A photoelectric triple pitch transmitter

Abstract

The present invention relates to a photoelectric triple pitch transmitter, comprising a rotating shaft, a housing, a support frame, an output circuit board, a photoelectric receiving unit, a code disk, and a light source. A plurality of code disks are arranged at intervals on the rotating shaft to form a moving disk of a photoelectric encoder. The static disk corresponding to the moving disk is composed of a plurality of support frames, an output circuit board mounted on the support frames, and a photoelectric receiving unit. A plurality of light sources are arranged in the housing at the positions corresponding to the moving disk and the static disk of each group. The present invention realizes triple measurement of the pitch angle, and solves the problem of simultaneously providing a pitch feedback signal and a pitch indication signal to the electronic control system. The zero pitch is matched with a specific digital code on the photoelectric encoding disk, thereby eliminating the zero position switch; the photoelectric adopts a watertight aviation plug, replacing the conventional terminal solution, to ensure correct, convenient, and reliable wiring, while also reducing the volume of the pitch transmitter.

Description

Technical Field

[0001] The invention relates to a pitch controllable propeller device of a ship propulsion system, in particular to a pitch transmitter used for the pitch controllable propeller device. Background Art

[0002] A photoelectric encoder is a sensor that uses photoelectric conversion to output angular and length information in an encoded form. When used for pitch angle measurement, a photoelectric encoder converts the mechanical pitch angle into an information-based electrical signal, providing pitch feedback and a pitch indication signal to the electronic control system. Currently, pitch indicators widely use a resistive potentiometer to measure pitch angle. The resistive potentiometer is mounted on a bracket and connected to the oil distributor's rotating shaft via a coupling and a connecting shaft. A cam fixed to the connecting shaft activates a microswitch as the rotation angle changes, providing feedback to the control system indicating the propeller's zero pitch position. This design makes the pitch indicator relatively complex and wiring cumbersome. The pitch angle measurement accuracy is limited by the data acquisition equipment and the potentiometer itself, resulting in low precision. Furthermore, resistive potentiometers are susceptible to temperature and electromagnetic interference, which can cause fluctuations in the output pitch angle signal. With the development of controllable pitch propeller systems, pitch indicators with simpler structures, higher precision, and improved interference resistance are required. Therefore, a pitch indicator with simple structure, high precision, and good interference resistance is urgently needed. Summary of the Invention

[0003] The present invention aims to provide a photoelectric triple pitch indicator for providing a pitch feedback signal and a pitch indication signal to an electronic control system, thereby solving the problems of the existing pitch indicator using a resistive potentiometer, such as complex structure, cumbersome wiring, low measurement accuracy, and susceptibility to temperature and electromagnetic interference, thereby improving the working stability, ease of use and maintainability of the pitch indicator.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: a photoelectric triple pitch transmitter, comprising a rotating shaft, a shell, a support frame, an output circuit board, a photoelectric receiving unit, a code disk, and a light source. Multiple code disks are arranged at intervals on the rotating shaft to form the moving disk of the photoelectric encoder. The static disk corresponding to the moving disk is composed of multiple support frames, an output circuit board installed on the support frame, and a photoelectric receiving unit. Multiple light sources are arranged in the shell corresponding to the moving disk and static disk of each group.

[0005] Furthermore, the support frame is connected to the shell, and the output circuit board is fastened to the support frame by screws.

[0006] Furthermore, the photoelectric receiving unit is welded on the output circuit board and is used to receive the optical signal emitted by the light source and convert the optical signal into an electrical signal.

[0007] Furthermore, the output circuit board receives the binary code or Gray code formed on the photoelectric receiving element and converts it into an RS485 digital signal and an analog 4-20mA current signal.

[0008] Furthermore, one end of the rotating shaft is connected to the housing through a rolling bearing and can rotate freely relative to the housing, and the other end is fixedly connected to the moving plate through an interference fit.

[0009] Furthermore, the photoelectric triple pitch indicator is fixed to the pitch indicating mechanism of the oil distributor by screws, and the rotating shaft is connected to the rotating part of the pitch indicating mechanism by an elastic coupling.

