Pit oxygen concentration automatic point inspection device and point inspection method thereof

Abstract

The invention aims to provide a pit oxygen concentration automatic point inspection device and a point inspection method thereof.The pit oxygen concentration automatic point inspection device comprises a power distribution box arranged on a pit, a central control mechanism is arranged on the power distribution box, a gas conveying mechanism, a detection mechanism and an exhaust mechanism which are used in cooperation with the power distribution box are arranged on the pit, the detection mechanism is installed in the pit, and the exhaust mechanism is installed in the pit. The device has the beneficial effects that under the control of the central control mechanism, through the arrangement of the argon conveying pipe and the oxygen concentration sensor, automatic point inspection of the pit oxygen concentration can be realized, the oxygen concentration sensor can monitor the pit oxygen concentration in real time, and the detection accuracy is improved. And the opening of the three-way joint pipe can be controlled by starting the electromagnetic valve, so that argon enters the pit through the argon conveying pipe, an argon atmosphere is formed near the oxygen concentration sensor, whether the working state of the oxygen concentration sensor is abnormal or not is judged, manual detection is not needed, and the operation risk is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of pit safety detection, and in particular relates to an automatic spot detection device for pit oxygen concentration and a spot detection method thereof. Background Art

[0002] At present, with the rapid development and rise of my country's industry, a lot of large-scale machinery and equipment have appeared accordingly. These large-scale machinery and equipment are huge in size and will take up a lot of space when installed. In response to the production needs of the factory area, many operations need to be carried out in indoor workshops. The space in indoor workshops is difficult to meet the installation of large-scale machinery and equipment. Even if it can be installed, the remaining operating space is also very limited. Therefore, people will install large-scale machinery and equipment in pits by digging pits indoors. In this way, for workshops with limited height, pit installation can effectively reduce the vertical space required for large-scale machinery and equipment, making the workshop layout more reasonable. The indoor pit is a limited space with a complex internal space and narrow entrances and exits. It has the defect of being difficult to ventilate. The oxygen content in the air is about 21%. The original indoor oxygen concentration is lower than that outdoors, and the pit is a pit down from the ground, so the oxygen content in the pit will be lower. The environment with an oxygen content of less than 19.5% in the air in the workplace is considered It is an oxygen-deficient environment. If the oxygen content in the pit is lower than 19.5% when the operator goes down to work, there may be a risk of coma or even death due to lack of oxygen. Therefore, it is necessary to detect the oxygen concentration when working in a limited space. The common pit oxygen concentration detection method is to install an oxygen concentration sensor under the pit, and use the oxygen concentration sensor to monitor the oxygen concentration value in the pit in real time. However, the oxygen concentration sensor may fail in long-term operations. If the oxygen concentration sensor fails, the detected oxygen content will be inaccurate, and there will be safety hazards. In order to ensure that the oxygen concentration sensor can monitor the oxygen concentration value in the pit in real time, it is necessary to determine whether the oxygen concentration sensor is working properly. The existing method for detecting whether the oxygen concentration sensor is working properly is to manually carry a balloon filled with nitrogen into the pit and release nitrogen near the oxygen concentration sensor to dilute the oxygen concentration to detect whether the oxygen concentration sensor is normal. However, this detection method has many disadvantages: 1. High operational risk. The oxygen concentration sensor itself has the risk of failure. It is also necessary to manually carry a balloon filled with nitrogen into the pit. Releasing nitrogen in a limited space increases the safety risk of the operator. 2. The detection efficiency is low. Before the detection, nitrogen needs to be manually stored in the balloon, and then the balloon needs to be put into the pit. The workload is large and the number of detections is limited. It is not suitable for multiple detections. 3. There is no data record during the detection process. Each time a manual detection operation is performed, it can only detect whether the oxygen concentration sensor is normal. The accurate time and detection status data are not recorded, and the process cannot be traced. Summary of the invention

[0003] To achieve the above-mentioned purpose, the specific technical scheme of the present invention is: an automatic inspection device for oxygen concentration in a pit, comprising a distribution box arranged on the pit, a central control mechanism is installed on the distribution box, a gas conveying mechanism, a detection mechanism and an exhaust mechanism used in conjunction with the distribution box are provided on the pit, the detection mechanism is installed in the pit, the exhaust mechanism is installed at the pit mouth, the gas conveying mechanism extends from the pit mouth to the pit and is installed in conjunction with the detection mechanism, the gas conveying mechanism can be controlled by the central control mechanism to convey argon gas to the vicinity of the detection mechanism, and an argon atmosphere is formed near the detection mechanism to determine whether there is an abnormality in the detection mechanism. After the determination is completed, the exhaust is ventilated through the exhaust mechanism to complete the automatic inspection.

