Mangrove forest soil bulk density sampling device

Abstract

The invention relates to the field of sampling devices, and discloses a mangrove forest soil bulk density sampling device which comprises a sampling shell, the bottom end of the sampling shell is rotatably connected with two first limiting frames and two second limiting frames, the bottom ends of the two first limiting frames are fixedly connected with first pull ropes, and the top end of the sampling shell is fixedly connected with two fixing cylinders. A pull rod is slidably connected to the middle of the fixed cylinder, two first pull ropes are fixedly connected with the pull rod on one side, second pull ropes are fixedly connected to the top ends of the two second limiting frames, and the two second pull ropes are fixedly connected with the pull rod on the other side; the two first limiting frames are symmetrically arranged with the longitudinal central axis of one side of the sampling shell as the center. Compared with the prior art, the soil sampling device has the advantages that the situation that a complete soil sample cannot be sampled due to falling of sampled soil is avoided, and the situation that the soil is excessively extruded in the soil sampling process is reduced.

Description

Technical Field

[0001] The invention relates to the field of sampling devices, in particular to a mangrove soil bulk density sampling device. Background Art

[0002] Mangroves are an important part of the coastal "blue carbon" ecosystem. Their area accounts for only 0.1% of the world's total land area, but their carbon sequestration accounts for 5% of the world's total carbon sequestration. They can effectively reduce the concentration of atmospheric carbon dioxide and slow down global climate change. Among the carbon sequestration of mangrove ecosystems, 81.74% is distributed in the soil. In order to scientifically and accurately evaluate the soil carbon sequestration of mangroves, it is necessary to understand the soil bulk density of mangroves.

[0003] Currently, soil bulk density is mostly sampled using a ring knife, but the ring knife has a large sampling volume and cannot be applied to thin soil layers. In addition, in mangrove mudflats with high water content and soft soil, the ring knife is prone to failure to completely collect soil samples and sample extrusion and deformation, which affect the bulk density results. Therefore, we disclose a mangrove soil bulk density sampling device to meet the needs of completely collecting mangrove mudflat soil samples and keeping the samples in their original state. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides a mangrove soil bulk density sampling device, which has the advantages of completely collecting mangrove tidal flat soil samples and maintaining the sample prototype, and solves a series of problems such as the large sampling volume of the ring knife and the inability to be applied to thinner soil layers.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a mangrove soil bulk density sampling device, comprising a sampling shell, the bottom end of the sampling shell is rotatably connected to two first limit frames and two second limit frames, the bottom ends of the two first limit frames are fixedly connected to a first pull rope, the top of the sampling shell is fixedly connected to two fixed cylinders, the middle part of the fixed cylinder is slidably connected to a pull rod, the two first pull ropes are fixedly connected to the pull rod on one side, the tops of the two second limit frames are fixedly connected to the second pull ropes, and the two second pull ropes are fixedly connected to the pull rod on the other side. The sampling shell is a rectangular sleeve shell, the two first limit frames are symmetrically centered on the longitudinal central axis of one side of the sampling shell, and the two second limit frames are symmetrically distributed around the longitudinal central axis of the other side of the sampling shell, the top of the first limit frame is in contact with the bottom end of the sampling shell, and the top of the second limit frame is in contact with the bottom end of the first limit frame.

[0008] Preferably, two first limiting grooves are provided in the middle of the pull rod, a spring is fixedly connected to the outer wall of the fixed cylinder, one end of the spring is fixedly connected to a limiting rod, and the limiting rod passes through the inner cavity of the fixed cylinder and is movably engaged with the first limiting groove.

[0009] Preferably, one end of the two limit rods extending outside the fixed tube is fixedly connected to a connecting rod, the two limit rods and the connecting rod form a U-shape, and one end of the pull rod extending outside the fixed tube is fixedly connected to a pull plate.

[0010] Preferably, the limiting rod and the pulling rod are both T-shaped rods, and a T-shaped groove is provided in the fixing tube.

[0011] Preferably, a handle is fixedly connected to the top of the sampling shell, the inner and outer walls of the sampling shell are fixedly connected to a protective sleeve, the first pull rope and the second pull rope are slidably connected in the protective sleeve, and a plurality of limit blocks are fixedly connected to the bottom end of the sampling shell, and the limit blocks are fitted with the first limit frame and the second limit frame.

