A device for measuring gas content in underground coal sampling

Abstract

The present invention discloses a device for measuring the gas content of coal samples taken on-site underground, and relates to the technical field of coal sample gas detection, comprising: a device bottom plate, which is horizontally placed on the ground beside a well, and on which four supporting columns are fixedly mounted, and a middle layer plate is horizontally fixedly mounted above the four supporting columns, and a measuring box is fixedly mounted above the device bottom plate, and the measuring box is embedded in the middle of the middle layer plate; a constant pressure component, which is placed on the front side of the measuring box and fixedly mounted on the upper surface of the device bottom plate, and its output pipe is connected to the interior of the measuring box; a measuring component, which is placed inside the measuring box and fixedly mounted on the device bottom plate and the middle layer plate; a constant temperature component, which is placed inside the measuring box and fixedly mounted between the device bottom plate and the middle layer plate, to improve the accuracy of gas content measurement.

Description

Technical Field

[0001] The invention relates to the technical field of coal sample gas detection, and in particular to a device for measuring the gas content of coal samples taken on-site underground. Background Art

[0002] Gas is a general term for toxic and harmful gases mainly composed of methane (CH4) in coal mines, and sometimes methane is also referred to separately. Gas is formed by the decomposition of cellulose and organic matter by anaerobic bacteria in the early stage of ancient plants being accumulated into coal. In a high temperature and high pressure environment, as the coal formation process continues to generate, gas (mainly methane) is a flammable and explosive gas. When it is mixed with oxygen in the air and within a certain concentration range (usually called the explosion limit, the explosion limit of methane is 5% to 15%), it may explode when it encounters a fire source such as an open flame, an electric spark or a high-temperature object. The gas adsorbed in the coal seam will be desorbed from the surface of the coal body when the pressure is reduced. By measuring the amount of gas desorbed from a unit mass of coal under certain conditions, the gas content can be calculated, so that corresponding policies can be formulated to effectively avoid the occurrence of safety accidents.

[0003] When the desorption method is used to measure the gas content, the gas content is equal to the sum of the desorbed gas, residual gas and lost gas. In the traditional measurement method, the coal sample is extracted and sealed in a sealed can, and then sent to the device for desorption. After the desorption is completed, the sealed can must be taken out, and then the coal sample inside is crushed and the residual gas is measured. This method will not only greatly reduce the gas measurement efficiency in the process, but also lose a part of the gas in the process and it cannot be measured, which greatly affects the accuracy of the gas content measurement.

[0004] Therefore, it is necessary to provide a device for measuring the gas content of coal samples taken underground to solve the above problems. Summary of the invention

[0005] To achieve the above object, the present invention provides the following technical solution: a device for measuring gas content in underground coal samples, comprising:

[0006] The device bottom plate is horizontally placed on the ground beside the drilling well, and four supporting columns are fixedly installed on it. A middle plate is horizontally fixedly installed above the four supporting columns. A measuring box is fixedly installed above the device bottom plate, and the measuring box is embedded in the middle of the middle plate.

[0007] A constant pressure assembly is placed on the front side of the measuring box, fixedly mounted on the upper surface of the bottom plate of the device, and its output pipe is connected to the interior of the measuring box;

[0008] A measuring component is placed inside the measuring box and fixedly mounted on the bottom plate and the middle plate of the device;

[0009] The constant temperature component is placed inside the measuring box and fixedly assembled between the bottom plate and the middle plate of the device.

[0010] Preferably, the measuring component comprises:

[0011] A residual gas separation chamber is fixedly mounted on the upper surface of the bottom plate of the device and coaxially embedded in the middle of the middle plate. A ventilation hose is arranged above the residual gas separation chamber, and a residual gas content measuring device is connected to the other end of the ventilation hose. The residual gas content measuring device is fixedly mounted on the upper surface of the middle plate.

[0012] The desorbed gas separation chamber is coaxially placed inside the residual gas separation chamber, and a ventilation hose is arranged below the desorbed gas separation chamber, and the other end of the ventilation hose is connected to a desorbed gas content meter, and the desorbed gas content meter is fixedly assembled on the upper surface of the middle plate.

