A pressure maintaining sampling device based on a pneumatic motor control

Abstract

The utility model relates to the technical field of coal mining, and disclose a kind of pressure maintaining sampling device based on pneumatic motor control, including drill rod, outer frame, storage tank, pneumatic motor, the drill rod is located in the inside of outer frame, and one end of outer frame is fixedly connected with drill rod by bolt, drill rod is coaxially arranged with outer frame, and the other end of drill rod is fixedly installed with drill bit, and the other end of outer frame is provided with the hollow drill of taper, and there is gap between hollow drill and drill bit.The pressure maintaining sampling device based on pneumatic motor control, the storage component of setting can store the gas of sampling, the cooperation of check valve one and check valve two, effectively reduce gas leakage risk, and the pressure of the gas taken is stably maintained, and in the storage process, gas can be filtered by filter plate, remove impurities, improve the purity of gas sample, and the deformation force of spring is used to assist the pressure inside cavity, guarantee the stability of sampling process.

Description

Technical Field

[0001] This utility model relates to the field of coal mining technology, specifically to a pressure-holding sampling device based on pneumatic motor control. Background Technology

[0002] In the field of coal mining, gas (mainly composed of methane) is an important energy resource, but also a major hidden danger in coal mine safety production. Accurately grasping parameters such as coal seam gas content and pressure is of vital importance for coal mine mining design, gas extraction and utilization, and the formulation of safety protection measures. Therefore, obtaining coal seam gas samples efficiently, accurately, and safely is a key link in coal mine production and research.

[0003] Typically, when sampling gas, a drilling rig is first used to drill to a predetermined depth, and then a sampler is used for coal core drilling. A sampler generally consists of a core tube and a matching sampling drill bit. However, most samplers currently in use are open-type designs. This design has significant drawbacks, making it difficult to meet the pressure-maintaining sampling requirements: the core tube must be kept sealed before sampling, it must be easily opened during sampling, and it must be sealed again after sampling. During the process of sending the open-type sampler into the borehole, before reaching the bottom for sampling, broken coal and rock cuttings from the borehole can easily enter the core tube. This results in the sample being mixed with a large amount of borehole backflow. Furthermore, during the retraction process, because the sampler cannot be sealed, the coal sample is directly exposed to the external environment, causing the gas released from the coal sample to escape. The amount of gas lost is difficult to accurately measure, thus seriously affecting the accuracy of the coal sample gas content determination. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a pressure-holding sampling device based on pneumatic motor control, which has advantages such as pressure-holding sampling and improved sample purity, thus solving the problems mentioned in the background technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pressure-holding sampling device based on pneumatic motor control, comprising a drill rod, an outer frame, a storage tank, and a pneumatic motor. The drill rod is located inside the outer frame. One end of the outer frame is fixedly connected to the drill rod by bolts. The drill rod and the outer frame are coaxially arranged. A drill bit is fixedly installed at the other end of the drill rod. A conical hollow drill is provided at the other end of the outer frame. There is a gap between the hollow drill and the drill bit.

[0006] A storage assembly is installed between the drill pipe and the storage tank;

[0007] The outer frame is equipped with dustproof components.

[0008] Furthermore, the storage assembly includes a cavity opened at one end of the drill pipe near the storage tank. Two symmetrically arranged one-way valves are installed on the inner wall of the cavity. The air inlet ends of the two one-way valves are both located inside the outer frame. A one-way valve is installed in the central area of ​​the inner wall of the storage tank. A discharge valve is fixedly installed on the outer circumferential surface of the storage tank.

[0009] By implementing the above scheme, one-way valve one and one-way valve two can control the unidirectional flow of gas, prevent gas backflow, and ensure that gas can accurately enter the storage tank and maintain stable pressure during the sampling process.

[0010] Furthermore, the storage assembly also includes a sliding ring that is slidably connected to the inner wall of the cavity. A filter plate is installed on the inner wall of the sliding ring, and a spring is fixedly connected to the side of the sliding ring. The other end of the spring is fixedly connected to the inner wall of the cavity.

