Sampling and liquid preparation all-in-one machine for soil salinity and alkalinity

Abstract

A soil salinity and alkalinity sampling and liquid preparation all-in-one machine relates to the technical field of soil sampling and comprises a support, a sampling rod is slidably matched in the support, a drill bit is arranged at the lower end of the sampling rod, the top of the sampling rod is connected with a driving motor through a connecting shaft, and the driving motor can drive the sampling rod to rotate. According to the invention, sampling and liquid mixing functions are integrated, multi-point convenient sampling is realized through an unmanned aerial vehicle assembly or manual carrying, accurate sampling is realized by using an electric cylinder to drive a plugging plate and an upper sealing cap, and meanwhile, the liquid mixing mechanism ensures that soil and purified water are fully mixed; the sampling efficiency and the detection accuracy are greatly improved, and an efficient and convenient solution is provided for soil salinity and alkalinity detection.

Description

Technical Field

[0001] The invention relates to the technical field of soil sampling, and in particular to a soil salinity and alkalinity sampling and liquid preparation integrated machine. Background Art

[0002] At present, in the field of soil testing, soil sampling and salinity testing are usually carried out separately, which is inefficient. Common sampling methods mainly include manual sampling and sampling using soil sampling devices. Manual sampling is more laborious and is gradually being eliminated with the development of sampling technology; and although the existing soil sampling devices are convenient and fast, when sampling some sandy soils or loose soils, soil samples are easy to slip out of the soil sampling head, and the collection effect cannot be guaranteed. On the other hand, existing soil samplers are usually unable to obtain soil solution samples, making it difficult to directly test soil salinity. People need to take samples first and then use other devices to prepare soil solutions. The operation is cumbersome and easy to contaminate the samples.

[0003] Chinese patent CN211013616U discloses a soil sampler. Although the sampler can conveniently collect soil by providing a sampling tube, it is still unable to mix the collected soil sample with an aqueous solution, and is unable to obtain a soil solution sample for salinity testing. Summary of the invention

[0004] The purpose of the present invention is to solve the problems raised in the above background technology, and then proposes a soil salinity sampling and liquid preparation integrated machine.

[0005] The technical solution adopted by the present invention to solve the technical problem is:

[0006] A soil salinity sampling and liquid preparation integrated machine comprises a bracket, a sampling rod is slidably fitted in the bracket, a drill bit is provided at the lower end of the sampling rod, a driving motor is connected to the top of the sampling rod through a connecting shaft, the driving motor can drive the sampling rod to rotate, and a sampling mechanism and a liquid mixing mechanism are provided in the sampling rod.

[0007] Furthermore, the bracket includes a circular base plate, and a plurality of extension sleeves are arranged in a circular array on the side wall of the circular base plate, an extension rod is slidably fitted in the extension sleeve, an end block is provided at the end of the extension rod, a pin is provided at the bottom of the end block, four guide rods are provided on the top of the circular base plate, a top plate is provided on the top of the guide rod, an intermediate ring is slidably fitted on the guide rod, a swing rod is rotatably connected to the intermediate ring, the end of the swing rod is rotatably connected to the end block, a hand pressure plate is also slidably fitted on the guide rod, and a drive motor is fixedly connected to the bottom of the hand pressure plate.

[0008] Furthermore, an external thread is provided at the lower portion of the guide rod, an adjusting nut is threadedly connected to the external thread, the adjusting nut is located above the middle ring, and the adjusting nut can squeeze the middle ring so that the middle ring moves vertically downward along the guide rod.

[0009] Furthermore, an upper connecting plate is fixedly connected to the bottom of the connecting shaft, and a lower connecting plate is provided on the top of the sampling rod. The upper connecting plate and the lower connecting plate are fixedly connected together by a plurality of fastening screws and fastening nuts.

[0010] Furthermore, the fastening nut includes a first nut, a second nut, a third nut and a fourth nut, the fastening screw passes through the upper connecting plate and the lower connecting plate, and the fastening screw is threadedly connected with the first nut, the second nut, the third nut and the fourth nut, the first nut and the second nut are respectively located on both sides of the upper connecting plate, and the third nut and the fourth nut are respectively located on both sides of the lower connecting plate.

[0011] Furthermore, a central hole for accommodating the sampling rod to pass through is formed in the middle of the circular bottom plate.

