A forest resource surveying and mapping sampler

Abstract

This utility model belongs to the technical field of soil sampling devices, and particularly relates to a forest and grassland resource mapping sampler. Addressing the problems of cumbersome operation and secondary disturbance during soil sample extraction in existing sampling devices, the following solution is proposed: It includes an outer cylinder and an inner cylinder that are rotatably fitted together. A spiral blade is fixedly connected to the outer wall of the outer cylinder, and a ring-shaped soil-cutting blade is fixedly connected to the bottom of the inner cylinder. An outer cylinder connecting sleeve is connected to the top of the outer cylinder, and an inner cylinder connecting sleeve is connected to the top of the inner cylinder. A hydraulic locking assembly is provided between the two, comprising two symmetrically arranged movable clamping blocks. In the non-locked state, gaps are left between the movable clamping blocks and the inner cylinder connecting sleeve and the threaded rod. When the hydraulic locking assembly drives the movable clamping blocks to move radially inward, the lower block body is tightly pressed against the outer wall of the inner cylinder connecting sleeve, and the upper block body forms a threaded engagement connection with the threaded rod. This sampler has a compact structure, is easy to operate, and can effectively protect the original structure of the soil sample.

Description

Technical Field

[0001] This utility model relates to a sampler, specifically a forest and grassland resource mapping sampler, belonging to the technical field of soil sampling devices. Background Technology

[0002] Forest and grassland resource mapping is a fundamental task for forestry and grassland resource surveys, ecological monitoring, and carbon sink measurement and assessment. In the field mapping and ecological survey of forest and grassland resources, it is usually necessary to simultaneously complete the stratified collection of soil samples for analysis of soil physicochemical properties and carbon content, as well as the sampling of aboveground vegetation parts for estimation of biomass.

[0003] In the prior art, such as the announcement number CN109187073B, a spiral static pressure undisturbed soil sampler is disclosed, which consists of a spiral cutting cylinder, a sampling cylinder, and a fixed connecting bearing. The spiral cutting cylinder includes a rotating handle, a spiral cutting ring cutter, a vertical ring cutter, and a cylinder body. The rotating handle is fixed to the top of the cylinder body. The spiral cutting ring cutter is spirally distributed on the outer wall of the cylinder body, and the vertical ring cutter is located at the bottom of the cylinder body. The fixed connecting bearing consists of a ball bearing and a control bracket. The outer ring of the ball bearing is connected to the inner wall of the spiral cutting cylinder, and the inner ring of the ball bearing is connected to the outer wall of the sampling cylinder, so that the spiral cutting cylinder and the sampling cylinder can rotate relative to each other. This soil sampler can ensure that the soil sample is undisturbed or minimally disturbed, and the soil sampling process is relatively simple and labor-saving. However, after sampling, the soil sample needs to be removed from the sampling tube. Existing technologies typically remove the sample by striking the tube wall or by using a push rod to eject the soil column from the top. This method easily causes secondary disturbance to the soil sample, and the force during ejection is difficult to control, potentially leading to loose soil columns or misaligned layers. Furthermore, CN207964331U discloses a direct-pressure spiral undisturbed soil sampler. Its inner tube is placed inside the sampling tube as a container for undisturbed soil, coaxial with the sampling tube. The outer wall of the inner tube is in smooth contact with the inner wall of the sampling tube. A lever is inserted into a cross-shaped tube to rotate the sampling tube, causing it to penetrate deeper into the soil. Undisturbed soil is obtained through spiral blades on the sampling tube, and the stationary cylindrical undisturbed soil enters the inner tube, which does not rotate with the sampling tube. Although the device achieves undisturbed soil sampling with the outer cylinder rotating while the inner cylinder remains stationary, its inner cylinder is merely a simple container. After sampling, the inner cylinder is pulled out to remove the soil. However, in sampling scenarios with larger diameters or greater depths, the soil column is prone to deformation or loosening after the inner cylinder is pulled out. Furthermore, the process of removing the inner cylinder itself is an additional operation step, failing to achieve an integrated sampling and removal process, thus increasing the additional operation steps in field operations. Moreover, the relative displacement between the inner and outer cylinders during the soil sample extraction process can easily lead to soil sample damage. Utility Model Content

[0004] This invention provides a forest and grassland resource surveying and sampling device to solve the problems of cumbersome operation and easy secondary disturbance during soil sample extraction of existing sampling devices.