[0011] The above scheme uses a filter plate to filter the gas entering the storage tank, removing impurities and improving the purity of the gas sample. This prevents impurities from interfering with subsequent analysis. The spring, through its deformation force, causes the sliding ring to move accordingly when the gas pressure changes, assisting in adjusting the internal pressure of the cavity and ensuring the stability of the sampling process.

[0012] Furthermore, a plurality of circumferentially distributed slide rails are fixedly connected to the outer circumferential surface of one end of the drill rod, and one end of the storage tank is slidably sleeved with the drill rod along the plurality of slide rails. A sealing ring is provided between the storage tank and the drill rod, and the drill rod and the storage tank are on the same axis.

[0013] The above scheme, which sets up a sliding connection between the slide rail and the storage tank, allows the drill rod to rotate synchronously with the storage tank during rotation, facilitating drilling and sampling operations. The addition of a sealing ring prevents gas leakage at the connection between the storage tank and the drill rod, ensuring stable pressure and complete gas collection during the sampling process.

[0014] Furthermore, a shut-off valve is fixedly installed at one end of the drill rod.

[0015] With the above approach, after sampling is completed, the channel for gas to enter the storage tank can be cut off in time by closing the shut-off valve, which facilitates the subsequent disassembly of the storage tank, reduces the risk of gas leakage, ensures the safety of operators, and also avoids gas leakage from causing environmental pollution.

[0016] Furthermore, the dustproof component includes a concave groove on the outer circumferential surface of the outer frame. A sealing ring is rotatably connected to the inner wall of the concave groove via a sealing bearing. A water inlet pipe is fixedly connected to the circumferential surface of the sealing ring. The water inlet pipe is connected to the output end of the pump body in the outside. Multiple nozzles are fixedly installed on the inner wall of the outer frame in a circular arrangement. The water inlet end of each nozzle is connected to the concave groove.

[0017] The above scheme uses an external pump to pump water into a concave groove through an inlet pipe, and then sprays it out through multiple nozzles, forming a water curtain during drilling. This effectively prevents impurities generated during drilling from entering the storage tank, further ensuring the purity of the gas sample. At the same time, it can also cool the drill bit, extend its service life, reduce drilling costs, and improve drilling efficiency.

[0018] Furthermore, a bracket is rotatably connected to the outer circumference of the storage tank, and the pneumatic motor is fixedly connected to the other end of the bracket. A cross-shaped fitting groove is opened in the central area of ​​one end of the storage tank, and a cross-shaped drive block is slidably inserted into the inner wall of the fitting groove. The output end of the pneumatic motor is fixedly connected to the drive block.

[0019] With the above scheme, when the pneumatic motor is working, its output end drives the drive block to rotate. Since the drive block is slidably inserted into the mating groove, it drives the storage tank to rotate. The rotation of the storage tank drives the drill rod to rotate synchronously, so that the drill bit can perform drilling work.

[0020] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0021] This pressure-holding sampling device based on pneumatic motor control can store sampled gas through a storage component. The combined use of one-way valve one and one-way valve two effectively reduces the risk of gas leakage and stably maintains the pressure of the sampled gas. During storage, the gas can be filtered through a filter plate to remove impurities and improve the purity of the gas sample. At the same time, the deformation force of the spring is used to assist in adjusting the internal pressure of the cavity to ensure the stability of the sampling process.

[0022] The dustproof components not only remove dust from the drill bit by spraying water jets, providing effective protection during drilling and preventing impurities from entering the storage tank, thus ensuring the purity of the gas samples, but also cool the drill bit by spraying water to form a water curtain, extending its service life, reducing drilling costs, and improving drilling efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this application;

[0024] Figure 2 For this application Figure 1 Enlarged schematic diagram of the structure at point A;

[0025] Figure 3 This is a schematic diagram of the overall structure of this application;

[0026] Figure 4 This is a breakdown diagram of the drill pipe and storage tank in this application;

[0027] Figure 5 This is a schematic diagram showing the disassembly of the storage tank and pneumatic motor in this application.

