Security control device for limited space

Abstract

The utility model discloses a security control device for a limited space. The device comprises a gas sensor which is arranged in a limited space and is in communication connection with a controller through a first wireless communication module; the electromagnetic lock is mounted on a protective door in a limited space and is in communication connection with the controller; the alarm is mounted outside the limited space and is in communication connection with the controller; the ventilation equipment is mounted at the junction of the interior and the exterior of the limited space and is in communication connection with the controller; the controller is used for controlling the electromagnetic lock to lock / unlock the protective door based on the access authority of the operating personnel and recording the working time of the operating personnel entering the limited space; an alarm is controlled to give an alarm based on the concentration, and ventilation equipment is controlled to start; prompting or alarming based on the working duration; and the remote platform is in communication connection with the controller through a second wireless communication module, so that the environmental parameters in the limited space are monitored in real time, and the safety of operators in the limited space is comprehensively guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of security technology, and more specifically, to a security control device for use in confined spaces. Background Technology

[0002] While various security system solutions exist in the market, these solutions often fail to provide comprehensive and complete adaptability when facing the security needs of confined spaces (such as tunnels, culverts, sewage tanks, and underground utility tunnels). The enclosed or partially enclosed environment and poor natural ventilation of confined spaces present numerous challenges to security operations.

[0003] The existing technology has the following limitations:

[0004] Insufficient environmental monitoring: When working in confined spaces, oxygen levels are prone to be insufficient, and toxic, harmful, flammable and explosive substances can easily accumulate. However, existing security systems are inadequate in monitoring these environmental parameters in real time and cannot provide timely warnings of potential dangers.

[0005] Communication difficulties: The weak signal in confined space environments and the difficulty in network construction limit the data transmission and communication capabilities of existing security systems, making it impossible to achieve real-time and efficient information transmission.

[0006] Delayed emergency response: In emergency situations in confined spaces, existing security systems often lag behind in emergency response and are unable to provide rapid and effective rescue and guidance.

[0007] The existing technology also has the following technical defects:

[0008] Incomplete gas monitoring: Although some security systems have gas monitoring capabilities, they monitor only a limited range of types of gases and cannot cover all harmful gases that may be present in a limited space.

[0009] Limited video surveillance: Due to the confined space and poor lighting conditions, the video surveillance function of existing security systems is often limited and cannot provide clear monitoring images.

[0010] Lack of linkage mechanism: Existing security systems often lack the organic integration of functions such as gas monitoring, video surveillance, and alarm linkage, resulting in the inability to form an effective emergency response mechanism in emergency situations.

[0011] In summary, existing security system solutions on the market have many shortcomings and limitations when facing the security needs of confined spaces. Therefore, developing a security device specifically designed for confined spaces is particularly important. This device needs to be able to monitor environmental parameters within the confined space in real time, possess strong communication and data transmission capabilities, and have a comprehensive emergency response mechanism to fully ensure the safety of personnel working in confined spaces.

[0012] The information disclosed in the background section of this utility model is intended only to enhance the understanding of the general background of this utility model, and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0013] The purpose of this invention is to propose a security control device for confined spaces, which enables real-time monitoring of environmental parameters within the confined space, possesses strong communication and data transmission capabilities, and has a comprehensive emergency response mechanism, thereby fully protecting the safety of personnel working in confined spaces; and solves the problems of insufficient environmental monitoring, communication difficulties, and delayed emergency response in existing security systems when facing the security needs of confined spaces.

[0014] To achieve the above objectives, this utility model proposes a security control device for confined spaces, comprising:

[0015] A gas sensor is installed inside a confined space and is connected to the controller via a first wireless communication module. The gas sensor is used to collect the concentration information of key gases in the confined space and send it to the controller.

[0016] An electromagnetic lock is installed on the protective door of the confined space and is communicatively connected to the controller; the electromagnetic lock is used to unlock / lock the protective door.