[0012] Furthermore, a support arm is formed on the outer extension of the middle ring, a motor is provided on the support arm, and an output shaft of the motor is connected to a rotating wing.

[0013] Furthermore, the sampling rod comprises an upper connecting rod, a sampling tube and a lower connecting rod, the upper end of the sampling tube is threadedly connected to the upper connecting rod, the lower end of the sampling tube is threadedly connected to the lower connecting rod, and a drill bit is provided at the bottom of the lower connecting rod.

[0014] Furthermore, the sampling mechanism includes a first electric cylinder, which is located in the sampling barrel, and the telescopic rod of the first electric cylinder is connected to a fixed plate, and two clamping blocks are provided on the fixed plate, and an upper sealing cap is clamped and fixed between the two clamping blocks, and a sampling port is formed on the sampling barrel, and a limited clamping groove is formed on the outer wall of the sampling port, and a fixed shaft is provided inside the sampling barrel, and a sealing plate is rotatably connected to the fixed shaft, and the sealing plate can block the sampling port when it is rotated, and the sealing plate is connected to the fixed plate through a traction rope, and a fixed block is provided in the sampling barrel, and the fixed block is located directly below the first electric cylinder, and an installation groove is formed in the middle of the fixed block, and a sampling tube is inserted in the installation groove, and a slot is provided on the top of the fixed block, and a flexible spring is installed in the slot, and the upper end of the flexible spring is fixedly connected to the sealing plate.

[0015] Furthermore, the blocking plate includes a swinging sealing plate and a connecting plate, and a socket for accommodating the installation of a fixed shaft is formed at the junction of the swinging sealing plate and the connecting plate. The swinging sealing plate cooperates with the limiting slot, and the lower end of the flexible spring is fixedly connected to the bottom of the slot, and the upper end of the flexible spring is connected to the connecting plate. One end of the traction rope is connected to the connecting plate, and the other end is connected to the fixed plate.

[0016] Furthermore, the flexible spring can drive the connecting plate to swing towards the direction close to the slot.

[0017] Furthermore, a conical guide surface oblique to the mounting groove is formed on the top of the fixing block.

[0018] Furthermore, the upper sealing cap comprises an outer plate, a rubber plug is provided at the bottom of the outer plate, and the outer plate is clamped between two clamping blocks.

[0019] Furthermore, the liquid mixing mechanism includes a liquid mixing box, a lower groove is formed at the bottom of the fixed block, the liquid mixing box is installed in the lower groove, a partition plate is provided between the lower groove and the installation groove, a piston plate is slidably matched in the liquid mixing box, a second electric cylinder is provided at the bottom of the liquid mixing box, the telescopic rod of the second electric cylinder passes through the bottom of the liquid mixing box and is connected to the piston plate, a liquid outlet pipe is provided at the top of the liquid mixing box, the liquid outlet pipe passes through the partition plate and is inserted into the matching socket at the bottom of the sampling tube, a first filter screen is provided on the top of the matching socket, and the piston plate It is divided into a first connecting cavity and a second connecting cavity, the first connecting cavity is connected with the sampling tube, a positioning hole is formed on the upper side of the sampling tube, a second filter is provided on the side of the positioning hole close to the inner wall of the sampling tube, a guide hole is formed on the inner wall of the mounting groove, a rubber plug is slidably fitted in the guide hole, a compression spring is provided between the bottom of the guide hole and the rubber plug, a through air hole is formed on the rubber plug, the through air hole is connected with an air pipe, the other end of the air pipe is connected to the mixing box, and the air pipe connects the second connecting cavity with the upper side of the sampling tube.

[0020] Furthermore, the fixing block is provided with an installation channel for accommodating the passage of the air pipe.

[0021] Furthermore, the compression spring can drive the rubber pin to be inserted into the positioning hole.

