CN105679005A - Rotating apparatus non-contact signal transmission apparatus based on LIFI and infrared light - Google Patents

Abstract

The invention discloses a non-contact signal transmission system of a rotating device based on visible light and infrared light, which belongs to the field of non-contact signal transmission. The electrical signal collected by the signal acquisition unit is transmitted from the rotating side of the rotating device to the base side of the rotating device. When the machine on the rotating side needs to be controlled, the control signal is transmitted from the base side of the rotating device to the rotating side of the rotating device. In this way, bidirectional transmission of multiple signals is realized. The photoelectric transmission coupling channel adopts different coupling methods according to different application requirements. In the uplink channel with a large amount of data transmission, it is composed of visible light LEDs and photomultiplier tubes. Visible light with a higher frequency is used for photoelectric coupling. In the downlink channel , select infrared light with simple structure for photoelectric coupling, which is composed of infrared LED and infrared receiving tube. This can not only effectively increase the transmission rate, but also simplify the structure and reduce the cost. At the same time, it also solves the problem of interference between channels, and provides a two-way, high-speed and reliable way for information transmission of rotating machinery.

Description

Non-contact signal transmission device for rotating machinery based on LIFI and infrared transmission

technical field

The invention relates to the field of signal transmission devices, in particular to a non-contact signal transmission device for rotating machinery based on LIFI and infrared transmission.

Background technique

In modern industry and life, rotating machinery is widely used. In the research, design and application of rotating machinery, it is necessary to obtain information on various parts of the rotor in a timely manner in order to accurately know the working state and movement of the rotor; at the same time, in order to control the rotating part, it is necessary to transfer the data of the host computer And the command is passed to the actuating element on the rotating part. Therefore, a two-way, high-speed, and stable information transmission channel is required between the host computer and the rotating machinery. The traditional signal transmission system of rotating parts relies on the contact transmission mode formed by the collector ring. This system with the mechanical contact of the brush to form a closed loop has many shortcomings, such as the friction between the rotor and the stator will inevitably produce Heat generation and noise, with the accumulation of heat and the enhancement of noise, will bring greater interference to the measurement circuit and cause the measurement signal to drift, which will eventually lead to deviations in the measured parameters, thereby affecting the stability of the system. In addition, vibration and shock will reduce the contact reliability between the brush and the slip ring, and will also introduce measurement errors. Other measurement methods include the telemetry system formed by radio. The radio data transmission method is susceptible to interference, has poor confidentiality, and because of its low carrier frequency, the transmission speed is greatly limited. Another commonly used non-contact measurement method is electromagnetic coupling transmission. This method has good performance, reliable transmission signal, strong anti-interference, and small error, but its biggest disadvantage is that the carrier frequency of the modulated signal is limited by the core cut-off The limitation of the frequency therefore limits the improvement of the transmission rate, and it is difficult to meet the needs of high-speed data transmission. The emerging photoelectric coupling technology, which uses light waves as the medium for signal transmission, has great potential for speed improvement. At present, infrared light is mostly used for photoelectric conversion. The designed system has the advantages of small size and good confidentiality, but the maximum speed can only reach 16Mbps, and high-speed transmission has not been realized. LIFI is a brand-new wireless data transmission technology, which realizes binary coding and sending of information through fast switching or switching of LED light source, and provides a new possibility for high-speed transmission of rotating machinery measurement and control signals.

Contents of the invention

In order to solve the problems of the prior art, the present invention provides a stable, bidirectional, high-speed non-contact signal transmission device for rotating machinery.

The invention comprises a rotating shaft, one end of the rotating shaft is connected with a rotating operation device, and the other end is connected with a rotation-side photoelectric signal transmission board and a base-side photoelectric signal transmission board; a sensor and an excitation element are installed on the rotating operation device; A signal acquisition module, a drive control module, a light drive circuit, a visible light LED and an infrared receiver are arranged on the photoelectric signal transmission board on the rotating side, and a first data processing module and a second data processing module are arranged on the photoelectric signal transmission board on the base side. , photomultiplier tube and infrared transmitter, wherein the light drive circuit, LED and photomultiplier tube form the first photocoupling module, and the infrared transmitter and infrared receiver form the second photocoupling module; the transmission test signal passes through the signal acquisition module, the second photocoupling module in sequence A photoelectric coupling module and the first data processing module are transmitted to the upper computer. This channel is called the uplink channel. The transmission control signal is transmitted to the drive control module through the upper computer, the second data processing module, and the second photoelectric coupling module. This channel is called the upstream channel. for the downlink channel.