[0004] Preferably, the central control mechanism can control the gas delivery mechanism to automatically and regularly inspect the detection mechanism, and can accurately control the amount of argon gas delivered by the argon delivery pipe to the detection mechanism, so as to achieve accurate judgment of the detection mechanism.

[0005] Preferably, a safety fence is provided on the pit, and an alarm light is installed on the safety fence, and the alarm light is used to give an alarm through the control of the central controller when an abnormality is detected.

[0006] Preferably, the gas delivery mechanism includes an argon delivery pipe, an argon tank is provided on the pit, the argon tank is provided with a connecting pipe, an argon access valve for emergency disconnection of the argon and an argon pressure reducing valve for controlling the argon pressure are installed on the connecting pipe, an argon delivery pipe is connected to the connecting pipe, a winding mechanism is provided on the argon delivery pipe, the winding mechanism can retract and release the argon delivery pipe, a three-way joint pipe is connected to the argon delivery pipe, two solenoid valves for controlling the on and off of the pipeline argon are installed on the three-way joint pipe, and a mounting head is provided on the solenoid valve.

[0007] Preferably, the detection mechanism includes an oxygen concentration sensor, which is arranged and installed in a pit. A fixed seat plate is provided on the oxygen concentration sensor, and a mounting hole matching the mounting head is opened on the fixed seat plate. By inserting the mounting head into the mounting hole and tightening the nut, the argon gas delivery pipe can be fixed near the oxygen concentration sensor, so as to form an argon gas atmosphere near the oxygen concentration sensor. A clamp seat is provided on the oxygen concentration sensor, and bolts are threadedly provided on the clamp seat. A fastening plate is installed on the bolts, and the fastening plate can be driven to slide up and down on the clamp seat by twisting the bolts, so as to facilitate the installation of the oxygen concentration sensor.

[0008] Preferably, the winding mechanism includes a driving motor, a mounting seat is provided on the pit, the driving motor is installed on the mounting seat, a roller for winding the argon gas delivery tube is connected to the driving motor, a support seat is rotatably provided on the roller, the support seat is connected to the trolley, a reciprocating screw is rotatably provided on the support seat, both the reciprocating screw and the roller are equipped with pulleys, the two pulleys are connected by transmission, a slider is threadedly provided on the reciprocating screw, a slide rod is slidably provided on the slider, the slide rod is connected to the support seat, a limiting ring for limiting the argon gas delivery tube is provided on the slider, the argon gas delivery tube passes through the limiting ring, the roller can be rotated by driving the driving motor, and the reciprocating screw is driven to rotate synchronously through the transmission of the pulley and the belt, so that the slider slides along the slide rod with the limiting ring, and the argon gas delivery tube can be neatly unwound.

[0009] Preferably, the exhaust mechanism includes a mounting plate, which can be installed at the entrance of the pit, on which is mounted an exhaust fan for drawing gas, and the exhaust fan is connected to a drainage pipe for guiding the gas. By controlling the start-up of the exhaust fan, the gas in the pit can be extracted and discharged through the guidance of the drainage pipe.

[0010] Preferably, the central control mechanism includes a central controller, which is installed on a distribution box. The central controller can control various electrical components. The distribution box is equipped with a memory for recording and storing data and a wireless signal transceiver for sending and receiving various data. The distribution box is provided with a box door, an automatic timing timer is installed on the box door, and a display screen for displaying various data is installed on the box door.

[0011] Preferably, an oxygen tube through which oxygen can circulate is provided in the pit, an oxygen mask is provided on the oxygen tube, and the oxygen mask is provided with an oxygen valve. When an abnormal malfunction occurs during inspection, if there are people working in the pit who cannot evacuate in time, they can put on the oxygen mask, open the oxygen valve and breathe oxygen, and wait for rescue to avoid fainting in the pit.