[0005] The present invention achieves the above objectives through the following technical solution: a forest and grassland resource mapping and sampling device, comprising an outer cylinder and an inner cylinder that are rotatably connected to each other, a spiral blade fixedly connected to the outer wall of the outer cylinder, and an annular soil cutting blade fixedly connected to the bottom end of the inner cylinder. The top end of the outer cylinder is fixedly connected to an outer cylinder docking sleeve, the top end of the inner cylinder is fixedly connected to an inner cylinder docking sleeve, and a hydraulic locking assembly is provided between the outer cylinder docking sleeve and the inner cylinder docking sleeve. The hydraulic locking assembly includes two symmetrically arranged movable clamping blocks, each movable clamping block being radially movable and installed inside the outer cylinder docking sleeve. The movable clamping block has an upper block body and a lower block body. The inner cylinder has a push plate and a threaded rod fixedly connected to the push plate surface; In the unlocked state, there are gaps between the inner side of the movable clamping block and the outer wall of the inner cylinder connecting sleeve, as well as between the inner side of the movable clamping block and the rod body of the threaded rod. When the hydraulic locking assembly drives the movable clamping block to move radially inward, the inner side of the lower part of the movable clamping block is in close contact with the outer wall of the inner cylinder connecting sleeve, while the inner side of the upper part of the movable clamping block forms a threaded engagement connection with the rod body of the threaded rod.

[0006] As a further embodiment of this utility model: rotating rods are fixedly connected to both sides of the upper end of the outer cylinder, and an inwardly inclined bottom edge is connected to the bottom end of the outer cylinder, with the inwardly inclined bottom edge abutting against part of the blade of the annular soil cutting blade.

[0007] As a further embodiment of this utility model: a number of bearings are connected between the outer cylinder and the inner cylinder, and multiple sets of annular grooves are opened on the cylinder wall where the outer cylinder and the inner cylinder are in contact, and the bearings are fixedly placed in the corresponding grooves.

[0008] As a further embodiment of this utility model: the upper outer wall of the inner cylinder connecting sleeve is conical, and the upper outer wall of the inner cylinder connecting sleeve is provided with external friction texture; the lower inner side of the movable clamping block is conical to match the upper outer wall of the inner cylinder connecting sleeve, and the lower inner side of the movable clamping block is provided with internal friction texture.

[0009] As a further improvement of this utility model: the inner side of the upper part of the movable clamping block is adapted to the body of the threaded rod, and the inner side of the upper part of the movable clamping block is provided with a mating internal thread.

[0010] As a further embodiment of this utility model: a mating seat is fixedly connected to the center of the upper plate of the push plate, the bottom end of the threaded rod is inserted into the inner cavity of the mating seat, and the bottom end of the threaded rod located in the inner cavity of the mating seat is connected to a fine-tuning base plate. Two springs are provided in the mating seat, one of which elastically abuts against the bottom surface of the inner cavity of the mating seat and the lower plate surface of the fine-tuning base plate, and the other spring is sleeved on the rod body of the threaded rod, and the other spring elastically abuts against the top surface of the inner cavity of the mating seat and the upper plate surface of the fine-tuning base plate.

[0011] As a further improvement of this utility model: the top end of the threaded rod movably penetrates the outer cylinder connecting sleeve, and the top end of the threaded rod is fixedly connected to a coaxially arranged rotating handle.

[0012] As a further improvement of this utility model, the hydraulic locking assembly also includes an active hydraulic cylinder and a driven hydraulic cylinder. The cylinder body of the active hydraulic cylinder is fixedly connected to the outer wall of the outer cylinder docking sleeve. There are two driven hydraulic cylinders arranged symmetrically, and the cylinder bodies of the two driven hydraulic cylinders are fixedly embedded in the tube body of the outer cylinder docking sleeve. The front end of the piston rod of the driven hydraulic cylinder is fixedly connected to the movable clamping block. A hydraulic delivery pipe connects the active hydraulic cylinder and the driven hydraulic cylinder.