[0017] An alarm device is installed outside the confined space and is communicatively connected to the controller; the alarm device is used for audible and visual alarms.

[0018] A ventilation device is installed at the boundary between the interior and exterior of the confined space and is communicatively connected to the controller. The ventilation device is used to supply outside air to the confined space.

[0019] The controller is configured to receive the concentration information of the key gas in the confined space sent by the gas sensor; control the electromagnetic lock to lock / unlock the protective door based on the operator's access rights, and record the working time of the operator in the confined space; control the alarm to sound an alarm based on the concentration information and the corresponding concentration threshold, and simultaneously control the ventilation equipment to start; and provide prompts or alarms based on the working time and the set working time threshold.

[0020] A human-computer interaction device is communicatively connected to the controller. The human-computer interaction device is used to set the permission for staff to enter the confined space, the concentration threshold and the working time threshold, receive instructions from staff, and display the concentration information, working time, prompt information and alarm information.

[0021] The remote platform is connected to the controller via a second wireless communication module. The remote platform is used to receive data uploaded by the controller and send control commands to the controller, and to display the gas concentration curves, personnel entry and exit status and equipment operation status of each of the confined spaces in real time.

[0022] The power supply module is electrically connected to the gas sensor, electromagnetic lock, human-machine interface device and controller respectively.

[0023] Optionally, it also includes:

[0024] The storage module is connected in communication with the controller. The storage module is used to store the concentration information, working time, personnel entry and exit records, alarm records and equipment operation records.

[0025] Optionally, it also includes:

[0026] A control box is installed outside a confined space. The controller is installed inside the control box, and the human-machine interface device is installed on the panel of the control box. The protection level of the control box is IP65.

[0027] Optionally, the gas sensor includes:

[0028] Hydrogen sulfide sensor, ammonia sensor, carbon dioxide sensor, oxygen sensor, volatile organic compound sensor and / or carbon monoxide sensor;

[0029] or,

[0030] All-in-one composite gas sensor.

[0031] Optionally, the power module includes:

[0032] UPS (Uninterruptible Power Supply)

[0033] Optionally, the human-computer interaction device includes:

[0034] Fingerprint recognition module, ID recognition module, iris recognition module and / or face recognition module.

[0035] Optionally, it also includes:

[0036] An emergency unlocking button is installed inside the confined space. The emergency unlocking button is used to forcibly unlock the electromagnetic lock.

[0037] Optionally, it also includes:

[0038] The vibration alarm module is carried by the staff member and communicates with the controller via a second wireless communication module. The vibration alarm module is used to receive alarm information from the controller and trigger a vibration alarm.

[0039] Optionally, the first wireless communication module includes:

[0040] LoRa module, ZigBee module, NB-IoT module, Wi-Fi module or Bluetooth module.

[0041] Optionally, the second wireless communication module includes:

[0042] 4G / 5G network pass-through module, Wi-Fi module and / or Bluetooth module.

[0043] Optionally, it also includes:

[0044] The video surveillance module is installed within the confined space and communicates with the remote platform via the second wireless communication module.

[0045] The beneficial effects of this invention are as follows: This invention collects the concentration information of key gases within a confined space using gas sensors installed inside the space, and sends this information to a controller, which then displays it on a human-machine interface and a remote platform. This enables real-time monitoring of the gas state within the confined space, providing strong protection for safe operations. The human-machine interface manages personnel access permissions, and the controller controls electromagnetic locks to lock / unlock the protective doors of the confined space, recording the working time of personnel within the confined space. This achieves intelligent and precise management of personnel entry and exit, significantly improving safety control and work efficiency. The controller activates alarms based on the concentration information and set concentration thresholds within the confined space, while simultaneously controlling ventilation equipment to exchange air within the space. This provides timely warnings of danger and improves air quality, effectively ensuring personnel safety and a safe working environment. The controller provides prompts or alarms based on working time and set working time thresholds, effectively preventing personnel from working overtime and ensuring personnel safety and orderly work operations. The remote platform displays the gas concentration curves, personnel entry and exit status, and equipment operation status of each confined space in real time, enabling managers to grasp comprehensive information within the confined space in a timely manner and efficiently conduct remote safety supervision and equipment maintenance.

