Anti-insertion structure for a coring machine

Abstract

The utility model provides a kind of anti-insertion structure for sampling machine, including sampling rod, cantilever, first mounting sleeve, inductive switch and trigger piece.Cantilever, cantilever includes upper cantilever, lower cantilever and the mounting bracket connected between upper cantilever and lower cantilever;First mounting sleeve, with sampling rod fixed sleeve, and it is slidably arranged in mounting bracket, so that sampling rod can be slid up and down along the length direction of mounting bracket.Inductive switch, fixedly installed on mounting bracket;Trigger piece, fixed on first mounting sleeve. Wherein, in initial state, trigger piece is spaced apart from inductive switch;When the bottom end of sampling rod contacts the bottom of vehicle, sampling rod drives first mounting sleeve to slide upwards along mounting bracket, so that trigger piece moves to the position of triggering inductive switch;Controller, electrically connected with inductive switch, for lifting cantilever when inductive switch is triggered.The present application can reduce the damage of carriage floor.

Description

Technical Field

[0001] This application relates to the field of sample cutting machine technology, and more specifically, to an anti-penetration structure for a sample cutting machine. Background Technology

[0002] Grain sampling is a crucial step in the grain harvesting, storage, and inspection process, involving the extraction of representative samples from grain transport vehicles. Currently, most commercially available sampling machines use a rigid, round rod with a tapered or beveled tip for insertion into the grain pile. However, in practice, variations in vehicle type, load capacity, and tire pressure lead to significant differences in the height of the truck bed, frequently resulting in the sampling rod piercing the steel floorboards.

[0003] The common method of installing the sampling rod is to fix it on the cantilever and raise and lower it together with the cantilever. Manufacturers usually use parameters such as the torque or current of the servo motor to determine whether the sampling rod has reached the bottom of the vehicle. This method has low accuracy and may result in misjudgment that leads to the rod penetrating the bottom of the vehicle, or the insertion depth may be too shallow, affecting the sampling results. Utility Model Content

[0004] This application provides an anti-penetration structure for a sampler, which can reduce damage to the base plate.

[0005] Specifically, this application is implemented through the following technical solution: This application provides an anti-penetration structure for a profiling machine, comprising: Sampling rod; A cantilever, the cantilever comprising an upper cantilever, a lower cantilever, and a mounting bracket connecting the upper cantilever and the lower cantilever; The first mounting sleeve is fixedly mounted to the sampling rod and slidably disposed on the mounting frame, so that the sampling rod can slide up and down along the length direction of the mounting frame; An inductive switch is fixedly installed on the mounting bracket; The trigger element is fixed to the first mounting sleeve; In the initial state, the trigger and the inductive switch are spaced apart; when the bottom end of the sampling rod contacts the bottom of the vehicle, the sampling rod drives the first mounting sleeve to slide upward along the mounting frame, so that the trigger moves to the position to trigger the inductive switch; A controller, electrically connected to the inductive switch, is used to control the cantilever to lift when the inductive switch is triggered.

[0006] Optionally, a first elastic element is provided between the first mounting sleeve and the mounting frame; the first elastic element applies a downward preload to the first mounting sleeve, the preload being greater than the resistance of the grain to the rod but less than the supporting force of the vehicle bottom to the rod, so that the sampling rod can only overcome the preload and float upward when it contacts the bottom of the vehicle.

[0007] Optionally, a second mounting sleeve is also fixedly mounted on the mounting bracket, the second mounting sleeve being located above the first mounting sleeve; the sampling rod passes through the first mounting sleeve and the second mounting sleeve in sequence, the sampling rod is fixedly mounted to the first mounting sleeve, and there is a gap between the sampling rod and the inner wall of the second mounting sleeve; the first elastic element is a compression spring sleeved on the outside of the sampling rod, and is supported between the first mounting sleeve and the second mounting sleeve.

