An automatic sampling device for detecting bulk density of saline-alkali soil

Abstract

The present invention relates to the technical field of soil sampling equipment, and specifically discloses an automatic sampling device for bulk density detection of saline-alkali soil, including a mounting frame, wherein two mounting frames are symmetrically arranged, and the tops of the two mounting frames are fixedly clamped with cover plates. In the process of sampling the soil, the protective tube is always buckled on the outside of the sampling tube, thereby greatly reducing the possibility of dust being raised when collecting the soil, which can not only protect the staff from dust pollution, but also facilitate the staff to observe the sampling status at all times. The cover plate and the mounting frame are connected by a clamping type, and the turntable and the sampling tube are also connected by a clamping type, that is, the sampling tube can be removed separately after the sampling is completed to dry the saline-alkali soil inside it, eliminating the operation of taking out the saline-alkali soil, and the obtained soil will not be scattered. The integrity of the sampled soil can also be guaranteed, making the data of subsequent bulk density detection more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of soil sampling equipment, in particular to an automatic sampling device for detecting bulk density of saline-alkali soil. Background Art

[0002] Saline-alkali soil is a general term for saline soil and alkaline soil. Saline soil (solonchak) and alkaline soil (solonetz) refer to soils that contain soluble salts and have a high salt concentration, which directly inhibits or harms plant growth.

[0003] In the field of saline-alkali soil bulk density testing, traditional soil sampling methods mainly rely on manual operations, which have multiple technical challenges and limitations. First, manual sampling is inefficient, labor-intensive, and it is difficult to ensure the consistency and accuracy of sampling. Secondly, during the sampling process, due to the lack of effective protective measures, operators are easily contaminated by raised dust, which not only affects the health of the staff, but may also cause cross-contamination during the sampling process. In addition, traditional sampling equipment often has difficulty maintaining the integrity of soil samples when taking out soil samples, which directly affects the accuracy of subsequent bulk density testing.

[0004] In addition, the existing automatic sampling equipment is often complex in structure design, which not only increases the manufacturing cost of the equipment, but also increases the difficulty of equipment maintenance. Therefore, it is an urgent need in this field to develop an automatic sampling device with simple structure, convenient operation and easy maintenance. This device needs to be able to reduce manual labor while improving the efficiency and accuracy of sampling, while protecting operators from environmental pollution and ensuring that the soil samples obtained will not be scattered or damaged during the extraction process, so that the subsequent bulk density test can obtain more accurate data. Summary of the invention

[0005] The present invention provides an automatic sampling device for detecting bulk density of saline-alkali soil, which solves the problems mentioned in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an automated sampling device for saline-alkali soil bulk density detection, comprising a mounting frame, two mounting frames are symmetrically arranged, the tops of the two mounting frames are fixedly connected with cover plates, and the bottoms of the two mounting frames are fixedly connected with connecting rings, and also includes:

[0007] A sampling mechanism, the sampling mechanism is fixedly connected to the mounting frame, and the sampling mechanism is used to collect samples of saline-alkali soil;

[0008] A matching mechanism, wherein the matching mechanism is movably installed inside the sampling mechanism, the matching mechanism is used to cooperate with the sampling mechanism to work, and the matching mechanism is also used to apply a lubricant;

[0009] The sampling mechanism comprises a connecting rod, wherein two connecting rods are provided, the bottoms of the two connecting rods are symmetrically fixedly connected to the side surface of the cover plate, the tops of the two connecting rods are fixedly connected to a fixing plate, one end of the fixing plate away from the connecting rod is fixedly connected to a motor, the output end of the motor is rotatably connected to a rotating shaft, one end of the rotating shaft away from the motor passes through and is rotatably connected to the upper surface of the cover plate, and the end of the rotating shaft away from the motor is fixedly connected to a turntable.

[0010] A clamping groove is provided on the surface of one side of the turntable away from the cover plate, and four clamping grooves are arranged at fixed intervals around the central axis of the turntable. A clamping strip is fixedly clamped in the clamping groove, and the clamping strip is set as a magnet strip. A sampling tube is fixedly connected to the surface of the clamping strip on the side away from the clamping groove.

