Automatic calibration device, calibration robot and calibration method

Abstract

The invention relates to the technical field of sensor calibration, in particular to an automatic calibration device, a calibration robot and a calibration method.The automatic calibration device comprises a detection module used for outputting gas to a sensor to be detected for detection; the control module is electrically connected with the detection module so as to control the detection module; the monitoring module is electrically connected with the control module, so that the control module outputs data to the monitoring module; and the gas supply module is connected with the detection module so as to supply detection gas to the detection module. Through the cooperation of the detection module, the control module and the gas supply module, automatic calibration of the sensor can be realized, the operation steps of sensor calibration are simplified, the complexity of personnel operation is reduced, and meanwhile, through the cooperation of the monitoring module and the control module, the quality of sensor calibration and the identifiability of abnormal operation are improved; in addition, the intensity of field adjustment is reduced, and the stability and intelligence of the product are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor calibration, and in particular to an automatic calibration device, a calibration robot and a calibration method. Background Art

[0002] Gas sensors are an important component of coal mine safety monitoring systems. The accuracy and reliability of their measurements directly affect whether coal mines can operate safely and reliably, and play a vital role in the safe production of coal mines. Due to the harsh underground environment of coal mines and the complex gas environment, gas sensors are very prone to measurement offsets, and gas sensors in use need to be calibrated regularly. Coal mine underground sensors need to be calibrated regularly. Failure to calibrate or abnormal calibration will cause inaccurate detection, false alarms and other problems, seriously affecting coal mine production and maintenance costs.

[0003] Currently, common calibration devices include air bags and gas cylinders. The calibration work is mainly performed manually by staff. The whole process is cumbersome, labor-intensive and time-consuming. In the traditional method, calibration personnel often replace their posts, fail to mark, miss labels, make wrong labels, etc. This method can only regulate sensor calibration from a management perspective, and in actual situations, it is closely related to the sense of responsibility and experience of the calibration personnel. This leads to frequent calibration data errors in sensor calibration, which can easily cause system false alarms or power outages during calibration, and is not conducive to maintenance and management.

[0004] The Chinese patent application number 202211080360.8 proposes a method for zero point calibration and gas calibration of a gas sensor. However, the following deficiencies exist:

[0005] 1. The traditional calibration device has two built-in gas cylinders, namely the standard gas cylinder and the test gas cylinder. During calibration, the maintenance personnel connect the standard gas cylinder and the test gas cylinder respectively to achieve calibration. However, this calibration method is more troublesome, the calibration is highly complicated, and the workload of the maintenance personnel is large.

[0006] 2. During actual calibration, the consumption of calibration gas is much greater than that of zero gas, and zero gas is often not completely consumed. The calibration gas directly determines the number of sensors that can be calibrated in a single calibration operation underground, and there is also a waste problem in the gas in the zero gas cylinder.

[0007] 3. Traditional calibration devices cannot correct environmental parameters and it is difficult to correct gas concentrations.

[0008] 4. The existing wired transmission mining sensors underground are equipped with aerial plugs, but they can only provide power supply, upload and send data to the monitoring system, and do not have wireless functions. Data cannot interact with other devices, and automatic calibration cannot be achieved. Summary of the invention

[0009] The technical problem to be solved by the present invention is: in order to solve the technical problems in the prior art, the present invention provides an automatic calibration device, a calibration robot and a calibration method, which can realize automatic calibration of sensors and have the function of identifying abnormal operations of sensors. The method simplifies the operating steps of sensor calibration, reduces the complexity of personnel operation, and improves the quality of sensor calibration and the identification of abnormal operations.

[0010] The technical solution adopted by the present invention to solve its technical problems is: an automatic calibration device, including a detection module, used to output gas to a sensor to be tested for detection; a control module, the control module is electrically connected to the detection module to control the detection module; a monitoring module, the monitoring module is electrically connected to the control module so that the control module outputs data to the monitoring module; and a gas supply module, the gas supply module is connected to the detection module to supply detection gas to the detection module.

[0011] Furthermore, the gas supply module includes a gas cylinder assembly, and the detection module includes a flow control assembly and a gas concentration sensor. The gas cylinder assembly is connected to the flow control assembly and is suitable for outputting zero point calibration gas and linear calibration gas to the flow control assembly. The flow control assembly is suitable for mixing the two gases output by the gas cylinder assembly and controlling the mixing ratio and on-off of the mixed gas. The gas sensor is connected to the flow control assembly to facilitate the detection of gas concentration.

[0012] Through the above technical solution, the gas concentration is detected by using a gas concentration sensor to ensure the consistency of the gas concentration of the output gas. The gas concentration is corrected through the gas concentration sensor to improve the accuracy of the calibration.

[0013] Furthermore, the control module includes an environmental sensor suitable for detecting the external environment; a positioning module suitable for position detection; a connection module suitable for connecting to the sensor to be tested for data transmission; the connection module includes a wireless module, a wired module and a camera; the wired module includes a data repeater, which is connected to the sensor to be tested, and the data repeater also has a calibration connection port and a system connection port. The calibration connection port is used to connect to an automatic calibration device, and the system connection port is used to connect to a security monitoring system.

[0014] Through the above technical solution, environmental parameters are obtained through environmental sensors to correct the environmental parameters.

[0015] Furthermore, the monitoring module is electrically connected to the safety monitoring system to upload the calibration process information to the safety monitoring system in real time. The safety monitoring system automatically generates a multi-dimensional data packet containing "ventilation time-gas flow-gas concentration-sensor output value", and compares it with historical ventilation data to realize fault diagnosis and life analysis of the sensor detection element.

[0016] Through the above technical solution, the calibration process information is collected by the monitoring module and stored in the safety monitoring system, which is convenient for comparison with historical data and further facilitates the health effect evaluation of the sensor.

[0017] A calibration robot comprises a patrol robot, wherein the patrol robot is suitable for moving the above-mentioned automatic calibration device.

[0018] A calibration method, based on the above automatic calibration device, comprises the following steps:

[0019] S1. The calibration device is turned on, and the operator logs in and takes a photo to ensure the operator's identity;

[0020] S2. Unscrew the dust cover of the sensor to be tested, check whether the sensor to be tested is blocked and whether maintenance is required, and take photos and records. The calibration device automatically determines whether maintenance is required. After ensuring that the sensor is not blocked, perform the following steps;

[0021] S3, establishing a data connection between the calibration device and the sensor to be tested;

[0022] S4. The calibration device obtains the self-diagnosis information of the health status of the sensor. If there is a problem that affects the normal operation of the sensor, such as a failure in the gas detection function of the sensor or an abnormality in the communication function between the sensor and the system, the calibration of the sensor is stopped;

[0023] S5. Connect the vent cover to the air inlet of the sensor to be tested, and use the remote control to start the calibration process of the sensor to be tested. The start operation can also be started by the start button on the calibration device, and the calibration device automatically completes the calibration related operations;

[0024] S6. Complete calibration.

