A confined space gas detection safety interlock method

Abstract

The present invention discloses a gas detection safety interlocking method for a confined space, comprising the following steps: S1: operation input, a worker operates a key switch A before entering the confined space for maintenance; S2: the confined space performs the first gas release under the control of a processor; S3: the gas concentration sensor performs toxic gas concentration detection in the confined space under the control of the processor; S4: the processor analyzes whether the toxic gas concentration is qualified, and the mechanical key A1 can be rotated and removed only after the gas concentration is qualified; S5: under the control of the processor, the confined space performs the second forced gas release after the gas concentration is qualified. The present invention adopts a mechanical safety interlocking control method to ensure that there is no possibility of misoperation, eliminates the phenomenon of human judgment errors, and has the advantages of mandatory and logicality compared with the existing independent module detection and switch, which rely on human subjective judgment to operate, so that people's life safety is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of gas detection, and in particular to a safety interlocking method for gas detection in a confined space. Background Art

[0002] Industry, municipal administration, construction and other sectors are inseparable from confined space operations. In recent years, poisoning and suffocation accidents in confined space operations have emerged in an endless stream. This is due to the lack of strict management systems in construction units, lack of strict organization in implementation, and lack of necessary safety precautions at the work site. At the same time, some construction personnel lack the necessary safety knowledge and are not aware of the dangers of entering confined spaces. In the absence of ventilation facilities or defective ventilation facilities, resulting in poor ventilation in the workplace and accumulation of toxic and harmful gases, they work in violation of regulations and suffer from poisoning or suffocation. This situation seriously endangers the life and health of the staff.

[0003] In order to avoid various accidents, it is necessary to ensure that the confined space environment reaches a safe state before entering the construction. However, there are still defects in this regard in the existing technology. Therefore, it is necessary to propose a confined space gas detection safety interlock method. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the original robot energy debugging process in the prior art relies solely on human subjective judgment to switch on and off, there is a possibility of misoperation, and absolute safety conditions cannot be achieved. A confined space gas detection safety interlock method is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A confined space gas detection safety interlock method comprises the following steps:

[0007] S1: Operation input, the worker operates key switch A before entering the sealed space for maintenance;

[0008] S2: The sealed space is released for the first time under the control of the processor;

[0009] S3: Under the control of the processor, the gas concentration sensor detects the concentration of toxic gases in the sealed space;

[0010] S4: The processor analyzes whether the concentration of toxic gas is qualified. The mechanical key A1 can be turned and removed only after the gas concentration is qualified.

[0011] S5: Under the control of the processor, after the gas concentration is tested to be qualified, the sealed space is forcibly released for the second time;

[0012] S6: The worker carries the mechanical key A1 to the mechanical door lock B in the confined space and inserts and turns the mechanical key A1 before turning the mechanical key B1 to open the door lock;

[0013] S7: The worker removes the mechanical key B1 and carries it into the confined space for maintenance.

[0014] As a further solution of the present invention: S1 includes a control panel, the control panel includes a key switch A, and the key switch A is electrically connected to the processor in S2, and the model of the processor is ARM9TDMI.

[0015] As a further solution of the present invention: S2 includes a first air pump, which is electrically connected to the processor, a first air inlet pipe is sealed between the air inlet of the first air pump and the sealed space, a first air outlet pipe is connected between the air outlet of the first air pump and the atmosphere, and a ventilation pipe with an electromagnetic valve is also provided in the sealed space. When a worker operates key switch A, the circuit is connected, the electromagnetic valve in the ventilation pipe opens, the sealed space is connected to the outside world, the first air pump evacuates air, and introduces the gas into the outside world for treating toxic gases.

[0016] As a further solution of the present invention: S3 includes a gas concentration sensor and a display, the gas concentration sensor and the display are electrically connected, the gas concentration sensor and the display are electrically connected to the processor in S2 through a data line, and after the first air pump works for 10-25 minutes, the gas concentration sensor detects the gas concentration in the sealed space, and the detected value is displayed on the display.

[0017] As a further solution of the present invention: the processor in S4 analyzes the value fed back by the gas concentration sensor and compares it with the information in the database. If it is not within the safe range, the first air pump continues to work. If it is within the safe range, the first air pump stops working and the electromagnetic valve is closed. At this time, the worker turns and removes the mechanical key A1.