In the upstream channel, the signal acquisition module processes the original signal collected from the sensor and then inputs it to the first photoelectric coupling module. The output of the first photoelectric coupling module is the input of the first data processing module, and the signal is transmitted to the host computer by the USB bus. That is, the transmission from the rotating side to the base is completed, so that the working state of the rotating side of the rotating device is monitored. In the downstream channel, the control signal enters the second data processing module from the USB bus, and is input to the second photocoupling module through the second data processing module. The output of the second photocoupling module is the input of the control drive module, which can excite the control elements. The signal acquisition module includes a signal sampling circuit and an encoder; the signal sampling circuit acquires the original signal of the piezoelectric sensor, the signal is encoded by the encoder, and then the signal is input to the first photoelectric coupling module. The first optocoupler module of the uplink channel includes a light drive circuit on the rotation side, an LED, and a photomultiplier tube on the base; the light drive circuit converts electrical signals into light signals, and transmits them to the photomultiplier on the base side through the switch of the LED. Tube. The first data processing module of the uplink channel includes a band-pass filter and a decoder; the optical signal received by the photomultiplier tube passes through the band-pass filter to remove clutter, obtains light within the required wavelength range and restores it to an electrical signal, and passes through the band-pass filter to remove clutter. After demodulation by the decoder, it is sent to the host computer for processing by USB. In the process of realizing the transmission of the control signal, the second data processing module of the downlink channel includes an encoder, and the control signal is modulated by the encoder before being transmitted by the second photoelectric coupling module of the downlink channel. The second photoelectric coupling module of the downlink channel includes an infrared transmitter and an infrared receiver, and the output of the infrared receiver is the input of the control drive module. The control drive module includes a decoder, a power amplifier and a drive circuit; the light signal received by the infrared receiver is converted into an electrical signal, and after being decoded and power amplified, the excitation element on the rotating machine is controlled.

As a further improvement, in order to reduce the interference of background light, the optical signal transmission plate on the rotation side and the optical signal transmission plate on the base side are located in the light-shielding box.

Further improvement, because the USB interface has the advantages of high transmission rate, small size, low price, convenient expansion, etc., the data processing module and the host computer are connected through the USB bus.

The beneficial effects of the present invention are:

1. Applying LIFI technology to the non-contact signal transmission of rotating machinery can greatly improve the information transmission rate and meet the needs of real-time measurement and control.

2. Different LED light sources are used for the uplink channel and downlink channel, which can effectively solve the interference problem between channels, and at the same time greatly optimize the system structure and reduce the cost.

3. When the system needs to measure multiple parameters, adding multiplexing technology to the structure can meet the needs of simultaneous measurement of multiple signals. Some improvements can also be made without departing from the principle of the present invention, and these improvements should also be regarded as the protection scope of the present invention.

Description of drawings

Fig. 1 is an overall structure diagram of the photoelectric coupling transmission device of the present invention.

Fig. 2 is a schematic diagram of the uplink channel photoelectric coupling transmission system.

Fig. 3 is a schematic diagram of the photoelectric coupling transmission system of the downlink channel.

detailed description

The present invention will be further described below in conjunction with accompanying drawing.

The overall structure of the photoelectric coupling transmission device of the present invention is shown in Figure 1, including a rotating shaft 2, one end of the rotating shaft 2 is connected to the rotating operation device 1, and the other end is connected to the rotating side photoelectric signal transmission board 3 and the base side photoelectric signal transmission board 5. Sensors and excitation elements are installed on the rotary operation device 1; a signal acquisition module, a drive control module, a light drive circuit, a visible light LED and an infrared receiver are provided on the rotary side photoelectric signal transmission board 3, basically The first data processing module, the second data processing module, a photomultiplier tube and an infrared transmitter are arranged on the seat side photoelectric signal transmission board 5, wherein the light drive circuit, the LED and the photomultiplier tube constitute the first photoelectric coupling module, and the infrared transmitter And the infrared receiver constitutes the second photoelectric coupling module; the transmission test signal is transmitted to the upper computer through the signal acquisition module, the first photoelectric coupling module, and the first data processing module in turn. This channel is called the uplink channel, and the transmission control signal passes through the upper computer in turn , the second data processing module, and the second photoelectric coupling module are transmitted to the drive control module, and this channel is called a downlink channel.

