A gas sensor calibration device and calibration method

Abstract

The present application relates to a kind of gas sensor calibration device and calibration method, calibration device includes the axial motion device of motion along middle axis in device box;Gas storage box conversion device carries out axial and rotary motion through middle axis, the installation slot of gas storage box is arranged at the front end of gas storage box conversion device, the rear end is equipped with the number of consistent curved surface structure with installation slot number;Push rod is fixed on axial motion device, the head of push rod acts on the curved surface structure, and pushes gas storage box conversion device rotary motion;Reset structure one end is abutted on gas storage box conversion device, the other end is abutted on the front end of device box;Jack is arranged at the gas intake of box device front end, and the head for opening the sealing element of gas storage box cover is arranged on jack;Gas intake is connected with the gas sensor to be calibrated by gas passage;The calibration method can complete feeding, sealing, film breaking, reset, angular displacement to the continuous action of next cycle, to effectively, conveniently and safely carry out gas sensor field calibration.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gas detection and monitoring, and particularly relates to a gas sensor calibration device and a calibration method. BACKGROUND

[0002] With the development of society and the improvement of safety awareness of infrastructure construction in China, some safety facilities such as various gas detection, monitoring, alarm and other sensor devices are more and more widely used. However, the gas sensor must be calibrated before use and after use for a period of time to ensure the reliability of its performance and the accuracy of measurement. The traditional calibration method is to take gas from a fixed volume standard container and then transmit it to the gas sensor for calibration, or to disassemble the gas sensor from the site and send it to the designated calibration site. The fixed volume standard container is heavy and has a certain pressure, so it is difficult to transport and the cost is high. It is difficult to achieve quantitative gas taking on site, and the calibration work is also more cumbersome and has certain safety hazards. In addition, the fixed volume standard container is not disposable and needs special storage, which undoubtedly increases the cost. If the gas sensor is disassembled on site and sent to the designated detection site, it may affect the function of the on-site system, and repeated disassembly and installation not only consumes time and effort, but also may cause irreparable damage to the reliability of the gas sensor. Therefore, a gas sensor calibration device is urgently needed to quickly, conveniently and quantitatively calibrate the gas sensor manually or automatically. SUMMARY

[0003] The purpose of the present application is to provide a gas sensor calibration device and a calibration method, which can quickly, conveniently and quantitatively calibrate the gas sensor manually or automatically.

[0004] In order to achieve the above purpose, the technical solution adopted by the present application is: a gas sensor calibration device, comprising an axial motion device, the axial motion device moves axially in the box body device along the central axis;

[0005] A gas storage box conversion device, which moves axially and rotates through the central axis, is provided with a mounting groove at the front end to accommodate the gas storage box, and the rear end of the gas storage box conversion device is provided with a number of curved surface structures consistent with the number of mounting grooves;

[0006] A push rod is fixed on the axial motion device, and the head of the push rod acts on the curved surface structure to drive the gas storage box conversion device to rotate;

[0007] A reset structure, which is an elastic body, abuts against the gas storage box conversion device at one end and abuts against the front end of the box body device at the other end;

[0008] A push rod is arranged at the gas taking port at the front end of the box device, and a column head for pushing open the sealing element of the box cover of the gas storage box is arranged on the push rod.

[0009] The gas taking port is connected with the gas sensor to be calibrated through a gas channel.

[0010] The gas storage box conversion device is installed on the middle shaft through a linear bearing.

[0011] The reset structure is a spring.

[0012] The power source of the axial movement device is a traction electromagnet.

[0013] A check structure is arranged in the gas taking port or the gas channel, and the check structure allows the standard gas to flow to the gas sensor.

[0014] The check structure is a one-way valve.

[0015] A sealing rubber gasket is further arranged around the gas storage box, and the sealing rubber gasket is used to close the edge of the gas taking port when the gas storage box and the gas taking port are docked.

[0016] A centering device is further arranged on the inner wall of the box device, and the centering device comprises a centering rod and a rolling body arranged at the end of the centering rod; a plurality of grooves are arranged at the rear part of the circumferential surface of the gas storage box conversion device, and the number of the grooves is consistent with the number of the installation grooves for installing the gas storage boxes.

[0017] The rolling body is a deep groove ball bearing.

[0018] The application further provides a gas sensor calibration method, and the method is performed by using the gas sensor calibration device and comprises the following steps.