[0008] Optionally, the trigger is an L-shaped baffle fixed to the upper surface of the first mounting sleeve; a portion of the L-shaped baffle extends upward to form a stop for limiting the compression spring, and the L-shaped baffle includes a lateral extension that extends laterally out of the lateral edge of the first mounting sleeve; the inductive switch is mounted on a moving path above the lateral extension.

[0009] Optionally, the first mounting sleeve has an inner mounting hole for the sampling rod to pass through, and a sampling rod removal and replacement assembly is provided on the side wall of the inner mounting hole. The sampling rod removal and replacement assembly includes: The elastic locking structure includes two locking blocks and two second elastic elements. The two locking blocks are symmetrically arranged on both sides of the mounting inner hole. One end of the second elastic element is fixed to the first mounting sleeve, and the other end is connected to the locking block. The locking block is configured to have a tendency to move away from the sampling rod under the pulling force of the second elastic element. The synchronous push structure includes two lead screws, each of which is connected to a lead screw nut. The two lead screws are rotatably mounted on the first mounting sleeve and located on both sides of the mounting inner hole. The lead screw nut and the locking block on the same side are engaged by abutting with the inclined surface. The sample rod disassembly and replacement assembly has a first state and a second state: In the first state, the second elastic element pulls the locking block, so that it is spaced apart from the sampling rod; In the second state, the two lead screws rotate synchronously in the same direction, driving the lead screw nuts on them to move synchronously, and pushing the two locking blocks to move towards each other through the inclined plane, so as to overcome the tension of the second elastic element and lock the sampling rod together.

[0010] Optionally, the lead screw includes a first threaded section and a second threaded section, the first threaded section and the second threaded section having opposite thread directions; each lead screw is connected to two lead screw nuts, which respectively mate with the first threaded section and the second threaded section; The two lead screw nuts and the two ends of the locking block on the same side abut against each other through symmetrically arranged inclined surfaces; when the lead screw is rotated, the two lead screw nuts on the same lead screw move synchronously towards or away from each other.

[0011] Optionally, the two lead screws are connected to the drive motor via a transmission structure; The first transmission gear is rotatably fitted onto the outer periphery of the first mounting sleeve, and its rotation axis coincides with the axis of the mounting inner hole. Furthermore, the center of the first transmission gear is provided with a clearance hole with a diameter larger than that of the mounting inner hole. The first transmission gear is connected to the output shaft of the drive motor via a gear pair. The second and third transmission gears are coaxially fixedly mounted on the ends of the two lead screws, respectively; The synchronous belt is fitted onto the first transmission gear, the second transmission gear, and the third transmission gear so that the drive motor can synchronously drive the second transmission gear and the third transmission gear to rotate through the gear pair, the first transmission gear, and the synchronous belt.

[0012] Optionally, both the second and third transmission gears have positioning holes at their bottoms, and the first mounting sleeve has a corresponding positioning post; the positioning post cooperates with the positioning hole to achieve radial positioning of the second and third transmission gears.

[0013] Optionally, the inclined surface where the locking block and the lead screw nut abut against each other is an arc-shaped inclined surface.

[0014] This application provides an anti-penetration structure for a sampling machine. The sampling rod is slidably connected to the mounting frame via a first mounting sleeve, and a detection unit consisting of a trigger and a sensor switch is provided. During the descent for sampling, the static friction at the sliding connection between the first mounting sleeve and the mounting frame, along with the rod's own weight, is sufficient to overcome the grain resistance, ensuring the sampling rod descends synchronously with the cantilever, penetrating the entire depth of the grain pile and guaranteeing the integrity of the sampling stroke and the representativeness of the sample. When the bottom end of the sampling rod contacts the floor of the truck bed, a huge rigid reaction force instantly overcomes the static friction, pushing the sampling rod and the first mounting sleeve upwards relative to each other, quickly triggering the sensor switch. The controller then commands the cantilever to rapidly rise, causing the bottom end of the rod to quickly detach from the truck bed, minimizing damage to the floor. Attached Figure Description