[0012] Preferably, the first pull rope is fixedly connected to the pull rod after passing through the fixing tube on one side, and the second pull rope is fixedly connected to the pull rod after passing through the sampling shell.

[0013] Preferably, the first limiting frame and the second limiting frame are both composed of a plurality of inserting rods and connecting plates, and the two first limiting frames and the two second limiting frames can cover the bottom end of the sampling shell after being combined, and a feed trough is provided at the bottom end of the sampling shell.

[0014] Preferably, a placement groove is provided on one side of the sampling shell, and a sampling box is slidably connected to the inner cavity of the placement groove. A soil groove is provided at the bottom end of the sampling box. A plurality of sockets are provided on the other side of the sampling shell. Two connecting sleeves are fixedly connected to the top of the sampling box. A pin is slidably connected to the inner cavity of the socket. The pin passes through the inner cavity of the sampling shell and is movably connected to the connecting sleeve.

[0015] Preferably, the latch is U-shaped, and second limiting grooves are provided on both sides of the inner wall of the insertion hole. A limiting block is movably engaged in the second limiting groove, and the limiting block is fixedly connected to the latch.

[0016] Preferably, an anti-slip sleeve is fixedly connected to the inner wall of the connecting sleeve.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a mangrove soil bulk density sampling device, which has the following beneficial effects:

[0019] 1. The mangrove soil bulk density sampling device drives the first pull rope to move when the pull rod on one side is pulled, so that the first pull rope pulls the first limit frame to flip in the direction away from the bottom end of the sampling shell, so that the two first limit frames are opened, so that the soil can enter the sampling shell from the bottom end of the sampling shell, and when the sampling shell is inserted into the soil, it will drive the first limit frame to be inserted into the soil first, so that the first limit frame will divide the soil in the sampling area, which is beneficial to the subsequent soil collection. When the pull rod on the other side is pulled upward, it will drive the second limit frame to move closer to the sampling shell through the second pull rope, so that the second limit frame will block the bottom end of the sampling shell, thereby preventing the soil from falling after sampling, resulting in the inability to take a complete soil sample.

[0020] 2. In the mangrove soil bulk density sampling device, the fixed cylinder limits the position of the limit rod through the spring, so that the limit rod limits the position of the pull rod after moving through the first limit groove, maintains the position of the first limit frame and the second limit frame after moving, ensures the normal use of the device, and is convenient for the staff to operate. The two limit rods can be moved at the same time through the connecting rod, which is convenient for operation.

[0021] 3. In the mangrove soil bulk density sampling device, the sampling box enters the sampling shell through the placement slot, so that the soil can enter the sampling box, and thus the collected soil enters the sampling box, so that the sampling box can control the amount of soil collected, reduce the situation where the soil is excessively squeezed due to excessive soil collection, and the collected soil can be stored together with the sampling box to avoid the situation where the soil with too high water content suffers a large loss during the movement. The pin limits the position of the sampling box through the connecting sleeve, so that the position of the sampling box is stable when collecting soil, so that the sampling box can smoothly collect soil, and the staff can replace the sampling box of suitable capacity as needed, which is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the connection between the sampling shell and the sampling box of the present invention;

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the connection between the first limiting frame and the second limiting frame of the present invention;

[0025] Figure 4 It is a schematic diagram of a partially cutaway three-dimensional structure of the sampling shell of the present invention;

[0026] Figure 5 For the present invention Figure 4 A is an enlarged schematic diagram of the three-dimensional structure;

[0027] Figure 6It is a schematic diagram of a partially cutaway three-dimensional structure of the fixing tube of the present invention.

[0028] In the figure: 1. sampling shell; 2. first limiting frame; 3. second limiting frame; 4. first pull rope; 5. fixing tube; 6. pull rod; 7. first limiting groove; 8. limiting rod; 9. spring; 10. connecting rod; 11. pull plate; 12. second pull rope; 13. placement groove; 14. sampling box; 15. jack; 16. latch; 17. connecting sleeve; 18. second limiting groove; 19. limiting block. DETAILED DESCRIPTION

[0029] 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.

[0030] As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, this application proposes a mangrove soil bulk density sampling device.

