plate, a planetary gear ring is arranged on the inner wall of the circular groove, a transmission mechanism is arranged for rotation at the center of the circular groove, a positioning gear is arranged between the transmission mechanism and the planetary gear ring, an indicating mechanism is arranged above the positioning gear, a positioning groove is arranged on the outer wall of the circular groove, and a plurality of positioning grooves are arranged along the outer wall of the circular groove, a trigger mechanism is arranged for sliding in the positioning groove, and an auxiliary rod is also arranged on the side wall of the soil drilling rod.

[0005] Furthermore, a supporting leg is provided at the bottom of the top plate, an opening one is penetrated through the center of the circular groove, an opening two is also penetrated through the circular groove, and the opening two is arranged on one side of the opening, a supporting rod is provided above the circular groove, a roller is rotatably provided at the end of the supporting rod, and an active bevel gear is provided on the side of the roller close to the opening one.

[0006] Furthermore, the transmission mechanism rotates and includes a center tube, an annular groove, a passive bevel gear and a driving gear. The center tube is hollow, and the center tube is rotatably clamped directly above opening one. The inner diameter of the center tube is the same as the inner diameter of opening one. The annular groove is opened on the side wall of the center tube, the passive bevel gear is arranged at the top end of the side wall of the center tube, and the driving gear is arranged at the bottom end of the side wall of the center tube.

[0007] Furthermore, the positioning gear includes a passive gear and a clamping shaft, the clamping shaft is arranged on the top wall of the passive gear, the positioning gear is arranged between the active gear and the planetary gear ring, and the passive gear is meshed with the active gear and the planetary gear ring respectively.

[0008] Furthermore, the indicating mechanism includes an indicating rod, a ring and a through hole, the indicating rod is arranged above the passive gear, the through hole is arranged on the indicating rod, the clamping shaft is arranged on the inner side of the through hole, the clamping shaft is fitted with the through hole, the ring is arranged at one end of the indicating rod close to the opening one, the ring is sleeved in the annular groove, and the length of the indicating rod is greater than the distance from the opening one to the positioning groove.

[0009] Furthermore, the trigger mechanism includes a slider and a trigger switch, the slider is slidably arranged in the positioning groove, the slider and the positioning groove are interference fit, and the trigger switch is arranged on the top of the slider.

[0010] Furthermore, the drilling rod includes a sleeve, a transmission rod and a spiral drill bit, the sleeve is slidably arranged in the second opening, the transmission rod is rotatably arranged on the inner side of the sleeve, the spiral drill bit is arranged at the bottom end of the transmission rod, the side wall of the sleeve is provided with a slot one, and a side wall of the slot is provided with a fixing bolt, and the fixing bolt passes through a side wall of the slot, wherein the top end of the transmission rod is externally connected to a driving device.

[0011] Furthermore, the auxiliary rod is arranged on the side of the drilling rod, and the auxiliary rod includes a driving rod and a sampling tube. The driving rod is arranged on the side of the drilling rod, the top of the drilling rod is fixedly connected to the driving rod, and the sampling tube is arranged below the driving rod.

[0012] Furthermore, the driving rod includes a threaded barrel, a screw rod 1, a clamping rod and a driving motor. The bottom of the threaded barrel is open, the screw rod 1 is rotatably arranged on the inner side of the threaded barrel, the driving motor is arranged at the top of the threaded barrel, the top wall of the screw rod 1 is provided with a slot 2, and the bottom of the top wall of the threaded barrel is rotatably provided with a clamping rod, the clamping rod is inserted into the slot 2, the clamping rod is engaged with the slot 2, the output end of the driving motor is transmission-connected with the clamping rod, the bottom wall of the screw rod 1 is provided with a threaded groove, the driving motor is connected to the trigger switch signal, and the bottom end of the threaded barrel is provided with a smooth section without a threaded inner wall.