[0013] Preferably, three coal collecting funnels are fixedly installed between the residual gas separation chamber and the desorption gas separation chamber, and a crushing assembly is fixedly installed under each of the coal collecting funnels.

[0014] Preferably, a vacuum motor is connected to the outside of the residual gas separation chamber. The vacuum motor is placed between the device bottom plate and the middle plate, and is fixedly mounted on the upper surface of the device bottom plate.

[0015] Preferably, the desorption gas separation chamber comprises:

[0016] A lower sealing tank is coaxially placed inside the residual gas separation chamber and fixedly assembled above the bottom plate of the device, a first compression spring is coaxially fixedly assembled on the inner wall of the bottom, a piston is coaxially fixed above the first compression spring, a first fitting pad is fixedly assembled above the piston, and the piston and the first fitting pad are slidably placed inside the lower sealing tank;

[0017] The upper sealing tank has its upper portion fixedly assembled on the front end of a mechanical arm, and the mechanical arm is fixedly assembled on the upper surface of the measuring box.

[0018] Preferably, a second compression spring is coaxially fixedly mounted on the inner wall of the upper end of the upper sealed tank, a crushed coal assembly is fixedly mounted on the lower end of the second compression spring, and the crushed coal assembly is slidably placed inside the upper sealed tank.

[0019] Preferably, the coal crushing assembly comprises:

[0020] The fixed shell is coaxially fixedly assembled below the second compression spring, and a piston ring is coaxially arranged below it. The piston ring is coaxially slidably arranged inside the upper sealing tank. A rotating block is coaxially rotatably assembled in the middle part below the fixed shell, and a second fitting pad is fixedly assembled below the rotating block.

[0021] Preferably, two face milling cutters are embedded on the second fitting pad, the face milling cutters are rotatably assembled on the rotating block, and a plurality of cutter heads are provided on the two face milling cutters.

[0022] Preferably, the two face milling cutters are coaxially fixedly mounted on the output shafts of the two first drive motors, the two first drive motors are mounted on the upper surface of the rotating block, and the rotating block is coaxially fixedly mounted on the output shaft of the second drive motor, and the second drive motor is fixedly mounted on the inner wall of the top end of the fixed shell.

[0023] Preferably, a portion of thread is provided at the joint between the face milling cutter and the rotating block.

[0024] Compared with the prior art, the present invention provides a device for measuring gas content in underground coal samples, which has the following beneficial effects:

[0025] The present invention is provided with a constant pressure component and a constant temperature component, so that the measuring box always maintains a constant pressure and temperature, and prevents changes in the gas volume caused by pressure or temperature changes, thereby causing errors in the measurement results. In addition, the set measuring component can directly seal the obtained coal sample, which greatly shortens the exposure time of the coal sample and avoids the influence of the frequent changes in the environment on the lost gas, thereby facilitating the determination of the lost gas content and improving the accuracy of the gas content determination. Then, desorption is carried out to determine the desorbed gas content. After the desorbed gas content is determined, the measuring component is provided with a coal crushing component and a pulverizing component, which can pulverize the coal sample without opening it, and then determine its residual gas content, further avoiding losses in the conversion process and improving the accuracy of the gas content determination. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of a device for measuring gas content in underground coal samples;

[0027] Figure 2 It is a schematic diagram of the structure of a measuring component in a device for measuring gas content in underground coal sampling;

[0028] Figure 3 It is a structural schematic diagram of a desorption gas separation chamber in a device for measuring gas content in underground coal sampling on site;

[0029] Figure 4 It is a schematic diagram of the structure of a coal crushing component in a device for measuring gas content in underground coal sampling;