[0018] As a further solution of the present invention: S5 includes a second air pump, which is electrically connected to the processor, a second air inlet pipe is sealed between the air inlet of the second air pump and the sealed space, and a second air outlet pipe is connected between the air outlet of the second air pump and the atmosphere. When the value detected by the gas concentration sensor is within a safe range, the solenoid valve is opened again, and the second air pump starts working, and the gas in the sealed space is forced to be replaced again, so that the concentration of toxic gas is further reduced.

[0019] As a further solution of the present invention: S6 includes a mechanical door lock B for installation on the door of a sealed space, and the mechanical door lock B is provided with a keyhole for a mechanical key A1 and a mechanical lock with a mechanical key B1. After the second air pump has been working for 10-25 minutes, the worker carries the mechanical key A1 to the mechanical door lock B in the enclosed space, inserts and turns the mechanical key A1, and then turns the mechanical key B1 to open the door lock.

[0020] As a further solution of the present invention: when the second air pump is continuously working, the worker takes out the key B1 to open the sealed space and carries the key B1 into the sealed space for maintenance.

[0021] The beneficial effects of the present invention are:

[0022] 1. Through the setting of various instruments in the instrument box, the mechanical safety interlock control method is adopted to ensure that there is no possibility of misoperation, which eliminates the phenomenon of human judgment errors. Compared with the existing independent module detection and switch, which rely on human subjective judgment for operation, it has the advantages of mandatory and logical, so that people's life safety is guaranteed.

[0023] 2. By setting up the first air pump and the second air pump, the two air pumps work in sequence so that the device can exchange gases on both sides, thereby reducing the content of toxic gases in the sealed space again and again, ensuring the life safety of maintenance personnel after entering and improving the practicality of the device.

[0024] 3. By connecting the gas concentration sensor to the display screen, the concentration of toxic gases in the sealed space can be easily known to the workers, making it easier for them to proceed to the next step.

[0025] 4. By setting up the ventilation pipe, the device can always be connected to the atmosphere when the device is working, so that the sealed space is always in a ventilated state.

[0026] 5. Through the combination of gas concentration sensors, electromagnetic valves and safety interlocks, the inherent safety of confined space inspection personnel can be achieved. Only those with qualified gas concentrations can enter the confined space, and after entering, the air in the confined space is forced to circulate to ensure personnel safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a system module flow chart of a confined space gas detection safety interlock method proposed by the present invention. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] Example 1

[0030] Reference Figure 1 , a confined space gas detection safety interlock method, comprising:

[0031] S1: Operation input, the worker operates key switch A before entering the sealed space for maintenance;

[0032] S2: The sealed space is released for the first time under the control of the processor;

[0033] S3: Under the control of the processor, the gas concentration sensor detects the concentration of toxic gases in the sealed space;

[0034] S4: The processor analyzes whether the concentration of toxic gas is qualified. The mechanical key A1 can be turned and removed only after the gas concentration is qualified.

[0035] S5: Under the control of the processor, after the gas concentration is tested to be qualified, the sealed space is forcibly released for the second time;

[0036] S6: The worker carries the mechanical key A1 to the mechanical door lock B in the confined space and inserts and turns the mechanical key A1 before turning the mechanical key B1 to open the door lock;

[0037] S7: The worker removes the mechanical key B1 and carries it into the confined space for maintenance.

[0038] As a further solution of the present invention: S1 includes a control panel, the control panel includes a key switch A, and the key switch A is electrically connected to the processor in S2, and the model of the processor is ARM9TDMI.

[0039] As a further solution of the present invention: S2 includes a first air pump, which is electrically connected to the processor, a first air inlet pipe is sealed between the air inlet of the first air pump and the sealed space, a first air outlet pipe is connected between the air outlet of the first air pump and the atmosphere, and a ventilation pipe with an electromagnetic valve is also provided in the sealed space. When a worker operates key switch A, the circuit is connected, the electromagnetic valve in the ventilation pipe opens, the sealed space is connected with the outside world, the first air pump evacuates air, and introduces the gas into the outside world for treating toxic gases.

[0040] As a further solution of the present invention: S3 includes a gas concentration sensor and a display, the gas concentration sensor and the display are electrically connected, the gas concentration sensor and the display are electrically connected to the processor in S2 through a data line, and after the first air pump works for 10-15 minutes, the gas concentration sensor detects the gas concentration in the sealed space, and the detected value is displayed on the display.