[0022] Furthermore, a positioning groove is provided at the bottom of the sampling tube, and a first filter is provided in the positioning groove.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention integrates the dual functions of sampling and liquid mixing, greatly improving the efficiency and convenience of soil detection. The equipment can easily achieve remote, multi-point soil sampling with the help of drone components, avoiding the tedious and time-consuming traditional manual handling, making the sampling work more efficient and flexible. During the sampling process, through the precise drive of the electric cylinder, the sealing plate and the upper sealing cap can cooperate closely to ensure that the soil sample is not disturbed by the outside world during the sampling process, thereby achieving accurate sampling. At the same time, the built-in liquid mixing mechanism is uniquely designed, which can quickly mix the pure water and soil samples after sampling, providing accurate samples for subsequent salinity and alkalinity detection. This integrated design not only simplifies the operating process, but also greatly improves the accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the sampling mechanism;

[0026] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0027] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;

[0028] Figure 5 A schematic diagram of the structure of the second embodiment of the present invention

[0029] Among them: 1 bracket, 11 circular bottom plate, 12 extension sleeve, 13 extension rod, 14 end block, 141 pin, 15 guide rod, 16 middle ring, 17 adjustment nut, 18 swing rod, 19 top plate,

[0030] 2 hand pressure plate, 3 drive motor, 31 connecting shaft,

[0031] 4 sampling rod, 41 upper connecting rod, 42 lower connecting rod,

[0032] 43 sampling tube, 431 injection port, 432 limit card slot, 433 fixing block, 4331 conical guide surface, 4332 slot, 434 mounting slot, 435 partition plate, 436 lower slot,

[0033] 5 drill bit, 61 upper connecting plate, 62 lower connecting plate, 63 fastening screw, 64 fastening nut,

[0034] 71 first electric cylinder, 711 fixed plate, 712 block, 72 upper sealing cap, 721 outer plate, 722 rubber plug, 73 sealing plate, 731 swing sealing plate, 732 connecting plate, 733 flexible spring, 734 traction rope, 74 sampling tube, 741 second filter screen, 742 positioning hole, 743 positioning groove, 744 first filter screen, 745 matching jack, 751 rubber latch, 752 guide hole, 753 compression spring, 754 air pipe, 76 mixing box, 77 liquid outlet pipe, 78 piston plate, 79 second electric cylinder, S1 first connecting chamber, S2 second connecting chamber, 100 support arm, 101 rotating wing. DETAILED DESCRIPTION

[0035] 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. The present invention is further described in combination with the drawings and embodiments:

[0036] like Figure 1-Figure 4 As shown, a soil salinity sampling and liquid preparation machine includes a bracket 1, a sampling rod 4 is slidably fitted in the bracket, a drill bit 5 is provided at the lower end of the sampling rod, and a driving motor 3 is connected to the top of the sampling rod through a connecting shaft 31. The driving motor can drive the sampling rod to rotate, and a sampling mechanism and a liquid mixing mechanism are provided in the sampling rod.

[0037] In at least one embodiment, the bracket includes a circular base plate 11, and a plurality of extension sleeves 12 are arranged in a circular array on the side wall of the circular base plate. An extension rod 13 is slidably fitted in the extension sleeve, and an end block 14 is provided at the end of the extension rod. A pin 141 is provided at the bottom of the end block. Four guide rods 15 are provided on the top of the circular base plate, and a top plate 19 is provided on the top of the guide rod. An intermediate ring 16 is slidably fitted on the guide rod, and a swing rod 18 is rotatably connected to the intermediate ring. The end of the swing rod is rotatably connected to the end block. A hand pressure plate 2 is also slidably fitted on the guide rod, and a drive motor is fixedly connected to the bottom of the hand pressure plate.

[0038] Furthermore, an external thread is provided at the lower portion of the guide rod, and an adjusting nut 17 is threadedly connected to the external thread. The adjusting nut is located above the middle ring, and the adjusting nut can squeeze the middle ring so that the middle ring moves vertically downward along the guide rod.

[0039] Furthermore, an upper connecting plate 61 is fixedly connected to the bottom of the connecting shaft, and a lower connecting plate 62 is provided on the top of the sampling rod. The upper connecting plate and the lower connecting plate are fixedly connected together by a plurality of fastening screws 63 and fastening nuts 64.

[0040] Furthermore, the fastening nut includes a first nut, a second nut, a third nut and a fourth nut, wherein the fastening screw penetrates the upper connecting plate and the lower connecting plate, and the fastening screw is threadedly connected with the first nut, the second nut, the third nut and the fourth nut, the first nut and the second nut are respectively located on both sides of the upper connecting plate, and the third nut and the fourth nut are respectively located on both sides of the lower connecting plate. This design can adjust the distance between the connecting shaft and the sampling rod, thereby adjusting the sampling depth of the sampling rod.

