CN217385207U - Gas detector overhauls device - Google Patents

Abstract

The utility model relates to a gas detector overhaul device, which comprises a gas alarm, a gas detector and a calibration cover, wherein the gas detector to be detected is sealed in the calibration cover, the calibration cover and a second gas alarm are fixed in an isolation cabin, and an exhaust fan is connected with a gas processor and is arranged at the top of the isolation cabin; the gas cylinder and the calibration gas supply valve are sealed by the sealing box body, and a first gas alarm is fixed in the sealing box body; the components such as the calibration gas supply valve are connected with a power supply through power supply cables and are connected with the PLC through automatic control signal cables; connecting a detection interface of the gas detector with the PLC through an automatic control signal cable; the PLC is connected with the computer and the power supply in sequence through a power supply cable. The device can be used for overhauling and calibrating the gas detectors of an offshore oil production platform, oil and gas gathering and transportation and various high-risk mines, and solves the problems that the maintenance and inspection of the gas detectors are limited by flammable and explosive working environments and do not have professional overhauling devices.

Description

Gas detector overhauls device

Technical Field

The utility model relates to a gas detector's maintenance and calibration equipment, especially a gas detector overhauls device.

Background

The gas detector is a common safety monitoring device in oil and gas production places, can convert a gas concentration value into an electric signal to play a role in monitoring the concentration, and can automatically start the alarm device after the gas in a detected space reaches a certain concentration, so that the gas detector can play a good role in alarming and preventing oil and gas leakage accidents, and the occurrence rate of major safety accidents such as fire disasters, explosions and the like can be reduced.

The gas detector is widely applied to offshore oil production platforms, is arranged in key places where oil and gas are easy to leak or gather, such as well heads, process decks, workover rigs, power transformation and distribution rooms and the like of the platforms, and plays an important role in safe operation of the platforms.

Currently, gas detectors in common use can be classified into 3 types according to the working principle of the detector: catalytic combustion type, semiconductor type, and infrared optical type. Among them, the infrared optical gas detector is widely used on the offshore oil production platform with severe environment because of its characteristics of better long-term stability, insensitive to flow rate, insensitive to polymerization and corrosive substances and catalyst poisons, etc. The infrared optical gas sensor adopts the infrared absorption spectrum principle and utilizes the characteristic that gases with different components have selectivity in specific absorption bands with respective wavelengths to measure. The gas in the detected space enters a measuring cuvette of the infrared optical gas detector in a diffusion mode, and the suction force passing through the splash guard is generated through heat generation, namely the chimney effect. The infrared radiation source generates a wide radiation band, the wide radiation band penetrates out of the sapphire window, the wide radiation band passes through the measuring cuvette twice, and radiation is guided into the optical module and the detector through mirror reflection; whereas the target gas in the environment causes the radiation to be absorbed at the measurement wavelength, which changes the signal of the measurement detector. The measuring sensor in the gas detector converts the gas concentration value into a 4-20mA electric signal, and the electric signal is transmitted to the central control room through the host machine, so that the function of monitoring the field gas concentration is achieved.

Because the environment of the offshore oil production platform is relatively severe, the failure rate of the gas detector of the offshore oil production platform is continuously increased along with the increase of the service life, and the normal operation of the gas monitoring system is seriously influenced, so that the safety hazard occurs in the daily production and life of the offshore oil production platform.

Through the research and analysis of the faults of the offshore oil production platform gas detector in recent years, the fault types and the corresponding maintenance processing methods are summarized as follows: (1) environmental impact type failure: the faults are mainly the problems that the gas detector is aged and damaged and the like caused by the fact that the offshore oil production platform is often in severe marine environments such as strong wind, strong insolation, fog and humidity. The method mainly comprises the faults of power supply line aging of the gas detector, dirt blocking of a light source probe lens, aging and damage of a reflective lens, failure of probe detection and the like.

(2) Vulnerable fault of the accessory: during the use process of the offshore oil production platform, the gas detector can find that some parts which are easy to damage or need to be replaced frequently exist, and the damage of the parts can cause the gas detector to lose the normal monitoring and alarming functions. By analyzing the fault maintenance condition of the gas detector in recent years, the fault that the parts of the gas detector are easy to damage is mainly found out by the damage of the main circuit board element and the faults of the infrared light source emitter and the built-in sensor.