[0041] As a further solution of the present invention: the processor in S4 analyzes the value fed back by the gas concentration sensor and compares it with the information in the database. If it is not within the safe range, the first air pump continues to work. If it is within the safe range, the first air pump stops working and the electromagnetic valve is closed. At this time, the worker turns and removes the mechanical key A1.

[0042] As a further solution of the present invention: S5 includes a second air pump, which is electrically connected to the processor, a second air inlet pipe is sealed between the air inlet of the second air pump and the sealed space, and a second air outlet pipe is connected between the air outlet of the second air pump and the atmosphere. When the value detected by the gas concentration sensor is within a safe range, the solenoid valve is opened again, and the second air pump starts working, and the gas in the sealed space is forced to be replaced again, so that the concentration of toxic gas is further reduced.

[0043] As a further solution of the present invention: S6 includes a mechanical door lock B for installation on the door of a sealed space, and the mechanical door lock B is provided with a keyhole for a mechanical key A1 and a mechanical lock with a mechanical key B1. After the second air pump has been working for 10-15 minutes, the worker carries the mechanical key A1 to the mechanical door lock B in the enclosed space, inserts and turns the mechanical key A1, and then turns the mechanical key B1 to open the door lock.

[0044] As a further solution of the present invention: when the second air pump is continuously working, the worker takes out the key B1 to open the sealed space and carries the key B1 into the sealed space for maintenance.

[0045] The working principle of this embodiment is as follows: during use, when the maintenance worker needs to enter the enclosed space filled with toxic gas for maintenance and inspection, he operates the key switch lock A. At this time, the operation signal is transmitted to the processor. After analysis and processing by the processor, the electromagnetic valve in the ventilation pipe is opened, and the first air pump works to extract the toxic gas in the sealed space and introduce it into the outside world through the first outlet pipe for treating toxic gas. The working time of the first air pump is within 10-15 minutes. At this time, the gas concentration sensor installed in the sealed space continuously monitors the change of gas concentration in the sealed space, and transmits the gas concentration change signal to the processor at all times for analysis and processing by the processor. The specific numerical value of the gas concentration is displayed on the display. If the gas concentration is If it fails, the first air pump will continue to work. When the gas concentration drops to a safe range, the worker can turn and remove the mechanical key A1. At this time, the processor controls the solenoid valve to open again, and the second air pump starts to work, and the gas in the sealed space is forced to be replaced again to lower the concentration of toxic gas. After the second air pump has been working for 10-15 minutes, the worker carries the mechanical key A1 to the mechanical door lock B of the enclosed space, inserts and turns the mechanical key A1, and then turns the mechanical key B1 to open the door lock. The maintenance worker turns and removes the mechanical key B1 and carries the mechanical key B1 to enter the enclosed space for maintenance. After entering the enclosed space, the second air pump continues to work to ensure forced circulation of indoor air and ensure the safety of personnel.

[0046] Example 2

[0047] Reference Figure 1 , a confined space gas detection safety interlock method, the main difference between this embodiment and embodiment 1 is that the working time of the first air pump and the second air pump is changed;

[0048] As a further solution of the present invention: S3 includes a gas concentration sensor and a display, the gas concentration sensor and the display are electrically connected, the gas concentration sensor and the display are electrically connected to the processor in S2 through a data line, and after the first air pump works for 15-20 minutes, the gas concentration sensor detects the gas concentration in the sealed space, and the detected value is displayed on the display.

[0049] As a further solution of the present invention: the processor in S4 analyzes the value fed back by the gas concentration sensor and compares it with the information in the database. If it is not within the safe range, the first air pump continues to work. If it is within the safe range, the first air pump stops working and the electromagnetic valve is closed. At this time, the worker turns and removes the mechanical key A1.

[0050] As a further solution of the present invention: S5 includes a second air pump, which is electrically connected to the processor, a second air inlet pipe is sealed between the air inlet of the second air pump and the sealed space, and a second air outlet pipe is connected between the air outlet of the second air pump and the atmosphere. When the value detected by the gas concentration sensor is within a safe range, the solenoid valve is opened again, and the second air pump starts working, and the gas in the sealed space is forced to be replaced again, so that the concentration of toxic gas is further reduced.