[0013] The beneficial effects of this utility model are: 1. This utility model uses an outer cylinder and an inner cylinder that can be rotatably connected, combined with the spiral blade on the outer wall of the outer cylinder and the annular soil cutting blade at the bottom of the inner cylinder, to achieve a division of labor mode in which the outer cylinder rotates for excavation and the inner cylinder presses down for sampling, thus avoiding disturbance to the soil layer caused by the rotation of the inner cylinder and ensuring the original state of the soil sample. 2. This utility model provides a hydraulic locking assembly between the outer cylinder docking sleeve at the top of the outer cylinder and the inner cylinder docking sleeve at the top of the inner cylinder. The assembly includes two symmetrically arranged movable clamping blocks. Each movable clamping block is radially movable and installed inside the outer cylinder docking sleeve and has an upper block body and a lower block body. When locked, the lower block body is in close contact with the outer wall of the inner cylinder docking sleeve to achieve axial and circumferential fixation of the outer cylinder and the inner cylinder. At the same time, the upper block body forms a threaded engagement connection with the threaded rod, integrating locking and transmission into one, eliminating the need for additional clutch or manual assembly steps. 3. This utility model has a push plate and a threaded rod fixed thereon that are movably installed inside the inner cylinder. Initially, the push plate is located at the bottom of the inner cylinder. During the sampling process, it is automatically pushed upward as the soil sample enters, without the need for manual installation. 4. In this invention, when the threaded rod is rotated, the push plate smoothly pushes out the soil column downwards, avoiding secondary disturbances caused by knocking or impact from the top rod. Furthermore, the push plate's travel directly reflects the sampling depth, serving as a depth indicator. In the unlocked state, gaps are maintained between the movable clamping block, the inner cylinder connecting sleeve, and the threaded rod, ensuring the threaded rod can move freely upwards without obstruction during sampling. The push plate floats freely as the soil sample enters, without interfering with the normal entry of the soil sample. After locking, rotating the threaded rod completes the sample removal process. No tool changes or manual assembly of any auxiliary devices are required, greatly simplifying the operational procedures for field surveying and sampling of forest and grassland resources, and improving sampling efficiency and soil sample representativeness. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the outer cylinder connecting sleeve and the inner cylinder connecting sleeve of this utility model; Figure 3 This is a schematic diagram of the connection structure between the push plate and the threaded rod of this utility model; Figure 4 This is a schematic diagram showing the disassembled structure of the outer cylinder, inner cylinder, and bearing of this utility model; Figure 5 This is a schematic diagram of the top structure of the outer cylinder of this utility model; Figure 6 This is a schematic diagram of the internal cross-sectional structure of the outer cylinder connecting sleeve of this utility model; Figure 7 This is a schematic diagram of the inner cylinder connecting sleeve and threaded rod installation structure of this utility model; Figure 8 This is a schematic diagram of the structure of the movable clamping block and the inner cylinder connecting sleeve in the unlocked state. Figure 9 This is a schematic diagram of the cross-sectional structure of the movable clamping block of this utility model; Figure 10 This is a schematic diagram of the internal structure of the docking seat of this utility model.