[0031] In a typical implementation of the present application, Figure 1-Figure 6As shown, a mangrove soil bulk density sampling device comprises a sampling shell 1, the bottom end of the sampling shell 1 is rotatably connected to two first limit frames 2 and two second limit frames 3, the bottom ends of the two first limit frames 2 are fixedly connected to a first pull rope 4, the top end of the sampling shell 1 is fixedly connected to two fixed cylinders 5, the middle part of the fixed cylinder 5 is slidably connected to a pull rod 6, the two first pull ropes 4 are fixedly connected to the pull rod 6 on one side, the top ends of the two second limit frames 3 are fixedly connected to the second pull rope 12, and the two second pull ropes 12 are fixedly connected to the pull rod 6 on the other side, the sampling shell 1 is a rectangular sleeve shell, the two first limit frames 2 are symmetrically arranged with the longitudinal central axis of one side of the sampling shell 1 as the center, and the two second limit frames 3 are symmetrically distributed with the longitudinal central axis of the other side of the sampling shell 1 as the center. The top of the first limiting frame 2 is fitted with the bottom end of the sampling shell 1, and the top of the second limiting frame 3 is fitted with the bottom end of the first limiting frame 2. The first limiting frame 2 and the second limiting frame 3 are both composed of a plurality of plug rods and a connecting plate. The two first limiting frames 2 and the two second limiting frames 3 can cover the bottom end of the sampling shell 1 after being combined. A feeding trough is provided at the bottom end of the sampling shell 1. When in use, the two first limiting frames 2 and the two second limiting frames 3 are rotatably connected through the bottom end of the sampling shell 1, so that the sampling shell 1 limits the rotation position of the first limiting frame 2 and the second limiting frame 3. The bottom ends of the two first limiting frames 2 are fixedly connected with a first pull rope 4, so that the first pull rope 4 can drive the first limiting frame 2 to rotate, and the top of the sampling shell 1 is fixedly connected with two fixing cylinders 5. The middle part of the fixed tube 5 is slidably connected with a pull rod 6, and the two first pull ropes 4 are fixedly connected to the pull rod 6 on one side, so that when the pull rod 6 on one side is pulled, the first pull rope 4 will be driven to move, so that the first pull rope 4 will pull the first limiting frame 2 to flip in the direction away from the bottom end of the sampling shell 1, so that the two first limiting frames 2 are opened, so that the soil can enter the sampling shell 1 from the bottom end of the sampling shell 1, and when the sampling shell 1 is inserted into the soil, it will drive the first limiting frame 2 to be inserted into the soil first, so that the first limiting frame 2 will divide the soil in the sampling area, which is beneficial to the subsequent soil collection. The top ends of the two second limiting frames 3 are fixedly connected with second pull ropes 12, and the two second pull ropes 12 are fixedly connected to the pull rod 6 on the other side, so that when the pull rod 6 on the other side is pulled upward, The second limit frame 3 is driven by the second pull rope 12 to move closer to the sampling shell 1, so that the second limit frame 3 will block the bottom end of the sampling shell 1 to prevent the soil from falling after sampling, resulting in the inability to take a complete soil sample. The sampling shell 1 is a rectangular shell, and the two first limit frames 2 are symmetrically distributed with the longitudinal center axis of one side of the sampling shell 1 as the center, and the two second limit frames 3 are symmetrically distributed with the longitudinal center axis of the other side of the sampling shell 1 as the center. The top of the first limit frame 2 is in contact with the bottom end of the sampling shell 1, and the top of the second limit frame 3 is in contact with the bottom end of the first limit frame 2, so that when the first limit frame 2 is opened, it will push the second limit frame 3 to open together, so that the bottom end of the sampling shell 1 is fully opened, so that the sampling shell 1 can smoothly collect soil.When the second limiting frame 3 moves closer to the sampling shell 1, it will push the first limiting frame 2 to move closer to the sampling shell 1, blocking the bottom end of the sampling shell 1 to prevent the soil from falling after collection and protect the integrity of the sampled soil. The first limiting frame 2 and the second limiting frame 3 are both composed of a plurality of plug rods and a connecting plate, so that when the first limiting frame 2 and the second limiting frame 3 are closed, the excess soil will be squeezed out from the gaps between the plurality of plug rods, reducing the situation of excessive squeezing of the soil sample and reducing the impact on the soil sample. After the two first limiting frames 2 and the two second limiting frames 3 are combined, they can cover the bottom end of the sampling shell 1, so that the first limiting frame 2 and the second limiting frame 3 can cooperate to achieve a better limiting effect on the collected soil.

