Two-way visual intercom system for elevator of subway station

Abstract

The utility model relates to elevator intercom technical field, concretely is a kind of elevator two-way visual intercom system for subway station, including elevator side part, transmission layer architecture and car control room side integrated system, elevator side part is integrated car terminal, five-way intercom unit and dome camera by distributed POE equipment, transmission layer uses single-mode optical fiber backbone network and VLAN isolation technology to realize low-delay audio and video transmission, car control room side is integrated SIP protocol stack, video management and information publishing function by industrial-grade host computer, support one-key lock elevator and multi-elevator split-screen monitoring. System is compatible with existing elevator intercom equipment through five-way intercom converter, realize new and old system intercommunication, solve the problem that traditional scheme wiring is complex, response delay is high, function is single, significantly improve emergency rescue efficiency.

Description

Technical Field

[0001] This utility model relates to the field of elevator intercom technology, specifically a two-way visual intercom system for elevators in subway stations. Background Technology

[0002] As a critical facility in high-density passenger flow scenarios, the safety monitoring and emergency communication of subway elevators are of paramount importance. Traditional elevator intercom systems have the following drawbacks: existing five-way intercoms only support voice communication, and the video monitoring system operates independently, making it impossible to establish visual two-way communication when passengers are trapped in the elevator, exacerbating panic; older elevators use the RS485 bus protocol, and newer IP devices require additional gateway conversion, resulting in high deployment costs and high failure rates; traditional cable wiring is susceptible to electromagnetic interference, video transmission delays exceed 500ms, and operators need to operate multiple devices (PBX, monitoring screen) to initiate rescue, delaying response time.

[0003] Therefore, there is an urgent need for a two-way communication system that integrates audio and video transmission, has strong protocol compatibility, and possesses rapid emergency response capabilities. Utility Model Content

[0004] The purpose of this invention is to provide a two-way video intercom system for elevators in subway stations to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A two-way video intercom system for elevators in subway stations includes elevator-side components, a transmission layer architecture, and a vehicle control room-side integrated system. The elevator-side components include a car visualization terminal, a distributed data acquisition unit, and a linkage control box. The transport layer architecture includes a single-mode fiber optic backbone network and photoelectric conversion modules; The photoelectric conversion module includes an SFP optical module located inside the elevator-side control box and an optical convergence switch located in the vehicle control room. The integrated system in the vehicle control room includes a video intercom host, a high-definition camera in the vehicle control room, and auxiliary equipment.

[0006] Preferably, the car visualization terminal integrates an integrated touch screen, a wide-angle camera, a microphone, and a speaker.

[0007] Preferably, the distributed acquisition unit includes PoE intercom units and car dome cameras distributed in the hall door, car top, pit, and equipment room.

[0008] Preferably, the linkage control box has a built-in POE optoelectronic switch and a five-way intercom converter.

[0009] Preferably, the video intercom host integrates a SIP protocol stack, a video management platform, and an information publishing system.

[0010] Preferably, one end of the five-way intercom converter is connected to the original RS485 intercom line in the elevator, and the other end is connected to the POE optoelectronic switch through a network bridge to achieve interoperability between the old and new system protocols.

[0011] Preferably, the car visualization terminal and the distributed acquisition unit are directly connected to the POE optoelectronic switch via a network cable to form a five-way intercom network and obtain POE power supply.

[0012] Preferably, in the transport layer architecture, the bandwidth occupied by a single video stream is ≤4Mbps, the call latency is <200ms, and the fiber optic backbone network replaces 60% of traditional cables.

[0013] Preferably, the video intercom host has a built-in relay output card that generates an elevator locking command, which is transmitted to the car terminal via the network and triggers a switch signal to the elevator control cabinet.

[0014] Preferably, the information publishing system pushes customized content for each elevator to the car terminal via JSON format announcement packages, supporting full-screen carousel of images, text, and videos.

[0015] Compared with the prior art, the beneficial effects of this utility model are: by synchronizing 1080P video and audio in real time with the car terminal and the vehicle control room, the call delay is less than 200ms, which significantly reduces passenger anxiety.

[0016] By bridging RS485 and IP networks through a five-way intercom converter, the original elevator intercom lines are retained, saving on renovation costs.