(3) And (3) system type fault: the gas detector mainly has faults of wrong instrument display code, false channel card alarm, non-return-to-zero concentration display value, large deviation and the like in the using process, and is mainly caused by misoperation of a user or lack of regular calibration and maintenance of the instrument.

In order to improve the normal utilization rate of the offshore oil production platform gas detector, common faults of the gas detector need to be analyzed and sorted, and autonomous maintenance and repair of instruments are carried out. Aiming at the easily damaged faults of the gas detector fittings, the fault detector is detected by utilizing the maintenance equipment, normal fittings are screened and reserved, and a fitting library is established, so that the corresponding fault fittings of the gas detector of the oil extraction platform can be conveniently replaced, the gas detector can be quickly repaired, and the problem of overhigh maintenance cost caused by integral replacement is solved. Aiming at the fault that the concentration display value does not return to zero or has large deviation, professional maintenance personnel need to be organized in time to recalibrate the alarm value of the gas detector in the standard sample gas or calibrate the zero point under the clean air. The repaired gas detector needs to use calibration gas to calibrate and correct the zero point, reasonably set the detection value of the sensor, monitor the operation curve in a specified time period and ensure the reliability of the alarm function of the self-repairing combustible gas alarm system.

At present, the overhauling and calibrating device related to the gas detector is provided with: the application number is CN201420486320.8 discloses a gaseous calibration device of infrared gas detector, including maring the barrel and setting up air inlet, gas outlet, preceding demarcation window, the back demarcation window on maring the barrel, still include air inlet cock end cap and gas outlet cock end cap, preceding demarcation window and back demarcation window are fixed respectively and are set up in the both ends of maring the barrel, and air inlet and gas outlet set up on maring the barrel, when maring the barrel and full demarcation gas in, seal it with the cock end cap. When the infrared gas detector is calibrated, the calibration cylinder filled with calibration gas is fixed on a detection light path of the gas detector when gas needs to be introduced, and the introduction of the calibration gas is simulated to finish gas calibration. Above-mentioned utility model can solve the gaseous mark of current infrared gas detector and constantly inject into gas in the light path of maring to spread the problem of air, reduced the pollution of air, mark the device simultaneously and can use repeatedly, also the effectual cost of practicing thrift gaseous mark.

Above-mentioned utility model will mark the barrel and install on infrared gas detector's detection light path, mark the detector, reduce and mark gaseous output diffusion and air pollution. But still has the following disadvantages relative to gas detector maintenance: the device can only finish the calibration of the gas detector, and cannot judge the specific fault position of the gas detector. The gas detector can not automatically mix to generate calibration gas with a certain concentration, and gas with continuous concentration needs to be injected from the outside, and the operation condition of the gas detector can not be monitored. The concentration of the injected gas cannot be compared with the display concentration of the detector, and the residual calibration gas cannot be subjected to harmless treatment. When the gas is used, no detection alarm equipment exists, and certain potential safety hazards exist.

Gas detectors require maintenance equipment to service their maintenance and calibration.

Disclosure of Invention

The utility model aims at providing a gas detector overhauls device, for gas detector's maintenance and calibration service, make things convenient for its operation to maintain, improve gas detector's intact rate and normal use rate, reduce cost of maintenance.

The technical solution of the utility model is that: the utility model provides a gas detector overhauls device includes gas alarm, gas detection appearance and marks the cover, wherein: the gas detector to be detected is sealed in the calibration cover, the calibration cover and the gas alarm device II are fixed in the isolation cabin, and the exhaust fan is connected with the gas processor and is installed at the top of the isolation cabin; the gas cylinder and the calibration gas supply valve are sealed by the sealing box body, and a first gas alarm is fixed in the sealing box body; the gas mixer and the gas diffuser are arranged in the gas inlet box, and the pressure transmitter and the gas detector I are arranged at the top of the gas inlet box; the gas cylinder is filled with high-purity calibration gas and is connected with a calibration gas inlet of the gas diffuser through a calibration gas supply valve and a gas inlet pipeline; the air inlet machine is sequentially connected with the external air regulating valve and the external air inlet of the air diffuser; the gas mixer is sequentially connected with the gas inlet and the gas outlet of the calibration cover and the gas processor through a gas outlet pipeline; a detection port of the gas outlet pipeline in the isolation cabin is connected with a second gas detector; the calibration gas supply valve, the first gas alarm, the air inlet machine, the external air regulating valve, the pressure transmitter, the first gas detector, the exhaust fan, the gas processor, the second gas alarm and the second gas detector are respectively connected with the power supply by adopting power supply cables and are also respectively connected with the PLC by adopting automatic control signal cables; connecting a detection interface of the gas detector with the PLC through an automatic control signal cable; the PLC is connected with the computer and the power supply in sequence through a power supply cable.