[0041] Furthermore, a central hole for accommodating the sampling rod to pass through is formed in the middle of the circular bottom plate.

[0042] In certain embodiments, such as Figure 5 As shown, the middle ring is extended to form a support arm 100, and a motor is provided on the support arm. The output shaft of the motor is connected to a rotating wing 101. The four rotating wings can make the whole device fly. This technology is a prior art. By learning from drones, this design can realize multi-point soil sampling of the whole device, which is more convenient than the existing manual handling and movement.

[0043] In at least one embodiment, the sampling rod includes an upper connecting rod 41, a sampling tube 43 and a lower connecting rod 42, the upper end of the sampling tube is threadedly connected to the upper connecting rod, the lower end of the sampling tube is threadedly connected to the lower connecting rod, and a drill bit is provided at the bottom of the lower connecting rod.

[0044] In at least one embodiment, the sampling mechanism includes a first electric cylinder 71, which is located in the sampling barrel. The telescopic rod of the first electric cylinder is connected to a fixed plate 711, and two clamping blocks 712 are provided on the fixed plate. An upper sealing cap 72 is clamped and fixed between the two clamping blocks. A sampling port 431 is formed on the sampling barrel, and a limited position clamping groove 432 is formed on the outer wall of the sampling port. In conjunction with this, a fixed shaft 72 is provided inside the sampling barrel, and a sealing plate 73 is rotatably connected to the fixed shaft. The sealing plate can block the sampling port when it rotates, and the sealing plate is connected to the fixed plate through a traction rope 734. A fixed block 433 is provided in the sampling barrel, and the fixed block is located directly below the first electric cylinder. An installation groove 434 is formed in the middle of the fixed block, and a sampling tube 74 is inserted in the installation groove. A slot 4332 is provided at the top of the fixed block, and a flexible spring 733 is installed in the slot, and the upper end of the flexible spring is fixedly connected to the sealing plate.

[0045] Furthermore, the blocking plate includes a swinging sealing plate 731 and a connecting plate 732, and a socket for accommodating the installation of a fixed shaft is formed at the junction of the swinging sealing plate and the connecting plate. The swinging sealing plate cooperates with the limiting slot, and the lower end of the flexible spring is fixedly connected to the bottom of the slot, and the upper end of the flexible spring is connected to the connecting plate. One end of the traction rope is connected to the connecting plate, and the other end is connected to the fixed plate.

[0046] According to a refinement of the solution, the flexible spring can drive the connecting plate to swing toward a direction close to the slot.

[0047] Furthermore, a conical guide surface 4331 with an oblique mounting groove is formed on the top of the fixing block.

[0048] The solution is refined. The upper sealing cap includes an outer plate 721. A rubber plug 722 is provided at the bottom of the outer plate. The outer plate is clamped between two clamping blocks.

[0049] In at least one embodiment, the liquid mixing mechanism includes a liquid mixing box 76, a lower groove 436 is formed at the bottom of the fixed block, a liquid mixing box is installed in the lower groove, a partition plate 435 is provided between the lower groove and the installation groove, a piston plate 78 is slidably matched in the liquid mixing box, a second electric cylinder 79 is provided at the bottom of the liquid mixing box, a telescopic rod of the second electric cylinder passes through the bottom of the liquid mixing box and is connected to the piston plate, a liquid outlet pipe 77 is provided at the top of the liquid mixing box, the liquid outlet pipe passes through the partition plate and is inserted into the matching socket 745 at the bottom of the sampling tube, a first filter screen 744 is provided at the top of the matching socket, and the piston plate divides the liquid mixing box into a spacer. The first connecting cavity S1 and the second connecting cavity S2 are connected to the sampling tube. A positioning hole 742 is formed on the upper side of the sampling tube. A second filter screen 741 is provided on the side of the positioning hole close to the inner wall of the sampling tube. In cooperation with the positioning hole, a guide hole 752 is formed on the inner wall of the mounting groove. A rubber plug 751 is slidably fitted in the guide hole. A compression spring 753 is provided between the bottom of the guide hole and the rubber plug. A through air hole is formed on the rubber plug. The through air hole is connected to an air pipe 754. The other end of the air pipe is connected to the mixing box. The air pipe connects the second connecting cavity with the upper side of the sampling tube. The first filter screen and the second filter screen can filter the soil without restricting the passage of water.