[0017] Supporting a transmission distance of 20km with single-mode fiber and VLAN isolation technology ensures that a single video stream has a bandwidth usage of ≤4Mbps, enabling simultaneous monitoring of multiple elevator 720P video streams on the same screen.

[0018] The system can send a locking command to the elevator with one click from the main unit and automatically record dual-track audio and video files to improve the standardization of rescue operations. Attached Figure Description

[0019] Figure 1 This is an architecture diagram of a two-way video intercom system for elevators in subway stations.

[0020] Figure 2 This is a schematic diagram of the operation process of a two-way video intercom system for elevators in subway stations.

[0021] Among them: elevator side components 10, transmission layer architecture 20, and vehicle control room side integrated system 30. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] Please see Figure 1 A two-way visual intercom system for elevators in subway stations includes three parts: elevator-side components 10, transmission layer architecture 20, and vehicle control room-side integrated system 30. Elevator side component 10 is equipped with a car visualization terminal, a distributed acquisition unit, and a linkage control box; the car visualization terminal integrates a 7-12 inch touch screen, a wide-angle camera, a microphone, and a speaker. The distributed acquisition unit includes PoE intercom units (with call buttons) installed at the hall doors on each floor, waterproof PoE intercom units deployed on the car top / pit / machine room, and a hemispherical camera (1080P resolution) installed on the top of the car. The linkage control box has a built-in POE optical switch (8 ports) and a five-way intercom converter (compatible with RS485 protocol). That is, the car visualization terminal is directly connected to the port of the PoE switch in the linkage control box via a network cable, and simultaneously obtains power supply and data transmission. The PoE intercom units and cameras in the car / hall door / car top / pit / machine room are all connected to the PoE optical switch via network cable to form a five-way intercom network. The five-way intercom converter connects to the existing elevator intercom circuit on one end and to the POE optical switch via a network bridge on the other end, enabling interoperability between the old and new system protocols. When a passenger triggers the call button on the car terminal, the hemispherical camera automatically starts capturing the scene inside the car, while the screen displays a real-time video feed of the control room staff, establishing a two-way visual communication channel and significantly reducing the anxiety of trapped passengers.

[0027] The transmission layer architecture 20 includes an optical fiber backbone network and an optoelectronic conversion module. The optical fiber backbone network uses single-mode optical fiber with a maximum transmission distance of more than 20km. The optoelectronic conversion module includes an SFP optical module located inside the elevator side control box and an optical aggregation switch located on the vehicle control room side. It uses 24 gigabit ports and is also configured with four SFP+ slots. Among them, the POE optoelectronic switch of each elevator outputs optoelectronic signals through SFP optical modules, which are directly connected to the optical aggregation switch in the vehicle control room via the optical fiber backbone network. The optical aggregation switch aggregates multiple elevator signals and distributes the data to the video intercom host via network cable; Meanwhile, VLAN segmentation technology is used to isolate the communication streams of each elevator, ensuring call privacy and bandwidth stability. The single-channel video usage is ≤4Mbps, which means that the fiber optic network can carry high-definition video streams (720P / 30fps) and two-way audio, while the call latency is <200ms, meeting the real-time requirements of emergency rescue. At the same time, the amount of traditional cable wiring is reduced by 60%, reducing the risk of electromagnetic interference.

[0028] The integrated system in the vehicle control room includes a multi-functional video intercom host, a high-definition camera in the vehicle control room, and auxiliary equipment. The video intercom host uses an industrial-grade PC and integrates a SIP protocol stack, a video management platform, and an information publishing system. The SIP protocol stack replaces the PBX to handle call routing and number allocation. The video management platform is used to decode video streams from the car / vehicle control room and supports 16-channel simultaneous monitoring. The information publishing system can arrange text / image / video announcements. The high-definition camera in the vehicle control room uses a 2-megapixel wide-angle lens to cover the work area of ​​the on-duty staff; The auxiliary equipment includes a noise-canceling microphone array and an emergency physical call button; Among them, the optical aggregation switch is directly connected to the gigabit network port of the intercom host via a network cable to input real-time audio and video data from all elevators, and the high-definition camera in the vehicle control room is connected to the host via a USB 3.0 interface to capture video footage from the duty officer. The main unit has a built-in relay output card that generates a lock command → which is transmitted via the network → to the car terminal → to the elevator control cabinet via a switch signal. The host computer implements the functions of the original program-controlled exchange through software virtualization, saving 1U rack space and independent equipment maintenance costs: it automatically records audio and video during calls (stored as MP4+WAV dual-track files), and clicking the entrapment alarm sign → sends a lock elevator command with one click (response time < 1 second). During non-call hours, the main unit pushes announcements (such as "Last Train Time Reminder") to all car terminals. It supports customized advertising content for each elevator (templates can be edited through the host backend), etc.