[0030] In the figure: 1, device bottom plate; 2, support column; 3, measurement box; 4, middle plate; 5, constant pressure component; 6, measurement component; 7, constant temperature component; 8, vacuum motor; 61, residual gas separation chamber; 62, desorption gas separation chamber; 63, mechanical arm; 64, desorption gas content measuring device; 65, ventilation hose; 66, residual gas content measuring device; 67, coal collecting funnel; 68, crushing component; 621, lower sealing tank; 622, upper Sealing can; 623, first compression spring; 624, second compression spring; 625, piston; 626, first fitting pad; 627, coal sample; 628, coal crushing assembly; 6281, fixed shell; 6282, rotating block; 6283, second fitting pad; 6284, face milling cutter; 6285, cutter head; 6286, first drive motor; 6287, second drive motor; 6288, thread; 6289, piston ring. DETAILED DESCRIPTION

[0031] See also Figure 1 to Figure 4 The present invention provides a device for measuring gas content in underground coal sampling on site, comprising:

[0032] The device bottom plate 1 is horizontally placed on the ground beside the drilling well, and four supporting columns 2 are fixedly installed on it. A middle plate 4 is horizontally fixedly installed above the four supporting columns 2. A measuring box 3 is fixedly installed above the device bottom plate 1, and the measuring box 3 is embedded in the middle of the middle plate 4.

[0033] The constant pressure assembly 5 is placed on the front side of the measuring box 3, fixedly assembled on the upper surface of the device bottom plate 1, and its output pipe is connected to the interior of the measuring box 3;

[0034] The measuring component 6 is placed inside the measuring box 3 and fixedly assembled on the device bottom plate 1 and the middle plate 4;

[0035] The constant temperature component 7 is placed inside the measuring box 3 and fixedly assembled between the device bottom plate 1 and the middle plate 4;

[0036] As a preferred embodiment, the constant pressure component 5 and the constant temperature component 7 keep the measuring box 3 at constant pressure and temperature at all times, preventing the change of gas volume due to pressure or temperature changes, thereby causing errors in the measurement results. The measuring component 6 can directly seal the obtained coal sample 627, which greatly shortens the exposure time of the coal sample 627 and avoids the influence of the frequent changes in the environment on the lost gas, thereby facilitating the determination of the lost gas content and improving the accuracy of the gas content determination. Then, desorption is performed to determine the desorbed gas content. After the desorbed gas content is determined, the measuring component 6 can crush the coal sample 627 without opening it, and then determine its residual gas content, further avoiding losses during the conversion process and improving the accuracy of the gas content determination.

[0037] Further, the measuring component 6 comprises:

[0038] The residual gas separation chamber 61 is fixedly mounted on the upper surface of the device bottom plate 1 and coaxially embedded in the middle of the middle plate 4. A ventilation hose 65 is arranged above the residual gas separation chamber 61, and the other end of the ventilation hose 65 is connected to a residual gas content measuring device 66. The residual gas content measuring device 66 is fixedly mounted on the upper surface of the middle plate 4.

[0039] The desorbed gas separation chamber 62 is coaxially placed inside the residual gas separation chamber 61, and a ventilation hose 65 is provided below the desorbed gas separation chamber 62, and the other end of the ventilation hose 65 is connected to a desorbed gas content measuring device 64, and the desorbed gas content measuring device 64 is fixedly assembled on the upper surface of the middle plate 4;

[0040] As a preferred embodiment, in the working state, the residual gas separation chamber 61 is always in a closed state, and sealing gaskets are provided at the connections between the residual gas separation chamber 61 and the two ventilation hoses 65 and the desorption gas separation chamber 62 .

[0041] Furthermore, three coal collecting funnels 67 are fixedly installed between the residual gas separation chamber 61 and the desorption gas separation chamber 62, and a crushing assembly 68 is fixedly installed below each of the coal collecting funnels 67;

[0042] As a preferred embodiment, when the desorption gas content is determined, the desorption gas separation chamber 62 will be opened and the coal sample 627 will be crushed to facilitate the separation of the residual gas therein. The crushed coal sample 627 will fall into the corresponding crushing components 68 through three coal collecting funnels 67 for further crushing, and the crushed shale powder will fall to the bottom of the residual gas separation chamber 61. The separated residual gas will rise through the ventilation hose 65 above and enter the residual gas content meter 66 to measure the residual gas content, thereby further improving the efficiency and accuracy of the gas content measurement.