[0015] Figure 1This is a schematic diagram of a prototyping machine based on the prior art of this application; Figure 2 This is a schematic diagram of the anti-penetration structure of a sampler shown in an exemplary embodiment of this application; Figure 3 This is a schematic diagram illustrating the disassembly and replacement assembly of the sampling rod in an exemplary embodiment of this application; Figure 4 This is a partial enlargement of the sampling rod disassembly and replacement assembly shown in an exemplary embodiment of this application. Figure 1 ; Figure 5 This is a partial enlargement of the sampling rod disassembly and replacement assembly shown in an exemplary embodiment of this application. Figure 2 ; Figure 6 This is a schematic diagram illustrating a lead screw and lead screw nut according to an exemplary embodiment of this application; Figure 7 This is a top view of a transmission structure shown in an exemplary embodiment of this application; Figure 8 This is a top view of a lead screw nut shown in an exemplary embodiment of this application.

[0016] Wherein: 100, sampling rod; 200, cantilever; 210, upper cantilever; 220, lower cantilever; 230, mounting bracket; 300, first mounting sleeve; 301, mounting inner hole; 400, inductive switch; 500, trigger element; 600, first elastic element; 700, second mounting sleeve; 800, sampling rod disassembly and replacement assembly; 810, elastic locking structure; 811, locking block; 812, second elastic element; 820, synchronous pushing structure; 821, lead screw; 821a, first threaded section; 821b, second threaded section; 822, lead screw nut; 830, transmission structure; 831, first transmission gear; 832, second transmission gear; 833, third transmission gear; 834, synchronous belt; 840, drive motor; 841, gear pair. Detailed Implementation

[0017] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0018] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0019] refer to Figure 1 and Figure 2 , Figure 1 During use, the profiling machine can easily pierce the floor plate of a vehicle. (Regarding...) Figure 1 In this application, an anti-insertion structure for a sampling machine is provided, including a sampling rod 100, a cantilever 200, a first mounting sleeve 300, a sensor switch 400, and a trigger 500. The cantilever 200 includes an upper cantilever 210, a lower cantilever 220, and a mounting frame 230 connecting the upper and lower cantilever arms 210 and 220. The first mounting sleeve 300 is fixedly fitted to the sampling rod 100 and slidably disposed on the mounting frame 230, allowing the sampling rod 100 to slide up and down along the length of the mounting frame 230. The sensor switch 400 is fixedly mounted on the mounting frame 230; the trigger 500 is fixedly mounted on the first mounting sleeve 300. In the initial state, the trigger 500 and the inductive switch 400 are spaced apart. When the bottom end of the sampling rod 100 contacts the bottom of the vehicle, the sampling rod 100 drives the first mounting sleeve 300 to slide upward along the mounting bracket 230, causing the trigger 500 to move to the position to trigger the inductive switch 400. The controller, electrically connected to the inductive switch 400, is used to control the cantilever 200 to lift when the inductive switch 400 is triggered. The bottom end of the sampling rod 100 can also be designed as a flat-top. Compared to a traditional pointed tip, the flat-top design significantly disperses pressure, transforming the potential risk of "puncture" into a safe "push."

[0020] The sampling rod 100 is slidably connected to the mounting frame 230 via the first mounting sleeve 300, and a detection unit consisting of a trigger 500 and a sensor switch 400 is provided. During the descent sampling process, the static friction force set at the sliding connection between the first mounting sleeve 300 and the mounting frame 230, along with the weight of the rod itself, is sufficient to overcome the resistance of the grain, thereby ensuring that the sampling rod 100 descends synchronously with the cantilever 200, penetrating the entire depth of the grain pile, ensuring the integrity of the sampling journey and the representativeness of the sample. When the bottom end of the sampling rod 100 contacts the floor of the carriage, the huge rigid reaction force instantly overcomes the aforementioned static friction force, pushing the sampling rod 100 and the first mounting sleeve 300 upward relative to each other, quickly triggering the sensor switch 400. The controller then instructs the cantilever 200 to rapidly rise, causing the bottom end of the rod to quickly detach from the floor of the carriage, minimizing damage to the floor.