Preferably, the power supply is a mobile power supply.

Preferably, the isolation cabin is provided with a sealed detection cabin and an operation control cabin, and a partition plate is arranged between the sealed detection cabin and the operation control cabin; the calibration cover, the second gas alarm and the second gas detector are all arranged in the sealed detection cabin on the upper portion, and the PLC, the computer and the mobile power supply are all arranged in the operation control cabin on the lower portion.

Preferably, the gas cylinder sealed by the sealing box body, the calibration gas supply valve, the gas inlet box and the isolation cabin are all fixed on the gas cylinder truck.

Preferably, the sealed detection cabin is provided with a roller shutter type visible cabin door, and the roller shutter type visible cabin door is clamped in the sealed sliding rails on two sides of the sealed detection cabin.

Preferably, the calibration cover is a conical cover, the small-diameter end of the calibration cover is closed, the inner cavity of the large-diameter end of the calibration cover is provided with a sealing ring, and the inner diameter of the sealing ring is smaller than the outer diameter of the gas detector.

Preferably, at least one sealing ring is arranged in the calibration cover.

Preferably, the exhaust fan is installed at the top of the sealed detection cabin, an air inlet of the exhaust fan is communicated with the sealed detection cabin, and an air outlet of the exhaust fan is communicated with an air inlet of the gas processor through an air outlet pipeline; and an air outlet pipeline from the calibration cover is connected in an air outlet pipeline between the exhaust fan and the gas processor.

Preferably, the calibration gas supply valve and the outside air regulating valve are both electric regulating valves.

Compared with the prior art, the utility model has the advantages that: the utility model discloses can overhaul and mark the gas detector of defeated and all kinds of high-risk mines of ocean oil production platform, oil gas production, oil gas collection. The device can uniformly diffuse target gas and mix the target gas with air to generate calibration gas with certain concentration, and the calibration gas is introduced into the gas detector, so that the operation curve of the gas detector can be monitored, and the fault point of the detector can be judged.

After the gas detector is accurately repaired, the calibration gas can be used for zero calibration and sensitivity calibration of the detector. After the repair is finished, the detector can be subjected to test operation and the operation state can be monitored through the device, and the detector is ensured to stably operate after being installed and used.

This device has gas leakage warning and harmful gas processing function, can monitor whether gas leaks in the sealed detection cabin of gas cylinder and isolation cabin, and the waste gas after detecting the use is innocent treatment through the gas treater, has effectively avoided staff's operational risk, has protected the environment.

The gas cylinder vehicle in the device can bear and fix the gas cylinder and other parts to move around, and detection work is facilitated. The portable power source is used in the device, the working risk of the circuit is reduced, and a plurality of adverse factors of temporary power utilization risk, cable length limitation and large laying and recycling workload are avoided. After the roller shutter type visible cabin door is closed, the gas detector is isolated from the outside, and the PLC controls the stable operation of the whole set of maintenance device, monitors the operation data of the detector and judges the fault position.

The gas regulating and detecting and alarming part, the air inlet and exhaust part and the pressure transmitter in the device are all connected with a PLC (programmable logic controller), and the PLC automatically operates according to the pressure and the concentration of the calibration gas according to a preset program to carry out ventilation detection on the gas detector. The gas detectors in the gas inlet box and the sealed detection cabin can compare numerical values in an inlet and an outlet of the standard gas in the device with numerical values of gas in the gas detector, and comprehensively judge the operation condition and the fault position of the gas detector according to an operation curve in the gas detector. The computer receives the display signal, controls the PLC through an edited program and stores data for overhauling and monitoring the detector, so that the management level of a maintenance site is improved, and meanwhile, the development of the fault statistics management work of the detector is facilitated.