[0046] The device of this invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description

[0047] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, in which the same reference numerals generally represent the same components.

[0048] Figure 1 A schematic diagram of a security control device for a confined space according to an embodiment of the present invention is shown. Detailed Implementation

[0049] The present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0050] Example

[0051] like Figure 1 As shown, this embodiment provides a security control device for confined spaces, including:

[0052] Hydrogen sulfide sensor 2 and ammonia sensor 3 are installed inside the confined space 1 and are connected to the controller 6 via a first wireless communication module 7. The hydrogen sulfide sensor 2 and ammonia sensor 3 are used to collect the concentration information of hydrogen sulfide and ammonia gas within the confined space 1, respectively, and transmit this information to the controller. The hydrogen sulfide sensor 2 detects the concentration of hydrogen sulfide gas within the confined space 1. Once a concentration value is detected, it is immediately converted into an electrical signal and wirelessly transmitted to the controller 6 via the first wireless communication module 7. Similarly, the ammonia sensor 3 monitors the concentration of ammonia gas. Upon capturing ammonia concentration data, it quickly transmits the ammonia concentration data to the controller 6 via the first wireless communication module.

[0053] In this embodiment, the gas sensor can also be a multi-functional composite gas sensor, or other gas sensors can be selected according to the application scenario, such as carbon dioxide sensor, oxygen sensor, volatile organic compound sensor and carbon monoxide sensor; or an infrared or photoionization (PID) sensor can be used to support the simultaneous detection of parameters such as H2S, NH3, CO, and O2.

[0054] In this embodiment, the first wireless communication module 7 may employ one or a combination of LoRa, ZigBee, NB-IoT, Wi-Fi, and Bluetooth.

[0055] The protective door 5 of the confined space 1 is equipped with an electromagnetic lock 4. The electromagnetic lock 4 is equipped with an emergency unlocking function with a mechanical key. The electromagnetic lock 4 is connected to the controller 6. The controller 6 controls the electromagnetic lock 4 to unlock / lock the protective door.

[0056] An audible and visual alarm 11 is installed above the control box 15 outside the confined space 1. The audible and visual alarm 11 is communicatively connected to the controller 6. The controller activates the audible and visual alarm 11 by emitting a high-decibel alarm sound, which can attract the attention of surrounding personnel over a wide area. Simultaneously, its high-brightness warning light will flash, further enhancing the warning effect with a striking visual signal. Whether it is day or night, in a noisy working environment or a relatively quiet place, the audible and visual alarm 11, with its dual audible and visual alarm function, can promptly and effectively communicate any abnormal situation occurring within the confined space 1 to surrounding personnel, reminding them to react quickly and take appropriate safety measures. This effectively reduces the risk of safety accidents and provides comprehensive early warning protection for the safe operation of the confined space 1.

[0057] Ventilation equipment 12 is installed at the boundary between the interior and exterior of confined space 1 and is communicatively connected to controller 6. It is a key device for ensuring air quality within the confined space. Ventilation equipment 12 supplies outside air into confined space 1. The controller-controlled ventilation equipment 12 generates strong airflow to continuously deliver fresh outside air into confined space 1 through the ductwork. Simultaneously, the existing air within confined space 1 is also expelled by the airflow, thus achieving effective air replacement. The presence of the controller-controlled ventilation equipment 12 not only promptly reduces the concentration of harmful gases but also provides sufficient fresh air for personnel working in the confined space, fundamentally protecting their lives and health.

[0058] In this embodiment, the ventilation device 12 can be an axial flow fan or other air supply equipment, depending on the actual situation.

