Calibration device for mine methane sensor

Abstract

The utility model relates to the technical field of underground mine safety equipment, especially to a kind of calibration device of mine methane sensor.The utility model places the two loading bottles of methane sensor in base, supports loading bottle by base, and is wrapped with shell outside base and loading bottle, the bottom of shell is connected with base to drive methane loading bottle to move, and left and right two parts shell are fixedly connected by fastening assembly, when using, first, fastening assembly is disassembled, and the shell of left and right two parts is pulled to two sides, so that base and loading bottle are exposed, at this time, the pipeline of flowmeter is connected to the methane sensor to be checked to check, after checking, pipeline is disconnected, two parts shell is pushed from two sides to middle, so that shell bottom is connected with base, and fastening assembly is fixed.

Description

Technical Field

[0001] This application relates to the field of underground mining safety equipment technology, and in particular to a calibration device for a mining methane sensor. Background Technology

[0002] In coal mine operations, to ensure safe production and prevent major accidents, methane sensors are used to periodically measure the methane content in underground roadways. Whether the methane content exceeds the standard is used to determine if there are any safety hazards. However, after a period of use, methane sensors are prone to inaccurate measurements, posing a significant safety risk to coal mine production. To accurately measure underground methane content, the accuracy of methane sensors needs frequent calibration to ensure accurate detection. This has led to the development of methane sensor calibrators. Methane sensor calibrators are mainly used to calibrate and standardize various methane sensors in coal mines, possessing both air zeroing and methane gas sample calibration functions. Generally, calibrators use two containers, one containing a certain amount of compressed air and the other a compressed methane standard gas sample. During use, the compressed air and compressed methane standard gas sample are respectively filled into the methane sensor, controlling a certain flow rate output. However, in existing methane sensor calibrators, the two containers are mostly placed in a housing, which is prone to shaking and wear. Summary of the Invention

[0003] The present invention aims to solve the above problems and thus provide a calibration device for a methane sensor used in mining.

[0004] The technical solution adopted by this utility model to solve the aforementioned problem is: A calibration device for a mining methane sensor includes two containers, one for compressed air and the other for compressed methane gas. Each container is connected to a flow meter, the other end of which is connected to the methane sensor to be calibrated via a pipe. The bottom of each container is provided with a base for placing the container. The base and the container are fitted with a housing, which is divided into left and right parts. The bottom of the housing is snapped into the base, and the left and right parts of the housing are fixedly connected by a fastening assembly.

[0005] Compared with the prior art, the advantages of this utility model, which adopts the above technical solution, are as follows: This invention places two containers of a methane sensor in a base, which supports the containers. A housing is installed around the base and the containers, with the bottom of the housing engaging with the base to move the methane containers. The left and right housing parts are fixedly connected by a fastening assembly. In use, the fastening assembly is first removed, and the left and right housing parts are pulled to the sides to expose the base and containers. Then, the flow meter pipe is connected to the methane sensor to be calibrated for calibration. After calibration, the pipe is disconnected, and the two housing parts are pushed from both sides towards the middle to engage with the bottom of the housing with the base. The fastening assembly is then fixed in place.

[0006] As a preferred embodiment, a further technical solution of this utility model is: Both the left and right shell sections have vertical first locking grooves on their outer walls, and the base has a horizontal second locking groove on its bottom. The fastening assembly includes two opposing C-shaped clamps, which engage with the first and second locking grooves, with their inner ends fixedly connected. The two C-shaped clamps facilitate the connection of the two shell sections, and the first and second locking grooves limit the position of the two C-shaped clamps, preventing them from moving and disengaging on the shell.

[0007] A snap-fit ​​block is provided at the bottom inner end of the housing, and a snap-fit ​​groove is provided on the outer wall of the base. The snap-fit ​​block is used to snap into the corresponding snap-fit ​​groove. Through the cooperation of the snap-fit ​​block and the snap-fit ​​groove, the bottom of the housing and the base can be quickly snapped together.

[0008] The thickness of the snap-fit ​​block gradually decreases from the outside to the inside, and the inner surface of the snap-fit ​​block is arc-shaped. A handle is provided on the outer wall of the housing corresponding to the snap-fit ​​block position. With the snap-fit ​​block having the above structure, when the left and right housing parts move towards the middle, the inner arc surface of the snap-fit ​​block gradually contacts the outer wall of the base, causing the inner front and rear sides of the housing to open slightly forward and backward. When the snap-fit ​​block moves to the snap-fit ​​groove position, the snap-fit ​​block springs into the snap-fit ​​groove under the elastic drive of the housing. At this time, the left and right housing parts align and are fixed in position with the base.

[0009] A cover plate is provided on the top of the housing, and a third locking groove is opened on the top of the cover plate. The tops of the two C-shaped clamping plates are locked into the third locking groove. A limiting groove is provided on the top of the housing, and a limiting plate with the same horizontal dimension as the limiting groove is fixed to the bottom of the cover plate. When the cover plate covers the top of the housing, the limiting plate is inserted into the limiting groove. The third locking groove has the same function as the first and second locking grooves, which is to limit the position of the C-shaped clamping plates. The cooperation between the limiting plate and the limiting groove makes the connection between the cover plate and the top of the housing more stable.

