Method for directly reading mechanical metering device by utilizing optical path

A counter and direct technology, applied in the field of measurement, can solve problems such as solder joint breakage, large material consumption, and poor anti-light pollution ability, so as to save I/O port resources, reduce the number of components, and improve reliability Effect

Inactive Publication Date: 2013-06-05
HANGZHOU QUANHENG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This installation form has the following problems. The connection between the large board for welding the MCU and the small board for welding the infrared receiving tube and the transmitting tube can only be done through the soldering process between the PCBs. Such a process cannot guarantee the accuracy of the welding and will After a period of use, the solder joints are broken, and the full electronic welding process cannot be realized
Secondly, reading a set of character wheels requires 5 light-emitting tubes and 5 receiving tubes, which consumes a lot of materials
In addition, it can only be judged by the analog infrared on-off of the receiving tube, the ability to resist light pollution is poor, the ability to resist infrared tube failure in the later stage is poor, and the performance consistency of components is high.

Method used

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  • Method for directly reading mechanical metering device by utilizing optical path
  • Method for directly reading mechanical metering device by utilizing optical path
  • Method for directly reading mechanical metering device by utilizing optical path

Examples

Experimental program
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Effect test

Embodiment 1

[0046] To read the data of a gas meter that has been used, according to the working principle of the meter, each digital point on the character wheel holds an angle of 36°. According to the principle of digital coding, we have opened light-transmitting belts with different radians on the character wheel, such as figure 1 As shown, the emitting light guide sheet and the receiving light guide sheet are fixedly installed on both sides of the character wheel, as shown in figure 2 , image 3 structure shown. A reading device is composed of multiple words, such as Figure 4 As shown, multi-digit numbers can be read out. When the character wheel walks a word, the character wheel rotates 36°, and the light-transmitting belt also rotates accordingly, so that the light path between the light-emitting point and the light-receiving point will be on (coded as "1") and broken (coded as "0") The change. The single-chip microcomputer encodes according to these changes, thus recognizes t...

Embodiment 2

[0072] According to the arrangement of all the relevant character wheels in Embodiment 1, in step (4), the photosensitive device transmits the received optical signal to the A / D conversion device through the receiving amplifying circuit. The light-transmitting belt on the character wheel used in this embodiment has 3 arc channels on the character wheel, and has 32 photoelectric Gray codes with position resolution. Moreover, the luminescent tube composed of LED lights, the receiving tube composed of photosensitive devices, and the MCU control device are placed on the same circuit board.

[0073] Read through the same steps as in Example 1, and finally obtain the arrangement numbers similar to Example 1.

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PUM

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Abstract

The invention discloses a measurement method, in particular to a method for directly reading a mechanical metering device by utilizing an optical path. Light-emitting diode (LED) lamps matched with character wheels are sequentially lightened through a microprogrammed control unit (MCU) control device, each character wheel is provided with five LED lamps, light of the five LED lamps are transferred to receiving light-guiding pieces through transmitting light-guiding pieces and light transmitting belts on the character wheels, and the receiving light-guiding pieces guide light rays to a photosensor. The photosensor and the LED lamps are installed on the same circuit board, the photosensor converts optical signals received by the photosensor into electrical signals and transmits the electrical signals to an analog to digital (A / D) conversion device, and then the MCU control device judges corresponding numbers from the A / D conversion device and records corresponding identifiers. Finally, numerical values are displayed. The method for directly reading the mechanical metering device by utilizing the optical path has the advantages of being capable of enabling device cost to be reduced and improving the device stability, convenient to operate and the like, and can be widely applied to various readout instruments.

Description

technical field [0001] The invention relates to a measurement method, in particular to a method for directly reading a mechanical scale by using an optical path. Background technique [0002] As we all know, a gas meter is a device that measures the gas used by a user. Among household gas meters, a large number of gas meters are membrane gas meters. When the user uses gas, the gas pushes the film to reciprocate, and this movement is transmitted to the counter on the gas meter through the mechanical transmission device. The character wheel on the counter is printed with numbers from 0 to 9, and when the latter character wheel (such as a ones digit) rotates for a circle, it drives the previous character wheel (ten digits) to advance by one digit, and so on. The number displayed in the character wheel window is the cubic number of gas consumption used by the user. Users and gas companies conduct trade settlement according to this figure. [0003] According to the working pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F15/06
Inventor 徐勤朗黄文元
Owner HANGZHOU QUANHENG SCI & TECH
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