A sample extraction device for soil remediation

Abstract

The utility model discloses a sample extraction device for soil remediation, which comprises a drilling rod, a feeding mechanism and a plurality of inner lining sampling cylinders, the feeding mechanism is arranged in the drilling rod, a sampling window is formed in the barrel wall of the drilling rod, a guide cylinder is arranged at the sampling window, and the inner lining sampling cylinders are arranged in the guide cylinder, the feeding mechanism comprises a driving rod and an arc-shaped connecting rod. After single drilling to the target depth, the drilling rod does not need to be pulled out, the inner lining sampling cylinders can be pushed out and sampling can be carried out through the built-in feeding mechanism, the continuous and in-situ collection of different depth soils in single drilling is realized, the operation efficiency is improved, the operation strength is reduced, the sample is directly packaged in the disposable inner lining sampling cylinder, the cross contamination between different depths and different point positions is eliminated, and the originality of the sample and the authenticity and reliability of the detection data are ensured.

Description

Technical Field

[0001] This utility model relates to the field of soil sampling technology, and in particular to a sample extraction device for soil remediation. Background Technology

[0002] Currently, most mainstream soil sample extraction devices are semi-mechanical samplers, whose structure typically includes a power source, a drill rod, and a sampling drill bit. During operation, the drill rod is driven by power to rotate and drill into the ground. After reaching the predetermined depth, the entire drill rod must be pulled out to retrieve the sample.

[0003] However, this device has significant technical drawbacks when performing multi-depth profile sampling. When samples need to be collected from different depths within the same borehole, operators must perform a tedious, cyclical operation: drill to the first depth, completely pull out the drill rod to retrieve the sample; then put the drill rod back into the hole, drill to the second depth, and pull it out again. This process is repeated, with each additional sampling depth representing a complete "drill-pull" cycle. This operational mode directly leads to reduced work efficiency, especially in deep sampling or hard soil conditions, where the manual pulling of the drill rod is extremely labor-intensive, severely hindering the progress of large-scale soil surveys. Furthermore, repeated drilling disturbs the upper soil layers, easily causing cross-contamination of samples and affecting the accuracy of the test data. Summary of the Invention

[0004] In view of this, the present invention provides a soil remediation sample extraction device to solve the technical problems of inefficiency and inconvenience in stratified sampling of existing devices. To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or to describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simple form as a prelude to the detailed description that follows.

[0005] The present invention adopts the following technical solution: A soil remediation sample extraction device is provided, comprising: a drill rod, a feeding mechanism, and a plurality of inner-lined sampling cylinders, wherein the feeding mechanism is disposed within the drill rod; the drill rod is a hollow cylindrical structure, a sampling window is provided on the cylinder wall of the drill rod, a guide cylinder is provided at the sampling window, and the inner-lined sampling cylinders are disposed within the guide cylinders; the feeding mechanism comprises: a drive rod and an arc-shaped connecting rod, a channel is provided on the drive rod, the arc-shaped connecting rod passes through the channel, and the end of the arc-shaped connecting rod is hinged to the inner-lined sampling cylinders.

[0006] Furthermore, the outer opening of the guide tube is located within the sampling window, the inner opening of the guide tube faces the interior of the drill rod, and the guide tube is inclined so that the position of the inner opening of the guide tube is higher than the position of the outer opening of the guide tube.

[0007] Furthermore, the guide cylinder is divided into two groups, and the two groups of guide cylinders are symmetrically arranged on the cylinder wall of the drill rod, with each guide cylinder in each group being evenly spaced.

[0008] Furthermore, the inner lining sampling cylinder includes: an outer sampling cylinder, an inner sampling cylinder, and a piston. The outer sampling cylinder is disposed inside the guide cylinder, and a sampling channel is formed on the outer sampling cylinder. The inner sampling cylinder is disposed inside the outer sampling cylinder, and the piston is disposed inside the inner sampling cylinder. A first slot is formed at the outer end of the outer sampling cylinder, and a second slot is formed at the outer end of the inner sampling cylinder. The inner end of the outer sampling cylinder is hinged to the end of the arc-shaped connecting rod.

[0009] Furthermore, the rod of the arc-shaped connecting rod bends upward.

[0010] Furthermore, the drill rod includes an outer drill rod and an inner drill rod, the inner drill rod being disposed inside the outer drill rod, the sampling window being opened on the cylinder wall of the inner drill rod, and a clearance groove being opened on the outer drill rod, the upper and lower sides of the clearance groove being inclined groove walls.

[0011] Furthermore, the soil remediation sample extraction device further includes: a power mechanism, a guiding mechanism, and a support frame. The power mechanism is mounted on the support frame via the guiding mechanism. The power mechanism includes: an adjustable speed motor, a gear reducer, and a ball screw feed mechanism. The power output end of the adjustable speed motor is connected to the gear reducer, and the power output end of the gear reducer is connected to the drill rod. The adjustable speed motor is connected to the lead screw of the ball screw feed mechanism via a synchronous belt.