[0015] In the diagram: 1. Outer cylinder; 11. Rotating rod; 12. Outer cylinder mating sleeve; 13. Inclined bottom edge; 2. Inner cylinder; 21. Inner cylinder mating sleeve; 22. External friction texture; 3. Spiral blade; 4. Annular cutting blade; 5. Bearing; 6. Push plate; 61. Docking seat; 7. Threaded rod; 71. Rotating handle; 72. Fine-tuning base plate; 8. Hydraulic locking assembly; 81. Active hydraulic cylinder; 82. Hydraulic delivery pipe; 83. Driven hydraulic cylinder; 84. Movable clamping block; 85. Internal threaded mating; 86. Internal friction texture; 9. Spring. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example 1 like Figures 1 to 10 As shown, a forest and grassland resource mapping sampler includes an outer cylinder 1 and an inner cylinder 2 that are rotatably connected to each other. A spiral blade 3 is fixedly connected to the outer wall of the outer cylinder 1, and an annular soil cutting blade 4 is fixedly connected to the bottom end of the inner cylinder 2. When the operator rotates the outer cylinder 1, the spiral blade 3 on the outer wall of the outer cylinder 1 can generate a downward digging force during the rotation, which smoothly screws the outer cylinder 1 into the soil layer. Since the inner cylinder 2 is rotatably connected to the outer cylinder 1, the annular soil cutting blade 4 at its bottom end only moves downward with the outer cylinder 1 but does not rotate with it. This cuts the soil and receives the soil column in a vertical downward pressing manner, avoiding additional disturbance to the soil structure caused by the rotation of the inner cylinder 2. At the same time, the spiral chip removal effect of the spiral blade 3 can discharge the excess soil generated during the drilling process upward, preventing the soil layer from being over-compacted. The top of the outer cylinder 1 is fixedly connected to the outer cylinder connecting sleeve 12, and the top of the inner cylinder 2 is fixedly connected to the inner cylinder connecting sleeve 21. A hydraulic locking assembly 8 is provided between the outer cylinder connecting sleeve 12 and the inner cylinder connecting sleeve 21. During the process of the sampler drilling into the soil layer, the outer cylinder 1 and the inner cylinder 2 are in a state of relative rotation to meet the different movement requirements of the spiral blade 3 rotating and the annular cutting blade 4 pressing vertically. When the sampling depth reaches the required level, the outer cylinder connecting sleeve 12 and the inner cylinder connecting sleeve 21 are locked by the hydraulic locking assembly 8, so that the outer cylinder 1 and the inner cylinder 2 no longer rotate relative to each other, thereby enabling the two together with the soil sample inside to be pulled out of the soil layer as a whole. The hydraulic locking assembly 8 includes two symmetrically arranged movable clamping blocks 84. Each movable clamping block 84 is radially movable and installed inside the outer cylinder connecting sleeve 12. The movable clamping block 84 has an upper block body and a lower block body. The symmetrical arrangement of the movable clamping blocks 84 makes the locking force evenly distributed in the circumferential direction of the inner cylinder connecting sleeve 21, avoiding the problem of the inner cylinder 2 being tilted or the locking being unreliable due to unilateral locking. The lower block body of the movable clamping block 84 is used to clamp the outer wall of the inner cylinder connecting sleeve 21, realizing the axial and circumferential fixation of the outer cylinder 1 and the inner cylinder 2. The upper block body of the movable clamping block 84 is used to form a threaded engagement with the threaded rod 7 while clamping, providing a transmission connection for the subsequent rotation of the push plate 6 to push out the soil sample. The locking of the outer cylinder 1 and the inner cylinder 2 and the transmission engagement of the movable clamping block 84 and the threaded rod 7 can be completed simultaneously by the radial movement of the movable clamping block 84. The inner cylinder 2 is equipped with a push plate 6 and a threaded rod 7 fixedly connected to the upper surface of the push plate 6. With the design of the gap and engagement state of the movable clamping block 84, the push plate 6 floats upward as the soil sample enters during the sampling process, and the push plate 6 is driven downward to push out the soil sample after sampling by the threaded rod 7. In the unlocked state, gaps are left between the inner side of the movable clamping block 84 and the outer wall of the inner cylinder connecting sleeve 21, as well as between the inner side of the movable clamping block 84 and the rod body of the threaded rod 7. When the hydraulic locking assembly 8 drives the movable clamping block 84 to move radially inward, the inner side of the lower part of the movable clamping block 84 is in close contact with the outer wall of the inner cylinder connecting sleeve 21, while the inner side of the upper part of the movable clamping block 84 forms a threaded engagement connection with the rod body of the threaded rod 7. Since there is a gap between the inner side of the movable clamping block 84 and the rod body of the threaded rod 7 in the unlocked state, the upward movement of the threaded rod 7 will not be hindered by the movable clamping block 84. The push plate 6 can rise freely with the soil sample and will not interfere with the normal entry of the soil sample. Once the sampling depth reaches the required level, the operator drives the movable clamping block 84 radially inward using the hydraulic locking assembly 8. At this time, the inner side of the lower part of the movable clamping block 84 is tightly pressed against the outer wall of the inner cylinder connecting sleeve 21, locking the outer cylinder 1 and the inner cylinder 2 together for easy removal. Simultaneously, the inner side of the upper part of the movable clamping block 84 forms a threaded engagement with the rod body of the threaded rod 7. Rotating the threaded rod 7 then drives the push plate 6 to move downward within the inner cavity of the inner cylinder 2. Since the push plate 6 is positioned at the upper part of the inner cavity of the inner cylinder 2 after being lifted by the soil sample, moving the push plate 6 downward will remove the soil column from the inner cylinder 2. The bottom is pushed out evenly, meaning that the push plate 6 floats freely upwards as the soil sample enters during the sampling process, without causing any additional compression or disturbance to the soil sample, thus ensuring the original structure of the soil sample. The pushing force of the soil sample comes from the downward axial movement of the push plate 6 rather than from knocking or the impact of the top rod, which can maintain the integrity and stratification structure of the soil column. The rotational pushing method of the threaded rod 7 makes the pushing process smooth and controllable, avoiding the soil sample from becoming loose or misaligned due to impact force. The engagement and disengagement of the threaded mesh are fully realized automatically by the radial movement of the movable clamp 84, without the need for operators to manually align the threads or install additional pushing devices.

