Long-distance accurate fixed-point sampling device

Abstract

The utility model discloses a long-distance accurate fixed-point sampling device which comprises a sampling barrel connected with a coring drill rod. A through channel is formed in the coring drill rod, the sampling barrel is sleeved with the through channel, the outer side wall of the sampling barrel is connected with the inner wall of the through channel through a traction structure, and a ventilation gap is formed between the outer side wall of the sampling barrel and the inner wall of the through channel; the inner wall of one end of the through channel is fixedly connected with a spherical sealing cover through a fixing frame, the outer diameter of the spherical sealing cover is larger than the inner diameter of the sampling barrel, and the spherical sealing cover can control the plugging state of the end of the sampling barrel; a first switch assembly used for controlling the circulation state of the ventilation gap is arranged in the ventilation gap. A second switch assembly for controlling the air inlet state of the sampling barrel is arranged at one end, far away from the spherical sealing cover, of the sampling barrel; and a third switch assembly for controlling the filling state of the sampling barrel is arranged in the sampling barrel.

Description

Technical Field

[0001] This utility model relates to the field of coal mine sampling, and in particular to a long-distance, precise, fixed-point sampling device. Background Technology

[0002] In existing technologies, during coal dust sampling, negative pressure generated by a vacuum pump or gas ejector device is used to move coal dust that falls off the sampling drill bit during drilling into a coal dust collector for collection, thus achieving rapid, targeted sampling. Patent No. ZL202211357827.9 discloses an underground coal dust targeted sampling tool, which achieves coal dust sampling through the cooperation of a power unit, mechanical transmission device, sprocket structure, ratchet mechanism, ventilation structure, and sampling device. However, this coal dust sampling tool is structurally overly complex, resulting in high production costs. Furthermore, its assembly is difficult and inefficient, severely impacting its effectiveness and hindering market promotion. Therefore, improvement is necessary. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a long-distance, precise, fixed-point sampling device that is simple in structure and easy to operate.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A long-distance, precise, fixed-point sampling device includes a sampling cylinder connected to a coring drill rod. A through-channel is provided within the coring drill rod, and the sampling cylinder is fitted within the through-channel. The outer wall of the sampling cylinder is connected to the inner wall of the through-channel via a tension structure, and a ventilation gap is provided between the outer wall of the sampling cylinder and the inner wall of the through-channel. A spherical sealing cap is fixedly connected to the inner wall of one end of the through-channel via a fixing bracket. The outer diameter of the spherical sealing cap is larger than the inner diameter of the sampling cylinder and can control the sealing state of the sampling cylinder end. A first switch assembly for controlling the flow state of the ventilation gap is provided within the ventilation gap. A second switch assembly for controlling the air intake state of the sampling cylinder is provided at the end of the sampling cylinder away from the spherical sealing cap. A third switch assembly for controlling the filling state of the sampling cylinder is provided inside the sampling cylinder.

[0006] Furthermore, the length direction of the through channel is consistent with the axial direction of the coring drill rod, and both ends of the through channel penetrate the axial ends of the coring drill rod; the length direction of the sampling tube is consistent with the length direction of the through channel, and the sampling tube can move along the length direction of the through channel within the through channel.

[0007] Furthermore, the pulling structure is a combination of a pulling rope or a limiting protrusion and a limiting groove, which limits the movement distance of the sampling cylinder within the through channel.

[0008] Furthermore, the first switch assembly includes a plurality of first blocking plates, which are arranged sequentially along the inner circumference of the through channel. One end of the first blocking plate is connected to the inner wall of the through channel by a first spring hinge, and the other end of the first blocking plate is inclined toward the spherical sealing cover and abuts against the outer wall of the sampling cylinder under the elastic action of the first spring hinge, so as to seal the flow state of the ventilation gap.

[0009] Furthermore, the second switch assembly includes several second blocking blades. The sampling tube is a cylindrical shell with one open end, and the open end of the sampling tube faces the spherical sealing cover. A central through hole is provided at the end of the sampling tube away from the spherical sealing cover. The several second blocking blades are arranged sequentially along the inner circumference of the central through hole. One end of the second blocking blade is connected to the edge of the central through hole through a second spring hinge. The other end of the second blocking blade is inclined away from the spherical sealing cover under the elastic action of the second spring hinge.