[0012] A method for inspecting an automatic inspection device for pit oxygen concentration, wherein the specific inspection steps are as follows: Step 1: Click the inspection button on the display screen to start the inspection. The central controller will control one of the solenoid valves to start and work with the timer to make the three-way joint pipe release argon for about 5 seconds and then close. After the argon is discharged from the three-way joint pipe, an argon atmosphere is formed near the oxygen concentration sensor. Step 2: The oxygen concentration sensor cooperates with the timer to detect the surrounding oxygen concentration for 10 seconds to determine whether the oxygen concentration is too low; If the oxygen concentration does not decrease, the central controller will broadcast an alarm throughout the plant and keep the alarm light on to remind maintenance personnel to intervene manually. The solenoid valve may not be opened or the oxygen concentration sensor may be faulty. If the oxygen concentration is too low, the central controller will start the exhaust fan and the timer will be used to exhaust for 60 seconds. Step 3: After exhaust is completed, check the surrounding oxygen concentration again to determine whether the oxygen concentration is too low; If the oxygen concentration does not decrease, the display screen will show that the oxygen concentration inspection is normal and record the monitoring time. If the oxygen concentration is too low, the central controller will control the plant-wide broadcast alarm and control the alarm light to stay on to alert maintenance personnel to intervene manually. The solenoid valve may not be closed or the oxygen concentration sensor may be faulty.

[0013] In view of the above technical features, when applied in actual pit inspection: It is worth mentioning that: Figure 5 As shown, when the oxygen concentration sensor is installed under the pit, bolts are usually required for fixing. This fixing method will cause the oxygen concentration sensor to be damaged and it is not convenient to disassemble and replace the oxygen concentration sensor in time. By setting the clamp seat, it is convenient to put objects such as angle iron D or rod into the clamp seat, and then tighten the bolts to drive the fastening plate to press the angle iron or rod, and twist the bolts in the opposite direction to disassemble the oxygen concentration sensor. like Figure 2 As shown, when installed on an actual pit, it will include the ground A, pit B and exhaust port C. The alarm light can be installed on the safety fence at the entrance of pit B. The exhaust fan can be installed in connection with the exhaust port C through the installation fixing plate, so as to facilitate the extraction of gas from pit B through the exhaust port C.

[0014] Compared with the prior art, the beneficial effects of the present invention are: under the control of the central control mechanism, the argon gas delivery pipe and the oxygen concentration sensor are arranged to realize automatic spot inspection of the oxygen concentration in the pit, the oxygen concentration sensor can monitor the oxygen concentration in the pit in real time, and by starting the solenoid valve, the three-way joint pipe can be controlled to open, so that argon gas enters the pit through the argon gas delivery pipe, and an argon gas atmosphere is formed near the oxygen concentration sensor, so as to judge whether the working state of the oxygen concentration sensor is abnormal, without manual detection, reducing the operation risk, and the automated detection has higher detection efficiency than manual detection, and at the same time, the detection data can be recorded in real time during each detection operation, which is convenient for traceability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a reference schematic diagram of the overall structural state of an embodiment of the present invention.

[0017] Figure 2 This is a rendering of the device according to an embodiment of the present invention installed on a pit.

[0018] Figure 3 Schematic diagram for reference of the structural state of the winding mechanism according to an embodiment of the present invention.

[0019] Figure 4 Schematic diagram for reference of the structural state of the detection mechanism according to an embodiment of the present invention.

[0020] Figure 5 This is a reference schematic diagram of the structural status of the detection mechanism and angle iron installation according to an embodiment of the present invention.

[0021] Figure 6 1 is a step diagram of the inspection method according to an embodiment of the present invention.

[0022] Explanation of the markings in the figure: 1. Argon gas tank; 2. Distribution box; 3. Box door; 4. Connecting pipe; 5. Argon gas delivery pipe; 6. Winding mechanism; 61. Driving motor; 62. Support seat; 63. Roller; 64. Reciprocating screw; 65. Sliding rod; 66. Pulley; 67. Sliding block; 68. Limiting ring; 7. Detection mechanism; 71. Oxygen concentration sensor; 72. Fixed seat plate; 73. Clamp seat; 74. Bolt; 75. Fastening plate; 8. Exhaust mechanism; 8 1. Installation fixing plate; 82. Exhaust fan; 83. Drainage pipe; 9. Alarm light; 10. Mounting base; 11. Argon inlet valve; 12. Argon pressure reducing valve; 13. Three-way joint pipe; 14. Solenoid valve; 15. Mounting head; 16. Mounting hole; 17. Timer; 18. Display screen; 19. Wireless signal transceiver; 20. Central controller; 21. Memory; 22. Oxygen mask; 23. Oxygen tube; 24. Oxygen valve; 25. Safety fence. DETAILED DESCRIPTION

