Three-wire elevator intercom system

Abstract

The utility model aims to provide the three-wire elevator intercom system which is good in anti-interference capability, high in system stability and low in cost. The elevator comprises a machine room unit, a pit unit, a car unit and a car roof unit, the machine room unit communicates with the pit unit, the car unit and the car roof unit through transmission lines, and the transmission lines comprise two sets of power lines and a set of signal voice transmission lines. The machine room unit, the pit unit, the car unit and the car roof unit all comprise connectors matched with the transmission lines. The utility model is applied to the technical field of intercom systems.

Description

Technical Field

[0001] This utility model applies to the technical field of intercom systems, and particularly relates to a three-line elevator intercom system. Background Technology

[0002] In traditional analog intercom systems, most currently use two-wire or four-wire systems. The advantages of traditional analog intercom systems, such as low wiring requirements, long transmission distance, low sound distortion, and low manufacturing costs, make them the preferred choice for most people.

[0003] Moreover, analog intercom systems are independent of other security systems and have unique advantages in troubleshooting and anti-interference capabilities. However, the current shortcomings of analog intercom systems should not be underestimated.

[0004] Currently, most traditional analog intercom systems use four-wire or two-wire transmission for voice and control signals. However, four-wire transmission increases wiring costs, and if a split-wire connection is used, the final wiring in the control room will appear messy and disorganized. If one wire malfunctions, troubleshooting will be very difficult, thus undoubtedly increasing both usage and maintenance costs.

[0005] If a two-wire system is used, most current two-wire systems employ differential signal transmission. To increase anti-interference capabilities, twisted-pair cables are required, placing high demands on cabling. Furthermore, due to the simultaneous transmission of voice and control signals and their inherent characteristics, during voice calls, if uninterrupted audio transmission is maintained, the voice and control signals can easily overlap, causing distortion and control failure. Moreover, due to the characteristics of voice and control signals, if control signals are transmitted during a voice call, both parties will hear noise from the control signals. If important messages need to be transmitted at this time, it can cause unpredictable losses. Additionally, for smooth voice communication, most systems use half-duplex mode, meaning only one party's voice can be transmitted through the system, preventing simultaneous two-way communication. Furthermore, in environments such as server rooms, where ambient noise is high, one end's voice may not be able to reach the other, resulting in communication failure.

[0006] If a two-way radio system with good anti-interference capabilities, high system stability, and low cost can be provided, the above-mentioned technical problems can be solved well. Utility Model Content

[0007] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a three-line elevator intercom system with good anti-interference ability, high system stability and low cost.

[0008] The technical solution adopted by this utility model is as follows: This utility model includes a computer room unit, a pit unit, a car unit, and a car top unit. The computer room unit communicates with the pit unit, the car unit, and the car top unit through a transmission line. The transmission line includes two sets of power lines and one set of signal and voice transmission lines. The computer room unit, the pit unit, the car unit, and the car top unit all include connectors that cooperate with the transmission line.

[0009] As can be seen from the above scheme, the transmission medium adopts a three-wire system, adding a signal and voice transmission line to the two power lines. Specifically, the call and hang-up signals forgo the more complex dual-tone audio signal transmission, using high and low level signals to represent calls and hang-up. This is identified by the high and low level signal acquisition in each unit's intercom system, which greatly increases the signal's anti-interference capability and system stability. Simultaneously, it ensures the stable operation of the elevator intercom equipment while maintaining a low overall cost.

[0010] In a preferred embodiment, the computer room unit, pit unit, car unit, and car top unit all further include a secondary power processing module, an MCU module, and an audio processing module. The secondary power processing module is connected to two sets of power lines via the connector and performs voltage conversion. The signal port of the connector is connected to the signal voice transmission line. The MCU module communicates with the signal port of the connector via an isolator. The communication port of the audio processing module is connected to the signal port of the connector via a conduction module. The MCU module communicates with the conduction module. The audio output terminal of the audio processing module is connected to a speaker, and the audio input terminal of the audio processing module is connected to a microphone.

[0011] In a preferred embodiment, the car roof unit further includes a power supply module, which is connected to the mains power supply for voltage conversion. Attached Figure Description

[0012] Figure 1 This is a system block diagram of this utility model;

[0013] Figure 2 This is the circuit schematic diagram of the computer room unit;

[0014] Figure 3 This is the circuit schematic diagram of the pit unit;

[0015] Figure 4 This is the circuit diagram of the car unit;

[0016] Figure 5 This is the first circuit schematic diagram of the car roof unit;

[0017] Figure 6This is the second circuit schematic diagram of the car roof unit. Detailed Implementation

[0018] like Figures 1 to 6 As shown, in this embodiment, the present invention includes a computer room unit 1, a pit unit 2, a car unit 3, and a car top unit 4. The computer room unit 1 communicates with the pit unit 2, the car unit 3, and the car top unit 4 via a transmission line 5. The transmission line 5 includes two sets of power lines and one set of signal and voice transmission lines. Each of the computer room unit 1, the pit unit 2, the car unit 3, and the car top unit 4 includes a connector that mates with the transmission line 5. The two sets of power lines provide power, and the signal and voice transmission lines transmit analog signals, using high and low level signals to indicate calling and hanging up, thereby greatly increasing the signal's anti-interference capability and the system's stability.