[0043] Furthermore, the residual gas separation chamber 61 is externally connected with a vacuum motor 8, the vacuum motor 8 is placed between the device bottom plate 1 and the middle plate 4, and is fixedly assembled on the upper surface of the device bottom plate 1;

[0044] As a preferred embodiment, after the coal sample 627 has completed desorption, the vacuum motor 8 will start to extract the air in the residual gas separation chamber 61 to prevent the air therein from causing measurement errors in the residual gas content.

[0045] Further, the desorption gas separation chamber 62 comprises:

[0046] The lower sealing tank 621 is coaxially placed inside the residual gas separation chamber 61 and fixedly assembled above the device bottom plate 1. A first compression spring 623 is coaxially fixedly assembled on the inner wall of the bottom thereof. A piston 625 is coaxially fixed above the first compression spring 623. A first fitting pad 626 is fixedly assembled above the piston 625. The piston 625 and the first fitting pad 626 are slidably placed inside the lower sealing tank 621.

[0047] The upper sealing tank 622 is fixedly mounted on the front end of the mechanical arm 63, and the mechanical arm 63 is fixedly mounted on the upper surface of the measuring box 3;

[0048] As a preferred embodiment, due to the particularity of the coal sample 627 during the acquisition process, its upper and lower bottom surfaces may be irregular concave and convex surfaces. In order to ensure the sealing inside, a first fitting pad 626 is provided to fit the bottom surface of the coal sample 627. The piston 625 can discharge the air in the lower sealed tank 621 during the movement to ensure the accuracy of the measurement. An air outlet is provided in the middle of the first fitting pad 626 and the piston 625, and a ventilation hose 65 connected to the desorbed gas content meter 64 is installed thereon to facilitate the measurement of the desorbed gas. A sealing pad is provided at the connection between the upper sealed tank 622 and the lower sealed tank 621. When working, it is subjected to the pressure of the mechanical arm 63 to keep its interior in a closed state.

[0049] Furthermore, a second compression spring 624 is coaxially fixedly mounted on the inner wall of the upper end of the upper sealed tank 622, and a coal crushing assembly 628 is fixedly mounted on the lower end of the second compression spring 624. The coal crushing assembly 628 is slidably placed inside the upper sealed tank 622;

[0050] As a preferred embodiment, in the initial state, the first compression spring 623 and the second compression spring 624 are in a natural state, the upper surface of the first fitting pad 626 is flush with the upper surface of the lower sealed tank 621, and the lower surface of the crushed coal assembly 628 is flush with the lower surface of the upper sealed tank 622, and the mechanical arm 63 pulls the upper sealed tank 622 out of the area. After the preparation is completed, the selected coal sample 627 is placed in the lower sealed tank 621. As the coal sample 627 is placed, the first compression spring 623 is compressed, and the piston 625 descends. When the first compression spring 623 is pressed, the piston 625 is pressed down, and the first compression spring 623 is pressed down. After being compressed to the limit position under the gravity, the robotic arm 63 is started to drive the upper sealed tank 622 to be pressed in from the upper side until the upper sealed tank 622 contacts the lower sealed tank 621 to form a sealed tank. After the desorption is completed and the vacuum motor 8 has finished working, the robotic arm 63 is started to pull the upper sealed tank 622 upward until the coal crushing assembly 628 is no longer in contact with the coal sample 627 (at this time, the upper sealed tank 622 has not separated from the residual gas separation chamber 61), the coal crushing assembly 628 is started, and the coal crushing assembly 628 is kept at a certain feed speed to cut the coal sample 627 through the robotic arm 63 and the first compression spring 623.

[0051] Further, the coal crushing assembly 628 includes:

[0052] The fixed shell 6281 is coaxially fixedly assembled below the second compression spring 624, and a piston ring 6289 is coaxially arranged below the fixed shell 6281. The piston ring 6289 is coaxially slidably arranged inside the upper sealing tank 622. A rotating block 6282 is coaxially rotatably assembled in the middle part below the fixed shell 6281, and a second fitting pad 6283 is fixedly assembled below the rotating block 6282.