[0028] In the picture:

[0029] 1. Drill rod; 2. Outer frame; 3. Storage tank; 4. Pneumatic motor; 5. Drill bit; 6. Hollow drill;

[0030] 7. Storage components;

[0031] 701. Cavity; 702. Check valve one; 703. Check valve two; 704. Drain valve; 705. Sliding ring; 706. Filter plate; 707. Spring;

[0032] 8. Dustproof components;

[0033] 801. Concave groove; 802. Sealing ring; 803. Water inlet pipe; 804. Sprayer head;

[0034] 9. Slide rail; 10. Sealing ring; 11. Shut-off valve; 12. Bracket; 13. Fitting groove; 14. Drive block. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] Please see Figures 1-5 This embodiment of a pressure-holding sampling device based on pneumatic motor control includes a drill rod 1, an outer frame 2, a storage tank 3, and a pneumatic motor 4. The drill rod 1 is located inside the outer frame 2. One end of the outer frame 2 is fixedly connected to the drill rod 1 by bolts. The connection method ensures the relative position stability between the drill rod 1 and the outer frame 2, and facilitates disassembly and installation, as well as cleaning of impurities that have entered the outer frame 2. The drill rod 1 and the outer frame 2 are coaxially arranged to ensure that the drill rod 1 can move smoothly in the borehole during drilling, reducing deviation and vibration. A drill bit 5 is fixedly installed at the other end of the drill rod 1. A conical hollow drill 6 is provided at the other end of the outer frame 2. There is a gap between the hollow drill 6 and the drill bit 5, which allows gas in the coal seam to enter between the drill rod 1 and the outer frame 2 after drilling is completed.

[0037] A storage component 7 is provided between the drill pipe 1 and the storage tank 3 to store the sampled gas, reduce gas leakage, and maintain the pressure of the sampled gas.

[0038] The outer frame 2 is equipped with a dustproof component 8 to prevent impurities generated during the drilling process from entering the storage tank 3, thereby improving the purity of the sampled gas.

[0039] The storage assembly 7 includes a cavity 701 opened at one end of the drill rod 1 near the storage tank 3. Two symmetrically arranged one-way valves 702 are installed on the inner wall of the cavity 701, with the inlet ends of both one-way valves 702 located within the outer frame 2. A second one-way valve 703 is installed in the central area of ​​the inner wall of the storage tank 3, and a discharge valve 704 is fixedly installed on the outer circumferential surface of the storage tank 3. The one-way valves 702 and 703 control the unidirectional flow of gas, preventing backflow and ensuring accurate entry of gas into the storage tank 3 and maintaining stable pressure during sampling. The storage assembly 7 also includes a sliding connection to the inner wall of the cavity 701. The sliding ring 705 is connected to the inner wall of the cavity 701. A filter plate 706 is installed on the inner wall of the sliding ring 705. A spring 707 is fixedly connected to the side of the sliding ring 705. The other end of the spring 707 is fixedly connected to the inner wall of the cavity 701. By setting the filter plate 706, the gas entering the storage tank 3 can be filtered to remove impurities from the gas, improve the purity of the gas sample, and avoid impurities from interfering with subsequent analysis. The spring 707 can move the sliding ring 705 according to the deformation force of the spring 707 when the gas pressure changes, which helps to adjust the internal pressure of the cavity 701 and ensure the stability of the sampling process.

[0040] Multiple circumferentially distributed slide rails 9 are fixedly connected to the outer circumferential surface of one end of the drill rod 1. One end of the storage tank 3 is slidably sleeved with the drill rod 1 along the multiple slide rails 9, and a sealing ring 10 is provided between the storage tank 3 and the drill rod 1. The drill rod 1 and the storage tank 3 are on the same axis. The slide rails 9 are slidably sleeved with the storage tank 3, which can drive the drill rod 1 to rotate during the rotation of the storage tank 3, so as to realize the synchronous rotation of the drill rod 1 and the storage tank 3, which is convenient for drilling and sampling operations. The addition of the sealing ring 10 can prevent gas leakage at the connection between the storage tank 3 and the drill rod 1, and ensure the pressure stability and gas collection integrity during the sampling process. A shut-off valve 11 is fixedly installed at one end of the drill rod 1. After the sampling is completed, the channel for gas to enter the storage tank 3 can be cut off in time by closing the shut-off valve 11, which facilitates the subsequent disassembly of the storage tank 3, reduces the risk of gas leakage, ensures the safety of operators, and also avoids gas leakage from causing environmental pollution.