[0010] Furthermore, the third switch assembly includes several third blocking plates, which are arranged sequentially along the inner circumference of the sampling cylinder. One end of each third blocking plate is connected to the inner wall of the sampling cylinder via a third spring hinge, and the other end of each third blocking plate is inclined toward the spherical sealing cap under the action of the third spring hinge.

[0011] Furthermore, the third switch assembly also includes an air inlet hose, which is fitted inside the sampling cylinder. One end of the air inlet hose is connected to the central through hole, and the interior of the air inlet hose is connected to the through channel through the central through hole. The other end of the air inlet hose passes through the area enclosed by several third blocking plates, and the outer peripheral sidewall of the air inlet hose is connected to the end of the third blocking plate away from the inner wall of the sampling cylinder. When the third blocking plate is closed, the third blocking plate squeezes the sidewall of the air inlet hose to keep the air inlet hose in a closed state.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are:

[0013] In this invention, during coal dust sampling, air is introduced into the core drill rod during drilling. Under the action of air pressure, the second blocking blade at the rear end of the core tube closes and blocks the central through hole on the core tube. The air pressure pushes the core tube forward and makes the front end of the core tube tightly abut against the spherical sealing cap, preventing coal dust generated during drilling from entering the core tube. At the same time, under the action of air pressure, the first blocking blade opens, and the airflow passes through the ventilation gap and exits from the end of the core drill rod to discharge the coal dust in the borehole.

[0014] Upon reaching the target coal seam, the coring drill pipe is ventilated under negative pressure. Under the action of air pressure, the coring cylinder slides towards the rear end, and the front end of the coring cylinder moves away from the spherical sealing cover. At the same time, the first blocking blade abuts against the outer wall of the coring cylinder under the action of air pressure, keeping the ventilation gap closed. The negative pressure airflow and coal dust enter the coring cylinder through the front end of the coring cylinder. The coal dust remains inside the coring cylinder, and the negative pressure airflow exits through the opened second blocking blade. As the amount of coal dust in the coring cylinder gradually increases, the coal dust will squeeze the third blocking blade, causing the third blocking blade to gradually close. When the third blocking blade is closed, the negative pressure airflow cannot pass through the coring cylinder, thus completing the sampling of coal dust by the coring cylinder.

[0015] After sampling is completed, high-pressure positive air is introduced into the core drill rod again, causing the core tube and coal dust to slide together to the front end. Finally, the front end of the core tube is tightly fitted with the spherical sealing cap, and the second blocking blade closes and locks, thus achieving the sealing operation of the coal sample. After the drill is withdrawn, the core tube can be taken out to carry out the coal sample desorption operation.

[0016] This invention enables the sampling operation of the core tube by introducing positive air pressure, negative air pressure, and positive high pressure into the core drill rod. The entire structure only requires the installation of multiple blocking blades and a spherical sealing cap between the core drill rod and the core tube. Its simple structure effectively reduces the production cost of the coal dust sampling device. At the same time, it has no assembly difficulty and has extremely high assembly efficiency, which effectively improves the use effect of the coal dust sampling device and has excellent market promotion prospects. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a diagram showing the working state of this utility model before sampling;

[0019] Figure 2 for Figure 1 A magnified view of the local structure;

[0020] Figure 3 This is a diagram showing the working state during the sampling process of this utility model;

[0021] Figure 4 This is a diagram showing the working state of this utility model after sampling. Detailed Implementation

[0022] 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, any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art to all other embodiments obtained without creative effort should be included within the protection scope of the present utility model.

[0023] like Figures 1 to 4 As shown, this embodiment discloses a long-distance precise fixed-point sampling device, including a sampling cylinder 4, which is connected to the core drill rod 1;

[0024] The core drill rod 1 is provided with a through channel 101. The length direction of the through channel 101 is consistent with the axial direction of the core drill rod 1, and both ends of the through channel 101 pass through the axial ends of the core drill rod 1. When the drill bit is installed at the front end of the core drill rod 1, the drill bit is also provided with an airflow channel to communicate with the through channel 101 inside the core drill rod, so as to realize the ventilation operation of the core drill rod 1.

[0025] The sampling cylinder 4 is fitted inside the through channel 101. The length direction of the sampling cylinder 4 is consistent with the length direction of the through channel 101, and the sampling cylinder 4 can move along the length direction of the through channel 101 within the through channel 101. The outer wall of the sampling cylinder 4 is connected to the inner wall of the through channel 101 by a tension structure, and a ventilation gap 102 is provided between the outer wall of the sampling cylinder 4 and the inner wall of the through channel 101.