[0053] As a preferred embodiment, the functions of the piston ring 6289 and the second fitting pad 6283 are similar to those of the piston 625 and the first fitting pad 626, respectively.

[0054] Furthermore, two face milling cutters 6284 are embedded on the second bonding pad 6283, and the face milling cutters 6284 are rotatably assembled on the rotating block 6282, and a plurality of cutter heads 6285 are provided on the two face milling cutters 6284;

[0055] As a preferred embodiment, in the initial state, the lower plane of the second fitting pad 6283 is lower than the lower plane of the face milling cutter 6284 , preventing the face milling cutter 6284 from contacting the coal sample 627 when not started, thereby causing damage to the cutter head 6285 .

[0056] Furthermore, the two face milling cutters 6284 are coaxially fixedly assembled on the output shafts of the two first drive motors 6286, the two first drive motors 6286 are both assembled on the upper surface of the rotating block 6282, and the rotating block 6282 is coaxially fixedly assembled on the output shaft of the second drive motor 6287, and the second drive motor 6287 is fixedly assembled on the inner wall at the top of the fixed shell 6281.

[0057] Further, a portion of thread 6288 is provided at the mating position between the face milling cutter 6284 and the rotating block 6282;

[0058] As a preferred embodiment, a rotatable thread ring is provided below the internal thread of the rotating block 6282 which cooperates with the thread 6288. When cutting work is required, the two first drive motors 6286 are turned on first. Under the rotation of the two first drive motors 6286, the face milling cutter 6284 rotates along the thread 6288 and moves downward under the action of the thread 6288 until the upper end of the thread 6288 cooperates with the rotating thread ring on the rotating block 6282. Then, the face milling cutter 6284 stops descending, and the lower surface of the first drive motor 6286 coincides with the upper surface of the rotating block 6282. At this time, the lower side plane of the second fitting pad 6283 is higher than the lower side plane of the face milling cutter 6284. With the high-speed rotation of the first drive motor 6286, the face milling cutter 6284 continuously cuts the coal sample 627. At the same time, the second drive motor 6287 is started to drive the rotating block 6282 to rotate, so that the two face milling cutters 6284 can better complete the cutting work.

[0059] During the specific implementation, the following steps are included: adjusting the constant pressure component 5 and the constant temperature component 7 to the appropriate air pressure and temperature, placing the selected coal sample 627 into the lower sealed tank 621, and making the upper sealed tank 622 fit with the lower sealed tank 621 through the mechanical arm 63, opening the desorption gas content meter 64 to measure the desorption gas therein, after the measurement is completed, turning on the vacuum motor 8 to extract the air in the residual gas separation chamber 61, and then opening the desorption gas separation chamber 62 through the mechanical arm 63, opening the residual gas content meter 66, and starting the coal crushing component 628 therein to cut the coal sample 627, the cut coal sample 627 enters the corresponding crushing component 68 through three coal collecting funnels 67, the coal sample 627 powder falls to the bottom of the residual gas separation chamber 61, and the residual gas rises into the residual gas content meter 66, after the measurement is completed, the sum of the measured desorption gas content and the residual gas content plus the loss gas content (calculated using the USBM method) is the gas content.