[0011] Preferably, the end of the sampling tube away from the clamping strip passes through a connecting ring, and pressure relief holes are symmetrically opened on the top outer surface of the sampling tube. A protective tube is slidably sleeved on the middle outer surface of the sampling tube, and the bottom of the protective tube and the bottom of the sampling tube are arranged at the same horizontal plane.

[0012] Preferably, the outer surface of the protective tube is symmetrically provided with sliding grooves, the sliding grooves are arranged in a straight line, a slider is elastically slidably connected up and down in the sliding groove, a limiting groove is provided on the inner surface of the connecting ring, the limiting groove is arranged in a ring shape, and the slider is slidably connected in the limiting groove on the side away from the sliding groove.

[0013] Preferably, the slider is initially arranged on the top of the slide slot, the outer surface of the protection tube abuts against the inner surface of the connecting ring, the bottom outer surface of the protection tube is fixedly connected with an isolation plate, and the isolation plate is arranged in a ring shape. When it is necessary to collect samples of saline-alkali soil, the device can be moved to the designated sampling location through the mounting frame, and the device can be placed vertically facing the ground so that the bottom of the protection tube abuts against the ground, and then the motor is started, and the mounting frame is pushed downward to complete the sampling of the saline-alkali soil through the sampling tube. When the motor is started, it will drive the rotating shaft to rotate, and then drive the turntable to rotate, and the bottom of the turntable A card strip is fixedly connected in the card slot of the upper part, and the card strip is fixedly installed on the top of the sampling tube, so the sampling tube will be driven to rotate after the motor is started. At this time, as the mounting bracket is pushed downward, the sampling tube can be continuously drilled into the ground during the rotation process to achieve sampling of saline-alkali soil. Since a protective tube is sleeved on the outer surface of the sampling tube, the bottom of the protective tube always contacts the ground during the sampling process. As the mounting bracket moves downward, the connecting ring follows the slider to slide downward in the slide groove on the outer surface of the protective tube, thereby ensuring that the downward movement of the sampling tube is not blocked, thereby completing the sampling of saline-alkali soil.

[0014] Preferably, the matching mechanism includes a working groove, which is arranged in a straight line, symmetrically penetrates through the bottom outer surface of the sampling tube, the bottom of the working groove is arranged in an opening shape, and the top of the working groove is connected to be provided with an ejection groove, which is symmetrically penetrates through the middle outer surface of the sampling tube, and the ejection groove and the working groove are arranged perpendicular to each other.

[0015] Preferably, the inner surface of the sampling tube is symmetrically frictionally contacted with an inner friction strip, the inner friction strip is arranged in an arc shape, the surface of the inner friction strip close to the inner surface of the sampling tube is fixedly connected with a clamping block, the surface of the clamping block away from the inner friction strip is fixedly connected with an outer friction strip, and the outer friction strip slides and frictionally contacts the outer surface of the sampling tube.

[0016] Preferably, the inner friction strip and the outer friction strip are initially arranged at the bottom of the sampling tube, a first liquid storage tank is opened inside the outer friction strip, a first mounting groove is penetrated through the inner surface of the outer friction strip, the first mounting groove is connected with the first liquid storage tank, a sponge board is fixedly connected inside the first mounting groove, a second liquid storage tank is opened inside the inner friction strip, a second mounting groove is penetrated through the inner surface of the inner friction strip, the second mounting groove is connected with the second liquid storage tank, a sponge board is fixedly connected inside the second mounting groove, a connecting groove is penetrated through the interior of the card block, and both sides of the connecting groove are respectively connected with the first liquid storage tank and the second liquid storage tank.