[0019] In this embodiment, the machine room unit 1, pit unit 2, car unit 3, and car top unit 4 each further include a secondary power processing module, an MCU module, and an audio processing module. The secondary power processing module is connected to two sets of power lines via the connector and performs voltage conversion. The signal port of the connector is connected to the signal voice transmission line. The MCU module communicates with the signal port of the connector via an isolator. The communication port of the audio processing module is connected to the signal port of the connector via a conduction module. The MCU module communicates with the conduction module. The audio output terminal of the audio processing module is connected to a speaker, and the audio input terminal of the audio processing module is connected to a microphone. The conduction module of the pit unit 2, car unit 3, and car top unit 4 includes three sets of sequentially coupled field-effect transistors (FETs) and transformers. The audio processing module includes an audio chip. The communication port of the audio chip is connected to one end of the transformer. The first terminal of the other end of the transformer is connected to the signal port of the connector. The second terminal of the other end of the transformer is connected to the power supply. The controlled terminals of the three sets of sequentially coupled FETs are connected between the second terminal of the other end of the transformer and the power supply. The control terminals of the three sets of sequentially coupled FETs are connected to the MCU module. The isolator is an optocoupler. The MCU module identifies the high and low levels fed back by the optocoupler and then connects the audio processing module to the signal port of the connector through the conduction module. The equipment room unit 1 matches different units with different high and low level signals. When the MCU module in each unit receives a high or low level signal that matches that unit, it activates the audio processing module, enabling the intercom device of that unit to communicate with the equipment room unit 1. High or low level signals that do not match the unit's signal are ignored. The intercom uses a speaker and microphone for audio playback and sound acquisition.

[0020] In this embodiment, the MCU module is an APM32F103 series processor. The audio chip is an AB187 series audio processor.

[0021] In this embodiment, the car roof unit 4 further includes a power supply module, which is connected to the mains power for voltage conversion, and the output terminal of the power supply module is connected to the two sets of power lines of the transmission line 5.

[0022] The equipment room unit 1, housed in the intercom system of the equipment room, is responsible for receiving and initiating calls, handling hang-up requests and conversation functions, and providing voltage to the voice lines of the entire system during a call. The pit equipment 2, housed in the intercom system of the pit, is responsible for receiving and initiating calls. After initiating a call, it waits for the equipment room to answer; once answered, it establishes an intercom with the equipment room, but cannot hang up itself. The car unit 3, housed in the intercom system of the car, is responsible for receiving and initiating calls. After initiating a call, it waits for the equipment room to answer; once answered, it establishes an intercom with the equipment room, but cannot hang up itself. The car top unit 4, housed in the intercom system of the car top, is responsible for receiving and initiating calls. After initiating a call, it waits for the equipment room to answer; once answered, it establishes an intercom with the equipment room, but cannot hang up itself. The car top section also integrates power supply and alarm functions, providing power to the entire system and activating the alarm upon receiving a call signal.

[0023] Although the embodiments of this utility model are described with reference to actual solutions, they do not constitute a limitation on the meaning of this utility model. For those skilled in the art, modifications to the implementation schemes and combinations with other schemes based on this specification are obvious.

Claims

1. A three-wire elevator intercom system, comprising a machine room unit (1), a pit unit (2), a car unit (3), and a car top unit (4), wherein the machine room unit (1) communicates with the pit unit (2), the car unit (3), and the car top unit (4) via a transmission line (5), characterized in that: The transmission line (5) includes two sets of power lines and one set of signal and voice transmission lines. The computer room unit (1), the pit unit (2), the car unit (3), and the car top unit (4) all include connectors that cooperate with the transmission line (5).

2. The three-line elevator intercom system according to claim 1, characterized in that: The machine room unit (1), pit unit (2), car unit (3), and car top unit (4) all include a secondary power processing module, an MCU module, and an audio processing module. The secondary power processing module is connected to two sets of power lines through the connector and performs voltage conversion. The signal port of the connector is connected to the signal voice transmission line. The MCU module communicates with the signal port of the connector through an isolator. The communication port of the audio processing module is connected to the signal port of the connector through a conduction module. The MCU module communicates with the conduction module. The audio output terminal of the audio processing module is connected to a speaker, and the audio input terminal of the audio processing module is connected to a microphone.

3. A three-line elevator intercom system according to claim 2, characterized in that: The car roof unit (4) also includes a power supply module, which is connected to the mains power supply for voltage conversion.

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