[0060] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for measuring gas content in underground coal samples, characterized in that: include: The device bottom plate (1) is horizontally placed on the ground next to the drilling well, and four supporting columns (2) are fixedly installed on it. A middle plate (4) is horizontally fixedly installed above the four supporting columns (2). A measuring box (3) is fixedly installed above the device bottom plate (1), and the measuring box (3) is embedded in the middle of the middle plate (4); A constant pressure assembly (5) is placed on the front side of the measuring box (3), fixedly mounted on the upper surface of the device bottom plate (1), and its output pipe is connected to the interior of the measuring box (3); A measuring component (6) is placed inside the measuring box (3) and fixedly mounted on the device bottom plate (1) and the middle plate (4); A constant temperature component (7) is placed inside the measuring box (3) and fixedly assembled between the device bottom plate (1) and the middle plate (4); The measuring component (6) comprises: A residual gas separation chamber (61) is fixedly mounted on the upper surface of the device bottom plate (1) and coaxially embedded in the middle of the middle plate (4). A ventilation hose (65) is arranged above the residual gas separation chamber (61), and the other end of the ventilation hose (65) is connected to a residual gas content measuring device (66). The residual gas content measuring device (66) is fixedly mounted on the upper surface of the middle plate (4); A desorbed gas separation chamber (62) is coaxially placed inside the residual gas separation chamber (61), and a ventilation hose (65) is provided below the desorbed gas separation chamber (62), the other end of which is connected to a desorbed gas content measuring device (64), and the desorbed gas content measuring device (64) is fixedly mounted on the upper surface of the middle plate (4); Three coal collecting funnels (67) are fixedly installed between the residual gas separation chamber (61) and the desorption gas separation chamber (62), and a crushing assembly (68) is fixedly installed below each of the coal collecting funnels (67); The desorbed gas separation chamber (62) comprises: A lower sealing tank (621) is coaxially placed inside the residual gas separation chamber (61) and fixedly mounted above the device bottom plate (1); a first compression spring (623) is coaxially fixedly mounted on the inner wall of the bottom; a piston (625) is coaxially fixed above the first compression spring (623); a first fitting pad (626) is fixedly mounted above the piston (625); the piston (625) and the first fitting pad (626) are slidably placed inside the lower sealing tank (621); The upper sealing tank (622) is fixedly mounted on the front end of a mechanical arm (63) and the mechanical arm (63) is fixedly mounted on the upper surface of the measuring box (3).

2. The device for measuring gas content in underground coal sampling on site according to claim 1, characterized in that: The residual gas separation chamber (61) is externally connected to a vacuum motor (8), and the vacuum motor (8) is placed between the device bottom plate (1) and the middle plate (4), and is fixedly mounted on the upper surface of the device bottom plate (1).

3. The device for measuring gas content in underground coal sampling on site according to claim 1, characterized in that: A second compression spring (624) is coaxially fixedly mounted on the inner wall of the upper end of the upper sealed tank (622), and a coal crushing assembly (628) is fixedly mounted on the lower end of the second compression spring (624). The coal crushing assembly (628) is slidably placed inside the upper sealed tank (622).

4. The device for measuring gas content in underground coal sampling on site according to claim 3, characterized in that: The coal crushing assembly (628) comprises: The fixed shell (6281) is coaxially fixedly assembled below the second compression spring (624), and a piston ring (6289) is coaxially arranged below it. The piston ring (6289) is coaxially slidably arranged inside the upper sealing tank (622). A rotating block (6282) is coaxially rotatably assembled in the middle part below the fixed shell (6281), and a second fitting pad (6283) is fixedly assembled below the rotating block (6282).

5. The device for measuring gas content in underground coal sampling on site according to claim 4, characterized in that: Two face milling cutters (6284) are embedded on the second fitting pad (6283), and the face milling cutters (6284) are rotatably assembled on the rotating block (6282), and a plurality of cutter heads (6285) are provided on the two face milling cutters (6284).

6. The device for measuring gas content in underground coal sampling on site according to claim 5, characterized in that: The two face milling cutters (6284) are respectively coaxially fixedly mounted on the output shafts of the two first drive motors (6286), the two first drive motors (6286) are both mounted on the upper surface of the rotating block (6282), and the rotating block (6282) is coaxially fixedly mounted on the output shaft of the second drive motor (6287), and the second drive motor (6287) is fixedly mounted on the inner wall of the top end of the fixed shell (6281).

7. The device for measuring gas content in underground coal sampling on site according to claim 6, characterized in that: A portion of thread (6288) is provided at the joint between the face milling cutter (6284) and the rotating block (6282).

Images