[0018] Example 2 Improvements based on Example 1: like Figure 1 , Figure 2 and Figure 4As shown, rotating rods 11 are fixedly connected to both sides of the upper end of the outer cylinder 1. The bottom end of the outer cylinder 1 is connected to an inwardly inclined bottom edge 13, which abuts against part of the blade of the annular cutting blade 4. The rotating rods 11 provide the operator with a force point to hold and rotate the outer cylinder 1 with both hands, making the rotation operation more labor-saving when the outer cylinder 1 needs to be continuously rotated to make the spiral blade 3 dig downward. At the same time, it provides an auxiliary force point for pulling upward when the sampler is pulled out, which is convenient for the operator to lock the hydraulic locking assembly 8. After positioning, the entire sampler is pulled out of the soil layer. The inward-sloping bottom edge 13 provides lateral support to the lower edge of the annular cutting blade 4, preventing the annular cutting blade 4 from bending laterally when cutting into hard soil layers or encountering stones. In addition, the contact between the inward-sloping bottom edge 13 and part of the annular cutting blade 4 does not hinder the cutting function of the annular cutting blade 4, making the bottom structure of the sampler more robust and durable. It is especially suitable for sampling complex soil layers containing gravel or hard roots, which are often encountered in forestry and grassland resource surveying.

[0019] Furthermore, several bearings 5 ​​are connected between the outer cylinder 1 and the inner cylinder 2. Multiple sets of annular grooves are opened on the cylinder walls where the outer cylinder 1 and the inner cylinder 2 are in contact. The bearings 5 ​​are fixedly placed in the corresponding grooves. The bearings 5 ​​make the contact between the outer cylinder 1 and the inner cylinder 2 a rolling friction contact, reducing the frictional resistance when they rotate relative to each other. This makes it easier for the operator to rotate the outer cylinder 1. The grooves also allow the bearings 5 ​​to be fixedly placed, preventing axial displacement or circumferential movement of the bearings 5 ​​during use.

[0020] like Figures 5 to 9 As shown, the upper outer wall of the inner cylinder connecting sleeve 21 is conical, and the upper outer wall of the inner cylinder connecting sleeve 21 is provided with external friction texture 22. The lower inner side of the movable clamping block 84 is conical to match the upper outer wall of the inner cylinder connecting sleeve 21, and the lower inner side of the movable clamping block 84 is provided with internal friction texture 86. When the movable clamping block 84 moves radially inward, the conical surface can produce a wedge-shaped self-locking effect, ensuring that the inner cylinder 2 and the outer cylinder 1 can be firmly combined together. Secondly, the external friction texture 22 and the internal friction texture 86 cooperate with each other, further increasing the friction coefficient between the contact surfaces on the basis of the conical surface contact, preventing relative rotation between the outer cylinder 1 and the inner cylinder 2 during the extraction of the soil sample. It should be noted that the external friction texture 22 and the internal friction texture 86 can adopt fine knurling, axial straight knurling or spiral knurling, which can provide reliable anti-rotation function when clamped, and will not cause additional resistance to the radial movement of the movable clamping block 84 in the non-locked state.

[0021] Furthermore, the inner side of the upper part of the movable clamping block 84 is adapted to the rod body of the threaded rod 7, and the inner side of the upper part of the movable clamping block 84 is provided with a mating internal thread 85. When the hydraulic locking assembly 8 drives the movable clamping block 84 to move radially inward, the mating internal thread 85 and the external thread on the rod body of the threaded rod 7 form a threaded engagement connection, converting the radial movement of the movable clamping block 84 into axial threaded locking, so that when the threaded rod 7 is rotated, the push plate 6 can be driven to move downward through the threaded pair. The mating internal thread 85 is located on the upper part of the movable clamping block 84, which is axially offset from the function of the lower part of the block for locking the inner cylinder mating sleeve 21, ensuring that the two functions do not interfere with each other, while sharing a common drive source.