[0019] In step one, a plurality of gas storage boxes storing standard gas are installed in the installation grooves of the gas storage box conversion device, the gas storage box conversion device is in the initial position under the reaction force of the reset structure, the axial movement device is in the initial position, and the centering device is in the groove of the gas storage box conversion device, so that the highest point position of the curved surface structure on the gas storage box conversion device is aligned with the column head of the push rod;

[0020] In step two, the axial movement device moves forward along the middle shaft, the push rod pushes the gas storage box conversion device to move forward along the middle shaft, when the centering device leaves the groove, the push rod acts on the curved surface structure to make the gas storage box conversion device rotate while moving forward, so that the gas storage box to be taken gas is adjusted to the position aligned with the push rod, the sealing element of the gas storage box is broken by the push rod, at the same time, the sealing rubber gasket around the gas storage box seals the gas taking port, the standard gas in the gas storage box flows out and enters the gas sensor through the gas taking port and the gas channel, and the calibration of the gas sensor is completed.

[0021] Step three, after calibration, the axial motion device is reversed to the initial position, the gas storage box conversion device is reset by the reaction force of the reset structure, when the gas storage box conversion device retreats to the position of the alignment device, under the rolling action of the rolling body on the alignment device, the gas storage box conversion device rotates while retreating, the alignment device rolls into the groove of the gas storage box conversion device, and the gas storage box conversion device is rotated to the position where the push rod is aligned with the highest point of the curved surface structure, at this time, the gas storage box conversion device retreats to the initial position, and is ready for the next gas delivery for gas sensor calibration.

[0022] The gas sensor calibration device provided by the application can effectively replace the fixed volume standard container gas taking mode, thereby avoiding the dangerous factors caused by manual opening of the pressure container, and can perform gas sensor calibration in a timed and quantitative manner, can provide online remote operation, and can also be operated manually on site; the gas sensor calibration device can also effectively replace the on-site disassembly of the gas sensor, thereby avoiding the damage to the reliability of the gas sensor caused by frequent disassembly, and ensuring the reliable operation of the gas sensor.

[0023] The gas storage box conversion device for installing the gas storage box rotates and moves axially under the action of the axial motion device, the push rod and the reset structure, can complete the continuous actions of feeding, sealing, film breaking, resetting and angular displacement to the next cycle, and can effectively, conveniently and safely perform on-site calibration of the gas sensor. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 The initial state structure diagram of the gas sensor calibration device described in the application is shown in the figure.

[0026] Figure 2 The state diagram of the gas sensor calibration device described in the application is shown in the figure.

[0027] Figure 3 The structure diagram of the gas sensor calibration device described in the application is shown in the figure.

[0028] Figure 4 The position diagram of the alignment rod in the reset process of the gas sensor calibration device described in the application is shown in the figure.

[0029] Figure 5Positioning rod position diagram after resetting of the gas sensor calibration device of the present application;

[0030] Figure 6 Distribution diagram of the gas storage box in the gas sensor calibration device of the present application;

[0031] Marked in the figure: 1 - central shaft, 2 - reset structure, 3 - linear bearing, 4 - device front cover, 5 - reverse stopping structure, 6 - ejector rod, 7 - gas storage box, 701 - sealing sheet, 8 - sealing rubber pad, 9 - gas storage box conversion device, 901 - groove, 10 - device shell, 11 - positioning device, 12 - push rod, 13 - axial movement device, 14 - curved surface structure, 15 - gas sensor, 16 - standard gas. DETAILED DESCRIPTION

[0032] The present application will be further described in detail below in combination with the drawings and examples, but not as any limitation on the application.

[0033] Example 1: see Figure 1 、 Figure 2 、 Figure 3 The gas sensor calibration device provided in the embodiment is suitable for cooperating with a gas sensor to calibrate the gas sensor, and comprises a central shaft 1, a reset structure 2, a device front cover 4, a reverse stopping structure 5, an ejector rod 6, a gas storage box 7, a sealing rubber pad 8, a gas storage box conversion device 9, a device shell 10, a positioning device, a push rod 12 and an axial movement device 13.

