JP6626316B2 - Smoke point measuring device - Google Patents

Description

  The present invention relates to a smoke point measuring device, and more particularly to a smoke point measuring device for measuring a smoke point of a hydrocarbon fuel.

  The smoke point, which is one of the indices indicating the combustibility of hydrocarbon fuels such as kerosene and aviation turbine fuel oil, emits smoke when the hydrocarbon fuel is burned using a tester specified in JIS K2537. It is the maximum height of a flame that does not occur, expressed in millimeters (mm).

The outline of the procedure for measuring the smoke point specified in JIS K 2537 is as follows.
(1) A wick impregnated with a hydrocarbon fuel as a sample to be measured is inserted into a wick tube of a candle.
(2) The sample to be measured is stored in the candle in an amount of 20 milliliters (ml).
(3) Screw the wick tube into the candle.
(4) Cut the burning end of the wick at a position 6 mm from the upper end of the wick tube.
(5) Insert the candle into the lamp from below and ignite the burning end of the wick protruding from the candle.
(6) By moving the candle vertically with respect to the lamp body, the length of the wick exposed from the upper end of the wick tube guide of the lamp is adjusted so that the height of the flame becomes 10 mm, and 5 minutes. Burn the sample to be measured.
(7) After raising the candle until smoke comes out from the tip of the flame, slowly lower the candle while visually observing the change in the state of the flame.
(8) The height of the flame when the flame has a specified shape is visually read and recorded as a measured smoke point.

  However, in the conventional method, the shape of the flame and the smoke point recognized by the measurer have a large subjective part, and there are problems in the measurement accuracy such that different results are obtained between different measurers.

  The present invention has been made in order to solve such a conventional problem, and it is possible to perform both visual measurement and automatic measurement by image analysis, and accurately determine the smoke point of hydrocarbon fuel. It is an object of the present invention to provide a smoke point measuring device capable of measuring.

In order to solve the above problem, a smoke point measuring device according to the present invention includes a wick tube into which a wick impregnated with hydrocarbon fuel is inserted, and a predetermined length portion of the wick is measured from an upper end of the wick tube. A candle that protrudes and burns the hydrocarbon fuel, an elevating device that vertically elevates the candle, and a hollow wick tube guide that vertically guides the wick tube of the candle that is raised and lowered by the elevating device. A lamp body in which the candle is disposed, an ignition means for igniting the wick, and a length of the wick exposed from the upper end of the wick tube guide, which is opened at the front side of the lamp body on the observation side. An observation window for visually observing the flame of the hydrocarbon fuel whose outer shape changes according to the shape of the flame of the hydrocarbon fuel as viewed from the observation window within the lamp body. A graduation plate for visual measurement provided at a later position, a photographic window opened on a side portion of the lamp body that is separated from the observation window and the graduation plate, and a length of the wick through the photographic window. The flame of the hydrocarbon fuel whose outer shape changes according to the camera is continuously photographed, and a camera that outputs the obtained color image, and the color image is analyzed, and the hydrocarbon fuel as the sample to be measured is analyzed. An image analyzer that determines a smoke point, and an image of a flame output from the image analyzer, and a display device that displays data related to the smoke point , wherein the display device is used for the observation on the observation side. The configuration is such that it is provided at a position substantially avoiding the observation window on the same surface as the surface on which the window opens .

With this configuration, the smoke point measuring device according to the present invention can perform both visual measurement and automatic measurement by image analysis, and can accurately measure the smoke point of the hydrocarbon fuel. Further, with this configuration, the smoke point measuring device according to the present invention can perform both the visual measurement and the automatic measurement without the measurer moving greatly.

  The present invention provides a smoke point measuring device capable of performing both visual measurement and automatic measurement by image analysis and capable of accurately measuring the smoke point of hydrocarbon fuel.

It is a block diagram showing composition of a smoke point measuring device as an embodiment of the present invention. It is a sectional view showing the composition of the lamp with which the smoke point measuring device as an embodiment of the present invention is provided. It is a top block diagram showing the composition of the smoke point measuring device as an embodiment of the present invention. It is a figure for explaining the relation between the size of the photography picture generated by the camera with which the smoke point measuring device as an embodiment of the present invention is provided, and the height of the flame.