[0023] The embodiments of the present disclosure are described in detail below in conjunction with the accompanying drawings. The implementation methods of the present disclosure are explained below through specific examples. Those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification, which are further explained below in conjunction with the accompanying drawings.

[0024] See also Figure 1-6It can be seen that an embodiment of the present invention is an automatic inspection device for oxygen concentration in a pit, comprising a distribution box 2 arranged on the pit, a detection mechanism 7 and an exhaust mechanism 8 matched with the distribution box 2, a box door 3 is installed on the distribution box 2, a central control mechanism is placed on the distribution box 2, a winding mechanism 6 is arranged on the pit, an argon gas delivery pipe 5 is arranged on the winding mechanism 6, the retraction and release of the argon gas delivery pipe 5 can be controlled by the winding mechanism 6, the argon gas delivery pipe 5 is detachably connected with the detection mechanism 7, an exhaust mechanism 8 is arranged on the pit, the exhaust mechanism 8 can be installed at the entrance of the pit to exhaust the inside of the pit, the detection mechanism 7 can be installed on the equipment in the pit, the argon gas delivery pipe 5 can be extended into the pit and used in conjunction with the detection mechanism 7, the oxygen concentration in the pit can be monitored in real time by the detection mechanism 7, and the central control mechanism can form an argon atmosphere near the detection mechanism 7 in conjunction with the use of the argon gas delivery pipe 5, the detection mechanism 7 is inspected, and it is judged whether there is an abnormality in the detection mechanism 7. After the judgment is completed, the exhaust is ventilated through the exhaust mechanism 8.

[0025] Furthermore, a mounting seat 10 is provided on the pit, on which a connecting pipe 4 connected to an argon gas delivery pipe 5 is installed, the connecting pipe 4 is connected to an argon tank 1 for providing argon gas required for detection through a pipeline, the connecting pipe 4 is provided with an argon gas access valve 11 for emergency disconnection of argon gas and an argon gas pressure reducing valve 12 for controlling the argon gas pressure, the argon gas delivery pipe 5 is connected with a three-way joint pipe 13, on which two solenoid valves 14 for controlling the on and off of the pipeline argon gas are installed, and a mounting head 15 is provided on the solenoid valve 14.

[0026] It is worth mentioning that: installing dual solenoid valves 14 can prevent one of the solenoid valves 14 from getting stuck, resulting in no air or frequent exhaust, and the other solenoid valve 14 can be started to continue the normal inspection work.

[0027] Furthermore, the detection mechanism 7 includes an oxygen concentration sensor 71, which is arranged in a pit. A fixed seat plate 72 is arranged on the oxygen concentration sensor 71, and a mounting hole 16 matching the mounting head 15 is opened on the fixed seat plate 72. By inserting the mounting head 15 into the mounting hole 16 and tightening the nut, the argon gas delivery pipe 5 can be fixed near the oxygen concentration sensor 71, so as to form an argon gas atmosphere near the oxygen concentration sensor 71. A clamp seat 73 is arranged on the oxygen concentration sensor 71, and a bolt 74 is threadedly arranged on the clamp seat 73. A fastening plate 75 is mounted on the bolt 74. By twisting the bolt 74, the fastening plate 75 can be driven to slide up and down on the clamp seat 73, so as to facilitate the installation of the oxygen concentration sensor 71.