[0025] Further, in S5, the calibration operation includes:

[0026] S51, enter the online calibration state;

[0027] S52, introduce zero gas at a specified flow rate;

[0028] S53, adjust the sensor zero point;

[0029] S54, introducing standard gas (mixture of zero gas and standard gas) with alarm value concentration;

[0030] S55, test the alarm point of the sensor (whether the sensor has sound and light alarm);

[0031] S56, introduce standard gas (mixture of zero gas and standard gas) with the concentration at the power-off point;

[0032] S57, testing the power-off point of the sensor (whether the associated equipment is powered off);

[0033] S58, introduce standard gas at a specified flow rate;

[0034] S59, timing of standard gas flow;

[0035] S510, adjust sensor linearity;

[0036] S511, introduce standard gas (mixture of zero gas and standard gas) of the concentration of the recharge point;

[0037] S512, test the sensor power-on point (whether the associated device is powered on);

[0038] S513, exit the calibration state.

[0039] Furthermore, in S2, if it is necessary to test the filter blockage of the sensor, the zero gas is opened at the default opening, and the filter blockage condition can be obtained by judging the flow value output by the flow control component.

[0040] Further, in S5, if it is necessary to test the response time of the sensor, calibration gas is passed to the sensor, and the response time is the difference between the time when the sensor reaches 90% of the calibration gas sample concentration and the time when the calibration gas sample is introduced.

[0041] Furthermore, in S5, when the calibration device completes the ventilation calibration operation, the calibration-related data is uploaded in real time and a calibration record is formed.

[0042] Furthermore, in S5, the calibration device detects and identifies the working condition information in the environment in real time, and transmits the detection information to the sensor to be tested. The sensor to be tested uses this information to compare and correct the information, and further inverts its own position information, compares it with the historical position information, and performs position compliance judgment.

[0043] The beneficial effects of the present invention are:

[0044] 1. Automatic calibration of sensors can be realized, and the abnormal operation of sensors, the health status of sensors, and the abnormal operation of calibration devices can be identified. This method simplifies the operation steps of sensor calibration, reduces the complexity of personnel operation, and improves the quality of sensor calibration and the identification of abnormal operation. This method reduces the intensity of on-site adjustment and improves the stability and intelligence of the product.

[0045] 2. The traditional method only provides zero gas and calibration gas for the sensor. This method further provides information such as temperature, humidity, pressure, etc. in the environment through the environmental sensor. The sensor can not only correct the gas concentration but also correct the environmental parameters.

[0046] 3. The automatic calibration device can be used to achieve automatic mixing of zero gas and standard gas, and then output different specified concentrations of gas required for calibration. It can realize multi-point, full-coverage multi-point calibration with higher calibration accuracy. At the same time, it can ensure that there are no omissions in the calibration process, ensure that the safety monitoring system obtains all data, and improve the compliance and quality of calibration.

[0047] 4. The automatic calibration device can detect probe blockage and remind calibration personnel to replace the filter in time to ensure that the sensor works normally under natural diffusion and improve detection accuracy.

[0048] 5. Based on the solution of this application, the number of calibrable sensors of the calibration device can be greatly increased on the basis of the same pressure and volume gas cylinders, thereby reducing gas waste and the workload of gas cylinder maintenance.

[0049] 6. Through the setting of the data repeater, when the maintenance personnel are performing maintenance, they only need to connect the automatic calibration device to the calibration connection port through a cable to realize the interaction between the automatic calibration device and the sensor to be tested, so that the sensor to be tested automatically enters the calibration state, thereby realizing automatic calibration, and is not affected by signal interference or the environment, and the calibration efficiency is higher; at the same time, after the automatic calibration device is connected to the calibration connection port, the automatic calibration device can also be connected to the security monitoring system through the data repeater. Compared with the wireless module 76, the communication signal of this method is more stable;

[0050] 7. Through the setting of data repeaters, there is no need to replace the existing wired transmission sensors in the well. The existing sensors can be directly modified to support automatic calibration of the automatic calibration device. The solution is simple, easy to implement, and has strong universality. It greatly expands the application scope of the automatic calibration device and reduces the application cost of the automatic calibration device. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0052] Figure 1 It is a schematic diagram of the overall structure of the automatic calibration device in the present invention.

[0053] Figure 2 It is a structural schematic diagram of the flow control component of the present invention using an electromagnetic proportional valve and a flow sensor.

[0054] Figure 3It is a schematic diagram showing the relationship between the output flow rate and the driving current of the electromagnetic proportional valve in the present invention.

[0055] Figure 4 It is a structural schematic diagram of the flow control component using an electromagnetic switch valve in the present invention.

[0056] Figure 5 It is a schematic diagram of a connection module in the present invention.

[0057] Figure 6 It is a communication schematic diagram of the data repeater in the present invention when the sensor to be tested is in a calibration state.

[0058] Figure 7 It is a communication schematic diagram of the data repeater in the present invention when the sensor to be tested is in a non-calibrated state.

[0059] Figure 8 It is a flow chart showing the calibration method in the present invention.

[0060] Fig. 9 It is a structural schematic diagram showing the front appearance of the calibration tool box in the present invention.

[0061] Fig.10 It is a structural schematic diagram showing the back side of the calibration tool box in the present invention.

[0062] Fig.11 It is a schematic diagram of the adjustment knob in the present invention.

[0063] Fig.12 It is a schematic diagram of a gas cylinder assembly and a flow control assembly in the present invention.

[0064] Fig.13 It is a schematic diagram showing the front side of the cover plate in the present invention.

[0065] Fig.14 It is a schematic diagram showing the back side of the cover plate in the present invention.

[0066] Fig.15 It is a schematic diagram of a zero gas cylinder in the present invention.

[0067] Fig.16 It is a schematic diagram of a flow control component in the present invention.

[0068] Fig.17 It is a schematic diagram showing the overall front side of the filling machine in the present invention.

[0069] Fig.18 It is a schematic diagram showing the overall back side of the filling machine in the present invention.

[0070] Fig.19 It is a schematic diagram of the filling machine in the present invention that embodies the principle of inflation and vacuuming.