[0029] Please see Figure 2 In one embodiment of the present invention, based on the operation process of the above system: Call Initiation: The trapped person presses the call button on the car terminal → The terminal sends a SIP INVITE request to the host, and the host automatically pops up the elevator monitoring screen and rings the bell to alert the duty officer; Two-way call establishment: The duty officer clicks to answer the call → The host encodes the high-definition camera image in the vehicle control room into an H.264 stream → Transmits it to the car terminal via the fiber optic network, and the car terminal simultaneously uploads the car interior video to the host, forming a two-way video call; Emergency Response: The duty officer sends a "lock elevator" command through the main unit interface → the car terminal triggers the relay to close → outputs a DC24V pulse to the elevator control cabinet, and the main unit automatically stores the entire video of this event (retained for at least 90 days). Information dissemination (routine status): The host periodically sends JSON format announcement packets to idle terminals → the terminals parse the packets and display full-screen carousel text and image information.

[0030] It should be understood that in this application, all rotating, sliding, meshing, belt-driven and other moving parts are well lubricated and not prone to slippage or wear, and each part is provided with a corresponding protective shell. However, in the accompanying drawings of this application, the connection state of each moving part is not shown. It should also be understood that all parts in this application are made of metal or plastic materials with suitable strength in the relevant field to ensure that their structural rigidity meets the actual requirements.

[0031] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A two-way visual intercom system for elevators in subway stations, characterized in that, It includes elevator-side components (10), transmission layer architecture (20), and vehicle control room-side integrated system (30). The elevator side component (10) includes a car visualization terminal, a distributed acquisition unit, and a linkage control box; The transmission layer architecture (20) includes a single-mode fiber optic backbone network and a photoelectric conversion module; The photoelectric conversion module includes an SFP optical module located inside the elevator-side control box and an optical convergence switch located on the vehicle control room side. The vehicle control room integrated system (30) includes a video intercom host, a vehicle control room high-definition camera and auxiliary equipment; The linkage control box has a built-in POE optoelectronic switch and a five-way intercom converter. The video intercom host integrates a SIP protocol stack, a video management platform, and an information publishing system; The five-way intercom converter connects to the original RS485 intercom line in the elevator on one end and to the POE optical switch on the other end via a network bridge, enabling interoperability between the old and new system protocols. The car visualization terminal and the distributed acquisition unit are directly connected to the POE optoelectronic switch via a network cable to form a five-way intercom network and obtain POE power supply.

2. The elevator two-way video intercom system for subway stations according to claim 1, characterized in that, The car visualization terminal integrates an integrated touch screen, a wide-angle camera, a microphone, and a speaker.

3. The two-way video intercom system for subway elevators according to claim 2, characterized in that, The distributed acquisition unit includes PoE intercom units and car dome cameras distributed in the hall door, car top, pit, and equipment room.

4. The elevator two-way video intercom system for subway stations according to claim 3, characterized in that, In the aforementioned transmission layer architecture, a single video stream occupies a bandwidth of ≤4Mbps, the call latency is <200ms, and the fiber optic backbone network replaces 60% of traditional cables.

5. The elevator two-way video intercom system for subway stations according to claim 4, characterized in that, The video intercom host has a built-in relay output card that generates a lock command, which is transmitted to the car terminal via the network and triggers a switch signal to the elevator control cabinet.

6. The elevator two-way video intercom system for subway stations according to claim 5, characterized in that, The information publishing system pushes customized content for each elevator to the car terminal via JSON format announcement packets, supporting full-screen carousel of images, text, and videos.

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