Flow linear automatic adjustment control device for coal mine gas sensor adjustment

Abstract

The invention relates to a flow linear automatic adjustment control device for coal mine gas sensor adjustment, and belongs to the field of coal mine safety metering. The device comprises a flow detection unit, an automatic flow regulation control unit, a host and a power supply unit, the flow detection unit comprises an air chamber, a front-end flow detection miniature probe rod, a rear-end flow detection miniature probe rod, a front-end flow detection sensor and a rear-end flow detection sensor; the automatic flow adjusting control unit comprises a front-end automatic flow adjusting valve, a rear-end automatic flow adjusting valve, a front-end driver, a rear-end driver and a stainless steel air pipe. The gas flow can be automatically adjusted and controlled, and on-site coal mine adjustment and carrying are facilitated.

Description

Technical Field

[0001] The invention belongs to the field of coal mine safety measurement and relates to a flow linear automatic regulating control device for adjusting a coal mine gas sensor. Background Art

[0002] It is an important daily task for coal mines to regularly calibrate and test the methane sensors, carbon monoxide sensors, hydrogen sulfide sensors, and portable methane alarms used on site. The purpose is to ensure that the monitoring data of sensors and portable instruments are accurate, and to be able to warn and alarm when toxic and harmful gases exceed the limit. Before calibrating the sensor, first connect the standard gas sample bottle to the pressure reducing valve, the pressure reducing valve to the glass rotor flowmeter or plastic rotor flowmeter, and the flowmeter to the sensor through a hose. During the calibration process, open the valve and pressure reducing valve of the standard gas sample bottle, observe the pressure of the gas cylinder, manually adjust the flow regulating valve under the glass rotor flowmeter or plastic rotor flowmeter, and gradually make the flow reach the target value. During this process, observe the alarm value, power-off value, and power-on value of the sensor. When the flow reaches the target value, stay for 90 seconds, adjust the sensor accuracy to make it consistent with the standard gas sample concentration, and complete the sensor calibration. Since the sensor calibration work needs to be completed on-site, it is affected by factors such as the underground coal mine environment (narrow space, high-altitude operations, dust concentration, insufficient light), pressure changes in the standard gas sample bottle, operator proficiency, valve adjustment force control, etc. During the on-site calibration process, it is difficult for operators to control the gas flow rate. The flow rate is sometimes large and sometimes small, and it reaches or exceeds the target flow value at one time, resulting in unstable fluctuations in the flow rate after reaching the target value. The sensor value is sometimes high and sometimes low, and the rising process of the sensor value cannot be observed. At the same time, as the calibration proceeds, the air pressure in the gas sample bottle also decreases, and the sensor value will also change accordingly. At this time, the sensor coefficient is adjusted to make the sensor display value consistent with the standard gas sample value. This method is not an adjustment under the standard flow state, resulting in a large error in the sensor calibration and inaccurate sensor monitoring data. At the same time, glass rotor flowmeters or plastic rotor flowmeters are used as metering devices. Since operators read the data at different angles and the float fluctuates slightly with the size of the input flow, the flow readings are not accurate. This method is not an adjustment under standard flow conditions, which leads to errors in sensor calibration. Since there are errors in the sensor calibration process, the accuracy of the sensor in daily monitoring is reduced, and the purpose of accurate monitoring cannot be achieved. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a flow linear automatic adjustment control device for coal mine gas sensor calibration, which has the function of displaying parameters such as instantaneous flow, cumulative flow, pressure, temperature, etc., and can automatically adjust and control the gas flow, which is convenient for on-site calibration and carrying in coal mines. During the calibration process, the gas flow is automatically adjusted, the gas flow is automatically controlled and gradually increases linearly, and it automatically stops and maintains for 90 seconds after reaching the set target value. When the time is reached, the flow regulating valve is automatically closed, and the success of the calibration is judged according to parameters such as flow and pressure, and the results are displayed on the LCD display. The entire calibration process does not require human operation and control, and sensor calibration errors are eliminated.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A flow linear automatic regulation control device for coal mine gas sensor calibration, comprising a flow detection unit, a flow automatic regulation control unit, a host and a power supply unit; the flow detection unit comprises an air chamber, a front-end flow detection micro-probe, a rear-end flow detection micro-probe, a front-end flow detection sensor and a rear-end flow detection sensor; the flow automatic regulation control unit comprises a front-end automatic flow regulation valve, a rear-end automatic flow regulation valve, a front-end driver, a rear-end driver and a stainless steel gas pipe.