[0051] As a further solution of the present invention: S6 includes a mechanical door lock B for installation on the door of a sealed space, and the mechanical door lock B is provided with a keyhole for a mechanical key A1 and a mechanical lock with a mechanical key B1. After the second air pump has been working for 15-20 minutes, the worker carries the mechanical key A1 to the mechanical door lock B in the enclosed space, inserts and turns the mechanical key A1, and then turns the mechanical key B1 to open the door lock.

[0052] As a further solution of the present invention: when the second air pump is continuously working, the worker takes out the key B1 to open the sealed space and carries the key B1 into the sealed space for maintenance.

[0053] Working principle of this embodiment: When in use, when the maintenance worker needs to enter the enclosed space filled with toxic gas for maintenance and inspection, the key switch lock A is operated. At this time, the operation signal is transmitted to the processor. After analysis and processing by the processor, the electromagnetic valve in the ventilation pipe is opened, and the first air pump works to extract the toxic gas in the sealed space and introduce it into the external mechanism for treating toxic gas through the first outlet pipe. The working time of the first air pump is within 15-20 minutes. At this time, the gas concentration sensor installed in the sealed space continuously monitors the change of gas concentration in the sealed space, and transmits the gas concentration change signal to the processor at all times for analysis and processing by the processor. The specific data of the gas concentration It means displayed on the monitor. If the gas concentration is unqualified, the first air pump will continue to work. When the gas concentration drops to a safe range, the worker can turn and remove the mechanical key A1. At this time, the processor controls the solenoid valve to open again, and the second air pump starts to work, and the gas in the sealed space is forced to be replaced again to lower the concentration of toxic gas. After the second air pump works for 15-20 minutes, the maintenance worker operates the electronic switch so that the key B placed in the electronic drawer can be taken out. The maintenance worker takes the key B to enter the enclosed space for maintenance, and after entering the enclosed space, the second air pump continues to work to ensure forced circulation of indoor air and ensure the safety of personnel.

[0054] Example 3

[0055] Reference Figure 1, a confined space gas detection safety interlock method, the main difference between this embodiment and embodiment 1 and embodiment 2 is that the working time of the first air pump and the second air pump is changed;

[0056] As a further solution of the present invention: S3 includes a gas concentration sensor and a display, the gas concentration sensor and the display are electrically connected, the gas concentration sensor and the display are electrically connected to the processor in S2 through a data line, and after the first air pump works for 20-25 minutes, the gas concentration sensor detects the gas concentration in the sealed space, and the detected value is displayed on the display.

[0057] As a further solution of the present invention: the processor in S4 analyzes the value fed back by the gas concentration sensor and compares it with the information in the database. If it is not within the safe range, the first air pump continues to work. If it is within the safe range, the first air pump stops working and the electromagnetic valve is closed. At this time, the worker turns and removes the mechanical key A1.

[0058] As a further solution of the present invention: S5 includes a second air pump, which is electrically connected to the processor, a second air inlet pipe is sealed between the air inlet of the second air pump and the sealed space, and a second air outlet pipe is connected between the air outlet of the second air pump and the atmosphere. When the value detected by the gas concentration sensor is within a safe range, the solenoid valve is opened again, and the second air pump starts working, and the gas in the sealed space is forced to be replaced again, so that the concentration of toxic gas is further reduced.

[0059] As a further solution of the present invention: S6 includes a mechanical door lock B for installation on the door of a sealed space, and the mechanical door lock B is provided with a keyhole for a mechanical key A1 and a mechanical lock with a mechanical key B1. After the second air pump has been working for 20-25 minutes, the worker carries the mechanical key A1 to the mechanical door lock B in the enclosed space, inserts and turns the mechanical key A1, and then turns the mechanical key B1 to open the door lock.

[0060] As a further solution of the present invention: when the second air pump is continuously working, the worker takes out the key B1 to open the sealed space and carries the key B1 into the sealed space for maintenance.