[0010] Each of the filling bottles is equipped with a switch on its top, and a flow regulating valve with a pressure reducer is installed at the other end of the switch. The outlet of the filling bottle is controlled by the switch, and the output flow rate of the filling bottle is controlled by the flow regulating valve. Attached Figure Description

[0011] Figure 1 This is a top-view perspective view of the external structure of an embodiment of this application; Figure 2 This is a bottom-view perspective view of the external structure of an embodiment of this application; Figure 3 This is a top-view split diagram of an embodiment of this application; Figure 4 This is a bottom view split diagram of an embodiment of this application; Figure 5 yes Figure 4 A magnified view of part A in the image; Figure 6 This is a schematic diagram of the base and bottle structure according to an embodiment of this application.

[0012] In the diagram: 1. Cover plate; 11. Third snap-fit ​​groove; 12. Limiting plate; 2. Housing; 21. Limiting groove; 22. First snap-fit ​​groove; 23. Handle; 24. Snap-fit ​​block; 3. Fastening assembly; 4. Base; 41. Snap-fit ​​groove; 42. Second snap-fit ​​groove; 43. Receiving groove; 5. Bottle; 6. Flow meter; 7. Pressure regulator; 8. Switch; 9. Flow regulating valve. Detailed Implementation

[0013] The present invention will be further described below with reference to embodiments, the purpose of which is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0014] Reference Figure 1-6This application discloses a calibration device for a mining methane sensor, comprising two containers 5, one for compressed air and the other for compressed methane gas. A switch 8 is connected to the top of each container 5, and a flow regulating valve 9 with a pressure reducer 7 is installed at the other end of the switch 8. The switch 8 controls the outlet of the container 5, and the flow regulating valve 9 controls the output flow rate of the container 5. The outlets of the two flow regulating valves 9 are connected to a tee pipe via steel pipes. The bottom opening of the tee pipe is connected to the bottom of a flow meter 6, and the top of the flow meter 6 is connected to the methane sensor to be calibrated via a pipe. A base 4 is provided at the bottom of each container 5 for placing the container 5. The base 4 has a receiving groove 43 of the same size as the two bottles 5. A clearance groove is provided between the two receiving grooves 43 to avoid the flow meter 6 and the connecting pipe. When the two bottles 5 are placed in the receiving groove 43, the bottom of the bottles 5 is located in the clearance groove. The base 4 and the bottles 5 are fitted with a housing 2. The housing 2 is divided into left and right parts. The left housing 2 and the right housing 2 have a C-shaped structure in the horizontal direction. When the inner ends of the left housing 2 and the right housing 2 are connected, the internal size is equal to the size of the base 4, so that the base 4 can be stably placed in the housing 2. The bottom of the housing 2 and the base 4 are snapped together. The left and right parts of the housing 2 are fixedly connected by fastening components 3.

[0015] In this embodiment, both the left and right shell 2 have vertical first snap-fit ​​grooves 22 on their outer walls, with the two first snap-fit ​​grooves 22 positioned opposite each other. The bottom of the base 4 has a horizontal second snap-fit ​​groove 42, with the first and second snap-fit ​​grooves 22 having equal depths. The fastening assembly 3 includes two opposing C-shaped clamps, which snap into the first and second snap-fit ​​grooves 22 and 42. The inner top and bottom ends of the two C-shaped clamps overlap in an L-shape, with bolt holes at the overlap position. Bolts are screwed into the bolt holes at the top and bottom of the two C-shaped clamps to secure them together. The two C-shaped clamps are positioned to facilitate the connection and fixation of the left and right shell 2. The first and second snap-fit ​​grooves 22 and 42 limit the position of the two C-shaped clamps, preventing them from moving and disengaging on the shell 2. The bolts and bolt holes allow for quick and easy fixation of the two C-shaped clamps.

[0016] In this embodiment, snap-fit ​​blocks 24 are fixed on the front and rear sidewalls of the left and right housings 2. Snap-fit ​​grooves 41 are formed on the front and rear outer walls of the base 4 at the same height as the snap-fit ​​blocks 24, and the snap-fit ​​blocks 24 are used to snap into the corresponding grooves 41. Through the cooperation of the snap-fit ​​blocks 24 and the grooves 41, the bottom of the housing 2 and the base 4 can be quickly snapped together. The thickness of the snap-fit ​​blocks 24 gradually decreases from the outside to the inside, making the inner surface of the snap-fit ​​blocks 24 an arc-shaped surface. A handle 23 is provided on the outer wall of the housing 2 corresponding to the position of the snap-fit ​​blocks 24. By setting the snap-fit ​​block 24 with the above structure, when the base 4 is placed on the ground and the shell 2 needs to be wrapped, the bottom of the left shell 2 and the right shell 2 are pressed against the ground. The bottom of the left shell 2 and the right shell 2 clamp the two sides of the base 4 and move towards the middle of the base 4. The front end of the snap-fit ​​block 24 first contacts the outer wall of the base 4 and gradually moves towards the middle. The inner arc surface of the snap-fit ​​block 24 gradually contacts the outer wall of the base 4, so that the front and rear sides of the inner end of the shell 2 are slightly opened to the front and rear sides under the pressure of the snap-fit ​​block 24. When the snap-fit ​​block 24 moves to the snap-fit ​​groove 41, the snap-fit ​​block 24 loses the pressure of the outer wall of the base 4. The snap-fit ​​block 24 is pushed into the snap-fit ​​groove 41 by the elasticity of the shell 2. At this time, the inner ends of the left shell 2 and the right shell 2 are connected and fixed in position with the base 4.