[0012] The beneficial effects of this utility model are as follows: After drilling to the target depth in a single operation, the inner lining sampling tube can be pushed out and sampled through the built-in feeding mechanism without pulling out the drill rod. This enables continuous, in-situ collection of soil at different depths within a single borehole, which not only improves work efficiency and reduces operational intensity, but also eliminates cross-contamination between different depths and locations because the sample is directly sealed in a disposable inner lining sampling tube, ensuring the originality of the sample and the authenticity and reliability of the test data. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the external structure of a soil remediation sample extraction device according to the present invention; Figure 2 This is a schematic diagram showing the connection of the drill rod, feed mechanism, and inner sampling cylinder of this utility model; Figure 3 This is a schematic diagram of the structure of the sampling cylinder with inner lining of this utility model. Detailed Implementation

[0015] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0016] like Figure 1-3 As shown in some illustrative embodiments, a soil remediation sample extraction device is provided, including: a drill rod 100, a power mechanism 200, a guiding mechanism 300, a support frame 400, a feeding mechanism 500, and a plurality of lined sampling cylinders 600.

[0017] The guide mechanism 300 is a linear guide rail, and the bearing component of the linear guide rail is installed on the support frame 400. The power mechanism 200 is set on the support frame 400 through the guide mechanism 300, that is, the power mechanism 200 is installed on the moving part of the linear guide rail so that the power mechanism 200 can move along the laying direction of the linear guide rail.

[0018] The power mechanism 200 includes: an adjustable speed motor 210, a gear reducer 220, and a ball screw feed mechanism.

[0019] The power output end of the adjustable speed motor 210 is connected to the gear reducer 220, and the power output end of the gear reducer 220 is connected to the drill rod 100. Specifically, the adjustable speed motor 210 is coaxially rigidly connected to the input end of the gear reducer 220 through a high-strength flange. The power output spindle of the gear reducer 220 is hollow and has a keyway or spline inside. The lower end of the power output spindle is connected to the drill rod 100 through a rotary joint.

[0020] The adjustable speed motor 210 is connected to the lead screw 230 of the ball screw feed mechanism via a synchronous belt, and the nut 240 of the ball screw feed mechanism is fixedly connected to the support frame 400. When the operator starts the adjustable speed motor 210, the motor begins to rotate, and its power output shaft splits the power into two via the synchronous belt: one path is directly transmitted to the lead screw 230 of the ball screw feed mechanism, and the other path is transmitted to the input end of the gear reducer 220.

[0021] After power enters the gear reducer 220, it is reduced in speed and increased in torque before being output from its hollow power output spindle. This power is then transmitted to the drill rod 100 via a rotary joint, causing the drill rod 100 to rotate and providing torque for cutting the soil. Simultaneously, another power source drives the ball screw feed mechanism's lead screw 230 to rotate. Since the nut 240 of this mechanism is fixedly connected to the support frame 400, it cannot rotate or move. Therefore, when the lead screw 230 rotates, it generates axial linear motion. Because the lead screw 230 and the entire power mechanism 200 form a rigid whole, the axial linear motion of the lead screw 230 drives the entire power mechanism 200 to move smoothly vertically along the linear guide rail mounted on the support frame 400.

[0022] Throughout the drilling process, the drill rod 100 continuously rotates under the drive of the gear reducer 220, while the entire power mechanism 200 carrying it is fed downwards in a straight line along the guide mechanism 300 under the drive of the ball screw feed mechanism. These two movements are synchronized and do not interfere with each other, thus enabling the drill rod 100 to smoothly and automatically drill into the soil while rotating until the predetermined depth is reached.

[0023] The drill rod 100 is a hollow cylindrical structure, comprising an outer drill rod 110 and an inner drill rod 120. The drill rod 100 adopts a double-layer coaxial hollow cylindrical structure, with its body consisting of an outer drill rod 110 for cutting and a coaxial inner drill rod 120 serving as an internal functional platform. A sampling window 121 is provided on the cylindrical wall of the drill rod 100, specifically on the inner drill rod 120 at a preset sampling depth. A guide cylinder 130 is provided at the sampling window 121, and an inner sampling cylinder 600 is disposed within the guide cylinder 130. The inner sampling cylinder 600 can move along the guide cylinder 130 under the drive of the feed mechanism 500. Therefore, the sampling window 121 is the only channel for the inner sampling cylinder 600 to enter and exit the drill rod 100.