[0041] The dustproof component 8 includes a concave groove 801 formed on the outer circumferential surface of the outer frame 2. A sealing ring 802 is rotatably connected to the inner wall of the concave groove 801 via a sealing bearing. A water inlet pipe 803 is fixedly connected to the circumferential surface of the sealing ring 802, and the water inlet pipe 803 is connected to the output end of the external pump body. By using the sealing bearing to connect the sealing ring 802 to the concave groove 801, the sealing ring 802 can rotate flexibly within the concave groove 801 while effectively preventing water leakage from the connection point, thus ensuring the normal operation of the dustproof component 8. The outer frame 2 has multiple circumferentially distributed nozzles 804 fixedly installed on its inner wall. The water inlet of each nozzle 804 is connected to the concave groove 801. An external pump pumps water into the concave groove 801 through the water inlet pipe 803, and then sprays it out through the multiple nozzles 804. During the drilling process, a water curtain is formed, which effectively prevents impurities generated during drilling from entering the storage tank 3, further ensuring the purity of the gas sample. At the same time, it can also cool down the drill bit 5, extend the service life of the drill bit 5, reduce drilling costs, and improve drilling efficiency.

[0042] A bracket 12 is rotatably connected to the outer circumference of the storage tank 3. The pneumatic motor 4 is fixedly connected to the other end of the bracket 12. A cross-shaped fitting groove 13 is opened in the central area of ​​one end of the storage tank 3. A cross-shaped drive block 14 is slidably inserted into the inner wall of the fitting groove 13. The output end of the pneumatic motor 4 is fixedly connected to the drive block 14. When the pneumatic motor 4 is working, its output end drives the drive block 14 to rotate. Since the drive block 14 is slidably inserted into the fitting groove 13, the storage tank 3 is driven to rotate. The rotation of the storage tank 3 drives the drill rod 1 to rotate synchronously, so that the drill bit 5 can perform drilling work.

[0043] It should be noted that the pneumatic motor 4 is a device that converts the energy of compressed air into mechanical energy. It drives the internal mechanism (such as blades, pistons or gears) to rotate or reciprocate through the expansion of gas, thereby outputting power.

[0044] The working principle of the above embodiment is as follows: In the preparation work, firstly, an external vacuuming device is used to perform a vacuuming operation on the storage tank 3 through the discharge valve 704 to keep the storage tank 3 in a negative pressure state. Then, the whole is tilted so that the drill bit 5 is facing down and in contact with the rock wall.