[0028] Furthermore, the winding mechanism 6 includes a driving motor 61, which is mounted on the mounting seat 10. A roller 63 for winding the argon delivery tube 5 is mounted on the driving motor 61. A support seat 62 is rotatably provided on the roller 63. The support seat 62 is connected to the mounting seat 10. A reciprocating screw 64 is rotatably provided on the support seat 62. A pulley 66 is mounted on the reciprocating screw 64 and the roller 63. The two pulleys 66 are connected to each other by transmission. A slider 6 is threadedly provided on the reciprocating screw 64. 7. A slide bar 65 is slidably provided on the slider 67, and the slide bar 65 is connected to the support seat 62. A limiting ring 68 is provided on the slider 67 for limiting the argon gas delivery tube 5. The argon gas delivery tube 5 passes through the limiting ring 68. By driving the driving motor 61, the winding roller 63 can be rotated, and the reciprocating screw 64 is driven to rotate synchronously through the transmission of the pulley 66 and the belt, so that the slider 67 slides along the slide bar 65 with the limiting ring 68, and the argon gas delivery tube 5 can be neatly unwound.

[0029] Furthermore, the exhaust mechanism 8 includes an installation fixing plate 81, which can be installed at the entrance of the pit. An exhaust fan 82 for extracting gas is installed on the installation fixing plate 81, and a drainage pipe 83 for guiding the gas is connected to the exhaust fan 82. By controlling the exhaust fan 82 to start, the gas in the pit can be extracted and discharged through the guidance of the drainage pipe 83.

[0030] It is worth mentioning that the length and direction of the drainage pipe 83 can be adjusted and arranged according to the planning of the pit or workshop.

[0031] Furthermore, the central control mechanism includes a central controller 20, which is installed on the distribution box 2. The central controller 20 can control various electrical components. The distribution box 2 is equipped with a memory 21 for storing and recording data during the inspection process and a wireless signal transceiver 19 for sending and receiving various data. The memory 21 can be installed on the box door 3. An automatic timing timer 17 and a display screen 18 for displaying various data are installed.

[0032] It is worth mentioning that the central controller 20 can be connected to the factory broadcast via the wireless signal transceiver 19, and when the inspection is started or when a fault occurs, it can promptly remind employees and equipment personnel to intervene.

[0033] Furthermore, a safety fence 25 is provided on the pit, and an alarm light 9 is installed on the safety fence 25. The alarm light 9 is used to give an alarm through the control of the central controller 20 when an abnormality is detected.

[0034] It is worth mentioning that during the inspection, the warning light 9 will flash periodically, and when a fault occurs, the warning light 9 will be always on to give an alarm.

[0035] Furthermore, an oxygen pipe 23 through which oxygen can circulate is provided in the pit, an oxygen mask 22 is provided on the oxygen pipe 23, and the oxygen mask 22 is provided with an oxygen valve 24. When a malfunction occurs during inspection, if there are personnel working in the pit who cannot evacuate in time, they can put on the oxygen mask 22, open the oxygen valve 24 and breathe oxygen, and wait for rescue, so as to avoid fainting in the pit.

[0036] In view of the above technical features, when applied in actual pit inspection: It is worth mentioning that: Figure 5 As shown, when the oxygen concentration sensor 71 is installed under the pit, bolts are usually required for fixing. This fixing method will cause the oxygen concentration sensor 71 to be damaged, and it is not convenient to disassemble and replace the oxygen concentration sensor 71 in time. By setting the clamp seat 73, it is convenient to put objects such as angle iron D or rod body into the clamp seat 73, and then tighten the bolt 74 to drive the fastening plate 75 to press the angle iron or rod body, and reversely twist the bolt 74 to disassemble the oxygen concentration sensor 71; like Figure 2 As shown, when installed on an actual pit, it will include the ground A, the pit B and the exhaust port C. The alarm light 9 can be installed on the safety fence 25 at the entrance of the pit B. The exhaust fan 82 can be installed in communication with the exhaust port C through the mounting fixing plate 81, so as to facilitate the extraction of gas from the pit B through the exhaust port C.