[0013] Furthermore, the sampling barrel comprises a collecting barrel and a stratified sampling rod, the collecting barrel is arranged below the driving rod, the stratified sampling rod is slidably arranged in the collecting barrel, the top of the collecting barrel is open, the side wall of the collecting barrel is provided with a sampling window, a cover plate is provided in the sampling window, the cover plate is detachable, the bottom wall of the collecting barrel is telescopically provided with a blocking block, and the blocking block can rebound after the pressure is removed, the stratified sampling rod comprises a central rod, the top of the central rod is provided with a screw rod 2, the side wall of the central rod is provided with a linear array of dividing blocks, the dividing block is fitted with the inner wall of the collecting barrel, the bottom wall of the dividing block at the bottom end is provided with a slot, the slot and the blocking block are engaged with each other, wherein the height of the blocking block is slightly greater than the height of the sampling window, in the initial state, the dividing block at the top is flush with the sampling window to block the sampling window, the dividing block at the bottom end is fitted with the bottom wall of the collecting barrel, the blocking block is located in the slot, and the dividing block is fitted with the inner wall of the smooth section at the bottom end of the threaded barrel.

[0014] The beneficial effects achieved by the present invention using the above structure are as follows: In the soil stratified sampling device provided by the present scheme, during the sampling operation, the cover plate is first removed, and under the drive of the external driving device, the spiral drill bit drills into the soil downward, and at the same time, the sleeve drives the auxiliary rod to move downward together. During the downward movement, the side wall of the sleeve drives the roller to rotate, and under the transmission action of the active bevel gear, the passive bevel gear, the active gear, the passive gear and the planetary gear ring, the displacement distance of the drilling rod can be converted into the rotation angle of the indicating mechanism, so that the depth of the spiral drill bit can be visualized, so that the staff can observe the current depth of the spiral drill bit more intuitively. At the same time, the positioning grooves evenly arranged along the side walls of the circular groove can play a marking role. The corresponding positioning groove is selected according to the depth of the target soil sample, and the trigger mechanism inside it is toggled upward. When the indicating rod passes through the positioning groove corresponding to the depth of the target soil sample, the trigger switch is pressed to drive the motor to rotate, so that the screw rod rises and the sample is divided. The layer sampling rod is pulled upward by the distance between the partition blocks. When the partition blocks pass through the sampling window, the soil near the sampling window enters between the partition blocks. Then the driving motor continues to drive the layered sampling rod to move upward a distance equal to the height of a single partition block. The next partition block seals the sampling window to seal the soil sample. This method can store soil samples from different layers separately and can flexibly sample according to different target soil sample depths without taking out all the soil at once. At the same time, after the sampling is completed, the depth of the soil samples between each partition block is recorded, and the drilling rod is pulled upward by an external driving device. After unearthed, the sampling window is sealed through the cover plate, and the driving motor is controlled to move the screw down to reinsert the layered sampling rod into the collecting tube. After turning the fixing bolt to loosen it, the collecting tube can be rotated to remove it, completing the sample collection without the need for secondary collection. The samples are stored in the sampling tube, which is small in size and easy to transport and take. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a soil layer sampling device provided by the present invention; Figure 2 A schematic diagram of the structure of a soil layer sampling device provided by the present invention without the soil drilling rod and the auxiliary rod; Figure 3 A schematic diagram of the structure of the layered positioning platform provided by the present invention; Figure 4 for Figure 3 A partial enlarged view of part A in FIG. Figure 5 A schematic diagram of the structure of the transmission mechanism provided by the present invention; Figure 6 A schematic diagram of the structure of the indicating mechanism provided by the present invention; Figure 7 A schematic diagram of the structure of the positioning gear provided by the present invention; Figure 8 A schematic diagram of the structure of the soil drilling rod and the auxiliary rod provided by the present invention; Fig. 9 A schematic diagram of the structure of the driving rod provided by the present invention; Fig.10 This is a schematic structural diagram of the sampling tube provided by the present invention.