[0059] The controller 6 receives concentration data of hydrogen sulfide and ammonia in the confined space 1 from the hydrogen sulfide sensor 2 and the ammonia sensor 3. Based on the operator's access rights, the controller 6 controls the electromagnetic lock 4 to lock / unlock the protective door 5 and records the duration of the operator's work in the confined space 1. Based on the concentration data of hydrogen sulfide and ammonia in the confined space 1 sent by the hydrogen sulfide sensor 2 and the ammonia sensor 3 and the corresponding concentration threshold, the controller 6 controls the audible and visual alarm 11 to sound an alarm and simultaneously controls the ventilation equipment 12 to start. The controller 6 provides prompts or alarms based on the duration of the operator's work in the confined space 1 and the set work duration threshold.

[0060] It is understood that the above-mentioned functions of controller 6 can be easily implemented by those skilled in the art based on existing technology, and do not involve any improvement to the software program.

[0061] In this embodiment, the controller 6 can be an embedded controller, such as a PLC, or an open-source platform, such as ROS (Robot Operating System) and OpenPLC (Open Source Programmable Logic Controller).

[0062] The human-machine interface device 10 is communicatively connected to the controller 6. The human-machine interface device 10 allows setting permissions for staff entering the confined space 1, concentration thresholds, and working time thresholds. It also receives instructions from staff and displays concentration information, working time, prompts, and alarms. In this embodiment, the human-machine interface device 10 is a touch screen, but it can also be other input display devices, such as a keyboard, mouse, and display screen.

[0063] In this embodiment, the human-computer interaction device 10 includes a fingerprint recognition module, an ID recognition module, an iris recognition module, and / or a face recognition module. These identity recognition modules can be used individually or in combination according to actual security needs. For example, in some confined spaces with extremely high security requirements, fingerprint and iris recognition modules can be activated simultaneously for dual authentication, ensuring that only authorized personnel can enter. Through these advanced identity recognition modules, the human-computer interaction device 10 achieves more precise and efficient personnel access management, providing a solid guarantee for the security of the entire confined space security monitoring system.

[0064] It is understandable that the functions of the human-computer interaction device 10, the fingerprint recognition module, the ID recognition module, the iris recognition module, and the face recognition module are easily implemented by those skilled in the art based on existing technology, and do not involve improvements to the software program.

[0065] The remote platform 14 is connected to the controller 6 via the second wireless communication module 8. The remote platform 14 is used to receive data uploaded by the controller 6 and send control commands to the controller 6. It can also display the gas concentration curves, personnel entry and exit status and equipment operation status of each confined space 1 in real time. The remote platform 14 also supports searching historical data by project and time period and exporting Excel / PDF reports.

[0066] In this embodiment, the second wireless communication module includes:

[0067] The system includes a 4G / 5G network pass-through module, a Wi-Fi module, and / or a Bluetooth module. These modules can be used individually or in combination depending on the specific needs. The 4G / 5G network pass-through module leverages the widespread coverage of 4G / 5G networks to provide long-distance, high-speed data transmission capabilities. The Wi-Fi module is suitable for scenarios where there is stable Wi-Fi network coverage in a confined space. The Bluetooth module is typically used for short-range, low-power data transmission.

[0068] Power module 13 is electrically connected to hydrogen sulfide sensor 2, ammonia sensor 3, electromagnetic lock 4, human-machine interface device 10, and controller 6, respectively. Power module 13 provides power to these devices. It possesses powerful and flexible power supply capabilities, allowing direct connection to external AC power, whether standard 220V AC mains or other specific voltage levels. More importantly, power module 13 integrates power conversion functionality. Upon connection to AC power, it quickly and efficiently converts the AC power into DC power required by the system's devices. This conversion process employs high-precision voltage regulation and filtering technology to ensure stable and clean output DC power, preventing damage to the equipment caused by voltage fluctuations and current noise.