[0021] refer to Figure 2 In one embodiment, a first elastic element 600 is provided between the first mounting sleeve 300 and the mounting bracket 230; the first elastic element 600 applies a downward preload to the first mounting sleeve 300, the preload being greater than the resistance of the grain to the rod but less than the support force of the vehicle bottom to the rod, so that the sampling rod 100 can only overcome the preload and float upward when it contacts the bottom of the vehicle.

[0022] In this embodiment, by setting the preload force to be greater than the grain resistance but less than the vehicle undercarriage support force, the sampling rod 100 remains stable throughout the entire sampling process through the grain pile, preventing erroneous floating due to ordinary uneven resistance and ensuring consistent sampling depth. Secondly, when the rod end truly touches the bottom, the first elastic element 600 is not a rigid entity; its compression process is a buffer stroke. This stroke provides the necessary displacement for triggering the inductive switch 400, and it absorbs some of the impact energy, making the entire bottom-touching response a soft contact rather than a hard collision, avoiding vibration or damage to the mechanism caused by instantaneous rigid impact.

[0023] In one embodiment, a second mounting sleeve 700 is also fixedly mounted on the mounting bracket 230, and the second mounting sleeve 700 is located above the first mounting sleeve 300. The sampling rod 100 passes through the first mounting sleeve 300 and the second mounting sleeve 700 in sequence. The sampling rod 100 is fixedly mounted to the first mounting sleeve 300 and has a gap between it and the inner wall of the second mounting sleeve 700. The first elastic element 600 is a compression spring sleeved on the outside of the sampling rod 100 and supported between the first mounting sleeve 300 and the second mounting sleeve 700. The second mounting sleeve 700 serves as a fixed upper fulcrum, constraining the compression spring together with the slidable first mounting sleeve 300. At the same time, the gap between the sampling rod 100 and the inner wall of the second mounting sleeve 700 ensures that the rod is only subjected to axial elastic support during floating, and is not subject to radial restraint, thus ensuring smooth floating.

[0024] In one embodiment, the trigger 500 is an L-shaped baffle fixed to the upper surface of the first mounting sleeve 300. A portion of the L-shaped baffle extends upward to form a retaining edge for limiting the compression spring, and the L-shaped baffle extends laterally beyond the lateral edge of the first mounting sleeve 300. The inductive switch 400 is mounted on the upper moving path of this laterally extended portion. Its upwardly extending vertical portion directly serves as the retaining edge of the compression spring, supporting the lower end of the spring. Its laterally extended portion constitutes the trigger arm. When the first mounting sleeve 300 moves upward, this trigger arm moves upward accordingly, thereby entering the effective detection area of ​​the inductive switch 400 or directly contacting and driving the physical switch. This mechanical direct triggering method has a short signal transmission path, extremely low delay, and strong anti-interference capability. It can stably convert the mechanical displacement signal of bottoming out into an electrical signal that can be recognized by the controller, thereby initiating the emergency lifting procedure.

[0025] refer to Figure 3 In one embodiment, the first mounting sleeve 300 has a mounting inner hole 301 for the sampling rod 100 to pass through. A sampling rod removal and replacement assembly 800 is provided on the side wall of the mounting inner hole 301. The sampling rod removal and replacement assembly 800 includes an elastic locking structure 810 and a synchronous pushing structure 820. Combined with... Figure 4 and Figure 5 The elastic locking structure 810 includes two locking blocks 811 and two second elastic elements 812. The two locking blocks 811 are symmetrically arranged on both sides of the mounting inner hole 301. One end of the second elastic element 812 is fixed to the first mounting sleeve 300, and the other end is connected to the locking block 811. The locking block 811 is configured to tend to move away from the sampling rod 100 under the pulling force of the second elastic element 812. The synchronous pushing structure 820 includes two lead screws 821, each lead screw 821 is connected to a lead screw nut 822. The two lead screws 821 are rotatably mounted on the first mounting sleeve 300 and located on both sides of the mounting inner hole 301. The lead screw nut 822 and the locking block 811 on the same side are engaged by abutting through an inclined surface. The sampling rod disassembly and replacement assembly 800 has a first state and a second state: In the first state, the second elastic element 812 pulls the locking block 811 so that it is spaced apart from the sampling rod 100; In the second state, the two lead screws 821 rotate synchronously in the same direction, driving the lead screw nut 822 on them to move synchronously, and pushing the two locking blocks 811 to move towards each other through the inclined plane, so as to overcome the pulling force of the second elastic element 812 and jointly lock the sampling rod 100.