[0024] The feed mechanism 500 is located within the drill rod 100, specifically inside the inner drill rod 120. The feed mechanism 500 includes a drive rod 510 and an arc-shaped connecting rod 520. The drive rod 510 is a rod-shaped structure that can move axially (up and down). Channels 530 are formed on the drive rod 510 at positions corresponding to various sampling depths. The arc-shaped connecting rod 520 passes through the channels 530, and its end is hinged to the inner sampling cylinder 600. The arc-shaped connecting rod 520 bends upwards, exhibiting a certain degree of elasticity.

[0025] Working process: The device drills under the drive of the power mechanism 200. At this time, the drive rod 510 is in the initial high position, the arc-shaped connecting rod 520 is in a natural bent and relaxed state, and all the inner lining sampling cylinders 600 are completely retracted inside the drill rod 100. When the drill rod 100 reaches the target sampling depth, drilling is paused, and the drive rod 510 is pushed down by an external control device (cylinder or hydraulic cylinder). As the drive rod 510 moves down, the upper edge of the channel 530 on it gradually contacts and presses down on the bending apex of the arc-shaped connecting rod 520. The arc-shaped connecting rod 520 is under pressure and tends to change from a bent state to a straight state. Since the length of the arc-shaped connecting rod 520 remains basically unchanged, this tendency is converted into an expansion force to both sides, thereby simultaneously pushing the two inner lining sampling cylinders 600 hinged at both ends, pushing them out along the guide cylinder 130 and inserting them into the undisturbed soil on the borehole sidewall. After the sample is filled, pull the drive rod 510 upwards. The pressure on the upper edge of the channel 530 disappears. Under the action of its own elasticity and the rebound force of the soil, the arc-shaped connecting rod 520 returns to its original bent state. During this process, the arc-shaped connecting rod 520 pulls the inner lining sampling cylinder 600 out of the soil and pulls it back into the drill rod 100.

[0026] Eliminating the need for repeated rod pulling and drilling at each depth improves sampling efficiency, making it particularly suitable for soil remediation projects requiring detailed profile analysis. Furthermore, each inner-lined sampling tube 600 operates independently, completing sampling and retrieval within the drill rod, completely isolating it from the outside environment and other soil layers, fundamentally eliminating cross-contamination. In addition, utilizing the straightening effect of the arc-shaped connecting rod 520, the vertical axial force is converted into horizontal thrust. The structure is simple, provides strong thrust, and is structurally stable. The feed mechanism 500 is completely integrated into the drill rod, without increasing external volume, resulting in a compact and robust overall device.

[0027] The outer opening of the guide cylinder 130 is located inside the sampling window 121. The outer opening of the guide cylinder 130 refers to the end closest to the soil, flush with or slightly recessed from the edge of the sampling window 121 on the inner drill rod 120, ensuring smooth delivery of the inner lining sampling cylinder 600 out of the drill rod without affecting the normal rotation of the drill rod. The inner opening of the guide cylinder 130 faces the inside of the drill rod 100, and the guide cylinder 130 is inclined so that, vertically, the position of the inner opening of the guide cylinder 130 is higher than the position of the outer opening. This inclined arrangement ensures that when the inner lining sampling cylinder 600 is pushed out, its trajectory is a downward-sloping straight line, rather than a horizontal insertion into the soil, cutting into the soil layer of the sidewall at a slight downward angle. When the inner liner sampling cylinder 600 is pushed outward, the downward tilt angle gives its front end a certain downward tendency, which helps the inner liner sampling cylinder 600 to cut into relatively hard or blocky soil more easily and stably, reducing the possibility of deviation or warping due to resistance.

[0028] The guide cylinders 130 are divided into two groups, symmetrically arranged on the wall of the drill rod 100, with each group's guide cylinders 130 spaced evenly apart. For example, if five samples are planned to be taken at a depth of 0-1 meter, the five guide cylinders in each group will be located at depths of 0.2m, 0.4m, 0.6m, 0.8m, and 1.0m, respectively. Therefore, the two groups of guide cylinders 130 will appear in pairs at the same depth. When the drive rod 510 of the feed mechanism 500 moves downward, at each preset sampling depth, two identical inner-lined sampling cylinders 600 will be simultaneously and symmetrically pushed out from both sides of the drill rod and inserted into the soil at the same depth. In a single operation, a single downward press of the drive rod 510 can simultaneously acquire two samples at the same depth, doubling the sampling efficiency compared to single-sided sampling. Moreover, the symmetrical arrangement, with the two sets of guide cylinders 130 being pushed out from opposite directions at the same time, ensures that the drill rod 100 maintains good mechanical balance during sampling, making the structure more stable.

[0029] The inner sampling cylinder 600 includes: an outer sampling cylinder 610, an inner sampling cylinder 620, and a piston 630.

[0030] An outer sampling cylinder 610 is disposed inside a guide cylinder 130. An axially oriented sampling channel 611 is formed on the wall of the outer sampling cylinder 610. An inner sampling cylinder 620 is disposed inside the outer sampling cylinder 610. The inner sampling cylinder 620 serves as a temporary storage and transport container for the sample. It is placed into the outer sampling cylinder 610 via the sampling channel 611, facilitating easy placement and removal. The inner end of the outer sampling cylinder 610 is hinged to the end of the arc-shaped connecting rod 520.