[0026] The pulling structure is as follows: multiple limiting protrusions 103 are provided on the inner wall of the core drill rod 1 along the circumferential direction of the through channel 101, and multiple limiting long grooves 401 corresponding to the limiting protrusions 103 are provided on the outer wall of the sampling cylinder 4. The length direction of the limiting long grooves 401 is consistent with the length direction of the sampling cylinder 4, and the limiting protrusions 103 are located in the limiting long grooves 401. When the sampling cylinder 4 slides in the through channel 101, the limiting protrusions 103 slide in the limiting long grooves 401. When the sampling cylinder 4 slides to the left, the sampling cylinder 4 and the spherical sealing cover 3 are in an open state. When the sampling cylinder 4 slides to the right, the sampling cylinder 4 and the spherical sealing cover 3 are in a closed state.

[0027] The main purpose of this traction structure is to limit the movement distance of the sampling tube within the through channel. The positions of its limiting protrusion and limiting groove can be reversed, or a traction rope can be connected between the inner wall of the core drill rod and the outer wall of the core tube to limit its range of motion. It also has the same technical effect as the technical solution in this invention.

[0028] A spherical sealing cap 3 is fixedly connected to the inner wall of one end of the through channel 101 by a fixing bracket 2. The spherical sealing cap 3 is a rubber ball or other spherical structure with sealing effect. The outer diameter of the spherical sealing cap 3 is larger than the inner diameter of the sampling cylinder 4 and can control the sealing state of the end of the sampling cylinder 4. A first switch assembly for controlling the flow state of the ventilation gap 102 is provided in the ventilation gap 102.

[0029] The first switch assembly includes a plurality of first blocking plates 5, which are arranged sequentially along the inner circumferential direction of the through channel 101. One end of the first blocking plate 5 is connected to the inner wall of the through channel 101 by a first spring hinge, and the other end of the first blocking plate 5 is inclined toward the spherical sealing cover 3 and abuts against the outer wall of the sampling cylinder 4 under the elastic action of the first spring hinge, so as to seal the flow state of the ventilation gap 102.

[0030] Several first blocking blades form a ring structure after closing, which blocks the ventilation gap through the ring structure; a single first blocking blade is part of the ring structure and can be an arc-shaped structure; of course, its specific shape can be set according to the cross-sectional shape of the ventilation gap. For example, if the cross-sectional shape of the ventilation gap is a rectangular ring, then a rectangular plate-shaped first blocking blade needs to be designed to block it.

[0031] The first baffle plate is in the open state when the core drill rod is ventilated in the forward direction and in the closed state when it is ventilated in the negative pressure direction; the elastic force of the first spring hinge is less than the wind pressure force when ventilating in the forward direction; the function of the first spring hinge is to keep the first baffle plate in an inclined state, and it will make corresponding actions under the action of wind pressure during forward or negative ventilation to control the flow state of the ventilation gap.

[0032] In the design, as long as the first blocking plate can achieve the technical effect of being open when the core drill rod is ventilated in the forward direction and closed when it is ventilated in the negative pressure direction, its connection structure can be modified according to the requirements. For example, one end of the first blocking plate can be connected to the outer wall of the core cylinder through the first spring hinge, and the other end can be tilted towards the spherical sealing cover and abut against the inner wall of the through channel. This can also achieve the technical effect in this technical solution and is also within the protection scope of this technical solution.

[0033] The sampling cylinder 4 is a cylindrical shell with one end open, and the open end of the sampling cylinder 4 faces the spherical sealing cover 3; a central through hole 402 is provided at the end of the sampling cylinder 4 away from the spherical sealing cover 3; a second switch assembly for controlling the air intake state of the sampling cylinder 4 is provided on the outside of the central through hole 402.

[0034] The second switch assembly includes a plurality of second blocking blades 6, which are arranged sequentially along the inner circumference of the central through hole 402. One end of the second blocking blade 6 is connected to the edge of the central through hole 402 by a second spring hinge, and the other end of the second blocking blade 6 is inclined away from the spherical sealing cover 3 under the elastic action of the second spring hinge.

[0035] Several second blocking plates form a circular plate structure after being closed, which blocks the central through hole. A single second blocking blade is part of the circular plate structure, which can be a fan-shaped plate structure or a semi-circular plate structure. Of course, its specific shape can be set according to the cross-sectional shape of the central through hole. For example, if the cross-sectional shape of the central through hole is rectangular, then a rectangular plate-shaped second blocking blade needs to be designed to block it.