[0022] like Figure 3 , Figure 5 and Figure 10 As shown, a mating seat 61 is fixedly connected to the center of the upper plate of the push plate 6. The bottom end of the threaded rod 7 is inserted into the inner cavity of the mating seat 61. The bottom end of the threaded rod 7 located in the inner cavity of the mating seat 61 is connected to a fine-tuning base plate 72. Two springs 9 are provided inside the mating seat 61. One spring 9 elastically abuts against the bottom surface of the inner cavity of the mating seat 61 and the lower plate surface of the fine-tuning base plate 72. The other spring 9 is sleeved on the rod body of the threaded rod 7, and the other spring 9 elastically abuts against the top surface of the inner cavity of the mating seat 61 and the upper plate surface of the fine-tuning base plate 72. The elastic floating connection allows for a slight axial relative displacement between the threaded rod 7 and the push plate 6, ensuring that the inner side of the upper block of the movable clamping block 84 can smoothly form a threaded engagement with the rod body of the threaded rod 7. The elastic floating connection also allows the threaded rod 7 to automatically fine-tune its axial position within the cavity of the mating seat 61, ensuring that when the movable clamping block 84 moves radially inward, the external thread on the rod body of the threaded rod 7 can be precisely aligned with the mating internal thread 85 on the movable clamping block 84, thus avoiding thread collision damage or failure to engage caused by rigid misalignment.

[0023] Furthermore, the top end of the threaded rod 7 moves through the outer cylinder connecting sleeve 12, and the top end of the threaded rod 7 is fixedly connected to a coaxially arranged rotating handle 71. The coaxially arranged rotating handle 71 allows the operator to easily rotate the threaded rod 7 with both hands or one hand. The rotating handle 71 provides a larger lever arm, thereby increasing the torque applied by the operator and making the process of pushing out the soil sample more labor-saving.

[0024] like Figure 5 , Figure 6 , Figure 8 and Figure 9As shown, the hydraulic locking assembly 8 also includes an active hydraulic cylinder 81 and a driven hydraulic cylinder 83. The cylinder body of the active hydraulic cylinder 81 is fixedly connected to the outer wall of the outer cylinder docking sleeve 12. Two driven hydraulic cylinders 83 are symmetrically arranged, and the cylinder bodies of the two driven hydraulic cylinders 83 are fixedly embedded inside the tube body of the outer cylinder docking sleeve 12. The front end of the piston rod of the driven hydraulic cylinder 83 is fixedly connected to the movable clamping block 84. A hydraulic delivery pipe 82 connects the active hydraulic cylinder 81 and the driven hydraulic cylinder 83. It should be noted that the active hydraulic cylinder 81 can be a manual hydraulic cylinder disclosed in the announcement number CN208651318U, and the driven hydraulic cylinder 83 can be a lever hydraulic cylinder product conforming to ISO6020 / 2 and DIN24554 standards. Both the active hydraulic cylinder 81 and the driven hydraulic cylinder 83 are products skilled in the art. As is known and need not be elaborated, the operator can generate hydraulic pressure by manually rotating the piston rod of the active hydraulic cylinder 81. This pressure is transmitted to two driven hydraulic cylinders 83 through the hydraulic delivery pipe 82. The two driven hydraulic cylinders 83 receive hydraulic pressure from the same active hydraulic cylinder 81 through the connection of the hydraulic delivery pipe 82. Therefore, the piston rods of the two driven hydraulic cylinders 83 can extend synchronously, driving the two movable clamping blocks 84 to move radially inward from both sides at the same speed and with the same force. This ensures that the clamping force of the movable clamping blocks 84 on the inner cylinder connecting sleeve 21 and the threaded rod 7 is uniform and symmetrical, avoiding the problem of uneven load and imbalance caused by unilateral clamping. When unlocking is required, the piston rod of the active hydraulic cylinder 81 is manually rotated in the opposite direction to allow the hydraulic oil to flow back, and the movable clamping blocks 84 return to their original position to release the lock, so as to facilitate the next sampling.