[0006] The standard gas sample bottle is directly connected to the gas chamber through a nut. One end of the front-end flow detection micro probe is inserted into the gas chamber, and the other end is connected to the front-end flow detection sensor. The front-end flow detection sensor converts, amplifies, calculates and processes the detection signal, and then inputs the processed signal into the host.

[0007] One end of the rear-end flow detection micro-probe is inserted into the trachea, and the other end is connected to the rear-end flow detection sensor. The rear-end flow detection sensor converts, amplifies, calculates and processes the detection signal, and then inputs the processed signal into the host;

[0008] A front-end automatic flow regulating valve is installed between the air chamber of the flow detection unit and the input end of the stainless steel air pipe, the front-end automatic flow regulating valve is connected to the front-end driver, and the front-end driver is connected to the host; a rear-end automatic flow regulating valve is installed at the output end of the stainless steel air pipe, the rear-end automatic flow regulating valve is connected to the rear-end driver, and the rear-end driver is connected to the host; a hose is used to connect the rear-end automatic flow regulating valve and the air chamber of the sensor to be adjusted, so as to facilitate operation and adjustment by on-site personnel.

[0009] Preferably, the installation method of the front-end flow detection micro-probe is: according to the size of the front-end flow detection micro-probe, a micro-hole is made above the air chamber, and then the probe is inserted into the position of 1 / 2 of the inner diameter of the air chamber, and effectively sealed;

[0010] The installation method of the rear-end flow detection micro-probe is: according to the size of the rear-end flow detection micro-probe, a micro-hole is made on the stainless steel air pipe, and then the probe is inserted into the 1 / 2 position of the inner diameter of the air pipe, and effectively sealed.

[0011] Preferably, when the front-end flow detection micro-probe detects fluid flowing through the air chamber, a high-pressure distribution area is generated in the front of the probe in the flow direction, and a low-pressure distribution area is generated in the back of the probe in the back flow direction. The front-end flow detection sensor arranges multiple pairs (generally three pairs) of pressure holes in the high and low pressure areas according to certain rules to measure the total pressure (including static pressure and average velocity pressure) and static pressure of the fluid respectively. The front-end flow detection sensor converts, amplifies and processes the measured pressure signal and uploads it to the host. After the host receives the signal from the front-end flow detection sensor, the host sends a command to the front-end driver to start the front-end automatic flow regulating valve. The front-end driver starts to execute the startup procedure according to the preset parameters, gradually opens the front-end automatic flow regulating valve, and the standard gas sample enters the stainless steel air pipe.

[0012] Preferably, when the rear-end flow detection micro-probe detects fluid flowing in the stainless steel air pipe, a high-pressure distribution area is generated in the front part of the rear-end flow detection micro-probe in the flow-facing direction, and a low-pressure distribution area is generated in the rear part of the probe in the back-flow direction. The rear-end flow detection sensor has multiple pairs (generally three pairs) of pressure holes arranged according to certain rules in the high and low pressure areas to measure the total pressure (including static pressure and average velocity pressure) and static pressure of the fluid respectively. The rear-end flow detection sensor converts, amplifies and processes the measured pressure signal and uploads it to the host. After the host receives the signal from the rear-end flow detection sensor, the host sends a command to the rear-end driver to start the rear-end automatic flow regulation valve. The rear-end driver starts to execute the startup procedure according to the preset parameters, gradually opens the rear-end automatic flow regulation valve, and the standard gas sample enters the air chamber of the sensor to be calibrated through the hose, thereby realizing automatic adjustment of the sensor.

[0013] Preferably, the host includes a modular mainboard, a main casing, an LCD display screen and panel buttons; the flow detection unit and the automatic flow adjustment control unit are respectively placed on the left and right sides of the main casing, and the left and right sides of the main casing are respectively provided with latches to facilitate fixing the sensor and the driver, and the stainless steel air pipe is placed under the main casing; the modular mainboard is fixed to the back panel of the main casing by screws, and the LCD display screen is fixed to the front panel of the main casing by screws, and the LCD display screen and the modular mainboard are connected by precision soft cables; the panel buttons use a film panel, which is pasted on the outside of the front panel of the main casing, and the film panel includes "set", "up", "down", "confirm" and "switch" buttons, and the film panel and the modular mainboard are connected by precision soft cables.