[0045] Once preparation is complete, an external pump delivers gas to the pneumatic motor 4, causing its output to rotate and driving the storage tank 3 to rotate via the drive block 14. The storage tank 3, while rotating, drives the drill rod 1 to rotate via the slide rail 9. Since the outer frame 2 is fixed to the drill rod 1, the drill rod 1 and the outer frame 2 rotate synchronously, drilling into the rock wall. Subsequently, an external pump delivers water to the inlet pipe 803 and discharges it into the concave groove 801. The water entering the concave groove 801 is then sprayed onto the drill bit 5 through multiple nozzles 804, cooling the drill bit 5 and preventing impurities from entering the outer frame 2 during drilling. When the drill bit 5 enters the sampling area, the pneumatic motor 4 stops. Then, the pressure of the gas inside the rock wall is released through the drill bit 5. The gas enters the outer frame 2 through the gap between the drill bit 5 and the hollow drill 6, and then enters the cavity 701 through two one-way valves 702. The gas entering the cavity 701 is filtered by the filter plate 706 and then enters the storage tank 3 through the one-way valve 703 for gas storage. During the entire process, the presence of water sources at the drill bit 5 and the hollow drill 6 prevents floating impurities from entering the cavity 701. Due to the high pressure of the gas in the coal seam, it can pass through the water sources in the drill bit 5 and the hollow drill 6 and enter the outer frame 2. After sampling is completed, the shut-off valve 11 is closed to seal the cavity 701, reducing gas leakage. Then, the storage tank 3 is extracted, which allows for transportation of the storage tank 3. Subsequently, the gas in the storage tank 3 is discharged through the discharge valve 704.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure maintaining sampling device based on pneumatic motor control, comprising a drill rod (1), an outer frame (2), a storage tank (3), a pneumatic motor (4), characterized in that: The drill rod (1) is located inside the outer frame (2). One end of the outer frame (2) is fixedly connected to the drill rod (1) by bolts. The drill rod (1) and the outer frame (2) are coaxially arranged. The other end of the drill rod (1) is fixedly installed with a drill bit (5). The other end of the outer frame (2) is provided with a conical hollow drill (6). There is a gap between the hollow drill (6) and the drill bit (5). A storage assembly (7) is provided between the drill pipe (1) and the storage tank (3); The outer frame (2) is equipped with a dustproof component (8).

2. The pressure-holding sampling device based on pneumatic motor control according to claim 1, characterized in that: The storage assembly (7) includes a cavity (701) opened at one end of the drill rod (1) near the storage tank (3). Two symmetrically arranged one-way valves (702) are installed on the inner wall of the cavity (701). The air inlet ends of the two one-way valves (702) are located inside the outer frame (2). A one-way valve (703) is installed in the central area of ​​the inner wall of the storage tank (3). A discharge valve (704) is fixedly installed on the outer circumferential surface of the storage tank (3).

3. The pressure-holding sampling device based on pneumatic motor control according to claim 2, characterized in that: The storage assembly (7) also includes a sliding ring (705) that is slidably connected to the inner wall of the cavity (701). A filter plate (706) is installed on the inner wall of the sliding ring (705). A spring (707) is fixedly connected to the side of the sliding ring (705). The other end of the spring (707) is fixedly connected to the inner wall of the cavity (701).

4. The pressure-holding sampling device based on pneumatic motor control according to claim 1, characterized in that: Multiple circumferentially distributed slide rails (9) are fixedly connected to the outer circumferential surface of one end of the drill rod (1). One end of the storage tank (3) is slidably sleeved with the drill rod (1) along the multiple slide rails (9). A sealing ring (10) is provided between the storage tank (3) and the drill rod (1). The drill rod (1) and the storage tank (3) are on the same axis.

5. The pressure-holding sampling device based on pneumatic motor control according to claim 1, characterized in that: A shut-off valve (11) is fixedly installed at one end of the drill rod (1).

6. The pressure-holding sampling device based on pneumatic motor control according to claim 1, characterized in that: The dustproof component (8) includes a concave groove (801) on the outer circumferential surface of the outer frame (2). The inner wall of the concave groove (801) is rotatably connected to a sealing ring (802) through a sealing bearing. The circumferential surface of the sealing ring (802) is fixedly connected to a water inlet pipe (803). The water inlet pipe (803) is connected to the output end of the pump body in the outside. Multiple nozzles (804) are fixedly installed on the inner wall of the outer frame (2) in a circular distribution. The water inlet end of each nozzle (804) is connected to the concave groove (801).

7. The pressure-holding sampling device based on pneumatic motor control according to claim 1, characterized in that: The storage tank (3) is rotatably connected to a bracket (12) on its outer circumference. The pneumatic motor (4) is fixedly connected to the other end of the bracket (12). A cross-shaped fitting groove (13) is opened in the central area of ​​one end of the storage tank (3). A cross-shaped drive block (14) is slidably inserted into the inner wall of the fitting groove (13). The output end of the pneumatic motor (4) is fixedly connected to the drive block (14).

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