[0071] In the figure: 1. Main box; 11. Upper cover; 111. Lock; 12. Liner; 13. Cover plate; 131. Zero gas vacuum joint; 132. Standard gas vacuum joint; 133. Zero gas three-way valve; 134. Standard gas three-way valve; 135. Inflating hole; 136. Vacuum hole; 14. Gas outlet; 15. Square observation window; 151. Round observation window; 152. Double shoulder strap mounting buckle; 153. Lifting ring; 154. Handle; 2. Gas cylinder assembly; 2 1. Gas cylinder 1; 22. Gas cylinder 2; 23. Pressure reducing valve 1; 231. Adjustment knob; 24. Ejector valve; 25. Zero gas charging connector; 26. Zero gas outlet connector; 27. Pressure reducing valve 2; 3. Flow control assembly; 31. Zero gas interface; 32. Standard gas interface; 33. Outlet interface; 34. Zero gas solenoid proportional valve; 35. Standard gas solenoid proportional valve; 36. Zero gas flow sensor; 37. Standard gas flow sensor; 38. Zero gas solenoid switch valve; 3 9. Standard gas solenoid switch valve; 391. Total solenoid proportional valve; 392. Total flow sensor; 4. Filling cabinet; 41. Vacuum pump; 411. First pressure sensor; 412. First solenoid valve; 42. Booster pump; 421. Second pressure sensor; 422. Pressure relief valve; 423. Second solenoid valve; 424. Third solenoid valve; 425. Air filter; 426. Standard gas cylinder; 427. Output pressure reducing valve; 428. Fourth solenoid Valve; 43, inflation pipeline; 44, vacuum pipeline; 45, control panel; 46, protective observation window; 6, gas concentration sensor; 61, one-way valve; 62, filter; 7, control module; 71, processor; 72, positioning module; 73, display screen; 74, camera; 75, alarm; 76, wireless module; 761, data repeater; 77, power sensor; 78, environmental sensor; 79, battery assembly; 8, sensor to be tested. DETAILED DESCRIPTION

[0072] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0073] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] The invention discloses an automatic calibration device, a calibration robot and a calibration method.

[0075] Reference Figure 1 , an automatic calibration device, including a gas supply module, a control module 7, a detection module and a monitoring module, the gas supply module includes a gas cylinder assembly 2, the detection module includes a flow control assembly 3 and a gas sensor 6, the gas cylinder assembly 2 provides the gas source required for calibration, generally provides two gases, one is a zero point calibration gas, and the other is a linear calibration gas. The gas cylinder assembly 2 includes a gas cylinder 1 21, a gas cylinder 2 22, a pressure gauge 1 and a pressure reducing valve 1 23 arranged at the outlet of the gas cylinder 1 21 in sequence, and a pressure gauge 2 and a pressure reducing valve 2 27 arranged at the outlet of the gas cylinder 2 22 in sequence. The pressure gauge is used to indicate the residual pressure of the gas in the gas cylinder. The pressure reducing valve 1 23 and the pressure reducing valve 2 27 can use a two-stage constant pressure pressure reducing valve to reduce the pressure at the outlet of the gas cylinder 1 21 or the gas cylinder 2 22, and output a constant gas pressure. In this embodiment, the output gas pressure is limited to the range of 0.15-0.2MPa, which is convenient for the use of the back-end components. The gas sensor 6 is convenient for detecting the concentration of the gas. The linear calibration gas can be loaded with mixed gas, such as methane and carbon monoxide gas, so that the methane sensor and carbon monoxide sensor can be linearly calibrated with one bottle of gas. Pure nitrogen or clean air is generally used to calibrate the methane sensor and carbon monoxide sensor. The materials of the gas cylinder are mainly aluminum alloy and carbon fiber.

[0076] It should be noted that, in this embodiment, the gas cylinder 1 21 outputs zero point calibration gas, namely, zero gas, and the gas cylinder 2 22 outputs linear calibration gas, namely, standard gas.

[0077] Reference Figure 2 The flow control component 3 includes a zero gas electromagnetic proportional valve 34, a standard gas electromagnetic proportional valve 35, a zero gas flow sensor 36 and a standard gas flow sensor 37. One end of the zero gas electromagnetic proportional valve 34 is connected to the pressure reducing valve 1 23, and the other end is connected to the zero gas flow sensor 36. The zero gas flow sensor 36 is connected to the gas concentration sensor 6. One end of the standard gas electromagnetic proportional valve 35 is connected to the pressure reducing valve 2 27, and the other end is connected to the standard gas flow sensor 37. The standard gas flow sensor 37 is connected to the gas concentration sensor 6. The zero gas and standard gas are accurately output by the zero gas flow controller, the standard gas flow controller, the zero gas electromagnetic proportional valve 34 and the standard gas electromagnetic proportional valve 35, and the gas concentration is monitored by the gas concentration sensor 6. A dual-path flow control unit is used to realize the automatic setting and self-check of the gas concentration of the two gas paths, thereby improving the accuracy of calibration.

[0078] Specifically, both the pressure reducing valve 1 23 and the pressure reducing valve 2 27 can be constant pressure reducing valves to ensure that the outlet pressure of the zero gas cylinder and the standard gas cylinder is constant, and the outlet pressure will not be affected by the reduction of the cylinder pressure. When the cylinder pressure is reduced to the outlet pressure, the deflation stops. In this embodiment, the outlet pressure is set to 0.15MPa.

[0079] Use electromagnetic proportional valve as flow proportion control unit, refer to Figure 3 , when the pressure difference between the inlet and outlet of the electromagnetic proportional valve is constant, its driving current is proportional to the output flow rate. The electromagnetic proportional valve is driven by a PWM pulse signal. By controlling the duty cycle of the PWM pulse, the average driving current of the proportional valve port can be controlled, thereby achieving the purpose of controlling the flow rate.

[0080] A flow sensor is used as a flow detection unit. In this embodiment, the flow sensor is equipped with a temperature and pressure compensation module, which outputs a 0-VDC signal to achieve accurate measurement and digital feedback of mass flow. Before use, the flow sensor can be calibrated by a float flowmeter to achieve accurate measurement of volume flow. During operation, the flow sensor feeds back the flow measurement data to the control module 7, which adjusts the PWM pulse of the solenoid valve according to the PID control algorithm to achieve automatic control of the flow. In this embodiment, the control module 7 can use a single-chip microcomputer.

[0081] The gas concentration sensor 6 serves as a gas concentration detection unit. The measurement accuracy and stability of the gas concentration sensor 6 are much higher than those of the calibrated sensor. A calibration air inlet can be reserved on the calibrated sensor so that it can be calibrated regularly using standard gas. The gas concentration sensor 6 is used to measure the actual gas concentration after the zero gas and the standard gas are mixed, and the concentration measurement data is fed back to the control module 7. The control module 7 completes the linear adjustment of the calibrated sensor according to the ventilation flow, gas concentration, ventilation duration and other data. In addition, during the setting stage, the control module 7 can open the solenoid valves of the zero gas and the standard gas separately and successively, and use the gas concentration sensor 6 to complete the detection of the concentration of the two gas paths, so as to achieve the purpose of automatic setting and self-checking of the gas concentration of the two gas paths.

[0082] In this embodiment, two one-way valves 61 are preferably provided, one is arranged between the zero gas electromagnetic proportional valve 34 and the zero gas flow sensor 36, and the other is arranged between the standard gas electromagnetic proportional valve 35 and the standard gas flow sensor 37. In this embodiment, two filters 62 are preferably provided, one is arranged between the pressure reducing valve 1 23 and the zero gas electromagnetic proportional valve 34, and the other is arranged between the pressure reducing valve 2 27 and the standard gas electromagnetic proportional valve 35.