[0050] Furthermore, the fixing block is provided with an installation channel for accommodating the passage of the air pipe.

[0051] According to a refinement of the solution, the compression spring can drive the rubber latch to be inserted into the positioning hole.

[0052] The solution is refined. A positioning groove 743 is provided at the bottom of the sampling tube, and a first filter is provided in the positioning groove.

[0053] Working method: Use the drone assembly (if equipped) or manually to move the equipment to the soil location to be sampled. If the drone assembly is used, start the motor and rotating wings to make the equipment fly to the target location. Place the equipment stably on the ground and ensure that the sampling rod 4 is aligned with the soil location to be sampled. Press the hand pressure plate 2 downward to move the sampling rod 4 vertically downward, and at the same time drive the motor 3 to rotate, driving the sampling rod 4 and the drill bit 5 to rotate and drill. After the hand pressure plate 2 is pressed to the appropriate depth, keep the sampling rod 4 in a rotating state.

[0054] At this time, the telescopic rod of the first electric cylinder 71 is in an extended state, the upper sealing cap 72 is inserted into the sampling tube 74, the blocking plate 73 blocks the sampling port 431, and the telescopic rod of the first electric cylinder 71 retracts, pulling the fixed plate 711 and the traction rope 734, so that the blocking plate 73 (including the swing sealing plate 731 and the connecting plate 732) swings outward and no longer blocks the sampling port 431. The blocking plate 731 is in a rotating state under the rotation of the sampling rod to cut the perforated side wall soil, and the soil enters the sampling tube 74 along the blocking plate 731 and the conical guide surface 4331. After the sampling is completed, the telescopic rod of the first electric cylinder 71 is extended, so that the upper sealing cap 72 (including the outer plate 721 and the rubber plug 722) is inserted into the sampling tube 74, and at the same time, the blocking plate 73 returns to its original position under the action of the flexible spring 733 to block the sampling port 431.

[0055] Before sampling, pure water has been stored in the first connecting chamber S1 of the mixing liquid box 76. The second electric cylinder 79 is actuated to push the piston plate 78, so that the pure water enters the sampling tube 74 along the liquid outlet pipe 77. The gas in the sampling tube 74 is squeezed and enters the second connecting chamber S2 of the mixing liquid box 76 along the positioning hole 742 and the air pipe 754. The second electric cylinder 79 continuously extends and retracts, so that the pure water and the soil are fully mixed in the sampling tube 74 to complete the liquid preparation process. After the last mixing, the second electric cylinder 79 retracts the piston plate 78 to the bottom of the mixing liquid box 76, and the mixed liquid is stored in the first connecting chamber S1. Unscrew the sampling cylinder 43, remove the mixing liquid box 76, and use the mixed liquid to detect soil salinity. Replace the new sampling cylinder 43 between the upper connecting rod 41 and the lower connecting rod 42 of the sampling rod 4 to prepare for the next sampling.

[0056] If multiple sampling points are required, repeat the above steps and use the drone assembly or manual transport equipment to the next sampling point.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A soil salinity sampling and liquid preparation machine, characterized in that: The invention comprises a bracket, in which a sampling rod is slidably fitted, a drill bit is provided at the lower end of the sampling rod, a driving motor is connected to the top of the sampling rod through a connecting shaft, the driving motor can drive the sampling rod to rotate, a sampling mechanism and a liquid mixing mechanism are provided in the sampling rod, the bracket comprises a circular bottom plate, a plurality of extension sleeves are arranged in a ring array on the side wall of the circular bottom plate, an extension rod is slidably fitted in the extension sleeve, an end block is provided at the end of the extension rod, a pin is provided at the bottom of the end block, four guide rods are provided at the top of the circular bottom plate, a top plate is provided at the top of the guide rod, an intermediate ring is slidably fitted on the guide rod, a swing rod is rotatably connected to the intermediate ring, the end of the swing rod is rotatably connected to the end block, a hand pressure plate is also slidably fitted on the guide rod, and the bottom of the hand pressure plate is fixedly connected to the driving motor.