[0017] Preferably, an infusion tube is fixedly connected to the outer surface of the outer friction strip, the infusion tube is connected to the first liquid storage tank, the end of the infusion tube away from the outer friction strip passes through the bottom outer surface of the protective tube, the middle outer surface of the outer friction strip is fixedly connected to a first alignment plate, the surface of the first alignment plate away from the side of the outer friction strip is symmetrically fixedly connected to an elastic plate, the end of the elastic plate away from the first alignment plate is fixedly connected to a second alignment plate, the second alignment plate is fixedly connected to the bottom inner surface of the protective tube, and lubricant is input into the first liquid storage tank through the infusion tube in advance. When the sampling tube rotates and moves downward to sample saline-alkali soil, it will also drive the inner friction strip on its bottom inner surface to rotate, and the inner friction strip is fixedly connected to the outer friction strip through a block, that is, when sampling, When the tube rotates, there is no relative rotation between the inner friction strip, the outer friction strip and the sampling tube, and the sampling tube can only move up and down through the working groove at the bottom of the sampling tube. The outer surface of the outer friction strip is fixedly connected with a first alignment plate, and the first alignment plate is fixedly connected to the second alignment plate through an elastic plate. Since the second alignment plate is fixedly connected to the bottom inner surface of the protective tube, when the sampling tube rotates and moves downward, the protective tube will also be driven to rotate, that is, the top of the protective tube will rotate between the slider and the sliding groove on the connecting ring, so that when there is a misalignment between the sampling tube and the protective tube, the protective tube will also rotate at the same time, so that the protective tube will rotate upward when the sampling tube rotates and moves downward, so that the inner friction strip and the outer friction strip move upward along the working groove on the sampling tube.

[0018] The present invention provides an automatic sampling device for detecting bulk density of saline-alkali soil, which has the following beneficial effects:

[0019] 1. In the automatic sampling device for bulk density detection of saline-alkali soil, the protective tube is always buckled on the outside of the sampling tube during the soil sampling process, thereby greatly reducing the possibility of dust being raised when collecting the soil, which can not only protect the staff from dust pollution, but also facilitate the staff to observe the sampling status at all times. The cover plate and the mounting frame are connected by a snap-on connection, and the turntable and the sampling tube are also connected by a snap-on connection, that is, the sampling tube can be removed separately after the sampling is completed to dry the saline-alkali soil inside it, eliminating the operation of taking out the saline-alkali soil, and will not cause the obtained soil to scatter. It can also ensure the integrity of the sampled soil, making the subsequent bulk density detection data more accurate.

[0020] 2. In the automatic sampling device for bulk density detection of saline-alkali soil, lubricant is injected into the first liquid storage tank in the outer friction strip in advance, and the first liquid storage tank and the second liquid storage tank are in a connected state, that is, when the inner friction strip and the outer friction strip move upward, the lubricant is automatically applied to the inner and outer surfaces of the sampling tube through the sponge plate. By applying the lubricant, the friction between the sampling tube and the soil can be reduced, so that the sampling tube can be pressed vertically into the soil more easily and smoothly, avoiding sampling deviation caused by excessive friction. At the same time, the lubricant can reduce the adhesion of soil particles to the inner wall of the sampling tube, so that after taking out the soil sample, the inner wall of the sampling tube is easy to clean, and the sample loss is reduced, thereby ensuring the accuracy of the measurement.

[0021] 3. In the automated sampling device for bulk density detection of saline-alkali soil, when the sampling tube moves to the deepest part of the ground, the inner friction strip and the outer friction strip move to the position of the ejection slot, and are ejected outward from the ejection slot by the pulling action of the elastic plate, so that after the sampling is completed, the inner friction strip and the outer friction strip automatically break away from the contact with the sampling tube, thereby making the subsequent removal of the sampling tube unobstructed, greatly improving the degree of automation of the device, and the device has a simple structure, which is not only convenient to use, but also extremely convenient to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the present invention;

[0023] Figure 2 It is a schematic diagram of the installation structure of the motor of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the connecting ring of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the turntable of the present invention;

[0026] Figure 5 It is a schematic diagram of the internal structure of the protection tube of the present invention;

[0027] Figure 6 It is a schematic diagram of the internal structure of the sampling tube of the present invention;

[0028] Figure 7 It is a schematic diagram of the structure of the inner friction strip and the outer friction strip of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the card block of the present invention.