[0083] A gas mixing method, based on the above automatic calibration device, comprises the following steps:

[0084] S1, the zero gas cylinder supplies zero gas to the pressure reducing valve 1 23, and the pressure reducing valve 1 23 outputs zero gas with constant pressure. At the same time, the standard gas cylinder supplies standard gas to the pressure reducing valve 27, and the pressure reducing valve 27 outputs zero gas with constant pressure. At this time, the control module 7 opens the zero gas electromagnetic proportional valve 34 and the standard gas electromagnetic proportional valve 35 in sequence, and uses the gas concentration sensor 6 to complete the detection of the concentration of the zero gas and standard gas in the two gas paths, realizing the automatic setting and self-checking of the gas concentration of the two gas paths.

[0085] S2 . Then, the zero gas flow sensor 36 monitors the flow output by the zero gas electromagnetic proportional valve 34 , and feeds back the signal to the control module 7 , and the control module 7 controls the flow output by the zero gas electromagnetic proportional valve 34 .

[0086] S3, the standard gas flow sensor 37 monitors the flow output by the standard gas electromagnetic proportional valve 35, and feeds back the signal to the control module 7, and the control module 7 controls the flow output by the standard gas electromagnetic proportional valve 35.

[0087] S4, the gas concentration sensor 6 monitors the concentration of the zero gas and the standard gas output by the zero gas electromagnetic proportional valve 34 and the standard gas electromagnetic proportional valve 35, and transmits the signal to the control module 7, and the control module 7 completes the linear adjustment of the calibrated sensor according to the ventilation flow, gas concentration and ventilation duration.

[0088] In another embodiment, referring to Figure 4The flow control component 3 includes a zero gas electromagnetic switch valve 38, a standard gas electromagnetic switch valve 39, a total electromagnetic proportional valve 391 and a total flow sensor 392. One end of the zero gas electromagnetic switch valve 38 is connected to the pressure reducing valve 1 23, and the other end is connected to the total electromagnetic proportional valve 391. One end of the standard gas electromagnetic switch valve 39 is connected to the pressure reducing valve 2 27, and the other end is connected to the total electromagnetic proportional valve 391. The total electromagnetic proportional valve 391 is connected to the total flow sensor 392, and the total flow sensor 392 is connected to the gas concentration sensor 6. The zero gas electromagnetic switch valve 38, the standard gas electromagnetic switch valve 39 and the total electromagnetic proportional valve 391 realize a dual-channel flow switch unit and a single-channel flow control unit. While realizing gas mixing and output, two low-cost electromagnetic switch valves replace a set of high-cost electromagnetic proportional valves and flow controllers, which greatly reduces the cost and reduces the difficulty of industrialization.

[0089] In this embodiment, two one-way valves 61 are preferably provided, one is arranged between the zero gas electromagnetic switch valve 38 and the main electromagnetic proportional valve 391, and the other is arranged between the standard gas electromagnetic switch valve 39 and the main electromagnetic proportional valve 391. In this embodiment, two filters 62 are preferably provided, one is arranged between the pressure reducing valve 1 23 and the zero gas electromagnetic switch valve 38, and the other is arranged between the pressure reducing valve 2 27 and the electromagnetic switch valve.

[0090] A gas mixing method, based on the above flow control component, comprises the following steps:

[0091] S1, the zero gas cylinder supplies zero gas to the pressure reducing valve 1 23, and the pressure reducing valve 1 23 outputs zero gas with constant pressure. At the same time, the standard gas cylinder supplies zero gas to the pressure reducing valve 27, and the pressure reducing valve 27 outputs zero gas with constant pressure. At this time, the control module 7 opens the zero gas electromagnetic switch valve 38 and the standard gas electromagnetic switch valve 39 in sequence, and uses the gas concentration sensor 6 to complete the detection of the concentration of the zero gas and standard gas in the two gas paths, realizing the automatic setting and self-checking of the gas concentration of the two gas paths.

[0092] S2, the zero gas electromagnetic switch valve 38 outputs a fixed flow of zero gas, and the standard gas electromagnetic switch valve 39 outputs a fixed flow of standard gas. The zero gas electromagnetic switch valve 38 and the standard gas electromagnetic switch valve 39 are controlled by pulse width modulation. When the frequency is constant, the duty cycle of the driving voltage PWM control signal is changed to realize the flow ratio function of the switch solenoid valve.

[0093] S3, the total flow sensor 392 monitors the flow output by the total electromagnetic proportional valve 391, and feeds back the signal to the control module 7, and the control module 7 controls the flow output by the total electromagnetic proportional valve 391 to achieve stable output control of the flow.

[0094] S4, the gas concentration sensor 6 monitors the concentration of the zero gas and the standard gas output by the main electromagnetic proportional valve 391, and transmits the signal to the control module 7, and the control module 7 completes the linear adjustment of the calibrated sensor according to the ventilation flow, gas concentration and ventilation duration.

[0095] The control module 7 includes a processor 71, a positioning module 72, a display screen 73, an alarm 75, a connection module, a power sensor 77 and an environmental sensor 78. The alarm 75 of the control module 7 is used for alarm prompts, and may include a light alarm 75 and an acoustic alarm 75. The environmental sensor 78 is used to detect the external environment, and may include a temperature sensor, a pressure sensor, a humidity sensor, etc. Based on the parameters of the environmental sensor 78, the volume flow output of the flow control module 7 can be compensated for temperature and pressure.

[0096] The positioning module 72 of the control module 7 is used for position detection, and the calibration position can be located by using UWB, ZigBee, WIFI, 4G, 5G and the like.

[0097] Reference Figure 6 The connection module includes a wireless module 76, a wired module 79 and a camera 74 and other connection methods.

[0098] Specifically, the camera 74 of the control module 7 is an optional item and can be used to photograph the sensor and the surrounding environment to facilitate signal interaction through video recognition.

[0099] The wireless module 76 of the control module 7 is used to establish data connection with the sensor 8 to be tested. Bluetooth, WaveMesh, NB, LoRa, ZigBee, RFID, UWB, infrared, Wifi, 4G, 5G and other methods can be used. Based on the establishment of the data connection channel, the automatic calibration device can communicate with the safety monitoring system of the coal mine enterprise in real time to obtain relevant change information of the equipment in the system to judge the working conditions of the sensor such as alarm, power restoration and power failure.

[0100] Reference Figure 6 and Figure 7, the wired module includes a data repeater 761, which is connected to the sensor 8 to be tested. The data repeater 761 also has a calibration connection port and a system connection port. The calibration connection port is used to connect to the automatic calibration device, and the system connection port is used to connect to the security monitoring system. Through the setting of the data repeater 761, when the maintenance personnel perform maintenance, they only need to connect the automatic calibration device to the calibration connection port through a cable to realize the interaction between the automatic calibration device and the sensor 8 to be tested, so that the sensor 8 to be tested automatically enters the calibration state, thereby realizing automatic calibration, and is not affected by signal interference or the environment, and the calibration efficiency is higher. In addition, in the non-calibration state, the sensor 8 to be tested can also be stably connected to the security monitoring system through the system connection port, which is convenient for uploading or issuing instructions.