[0026] Different grains, such as wheat and corn, may require different rod diameters, necessitating rod replacement. Specifically, in the first state, the tension provided by the second elastic element 812 automatically moves the two locking blocks 811 away from the rod's center, creating an open channel. This allows the operator to easily insert sampling rods 100 of different diameters directly into the mounting inner hole 301 from below the equipment until they reach the working position; the entire preparation process is tool-free and ensures good alignment. When locking is required, the drive screw 821 rotates to enter the second state. At this time, the screw nut 822 moves synchronously and interacts with the inclined surfaces on the locking blocks 811 through its inclined surface. This inclined surface engagement converts the axial movement of the screw nut into radial opposing movement of the locking blocks 811, thereby overcoming the tension of the second elastic element 812 and evenly clamping the sampling rod 100 from both sides. This design not only automatically adapts to diameter variations within a certain range, ensuring sufficient locking force for different rods, but also features a beveled fit with excellent self-locking characteristics after locking, preventing loosening due to vibration or other reasons during sampling operations, thus ensuring the stability and safety of the sampling process. The entire mechanism is compact and integrated into the side wall of the mounting inner hole 301 of the first mounting sleeve 300, without altering the core function of the original floating anti-collision mechanism, achieving a balance between quick replacement and reliable operation.

[0027] refer to Figure 6 In one embodiment, the lead screw 821 includes a first threaded section 821a and a second threaded section 821b, with the threads of the first threaded section 821a and the second threaded section 821b having opposite directions of rotation; each lead screw 821 is connected to two lead screw nuts 822, which respectively engage with the first threaded section 821a and the second threaded section 821b; the two lead screw nuts 822 abut against the two ends of the locking block 811 on the same side through symmetrically arranged inclined surfaces; when the lead screw 821 is rotated, the two lead screw nuts 822 on the same lead screw 821 move synchronously towards or away from each other.

[0028] This embodiment achieves synchronous driving of both ends of the locking block 811 on the same side by using a lead screw 821 with oppositely helical thread sections and two lead screw nuts 822. When the lead screw 821 rotates, the two nuts move simultaneously towards or away from each other, applying a uniform pushing force from both ends of the locking block 811 or achieving synchronous release through symmetrically arranged inclined surfaces. This symmetrical driving method effectively avoids possible jamming or deflection of the locking block 811 during movement, ensuring its smooth radial movement, thus making the locking action smoother and more reliable, and the clamping force distribution on the sampling rod 100 more uniform, improving the stability of the locking.

[0029] Combination Figure 7In one embodiment, two lead screws 821 are connected to a drive motor 840 via a transmission structure 830. A first transmission gear 831 is rotatably fitted onto the outer periphery of a first mounting sleeve 300, with its axis of rotation coinciding with the axis of the mounting inner hole 301. A clearance hole with a diameter larger than the mounting inner hole 301 is provided at the center of the first transmission gear 831. The first transmission gear 831 is meshed with the output shaft of the drive motor 840 via a gear pair 841. A second transmission gear 832 and a third transmission gear 833 are coaxially fixedly mounted at the ends of the two lead screws 821. A synchronous belt 834 is fitted onto the first transmission gear 831, the second transmission gear 832, and the third transmission gear 833, so that the drive motor 840 can synchronously drive the second transmission gear 832 and the third transmission gear 833 to rotate via the gear pair 841, the first transmission gear 831, and the synchronous belt 834.