[0017] In this embodiment, a cover plate 1 is provided on the top of the housing 2. A third snap-fit ​​groove 11 is provided on the top of the cover plate 1, and the tops of the two C-shaped clamps are snapped into the third snap-fit ​​groove 11. A limiting groove 21 is provided on the top of the housing 2, and a limiting plate 12 with the same horizontal dimension as the limiting groove 21 and a height slightly less than the groove depth of the limiting groove 21 is fixed at the bottom of the cover plate 1. When the cover plate 1 covers the top of the housing 2, the limiting plate 12 is inserted into the limiting groove 21. The third snap-fit ​​groove 11 has the same function as the first snap-fit ​​groove 22 and the second snap-fit ​​groove 42, which is to limit the position of the C-shaped clamps. The cooperation between the limiting plate 12 and the limiting groove 21 makes the connection between the cover plate 1 and the top of the housing 2 more stable.

[0018] This invention places two containers 5 of a methane sensor in a base 4, which supports the containers 5. A housing 2 is installed around the base 4 and the containers 5, with the bottom of the housing 2 engaging with the base 4 to move the methane containers 5. The left and right parts of the housing 2 are fixedly connected by a fastening assembly 3. In use, first unscrew the bolts of the fastening assembly 3 and remove the two C-shaped clamps outwards. Then, simultaneously pull the two handles 23 of the same housing 2 to move the engaging blocks 24 out of the engaging slots 41 and towards both ends. After both housings 2 are completely disassembled, the base 4 and containers 5 are exposed. At this point, the top pipe of the flow meter 6 is connected to the methane sensor to be calibrated for calibration. Specifically, the container 5 containing compressed air is slowly opened. Switch 8, adjust the flow regulating valve 9, and control the compressed air to charge the methane sensor at a flow rate of 200L / min for air zeroing. Zero the sensor every three minutes until it is accurately zeroed. Close the switch 8 and flow regulating valve 9 of the container 5 containing compressed air. Then calibrate the methane sensor by opening the switch 8 of the container 5 containing compressed methane gas using the same zeroing method, and adjusting the flow regulating valve 9 to the same flow rate as above. After calibration, close the switch 8 and flow regulating valve 9 of the container 5 containing compressed methane gas. After calibration, disconnect the top pipe of the flow meter 6 from the methane sensor. Push the two housing parts 2 from both sides towards the middle so that the bottom of the housing 2 is engaged with the base 4 by the snap-fit ​​block 24, and then re-fix the fastening assembly 3.

[0019] The above description is only a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A calibration device for a mining methane sensor, comprising two containers, one for containing compressed air and the other for containing compressed methane gas, both containers being connected to a flow meter, the other end of which is connected to the methane sensor to be calibrated via a pipeline, characterized in that: The bottom of each of the two containers is provided with a base for placing the containers. The base and the containers are encased in a shell, which is divided into left and right parts. The bottom of the shell is snapped into the base, and the left and right parts of the shell are fixedly connected by a fastening assembly.

2. The calibration device for a mining methane sensor according to claim 1, characterized in that: The outer walls of both the left and right shells are provided with vertical first snap-fit ​​grooves, and the bottom of the base is provided with horizontal second snap-fit ​​grooves. The fastening assembly includes two opposing C-shaped clamps, which are snapped into the first and second snap-fit ​​grooves and fixedly connected at their inner ends.

3. The calibration device for a mining methane sensor according to claim 1, characterized in that: The bottom inner end of the housing is provided with a snap-fit ​​block, and the outer wall of the base is provided with a snap-fit ​​groove. The snap-fit ​​block is used to snap into the corresponding snap-fit ​​groove.

4. The calibration device for a mining methane sensor according to claim 3, characterized in that: The thickness of the snap-fit ​​block gradually decreases from the outside to the inside, the inner side of the snap-fit ​​block is an arc-shaped surface, and a handle is provided on the outer wall of the housing corresponding to the snap-fit ​​block position.

5. The calibration device for a mining methane sensor according to claim 2, characterized in that: The top of the housing is provided with a cover plate, and the top of the cover plate has a third snap-fit ​​groove. The tops of the two C-shaped clamps are snapped into the third snap-fit ​​groove. The top of the housing is provided with a limit groove, and the bottom of the cover plate is fixed with a limit plate with the same horizontal dimension as the limit groove. When the cover plate covers the top of the housing, the limit plate is inserted into the limit groove.

6. The calibration device for a mining methane sensor according to claim 1, characterized in that: Each of the containers is equipped with a switch on its top, and a flow regulating valve with a pressure reducer is installed at the other end of the switch.

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