[0101] In addition, after the automatic calibration device is connected to the calibration connection port, the automatic calibration device can also be connected to the security monitoring system through the data repeater 761. Compared with the wireless module 76, the communication signal of this method is more stable.

[0102] The data repeater 761 has two forms. One form is that the data repeater 761 is built into the shell of the sensor 8 to be tested, and the other form is that the data repeater 761 is externally mounted on the outside of the shell of the sensor 8 to be tested.

[0103] Specifically, when the data repeater 761 is built into the shell of the sensor 8 to be tested, two aviation sockets need to be reserved on the sensor 8 to be tested, namely the calibration connection port and the system connection port. This method cannot achieve on-site modification, but it is safer.

[0104] The data repeater 761 is mounted outside the shell of the sensor to be tested 8. The data repeater 761 has three interfaces. One interface is connected to the navigation socket of the sensor to be tested 8 itself, and the other two interfaces are the calibration connection port and the system connection port. This method can realize the on-site transformation of the existing wired transmission sensors underground to support automatic calibration of the sensors. The transformation plan is simple and has strong universality. It can greatly broaden the application scope of the automatic calibration device and reduce the application cost.

[0105] The monitoring module is electrically connected to the safety monitoring system, and can upload the calibration process information (such as ventilation flow, ventilation concentration, sensor concentration changes, etc.) to the safety monitoring system in real time. The safety monitoring system automatically generates a multi-dimensional data packet containing "ventilation time-gas flow-gas concentration-sensor output value" and compares it with the historical ventilation data, thereby realizing fault diagnosis and life analysis of the sensor detection elements, and tracking and analysis of the health status of the probe.

[0106] The display of the control module 7 displays the relevant data of the automatic calibration device and the sensor to be tested 8, and can adopt an LED screen, a liquid crystal screen, a touch screen, etc.

[0107] The control module 7 is also connected to a battery assembly 79, which provides power for the flow controller and has a built-in battery protection board with multiple storage functions such as voltage, current, overload, overcharge, over-discharge, overheating, etc., and has power, voltage and current monitoring functions.

[0108] Automatic calibration devices can be portable, fixed, embedded, and other forms. Portable devices include backpack, shoulder bag, handheld, wheeled, etc., which are convenient for calibration personnel to carry with them. Fixed devices can be directly set at the underground sensor installation site and used as needed, or placed on a robotic arm, which can be automatically raised and lowered by program control to approach the sensor to be calibrated for automatic calibration. Embedded devices can integrate sensors with automatic calibration devices to derive mining self-calibrating gas sensors, which do not require maintenance personnel to go down to the mine for calibration operations, and can achieve regular calibration.

[0109] A calibration robot includes a patrol robot, the automatic calibration device is installed on the patrol robot, so that the automatic calibration device can be transported to the sensor that needs calibration by the patrol robot, the patrol robot is equipped with a moving device and a positioning device, the moving device can be crawler-type, so that it can move in the coal mine passage, and the positioning device is convenient for identifying the positioning point installed in the coal mine passage, so as to achieve accurate positioning. The patrol robot is also provided with a mechanical arm to connect the pipeline between the automatic calibration device and the sensor that needs calibration.

[0110] A calibration method, based on the above calibration device, refers to Figure 8 , including the following steps:

[0111] S1. The calibration device is turned on, and the operator logs in and takes a photo to ensure the operator's identity. The camera 74 of the calibration device is used to check the installation position of the sensor 8 to be tested, and the built-in algorithm of the calibration device is called to judge whether the installation position meets the standard. This step does not affect the subsequent calibration process, but only identifies the abnormal installation position of the sensor and provides installation and maintenance suggestions to the user.

[0112] S2. Unscrew the dust cover of the sensor 8 to be tested, check whether the sensor 8 to be tested is blocked and whether maintenance is required, and take photos and records. The calibration device automatically determines whether maintenance is required. After ensuring that the sensor is not blocked, perform the following steps.

[0113] S3. Establish a data connection between the calibration device and the sensor 8 to be tested. The connection method can be wired or wireless, such as: RS485, CAN, Bluetooth, WaveMesh, NB, LoRa, ZigBee, RFID, UWB, infrared, Wifi, 4G, 5G, etc.

[0114] S4. The calibration device obtains the self-diagnosis information of the health status of the sensor. If there is a problem that affects the normal operation of the sensor, such as a failure in the gas detection function of the sensor or an abnormality in the communication function between the sensor and the system, the calibration of the sensor will be stopped. The calibration device has the function of analyzing and resolving sensor faults, and can provide users with further maintenance suggestions, display them on the display, and remind users of faults through sound and light alarms. If the fault is eliminated after maintenance, the subsequent steps will be continued.

[0115] S5. Connect the vent cover to the air inlet of the sensor and use the remote control to start the calibration process of the sensor. The start operation can also be started by pressing the start button on the calibration device. The calibration device can automatically complete a series of operations related to calibration, including:

[0116] S51, enter the online calibration state;

[0117] S52, introduce zero gas at a specified flow rate;

[0118] S53, adjust the sensor zero point;

[0119] S54, introducing standard gas with alarm value concentration, that is, introducing a mixture of zero gas and standard gas;

[0120] S55, testing the alarm point of the sensor, i.e. checking whether the sensor has sound and light alarms;

[0121] S56, introducing standard gas of the power-off point concentration, that is, introducing a mixture of zero gas and standard gas;

[0122] S57, testing the power-off point of the sensor, i.e. checking whether the associated equipment is powered off;

[0123] S58, introduce standard gas at a specified flow rate;

[0124] S59, timing of standard gas flow;

[0125] S510, adjust sensor linearity;

[0126] S511, introducing standard gas of the concentration of the recharge point, that is, introducing a mixture of zero gas and standard gas;

[0127] S512, testing the sensor power-on point, that is, checking whether the associated device is powered on;

[0128] S513, exit the calibration state.

[0129] S6. If the response time of the sensor needs to be tested, pass the calibration gas to the sensor. The response time is the difference between the moment when the sensor reaches 90% of the calibration gas sample concentration and the moment when the calibration gas sample is introduced.

[0130] S7. If you need to test the filter blockage of the sensor, you can open the zero gas opening valve 1 according to the default opening, and determine the flow value of the flow sensor to obtain the filter blockage. Because the output pressure of the pressure reducing valve is constant, the opening of the opening valve 1 is constant, and the air flow is directly affected by the back pressure drop of the filter blockage. If the output flow is less than the specified value, it means that the filter pressure drop is too large and the blockage is serious. The filter needs to be replaced to ensure that the sensor works normally under natural diffusion.

[0131] S8. When the calibration device completes the ventilation calibration operation, it uploads the calibration related data in real time and forms a calibration record. The calibration data includes: calibration personnel, calibration start time, calibration end time, calibration gas type, calibration gas flow, calibration gas concentration, sensor concentration, etc. The safety monitoring system automatically generates a multi-dimensional data packet containing "ventilation time-gas flow-gas concentration-sensor output value" based on the calibration data, and compares it with the historical ventilation data, thereby realizing the fault diagnosis and life analysis of the sensor detection element, and realizing the tracking and analysis of the health status of the probe. If a fault is identified in the sensor probe, the calibration process is interrupted to remind the calibration personnel to replace the relevant sensor.