2. The soil salinity sampling and liquid preparation integrated machine according to claim 1, characterized in that: The lower part of the guide rod is provided with an external thread, and an adjusting nut is threadedly connected to the external thread. The adjusting nut is located above the middle ring, and the adjusting nut can squeeze the middle ring so that the middle ring moves vertically downward along the guide rod.

3. The soil salinity sampling and liquid preparation integrated machine according to claim 1 or 2, characterized in that: A central hole for accommodating the sampling rod to pass through is formed in the middle of the circular bottom plate.

4. The soil salinity sampling and liquid preparation integrated machine according to claim 1, characterized in that: A support arm is formed on the outer extension of the middle ring, a motor is arranged on the support arm, and a rotating wing is connected to the output shaft of the motor.

5. The soil salinity sampling and liquid preparation integrated machine according to claim 1 or 2, characterized in that: The sampling rod comprises an upper connecting rod, a sampling tube and a lower connecting rod. The upper end of the sampling tube is threadedly connected to the upper connecting rod, the lower end of the sampling tube is threadedly connected to the lower connecting rod, and a drill bit is arranged at the bottom of the lower connecting rod.

6. The soil salinity sampling and liquid preparation integrated machine according to claim 5, characterized in that: The sampling mechanism includes a first electric cylinder, which is located in the sampling barrel, and a telescopic rod of the first electric cylinder is connected to a fixed plate, and two blocks are provided on the fixed plate, and an upper sealing cap is clamped and fixed between the two blocks. A sampling port is formed on the sampling barrel, and a limited position slot is formed on the outer wall of the sampling port. A fixed shaft is provided inside the sampling barrel, and a sealing plate is rotatably connected to the fixed shaft, and the sealing plate can block the sampling port when it rotates, and the sealing plate is connected to the fixed plate through a traction rope. A fixed block is provided in the sampling barrel, and the fixed block is located directly below the first electric cylinder. An installation groove is formed in the middle of the fixed block, and a sampling tube is inserted in the installation groove. A slot is provided on the top of the fixed block, and a flexible spring is installed in the slot, and the upper end of the flexible spring is fixedly connected to the sealing plate.

7. The soil salinity sampling and liquid preparation integrated machine according to claim 6, characterized in that: The blocking plate includes a swinging sealing plate and a connecting plate. A socket for accommodating the installation of a fixed shaft is formed at the junction of the swinging sealing plate and the connecting plate. The swinging sealing plate cooperates with the limiting slot. The lower end of the flexible spring is fixedly connected to the bottom of the slot, and the upper end of the flexible spring is connected to the connecting plate. One end of the traction rope is connected to the connecting plate, and the other end is connected to the fixed plate.

8. The soil salinity sampling and liquid preparation integrated machine according to claim 7, characterized in that: A conical guide surface oblique to the mounting groove is formed on the top of the fixing block.

9. The soil salinity sampling and liquid preparation integrated machine according to claim 7, characterized in that: The liquid mixing mechanism includes a liquid mixing box, a lower groove is formed at the bottom of the fixed block, the liquid mixing box is installed in the lower groove, a partition plate is provided between the lower groove and the installation groove, a piston plate is slidably matched in the liquid mixing box, a second electric cylinder is provided at the bottom of the liquid mixing box, the telescopic rod of the second electric cylinder passes through the bottom of the liquid mixing box and is connected to the piston plate, a liquid outlet pipe is provided at the top of the liquid mixing box, the liquid outlet pipe passes through the partition plate and is inserted into the matching socket at the bottom of the sampling tube, a first filter is provided on the top of the matching socket, and the piston plate divides the liquid mixing box into a spacer. It is a first connecting cavity and a second connecting cavity, the first connecting cavity is connected with the sampling tube, a positioning hole is formed on the upper side of the sampling tube, a second filter is provided on the side of the positioning hole close to the inner wall of the sampling tube, a guide hole is formed on the inner wall of the mounting groove, a rubber plug is slidably fitted in the guide hole, a compression spring is provided between the bottom of the guide hole and the rubber plug, a through air hole is formed on the rubber plug, the through air hole is connected with an air pipe, the other end of the air pipe is connected to the mixing box, and the air pipe connects the second connecting cavity with the upper side of the sampling tube.

10. The soil salinity sampling and liquid preparation integrated machine according to claim 9, characterized in that: A positioning groove is provided at the bottom of the sampling tube, and a first filter screen is provided in the positioning groove.

Images