Construction elevator people number detection and early warning system based on infrared technology
By combining infrared thermal imaging sensors and multiple sets of infrared photoelectric sensors, the problem of accuracy in detecting the number of people in construction elevators has been solved, achieving low-cost and efficient detection of the number of people in construction elevators and overload warning, thus improving construction safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-03-13
AI Technical Summary
Existing construction elevator passenger detection devices, while ensuring low cost, struggle to achieve accurate detection and are easily affected by human factors.
It employs a combination of infrared thermal imaging sensors and multiple sets of infrared photoelectric sensors to detect the number of people by detecting the number of heat sources, and performs accurate calculations and overload alarms through a signal processing module.
It enables accurate detection of the number of people in construction elevators and overload warning at low cost, improving construction safety and detection reliability.
Smart Images
Figure CN223990781U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of construction elevator technology, specifically to a construction elevator personnel detection and early warning system based on infrared technology. Background Technology
[0002] Construction elevators are indispensable equipment in construction projects for the vertical transportation of personnel and materials. Their maximum capacity is typically determined through extensive simulation experiments based on design specifications and load-bearing capacity. This is crucial for the normal operation of construction elevators and for ensuring the safety of workers.
[0003] Currently, methods for detecting the number of people in construction elevators mainly include computer vision-based methods, weight-based methods, and methods based on wireless and Bluetooth technologies. Wireless and Bluetooth-based methods require passengers to carry specific devices when entering the elevator; the number of people detected is directly related to the number of devices carried. However, this method is susceptible to human factors, such as forgetting to carry devices or device malfunctions. Weight-based detection methods measure the overall load by installing weight sensors inside the elevator to estimate the number of people. However, weight sensors cannot accurately distinguish between the weight of people and goods, and there may be significant errors in the number estimation. Image-based detection methods install high-definition cameras inside the elevator car and use computer vision algorithms to analyze video images to accurately calculate the number of people inside the elevator. While this method provides a relatively accurate number detection solution, it also places high demands on the quality of the cameras and the design of the technical software, resulting in higher costs.
[0004] In summary, existing technologies for detecting the number of people in construction elevators, while ensuring low cost, struggle to accurately detect the number of people on board. Utility Model Content
[0005] To address the aforementioned problems in the prior art, this utility model provides a construction elevator passenger detection and early warning system based on infrared technology, which solves the problem that existing construction elevator passenger detection devices are difficult to accurately detect the number of passengers while ensuring low cost.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0007] An infrared technology-based construction elevator personnel detection and early warning system is provided, including a construction elevator. The top of the construction elevator is equipped with an alarm for warning of overload and an infrared thermal imaging sensor for detecting the number of heat sources. Multiple sets of infrared photoelectric sensors are installed on the elevator doors. The alarm, infrared thermal imaging sensor and multiple sets of infrared photoelectric sensors are all electrically connected to a signal processing module.
[0008] In this solution, multiple sets of infrared photoelectric sensors are used to detect when personnel enter and exit the construction elevator. When any set of infrared photoelectric sensors is triggered, the infrared thermal imaging sensor updates the number of heat sources in the construction elevator and transmits this number to the signal processing module. The signal processing module determines the number of people in the construction elevator based on the number of heat sources. Simultaneously, if the number of people exceeds the limit, the signal processing module will trigger an alarm to warn construction workers to pay attention to construction safety. This solution has a simple structure and low installation cost. Compared to Bluetooth wireless devices and weight sensors, the infrared thermal imaging sensor can more accurately detect the number of people by detecting heat sources. Furthermore, by using multiple sets of infrared photoelectric sensors to trigger the infrared thermal imaging sensor, the system maintains the number of people information during construction. This not only avoids or reduces the possibility of errors in the number of people due to continuous heat sources formed by workers approaching each other during construction, but also reduces the working time of the infrared thermal imaging sensor and extends its service life.
[0009] Furthermore, it also includes a display installed inside the construction elevator. The display is electrically connected to the signal processing module and is used to show the number of people inside the construction elevator. The display allows construction workers to directly see the current number of people inside the construction elevator, increasing transparency, reducing the possibility of overloading, and improving safety.
[0010] Furthermore, the signal processing module is integrated behind the display, which is embedded inside the construction elevator. This integrated design, placing the signal processing module on the display and embedding it inside the construction elevator, simplifies system installation and maintenance while maintaining a clean and tidy interior space.
[0011] Furthermore, the display is located on the end face of the construction elevator away from the elevator doors. This placement of the display makes it easily visible to construction workers when they enter the construction elevator.