The device changes the current situation that the fault detection method of the existing gas detector and the equipment have low working efficiency, has small volume, is convenient for on-line maintenance in various workplaces, and successfully solves the problems that the maintenance and the inspection of the gas detector are limited by flammable and explosive working environments and do not have professional maintenance devices.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings: fig. 1 is an expanded schematic view of the working principle and structure of the present invention.

In the figure: the gas detection device comprises a gas cylinder truck 1, a gas cylinder 2, a calibration gas supply valve 3, a first gas alarm 4, an air inlet machine 5, an external air regulating valve 6, a gas diffuser 7, a pressure transmitter 8, a first gas detector 9, a gas mixer 10, an air inlet box 11, an isolation cabin 12, a visible cabin door 13, an exhaust fan 14, a gas processor 15, a calibration cover 16, a sealing ring 17, a computer 18, a mobile power supply 19, a PLC20, a second gas alarm 21 and a second gas detector 22.

Detailed Description

The drawings are for reference and illustration purposes only and are not intended to limit the scope of the present disclosure. The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. In addition, in the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1, a gas detector servicing apparatus includes a gas alarm, a gas detector and a calibration cover 16, wherein: the detected gas detector is sealed in a calibration cover 16, the calibration cover 16 and a second gas alarm 21 are fixed in the isolation cabin 12, and the exhaust fan 14 is connected with the gas processor 15 and is installed at the top of the isolation cabin 12; the gas cylinder 2 and the calibration gas supply valve 3 are sealed by a sealing box body, and a first gas alarm 4 is fixed in the sealing box body; a gas mixer 10 and a gas diffuser 7 are arranged in the gas inlet box 11, and a pressure transmitter 8 and a gas detector I9 are arranged at the top of the gas inlet box 11; the gas cylinder 2 is filled with high-purity calibration gas, and the gas cylinder 2 is connected with a calibration gas inlet of a gas diffuser 7 through a calibration gas supply valve 3 and a gas inlet pipeline; the air inlet fan 5 is connected with an external air regulating valve 6 and an external air inlet of the gas diffuser 7 in sequence; the gas mixer 10 is connected with a gas inlet and a gas outlet of the calibration hood 16 and the gas processor 15 in sequence through a gas outlet pipeline; a second gas detector 22 is connected with a detection port of the gas outlet pipeline in the isolation cabin 12; the calibration gas supply valve 3, the first gas alarm 4, the air inlet fan 5, the external air regulating valve 6, the pressure transmitter 8, the first gas detector 9, the exhaust fan 14, the gas processor 15, the second gas alarm 21 and the second gas detector 22 are respectively connected with a power supply through power supply cables and are also respectively connected with the PLC20 through automatic control signal cables; connecting a detection interface of the gas detector with the PLC20 through an automatic control signal cable; the PLC20 is in series with the computer 18 and power supply via power cables.

The utility model provides a centralized maintenance device for the maintenance of the gas detector, and the PLC in the device can be used for programming a logic editor; the calibration gas supply valve 3, the gas alarm, the outside air regulating valve 6, the pressure transmitter 8 and the gas detector in the device can be purchased in the market, and the PLC20 can be ordered according to manufacturers.

The gas cylinder 2 is arranged in the sealed box body, and the gas alarm device 4 is fixed in the sealed box body, so that the device can be used in on-line detection and narrow and closed space.