[0014] Preferably, the power supply unit includes multiple lithium batteries and a charge-discharge conversion circuit; the multiple lithium batteries form a battery pack, and the battery pack is placed under the modular mainboard. Before use, an external DC power supply charges the lithium batteries through the charge-discharge conversion circuit. During use, the lithium batteries are discharged through the charge-discharge conversion circuit to power circuits such as the host, flow detection unit, and automatic flow regulation control unit.

[0015] Preferably, when the device is adjusted, the valve of the standard gas sample bottle is opened, and the standard gas sample flows into the gas chamber. When the front-end flow detection probe detects that there is fluid passing through, the collected signal is uploaded to the front-end flow detection sensor, which converts, amplifies, calculates and processes the signal and then uploads it to the host. After receiving the signal, the host issues an instruction to start the front-end automatic flow regulating valve, the front-end driver executes the instruction, and the front-end automatic flow regulating valve is started according to the instruction; at this time, the gas flows through the stainless steel air pipe, and the rear-end flow detection micro-probe detects that there is fluid passing through, and also gradually uploads the signal to the host. After receiving the signal, the host issues an instruction to start the rear-end automatic flow regulating valve, the rear-end driver executes the instruction, and the rear-end automatic flow regulating valve is started according to the instruction, and the gas flows to the sensor gas chamber through the hose, so as to adjust the sensor; at the same time, the host calculates the instantaneous flow and cumulative flow of the gas through the rear-end automatic flow regulating valve by collecting parameters such as temperature, pressure and pressure difference of the rear-end flow detection sensor, and displays the real-time temperature and pressure parameters monitored on the host display;

[0016] When the adjustment time reaches the preset duration, the host first sends an instruction to close the front-end automatic flow regulating valve, the front-end driver executes the instruction, and the front-end automatic flow regulating valve is gradually closed. After the front-end automatic flow regulating valve is closed, the host sends an instruction to close the back-end automatic flow regulating valve, the back-end driver executes the instruction, and the back-end automatic flow regulating valve is gradually closed. The instantaneous flow, air pressure stability time, air pressure change and other parameters are used to determine whether the adjustment is successful. If successful, "success" will be displayed on the display screen, otherwise "failure" is displayed and it needs to be re-calibrated or the gas sample bottle is replaced for re-adjustment.

[0017] The beneficial effects of the present invention are:

[0018] (1) The present invention can realize a linear increase in gas flow. During the calibration process, the sensor data increases linearly, and the sensor alarm value, power-off value, power-on value, and multi-system linkage response time can be clearly observed; the central station software has a smoother historical curve through sensor data.

[0019] (2) The present invention adopts automatic adjustment instead of manual adjustment, and no manual operation is required throughout the process. The gas rotor flowmeter used previously controls the gas flow rate by manually operating the flow control valve to gradually reach the target value, while the device can automatically adjust and control the gas flow rate, and no manual operation is required throughout the process from startup to shutdown.

[0020] (3) The present invention uses digital display instead of float display. The gas rotor flowmeter used previously controls the flow regulating valve manually, so that the float moving in the flowmeter cone tube rises with the increase of gas pressure and gradually reaches the target value. During the adjustment process, the flow control is achieved by observing the reading of the float position; while the device digitally displays the current instantaneous flow, cumulative amount, pressure and other parameters. The cumulative amount can directly observe the gas usage in the gas cylinder, which is an important indicator for judging whether it can continue to be used.

[0021] (4) The sensor calibration of the present invention is more accurate. The original calibration method is affected by factors such as the gas pressure in the gas cylinder, human control, and on-site environment. During the calibration process, the gas flow rate fluctuates, resulting in a linear and disproportionate growth of the sensor data, and a large sensor calibration error. The automatic calibration control device is not affected by factors such as the gas pressure in the gas cylinder and human control. The gas flow rate increases linearly, and the sensor data increases linearly and proportionally. When the target flow value is reached, the flow rate can be stable, and the precision calibration of the sensor is more accurate.

