JPS6242324Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of an optical measuring device that automatically measures the diameter of round steel bars, steel pipes, etc. in a hot or cold manner without contact during the manufacturing process. It is.

This type of measuring device needs to perform measurements at necessary points for quality control on the process line, so it may be necessary to measure while the object being measured is heated, or the measured value may be transferred to the next step. This must be reflected in the control specifications of the process, so in order to shorten the measurement time, it may be necessary to rotate the measured object and measuring device relative to each other while automatically feeding the measuring device. Optical systems can be exposed to the dynamic and harsh atmospheric conditions in which they are placed.

If the object to be measured is, for example, a red-hot round steel bar obtained by hot rolling, if the high-temperature annular air layer surrounding the object stagnates, haze will occur and cause the photometric beam to fluctuate, causing the measured value to change. Errors may occur, water vapor, saturated water, or oil droplets may adhere to the entrance glass plate or lens of the optical system, clouding it, or scale and other deposits on the object to be measured may scatter and cause damage to the lens. In addition, the lens can become dirty due to dust, water and oil droplets that are already present in the air. On the other hand, the optical system mechanism and the measuring instruments connected to it are, for example, CCDs (Charge Coupled
Device) Image sensor only in the end area of the dimension
Since it has a high degree of precision as 100 units are installed in parallel, contamination of the lenses, etc. is important in the sense of eliminating factors that reduce sensitivity and distort images and maintain detection performance in good condition. must be avoided as much as possible.

In response to the above requirements, this invention was developed to create an optical dimension measuring device that prevents fluctuations in the photometric beam caused by the environment of the object to be measured, contamination of the measuring optical system mechanism, and the resulting decrease in sensitivity and accuracy of measured values. The system includes a first optical system that irradiates the object to be measured with parallel rays of light, a second optical system that obtains an image of the object based on the parallel rays irradiated to the object, and A detector for measuring the dimensions of an image of the object to be measured, the first optical system, the second optical system, and the detector are arranged relative to each other with the object to be measured interposed therebetween, and these are arranged in the feeding direction of the object to be measured. On the other hand, in an optical dimension measuring device comprising a rotating mount that rotates and holds in a vertical plane,
Two air injection tubes are provided to form a cylindrical injection air layer between the object to be measured and the optical system mechanism. This optical dimension measuring device is characterized in that an air filtration device is used to remove dust, water, oil droplets, etc. contained therein, and its injection nozzle is arranged close to the optical system mechanism. .

Next, an example will be explained with reference to the drawings. Figure 1 is a side sectional view of the main part of the optical dimension measuring device of this invention, Figure 2
The figure is a sectional view taken along the - line in FIG. 1. In the figure, reference numeral 1 indicates an object to be measured, in this case a round steel bar, which is sequentially fed in the direction of the arrow. Reference numeral 2 denotes a first optical system mechanism, which is provided with a light source 3 and a collimator lens 4 inside, and emits parallel light beams in the direction of the arrow in the figure to illuminate the object 1 to be measured. 5 is a second optical system mechanism, inside which is a condenser lens 6 and a CCD (Charge Coupled
Device) A detector group 7 consisting of an image sensor is provided. The second optical system mechanism is adapted to measure the diameter dimension of the image of the object to be measured. In the case of this embodiment, the first and second optical system mechanisms are configured to rotate around the object to be measured 1 by means of the rotating mount 8, and as the object to be measured is fed, the first and second optical system mechanisms rotate in a spiral manner. The diameter of the object to be measured is scanned and measured. Rotation of the rotating frame 8 is effected by its sprocket wheel 9 chain 10 and motor 11. Further, in the figure, 12 indicates a ball bearing, and 13 indicates a slip ring. Furthermore, numeral 14 in the figure is a cooling jacket through which cooling water flows. Next, 15 and 16 are the objects to be measured,
This is an injection tube that creates a double injection air layer (air curtain) across the space in the space between both optical system mechanisms. It has nozzles 15' and 16' at its tip. In this embodiment, as described above, since the measurement method is of the rotational scanning type, each injection pipe has a cylindrical shape. Air blowing pumps 17 and 18 are inserted into each of the injection pipes 15 and 16, respectively, and in this case, an air filtration device 19 is further inserted into the outer injection pipe 16.