[0132] S9. The calibration device detects and identifies the working condition information such as pressure, temperature, humidity and position information in the environment in real time, and can transmit the detection information to the sensor. The sensor 8 to be tested can use this information to compare and correct the information, and can further invert its own position information and compare it with the historical position information to identify the position compliance.

[0133] A portable gas calibration toolbox for underground coal mines, which is convenient for storing gas supply modules. Figures 9 to 16 , including a main box body 1 and an upper cover 11, the upper cover 11 is covered on the main box body 1 and connected to the main box body 1 through a lock 111. The bottom of the main box body 1 is connected with an inner liner 12, and the gas cylinder assembly 2 and the flow control assembly 3 are arranged on the inner liner 12, and the inner liner 12 is suitable for supporting the gas cylinder assembly 2 and the flow control assembly 3. The gas cylinder assembly 2 is suitable for storing zero gas and standard gas, and the flow control assembly 3 is connected to the output end of the gas cylinder assembly 2, and is suitable for controlling the output of the gas in the gas cylinder assembly 2. A cover plate 13 is also connected to the main box body 1, and the cover plate 13 is covered on the gas cylinder assembly 2 and the flow control assembly 3 to cooperate with the inner liner 12 to fix the gas cylinder assembly 2 and the flow control assembly 3 in the main box body 1. An air outlet nozzle 14 is installed on the side wall of the main box body 1, and the air outlet nozzle 14 is connected to the output end of the flow control assembly 3. The air outlet nozzle 14 can be set on the front or on the side.

[0134] Specifically, the main box body 1 and the upper cover 11 are made of high-strength flame-retardant and anti-static special engineering plastics, with a sturdy structure, light weight and easy to carry. A handle 154 is installed on the top of the upper cover 11 for carrying by hand. An observation window is provided on the outside of the main box body 1, and the observation window includes two circular observation windows 151 and a square observation window 15. The circular observation window 151 is used to observe the pressure of the internal gas cylinder assembly 2, and the square observation window 15 is used to view the display parameters of the flow control assembly 3, which is also convenient for remote control of the controller from the outside. Hanging rings 153 are installed on both sides of the main box body 1 to facilitate the installation of shoulder straps and one-shoulder crossbody carrying. A double shoulder strap mounting buckle 152 is installed on the back of the main box body 1 to facilitate the installation of double shoulder straps and double shoulder carrying.

[0135] More specifically, when calibrating a methane sensor, the zero gas is generally air or nitrogen, and the calibration gas is a methane gas of a specified concentration (such as 2% methane); when calibrating a carbon monoxide sensor, the zero gas is generally air, and the calibration gas is a carbon monoxide gas of a specified concentration (such as 500PPM carbon monoxide). To calibrate other types of sensors, configure the zero gas and calibration gas as needed.

[0136] Both the gas cylinder 1 21 and the gas cylinder 2 22 are provided with a needle valve 24. Both the pressure reducing valve 1 23 and the pressure reducing valve 2 27 are used to reduce the high pressure gas (1-10MPa pressure) in the gas cylinder to a constant lower pressure (0.1-1MPa pressure), and then transport it to the flow control component 3 through the gas outlet joint to achieve stable pressure input. Both the pressure reducing valve 1 23 and the pressure reducing valve 2 27 are provided with an adjustment knob 231, and the adjustment knob 231 is extended out of the cover plate 13 so that the operator can rotate the adjustment knob 231. The pressure reducing valve is also provided with an inflation joint and an outlet joint. The outlet interface 33 can be a quick-plug joint, which is convenient for the quick removal of the trachea and the replacement and adjustment of the gas cylinder. The inflation joint is an inflation quick-plug male joint to achieve quick connection and inflation. At the same time, the inflation joint is a one-way joint that can only be output from the pressure reducing valve 1 and cannot flow back. The needle valve 24 is used to connect the gas cylinder and the pressure reducing valve, and a bursting disc is fixed on the needle valve 24. When the pressure inside the gas cylinder exceeds the normal working pressure of the gas cylinder, the bursting disc will rupture to relieve the pressure of the gas cylinder and ensure the safety of the gas cylinder.

[0137] A charging port and a switch are installed on the top of the flow control component 3 to charge and control the opening and closing of the flow control component 3. The flow control component 3 is provided with a zero gas interface 31, a standard gas interface 32 and an outlet interface 33. The outlet connectors include a zero gas outlet connector 26 and a standard gas outlet connector. The zero gas outlet connector 26 is provided on the gas cylinder 1 21, and the standard gas outlet connector is provided on the gas cylinder 2 22. The zero gas outlet connector 26 is connected to the zero gas interface 31, the standard gas outlet connector is connected to the standard gas interface 32, and the outlet interface 33 on the flow control component 3 is connected to the outlet nozzle 14 on the main box 1. The two air inlets are respectively connected to the outlet of the gas cylinder 1 21 and the outlet of the gas cylinder 2 22, and the one outlet is connected to the bag outlet. When deflation is used, the upper cover 11 of the calibration tool box is opened, and the gas cylinder 1 21 or the gas cylinder 2 22 is opened by adjusting the knob 231, and the air flow of the gas cylinder 1 21 or the gas cylinder 2 22 can be transmitted to the air inlet of the flow control component 3 through the air path.

[0138] The charging joint includes a zero gas charging joint 25 and a standard gas charging joint. The zero gas charging joint 25 is arranged on the gas cylinder 1 21, and the standard gas charging joint is arranged on the gas cylinder 2 22. The cover plate 13 is connected with a vacuum joint and a three-way valve. The vacuum joint includes a zero gas vacuum joint 131 and a standard gas vacuum joint 132. The three-way valve includes a zero gas three-way valve 133 and a standard gas three-way valve 134. The three joints of the zero gas three-way valve 133 are respectively connected to the zero gas outlet joint 26, the zero gas vacuum joint 131 and the zero gas interface 31. The three joints of the standard gas three-way valve 134 are respectively connected to the standard gas outlet joint, the standard gas vacuum joint 132 and the standard gas interface 32.

[0139] It should be noted that the cover plate 13 is provided with an inflation hole 135 for the inflation connector to pass through; the cover plate 13 is provided with a vacuum hole 136 for the vacuum connector to pass through. The cover plate 13 is provided with a fixed structure related to the gas circuit to fix and store the gas circuit accessories of the gas cylinder assembly 2 and the flow control assembly 3 to ensure reliable connection of the gas circuit. In addition, the cover plate 13 also has personnel protection and explosion-proof functions. By connecting with the main box body 1, the gas cylinder assembly 2 and the flow control assembly 3 are enclosed inside the main box body 1 to ensure the safety of the calibration toolbox.

[0140] A filling method is provided, based on the calibration toolbox mentioned above, and is performed by a filling machine.