[0036] The second baffle plate is closed when the core drill rod is ventilated in the forward direction and open when it is ventilated in the negative pressure direction. The function of the second spring hinge is to keep the second baffle plate in an inclined state. When ventilating in the forward or negative direction, it will make corresponding movements under the action of wind pressure to control the flow state of the central through hole.

[0037] The sampling cylinder 4 is equipped with a third switch assembly for controlling the filling state of the sampling cylinder 4.

[0038] The third switch assembly includes several third blocking plates 7 and an air inlet hose 8. The several third blocking plates 7 are arranged sequentially along the inner circumference of the sampling cylinder 4. One end of the third blocking plate 7 is connected to the inner wall of the sampling cylinder 4 through a third spring hinge, and the other end of the third blocking plate 7 is inclined towards the spherical sealing cover 3 under the action of the third spring hinge. The air inlet hose 8 is sleeved inside the sampling cylinder 4. One end of the air inlet hose 8 is connected to the central through hole 402, and the interior of the air inlet hose 8 is connected to the through channel 101 through the central through hole 402. The other end of the air inlet hose 8 passes through the enclosed area of ​​the several third blocking plates 7, and the outer circumferential sidewall of the air inlet hose 8 is connected to the end of the third blocking plate 7 away from the inner wall of the sampling cylinder 4. When the third blocking plate 7 is closed, the third blocking plate 7 squeezes the sidewall of the air inlet hose 8 to keep the air inlet hose 8 in a closed state.

[0039] Several third blocking blades form a circular plate structure after closing, which seals the inside of the core-taking cylinder. A single third blocking blade is part of the circular plate structure and can be a semi-circular plate structure. Of course, its specific shape can be set according to the cross-sectional shape inside the core-taking cylinder. For example, if the cross-sectional shape inside the core-taking cylinder is rectangular, then a rectangular plate-shaped third blocking blade needs to be designed to block it.

[0040] The elastic force of the third spring hinge is greater than the wind pressure of the negative ventilation to prevent the third blocking blade from closing directly when negative pressure wind is introduced into the through channel, thus preventing the collection of coal dust. The function of the second spring hinge is to keep the third blocking blade in an inclined state. When the coal dust enters the core tube and squeezes the third blocking blade, it will close under the squeezing action, keeping the core tube in a closed state.

[0041] The design of the air inlet hose is mainly to accelerate the accumulation rate of coal dust during the sampling process and reduce the outflow of coal dust; to allow the accumulated coal dust to exert a squeezing force on the third baffle plate as soon as possible; in the design, the third baffle plate can also be directly set inside the core tube without designing an additional air inlet hose. Such a change will reduce the coal dust accumulation rate and affect the sampling rate of the core tube, but it still has the technical effect of this technical solution.

[0042] During the drilling process of the core drill rod 1, air is introduced into the core drill rod 1 in the forward direction. Under the action of air pressure, the second blocking blade 6 at the rear end of the core cylinder 4 closes and blocks the central through hole 402 on the core cylinder 4. The air pressure pushes the core cylinder 4 to move towards the front end and makes the front end of the core cylinder 4 tightly abut against the spherical sealing cap 3, preventing the coal slag generated during the drilling process from entering the core cylinder 4. At the same time, under the action of air pressure, the first blocking blade 5 opens, and the airflow passes through the ventilation gap 102 and exits from the end of the core drill rod 1 to discharge the coal slag in the borehole. Figure 1 , Figure 2 As shown;

[0043] After reaching the target coal seam, negative pressure ventilation is applied inside the core drill rod 1. Under the action of air pressure, the core cylinder 4 slides towards the rear end, and the front end of the core cylinder 4 leaves the spherical sealing cover 3, leaving the front end of the core cylinder 4 in an open state. Simultaneously, the first blocking blade 5 abuts against the outer wall of the core cylinder 4 under the action of air pressure, closing the ventilation gap 102. The negative pressure airflow and coal dust 9 enter the core cylinder 4 through the front end, where the coal dust 9 remains. The negative pressure airflow exits through the open second blocking blade 6. As the amount of coal dust 9 in the core cylinder 4 gradually increases, it compresses the third blocking blade 7, causing it to gradually close. When the third blocking blade 7 is completely closed, the negative pressure airflow cannot pass through the core cylinder 4, completing the sampling of coal dust 9 by the core cylinder 4. Figure 3 As shown;