[0061] Working principle of this embodiment: When in use, when the maintenance worker needs to enter the enclosed space filled with toxic gas for maintenance and inspection, the key switch lock A is operated. At this time, the operation signal is transmitted to the processor. After analysis and processing by the processor, the electromagnetic valve in the ventilation pipe is opened, and the first air pump works to extract the toxic gas in the sealed space and introduce it into the external mechanism for treating toxic gas through the first outlet pipe. The working time of the first air pump is within 20-25 minutes. At this time, the gas concentration sensor installed in the sealed space continuously monitors the change of gas concentration in the sealed space, and transmits the gas concentration change signal to the processor at all times for analysis and processing by the processor. The specific data of the gas concentration It means displayed on the monitor. If the gas concentration is unqualified, the first air pump will continue to work. When the gas concentration drops to a safe range, the worker can turn and remove the mechanical key A1. At this time, the processor controls the solenoid valve to open again, and the second air pump starts to work, and the gas in the sealed space is forced to be replaced again to lower the concentration of toxic gas. After the second air pump works for 20-25 minutes, the maintenance worker operates the electronic switch so that the key B placed in the electronic drawer can be taken out. The maintenance worker takes the key B to enter the enclosed space for maintenance, and after entering the enclosed space, the second air pump continues to work to ensure forced circulation of indoor air and ensure the safety of personnel.

[0062] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A confined space gas detection safety interlock method, comprising the following steps: S1: Operation input, the worker operates key switch A before entering the sealed space for maintenance; S2: The sealed space is released for the first time under the control of the processor; S2 includes a first air pump, which is electrically connected to the processor, a first air inlet pipe is sealed between the air inlet of the first air pump and the sealed space, a first air outlet pipe is connected between the air outlet of the first air pump and the atmosphere, and a vent pipe with an electromagnetic valve is also provided in the sealed space. When a worker operates key switch A, the circuit is connected, the electromagnetic valve in the vent pipe is opened, the sealed space is connected to the outside world, the first air pump is used to pump air, and the gas is introduced into the mechanism for treating toxic gases in the outside world; S3: Under the control of the processor, the gas concentration sensor detects the concentration of toxic gases in the sealed space; S4: The processor analyzes whether the concentration of toxic gas is qualified. The mechanical key A1 can be turned and removed only after the gas concentration is qualified. S5: Under the control of the processor, after the gas concentration is tested to be qualified, the sealed space is forcibly released for the second time; The S5 includes a second air pump, which is electrically connected to the processor, a second air inlet pipe is sealed between the air inlet of the second air pump and the sealed space, and a second air outlet pipe is connected between the air outlet of the second air pump and the atmosphere. When the value detected by the gas concentration sensor is within a safe range, the electromagnetic valve is opened again, and the second air pump starts to work, and the gas in the sealed space is forced to be replaced again, so that the concentration of the toxic gas is further reduced; S6: The worker carries the mechanical key A1 to the mechanical door lock B in the confined space and inserts and turns the mechanical key A1 before turning the mechanical key B1 to open the door lock; S7: The worker removes the mechanical key B1 and carries it into the confined space for maintenance.

2. A confined space gas detection safety interlock method according to claim 1, characterized in that: The S1 includes a control panel, which includes a key switch A. The key switch A is electrically connected to the processor in S2, and the model of the processor is ARM9TDMI.

3. A confined space gas detection safety interlock method according to claim 1, characterized in that: S3 includes a gas concentration sensor and a display, which are electrically connected to each other. The gas concentration sensor and the display are electrically connected to the processor in S2 via a data line. After the first air pump works for 10-25 minutes, the gas concentration sensor detects the gas concentration in the sealed space, and the detected value is displayed on the display.

4. A confined space gas detection safety interlock method according to claim 1, characterized in that: The processor in S4 analyzes the value fed back by the gas concentration sensor and compares it with the information in the database. If it is not within the safe range, the first air pump continues to work. If it is within the safe range, the first air pump stops working and the electromagnetic valve is closed. At this time, the worker turns and removes the mechanical key A1.

5. A confined space gas detection safety interlock method according to claim 1, characterized in that: After the second air pump has been working for 10-25 minutes, the worker carries the mechanical key A1 to the mechanical door lock B in the enclosed space, inserts and turns the mechanical key A1, and then turns the mechanical key B1 to open the door lock.

6. A confined space gas detection safety interlock method according to claim 5, characterized in that: While the second air pump is continuously working, the worker removes the key B1 to open the sealed space and enters the sealed space with the key B1 to perform maintenance.

Images