  Hereinafter, an embodiment of a smoke point measuring device according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a smoke point measuring device 1 includes a lamp body 12 in which a candle 11 is disposed, a lifting device 13, a camera 14, a display device 15, an operation device 16, and a control device functioning as an image analysis device. 17 mainly. The candle 11 and the lamp body 12 have shapes and dimensions specified in JIS K2537.

  As shown in FIG. 2, the candle 11 has a wick tube 11b into which a wick 11a impregnated with a hydrocarbon fuel is inserted. It is designed to burn hydrogen fuel.

  As shown in FIGS. 2 and 3, the lamp body 12 includes an observation window 12a, a smoke tube 12b, a scale plate 12c, a ventilation room 12d, a ventilation opening 12e, a candle holder 12f, a photographing window 12g, a wick tube guide 18, and A heater 19 is provided.

  The scale plate 12c has a zero point at the upper end position of the lamp tube guide 18 and is used for visual measurement. The scale plate 12c is provided in the lamp body 12 behind the flame of the hydrocarbon fuel when viewed from the observation window 12a. The heater 19 functions as ignition means for igniting the wick.

  The observation window 12 a is a window for visually observing the flame of the hydrocarbon fuel whose outer shape changes according to the length of the wick 11 a exposed from the upper end of the wick tube guide 18. It is open at the front of the observation side.

  The photographing window 12g is a window through which the camera 14 receives light emitted from the flame of the hydrocarbon fuel, and is opened at a side portion of the lamp body 12 that is separated from the observation window 12a and the scale plate 12c. .

  The lifting device 13 raises and lowers the candle 11 in the vertical direction. The elevating device 13 includes a control motor 13a driven by a control device 17, which will be described later, an upper and lower portion rotatably supported, a screw shaft 13b rotated by the control motor 13a, and a nut runner 13c screwed to the screw shaft 13b. And a lifting table 13d to which the nut runner 13c is fixed. The elevating device 13 is further provided with a guide post 13e for vertically guiding the elevating table 13d together with the screw shaft 13b and projecting integrally from the elevating table 13d, and places and holds the candle 11 at the projecting end. And a bracket 13f.

  Specifically, the elevating device 13 raises the candle 11 from below the candle holder 12 f before measuring the smoke point of the hydrocarbon fuel as the sample to be measured, and moves the wick 11 a of the candle 11 inside the lamp body 12. To be placed.

  When measuring the smoke point, the lifting device 13 raises and lowers the candle 11 in the lamp body 12 according to the state of the flame. As the wick 11a of the candle 11 rises, the height of the flame (hereinafter, also referred to as “flame height”) increases. After measuring the smoke point, the elevating device 13 lowers the candle 11 from inside the lamp body 12 and extracts the candle 11 from the candle holder 12f.

  The wick tube guide 18 is hollow, and is configured to vertically guide the wick tube 11b of the candle 11 that is raised and lowered by the lifting device 13.

  The camera 14 continuously shoots the flame of the hydrocarbon fuel whose outer shape changes according to the length of the wick 11a exposed from the upper end of the wick tube guide 18 through the photographic window 12g, and outputs the obtained photographic image. It is supposed to. The captured image may be a black-and-white image or a color image. The camera 14 includes an image sensor using a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS), and uses a digital camera or a digital video camera capable of outputting a captured image as digital data. Is preferred.

  The digital data output from the camera 14 includes gradation information of each pixel on the image sensor of the camera 14. The gradation information includes a gradation value of a black-and-white image or a gradation value of, for example, RGB of a color image. However, the gradation information of the color image is not limited to the RGB gradation values, but may be a data format (YUV, YCrCb, etc.) expressing other color information.

  FIG. 4 is a diagram for explaining the relationship between the size of the captured image generated by the camera 14 and the flame height. When assembling and adjusting the smoke point measuring device 1, the position of the camera 14 is adjusted by, for example, the following procedures (1) to (4).