[0037] A method for inspecting an automatic inspection device for pit oxygen concentration, wherein the specific inspection steps are as follows: Step 1: Click the inspection button on the display screen 18 to start the inspection. The central controller 20 will control one of the solenoid valves 14 to start and cooperate with the timer 17 to make the three-way joint pipe 13 release argon gas for about 5 seconds and then close. After the argon gas is discharged from the three-way joint pipe 13, an argon gas atmosphere is formed near the oxygen concentration sensor 71. Step 2: The oxygen concentration sensor 71 cooperates with the timer 17 to detect the surrounding oxygen concentration for 10 seconds to determine whether the oxygen concentration is too low; If the oxygen concentration does not decrease, the central controller 20 controls the whole plant broadcast alarm, and controls the alarm light 9 to be always on to alert the maintenance personnel to intervene manually. The solenoid valve 14 may not be opened or the oxygen concentration sensor 71 may be faulty. If the oxygen concentration is too low, the central controller 20 starts the exhaust fan 82 in conjunction with the timer 17 to exhaust for 60 seconds; Step 3: After exhaust is completed, check the surrounding oxygen concentration again to determine whether the oxygen concentration is too low; If the oxygen concentration does not decrease, the display screen 18 shows that the oxygen concentration inspection is normal and records the monitoring time. If the oxygen concentration is too low, the central controller 20 controls the whole plant broadcast alarm and controls the alarm light 9 to be always on to alert the maintenance personnel to intervene manually. The solenoid valve 14 may not be closed or the oxygen concentration sensor 71 may be faulty.

[0038] In summary, the above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. An automatic spot check device for oxygen concentration in a pit, comprising a distribution box (2) arranged on the pit, characterized in that: The distribution box (2) is provided with a central control mechanism, and the pit is provided with a gas delivery mechanism, a detection mechanism (7) and an exhaust mechanism (8) for use with the distribution box (2). The detection mechanism (7) is installed in the pit, and the exhaust mechanism (8) is installed at the pit opening. The gas delivery mechanism extends from the pit opening to the pit and is installed in conjunction with the detection mechanism (7). The central control mechanism can control the gas delivery mechanism to deliver argon gas to the vicinity of the detection mechanism (7), so as to form an argon gas atmosphere near the detection mechanism (7) to determine whether the detection mechanism (7) has an abnormality. After the determination is completed, the exhaust is ventilated through the exhaust mechanism (8) to complete the automatic spot inspection.

2. The automatic spot detection device for pit oxygen concentration according to claim 1 is characterized by: The central control mechanism can control the gas delivery mechanism to automatically and regularly inspect the detection mechanism (7), and can accurately control the amount of argon gas delivered by the argon delivery pipe (5) to the detection mechanism (7), so as to achieve accurate judgment of the detection mechanism (7).

3. The automatic spot detection device for pit oxygen concentration according to claim 1 is characterized by: A safety fence (25) is provided on the pit, and an alarm light (9) is installed on the safety fence (25). The alarm light (9) is used to generate an alarm through the control of the central controller (20) when an abnormality is detected.

4. The automatic spot detection device for pit oxygen concentration according to claim 2 is characterized by: The gas delivery mechanism comprises an argon delivery pipe (5), an argon tank (1) is arranged on the pit, the argon tank (1) is arranged on a connecting pipe (4), an argon access valve (11) capable of emergency disconnection of argon and an argon pressure reducing valve (12) capable of controlling the pressure of argon are installed on the connecting pipe (4), an argon delivery pipe (5) is connected to the connecting pipe (4), a winding mechanism (6) is arranged on the argon delivery pipe (5), the winding mechanism (6) can retract and release the argon delivery pipe (5), a three-way joint pipe (13) is connected to the argon delivery pipe (5), two solenoid valves (14) capable of controlling the on and off of argon in the pipeline are installed on the three-way joint pipe (13), and a mounting head (15) is arranged on the solenoid valve (14).

5. The automatic spot detection device for pit oxygen concentration according to claim 4 is characterized by: The detection mechanism (7) comprises an oxygen concentration sensor (71), the oxygen concentration sensor (71) being arranged and installed in a pit, the oxygen concentration sensor (71) being provided with a fixing seat plate (72), the fixing seat plate (72) being provided with a mounting hole (16) matching with the mounting head (15), the mounting head (15) being inserted into the mounting hole (16) and then tightening the nut, so that the argon gas delivery pipe (5) can be fixed near the oxygen concentration sensor (71), so that an argon gas atmosphere can be formed near the oxygen concentration sensor (71), the oxygen concentration sensor (71) being provided with a clamping seat (73), the clamping seat (73) being threaded with a bolt (74), the bolt (74) being mounted with a fastening plate (75), and the fastening plate (75) can be driven to slide up and down on the clamping seat (73) by twisting the bolt (74), so that the oxygen concentration sensor (71) can be installed conveniently.

