Device for controlling the linear dimensions

 

(57) Abstract:

Usage: in the control and measuring equipment and, more specifically can be used in machine building, ferrous and nonferrous metallurgy in the production of rent, rubber and chemical industry in the manufacture of tubular products without stopping the process and napravlenie to increase the measurement accuracy. The inventive device includes a laser 1, installed in series along the radiation system of plane mirrors 2 and 3, the scanner unit made in the form of a collimating lens 4 and multifaceted mirror prism 5, is installed rotatably around its axis of symmetry, the receiving lens 7, photoresistive device 8, the signal processing system, a control diaphragm 6, is installed in the measurement area, and is made from a material with a low coefficient of thermal expansion, which allows to obtain two reference time interval, one of which compensates for the nonlinearity of the angular velocity of rotation polyhedral mirror prism, and the other locates the details in the measurement zone. This gives the possibility to compensate for nonlinear skazanie made co-registration 11, and provided with a correction device 10, consisting of a controller 12 and a permanent mass storage device 13. 3 Il.

The invention relates to measuring technique and can be used in machine building, ferrous and nonferrous metallurgy in the production of rent, rubber and chemical industry in the manufacture of tubular products without stopping the process.

The closest in technical essence to the proposed and adopted for the prototype is a device for controlling the linear dimensions, containing the laser and installed in series along the radiation system of flat mirrors, the scanner unit made in the form of a collimating lens and correct the multifaceted mirror prism mounted for rotation around its axis of symmetry, the receiving unit consisting of a focusing lens, a photodetector and a signal-processing system [1].

The disadvantage of this device is the large control error of the linear dimensions, due to the nonlinearity of the angular velocity of rotation polyhedral mirror prism around its axis. The disadvantages include the problem of compensation for nonlinear, and the production, Assembly and alignment of such a lens are of considerable complexity, which repeatedly increase with range of controlled items.

The objective of the invention is to increase the measurement accuracy by reducing the influence of the nonlinearity of the angular velocity of rotation polyhedral mirror prism and compensation of nonlinear distortions introduced by the lens.

It is solved as follows.

In the device, a measurement after the collimating lens installed additional supporting aperture made of a material with a low coefficient of thermal expansion, such as Invar. Produces two reference intervals of passing the beam through the measurement area, one of which allows you to compensate for the nonlinearity of the angular velocity of rotation polyhedral mirror prism, and the second allows you to locate items in the measurement zone, which makes it possible to compensate for nonlinear distortion introduced by the collimating lens. The signal processing system is further provided with a correction device, which on the basis of the obtained time intervals introduce relevant amendments in the final results of the IG. 2 and 3 are timing diagrams illustrating the operation of the correction.

The device includes a radiation source (laser) 1, installed in series along the radiation system of plane mirrors 2 and 3, and the mirror 3 orientate so that it does not give shade in the measurement zone, the output collimating lens 4, a scanner unit, consisting of a collimating lens 4 and multifaceted mirror prism 5, is installed rotatably around its axis of symmetry, the aperture 6, is installed in the measurement area, the receiving lens 7, photoresistors system 8, the output of which is connected to the signal processing system, including the unit of measurement of time intervals 9, the correction device 10 and the recording unit 11. The correction device includes a controller 12 and a persistent storage device (ROM) 13. Output photoresistive system 8 is connected to the input unit of measurement of time intervals 9, the output of which is connected with the input of the controller 12 and the input of the ROM 13 of the correction device 10. The output of the controller 12 is connected to the input of the recording unit of the measurement results 11. Controlled item 14 is placed in the measurement area between the base of the aperture 6 and the receiving lens 7.

Cover with in accordance with the position of the latter parallel to the optical axis of the device AA' with a slight offset from it, for example 2 mm, and through the lens 4 is routed next to the reflecting face of the rotating multifaceted prism 5. Reflected from the latter, the light beam passes back through the lens 4. The movement of the beam for the lens 4 due to the rotation of the polyhedral prism 5, leads to its intersection with controlled part 14 placed in the measurement area between the diaphragm 6 and the receiving lens 7. The receiving lens 7 focuses the light flux on photoresistors system 8. The signal from photoresistive system 8 to the input of the unit of measurement of time intervals 9 and thence into the correction device 10. The diaphragm 6 allows you to obtain the reference time interval of passage of the light flux through the measurement area. In Fig. 2 shows a timing diagram of the passage of the light flux through the measurement area. Period of time (t1-t4) corresponds to the reference time interval, the value of which is stored in ROM device correction. The time t1corresponds to the upper border of the aperture, the moments of time t2and t3correspond to the dimensions of the part, the time t4corresponds to the "lower" boundary of the aperture. When changing the angular speed of rotation mn(t1-t4and the time of the interruption of the light flux corresponding to the dimensions of the controlled part (t2-t3). Data on the time intervals (t1and (t2- with photoresistive system 8 enter the unit of measurement of time intervals 9. With the unit of measurement of time intervals 9 data in the controller 12 and the ROM 13 of the correction device 10. Based on the data ROM 13 determines the magnitude of the corrections that must be made, the results of measurements of the linear dimensions of the controlled items. Data on the magnitude of the amendments coming into the controller 12, and the measurement results are displayed in the recording unit 11. Actually none of the lens may not provide a linear movement of the beam in the measurement area. The dependence of the speed of displacement of the beam on the angle of rotation polyhedral mirror prism is described by the expression:

< / BR>
where

- the angular velocity of the rotating multifaceted mirror prism;

- the angle of rotation polyhedral mirror prism;

f' is the focal length of the lens.

It follows that the speed of movement of the beam in the measurement zone at a constant angular velocity of rotation of the prism nonlinear changes depending on the angle that bring. is a of Fig. 3 shows a graph of the velocity distribution of the beam moving in the measurement area, and a time chart that explains the process of compensating nonlinear distortion of the collimating lens. Period of time (t1-t2allows you to define the location of the "upper" boundary of the part and the time period (t1-t3) the location of the lower boundary of the part. Data on the time intervals (t1-t2) and (t1-t3with photoresistive system 8 enter the unit of measurement of time intervals 9. The unit of measurement of time intervals 9 are formed signals characterizing a location controlled items in the measurement zone, and is transmitted to the input of the controller 12 and the ROM 13. In the controller 12 with the account stored in the ROM 13 of the information on the pre-calibration zone dimensions and location controlled items 14 in the measurement zone are determined by the magnitude of the corrections that must be made in the measurement results displayed in the recording unit 11. This increases the accuracy of determination of the linear dimensions of the part.

The proposed device can significantly improve the accuracy of measurements of the linear dimensions of the parts without making the design ptx2">

Device for controlling the linear dimensions, containing the laser and installed in the course of its radiation system flat mirrors, the scanner unit made in the form of a collimating lens and a proper polyhedral prism mounted for rotation around its axis of symmetry, the receiving lens, photoresistive device, signal processing system, characterized in that a measurement after the collimating lens set reference aperture for receiving the two reference intervals of passing the beam made of a material with a low coefficient of thermal expansion, and a signal processing system additionally introduced the device of correcting the nonlinearity of the angular velocity of rotation of the polyhedral prism and nonlinear distortion, made collimating lens.

 

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