[0012] Furthermore, the monitor is positioned 150–170 cm above the ground. This ergonomic height ensures that most adults can easily view the information on the monitor without having to look up or down.
[0013] Furthermore, each set of infrared photoelectric sensors includes two through-beam photoelectric sensors symmetrically arranged on both sides of the elevator door.
[0014] Furthermore, the infrared photoelectric sensor consists of three sets, positioned at distances of 40-50cm, 80-90cm, and 120-130cm from the bottom of the construction elevator, respectively. The three sets of infrared photoelectric sensors at different heights provide comprehensive detection of personnel entering and exiting the elevator, preventing workers from bending over to move in and out while carrying items.
[0015] Furthermore, the infrared thermal imaging sensor is fixed to the center of the inner top of the construction elevator. This placement of the infrared thermal imaging sensor ensures effective detection of the body heat of all construction personnel, thereby guaranteeing the integrity and accuracy of the thermal imaging data.
[0016] Furthermore, the alarm is fixed in a corner of the ceiling inside the construction elevator. This placement of the alarm ensures that the warning sound is effectively transmitted and is not easily overlooked.
[0017] Furthermore, the signal processing module includes a Raspberry Pi connected to a power source. The Raspberry Pi is a microcomputer about the size of a credit card, offering host computer functionality at a good price.
[0018] This utility model discloses a construction elevator personnel detection and early warning system based on infrared technology, the beneficial effects of which are:
[0019] 1. This utility model utilizes an infrared thermal imaging thermal sensor to detect the number of heat sources from construction workers to reflect the number of people inside the construction elevator. It also uses multiple sets of infrared photoelectric sensors to detect when people enter and exit the construction elevator, thereby updating the data of the infrared thermal imaging thermal sensor and transmitting it to the signal processing module to obtain the number of passengers. This achieves accurate detection of the number of people inside the construction elevator while ensuring low cost. In addition, if the number of people exceeds the limit, an alarm will be triggered to improve construction safety.
[0020] 2. This utility model has low installation and setup requirements, is simple to operate and highly reliable, and can achieve accurate detection of the number of people, judgment of personnel entry and exit, accurate identification of people and objects, and early warning of overload. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of a construction elevator personnel detection and early warning system based on infrared technology.
[0022] The components include: 1. Alarm; 2. Infrared thermal imaging sensor; 3. Display; 4. Signal processing module; 5. Infrared photoelectric sensor. Detailed Implementation
[0023] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.
[0024] This embodiment provides a construction elevator personnel detection and early warning system based on infrared technology. By combining an infrared photoelectric sensor 5 and an infrared thermal imaging sensor, it achieves accurate personnel detection and overload warning. It is not only low in cost and simple to install, but also highly efficient and accurate in detection. It will be shown in detail below.
[0025] refer to Figure 1 A construction elevator personnel detection and early warning system based on infrared technology includes an alarm 1, an infrared thermal imaging thermal sensor 2, a display 3, a signal processing module 4, and multiple sets of infrared photoelectric sensors 5.
[0026] Alarm 1 is installed in a corner of the top of the construction elevator, preferably in the upper left corner. Alarm 1 is used to sound an alarm when the number of passengers exceeds the maximum capacity.
[0027] Infrared thermal imaging sensor 2 is fixed to the center of the inner top of the construction elevator to detect the number of heat sources emanating from construction workers. The infrared thermal imaging sensor generates images by detecting the amount of thermal radiation emitted by objects. Since the human body has a higher temperature than the environment and other objects (such as building materials), it appears very prominent in the thermal imaging image. Based on this principle, infrared thermal imaging sensor 2 can be used to detect the number of heat sources inside the construction elevator, thereby estimating the number of occupants. In this embodiment, the infrared thermal imaging sensor is selected from the Hikvision Pan-Security Observation PTZ series.
[0028] Display 3 is an LED electronic display screen, embedded on the end face of the construction elevator away from the elevator door, used to display the current number of people inside the elevator. In this embodiment, display 3 is 150-170cm above the ground.
[0029] Signal processing module 4 is integrated on the back of the display module. It processes the signals received from the sensor and transmits the processed information to the display module and the alarm module. In this embodiment, signal processing module 4 includes a Raspberry Pi connected to a power source.