6. The automatic spot detection device for pit oxygen concentration according to claim 4 is characterized by: The winding mechanism (6) comprises a driving motor (61), a mounting seat (10) is provided on the pit, the driving motor (61) is mounted on the mounting seat (10), a winding roller (63) for winding the argon gas delivery pipe (5) is mounted on the driving motor (61), a support seat (62) is rotatably provided on the winding roller (63), the support seat (62) is connected to the trolley (1), a reciprocating screw (64) is rotatably provided on the support seat (62), a belt pulley (66) is mounted on the reciprocating screw (64) and the winding roller (63), the two belt pulleys (66) are connected in a transmission manner, and a threaded part on the reciprocating screw (64) is provided. A slider (67) is provided, a slide bar (65) is slidably provided on the slider (67), the slide bar (65) is connected to the support seat (62), a limiting ring (68) is provided on the slider (67) for limiting the position of the argon gas delivery tube (5), the argon gas delivery tube (5) passes through the limiting ring (68), and the winding roller (63) can be rotated by driving the driving motor (61), and the reciprocating screw (64) is driven to rotate synchronously through the transmission of the pulley (66) and the belt, so that the slider (67) slides along the slide bar (65) with the limiting ring (68), so that the argon gas delivery tube (5) can be neatly unwound.

7. The automatic spot detection device for pit oxygen concentration according to claim 1 is characterized by: The exhaust mechanism (8) comprises a mounting plate (81), which can be mounted at the entrance of the pit; an exhaust fan (82) for extracting gas is mounted on the mounting plate (81); a drainage pipe (83) for guiding gas is connected to the exhaust fan (82); and gas in the pit can be extracted by controlling the exhaust fan (82) to start and be discharged through the guidance of the drainage pipe (83).

8. The automatic spot inspection device for pit oxygen concentration according to claim 4 is characterized by: The central control mechanism comprises a central controller (20), the central controller (20) being mounted on a distribution box (2), the central controller (20) being capable of controlling various electrical components, the distribution box (2) being equipped with a memory (21) for recording and storing data and a wireless signal transceiver (19) for transmitting and receiving various data, the distribution box (2) being provided with a box door (3), the box door (3) being equipped with an automatic timing timer (17), and the box door (3) being equipped with a display screen (18) for displaying various data.

9. The automatic spot detection device for pit oxygen concentration according to claim 1 is characterized by: An oxygen pipe (23) through which oxygen can flow is arranged in the pit, an oxygen mask (22) is arranged on the oxygen pipe (23), and the oxygen mask (22) is provided with an oxygen valve (24). When a fault occurs during inspection, if there are personnel working in the pit who cannot be evacuated in time, they can put on the oxygen mask (22) and open the oxygen valve (24) to inhale oxygen and wait for rescue, thereby avoiding fainting in the pit.

10. A method for inspecting an automatic inspection device for oxygen concentration in a pit according to any one of claims 1 to 9, characterized in that: The specific inspection steps are as follows: Step 1: By clicking the inspection button on the display screen (18) to start the inspection, the central controller (20) will control one of the solenoid valves (14) to start and cooperate with the timer (17) to time, so that the three-way joint pipe (13) releases argon gas for about 5 seconds and then closes. After the argon gas is discharged from the three-way joint pipe (13), an argon gas atmosphere is formed near the oxygen concentration sensor (71); Step 2: The oxygen concentration sensor (71) cooperates with the timer (17) to detect the surrounding oxygen concentration for 10 seconds to determine whether the oxygen concentration is too low; If the oxygen concentration does not decrease, the central controller (20) controls the whole plant broadcast alarm and controls the alarm light (9) to be always on to alert the maintenance personnel to intervene manually. It may be that the solenoid valve (14) is not opened or the oxygen concentration sensor (71) is faulty. If the oxygen concentration is too low, the central controller (20) starts the exhaust fan (82) in conjunction with the timer (17) to exhaust for 60 seconds; Step 3: After exhaust is completed, check the surrounding oxygen concentration again to determine whether the oxygen concentration is too low; If the oxygen concentration does not decrease, the display screen (18) shows that the oxygen concentration is normal and records the monitoring time. If the oxygen concentration is too low, the central controller (20) controls the whole plant to broadcast an alarm and controls the alarm light (9) to be always on to alert the maintenance personnel to intervene manually. It may be that the solenoid valve (14) is not closed or the oxygen concentration sensor (71) is faulty.

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