[0034] The device shell 10 and the device front cover 4 are assembled into a box body device, the device front cover 4 is connected to the mouth of the device shell 10, the central shaft 1 is located in the box body device, one end of the central shaft 1 is supported on the device front cover 4, and the other end is supported on the bottom surface of the device shell 10. The gas storage box conversion device 9 is a disc-shaped structure and is arranged on the central shaft 1 through a linear bearing 3, the linear bearing 3 can slide and rotate on the central shaft 1, thereby driving the gas storage box conversion device 9 to move forward and backward and rotate. The axial movement device 13 for pushing the gas storage box conversion device 9 to move axially forward and backward is also installed on the central shaft 1, the axial movement device 13 is located between the bottom surface of the device shell 10 and the gas storage box conversion device 9, the front end of the axial movement device 13 is provided with a push rod 12, the push rod 12 acts on the gas storage box conversion device 9, and the gas storage box conversion device 9 is realized to move forward. The reset structure 2 is also arranged on the central shaft 1, one end of the reset structure 2 abuts against the linear bearing 3, and the other end abuts against the device front cover 4, after the gas storage box conversion device 9 moves forward, the reset structure 2 is compressed to generate an elastic force, when the axial movement device 13 moves backward, the reset structure 2 releases the elastic force to push the linear bearing 3 to drive the gas storage box conversion device 9 to move backward and reset.

[0035] Alternatively, the reset structure 2 can adopt a spring or a flexible sleeve.

[0036] Alternatively, the axial movement device power source is a traction electromagnet, which is simple in structure, reliable in operation and cost-effective.

[0037] The device front cover 4 is provided with a gas taking port, which extends outwardly and is connected to the gas sensor 15 to be calibrated through a gas channel. A check structure 5 is arranged in the gas taking port or the gas channel, which allows the standard gas to flow to the gas sensor 15 and prevents the residual gas in the gas sensor 15 or the gas channel from flowing back into the box device. Specifically, the check structure 5 can be a one-way valve.

[0038] As an embodiment, the check structure 5 is a light ball and a spring. The light ball is arranged in the gas taking port extension, and the light ball is connected to one end of the spring, and the other end of the spring is fixed to the inner wall of the gas channel. The inner wall of the gas taking port extension is a tapered surface, the small-diameter end of which is arranged on the device front cover 4, and the large-diameter end thereof faces the gas channel. The standard gas pushes the light ball to move towards the gas sensor after flowing out of the gas taking port, and the standard gas flows through the gap around the light ball and enters the gas sensor 15 through the gas channel.

[0039] The standard gas for calibrating or standardizing the gas sensor is stored in the gas storage box 7, which is installed in the installation slot of the gas storage box switching device 9. The gas storage box switching device 9 is provided with a plurality of installation slots around the center, and each installation slot is installed with a gas storage box 7. The box cover of the gas storage box 7 is provided with a seal piece that is easy to fall off. By means of external force, the seal piece can be pushed off from the box cover, and the standard gas in the gas storage box 7 flows out of the opening of the box cover and enters the gas sensor through the gas channel. The ejector rod 6 for pushing the seal piece is fixed to the device front cover 4, specifically at the position of the gas taking port. When the gas storage box switching device 9 moves forward along the central axis to the end of the stroke, the head of the ejector rod 6 will push the seal piece on the box cover of the gas storage box 7 to break and fall off, and the standard gas will flow out.

[0040] In order to ensure that the standard gas flows into the gas sensor 15 through the check structure 5 and the gas channel, a sealing rubber 8 is arranged around the box cover of the gas storage box 7. When the ejector rod 6 pushes the seal piece on the box cover of the gas storage box 7 to break, the sealing rubber 8 is pressed around the gas taking port, avoiding the overflow of the standard gas, and the standard gas can only enter the gas taking port and the gas channel.

[0041] A plurality of gas storage boxes 7 are installed in the gas storage box switching device 9, so that after gas is taken from one gas storage box 7, another gas storage box 7 can be automatically adjusted to the position ready for the next time gas is taken. A plurality of curved surface structures 14 are arranged at the rear of the gas storage box switching device 9, the curved surface of the curved surface structure 14 has a highest point and a lowest point, when the axial movement device 13 pushes the push rod 12 to move forward, the stud on the push rod 12 acts on the highest point of the curved surface structure 14 and moves to the lowest point, so that the gas storage box switching device 9 can be driven to rotate a certain angle while being pushed forward, and the next gas storage box 7 is rotated to the position required to be aligned with the gas taking port.