[0141] Reference Figures 17 to 19The filling machine includes a filling machine cabinet 4 and an inflation module and a vacuum module arranged on the filling machine cabinet 4. The vacuum module is connected to the vacuum joint through a vacuum pipeline 44, and the inflation module is connected to the inflation interface through an inflation pipeline 43. A protective observation window 46 and a control panel 45 are provided on the filling machine cabinet 4. The protective observation window 46 is fixed to the filling machine cabinet 4 by a hinge. The machine can be started only after the protective observation window 46 is closed. The control panel 45 is convenient for operating the filling machine.

[0142] Specifically, the vacuum module includes a vacuum pump 41, a first pressure sensor 411 and a first solenoid valve 412. The first solenoid valve 412 is connected to the vacuum pump 41. The first solenoid valve 412 is connected to the vacuum joint through a vacuum pipeline 44. The first pressure sensor 411 is installed on the pipeline between the first solenoid valve 412 and the vacuum pump 41. The first pressure sensor 411 is electrically connected to the first solenoid valve 412 and the vacuum pump 41 so that the first solenoid valve 412 and the vacuum pump 41 are closed when the pressure in the pipeline reaches a set pressure value.

[0143] More specifically, two sets of the first solenoid valve 412 and the vacuum line 44 are provided to vacuum the gas cylinder 1 21 and the gas cylinder 2 22 respectively.

[0144] The inflation module includes a boost pump 42, a second pressure sensor 421, a pressure relief valve 422, a second solenoid valve 423, a zero gas supply unit and a standard gas supply unit. The boost pump 42 is connected to the zero gas supply unit and the standard gas supply unit. One end of the second solenoid valve 423 is connected to the inflation joint through the inflation pipeline 43, and the other end is connected to the pressure relief valve 422. The pressure relief valve 422 is also connected to the boost pump 42. The second pressure sensor 421 is connected to the pipeline between the pressure relief valve 422 and the boost pump 42, and the second pressure sensor 421 is electrically connected to the second solenoid valve 423, so that when the pressure in the pipeline reaches the set pressure value, the gas path is cut off through the second solenoid valve 423. The pressure relief valve 422 is responsible for depressurizing the pressurized high-pressure pipeline after inflation is completed.

[0145] More specifically, the second solenoid valve 423 and the gas charging pipeline 43 are each provided with two groups so as to charge the gas cylinder 1 21 and the gas cylinder 2 22 respectively.

[0146] The zero gas supply unit and the standard gas supply unit supply zero gas and standard gas respectively. Taking the calibration of methane sensor as an example, the zero gas is air at this time, so the zero gas supply unit includes a third solenoid valve 424 and an air filter 62425. One end of the air filter 62425 is connected to the atmosphere, and the other end is connected to the third solenoid valve 424. The third solenoid valve 424 is connected to the booster pump 42 to supply filtered air. The air filter 62425 can adopt a triple air filter 62425. The standard gas supply unit includes a standard gas cylinder 426, an output pressure reducing valve 427 and a fourth solenoid valve 428 connected in sequence. The fourth solenoid valve 428 is connected to the booster pump 42. The high-pressure gas in the standard gas cylinder 426 is reduced to low-pressure gas through the output pressure reducing valve 427, and then enters the booster pump 42 for pressurization and pumping. The design of first depressurizing the large gas cylinder (air or standard gas cylinder 426) and then pressurizing it to the gas cylinder assembly 2 can ensure that the filling machine fully utilizes the gas in the large gas cylinder, and also ensures that the gas cylinder pressure of the small gas cylinder (gas cylinder 1 21 or gas cylinder 2 22) meets the use requirements, maximizing the number of sensors that can be calibrated by the calibration tool box. Through the booster, the remaining gas in the standard gas cylinder can be maximized to avoid the problem of gas waste due to insufficient pressure in the large gas cylinder.

[0147] For the vacuuming step, the vacuuming connector uses a self-locking quick-plug female connector with a one-way valve 61. If the male connector is not inserted into the female connector, the gas circuit cannot be connected. The operating pressure range of this vacuuming connector is -00kPa-.0MPa, which is fully capable of withstanding the pressure fluctuations caused by vacuuming. During normal gas discharge, the vacuuming male connector is not inserted, and the one-way valve 61 of the female connector is self-locking, so that gas cannot be discharged from the quick-plug female connector. The pressurized gas in the gas circuit acts on the one-way valve 61, and the normal pressure air in the environment cannot enter the pipeline, avoiding dilution of the gas flow in the gas circuit. When vacuuming and exhausting, the male connector is inserted into the female connector, and the one-way valve 61 of the female connector is opened, so that air can be pumped out from the female connector to realize the operation of vacuuming and exhausting from the gas cylinder.

[0148] For the inflation step, the head of the inflation quick plug male connector is designed with a dust-proof brass filter to prevent impurities in the filled gas from entering the gas cylinder. The inflation quick plug male connector contains a one-way valve 61, and the flow direction of the one-way valve 61 is only in but not out. The intake start pressure of the one-way valve 61 is much greater than MPa to prevent the mixing of normal pressure gas. During normal gas discharge, the one-way valve 61 of the inflation quick plug male connector is self-locking, and the gas cannot be discharged from the inflation quick plug male connector. The pressurized gas in the pressure reducing valve acts on the one-way valve 61, and the normal pressure gas in the environment cannot enter the pressure reducing valve, avoiding the air flow in the gas cylinder from being affected. In the inflation state, the female connector on the inflation flexible tube is connected to the inflation quick plug male connector of the pressure reducing valve. The booster pressurizes the gas in the gas cylinder or the environment, and then pumps it into the gas cylinder through the inflation flexible tube. When the pressure in the flexible tube reaches the preset pressure, the booster stops working and the gas filling is completed.

[0149] The vacuum line 44 is led out from the cabinet. The line is a pressure-resistant PU hose. One end is connected to the matching vacuum pump 41 of the inflation drive module. The line switch is realized by using a solenoid valve. One end is a quick-plug vacuum male connector to connect with the self-locking quick-plug female connector on the gas cylinder assembly 2. The inflation line 43 is led out from the cabinet. The line adopts an explosion-proof metal flexible tube. One end is connected to the booster pump 42 of the inflation module. The other end is a quick-plug inflation female connector, which is connected to the inflation quick-plug male connector of the gas cylinder assembly 2. The booster pump 42 is connected to the standard gas cylinder 426 by a booster pipeline. The booster pipeline is led out from the cabinet. The additional pipeline adopts an explosion-proof metal flexible tube. The fourth solenoid valve 428 is used to realize the switch. The inflation module adopts a male connector and the vacuum module adopts a female connector, which is convenient for the operator to distinguish and realize quick operation.

[0150] Filling by a filling machine includes the following steps:

[0151] S1. Open the upper cover 11 of the calibration tool box, push the tool box into the filling station of the filling machine and fix it.