[0010] The beneficial effects of the present invention are:

[0011] The present invention uses three 12-bit absolute optical encoder disks as the main components. After the optical signal is processed, each encoder disk can output a mutually isolated RS485 digital signal and an analog 4-20mA current signal. Because the code disks of the three photoelectric encoders are fixed on the same rotating shaft, the rotation of the rotating shaft drives the code disks to rotate synchronously. The rotation angles of the three code disks are consistent, thereby ensuring the consistency of the angular electrical signals output by the three encoders. This realizes triple measurement of the pitch angle and solves the problem of simultaneously providing a pitch feedback signal and a pitch indication signal to the electronic control system. The photoelectric triple pitch transmitter corresponds zero pitch to a specific digital code on the photoelectric encoder disk, thereby eliminating the zero position switch. The photoelectric uses a watertight aviation plug, replacing the conventional terminal solution, to ensure correct, convenient, and reliable wiring while also reducing the size of the pitch transmitter. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a cross-sectional view of the structure of the photoelectric triple pitch transmitter of the present invention;

[0013] In the figure, 1. rotating shaft, 2. housing, 3. rolling bearing, 4. support frame, 5. output circuit board, 6. photoelectric receiving unit, 7. code disk, 8. light source. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] like Figure 1 As shown, a photoelectric triple pitch transmitter includes a rotating shaft 1, a housing 2, a rolling bearing 3, a support frame 4, an output circuit board 5, a photoelectric receiving unit 6, a code disk 7, and a light source 8.

[0016] The support frame 4 is connected to the housing 2, and the output circuit board 5 is fastened to the support frame 4 by screws. A photoelectric receiving unit 6 is welded to the output circuit board 5 and is used to receive the light signal emitted by the light source 8 and convert it into an electrical signal. The output circuit board 5 receives the binary code or Gray code formed on the photoelectric receiving element 6 and converts it into an RS485 digital signal and an analog 4-20mA current signal. The rotating shaft 1 is connected to the housing 2 via the rolling bearing 3, allowing it to rotate freely relative to the housing 2. It is also secured to the code disk 7 via an interference fit. The three code disks 7 spaced apart on the rotating shaft 1 form the moving disk of the photoelectric encoder, while the three support frames 4, the output circuit board 5, and the photoelectric receiving unit 6 fixed to the housing 2 form the stationary disk.

[0017] The present invention is applicable to the oil distributor in the controllable pitch propeller device, and is generally installed on the pitch indicating mechanism to convert the mechanical signal of the pitch angle into an electrical signal. During installation, the photoelectric triple pitch transmitter is fixed to the pitch indicating mechanism of the oil distributor by screws, and the rotating shaft 1 is connected to the rotating part of the pitch indicating mechanism by an elastic coupling. During operation, the moving part of the pitch indicating mechanism drives the rotating shaft 1 to rotate through the elastic coupling. At this time, the code disk 6 on the rotating shaft 1 rotates together, and the light emitted by the light source 8 shines on the photoelectric receiving element 6 through the light and dark lines on the code disk 6. The photoelectric receiving element 6 converts the received light signal into a voltage signal, and converts the voltage signal into an RS485 signal and a 4-20mA electrical signal through the output circuit board 5, and transmits it to the electronic control system. The electronic control system then accurately calibrates the current signal, and finally realizes accurate indication of the pitch angle.

[0018] Two channels of the photoelectric triple pitch transmitter are used to output feedback signals and indication signals respectively, and the other channel is used as an emergency pitch indication.

Claims

1. A photoelectric triple pitch indicator, characterized in that: It includes a rotating shaft, a shell, a support frame, an output circuit board, a photoelectric receiving unit, a code disk, and a light source. Three 12-bit absolute optical encoding disks are arranged at intervals on the rotating shaft to form the moving disk of the photoelectric encoder. The static disk corresponding to the moving disk is composed of multiple support frames, output circuit boards installed on the support frames, and photoelectric receiving units. Multiple light sources are arranged in the shell corresponding to the moving disk and static disk of each group; the code disks of the three photoelectric encoders are fixed on the same rotating shaft; the photoelectric receiving unit is welded on the output circuit board and is used to receive the light signal emitted by the light source and convert the light signal into an electrical signal; the output circuit board receives the binary code or Gray code formed on the photoelectric receiving element and converts it into an RS485 digital signal and an analog 4-20mA current signal.

2. The pitch indicator according to claim 1, characterized in that: The support frame is connected to the shell, and the output circuit board is fastened to the support frame by screws.

3. The pitch indicator according to claim 1, characterized in that: One end of the rotating shaft is connected to the housing through a rolling bearing and can rotate freely relative to the housing, and the other end is fixedly connected to the moving disk through an interference fit.

4. The pitch indicator according to claim 1, characterized in that: The photoelectric triple pitch transmitter is fixed on the pitch indicating mechanism of the oil distributor through screws, and the rotating shaft is connected to the rotating part of the pitch indicating mechanism through an elastic coupling.

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