The air filtration device 19 may include an air dryer or a dust filter such as glass fiber mat depending on the measurement environment conditions of the object to be measured. Therefore, the degree of equipment can be differentiated.

This injected air layer thereby blows away the high-temperature air layer that stagnates in the vicinity of the object to be measured and the optical system mechanism, especially when the object to be measured is in a red-hot state, and also blocks the exchange of air between the two. death,
Prevents dust, scale, water and oil droplets from scattering onto the optical system mechanism. However, if only one layer of injected air is provided, in order to obtain a sufficient air exchange blocking effect, it is necessary to increase the capacity of the blower pump, the blower speed, and heavy equipment such as air filtration equipment, which lacks equipment economy. However, in this design, the injection air layer is a double layer, and the air filtration device is installed only in the injection pipe of the layer on the side of the optical system mechanism, thereby improving the air exchange blocking effect economically. It is something. If the above-mentioned high-temperature air layer stagnates near the object to be measured in the inner injection air layer close to the object to be measured, this air layer will absorb dust, scale, water, and oil droplets emitted from the object to be measured. In addition, the introduced dust, water, oil droplets, etc. that are contained in the jetted air layer itself and tend to diffuse to the outside are blown away and their transfer to the optical mechanism side is blocked. The transition to the optical system is now blocked by the blast air layer close to the outer optical system. Since this outer injection air layer is provided with an air filtration device 19 within its injection tube 16, almost no dust, water, or oil droplets diffuse from the air layer itself toward the optical system mechanism.

In this embodiment, since a rotating optical size measuring device is used, the injection tubes 15 and 16 are cylindrical, and the injection air layer formed thereby is also cylindrical. However, in the case of a stationary type, The injected air layer may be planar.

Since this device is constructed as described above, in this optical dimension measuring device, when the object to be measured is, for example, a red-hot round steel bar obtained by hot rolling, a high-temperature annular air layer surrounding the object is used. Measures by blowing away dust and scale emitted from the object to be measured by the inner layer of the double injection air layer, and suppressing fluctuations that occur in the photometric beam due to heat haze caused by stagnation of the high-temperature air layer. It is possible to prevent errors from entering into the values, and the outer jet of purified air through the air filtration device diffuses the air contained in the inner jet air layer itself to the outside, and the optical system It is possible to prevent dust, water, oil droplets, etc. from migrating to the optical system mechanism, which could contaminate the mechanism. Further, by arranging the nozzle of the air injection tube close to the optical system mechanism, the above-mentioned cutting can be performed completely. In this way, according to the present invention, the optical system mechanism can always be operated in good condition, and the reduction in sensitivity and accuracy of measured values caused by the environment of the object to be measured can be avoided economically and extremely efficiently. This has the useful effect of simplifying equipment that can prevent such problems.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of a main part of the optical dimension measuring device of this invention, and FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1...Object to be measured, 2...First optical system mechanism, 5
...Second optical system mechanism, 7...Detector group, 8...
Rotating stand, 15...Air injection tube that creates an injection air layer on the side closer to the measurement object, 16...Air injection tube that creates an injection air layer on the side closer to the optical system mechanism, 17, 18
...Blower pump, 19...Air filtration device.

Claims (1)

[Scope of utility model claims] A first optical system that irradiates the object to be measured with parallel rays of light, a second optical system that obtains an image of the object based on the parallel rays irradiated to the object to be measured, and a second optical system that measures the dimensions of the image of the object to be measured. The first optical system, the second optical system, and the detector are arranged relative to each other with the object to be measured interposed therebetween, and these are rotated and held in a plane perpendicular to the feeding direction of the object to be measured. In an optical dimension measuring device equipped with a rotating stand, a double air jet tube is provided to form a cylindrical jet air layer between the object to be measured and the optical system mechanism, and a The air injection pipe is provided with an air filtration device that removes dust, water, oil droplets, etc. contained in the introduced air inside the injection pipe, and the injection nozzle is arranged close to the optical system mechanism. An optical measuring device characterized by: