Rail deflection control device

FIELD: transport.

SUBSTANCE: invention relates to metrology and can be used for automated control of the rail deflection, for example, in straightening the rail prior to welding the seamless rails. The device incorporates a measuring platform accommodating three optical pickups to keep its front and rear ends and centre, and a measuring device connected to the said pickups. The device comprises also the strips optically contrast relative to the rail surface, arranged on the platform beneath the rail, and a mechanism shifting the rail relative to the immovable measuring platform. The optical pickups are shadow column instruments to record the rail shadow projection against the background of the contrast strip.

EFFECT: possibility of measuring vertical and horizontal rail deflection in straightening.

6 cl, 3 dwg

 

The invention relates to the field of measurement technology and can be used for automated control of the deflection of the rail, for example, when the alignment before welding seamless rails.

Currently, due to increased speed of rail transport, it is important to use long seamless rail lashes. Therefore, when welding of rail lashes sharply raises the issue of providing values of vertical and horizontal deflection of the rail on the base length. Objective technical control of these parameters allows you to accelerate the Assembly of seamless rail lashes, to reduce the cost of their manufacture and to simplify the Assembly technology of the track of the rail lashes.

A device for measuring the geometrical parameters of the rail (see U.S. patent No. 4288855, CL G01B 7/28, 1981), including mounted on the base platform of the contact sensors measuring the amount of vertical and horizontal deflection of the rail at a predetermined length, and the height of the rail head and the width of its surface.

The main disadvantage of the known device is not sufficiently high measurement accuracy associated with the use of mechanical contact sensors under the control of the newly collected rail lashes. This is because the rail at the stage of the post the key can have external contamination or local corrosion delamination of the metal, which will be perceived by mechanical sensors.

In addition, the known device has a small performance needed to establish reliable contact with the surface, which complicates its use in automatic complexes Assembly rail lashes.

Closest to the claimed device technical essence is a device for controlling the track, taken as a prototype (see U.S. patent No. 4040738, CL G01C 3/00, 1977), including installation on the base platform of the three optical sensors controlling the rail at the beginning, center and end, as well as the measuring device is connected to the sensors. The device allows to measure the magnitude of the vertical and horizontal deflection of the rail at a given length.

The main disadvantage of the known device is that the measurement of the parameters of the rail is produced on the reflected component of the incident radiation. On an operating section of rail track surface of the rail is a mirror surface, which is well reflected by the mirror component of the incident radiation. The rails, which were not in operation, have a low reflectivity, and therefore, the known device will be practically unusable.

In addition, the known device measures the parameters of the rail by p is moving on a special platform and makes measurements relative to the existing rail track, which was previously exhibited as horizontally and vertically. When the control rail passing alignment, there are no technological base against which you can measure its basic parameters, i.e. without installing rails on control plot ways to measure its parameters by means of the known device is not possible.

The aim of the present invention is to remedy these disadvantages, namely the measurement of the vertical and horizontal deflection of the rail in the process of straightening.

The objective in the device for controlling the deflection of the rail, comprising a base platform, which is equipped with three optical sensors that control the rail at the beginning, center and end, as well as the measuring device is connected to the sensors is achieved in that the device additionally introduced optical contrast relative to the surface of the rail strip mounted on the measuring platform under the rail, and the mechanism of movement of the rail relative to the stationary measuring platform, the optical sensors are used shadow sensors to register the shadow projection of the rail on a background of contrasting stripes.

Specified, the device allows three shadow images of rail coming after straightening, to determine its trough in ismere the second plane.

To ensure movement of the rail relative to the stationary measurement platform used mechanism made in the form of a roller conveyor, the rollers of which has contrasting stripes.

It is advisable as a contrasting stripe to use either illuminated from the bottom frosted glass or reflective strip, illuminated from above with a diffused light source such as fluorescent lamp.

To improve the accuracy of the measurement as a shadow receiver sensor used linear photodiode matrix or linear CCD matrix (matrix-based devices with the charging current link).