[0032] As a preferred implementation in this embodiment, refer to the attached Figure 1 , Figure 2 and Figure 6Two first limiting grooves 7 are provided in the middle of the pull rod 6, and a spring 9 is fixedly connected to the outer wall of the fixed cylinder 5. One end of the spring 9 is fixedly connected to the limiting rod 8, and the limiting rod 8 penetrates the inner cavity of the fixed cylinder 5 and is movably connected to the first limiting groove 7. One end of the two limiting rods 8 extending to the outside of the fixed cylinder 5 is fixedly connected to the connecting rod 10. The two limiting rods 8 and the connecting rod 10 form a U-shape, and one end of the pull rod 6 extending to the outside of the fixed cylinder 5 is fixedly connected to the pull plate 11. The spring 9 and the pull rod 6 are both T-shaped rods, and a T-shaped groove is provided in the fixed cylinder 5. The top of the sampling shell 1 is fixedly connected to a handle, and the inner and outer walls of the sampling shell 1 are fixedly connected to protective sleeves. The first pull rope 4 and the second pull rope 12 are both slidably connected in the protective sleeve, and a plurality of limit blocks are fixedly connected to the bottom end of the sampling shell 1, and the limit blocks are fitted with the first limit frame 2 and the second limit frame 3. The first pull rope 4 passes through a fixed cylinder 5 on one side and is fixedly connected to the pull rod 6. The second pull rope 12 passes through the sampling shell 1 and is fixedly connected to the pull rod 6. Two first limit grooves 7 are opened through the middle of the pull rod 6. The outer wall of the fixed cylinder 5 is fixedly connected with a spring 9, and one end of the spring 9 is fixedly connected to a limit rod 8. The limit rod 8 passes through the inner cavity of the fixed cylinder 5 and is movably engaged with the first limit groove 7, so that the fixed cylinder 5 limits the position of the limit rod 8 through the spring 9, so that The limiting rod 8 limits the position of the pull rod 6 after it moves through the first limiting groove 7, maintains the position of the first limiting frame 2 and the second limiting frame 3 after they move, ensures the normal use of the device, and is convenient for the staff to operate. The two limiting rods 8 extend to one end of the outside of the fixed cylinder 5 and are fixedly connected with a connecting rod 10. The two limiting rods 8 and the connecting rod 10 form a U-shape, so that the staff can simultaneously drive the two limiting rods 8 to move through the connecting rod 10, which is convenient for operation. The pull rod 6 extends to one end of the outside of the fixed cylinder 5 and is fixedly connected with a pull plate 11, so that the pull rod 6 is easy to operate. The limiting rod 8 and the pull rod 6 are both T-shaped rods, and the fixed cylinder 5 is opened A T-shaped groove is provided, so that the limit rod 8 can easily limit the position of the spring 9, and the fixed tube 5 can limit the moving range of the pull rod 6. A handle is fixedly connected to the top of the sampling shell 1, so that the sampling shell 1 is easy to use. A protective sleeve is fixedly connected to the inner and outer walls of the sampling shell 1. The first pull rope 4 and the second pull rope 12 are both slidably connected in the protective sleeve, so that the moving position of the first pull rope 4 and the second pull rope 12 is limited, which is convenient for operation. A plurality of limit blocks are fixedly connected to the bottom end of the sampling shell 1, and the limit blocks are fitted with the first limit frame 2 and the second limit frame 3, so that the position of the first limit frame 2 and the second limit frame 3 after opening is limited.