[0030] In the figure: 1. mounting frame; 2. cover plate; 3. connecting ring; 4. sampling mechanism; 41. connecting rod; 42. fixing plate; 43. motor; 44. rotating shaft; 45. turntable; 46. clamping groove; 47. clamping strip; 48. sampling tube; 49. pressure relief hole; 410. protective tube; 411. slide groove; 412. slide block; 413. limit groove; 414. isolation plate; 5. matching mechanism; 51. working groove; 52. ejection groove; 53. inner friction strip; 54. clamping block; 55. outer friction strip; 56. first liquid storage tank; 57. first installation groove; 58. sponge plate; 59. second liquid storage tank; 510. second installation groove; 511. connecting groove; 512. infusion tube; 513. first alignment plate; 514. elastic plate; 515. second alignment plate. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] First embodiment: Figures 1 to 8 As shown, the present invention provides a technical solution: an automated sampling device for bulk density detection of saline-alkali soil, comprising a mounting frame 1, two mounting frames 1 are symmetrically arranged, the tops of the two mounting frames 1 are fixedly connected with a cover plate 2, the bottoms of the two mounting frames 1 are fixedly connected with a connecting ring 3, and further comprising:

[0033] A sampling mechanism 4, the sampling mechanism 4 is fixedly connected to the mounting frame 1, and the sampling mechanism 4 is used to collect samples of saline-alkali soil;

[0034] A matching mechanism 5, the matching mechanism 5 is movably installed inside the sampling mechanism 4, the matching mechanism 5 is used to work with the sampling mechanism 4, and the matching mechanism 5 is also used to apply a lubricant;

[0035] The sampling mechanism 4 includes a connecting rod 41, two connecting rods 41 are provided, the bottoms of the two connecting rods 41 are symmetrically fixedly connected to the side surface of the cover 2, the tops of the two connecting rods 41 are fixedly connected to a fixing plate 42, one end of the fixing plate 42 away from the connecting rod 41 is fixedly connected to a motor 43, the output end of the motor 43 is rotatably connected to a rotating shaft 44, one end of the rotating shaft 44 away from the motor 43 penetrates and is rotatably connected to the upper surface of the cover 2, and one end of the rotating shaft 44 away from the motor 43 is fixedly connected to a turntable 45.

[0036] A snap-in groove 46 is provided on the surface of one side of the turntable 45 away from the cover plate 2. Four snap-in grooves 46 are arranged at fixed intervals around the central axis of the turntable 45. A snap-in strip 47 is fixedly snapped in the snap-in groove 46. The snap-in strip 47 is set as a magnet strip. A sampling tube 48 is fixedly connected to the surface of the snap-in strip 47 away from the snap-in groove 46.

[0037] One end of the sampling tube 48 away from the clamping strip 47 passes through the connecting ring 3, and pressure relief holes 49 are symmetrically opened on the top outer surface of the sampling tube 48. A protective tube 410 is slidably sleeved on the middle outer surface of the sampling tube 48, and the bottom of the protective tube 410 and the bottom of the sampling tube 48 are set at the same horizontal plane.

[0038] The outer surface of the protective tube 410 is symmetrically provided with sliding grooves 411, which are arranged in a straight line. A slider 412 is elastically slidably connected up and down in the sliding groove 411. A limiting groove 413 is provided on the inner surface of the connecting ring 3, and the limiting groove 413 is arranged in a ring shape. The slider 412 is slidably connected in the limiting groove 413 on the side away from the sliding groove 411.

[0039] The slider 412 is initially arranged at the top of the slide groove 411 , the outer surface of the protection tube 410 abuts against the inner surface of the connecting ring 3 , and the bottom outer surface of the protection tube 410 is fixedly connected with an isolation plate 414 , which is arranged in a ring shape.