[0069] In this embodiment, the power module 13 includes a UPS (Uninterruptible Power Supply). The UPS has an energy storage function. Under normal power supply conditions, it connects to an external AC power source to power various devices in the system and simultaneously charge its built-in battery to store electrical energy. When a sudden power outage occurs in the external AC power supply, the UPS can respond within milliseconds and quickly switch to battery power mode. Through its internal inverter circuit, the DC power stored in the battery is converted into AC power to continuously power devices such as the hydrogen sulfide sensor 2, ammonia sensor 3, electromagnetic lock 4, human-machine interface device 10, and controller 6, ensuring the system continues to operate normally during power outages.

[0070] In this embodiment, it also includes:

[0071] Storage module 9, communicating with controller 6, stores concentration, working time, personnel entry and exit records, alarm records, and equipment operation records. Storage module 9 establishes a stable data transmission channel with controller 6 to store various key data generated during system operation. It accurately stores the concentration data of hydrogen sulfide and ammonia in confined space 1 collected by hydrogen sulfide sensor 2 and ammonia sensor 3. This data is meticulously archived according to time series, allowing staff to retrieve concentration information from different time periods at any time, providing a detailed data foundation for analyzing gas concentration variation patterns. Detailed records of each person entering and exiting confined space 1 are also completely stored in storage module 9. This includes personnel identification information such as name, employee number, department, and precise entry and exit times. These personnel entry and exit records facilitate real-time monitoring of personnel movements and allow for rapid retrieval of relevant personnel entry and exit information when tracing certain events. When controller 6 triggers an alarm based on abnormal conditions such as excessive gas concentration or excessive working time, storage module 9 responds quickly and records detailed alarm information. This includes the specific time of the alarm, the alarm type (such as hydrogen sulfide concentration alarm, ammonia concentration alarm, working duration alarm, etc.), and various environmental parameters and equipment operating status data within confined space 1 at the time of the alarm. These alarm records are of significant reference value for accident cause analysis, emergency plan improvement, and safety management optimization. The operating records of equipment such as ventilation equipment 12, electromagnetic lock 4, and audible and visual alarm 11 are also stored in storage module 9. Information such as equipment start-up time, stop time, running time, various parameters during operation, and whether any abnormal conditions occurred are recorded in detail. By analyzing these equipment operating records, managers can promptly identify potential equipment malfunctions, rationally arrange equipment maintenance plans, ensure that equipment is always in good operating condition, and guarantee the stable operation of the confined space 1 safety monitoring system.

[0072] In this embodiment, the controller 6, the first wireless communication module 7, the second wireless communication module 8, and the storage module 9 are installed inside the control box 15. The human-machine interface device 10 is installed on the panel of the control box 15. The control box 15 has an IP65 protection rating, which effectively prevents dust from entering the interior and ensures the stable operation of the internal equipment. At the same time, it can also protect against water spray from all directions, providing reliable protection for the internal equipment even in harsh working environments.

[0073] In this embodiment, it also includes:

[0074] An emergency door opening button 16 is installed inside the confined space 1. The emergency door opening button 16 is used to forcibly unlock the electromagnetic lock 4. In the event of a sudden emergency in the confined space 1, such as a fire or a serious gas leak that endangers the lives of personnel, trapped personnel can directly press the emergency door opening button 16. The emergency door opening button 16 has a direct electrical connection with the controller 6. Once the button is triggered, a control signal is quickly transmitted to the controller 6. Upon receiving the signal, the controller 6 immediately ignores other routine procedures such as authorization verification and directly sends an unlocking command to the electromagnetic lock 4, ensuring that the protective door 5 can be opened quickly, providing an emergency escape route for trapped personnel and maximizing their safety.

[0075] In this embodiment, it also includes:

[0076] The vibration alarm module, carried by the worker, communicates with the controller 6 via a second wireless communication module 8. The module receives alarm information from the controller 6 and triggers a vibration alarm. Upon receiving an alarm signal, the internal vibration device immediately activates, alerting the worker with a strong vibration. This vibration alarm method is particularly important in noisy, confined space working environments. The module directly affects the worker's sense of touch, ensuring they don't miss alarm information and can take timely safety measures, further reducing the risk of accidents and comprehensively protecting the safety of personnel working in confined spaces. The vibration alarm module can be implemented as a vibration alarm wristband worn on the worker's wrist.