In order to reduce the interference of background light, the rotating side photoelectric signal transmission plate 3 and the base side photoelectric signal transmission plate 5 are located in the light shielding box 4 .

Because the USB interface has the advantages of high transmission rate, small size, low price, and convenient expansion, the data processing module and the host computer are connected through the USB bus.

The schematic diagram of the photoelectric coupling transmission system of the uplink channel is shown in Figure 2. In the uplink channel, because the test signal has the characteristics of large data volume, continuity, and high real-time requirements, the signal transmission has high requirements for speed. The present invention uses LIFI transmission Way. The sensor amplifies and filters the measured original signals such as voltage and charge in the signal acquisition circuit and outputs them as voltage signals; in the encoder, the change of the baseband signal is modulated into pulses according to certain rules, and the low frequency signal is modulated The pulse signal is converted into a high-frequency signal, and the pulse signal controls the switch of the visible light LED through the light driving circuit, so that the collected electrical signal is converted into a light signal. The photomultiplier tube on the side of the base is used to first receive the optical signal sent by the visible light LED in the photocoupling module. After entering the band-pass filter, it can filter out the influence of clutter that is not in the modulation range, leaving only the signal in the required wavelength range. optical signal, and demodulates the optical signal into an electrical signal. The decoder demodulates the modulated electrical signal and restores it to the original signal, and then sends the signal to the single-chip microcomputer for processing.

The schematic diagram of the photoelectric coupling transmission system for the downlink channel is shown in Figure 3. In the downlink channel, since the control signal data volume of the single-chip microcomputer is small, in order to simplify the system structure and avoid the interference problem between channels, the present invention chooses the infrared transmission mode. Because the infrared transmission process will not be interfered by the background light, and the control signal does not have more clutter than the test signal, so the work of filtering can be saved. The control signal sent by the single-chip computer calculated by the test signal is modulated into a high-frequency pulse signal in the encoder to control the switch of the infrared LED. The optical signal emitted by the infrared LED is received by the infrared receiver on the rotating side and decoded in the decoder to input power In the amplifier, the power amplifier amplifies the signal to drive the driver, thereby controlling the driver to work.

There are many specific application approaches of the present invention, and the above description is only a preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, some improvements can also be made without departing from the principles of the present invention. Improvements should also be regarded as the protection scope of the present invention.

Claims (3)

1. A non-contact signal transmission device for rotating machinery based on LIFI and infrared transmission, characterized in that it includes a rotating shaft (2), one end of which is connected to a rotating operating device (1), and the other end is connected to a rotating side The photoelectric signal transmission board (3) and the base side photoelectric signal transmission board (5); the said rotating operation device (1) is equipped with sensors and excitation elements; the said rotating side photoelectric signal transmission board (3) is equipped with There are a signal acquisition module, a drive control module, a light drive circuit, a visible light LED and an infrared receiver, and a first data processing module, a second data processing module, a photomultiplier tube and an infrared receiver are installed on the base side photoelectric signal transmission board (5). Transmitter, wherein the light drive circuit, LED and photomultiplier tube constitute the first photocoupling module, and the infrared transmitter and infrared receiver constitute the second photocoupling module; the transmission test signal passes through the signal acquisition module, the first photocoupling module, the second photocoupling module in sequence A data processing module is transmitted to the host computer, and the transmission control signal is transmitted to the drive control module through the host computer, the second data processing module, and the second photoelectric coupling module in sequence. 2. The rotating mechanical non-contact signal transmission device based on LIFI and infrared transmission according to claim 1, characterized in that: the rotating side photoelectric signal transmission plate (3) and the base side photoelectric signal transmission plate (5) It is located in the shade box (4). 3. The non-contact signal transmission device for rotating machinery based on LIFI and infrared transmission according to claim 1, characterized in that: the data processing module is connected to the host computer through a USB bus.