[0044] After sampling, high-pressure positive airflow is again introduced into the core drill rod 1, causing the core tube 4 and coal dust 9 to slide together towards the front end. This results in the front end of the core tube 4 being tightly fitted into the spherical sealing cap 3, while simultaneously causing the second blocking blade 6 to close and lock, thus achieving coal sample sealing. After retracting the drill, the core tube 4 can be removed for coal sample desorption. Figure 4 As shown;

[0045] This invention enables the sampling operation of the core tube by introducing positive air pressure, negative air pressure, and positive high pressure into the core drill rod. The entire structure only requires the installation of multiple blocking blades and a spherical sealing cap between the core drill rod and the core tube. Its simple structure effectively reduces the production cost of the coal dust sampling device. At the same time, it has no assembly difficulty and has extremely high assembly efficiency, which effectively improves the use effect of the coal dust sampling device and has excellent market promotion prospects.

Claims

1. A long-distance, precise, fixed-point sampling device, comprising a sampling tube connected to a core drill rod; characterized in that: The core drill rod has a through channel, and the sampling cylinder is fitted inside the through channel. The outer wall of the sampling cylinder is connected to the inner wall of the through channel by a tension structure, and a ventilation gap is provided between the outer wall of the sampling cylinder and the inner wall of the through channel. A spherical sealing cap is fixedly connected to the inner wall of one end of the through channel by a fixing bracket. The outer diameter of the spherical sealing cap is larger than the inner diameter of the sampling cylinder and can control the sealing state of the sampling cylinder end. A first switch assembly for controlling the flow state of the ventilation gap is provided in the ventilation gap. A second switch assembly for controlling the air intake state of the sampling cylinder is provided at the end of the sampling cylinder away from the spherical sealing cap. A third switch assembly for controlling the filling state of the sampling cylinder is provided inside the sampling cylinder.

2. The long-distance precise fixed-point sampling device as described in claim 1, characterized in that: The length direction of the through channel is consistent with the axial direction of the coring drill rod, and both ends of the through channel pass through the axial ends of the coring drill rod; the length direction of the sampling tube is consistent with the length direction of the through channel, and the sampling tube can move along the length direction of the through channel within the through channel.

3. The long-distance precise fixed-point sampling device as described in claim 2, characterized in that: The pulling structure is a combination of a pulling rope or a limiting protrusion and a limiting groove, which limits the movement distance of the sampling cylinder in the through channel.

4. The long-distance precise fixed-point sampling device as described in claim 3, characterized in that: The first switch assembly includes a plurality of first blocking plates, which are arranged sequentially along the inner circumference of the through channel. One end of the first blocking plate is connected to the inner wall of the through channel by a first spring hinge, and the other end of the first blocking plate is inclined toward the spherical sealing cover and abuts against the outer wall of the sampling cylinder under the elastic action of the first spring hinge, so as to seal the flow state of the ventilation gap.

5. The long-distance precise fixed-point sampling device as described in claim 4, characterized in that: The second switch assembly includes several second blocking blades. The sampling tube is a cylindrical shell with one open end, and the open end of the sampling tube faces the spherical sealing cover. A central through hole is provided at the end of the sampling tube away from the spherical sealing cover. The several second blocking blades are arranged sequentially along the inner circumference of the central through hole. One end of the second blocking blade is connected to the edge of the central through hole through a second spring hinge. The other end of the second blocking blade is inclined away from the spherical sealing cover under the elastic action of the second spring hinge.

6. The long-distance precise fixed-point sampling device as described in claim 5, characterized in that: The third switch assembly includes several third blocking plates, which are arranged sequentially along the inner circumference of the sampling cylinder. One end of each third blocking plate is connected to the inner wall of the sampling cylinder via a third spring hinge, and the other end of each third blocking plate is inclined toward the spherical sealing cap under the action of the third spring hinge.

7. The long-distance precise fixed-point sampling device as described in claim 6, characterized in that: The third switch assembly also includes an air inlet hose, which is fitted inside the sampling cylinder. One end of the air inlet hose is connected to the central through hole, and the interior of the air inlet hose is connected to the through channel through the central through hole. The other end of the air inlet hose passes through the area enclosed by several third baffles, and the outer peripheral sidewall of the air inlet hose is connected to the end of the third baffle that is away from the inner wall of the sampling cylinder. When the third baffles are closed, the third baffles squeeze the sidewall of the air inlet hose to keep the air inlet hose in a closed state.

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