[0025] Working principle: In the initial state, the push plate 6 is located at the bottom of the inner cylinder 2, the threaded rod 7 is fixedly connected to the upper plate surface of the push plate 6 and extends upward, the movable clamping block 84 is in a non-locking state, and there are gaps between the inner side of the movable clamping block 84 and the outer wall of the inner cylinder connecting sleeve 21, as well as between the inner side of the movable clamping block 84 and the rod body of the threaded rod 7. The operator places the sampler vertically above the sampling point, ensuring the annular cutting blade 4 contacts the ground. Then, holding the rotating rods 11 fixedly connected to both sides of the upper end of the outer cylinder 1, the operator begins to rotate the outer cylinder 1. The spiral blade 3 fixedly connected to the outer wall of the outer cylinder 1 generates a downward digging force during rotation, driving the outer cylinder 1 to smoothly spin into the soil layer. The inner cylinder 2 is rotatably connected to the outer cylinder 1 via several bearings 5. Therefore, the annular cutting blade 4 at the bottom of the inner cylinder 2 moves downward with the outer cylinder 1 but does not rotate with it, thus cutting the soil and receiving the soil column in a vertical downward pressing manner. As the sampler goes deeper, the soil sample enters the inner cavity of the inner cylinder 2 from the bottom end. The soil sample generates an upward pushing force on the lower surface of the push plate 6. The push plate 6, along with the threaded rod 7, is gradually lifted upward by the soil sample. At the same time, the spiral cutting action of the spiral blade 3 removes excess soil generated during drilling upward, preventing excessive compaction of the soil layer. Once the sampling depth reaches the required level, the operator operates the active hydraulic cylinder 81. The active hydraulic cylinder 81 can adopt a manually rotated threaded drive structure. By manually rotating the piston rod of the active hydraulic cylinder 81, hydraulic pressure is generated. This pressure is transmitted to two driven hydraulic cylinders 83 through the hydraulic delivery pipe 82. The cylinder bodies of the two driven hydraulic cylinders 83 are fixedly embedded inside the tube body of the outer cylinder docking sleeve 12. The front end of their piston rods is fixedly connected to the movable clamping block 84. Under the drive of hydraulic pressure, the piston rods of the two driven hydraulic cylinders 83 extend synchronously, driving the two movable clamping blocks 84 to move radially inward. The inner side of the lower block body of the movable clamping block 84 is in close contact with the outer wall of the inner cylinder docking sleeve 21, creating a wedge-shaped self-locking effect. At the same time, the conical surface guides automatic centering, so that the outer cylinder 1 and the inner cylinder 2 are axially and circumferentially fixed, and no more relative rotation occurs. Meanwhile, the inner side of the upper block body of the movable clamping block 84 forms a threaded engagement connection with the external thread on the threaded rod 7. After locking is completed, the operator pulls upward using the rotating rod 11 to pull the outer cylinder 1, inner cylinder 2, and the soil sample out of the soil layer as a whole. Then, the operator holds the rotating handle 71, which is coaxially set at the top of the threaded rod 7, and rotates it. Since the inner side of the upper part of the movable clamping block 84 has formed a threaded engagement with the threaded rod 7, the rotational motion is converted into the downward axial movement of the push plate 6 through the threaded pair. The push plate 6 moves downward from the upper position after being lifted by the soil sample, and pushes the soil column in the inner cylinder 2 out smoothly and evenly from the bottom, thus completing the soil sample collection. When unlocking is required, manually rotate the piston rod of the active hydraulic cylinder 81 in the reverse direction to allow the hydraulic oil to flow back, and the movable clamp 84 will return to its original position to release the lock, so that it can be used for the next sampling.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A forest and grassland resource mapping sampler, comprising an outer cylinder (1) and an inner cylinder (2) that are rotatably fitted together, characterized in that: The outer wall of the outer cylinder (1) is fixedly connected with a spiral blade (3), and the bottom end of the inner cylinder (2) is fixedly connected with a ring-shaped soil cutter (4). The top end of the outer cylinder (1) is fixedly connected to an outer cylinder docking sleeve (12), the top end of the inner cylinder (2) is fixedly connected to an inner cylinder docking sleeve (21), and a hydraulic locking assembly (8) is provided between the outer cylinder docking sleeve (12) and the inner cylinder docking sleeve (21). The hydraulic locking assembly (8) includes two movable clamping blocks (84) arranged symmetrically. Each movable clamping block (84) is radially movable and installed inside the outer cylinder connecting sleeve (12). The movable clamping block (84) has an upper block body and a lower block body. The inner cylinder (2) is equipped with a push plate (6) and a threaded rod (7) fixedly connected to the upper surface of the push plate (6); In the unlocked state, there are gaps between the inner side of the movable clamp (84) and the outer wall of the inner cylinder connecting sleeve (21) and between the inner side of the movable clamp (84) and the rod body of the threaded rod (7). When the hydraulic locking assembly (8) drives the movable clamping block (84) to move radially inward, the inner side of the lower part of the movable clamping block (84) is in close contact with the outer wall of the inner cylinder connecting sleeve (21), and at the same time, the inner side of the upper part of the movable clamping block (84) forms a threaded engagement connection with the rod body of the threaded rod (7).