[0040] During operation, when it is necessary to collect samples of saline-alkali soil, the device can be moved to the designated sampling location through the mounting frame 1, and the device can be placed vertically facing the ground so that the bottom of the protective tube 410 contacts the ground, and then the motor 43 is started, and the mounting frame 1 is pushed downward to complete the sampling of the saline-alkali soil through the sampling tube 48. When the motor 43 is started, the rotating shaft 44 is driven to rotate, and then the turntable 45 is driven to rotate. The clamping groove 46 at the bottom of the turntable 45 is fixedly clamped with a clamping strip 47, and the clamping strip 47 is fixedly installed on the top of the sampling tube 48. Therefore, after the motor 43 is started, the sampling tube 48 is driven to rotate. At this time, as the mounting frame 1 is pushed downward, the sampling tube 48 can be continuously drilled into the ground during the rotation process to achieve the sampling of the saline-alkali soil. Since the outer surface of the sampling tube 48 is sleeved with the protective tube 410, the bottom of the protective tube 410 always contacts the ground during the sampling process, thereby As the mounting frame 1 moves downward, the connecting ring 3 will follow the slider 412 to slide downward in the slide groove 411 on the outer surface of the protective tube 410, thereby ensuring that the downward movement of the sampling tube 48 is not blocked, thereby completing the sampling of the saline-alkali soil. In the process of sampling the soil, the protective tube 410 is always buckled on the outside of the sampling tube 48, thereby greatly reducing the possibility of dust being raised when collecting the soil. It can not only protect the staff from dust pollution, but also facilitate the staff to observe the sampling status at all times. The cover plate 2 and the mounting frame 1 adopt a snap-on connection, and the turntable 45 and the sampling tube 48 also adopt a snap-on connection, that is, the sampling tube 48 can be removed separately after the sampling is completed to dry the saline-alkali soil inside it, eliminating the operation of taking out the saline-alkali soil, and will not cause the obtained soil to scatter. It can also ensure the integrity of the sampled soil, making the subsequent bulk density test data more accurate.

[0041] Second embodiment: Figures 1 to 8 As shown, the matching mechanism 5 includes a working groove 51, which is arranged in a straight line. The working groove 51 symmetrically penetrates the bottom outer surface of the sampling tube 48, and the bottom of the working groove 51 is arranged in an open shape. The top of the working groove 51 is connected to a pop-up groove 52, which symmetrically penetrates the middle outer surface of the sampling tube 48, and the pop-up groove 52 and the working groove 51 are arranged perpendicular to each other.

[0042] The inner surface of the sampling tube 48 is symmetrically frictionally contacted with an inner friction strip 53, which is arranged in an arc shape. The surface of the inner friction strip 53 close to the inner surface of the sampling tube 48 is fixedly connected with a clamping block 54, and the surface of the clamping block 54 away from the inner friction strip 53 is fixedly connected with an outer friction strip 55. The outer friction strip 55 slides and frictionally contacts the outer surface of the sampling tube 48.

[0043] The inner friction strip 53 and the outer friction strip 55 are initially arranged at the bottom of the sampling tube 48. A first liquid storage tank 56 is opened inside the outer friction strip 55. A first mounting groove 57 is penetrated through the inner surface of the outer friction strip 55. The first mounting groove 57 is communicated with the first liquid storage tank 56. A sponge plate 58 is fixedly connected to the first mounting groove 57. A second liquid storage tank 59 is opened inside the inner friction strip 53. A second mounting groove 510 is penetrated through the inner surface of the inner friction strip 53. The second mounting groove 510 is communicated with the second liquid storage tank 59. A sponge plate 58 is fixedly connected to the second mounting groove 510. A connecting groove 511 is penetrated through the interior of the block 54. The two sides of the connecting groove 511 are respectively communicated with the first liquid storage tank 56 and the second liquid storage tank 59.

[0044] An infusion tube 512 is fixedly connected to the outer surface of the outer friction strip 55, and the infusion tube 512 is connected to the first liquid storage tank 56. The end of the infusion tube 512 away from the outer friction strip 55 passes through the bottom outer surface of the protective tube 410, and the middle outer surface of the outer friction strip 55 is fixedly connected to the first alignment plate 513. The surface of the first alignment plate 513 away from the outer friction strip 55 is symmetrically fixedly connected with an elastic plate 514. The end of the elastic plate 514 away from the first alignment plate 513 is fixedly connected to the second alignment plate 515, and the second alignment plate 515 is fixedly connected to the bottom inner surface of the protective tube 410.