[0152] S2, connect the vacuum pipe 44 and the gas pipe 43 of the filling machine to the vacuum joint and the gas joint of the calibration tool box, and confirm that the connection is reliable. Specifically, the two sets of vacuum pipes 44 are connected to the zero gas vacuum joint 131 and the calibration gas vacuum joint 132 respectively.

[0153] S3. Open the adjusting knob 231 on the pressure reducing valve of the calibration tool box, and close the protective observation window 46 of the filling machine.

[0154] S4. Start the automatic filling program through the control panel 45 of the filling machine:

[0155] S5. Vacuuming the gas cylinder 21: The filling machine starts the vacuum pump 41, opens the first solenoid valve 412 connected to the gas cylinder 21, and evacuates the gas cylinder 21. When the first pressure sensor 411 detects that the pipeline reaches a predetermined vacuum degree, the first solenoid valve 412 is closed, and the vacuum pump 41 is turned off.

[0156] S6. Filling of gas cylinder 21: the filling machine starts the booster pump 42, opens the second solenoid valve 423 and the third solenoid valve 424 connected to the gas cylinder 21, and fills the gas cylinder 21 with air filtered by the filter 62. After the second pressure sensor 421 detects that the pipeline pressure reaches the predetermined inflation pressure, the booster pump 42 is stopped, the pressure relief valve 422 is started, the inflation pipeline 43 is depressurized, and then the second solenoid valve 423 and the third solenoid valve 424 are closed.

[0157] S7, evacuating the second gas cylinder 22: the filling machine starts the vacuum pump 41, opens the first solenoid valve 412 connected to the second gas cylinder 22, evacuates the second gas cylinder 22, and after the first pressure sensor 411 detects that the pipeline pressure reaches a predetermined vacuum degree, the first solenoid valve 412 is closed, and the vacuum pump 41 is turned off;

[0158] S8. Filling of gas cylinder 22: the filling machine starts the booster pump 42, opens the second solenoid valve 423 and the fourth solenoid valve 428 connected to gas cylinder 22, and fills gas cylinder 22 with standard gas from standard gas cylinder 426. After the second pressure sensor 421 detects that the pipeline reaches a predetermined inflation pressure, the booster pump 42 is stopped, the pressure relief valve 422 is started, the inflation pipeline 43 is depressurized, and then the second solenoid valve 423 and the fourth solenoid valve 428 are closed.

[0159] S9. After gas filling is completed, first check through the observation window whether the cylinder pressure gauge has reached the set pressure, then open the protective observation window 46, close the pressure reducing valve adjustment knob 231 of the calibration tool box, disconnect the vacuum line 44 and the gas filling line 43, take out the calibration tool box, close the calibration tool box cover 11, and the gas filling is completed.

[0160] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An automatic calibration device, characterized in that: include A detection module, used for outputting gas to a sensor to be tested (8) for detection; A control module (7), the control module (7) being electrically connected to the detection module to control the detection module; A monitoring module, the monitoring module being electrically connected to the control module (7) so that the control module (7) outputs data to the monitoring module; A gas supply module is connected to the detection module to supply detection gas to the detection module.

2. The automatic calibration device according to claim 1, characterized in that: The gas supply module comprises a gas cylinder assembly (2), and the detection module comprises a flow control assembly (3) and a gas concentration sensor (6). The gas cylinder assembly (2) is connected to the flow control assembly (3) and is suitable for outputting a zero point calibration gas and a linear calibration gas to the flow control assembly (3). The flow control assembly (3) is suitable for mixing the two gases output by the gas cylinder assembly (2) and controlling the mixing ratio and on-off of the mixed gas. The gas sensor (6) is connected to the flow control assembly (3) to facilitate the detection of gas concentration.

3. The automatic calibration device according to claim 1, characterized in that: The control module (7) comprises An environmental sensor (78), adapted to detect the external environment; A positioning module (72) adapted for position detection; A connection module, adapted to be connected to a sensor (8) to be tested for data transmission; The connection module includes a wireless module (76), a wired module and a camera (74); The wired module includes a data repeater (761), which is connected to the sensor to be tested (8). The data repeater (761) also has a calibration connection port and a system connection port. The calibration connection port is used to connect to the automatic calibration device, and the system connection port is used to connect to the security monitoring system.

4. The automatic calibration device according to claim 1, characterized in that: The monitoring module is electrically connected to the safety monitoring system to upload the calibration process information to the safety monitoring system in real time. The safety monitoring system automatically generates a multi-dimensional data packet containing "ventilation time-gas flow-gas concentration-sensor output value" and compares it with historical ventilation data to realize fault diagnosis and life analysis of the sensor detection element.

5. A calibration robot, characterized in that: It comprises an inspection robot, which is suitable for moving the automatic calibration device described in any one of claims 1-4.

6. A calibration method, based on the automatic calibration device according to any one of claims 1 to 4, characterized in that: The steps include: S1. The calibration device is turned on, and the operator logs in and takes a photo to ensure the operator's identity; S2, unscrewing the dust cover of the sensor to be tested (8), checking whether the sensor to be tested (8) is blocked and whether maintenance is required, and taking photos and recording. The calibration device automatically determines whether maintenance is required. After ensuring that the sensor is not blocked, the subsequent steps are executed; S3, establishing a data connection between the calibration device and the sensor to be tested (8); S4. The calibration device obtains the self-diagnosis information of the health status of the sensor. If there is a problem that affects the normal operation of the sensor, such as a failure in the gas detection function of the sensor or an abnormality in the communication function between the sensor and the system, the calibration of the sensor is stopped; S5, connecting the vent hood to the air inlet of the sensor to be tested (8), and the calibration device automatically completes the calibration-related operations; S6. Complete calibration.

7. The calibration method according to claim 6, characterized in that: In S5, the calibration operation includes: S51, enter the online calibration state; S52, introduce zero gas at a specified flow rate; S53, adjust the sensor zero point; S54, introducing standard gas with alarm value concentration; S55, test the alarm point of the sensor; S56, introduce standard gas with the concentration of power-off point; S57, test the sensor power-off point; S58, introduce standard gas at a specified flow rate; S59, timing of standard gas flow; S510, adjust sensor linearity; S511, introduce standard gas of the concentration of the recharge point; S512, testing the sensor re-powering point; S513, exit the calibration state.

8. The calibration method according to claim 6, characterized in that: In S2, if it is necessary to test the filter blockage of the sensor, the zero gas is opened at the default opening, and the filter blockage condition can be obtained by judging the flow value output by the flow control component (3).

9. The calibration method according to claim 6, characterized in that: In S5, if the response time of the sensor needs to be tested, calibration gas is passed to the sensor. The response time is the difference between the time when the sensor reaches 90% of the calibration gas sample concentration and the time when the calibration gas sample is passed.

10. The calibration method according to claim 6, characterized in that: In S5, the calibration device detects and identifies the working condition information in the environment in real time, and transmits the detection information to the sensor to be tested (8). The sensor to be tested (8) uses this information to compare and correct information, and further inverts its own position information, compares it with the historical position information, and identifies the position compliance.

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