[0030] In this embodiment, a single drive motor 840 can synchronously drive two far-away lead screws 821 to rotate, ensuring the consistency of the actions on both sides of the locking mechanism. The first transmission gear 831 is fitted around the outer periphery of the first mounting sleeve 300 and has a large-diameter clearance hole in its center, so that the entire transmission mechanism is cleverly arranged around the channel of the sampling rod 100, completely avoiding interference with the movement of the sampling rod 100 itself. This embodiment allows the operator to lock and unlock the rod by remotely controlling the motor, significantly improving the safety and convenience of operation.

[0031] In one embodiment, both the second transmission gear 832 and the third transmission gear 833 have positioning holes at their bottoms, and the first mounting sleeve 300 has corresponding positioning pins. The positioning pins cooperate with the positioning holes to achieve radial positioning of the second transmission gear 832 and the third transmission gear 833. This embodiment ensures that each gear maintains a stable relative position during rotation, thereby ensuring the smoothness and reliability of the synchronous belt 834 transmission.

[0032] Combination Figure 8 In one embodiment, the inclined surface of the locking block 811 that abuts against the lead screw nut 822 is an arc-shaped inclined surface. This arc-shaped surface can better fit the shape of the cylindrical mounting inner hole 301. When the lead screw nut 822 pushes the locking block 811, the arc-shaped inclined surface can increase the effective contact area, which helps it move smoothly.

[0033] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A penetration-proof structure for a sample sieving machine, characterized in that, include: Sampling rod (100); The cantilever (200) includes an upper cantilever (210), a lower cantilever (220), and a mounting bracket (230) connecting the upper cantilever (210) and the lower cantilever (220). The first mounting sleeve (300) is fixedly fitted with the sampling rod (100) and slidably disposed on the mounting frame (230), so that the sampling rod (100) can slide up and down along the length direction of the mounting frame (230); A motion sensor switch (400) is fixedly mounted on the mounting bracket (230); The trigger element (500) is fixed to the first mounting sleeve (300); In the initial state, the trigger (500) and the inductive switch (400) are spaced apart; when the bottom end of the sampling rod (100) contacts the bottom of the vehicle, the sampling rod (100) drives the first mounting sleeve (300) to slide upward along the mounting bracket (230), so that the trigger (500) moves to the position to trigger the inductive switch (400); A controller, electrically connected to the inductive switch (400), is used to control the cantilever (200) to lift when the inductive switch (400) is triggered.

2. The anti-penetration structure for a sampler as described in claim 1, characterized in that, A first elastic element (600) is provided between the first mounting sleeve (300) and the mounting bracket (230); the first elastic element (600) applies a downward preload to the first mounting sleeve (300), which is greater than the resistance of the grain to the rod body but less than the support force of the vehicle bottom to the rod body, so that the sampling rod (100) can only overcome the preload and float upward when it contacts the bottom of the vehicle.

3. The anti-penetration structure for a sampler as described in claim 2, characterized in that, A second mounting sleeve (700) is also fixedly mounted on the mounting bracket (230), the second mounting sleeve (700) being located above the first mounting sleeve (300); the sampling rod (100) passes through the first mounting sleeve (300) and the second mounting sleeve (700) in sequence, the sampling rod (100) is fixedly mounted to the first mounting sleeve (300), and there is a gap between the sampling rod (100) and the inner wall of the second mounting sleeve (700); the first elastic element (600) is a compression spring sleeved on the outside of the sampling rod (100), and is supported between the first mounting sleeve (300) and the second mounting sleeve (700).