[0022] (5) The device of the present invention is easy to carry, flexible and practical. The device has an integrated design, digital display, is compact and light, easy to carry, flexible and practical, and can replace the original scattered equipment such as pressure gauges, valves, flow meters, flow control valves, etc.

[0023] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0025] Figure 1 This is a block diagram of the overall structure of the flow linear automatic regulation control device of the present invention;

[0026] Figure 2 This is a schematic diagram of the installation of the flow linear automatic regulation control device of the present invention. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0028] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0029] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is 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 operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] See also Figure 1-2 The embodiment of the present invention provides a flow linear automatic adjustment control device for coal mine gas sensor calibration, which is mainly composed of a host, a flow detection unit, a flow automatic adjustment control unit, a power supply unit, etc. The flow detection unit and the flow automatic adjustment control unit are respectively placed on the left and right sides of the host housing, and the left and right sides of the host housing are respectively provided with latches to facilitate fixing the sensor and the driver, and the stainless steel gas pipe is placed under the host housing.

[0031] The host includes a modular motherboard, a main housing, an LCD display, panel buttons, etc. The flow detection unit includes an air chamber, a front-end flow detection micro-probe, a front-end flow detection sensor, a rear-end flow detection micro-probe, and a rear-end flow detection sensor. The automatic flow control unit includes a front-end automatic flow control valve, a front-end driver, a rear-end automatic flow control valve, a rear-end driver, and a stainless steel air pipe.

[0032] The modular motherboard is fixed to the back plate of the main case by screws, and the LCD screen is fixed to the front plate of the main case by screws. The LCD screen and the modular motherboard are connected by precision soft cables. The panel buttons are made of a film panel, which is pasted on the outside of the front plate of the main case. The film panel includes "Set", "Up", "Down", "OK", and "Switch" buttons. The film panel and the modular motherboard are connected by precision soft cables.

[0033] The standard gas sample bottle and the gas chamber of the flow detection unit are directly connected with a standard nut. Make a micro hole on the gas chamber and the stainless steel gas pipe, insert the flow detection micro probe rod and the flow detection sensor temperature probe into the 1 / 2 position of the gas chamber tube inner diameter, and use epoxy structural adhesive to make a good seal. The flow detection micro probe rod and the flow detection sensor are directly connected, and the collected signal directly enters the sensor. The flow detection sensor and the host are connected with a 4-core cable (2 cores for power supply and 2 cores for signal line). An automatic flow control valve is installed between the gas chamber and the stainless steel gas pipe and at the output end of the stainless steel gas pipe. The automatic flow control valve and the upper driver are connected with a 4-core cable (2 cores for power supply and 2 cores for control line). The rear-end automatic flow adjustment control valve is connected to the sensor gas chamber with a hose for easy on-site adjustment.

[0034] There are pins on the left and right sides of the host housing, which are used in conjunction with the flow detection sensor and the driver housing to facilitate the fixing of the sensor and the driver. A micro hole is drilled on the left and right sides of the host housing to arrange the signal cables for power supply, data transmission, control and other functions between the host motherboard and the flow detection sensor and the driver. The hole is sealed with a rubber pad.

[0035] Use the panel buttons to preset flow target value, dwell time at target value, flow rate and other parameters.

[0036] Before adjustment, use the power adapter to fully charge the host battery, set the relevant parameters according to the flow requirements of various sensors. For example, to adjust the low-concentration methane sensor, first enter the function setting through the panel setting button, preset the flow target value of 200ml / min, and then set the dwell time at the target value to 90s. The flow rate increases in steps at a rate of 10ml / s.