[0033] As a preferred implementation in this embodiment, refer to the attached Figure 2-Figure 5A placement groove 13 is provided on one side of the sampling shell 1, and a sampling box 14 is slidably connected to the inner cavity of the placement groove 13. A soil groove is provided at the bottom of the sampling box 14. A plurality of plug holes 15 are provided on the other side of the sampling shell 1. Two connecting sleeves 17 are fixedly connected to the top of the sampling box 14. A latch 16 is slidably connected to the inner cavity of the plug hole 15. The latch 16 penetrates the inner cavity of the sampling shell 1 and is movably connected to the connecting sleeve 17. The latch 16 is U-shaped. Second limiting grooves 18 are provided on both sides of the inner wall of the plug hole 15. A limiting block 19 is movably connected in the second limiting groove 18. The limiting block 19 is fixedly connected to the latch 16. The inner wall of the connecting sleeve 17 is fixedly connected with an anti-slip sleeve, and a placement groove 13 is opened on one side of the sampling shell 1, and the inner cavity of the placement groove 13 is slidably connected with a sampling box 14, and a soil groove is opened at the bottom of the sampling box 14, so that the sampling box 14 can enter the sampling shell 1 through the placement groove 13, so that the soil can enter the sampling box 14, so that the collected soil enters the sampling box 14, so that the sampling box 14 can control the amount of soil collected, reduce the situation of excessive squeezing of the soil caused by excessive soil collection, and the collected soil can be stored together with the sampling box 14 to avoid excessive water content. In the case where the soil is greatly lost during the movement, a plurality of jacks 15 are provided on the other side of the sampling shell 1. The top of the sampling box 14 is fixedly connected to two connecting sleeves 17. The inner cavity of the jack 15 is slidably connected to a latch 16. The latch 16 passes through the inner cavity of the sampling shell 1 and is movably connected to the connecting sleeve 17, so that the latch 16 can limit the position of the sampling box 14 through the connecting sleeve 17, so that the position of the sampling box 14 is stable when collecting soil, so that the sampling box 14 can collect soil smoothly, and the staff can replace the sampling box 14 of suitable capacity as needed, which is more practical. 6 is U-shaped, so that the pin 16 has a good limiting effect on the sampling box 14 and is easy to use. Second limiting grooves 18 are opened on both sides of the inner wall of the socket 15, and a limiting block 19 is movably engaged in the second limiting groove 18. The limiting block 19 is fixedly connected to the pin 16, so that the socket 15 limits the position of the pin 16 through the second limiting groove 18 and the limiting block 19, thereby reducing the possibility of the pin 16 slipping off by the user. An anti-slip sleeve is fixedly connected to the inner wall of the connecting sleeve 17, so that the position of the connecting sleeve 17 and the pin 16 after being sleeved is relatively stable, which is convenient for stabilizing the position of the sampling box 14.

[0034] The working principle of the present invention is as follows: when in use, the pull rod 6 on one side is pulled to drive the first pull rope 4 to move, so that the first pull rope 4 pulls the first limit frame 2 to flip in the direction away from the bottom end of the sampling shell 1, so that the two first limit frames 2 are opened, so that the soil can enter the sampling shell 1 from the bottom end of the sampling shell 1, and when the sampling shell 1 is inserted into the soil, it will drive the first limit frame 2 to be inserted into the soil first, so that the first limit frame 2 divides the soil in the sampling area, which is beneficial to the subsequent soil collection. When the pull rod 6 on the other side is pulled upward, it will drive the second limit frame 2 through the second pull rope 12 The rack 3 moves closer to the sampling shell 1, so that the second limiting rack 3 will block the bottom end of the sampling shell 1 to prevent the soil from falling after sampling, resulting in the inability to take a complete soil sample. When the first limiting rack 2 is opened, the second limiting rack 3 will be pushed to open together, so that the bottom end of the sampling shell 1 is completely opened, so that the sampling shell 1 can smoothly collect soil. When the second limiting rack 3 moves closer to the sampling shell 1, the first limiting rack 2 will be pushed to move closer to the sampling shell 1, blocking the bottom end of the sampling shell 1 to prevent the soil from falling after collection and protect the integrity of the sampled soil.

[0035] The fixed cylinder 5 limits the position of the limit rod 8 through the spring 9, so that the limit rod 8 limits the position of the pull rod 6 after moving through the first limit groove 7, maintains the position of the first limit frame 2 and the second limit frame 3 after moving, ensures the normal use of the device, and facilitates the operation of the staff. The two limit rods 8 can be moved at the same time through the connecting rod 10, which is convenient for operation.