2. The forest and grassland resource mapping and sampling device according to claim 1, characterized in that: Rotating rods (11) are fixedly connected to both sides of the upper end of the outer cylinder (1). The bottom end of the outer cylinder (1) is connected to an inwardly inclined bottom edge (13) that is inwardly tapered, and the inwardly inclined bottom edge (13) abuts against part of the blade of the annular soil cutter (4).

3. The forest and grassland resource mapping and sampling device according to claim 1, characterized in that: A number of bearings (5) are connected between the outer cylinder (1) and the inner cylinder (2). Multiple sets of annular grooves are opened on the cylinder walls where the outer cylinder (1) and the inner cylinder (2) are in contact. The bearings (5) are fixedly placed in the corresponding grooves.

4. The forest and grassland resource mapping and sampling device according to claim 1, characterized in that: The upper outer wall of the inner cylinder connecting sleeve (21) is conical, and the upper outer wall of the inner cylinder connecting sleeve (21) is provided with external friction texture (22). The lower inner side of the movable clamping block (84) is conical and adapted to the upper outer wall of the inner cylinder connecting sleeve (21). The lower inner side of the movable clamping block (84) is provided with internal friction texture (86).

5. The forest and grassland resource mapping and sampling device according to claim 1, characterized in that: The inner side of the upper part of the movable clamping block (84) is adapted to the rod body of the threaded rod (7), and the inner side of the upper part of the movable clamping block (84) is provided with a mating internal thread (85).

6. The forest and grassland resource mapping and sampling device according to claim 1, characterized in that: The center of the upper plate of the push plate (6) is fixedly connected to a docking seat (61). The bottom end of the threaded rod (7) is inserted into the inner cavity of the docking seat (61). The bottom end of the threaded rod (7) in the inner cavity of the docking seat (61) is connected to a fine-tuning base plate (72). The docking seat (61) is provided with two springs (9). One of the springs (9) elastically abuts between the bottom surface of the inner cavity of the docking seat (61) and the lower plate surface of the fine-tuning base plate (72). The other spring (9) is sleeved on the rod body of the threaded rod (7) and elastically abuts between the top surface of the inner cavity of the docking seat (61) and the upper plate surface of the fine-tuning base plate (72).

7. The forest and grassland resource mapping and sampling device according to claim 1, characterized in that: The top end of the threaded rod (7) moves through the outer cylinder connecting sleeve (12), and the top end of the threaded rod (7) is fixedly connected to a rotating handle (71) arranged coaxially.

8. The forest and grassland resource mapping and sampling device according to claim 1, characterized in that: The hydraulic locking assembly (8) further includes an active hydraulic cylinder (81) and a driven hydraulic cylinder (83). The cylinder body of the active hydraulic cylinder (81) is fixedly connected to the outer wall of the outer cylinder docking sleeve (12). There are two driven hydraulic cylinders (83) arranged symmetrically, and the cylinder bodies of the two driven hydraulic cylinders (83) are fixedly embedded in the tube body of the outer cylinder docking sleeve (12). The front end of the piston rod of the driven hydraulic cylinder (83) is fixedly connected to the movable clamping block (84). A hydraulic delivery pipe (82) connects the active hydraulic cylinder (81) and the driven hydraulic cylinder (83).

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