[0031] The outer sampling tube 610 has a first slot 612 at its outer end, and the inner sampling tube 620 has a second slot 621 at its outer end. After the sampling channel 611 is placed into the outer sampling tube 610, the first slot 612 and the second slot 621 are aligned to form a complete sample inlet, which facilitates soil entry.

[0032] Piston 630 is disposed inside inner sampling cylinder 620. Appropriate friction exists between piston 630 and the inner wall of inner sampling cylinder 620. When not sampling, piston 630 is positioned at the foremost end of inner sampling cylinder 620, i.e., close to the inner side of second slot 621. Its function is to seal second slot 621, preventing mud, water, or debris from entering the interior during drilling. The entering soil continuously pushes piston 630, originally located at the opening, causing it to overcome the friction with the inner wall of inner sampling cylinder 620 and slide inward (towards the center of the drill pipe).

[0033] On the cylinder wall of the outer drill rod 110, several clearance slots 111 are formed along the axial direction. The upper and lower walls of the clearance slots 111 are inclined. During drilling, the inner drill rod 120 and the outer drill rod 110 maintain a specific relative position, so that all internal structures such as the sampling window 121 and the guide cylinder 130 on the inner drill rod 120 are covered by the solid cylinder wall of the outer drill rod 110. At this time, the outer drill rod 110 forms a closed cylinder, which can effectively cut the soil while protecting the internal sampling mechanism from impact and wear. When drilling reaches the target depth and sampling is required, an external control mechanism (such as a hydraulic cylinder or motor) causes the inner drill rod 120 to move axially relative to the outer drill rod 110, so that the sampling window 121 on the inner drill rod 120 is aligned with the clearance slot 111 on the outer drill rod 110. At this time, the sampling window 121 is exposed through the clearance slot 111, providing a channel for the ejection of the inner lining sampling cylinder 600.

[0034] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A sample extraction device for soil remediation, characterized in that, include: The system comprises a drill rod, a feed mechanism, and several inner lining sampling cylinders. The feed mechanism is disposed within the drill rod. The drill rod is a hollow cylindrical structure with a sampling window on its wall. A guide cylinder is disposed at the sampling window, and the inner lining sampling cylinders are disposed within the guide cylinder. The feed mechanism includes a drive rod and an arc-shaped connecting rod. A channel is provided on the drive rod, and the arc-shaped connecting rod passes through the channel, with its end hinged to the inner lining sampling cylinders.

2. The soil remediation sample extraction device according to claim 1, characterized in that, The outer opening of the guide tube is located inside the sampling window, and the inner opening of the guide tube faces the inside of the drill rod. The guide tube is inclined so that the position of the inner opening of the guide tube is higher than the position of the outer opening of the guide tube.

3. The soil remediation sample extraction device according to claim 2, characterized in that, The guide cylinders are divided into two groups, and the two groups of guide cylinders are symmetrically arranged on the cylinder wall of the drill rod. The guide cylinders in each group are evenly spaced.

4. The soil remediation sample extraction device according to claim 3, characterized in that, The inner sampling cylinder includes an outer sampling cylinder, an inner sampling cylinder, and a piston. The outer sampling cylinder is disposed inside the guide cylinder, and a sampling channel is formed on the outer sampling cylinder. The inner sampling cylinder is disposed inside the outer sampling cylinder, and the piston is disposed inside the inner sampling cylinder. A first slot is formed at the outer end of the outer sampling cylinder, and a second slot is formed at the outer end of the inner sampling cylinder. The inner end of the outer sampling cylinder is hinged to the end of the arc-shaped connecting rod.

5. A soil remediation sample extraction device according to claim 4, characterized in that, The arc-shaped connecting rod bends upwards.

6. A soil remediation sample extraction device according to claim 5, characterized in that, The drill rod includes an outer drill rod and an inner drill rod. The inner drill rod is disposed inside the outer drill rod. The sampling window is opened on the cylinder wall of the inner drill rod. A clearance groove is opened on the outer drill rod. The upper and lower sides of the clearance groove are inclined groove walls.

7. A soil remediation sample extraction device according to claim 6, characterized in that, Also includes: The system includes a power mechanism, a guide mechanism, and a support frame, wherein the power mechanism is mounted on the support frame via the guide mechanism. The power mechanism includes: an adjustable speed motor, a gear reducer, and a ball screw feed mechanism. The power output end of the adjustable speed motor is connected to the gear reducer, and the power output end of the gear reducer is connected to the drill rod. The adjustable speed motor is connected to the lead screw of the ball screw feed mechanism via a synchronous belt.

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