4. The anti-penetration structure for a sampler as described in claim 3, characterized in that, The trigger (500) is an L-shaped baffle fixed to the upper surface of the first mounting sleeve (300); a portion of the L-shaped baffle extends upward to form a stop for limiting the compression spring, and the L-shaped baffle includes a lateral extension that extends laterally out of the lateral edge of the first mounting sleeve (300); the inductive switch (400) is mounted on a moving path above the lateral extension.

5. The anti-penetration structure for a sampler as described in claim 1, characterized in that, The first mounting sleeve (300) has a mounting inner hole (301) for the sampling rod (100) to pass through. A sampling rod removal and replacement assembly (800) is provided on the side wall of the mounting inner hole (301). The sampling rod removal and replacement assembly (800) includes: The elastic locking structure (810) includes two locking blocks (811) and two second elastic members (812). The two locking blocks (811) are symmetrically arranged on both sides of the mounting inner hole (301). One end of the second elastic member (812) is fixed to the first mounting sleeve (300), and the other end is connected to the locking block (811). The locking block (811) is configured to have a tendency to move away from the sampling rod (100) under the pulling force of the second elastic member (812). The synchronous push structure (820) includes two lead screws (821), each of which is connected to a lead screw nut (822). The two lead screws (821) are rotatably mounted on the first mounting sleeve (300) and located on both sides of the mounting inner hole (301). The lead screw nut (822) and the locking block (811) on the same side are engaged by abutting through inclined surfaces. The sampling rod disassembly and replacement assembly (800) has a first state and a second state: In the first state, the second elastic element (812) pulls the locking block (811) so that it is spaced apart from the sampling rod (100); In the second state, the two lead screws (821) rotate synchronously in the same direction, driving the lead screw nuts (822) on them to move synchronously, and pushing the two locking blocks (811) to move towards each other through the inclined plane, so as to overcome the tension of the second elastic element (812) and lock the sampling rod (100) together.

6. The anti-penetration structure for a sampler as described in claim 5, characterized in that, The lead screw (821) includes a first threaded section (821a) and a second threaded section (821b), the threads of the first threaded section (821a) and the second threaded section (821b) having opposite directions; each lead screw (821) is connected to two lead screw nuts (822), which respectively mate with the first threaded section (821a) and the second threaded section (821b); The two lead screw nuts (822) abut against the two ends of the locking block (811) on the same side through symmetrically arranged inclined surfaces; when the lead screw (821) is rotated, the two lead screw nuts (822) on the same lead screw (821) move synchronously towards or away from each other.

7. The anti-penetration structure for a sampler as described in claim 5, characterized in that, The two lead screws (821) are connected to the drive motor (840) via a transmission structure (830); The transmission structure (830) includes a first transmission gear (831), a second transmission gear (832), a third transmission gear (833), and a synchronous belt (834). The first transmission gear (831) is rotatably fitted on the outer periphery of the first mounting sleeve (300), and its rotation axis coincides with the axis of the mounting inner hole (301). The center of the first transmission gear (831) is provided with a clearance hole with a diameter larger than that of the mounting inner hole (301). The first transmission gear (831) is meshed with the output shaft of the drive motor (840) through a gear pair (841); The second transmission gear (832) and the third transmission gear (833) are coaxially fixedly mounted at the ends of the two lead screws (821); The synchronous belt (834) is sleeved on the first transmission gear (831), the second transmission gear (832), and the third transmission gear (833) so that the drive motor (840) can synchronously drive the second transmission gear (832) and the third transmission gear (833) to rotate through the gear pair (841), the first transmission gear (831), and the synchronous belt (834).

8. The anti-penetration structure for a sampler as described in claim 7, characterized in that, The bottom of the second transmission gear (832) and the third transmission gear (833) are provided with positioning holes, and the first mounting sleeve (300) is provided with a corresponding positioning post; the positioning post cooperates with the positioning hole to realize the radial positioning of the second transmission gear (832) and the third transmission gear (833).

9. The anti-penetration structure for a sampler as described in claim 5, characterized in that, The inclined surface of the locking block (811) and the lead screw nut (822) that abut against each other is an arc-shaped inclined surface.

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