The gas cylinder 2 is filled with calibration gas, and the gas detector is sealed in the calibration cover 16. The device can uniformly diffuse and mix high-purity calibration gas in the gas cylinder 2 and external air through the gas diffuser 7 and the gas mixer 10, and then send the calibration gas with certain concentration into the gas detector. The calibration gas in the gas cylinder 2 and the doped outside air enter the gas inlet box 11 through the gas diffuser 7, and the two gases are uniformly mixed through the gas mixer 10. The first gas detector 9 feeds back a gas concentration signal in the gas inlet box 11 to the PLC20, and the PLC20 adjusts the opening degrees of the calibration gas supply valve 3 and the outside air adjusting valve 6 according to the calibration gas concentration value set by the computer 18, so as to ensure that the gas concentration value in the gas inlet box 11 is kept at a set value. When the first gas alarm 4 gives an alarm, the PLC20 controls the calibration gas supply valve 3 to be closed, and when the second gas alarm 21 gives an alarm, the exhaust fan 14 is started, and the gas in the isolation cabin 12 is subjected to harmless treatment through the gas processor 15 and then is exhausted. The gas in the gas inlet box 11 enters the gas inlet of the calibration cover 16, circulates in the gas detector, enters the gas processor 15 from the gas outlet of the calibration cover 16, is subjected to harmless treatment, and is discharged. The second gas detector 22 detects the gas concentration and transmits a signal to the PLC20, the PLC20 feeds back the gas concentration value to the computer 18, and the program screen of the computer 18 confirms that the gas concentrations at the gas outlets of the gas inlet box 11 and the calibration cover 16 are the same.

The computer 18 generates an operation indication curve according to the operation data signal of the gas detector fed back by the PLC20, the computer 18 judges the working condition of the gas detector according to a gas detector fault database prestored in the computer 18, the fault position of the detector is determined and displayed on a screen of the computer 18, and the gas detector is disassembled and maintained by operation and maintenance personnel. After the maintenance of the gas detector is completed and the monitoring is normal within the specified time, calibration gas with various concentrations is set on the computer 18, and the zero point and the sensitivity of the gas detector are calibrated.

On the basis of the first embodiment, the utility model discloses still have following embodiment:

the power supply is a mobile power supply 19, and the use is convenient.

The isolation cabin 12 is provided with a sealed detection cabin and an operation control cabin, and a partition plate is arranged between the sealed detection cabin and the operation control cabin; the calibration cover 16, the second gas alarm 21 and the second gas detector 22 are all arranged in a sealed detection cabin at the upper part, and the PLC20, the computer 18 and the mobile power supply 19 are all arranged in an operation control cabin at the lower part, so that the safety is ensured, and the operation and the use are convenient.

The gas cylinder 2 sealed by the sealing box body, the calibration gas supply valve 3, the gas inlet box 11 and the isolation cabin 12 are all fixed on the gas cylinder trolley 1. The utility model discloses a gas cylinder car 1 loads the removal, makes gas detector's maintenance and detection more convenient.

The sealed cabin that detects is equipped with roll up visual hatch door 13 of curtain formula, roll up visual hatch door 13 card of curtain formula and detect in the sealed slide rail of cabin both sides. The roller shutter type visible cabin door 13 is made of transparent materials, so that the detection condition in the sealed detection cabin can be conveniently observed.

The calibration cover 16 is a conical cover, the small-diameter end of the calibration cover 16 is closed, the inner cavity of the large-diameter end is provided with a sealing ring 17, and the inner diameter of the sealing ring 17 is smaller than the outer diameter of the gas detector. The gas detector is held in the calibration cap 16 by a sealing ring 17.

At least one sealing ring 17 is arranged in the calibration cover 16.

The exhaust fan 14 is installed at the top of the sealed detection cabin, an air inlet of the exhaust fan 14 is communicated with the sealed detection cabin, and an air outlet of the exhaust fan 14 is communicated with an air inlet of the gas processor 15 through an air outlet pipeline; the outlet line from the calibration hood 16 is connected in the outlet line between the exhaust fan 14 and the gas handler 15. When the second gas alarm 21 in the sealing detection chamber alarms, the PLC20 controls the exhaust fan 14 to start working.

The calibration gas supply valve 3 and the outside air regulating valve 6 are both electric regulating valves.

Before the device is used, a mobile power supply 19 is used for supplying power to a PLC20, a computer 18, a first gas alarm 4, a second gas alarm 21, an exhaust fan 14, a first gas detector 9, a second gas detector 22, a pressure transmitter 8, an external air regulating valve 6, an air inlet fan 5 and a calibration gas supply valve 3, so that the normal display operation of the equipment and the instruments is confirmed.

The sealing ring 17 is checked to be installed perfectly and has no aging phenomenon, the calibration cover 16 is covered on the gas detector to be overhauled, the visible cabin door 13 is pulled downwards to be closed, the sealing detection cabin in the isolation cabin 12 is ensured to be in a sealing state, and the automatic control signal cable of the PLC20 is connected with the detection interface of the gas detector.