[0037] During calibration, open the valve of the standard gas sample bottle, and the standard gas sample flows into the gas chamber. When the front-end flow detection probe detects that there is fluid passing through, the collected signal is uploaded to the front-end flow detection sensor. The front-end flow detection sensor converts, amplifies, calculates, and processes the signal and then uploads it to the host. After receiving the signal, the host issues an instruction to start the front-end automatic flow control valve. The front-end driver executes the instruction, and the front-end automatic flow control valve starts according to the instruction. At this time, the gas flows through the stainless steel gas pipe, and the rear-end flow detection micro-probe detects that there is fluid passing through. The signal is also gradually uploaded to the host. After receiving the signal, the host issues an instruction to start the rear-end automatic flow control valve. The rear-end driver executes the instruction, and the rear-end automatic flow control valve starts according to the instruction. The gas flows to the sensor gas chamber through the hose to achieve the calibration of the sensor. At the same time, the host collects the temperature, pressure, pressure difference and other parameters of the rear-end flow detection sensor, calculates the instantaneous flow and cumulative flow of the gas through the rear-end automatic flow control valve, and displays the real-time temperature, pressure and other parameters monitored on the host LCD screen.

[0038] When the adjustment time reaches the preset duration, the host first sends an instruction to close the front-end automatic flow regulating valve, the front-end driver executes the instruction, and the front-end automatic flow regulating valve is gradually closed. After the front-end automatic flow regulating valve is closed, the host sends an instruction to close the back-end automatic flow regulating valve, the back-end driver executes the instruction, and the back-end automatic flow regulating valve is gradually closed. The instantaneous flow, air pressure stability time, air pressure change and other parameters are used to determine whether the adjustment is successful. If successful, "success" will be displayed on the display screen, otherwise "failure" is displayed and it needs to be re-calibrated or the gas sample bottle is replaced for re-adjustment.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A flow linear automatic regulation control device for coal mine gas sensor calibration, characterized in that: The device comprises a flow detection unit, an automatic flow adjustment control unit, a host and a power supply unit; the flow detection unit comprises an air chamber, a front-end flow detection micro-probe, a rear-end flow detection micro-probe, a front-end flow detection sensor and a rear-end flow detection sensor; the automatic flow adjustment control unit comprises a front-end automatic flow adjustment valve, a rear-end automatic flow adjustment valve, a front-end driver, a rear-end driver and a stainless steel air pipe; The standard gas sample bottle is directly connected to the gas chamber, one end of the front-end flow detection micro probe is inserted into the gas chamber, and the other end is connected to the front-end flow detection sensor. The front-end flow detection sensor converts, amplifies, calculates and processes the detection signal, and then inputs the processed signal into the host; One end of the rear-end flow detection micro-probe is inserted into the trachea, and the other end is connected to the rear-end flow detection sensor. The rear-end flow detection sensor converts, amplifies, calculates and processes the detection signal, and then inputs the processed signal into the host; A front-end automatic flow regulating valve is installed between the air chamber of the flow detection unit and the input end of the stainless steel air pipe, the front-end automatic flow regulating valve is connected to the front-end driver, and the front-end driver is connected to the host; a rear-end automatic flow regulating valve is installed at the output end of the stainless steel air pipe, the rear-end automatic flow regulating valve is connected to the rear-end driver, and the rear-end driver is connected to the host; the rear-end automatic flow regulating valve is connected to the air chamber of the sensor to be calibrated.

2. The flow rate linear automatic regulation control device according to claim 1 is characterized in that: The installation method of the front-end flow detection micro-probe is as follows: a micro-hole is made above the air chamber according to the size of the front-end flow detection micro-probe, and then the probe is inserted into the position of 1 / 2 of the inner diameter of the air chamber, and effectively sealed; The installation method of the rear-end flow detection micro-probe is: according to the size of the rear-end flow detection micro-probe, a micro-hole is made on the stainless steel air pipe, and then the probe is inserted into the 1 / 2 position of the inner diameter of the air pipe, and effectively sealed.

3. The flow rate linear automatic regulation control device according to claim 1, characterized in that: When the front-end flow detection micro-probe detects that there is fluid flowing through the air chamber, a high-pressure distribution area is generated in the front of the probe in the flow direction, and a low-pressure distribution area is generated in the back of the probe in the back flow direction. The front-end flow detection sensor arranges multiple pairs of pressure holes in the high and low pressure areas according to rules to measure the total pressure and static pressure of the fluid respectively. The front-end flow detection sensor converts, amplifies and processes the measured pressure signal and uploads it to the host. After the host receives the signal from the front-end flow detection sensor, the host sends a command to the front-end driver to start the front-end automatic flow regulation valve. The front-end driver starts to execute the startup program according to the preset parameters, gradually opens the front-end automatic flow regulation valve, and the standard gas sample enters the stainless steel air pipe.