The proposed device for measuring the deflection of the rail due to the shadow of optical sensors, allows you to use as a measuring platform directly to the base of the press for straightening rails, aligning the measurement area, with the area of the straightening of the rail, which is unique among the known devices used to control the geometric parameters of rails before welding in long lashes, and therefore meets the criterion of "inventive step".

Figure 1 shows a drawing explaining the principle of operation of the claimed device.

Figure 2 presents plots of the electric output signal of the optical shadow sensor, spaced from zero is tetki at distances L 1and L2.

Figure 3 presents the block diagram of the measuring device.

Figure 1 shows a rail 1 is mounted on the rollers of the conveyor 2; contrasting stripe 3; optical shadow sensor 4 (D1, D2, D3), mounted on a support beam 5 and having the angle 6.

Figure 3 shows the block diagram of the microprocessor of the measuring device 7, which includes a microprocessor 8; random access memory (RAM) 9; a persistent storage device (ROM) 10; expander I / o (RVV) 11; information bus 12; a signal Converter sensors 13, keyboard 14, a display device 15.

The device operates as follows. On the roller conveyor 2 is placed in the measurement area of the reference preparation (flat slat) with zero deviation and register the obtained shadow image sensor 4 (D1, D2, D3) as a benchmark, which is stored in the ROM 10. After this roller conveyor 2 move the rail 1 through the zone of measurement sensors 4. Operator indicator device 15 determines the section of the rail with the greatest curvature in the horizontal plane and stops the movement mechanism 2. After a stop rail sensors D1-D3 to more accurately measure the position coordinates of the edge rail X1-X3 relative to the given basis for comparison (see figure 2), respectively, at the beginning, middle and end zones of control.

p> In the measuring device 7 according to the measurement results X1-X3 each sensor calculates the amount of arrow deflection Δ as:

In case of exceeding the magnitude of arrow deflection valid values rails straightened and again measured the arrow deflection. The process is repeated for the entire length of the rail to obtain acceptable values of arrow deflection. For control of arrow deflection in the vertical plane of the rail chantuese and the procedure is repeated.

The measured geometric parameters of the rail are displayed on the display device 15 (monitor or plotter).

As the shadow of sensors used coordinate-sensitive projection sensors. The sensor is based on the projection of a shadow image of the rail on the background of the reflective surface on the photodiode line (or linear CCD matrix) with the subsequent registration of the signal line using an analog-to-digital Converter and the data analysis of microprocessor-based measuring device. As a contrast stripe was used or illuminated from the bottom frosted glass or reflective strip, illuminated from above by a light source. As the reflective strip has been used, for example, adhesive tape, used for pasting shared is public transport to prevent collisions in the dark.

The average accuracy of the measurement of the deflection of the rail of 0.5 mm, which satisfies the required conditions in the Assembly rail lashes.

Thus, the proposed device allows to reliably control the amount of vertical and horizontal deflection of the rail at a given length.

1. Device for controlling the deflection of the rail, comprising a sensor platform, which is equipped with three optical sensors that control the rail at the beginning, center and end, as well as the measuring device is connected to the sensors, characterized in that it contains optical contrast relative to the surface of the rail strip mounted on the measuring platform under the rail, and the mechanism of movement of the rail relative to the stationary measuring platform, the optical sensors are used shadow sensors to register the shadow projection of the rail on a background of contrasting stripes.

2. The device according to claim 1, characterized in that the mechanism of movement of the rail relative to the stationary measuring platform is designed in the form of a roller conveyor, the rollers of which has contrasting stripes.

3. The device according to claim 1, characterized in that as a contrasting stripe is used illuminated from the bottom frosted glass.

4. The device according to claim 1, characterized in that kachestvennosti strip is used reflective stripe illuminated from above by a light source.

5. The device according to claim 1, characterized in that as the receiver of the shadow sensor used linear photodiode matrix.

6. The device according to claim 1, characterized in that as the receiver of the shadow sensor used linear CCD array.



 

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