[0016] Among them, 1. layered positioning platform, 2. transmission mechanism, 3. indicating mechanism, 4. positioning gear, 5. trigger mechanism, 6. soil drilling rod, 7. auxiliary rod, 8. driving rod, 9. sampling tube, 101. top plate, 102. circular groove, 103. planetary gear ring, 104. opening 1, 105. opening 2, 106. support rod, 107. roller, 108. active bevel gear, 109. positioning groove, 110. support leg, 201. center tube, 202. annular groove, 203. passive bevel gear, 204. active gear, 301. indicating rod, 302. collar, 303. , through hole, 401, passive gear, 402, clamping shaft, 501, slider, 502, trigger switch, 601, sleeve, 602, transmission rod, 603, spiral drill bit, 604, slot one, 605, fixing bolt, 801, threaded barrel, 802, screw one, 803, clamping rod, 804, driving motor, 805, slot two, 806, threaded groove, 901, collecting barrel, 902, sampling window, 903, clamping block, 904, layered sampling rod, 905, center rod, 906, partition block, 907, screw two, 908, clamping slot, 909, cover plate.

[0017] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0020] like Figure 1-Figure 10 As shown, a soil stratified sampling device provided by the present invention includes a stratified positioning platform 1 and a soil drilling rod 6, the stratified positioning platform 1 includes a top plate 101, the soil drilling rod 6 is slidably arranged on the inner side of the top plate 101, a circular groove 102 is opened on the top of the top plate 101, a planetary gear ring 103 is arranged on the inner wall of the circular groove 102, a transmission mechanism 2 is arranged for rotation at the center of the circular groove 102, a positioning gear 4 is arranged between the transmission mechanism 2 and the planetary gear ring 103, an indicating mechanism 3 is arranged above the positioning gear 4, a positioning groove 109 is arranged on the outer wall of the circular groove 102, a plurality of positioning grooves 109 are arranged along the outer wall of the circular groove 102, a trigger mechanism 5 is slidably arranged in the positioning groove 109, and an auxiliary rod 7 is also arranged on the side wall of the soil drilling rod 6.

[0021] Furthermore, a support leg 110 is provided at the bottom of the top plate 101, an opening 104 is penetrated through the center of the circular groove 102, and an opening 105 is also penetrated through the circular groove 102, and the opening 105 is arranged on the side of the opening 104, a support rod 106 is provided above the circular groove 102, and a roller 107 is rotatably provided at the end of the support rod 106, and an active bevel gear 108 is provided on the side of the roller 107 close to the opening 104.

[0022] Furthermore, the transmission mechanism 2 rotates and includes a center tube 201, an annular groove 202, a passive bevel gear 203 and a driving gear 204. The center tube 201 is hollow, and the center tube 201 is rotatably clamped just above the opening 104. The inner diameter of the center tube 201 is the same as the inner diameter of the opening 104. The annular groove 202 is opened on the side wall of the center tube 201, the passive bevel gear 203 is arranged at the top of the side wall of the center tube 201, and the driving gear 204 is arranged at the bottom of the side wall of the center tube 201.

[0023] Furthermore, the positioning gear 4 includes a passive gear 401 and a clamping shaft 402. The clamping shaft 402 is arranged on the top wall of the passive gear 401. The positioning gear 4 is arranged between the active gear 204 and the planetary gear ring 103. The passive gear 401 is meshed with the active gear 204 and the planetary gear ring 103 respectively.

[0024] Furthermore, the indicating mechanism 3 includes an indicating rod 301, a ring 302 and a through hole 303. The indicating rod 301 is arranged above the passive gear 401. The through hole 303 is penetrated and arranged on the indicating rod 301. The clamping shaft 402 is arranged on the inner side of the through hole 303. The clamping shaft 402 is fitted with the through hole 303. The ring 302 is arranged at one end of the indicating rod 301 close to the opening 104. The ring 302 is sleeved in the annular groove 202. The length of the indicating rod 301 is greater than the distance from the opening 104 to the positioning groove 109.

[0025] Furthermore, the trigger mechanism 5 includes a slider 501 and a trigger switch 502 . The slider 501 is slidably disposed in the positioning groove 109 . The slider 501 and the positioning groove 109 are interference fit. The trigger switch 502 is disposed on the top of the slider 501 .