4. The flow rate linear automatic regulation control device according to claim 1, characterized in that: When the rear-end flow detection micro-probe detects fluid flowing through the stainless steel air pipe, a high-pressure distribution area is generated in the front part of the rear-end flow detection micro-probe in the flow-facing direction, and a low-pressure distribution area is generated in the rear part of the probe in the back-flow direction. The rear-end flow detection sensor has multiple pairs of pressure holes arranged in a regular pattern in the high and low pressure areas to measure the total pressure and static pressure of the fluid respectively. The rear-end flow detection sensor converts, amplifies and processes the measured pressure signal and uploads it to the host. After the host receives the signal from the rear-end flow detection sensor, the host sends a command to the rear-end driver to start the rear-end automatic flow regulation valve. The rear-end driver starts to execute the startup procedure according to the preset parameters, gradually opens the rear-end automatic flow regulation valve, and the standard gas sample enters the air chamber of the sensor to be adjusted through the hose, thereby realizing automatic adjustment of the sensor.

5. The flow rate linear automatic regulation control device according to claim 1, characterized in that: The host includes a modular mainboard, a main housing, a display screen and panel buttons; the flow detection unit and the automatic flow adjustment control unit are respectively placed on the left and right sides of the main housing, and the left and right sides of the main housing are respectively provided with latches to facilitate fixing the sensor and the driver, and the stainless steel air pipe is placed under the main housing; the modular mainboard is fixed in the rear plate of the main housing, the display screen is fixed in the front plate of the main housing, and the display screen and the modular mainboard are connected by a soft flat cable; the panel buttons are pasted on the outside of the front plate of the main housing, and the film panel and the modular mainboard are connected by a soft flat cable.

6. The flow rate linear automatic regulation control device according to claim 5, characterized in that: The power supply unit includes multiple lithium batteries and a charge-discharge conversion circuit; the multiple lithium batteries form a battery pack, and the battery pack is placed under the modular mainboard. Before use, an external DC power supply charges the lithium batteries through the charge-discharge conversion circuit. During use, the lithium batteries are discharged through the charge-discharge conversion circuit to power the host, the flow detection unit and the automatic flow adjustment control unit.

7. The flow rate linear automatic regulation control device according to any one of claims 1 to 6, characterized in that: During calibration, open the valve of the standard gas sample bottle, and the standard gas sample flows into the gas chamber. When the front-end flow detection probe detects that there is fluid passing through, the collected signal is uploaded to the front-end flow detection sensor. The front-end flow detection sensor converts, amplifies, calculates and processes the signal and then uploads it to the host. After receiving the signal, the host issues an instruction to start the front-end automatic flow regulating valve, and the front-end driver executes the instruction, and the front-end automatic flow regulating valve is started according to the instruction. At this time, the gas flows through the stainless steel gas pipe, and the rear-end flow detection micro-probe detects that there is fluid passing through, and also gradually uploads the signal to the host. After receiving the signal, the host issues an instruction to start the rear-end automatic flow regulating valve, and the rear-end driver executes the instruction, and the rear-end automatic flow regulating valve is started according to the instruction. The gas flows to the sensor gas chamber through the hose to achieve the calibration of the sensor. At the same time, the host calculates the instantaneous flow and cumulative flow of the gas through the rear-end automatic flow regulating valve by collecting the temperature, pressure and pressure difference of the rear-end flow detection sensor, and displays the real-time temperature and pressure monitored on the host display. When the adjustment time reaches the preset duration, the host first sends an instruction to close the front-end automatic flow regulating valve, the front-end driver executes the instruction, and the front-end automatic flow regulating valve is gradually closed. After the front-end automatic flow regulating valve is closed, the host sends an instruction to close the back-end automatic flow regulating valve, the back-end driver executes the instruction, and the back-end automatic flow regulating valve is gradually closed. The instantaneous flow, air pressure stability time and air pressure change are used to determine whether the adjustment is successful. If successful, "success" will be displayed on the screen, otherwise "failure" is displayed, and re-adjustment or replacement of the gas sample bottle is required for re-adjustment.

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