[0042] In order to ensure that the highest point of the curved surface structure on the gas storage box switching device 9 is aligned with the stud on the push rod 12 during the resetting process, a positioning device 11 is also provided. The positioning device 11 includes a positioning rod and a rolling body installed at the end of the positioning rod, the positioning rod is fixed on the inner wall of the device housing 10, and the rolling body can freely rotate on the positioning rod. A plurality of grooves 901 are arranged at the rear of the circumferential surface of the gas storage box switching device 9, the number of the grooves 901 is consistent with the number of the installation slots for installing the gas storage boxes 7, when the gas storage box switching device 9 is retracted to the position of the positioning device 11, the positioning device 11 slides into the groove 901 on the gas storage box switching device 9, thereby rotating the gas storage box switching device 9 to the position where the highest point of the curved surface structure 14 is aligned with the push rod 12 on the axial movement device 13, so that the next time the calibration is performed, the top rod 6 is aligned with the next gas storage box 7.

[0043] As an option, the rolling body is a deep groove ball bearing.

[0044] Embodiment 2: The calibration method proposed in the present application uses the gas sensor calibration device described in Embodiment 1, and the method is described in detail below.

[0045] First, as shown in Figure 6 , install the gas storage box storing standard gas in the installation slot of the gas storage box switching device 9, under the reaction force of the resetting structure, in the initial position as shown in Figure 1 , at this time, the axial movement device 13 drives the push rod 12 to the starting position, and the positioning device 11 is in the groove 901 of the gas storage box switching device 9, so that the highest point of the curved surface structure 14 on the gas storage box switching device 9 is aligned with the stud of the push rod 12.

[0046] Second, as shown in Figure 2As shown, when the axial movement device 13 is operated to move axially forward, the push rod 12 on the axial movement device 13 pushes the gas cartridge conversion device 9 to move axially forward under the action of the linear bearing 3, and when the alignment device 11 leaves the groove of the gas cartridge conversion device 9, the push rod 12 pushes the curved surface structure 14 on the gas cartridge conversion device 9 to convert into a fixed-angle rotary displacement under the action of the linear bearing 3, so that the first gas cartridge 7 is adjusted to a position aligned with the ejector rod 6, so that the ejector rod 6 on the device front cover 4 breaks the film of the sealing element of the first gas cartridge 7 and opens the sealing element; at the same time, the sealing gasket 8 on the gas cartridge conversion device 9 seals the gas outlet around the device front cover 4, so that the standard gas can only enter the gas sensor through the non-return structure 5 of the gas outlet after gushing out, thereby completing the calibration of the gas sensor.

[0047] Finally, as shown in Figure 3 , when the calibration is completed, the non-return structure 5 is closed to prevent the residual gas in the channel and the sensor from reversing the calibration device. At the same time, the axial movement device 13 is reversely moved to the starting position, and the gas cartridge conversion device 9 is retreated to the starting position under the reaction force of the reset structure 2 on the device front cover 4; the process of retreating the gas cartridge conversion device 9 to the initial position can also be referred to Figure 4 , as shown, when the gas cartridge conversion device 9 retreats to the position of the alignment device 11, under the rolling action of the rolling body on the alignment device 11, the gas cartridge conversion device 9 rotates during the retreat movement, until the gas cartridge conversion device 9 retreats to the starting position, as shown in Figure 5 , the alignment device 11 rolls into the groove 901 of the gas cartridge conversion device 9, thereby rotating the gas cartridge conversion device 9 to the highest point of the curved surface structure 14 aligned with the push rod 12 on the axial movement device 13, thereby ensuring that the ejector rod 6 is aligned with the next gas cartridge 7 during the next calibration.

[0048] Through the above process, as shown in Figure 6 , a plurality of gas cartridges 7 installed on the gas cartridge conversion device 9 can be converted from the first gas cartridge to the second gas cartridge, and then from the second gas cartridge to the third gas cartridge, and so on, so as to complete the delivery of the standard gas for the calibration of the gas sensor.

[0049] In summary, the gas sensor calibration device provided by the embodiments of the present disclosure can effectively replace the gas taking mode of the fixed-volume standard container, thereby avoiding the dangerous factors caused by manually opening the pressure container, and can perform automatic or manual calibration of the gas sensor at a fixed time and quantity, can provide online remote operation, or can be operated on site with a handheld device; the gas sensor calibration device can also effectively replace the on-site disassembly mode of the gas sensor, thereby avoiding the damage to the reliability of the gas sensor caused by frequent disassembly, and thereby ensuring the reliable operation of the gas sensor.