[0030] Multiple sets of infrared photoelectric sensors 5 are installed on the doors of the construction elevator. Each set of infrared photoelectric sensors 5 includes two through-beam photoelectric sensors symmetrically arranged on both sides of the elevator doors, serving as both a transmitter and a receiver. To achieve full coverage detection of personnel entering and exiting, three sets of infrared photoelectric sensors 5 are used, positioned at distances of 40–50 cm, 80–90 cm, and 120–130 cm from the bottom of the construction elevator, respectively.
[0031] In this embodiment, the alarm 1, the infrared thermal imaging thermal sensor 2, the display 3, and multiple sets of infrared photoelectric sensors 5 are all electrically connected to the signal processing module 4.
[0032] In summary, the working principle of this solution is as follows:
[0033] The number of people inside the construction elevator is initialized to 0, and the maximum capacity is set according to the actual specifications of the construction elevator. Multiple sets of infrared photoelectric sensors 5 are used to detect when personnel enter and exit the construction elevator. When any set of infrared photoelectric sensors 5 is triggered, the infrared thermal imaging thermal sensor 2 updates the number of heat sources in the construction elevator and transmits the number of heat sources to the signal processing module 4. The signal processing module 4 obtains the number of people inside the construction elevator based on the number of heat sources. At the same time, if the number of people is overloaded, the signal processing module 4 will trigger the alarm 1 to sound an alarm, warning construction personnel to pay attention to construction safety.
[0034] This solution uses multiple sets of infrared photoelectric sensors 5 to trigger the infrared thermal imaging sensor 2. The infrared thermal imaging sensor 2 operates for a set period of time when the infrared photoelectric sensor 5 is triggered. The set period of time takes into account the situation where construction workers may form a heat source due to close proximity when entering the elevator. The set period of time can cover the time when two construction workers separate after entering the elevator and form two heat sources again. At the same time, the infrared thermal imaging sensor 2 updates the signal processing module 4 according to the maximum number of heat sources detected, ensuring the safety of the construction elevator operation.
[0035] The infrared thermal imaging thermal sensor 2 starts working after being triggered by the infrared photoelectric sensor 5. It can detect the number of people in the elevator. This not only avoids the phenomenon of incorrect numbering caused by construction workers getting close to each other during construction and forming a continuous heat source, but also reduces the working time of the infrared thermal imaging thermal sensor 2 and improves its service life.
[0036] Although the specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.
Claims
1. A construction elevator passenger number detection and early warning system based on infrared technology, characterized in that, The construction elevator is provided with an alarm (1) for warning overloading and an infrared thermal imaging thermal sensor (2) for detecting the number of heat sources on the inner top of the construction elevator, and a plurality of infrared photoelectric sensors (5) are arranged on the door of the construction elevator; wherein the alarm (1), the infrared thermal imaging thermal sensor (2) and the plurality of infrared photoelectric sensors (5) are electrically connected with a signal processing module (4).
2. The construction elevator passenger number detection and early warning system based on infrared technology according to claim 1, characterized in that, Further comprising a display (3) arranged in the interior of the construction elevator, the display (3) is electrically connected with the signal processing module (4) and used for displaying the number of people in the construction elevator.
3. The construction elevator passenger number detection and early warning system based on infrared technology according to claim 2, characterized in that, The signal processing module (4) is integrated behind the display (3), and the display (3) is embedded in the interior of the construction elevator.
4. The construction elevator passenger number detection and early warning system based on infrared technology according to claim 3, characterized in that, The display (3) is located on the end face of the construction elevator away from the door.
5. The construction elevator passenger number detection and early warning system based on infrared technology according to claim 4, characterized in that, The height of the display (3) from the ground is 150-170 cm.
6. The construction elevator passenger number detection and early warning system based on infrared technology according to claim 1, characterized in that, Each group of infrared photoelectric sensors (5) includes two symmetrical transmission type photoelectric sensors arranged on both sides of the door of the construction elevator.
7. The construction elevator passenger number detection and early warning system based on infrared technology according to claim 1, characterized in that, The number of groups of infrared photoelectric sensors (5) is three, and the three groups of infrared photoelectric sensors (5) are respectively 40-50 cm, 80-90 cm and 120-130 cm away from the bottom of the construction elevator. 8.The construction elevator passenger number detection and early warning system based on infrared technology of claim 1, wherein, The infrared thermal imaging thermal sensor (2) is fixed on the center of the inner top of the construction elevator. 9.The construction elevator passenger number detection and early warning system based on infrared technology of claim 1, wherein, The alarm (1) is fixed at the corner of the inner top of the construction elevator. 10.The construction elevator passenger number detection and early warning system based on infrared technology of claim 1, wherein, The signal processing module (4) includes a Raspberry Pi connected with a power supply.