Looking at the computer 18, confirming that the gas detector is in an operating state, setting a value of the desired calibration gas concentration in the program screen of the computer 18, the computer 18 issuing a command to the PLC20 to begin detecting and calibrating the gas detector.

After calibration of the gas detector is completed, the detailed information of the gas detector and the maintenance calibration record are stored in the computer 18.

The embodiments described above are merely exemplary embodiments, but the present invention is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and teaching of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and modifications can be made, and equivalents can be substituted for elements thereof. Any modification, equivalent replacement, improvement and the like made within the spirit and the concept of the present invention should be included in the protection scope of the present invention. The scope of protection is therefore not limited to the description above.

Claims (9)

1. The utility model provides a gas detector overhauls device, includes gas alarm, gas detection appearance and marks cover, characterized by: the gas detector to be detected is sealed in the calibration cover, the calibration cover and the gas alarm device II are fixed in the isolation cabin, and the exhaust fan is connected with the gas processor and is installed at the top of the isolation cabin; the gas cylinder and the calibration gas supply valve are sealed by the sealing box body, and a first gas alarm is fixed in the sealing box body; the gas mixer and the gas diffuser are arranged in the gas inlet box, and the pressure transmitter and the gas detector I are arranged at the top of the gas inlet box; the gas cylinder is filled with high-purity calibration gas and is connected with a calibration gas inlet of the gas diffuser through a calibration gas supply valve and a gas inlet pipeline; the air inlet machine is sequentially connected with the external air regulating valve and the external air inlet of the air diffuser; the gas mixer is sequentially connected with the gas inlet and the gas outlet of the calibration cover and the gas processor through a gas outlet pipeline; a detection port of the gas outlet pipeline in the isolation cabin is connected with a second gas detector; the calibration gas supply valve, the first gas alarm, the air inlet machine, the external air regulating valve, the pressure transmitter, the first gas detector, the exhaust fan, the gas processor, the second gas alarm and the second gas detector are respectively connected with the power supply by adopting power supply cables and are also respectively connected with the PLC by adopting automatic control signal cables; connecting a detection interface of the gas detector with the PLC through an automatic control signal cable; the PLC is connected with the computer and the power supply in sequence through a power supply cable.

2. The gas detector service device of claim 1, wherein the power source is a portable power source.

3. The gas detector maintenance device of claim 2, wherein the isolation chamber is provided with a sealing detection chamber and an operation control chamber, and a partition plate is arranged between the sealing detection chamber and the operation control chamber; the calibration cover, the gas alarm and the gas detector are all arranged in the sealed detection cabin on the upper portion, and the PLC, the computer and the mobile power supply are all arranged in the operation control cabin on the lower portion.

4. A gas detector service device as claimed in claim 3, wherein the gas cylinder sealed by the sealed box body and the calibration gas supply valve, the gas inlet box and the isolation chamber are all fixed on the gas cylinder truck.

5. The gas detector service device as claimed in claim 3, wherein the sealed inspection chamber is provided with a roller shutter type visual door, and the roller shutter type visual door is clamped in the sealing slide rails at both sides of the sealed inspection chamber.

6. The gas detector servicing device of claim 1, wherein the calibration cap is a conical cap, and the inner cavity of the small-diameter end and the large-diameter end of the calibration cap is provided with a sealing ring, and the inner diameter of the sealing ring is smaller than the outer diameter of the gas detector.

7. A gas detector service device as claimed in claim 6, wherein at least one sealing ring is provided for mounting within the calibration cap.

8. The gas detector overhauling device as recited in claim 3, wherein the exhaust fan is installed at the top of the sealed detection chamber, the air inlet of the exhaust fan is communicated with the sealed detection chamber, and the air outlet of the exhaust fan is communicated with the air inlet of the gas processor through an air outlet pipeline; and an air outlet pipeline from the calibration cover is connected in an air outlet pipeline between the exhaust fan and the gas processor.

9. The gas detector service apparatus of claim 1, wherein said calibration gas supply valve and said outside air regulating valve are electrically operated regulating valves.

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