[0077] In this embodiment, it also includes:

[0078] The video monitoring module 17, installed within the confined space 1, is communicatively connected to the remote platform 14 via the second wireless communication module 8 and electrically connected to the power supply module 13. Through the video monitoring module 17, the administrators of the remote platform 14 can view the operational status within the confined space 1 in real time, including the working status of personnel and the operating status of equipment. In the event of any abnormalities, such as sudden physical discomfort of personnel or equipment malfunction, the administrators can promptly detect and take appropriate rescue or handling measures. The video data captured by the video monitoring module 17 can also be stored on the remote platform 14 or a local storage device, serving as important data for subsequent accident analysis and work evaluation.

[0079] The workflow of the security control device for confined spaces in this embodiment is as follows:

[0080] The human-computer interaction device 10 is used to set the access permissions for staff to enter the confined space 1. The administrator can use ID, fingerprint, iris and / or face recognition to enter the information of staff allowed to enter the confined space 1 on the human-computer interaction device 10 and save it in the controller 6. The human-computer interaction device 10 is used to set the concentration thresholds for hydrogen sulfide and ammonia, as well as the working time threshold for staff to enter the confined space 1.

[0081] The concentration information of hydrogen sulfide and ammonia gas inside the confined space 1 is collected by a hydrogen sulfide sensor 2 and an ammonia gas sensor 3, respectively. After the concentration information of hydrogen sulfide or ammonia gas is collected, it is sent to the controller 6 through the first wireless communication module 7. The controller 6 transmits the concentration information of hydrogen sulfide or ammonia gas to the human-machine interaction device 10 for display and compares the concentration information of hydrogen sulfide or ammonia gas with the corresponding concentration threshold. When the concentration of hydrogen sulfide or ammonia gas exceeds the corresponding concentration threshold, the controller 6 controls the audible and visual alarm 11 to sound and light an alarm, controls the electromagnetic lock 4 to lock, and controls the ventilation device 12 to start, continuously delivering fresh air from the outside into the confined space 1 through the air duct. At the same time, the alarm information is uploaded to the remote platform 14 through the second wireless communication module 8 and transmitted to the human-machine interaction device 10 for display. The concentration information and alarm information are stored through the storage module 9. If there are staff members in the confined space 1, they can press the emergency door opening button 16 in the confined space 1. At this time, the controller 6 controls the electromagnetic lock 4 to unlock. External personnel need to be authorized through the remote platform 14 or use a mechanical key to unlock in an emergency, or forcibly unlock through the remote platform 14.

[0082] When a staff member prepares to enter confined space 1, they input authentication information on the human-machine interface device 10 for authorization. The controller 6 authenticates the staff member based on the authentication information and the stored staff member information. After successful authentication, the staff member confirms entry through the human-machine interface device 10. At this time, the controller 6 unlocks the electromagnetic lock 4 on the protective door 5 and starts a timer to record the staff member's working time in confined space 1. If the staff member's working time in confined space 1 exceeds the working time threshold, the controller 6 activates the audible and visual alarm 11 to sound an alarm and transmits the alarm information to the human-machine interface device 10 for display. Simultaneously, the alarm information is uploaded to the remote platform 14, where the working time information and alarm information are stored through the storage module 9. After the staff member leaves confined space 1, they confirm their departure through the human-machine interface device 10. At this time, the controller 6 locks the electromagnetic lock 4 on the protective door 5 and stops the timer; the storage module 9 records the entry event and the working time.

[0083] The remote platform 14 can display gas concentration curves, personnel entry and exit status, and equipment operation status in each confined space in real time. It can retrieve historical data by project and time period and export Excel / PDF reports. Administrators can remotely adjust concentration thresholds and working time thresholds, as well as forcibly control fans / electromagnetic locks through the remote platform 14.