[0036] The sampling box 14 enters the sampling shell 1 through the placement slot 13, so that the soil can enter the sampling box 14, and the collected soil enters the sampling box 14, so that the sampling box 14 can control the amount of soil collected, reduce the situation where the soil is excessively squeezed due to excessive soil collection, and the collected soil can be stored together with the sampling box 14 to avoid the situation where the soil with too high water content suffers a large loss during the movement. The pin 16 limits the position of the sampling box 14 through the connecting sleeve 17, so that the position of the sampling box 14 is stable when collecting soil, so that the sampling box 14 can smoothly collect soil, and the staff can replace the sampling box 14 of appropriate capacity as needed, which is more practical.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mangrove soil bulk density sampling device, characterized in that: The sampling shell (1) comprises two first limit frames (2) and two second limit frames (3) which are rotatably connected at the bottom end of the sampling shell (1), the bottom ends of the two first limit frames (2) are fixedly connected with a first pull rope (4), the top end of the sampling shell (1) is fixedly connected with two fixed cylinders (5), the middle part of the fixed cylinder (5) is slidably connected with a pull rod (6), the two first pull ropes (4) are fixedly connected to one side of the pull rod (6), the top ends of the two second limit frames (3) are fixedly connected with a second pull rope (12 ), the two second pull ropes (12) are fixedly connected to the pull rod (6) on the other side, the sampling shell (1) is a rectangular sleeve shell, the two first limit frames (2) are symmetrically arranged with the longitudinal center axis of one side of the sampling shell (1) as the center, and the two second limit frames (3) are symmetrically arranged with the longitudinal center axis of the other side of the sampling shell (1) as the center, the top end of the first limit frame (2) is in contact with the bottom end of the sampling shell (1), and the top end of the second limit frame (3) is in contact with the bottom end of the first limit frame (2).

2. A mangrove soil bulk density sampling device according to claim 1, characterized in that: Two first limiting grooves (7) are provided in the middle of the pull rod (6); a spring (9) is fixedly connected to the outer wall of the fixed cylinder (5); one end of the spring (9) is fixedly connected to a limiting rod (8); the limiting rod (8) passes through the inner cavity of the fixed cylinder (5) and is movably engaged with the first limiting groove (7).

3. A mangrove soil bulk density sampling device according to claim 2, characterized in that: One end of the two limit rods (8) extending to the outside of the fixed tube (5) is fixedly connected to a connecting rod (10), the two limit rods (8) and the connecting rod (10) form a U-shape, and one end of the pull rod (6) extending to the outside of the fixed tube (5) is fixedly connected to a pull plate (11).

4. A mangrove soil bulk density sampling device according to claim 2, characterized in that: The limiting rod (8) and the pulling rod (6) are both T-shaped rods, and a T-shaped groove is provided in the fixing tube (5).

5. A mangrove soil bulk density sampling device according to claim 1, characterized in that: The top of the sampling shell (1) is fixedly connected to a handle, the inner and outer walls of the sampling shell (1) are fixedly connected to protective sleeves, the first pull rope (4) and the second pull rope (12) are slidably connected in the protective sleeves, and the bottom of the sampling shell (1) is fixedly connected to a plurality of limit blocks, and the limit blocks are fitted with the first limit frame (2) and the second limit frame (3).

6. A mangrove soil bulk density sampling device according to claim 1, characterized in that: The first pull rope (4) passes through the fixed cylinder (5) on one side and is fixedly connected to the pull rod (6), and the second pull rope (12) passes through the sampling shell (1) and is fixedly connected to the pull rod (6).

7. A mangrove soil bulk density sampling device according to claim 1, characterized in that: The first limiting frame (2) and the second limiting frame (3) are both composed of a plurality of plug rods and a connecting plate. The two first limiting frames (2) and the two second limiting frames (3) can cover the bottom end of the sampling shell (1) when combined. The bottom end of the sampling shell (1) is provided with a feed trough.

8. The mangrove soil bulk density sampling device according to claim 1, characterized in that: A placement groove (13) is provided on one side of the sampling shell (1), and a sampling box (14) is slidably connected to the inner cavity of the placement groove (13), and a soil groove is provided at the bottom end of the sampling box (14). A plurality of insertion holes (15) are provided on the other side of the sampling shell (1), and two connecting sleeves (17) are fixedly connected to the top of the sampling box (14). A plug (16) is slidably connected to the inner cavity of the insertion hole (15), and the plug (16) passes through the inner cavity of the sampling shell (1) and is movably connected to the connecting sleeve (17).

9. A mangrove soil bulk density sampling device according to claim 8, characterized in that: The latch (16) is U-shaped, and second limiting grooves (18) are provided on both sides of the inner wall of the insertion hole (15). A limiting block (19) is movably engaged in the second limiting groove (18), and the limiting block (19) is fixedly connected to the latch (16).

10. A mangrove soil bulk density sampling device according to claim 9, characterized in that: The inner wall of the connecting sleeve (17) is fixedly connected with an anti-slip sleeve.

Images