[0050] The above examples are only used to illustrate the technical solutions of the present application but not to limit it, and those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced equivalently with reference to the above examples, and any modification or equivalent replacement which does not depart from the spirit and scope of the present application is within the protection scope of the claims of the application to be granted.

Claims

1. A gas sensor calibration device, characterized in that: Includes an axial motion device, which moves axially within the housing device along the central axis; The gas storage box conversion device passes through the central axis and performs axial and rotational movements. The front end of the gas storage box conversion device is provided with an installation groove to accommodate the gas storage box, and the rear end of the gas storage box conversion device is provided with a number of curved surface structures that are the same as the number of installation grooves. A push rod is fixed to the axial motion device. The column head on the push rod acts on the curved structure to drive the gas storage box conversion device to rotate. The reset structure is an elastic body, one end of which abuts against the gas storage box conversion device, and the other end abuts against the front end of the box device. A push rod is provided at the air intake port at the front end of the box body device, and a column head is provided on the push rod for opening the sealing part of the air storage box cover; The gas intake port is connected to the gas sensor to be calibrated via a gas channel.

2. The gas sensor calibration device according to claim 1, characterized in that: The gas storage box conversion device is mounted on the central shaft via a linear bearing.

3. The gas sensor calibration device according to claim 1, characterized in that: The reset structure is a spring.

4. The gas sensor calibration device according to claim 1, characterized in that: The power source for the axial motion device is a traction electromagnet.

5. A gas sensor calibration device according to claim 1, characterized in that: The gas inlet or gas channel is equipped with a backflow prevention structure, which allows standard gas to flow to the gas sensor.

6. A gas sensor calibration device according to claim 5, characterized in that: The check valve is a one-way valve.

7. A gas sensor calibration device according to claim 1, characterized in that: A sealing gasket is also installed around the gas storage box. When the gas storage box and the gas intake port are connected, the sealing gasket is used to seal the edge of the gas intake port.

8. A gas sensor calibration device according to claim 7, characterized in that: An alignment device is also provided on the inner wall of the box device. The alignment device includes an alignment rod and a rolling element installed at the end of the alignment rod. Multiple grooves are provided on the rear part of the circumferential surface of the gas storage box conversion device. The number of grooves is the same as the number of mounting slots for installing the gas storage box.

9. A gas sensor calibration device according to claim 8, characterized in that: The rolling element is a deep groove ball bearing.

10. A gas sensor calibration method, wherein the method utilizes the gas sensor calibration apparatus of claim 8, characterized in that, Includes the following steps: Step 1: Install multiple gas storage boxes containing standard gas in the mounting slot of the gas storage box conversion device. Under the reaction force of the reset structure, the gas storage box conversion device is in the initial position, the axial motion device is in the initial position, and the alignment device is in the groove of the gas storage box conversion device, so that the highest point of the curved surface structure on the gas storage box conversion device is aligned with the column head of the push rod. Step two: The axial motion device moves forward along the central axis, and the push rod pushes the gas storage box conversion device forward along the central axis. When the alignment device leaves the groove, the push rod acts on the curved structure, causing the gas storage box conversion device to rotate while moving forward, so that the gas storage box to be taken is adjusted to the position aligned with the top rod. The top rod breaks the seal of the gas storage box. At the same time, the sealing gasket around the gas storage box seals the area around the gas intake port. The standard gas in the gas storage box rushes out and enters the gas sensor through the gas intake port and gas channel to complete the calibration of the gas sensor. Step 3: After calibration, the axial motion device moves in the opposite direction to the initial position. The gas storage box conversion device is pushed back to its original position by the reaction force of the reset structure. When the gas storage box conversion device moves back to the position of the alignment device, the gas storage box conversion device rotates simultaneously during the backward movement under the rolling action of the rolling body on the alignment device. The alignment device rolls into the groove of the gas storage box conversion device, rotating the gas storage box conversion device until the push rod is aligned with the highest point of the curved structure. At this time, the gas storage box conversion device moves back to the initial position, ready for the gas delivery for the next gas sensor calibration.

Images