[0026] Furthermore, the drilling rod 6 includes a sleeve 601, a transmission rod 602 and a spiral drill bit 603. The sleeve 601 is slidably arranged in the opening 105, the transmission rod 602 is rotatably arranged on the inner side of the sleeve 601, the spiral drill bit 603 is arranged at the bottom end of the transmission rod 602, and a slot 604 is arranged on the side wall of the sleeve 601. A fixing bolt 605 is arranged on the side wall of the slot 604. The fixing bolt 605 passes through the side wall of the slot 604, wherein the top of the transmission rod 602 is externally connected to a driving device.

[0027] Furthermore, the auxiliary rod 7 is arranged on the side of the drilling rod 6, and the auxiliary rod 7 includes a driving rod 8 and a sampling tube 9. The driving rod 8 is arranged on the side of the drilling rod 6, the top of the drilling rod 6 is fixedly connected to the driving rod 8, and the sampling tube 9 is arranged below the driving rod 8.

[0028] Furthermore, the driving rod 8 includes a threaded barrel 801, a screw rod 802, a clamping rod 803 and a driving motor 804. The bottom of the threaded barrel 801 is open, the screw rod 802 is rotatably arranged on the inner side of the threaded barrel 801, the driving motor 804 is arranged at the top of the threaded barrel 801, a slot 2 805 is provided on the top wall of the screw rod 802, and a clamping rod 803 is rotatably provided on the bottom of the top wall of the threaded barrel 801. The clamping rod 803 is inserted into the slot 2 805, and the clamping rod 803 is engaged with the slot 2 805. The output end of the driving motor 804 is transmission-connected with the clamping rod 803, the bottom wall of the screw rod 802 is provided with a threaded groove 806, the driving motor 804 is signal-connected with the trigger switch 502, and the bottom end of the threaded barrel 801 is provided with a smooth section without a threaded inner wall.

[0029] Furthermore, the sampling tube 9 includes a collecting tube 901 and a layered sampling rod 904. The collecting tube 901 is arranged below the driving rod 8. The layered sampling rod 904 is slidably arranged in the collecting tube 901. The top of the collecting tube 901 is open. The side wall of the collecting tube 901 is provided with a sampling window 902. A cover plate 909 is provided in the sampling window 902. The cover plate 909 is detachable. A block 903 is telescopically provided on the bottom wall of the collecting tube 901. The block 903 can rebound after the pressure is removed. The layered sampling rod 904 includes a central rod 905. A screw rod 907 is provided at the top of the central rod 905. The central rod 905 The side wall linear array is provided with a partition block 906, and the partition block 906 is fitted with the inner wall of the collection tube 901. The bottom wall of the partition block 906 at the bottom end is provided with a slot 908, and the slot 908 and the block 903 are engaged with each other, wherein the height of the block 903 is slightly larger than the height of the sampling window 902. In the initial state, the topmost partition block 906 is flush with the sampling window 902 to block the sampling window 902, and the bottommost partition block 906 is fitted with the bottom wall of the collection tube 901, the block 903 is located in the slot 908, and the partition block 906 is fitted with the inner wall of the smooth section at the bottom end of the threaded tube 801.

[0030] When in use, first remove the cover plate 909, rotate and loosen the fixing bolt 605, insert the sampling tube 9 from the bottom of the slot 1 604 upward, rotate the sampling tube 9, at this time, the block 903 is squeezed by the slot 908 with less pressure, and the collection tube 901 and the layered sampling rod 904 are locked as a whole under the action of the slot 908 and the block 903, so that the screw rod 2 907 is rotated and inserted into the thread groove 806 for fixing until the top wall of the collection tube 901 fits the bottom wall of the threaded tube 801, and then the fixing bolt 605 is rotated to fix the collection tube 901, and the installation is completed. Driven by the external drive device, the spiral drill bit 603 drills into the soil downward, and at the same time, the sleeve 601 drives the auxiliary rod 7 to move downward. During the downward movement, the side wall of the sleeve 601 drives the roller 107 The roller 107 drives the active bevel gear 108 to rotate, and the active bevel gear 108 drives the passive bevel gear 203 to rotate, thereby driving the active gear 204 at the bottom of the side wall of the center tube 201 to rotate. Under the action of the active gear 204 and the planetary gear ring 103, the passive gear 401 rotates and revolves around the transmission mechanism 2 under the drive of the active gear 204, and drives the upper indicating mechanism 3 to rotate. After transmission, the displacement distance of the drilling rod 6 is converted into the rotation angle of the indicating mechanism 3, so that the depth of the spiral drill bit 603 can be visualized (for different usage scenarios, it is only necessary to adjust the size of the roller 107 and the position of the opening 105 when manufacturing the equipment, adjust the corresponding rotation angle of the indicating mechanism 3 when the drilling rod 6 moves down the same distance, and The sizes of other parts can be adjusted accordingly). At the same time, the corresponding positioning groove 109 is selected according to the depth of the target soil sample, and the trigger mechanism 5 therein is pushed upward. When the indicator rod 301 passes through the positioning groove 109 corresponding to the depth of the target soil sample, the trigger switch 502 is pressed to send a signal to the drive motor 804. The drive motor 804 rotates, and the clamping rod 803 drives the screw rod 802 to rotate, so that the screw rod 802 rotates and rises along the threaded barrel 801. During the rotation, the clamping groove 908 squeezes the clamping block 903 with a greater force to temporarily retract it. The screw rod 802 pulls the stratified sampling rod 904 upward by the distance between the partition blocks 906. When the partition blocks 906 pass through the sampling window 902, the sampling window 902 is near the sampling window 902. The soil enters between the partition blocks 906, and then the driving motor 804 continues to drive the stratified sampling rod 904 to move upward a distance equal to the height of a single partition block 906. The next partition block 906 blocks the sampling window 902 to seal the soil sample. This process is repeated until the sampling of all target soil samples is completed. After the sampling is completed, the depth of the soil samples between each partition block 906 is recorded, and the drilling rod 6 is pulled out upward through an external driving device. After being unearthed, the sampling window 902 is sealed through the cover plate 909, and the driving motor 804 is controlled to move the screw 802 downward, and the stratified sampling rod 904 is reinserted into the collecting tube 901. After the fixing bolt 605 is turned to loosen it, the collecting tube 901 can be rotated to remove it, and the sample collection is completed.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A soil stratification sampling device, characterized in that: The invention comprises a layered positioning platform (1) and a soil drilling rod (6), wherein the layered positioning platform (1) comprises a top plate (101), the soil drilling rod (6) is slidably arranged on the inner side of the top plate (101), a circular groove (102) is provided on the top of the top plate (101), a planetary gear ring (103) is provided on the inner wall of the circular groove (102), a transmission mechanism (2) is provided at the center of the circular groove (102) for rotation, a positioning gear (4) is provided between the transmission mechanism (2) and the planetary gear ring (103), an indicating mechanism (3) is provided above the positioning gear (4), a positioning groove (109) is provided on the outer wall of the circular groove (102), and the positioning groove (109) is arranged along the outer wall of the circular groove (102). A plurality of groups are provided, wherein a trigger mechanism (5) is slidably provided in the positioning groove (109), an auxiliary rod (7) is also provided on the side wall of the soil drilling rod (6), a supporting leg (110) is provided at the bottom of the top plate (101), an opening (104) is provided through the center of the circular groove (102), an opening (105) is also provided through the circular groove (102), the opening (105) is arranged on the side of the opening (104), a supporting rod (106) is provided above the circular groove (102), a roller (107) is rotatably provided at the end of the supporting rod (106), and an active bevel gear (108) is provided on the side of the roller (107) close to the opening (104).

2. A soil layer sampling device according to claim 1, characterized in that: The transmission mechanism (2) rotatably comprises a central tube (201), an annular groove (202), a passive bevel gear (203) and a driving gear (204); the central tube (201) is hollow; the central tube (201) is rotatably clamped just above the first opening (104); the inner diameter of the central tube (201) is the same as the inner diameter of the first opening (104); the annular groove (202) is formed on the side wall of the central tube (201); the passive bevel gear (203) is disposed At the top end of the side wall of the central tube (201), the driving gear (204) is arranged at the bottom end of the side wall of the central tube (201), the positioning gear (4) comprises a passive gear (401) and a clamping shaft (402), the clamping shaft (402) is arranged on the top wall of the passive gear (401), the positioning gear (4) is arranged between the driving gear (204) and the planetary gear ring (103), and the passive gear (401) is meshed with the driving gear (204) and the planetary gear ring (103) respectively.