[0045] During operation, lubricant is firstly input into the first liquid storage tank 56 through the liquid infusion tube 512. When the sampling tube 48 rotates and moves downward to sample the saline-alkali soil, the inner friction strip 53 on the inner surface of the bottom thereof will also be driven to rotate. The inner friction strip 53 is fixedly connected to the outer friction strip 55 through the clamping block 54. That is, when the sampling tube 48 rotates, no relative rotation occurs between the inner friction strip 53, the outer friction strip 55 and the sampling tube 48. The sampling tube 48 can only move up and down through the working groove 51 at the bottom thereof. The outer surface of the outer friction strip 55 is fixedly connected to the first alignment plate 513, and the first alignment plate 513 is elastically connected to the outer surface of the outer friction strip 55. The plate 514 is fixedly connected to the second alignment plate 515, and the second alignment plate 515 is fixedly connected to the inner surface of the bottom of the protection tube 410. Therefore, when the sampling tube 48 rotates and moves downward, the protection tube 410 is also driven to rotate, that is, the top of the protection tube 410 is rotated between the slider 412 and the slide groove 411 on the connecting ring 3, so that when the sampling tube 48 and the protection tube 410 are misaligned, the protection tube 410 is also rotated at the same time, so that when the sampling tube 48 rotates and moves downward, the protection tube 410 is rotated upward, so that the inner friction strip 53 and the outer friction strip 55 are moved along the inner friction strip 53 and the outer friction strip 55. As the working groove 51 on the sampling tube 48 moves upward, the lubricant is pre-injected into the first liquid storage tank 56 in the outer friction strip 55, and the first liquid storage tank 56 and the second liquid storage tank 59 are in a connected state, that is, when the inner friction strip 53 and the outer friction strip 55 move upward, the lubricant is automatically applied to the inner and outer surfaces of the sampling tube 48 through the sponge plate 58. By applying the lubricant, the friction between the sampling tube 48 and the soil can be reduced, so that the sampling tube 48 can be pressed vertically into the soil more easily and more steadily, avoiding sampling deviation caused by excessive friction. At the same time, the lubricant can reduce the adhesion of soil particles to the inner wall of the sampling tube 48. , so that after taking out the soil sample, the inner wall of the sampling tube 48 is easy to clean, and the sample loss is reduced, ensuring the accuracy of the measurement. When the sampling tube 48 moves to the deepest part of the ground, the inner friction strip 53 and the outer friction strip 55 move to the position of the ejection groove 52, and are ejected from the ejection groove 52 to the outside through the pulling action of the elastic plate 514, that is, after the sampling is completed, the inner friction strip 53 and the outer friction strip 55 automatically break away from the contact with the sampling tube 48, so that the subsequent removal of the sampling tube 48 is not hindered, which greatly improves the automation degree of the device, and the device has a simple structure, which is not only convenient to use, but also extremely convenient to maintain.

[0046] 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. In the absence of further restrictions. The sentence "includes an element defined by... does not exclude the existence of other identical elements in the process, method, article or device including the element".