(1) As shown in FIG. 4A, an adjustment scale 50 is installed in a state where the candle 11 is not arranged in the lamp body 12. At this time, a line indicating 0 mm of the scale 50 is made to coincide with the upper end position of the wick tube guide 18.
(2) When the 0 mm line of the scale 50 in the captured image is set to the position of 0 pixel in the vertical direction (reference position), 500 pixels in the vertical direction in the captured image are set to, for example, 50.0 mm of the height of the flame. Correspondingly (500 pixels = 50.0 mm), the position of the camera 14 is adjusted while checking the captured image as shown in FIG.
(3) When 500 pixels = 50.0 mm, one pixel corresponds to 0.1 mm. Therefore, when the number of pixels of the height of the flame in the captured image is 123 pixels, the control device 17 calculates the height of the flame as 12.3 mm.
(4) When the position adjustment of the camera 14 is completed, the scale 50 is removed.

  The control device 17 is configured by a microcomputer including, for example, a CPU, a ROM, a RAM, an HDD, and the like, and controls the operation of each of the above-described units constituting the smoke point measuring device 1. Further, by executing a predetermined program, the control device 17 analyzes a photographed image photographed by the camera 14 and determines a smoke point of the hydrocarbon fuel as the sample to be measured.

  The display device 15 is provided on the observation side and at a position avoiding the observation window 12a. The display device 15 is configured by a display device such as an LCD or a CRT, and displays various display contents according to a control signal from the control device 17. This display content includes a flame image output from the control device 17 as an image analysis device, data on a smoke point, and the like. Further, the display device 15 may display an operation target such as a soft key, a pull-down menu, or a text box for setting measurement conditions and the like.

  The display device 15 displays a menu screen for selecting whether to perform automatic measurement by the control device 17 or visual measurement using the scale plate 12c. Furthermore, when visual measurement is selected by the operation device 16, the display device 15 may display a controller for manually controlling the elevation amount of the candle 11 by the elevation device 13 by the operation device 16. Good.

  The operation device 16 includes an input device such as a keyboard, a touch panel, or a mouse. Alternatively, the operation device 16 may have a configuration in which an operation target such as a soft key, a pull-down menu, or a text box is displayed on the display device 15.

  As described above, the smoke point measuring apparatus 1 of the present embodiment can execute both the visual measurement and the automatic measurement based on the image analysis defined in JIS K 2537 as necessary, and Can be accurately measured.

  In addition, the smoke point measuring apparatus 1 of the present embodiment performs both the visual measurement and the automatic measurement without a large movement of the measurer since the display device 15 and the observation window 12a are both arranged on the observation side. Can be performed.

Reference Signs List 1 smoke point measuring device 11 candle 11a wick 11b wick tube 12 lamp body 12a observation window 12c scale plate 12g shooting window 13 elevating device 14 camera 15 display device 16 operating device 17 control device (image analysis device)
18 Light tube guide 19 Heater (ignition means)

Claims (1)

A candle having a core impregnated with a hydrocarbon fuel impregnated, a predetermined length of the core protruding from an upper end of the core tube, and a candle burning the hydrocarbon fuel;
An elevating device for vertically elevating the candle,
A lamp body having a hollow wick tube guide that vertically guides the wick tube of the candle that is raised and lowered by the lifting device, and the candle is disposed therein;
Ignition means for igniting the wick;
An observation window that is opened at the front side of the observation side in the lamp main body, and that allows visual observation of the flame of the hydrocarbon fuel whose outer shape changes according to the length of the wick exposed from the upper end of the wick tube guide,
In the lamp body, a scale plate for visual measurement provided at a position behind the flame of the hydrocarbon fuel as viewed from the observation window,
A photographing window that is opened at a side portion of the lamp body that is separated from the observation window and the scale plate,
A camera that continuously shoots the flame of the hydrocarbon fuel whose outer shape changes according to the length of the wick through the shooting window, and outputs the obtained color image,
An image analyzer that analyzes the color image and determines a smoke point of the hydrocarbon fuel as the sample to be measured,
An image of the flame output from the image analyzer, and a display device that displays data related to the smoke point ,
The smoke point measuring device , wherein the display device is provided at a position substantially avoiding the observation window on a surface substantially the same as a surface on which the observation window on the observation side is opened .

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