3. A soil layer sampling device according to claim 2, characterized in that: The soil drilling rod (6) comprises a sleeve (601), a transmission rod (602) and a spiral drill bit (603); the sleeve (601) is slidably arranged in the second opening (105); the transmission rod (602) is rotatably arranged inside the sleeve (601); the spiral drill bit (603) is arranged at the bottom end of the transmission rod (602); a slot one (604) is arranged on the side wall of the sleeve (601); a fixing bolt (605) is arranged on the side wall of the slot one (604); and the fixing bolt (605) passes through the side wall of the slot one (604).

4. A soil layer sampling device according to claim 3, characterized in that: The auxiliary rod (7) is arranged on the side of the soil drilling rod (6), and the auxiliary rod (7) comprises a driving rod (8) and a sampling tube (9). The driving rod (8) is arranged on the side of the soil drilling rod (6), the top end of the soil drilling rod (6) is fixedly connected to the driving rod (8), and the sampling tube (9) is arranged below the driving rod (8).

5. A soil layer sampling device according to claim 4, characterized in that: The driving rod (8) comprises a threaded barrel (801), a screw rod (802), a clamping rod (803) and a driving motor (804); the threaded barrel (801) has an opening at the bottom; the screw rod (802) is rotatably arranged inside the threaded barrel (801); the driving motor (804) is arranged at the top of the threaded barrel (801); a slot (805) is provided on the top wall of the screw rod (802); and a clamping rod (803) is rotatably arranged at the bottom of the top wall of the threaded barrel (801). Rod (803), the clamping rod (803) is inserted into the second slot (805), the clamping rod (803) is engaged with the second slot (805), the output end of the driving motor (804) is transmission-connected with the clamping rod (803), the bottom wall of the screw rod (802) is provided with a thread groove (806), the driving motor (804) and the trigger switch (502) are signal-connected, and the bottom end of the threaded barrel (801) is provided with a smooth section without a threaded inner wall.

6. A soil layer sampling device according to claim 5, characterized in that: The sampling cylinder (9) comprises a collecting cylinder (901) and a layered sampling rod (904); the collecting cylinder (901) is arranged below the driving rod (8); the layered sampling rod (904) is slidably arranged in the collecting cylinder (901); the top of the collecting cylinder (901) is open; a sampling window (902) is provided on the side wall of the collecting cylinder (901); a cover plate (909) is clamped in the sampling window (902); a clamping block (903) is telescopically provided on the bottom wall of the collecting cylinder (901); and the layered sampling rod (904) is slidably arranged in the collecting cylinder (901). (904) comprises a central rod (905), the top of the central rod (905) is provided with a second screw rod (907), the side wall of the central rod (905) is provided with a linear array of partition blocks (906), the partition blocks (906) are fitted with the inner wall of the collecting tube (901), the bottom wall of the partition block (906) at the bottom end is provided with a slot (908), the slot (908) and the block (903) are mutually engaged, and the partition block (906) is fitted with the inner wall of the smooth section at the bottom end of the threaded tube (801).

7. A soil layer sampling device according to claim 6, characterized in that: The indicating mechanism (3) comprises an indicating rod (301), a collar (302) and a through hole (303); the indicating rod (301) is arranged above the passive gear (401); the through hole (303) is penetrated through the indicating rod (301); the clamping shaft (402) is arranged inside the through hole (303); the clamping shaft (402) and the through hole (303) are fitted together; the collar (302) is arranged at one end of the indicating rod (301) close to the opening (104); the collar (302) is sleeved in the annular groove (202); and the length of the indicating rod (301) is greater than the distance from the opening (104) to the positioning groove (109).

8. A soil layer sampling device according to claim 7, characterized in that: The trigger mechanism (5) comprises a slider (501) and a trigger switch (502); the slider (501) is slidably disposed in a positioning groove (109); the slider (501) and the positioning groove (109) are interference-fitted; and the trigger switch (502) is disposed on the top of the slider (501).

Images