[0084] Through the video monitoring module 17, the administrators of the remote platform 14 can view the work situation in the confined space 1 in real time, including the working status of personnel and the operating status of equipment.

[0085] Staff members carry a vibration alarm module with them. When an alarm event occurs, the controller 6 sends an alarm message to the vibration alarm module through the second wireless communication module 8. After receiving the alarm message from the controller 6, the vibration alarm module will trigger a vibration alarm.

[0086] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A security control device for confined spaces, characterized in that, include: A gas sensor is installed inside a confined space and is connected to the controller via a first wireless communication module. The gas sensor is used to collect the concentration information of key gases in the confined space and send it to the controller. An electromagnetic lock is installed on the protective door of the confined space and is communicatively connected to the controller; the electromagnetic lock is used to unlock / lock the protective door. An alarm device is installed outside the confined space and is communicatively connected to the controller; the alarm device is used for audible and visual alarms. A ventilation device is installed at the boundary between the interior and exterior of the confined space and is communicatively connected to the controller. The ventilation device is used to supply outside air to the confined space. The controller is configured to receive the concentration information of the key gas in the confined space sent by the gas sensor; control the electromagnetic lock to lock / unlock the protective door based on the operator's access rights, and record the working time of the operator in the confined space; control the alarm to sound an alarm based on the concentration information and the corresponding concentration threshold, and simultaneously control the ventilation equipment to start; and provide prompts or alarms based on the working time and the set working time threshold. A human-computer interaction device is communicatively connected to the controller. The human-computer interaction device is used to set the permission for staff to enter the confined space, the concentration threshold and the working time threshold, receive instructions from staff, and display the concentration information, working time, prompt information and alarm information. The remote platform is connected to the controller via a second wireless communication module. The remote platform is used to receive data uploaded by the controller and send control commands to the controller, and to display the gas concentration curves, personnel entry and exit status and equipment operation status of each of the confined spaces in real time. The power supply module is electrically connected to the gas sensor, electromagnetic lock, human-machine interface device and controller respectively.

2. The security control device for confined spaces according to claim 1, characterized in that, Also includes: The storage module is connected in communication with the controller. The storage module is used to store the concentration information, working time, personnel entry and exit records, alarm records and equipment operation records.

3. The security control device for confined spaces according to claim 2, characterized in that, Also includes: A control box is installed outside a confined space. The controller is installed inside the control box, and the human-machine interface device is installed on the panel of the control box. The protection level of the control box is IP65.

4. The security control device for confined spaces according to claim 3, characterized in that, The gas sensor includes: Hydrogen sulfide sensor, ammonia sensor, carbon dioxide sensor, oxygen sensor, volatile organic compound sensor and / or carbon monoxide sensor; or, All-in-one composite gas sensor.

5. The security control device for confined spaces according to claim 1, characterized in that, The power module includes: UPS (Uninterruptible Power Supply) 6. The security control device for confined spaces according to claim 1, characterized in that, The human-computer interaction device includes: Fingerprint recognition module, ID recognition module, iris recognition module and / or face recognition module.

7. The security control device for confined spaces according to claim 1, characterized in that, Also includes: An emergency unlocking button is installed inside the confined space. The emergency unlocking button is used to forcibly unlock the electromagnetic lock.

8. The security control device for confined spaces according to claim 1, characterized in that, Also includes: The vibration alarm module is carried by the staff member and communicates with the controller via a second wireless communication module. The vibration alarm module is used to receive alarm information from the controller and trigger a vibration alarm.

9. The security control device for confined spaces according to claim 1, characterized in that, The first wireless communication module includes: LoRa module, ZigBee module, NB-IoT module, Wi-Fi module or Bluetooth module.

10. The security control device for confined spaces according to claim 1, characterized in that, The second wireless communication module includes: 4G / 5G network pass-through module, Wi-Fi module and / or Bluetooth module.

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