Claims

1. An automated sampling device for detecting bulk density of saline-alkali soil, comprising a mounting frame (1), characterized in that: The mounting frames (1) are symmetrically arranged with two of them, the tops of the two mounting frames (1) are fixedly clamped with cover plates (2), the bottoms of the two mounting frames (1) are fixedly connected with connecting rings (3), and further comprising: A sampling mechanism (4), the sampling mechanism (4) being fixedly connected to the mounting frame (1), and the sampling mechanism (4) being used to collect samples of saline-alkali soil; A matching mechanism (5), wherein the matching mechanism (5) is movably mounted inside the sampling mechanism (4), the matching mechanism (5) is used to cooperate with the sampling mechanism (4) to work, and the matching mechanism (5) is also used to apply a lubricant; The sampling mechanism (4) comprises a connecting rod (41), wherein two connecting rods (41) are provided, the bottoms of the two connecting rods (41) are symmetrically fixedly connected to the side surface of the cover plate (2), the tops of the two connecting rods (41) are fixedly connected to a fixing plate (42), one end of the fixing plate (42) away from the connecting rod (41) is fixedly connected to a motor (43), the output end of the motor (43) is rotatably connected to a rotating shaft (44), one end of the rotating shaft (44) away from the motor (43) penetrates and is rotatably connected to the upper surface of the cover plate (2), and one end of the rotating shaft (44) away from the motor (43) is fixedly connected to a rotating disk (45); A clamping groove (46) is provided on a surface of a side of the rotating disk (45) away from the cover plate (2), four clamping grooves (46) are arranged at fixed intervals around the central axis of the rotating disk (45), a clamping strip (47) is fixedly clamped in the clamping groove (46), the clamping strip (47) is configured as a magnet strip, and a sampling tube (48) is fixedly connected to a surface of a side of the clamping strip (47) away from the clamping groove (46); One end of the sampling tube (48) away from the clamping strip (47) is arranged to penetrate the connecting ring (3), and a pressure relief hole (49) is symmetrically opened through the top outer surface of the sampling tube (48). A protective tube (410) is slidably sleeved on the middle outer surface of the sampling tube (48), and the bottom of the protective tube (410) and the bottom of the sampling tube (48) are arranged at the same horizontal plane; The outer surface of the protection tube (410) is symmetrically provided with sliding grooves (411), the sliding grooves (411) are arranged in a straight line, a slider (412) is elastically slidably connected up and down in the sliding groove (411), a limiting groove (413) is provided on the inner surface of the connecting ring (3), the limiting groove (413) is arranged in a ring shape, and the slider (412) is slidably connected in the limiting groove (413) at a side away from the sliding groove (411); The sliding block (412) is initially arranged at the top of the sliding groove (411), the outer surface of the protection tube (410) abuts against the inner surface of the connecting ring (3), and the bottom outer surface of the protection tube (410) is fixedly connected with an isolation plate (414), and the isolation plate (414) is arranged in a ring shape; The matching mechanism (5) comprises a working groove (51), the working groove (51) is arranged in a straight line, the working groove (51) symmetrically penetrates and is opened on the bottom outer surface of the sampling tube (48), the bottom of the working groove (51) is arranged in an open shape, and the top of the working groove (51) is connected to and is provided with an ejection groove (52), the ejection groove (52) symmetrically penetrates and is opened on the middle outer surface of the sampling tube (48), and the ejection groove (52) and the working groove (51) are arranged perpendicular to each other; The inner surface of the sampling tube (48) is symmetrically frictionally contacted with an inner friction strip (53), the inner friction strip (53) being arranged in an arc shape, a clamping block (54) being fixedly connected to a surface of the inner friction strip (53) close to the inner surface of the sampling tube (48), an outer friction strip (55) being fixedly connected to a surface of the clamping block (54) away from the inner friction strip (53), the outer friction strip (55) being slidingly frictionally contacted with an outer surface of the sampling tube (48); The inner friction strip (53) and the outer friction strip (55) are initially arranged at the bottom of the sampling tube (48); a first liquid storage tank (56) is provided inside the outer friction strip (55); a first installation slot (57) is provided through the inner surface of the outer friction strip (55); the first installation slot (57) is communicated with the first liquid storage tank (56); a sponge plate (58) is fixedly connected inside the first installation slot (57); a second liquid storage tank (59) is provided inside the inner friction strip (53); a second installation slot (510) is provided through the inner surface of the inner friction strip (53); the second installation slot (510) is communicated with the second liquid storage tank (59); a sponge plate (58) is fixedly connected inside the second installation slot (510); a connecting slot (511) is provided through the inner surface of the clamping block (54); two sides of the connecting slot (511) are respectively communicated with the first liquid storage tank (56) and the second liquid storage tank (59).

2. The automatic sampling device for saline-alkali soil bulk density detection according to claim 1, characterized in that: An infusion tube (512) is fixedly connected to the outer surface of the outer friction strip (55), the infusion tube (512) is communicated with the first liquid storage tank (56), one end of the infusion tube (512) away from the outer friction strip (55) passes through the outer surface of the bottom of the protective tube (410), a first alignment plate (513) is fixedly connected to the middle outer surface of the outer friction strip (55), an elastic plate (514) is symmetrically fixedly connected to the surface of the first alignment plate (513) away from the outer friction strip (55), one end of the elastic plate (514) away from the first alignment plate (513) is fixedly connected to the second alignment plate (515), and the second alignment plate (515) is fixedly connected to the inner surface of the bottom of the protective tube (410).

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