CN109975824A - It is a kind of for wearing the contactless platform boundary laser ranging method of track - Google Patents

Abstract

The invention relates to a laser distance measuring method for measuring the boundary of a track platform after wear, belonging to the technical field of measurement, and is mainly measured by a laser distance meter. It is possible to accurately measure the distance to the limit of the track platform that has been worn out in actual operation. This method not only enables personnel and equipment to complete the measurement without leaving the track, but also takes into account the difference between the actual wear track and the theoretical track, which is more accurate and can be applied in practice.

Description

A Non-contact Laser Ranging Method of Platform Limits for Wear Tracks

technical field

The invention relates to a laser distance measuring method for measuring the boundary of a track platform after wear, belonging to the technical field of measurement, and the measurement is mainly performed by a laser distance meter. It is possible to accurately measure the distance to the limit of the track platform that has been worn out in actual operation. Accurate control of the distance of the platform boundary is a necessary guarantee for the safe passage of vehicles, and the platform building boundary is an important part of the railway building boundary.

Background technique

At present, most of the platform limit measurement methods are divided into two types: the first one is manual contact measurement. The main measurement tools are the platform limit measuring ruler and the digital display measuring instrument. The disadvantage of this method is that the surveyors must go down the road to perform the operation, and multiple people need to go down the train at the same time to measure the track. The measurement must be completed at the time of the railway maintenance sunroof operation, and it needs to be reported one week in advance, and the limited maintenance sunroof operation time is difficult. Satisfy the work of the operator to complete the regular measurement of the platform limit on time. The platform building boundary data needs to be updated in a timely manner. If it cannot be updated regularly, it will cause a great safety hazard to traffic safety. The current measurement method is labor-intensive, low in efficiency and large in error, which is basically composed of human error and measurement error of the measurement personnel.

The second is to use simple launching instruments to conduct simple tests and calculations. Although the tedious and partial errors caused by manual operations are avoided, due to its rough calculation method and ignoring the actual operation and wear of the track Compared with the error of manual measurement, it is not far behind.

In order to solve the problems encountered in the above-mentioned measurement process, a set of "laser ranging method for measuring the limit distance of rail platform after wear" has been developed. This method not only enables personnel and equipment to complete the measurement without leaving the track, but also takes into account the difference between the actual wear track and the theoretical track, which is more accurate and can be applied in practice.

SUMMARY OF THE INVENTION

At present, one of the measurement methods for the limits of the platform building is the contact type. The measurement personnel must go down the road to complete the work within a limited time, and the work efficiency is low. This measurement method directly affects the driving safety. Another method is to use simple measuring instruments and rough calculation methods to measure theoretical orbits. The data obtained are not only inaccurate, but also difficult to use in practice. In order to solve this problem, the present invention proposes a laser ranging method for measuring the limit distance of the rail platform after wear. The advantage of this new method is that by using a laser rangefinder to implement laser non-contact distance measurement, equipment and testers work on the platform, remotely control the laser rangefinder for laser emission and signal reception, and then use Precise algorithm, accurate calculation of the limit data, and then through the comparison of the new track and the old track, to study the characteristics of the worn track, and then obtain a more accurate platform limit distance under the actual wear condition. Equipment and measurement personnel are in a safe area, which also eliminates the safety hazard brought to train operation due to personnel testing. This method saves time and effort and is actually accurate. The advantages of the non-contact laser ranging method for measuring the boundary of the track platform after wear of the present invention are very obvious:

1. Using this non-contact method, the tester does not need to complete the test within the specified range and within the specified time, as long as the test can be completed during the interval between trains. Time is free and sufficient. For multi-station and multi-track surveying operations, the surveyor only needs to go out once to complete it. Work efficiency is improved, and it can be completed on time even in emergencies;

2. Using the wear track-based algorithm for measurement can minimize human error and measurement error. When measuring, it is not necessary to find the vertical point with a square ruler, but the laser ranging method can be used for multiple measurements to greatly reduce the error, and When measuring the station, it can rotate in a certain range, which is convenient and accurate to operate.

3. In the process of measuring the data of each operating track and collecting information, it was found that there will be an irregular height difference between the two-day tracks of the worn track, that is, the horizontal distance between the left and right tracks has a height difference. Redesigning an accurate algorithm is the best algorithm that can be applied to actual measurements.

Description of drawings

Fig. 1 is the laser emission trajectory Fig. 1.

Fig. 2 is the calculation principle diagram 1.

Figure 3 is a diagram of laser emission.

Fig. 4 is the calculation principle diagram 2.

FIG. 5 is the laser emission trajectory FIG. 2 .

Fig. 6 is the calculation principle Fig. 3.

FIG. 7 is the laser emission trajectory FIG. 3 .

FIG. 8 is the calculation principle diagram 4 .

FIG. 9 is a schematic diagram of horizontal distance.

Figure 10 is a schematic diagram of vertical distance.

specific plan

The measurement steps are as follows:

1. Place the measuring tool. Place the laser rangefinder outside the platform safety line (about 1 meter from the edge of the platform);

2. Determine the vertical direction. Turn on the laser range finder to enter the measurement state, first aim at a point on the side of the rail that is farther from the platform , after measuring the data, then offset a certain angle to align the point on the other side , measured again to obtain the data (Figure 1).

3. Measure the horizontal distance. Adjust the angle of the laser ranging device and the horizontal direction , the triangle formed by (2) two laser beams and the rail (Fig. 2), calculated by programming (which is ), and use programming to import the calculation formula:

by using programming , which is the horizontal distance . retune

Adjust the angle between the laser ranging device and the horizontal direction, respectively emit two beams aimed at the reference point on the edge of the platform in the same direction (Fig. 3), and obtain a triangle (Fig. 4). The program can calculate the distance from the platform limit to the laser emission point. distance (which is ), using programming calculation to derive the formula:

Calculated by programming , get the horizontal distance , using programming calculation , the value of the horizontal distance L is obtained. (Figure 7) (Note: is the width of the rail head, which is a fixed value. )

4. Measure the height. Adjust the angle of the laser ranging device and the horizontal direction , using the laser ranging device to emit a beam to align the top surface of the track at the far end of the platform (Figure 5), as shown in 3, a triangle can be drawn (Figure 6), since the angle between the two laser beams is A known , calculate the straight-line distance from the top of the rail to the double laser emission point ,which is( ), using programming calculation to derive the formula:

Wire The angle with the horizontal direction is , which can be calculated by programming ,get value, continue to adjust the angle between the dual laser ranging device and the horizontal direction The emitted beam is aimed at the reference point on the edge of the platform in the same direction (Fig. 3), a triangle can be obtained (Fig. 4), and the distance from the platform limit to the double laser emission point can be calculated by the program , which is( ), using programming to derive the formula:

Wire The angle with the horizontal direction is , which can be calculated by programming ,inferred .

5. Calculate the height and vertical data of the track near the platform. Then use the laser ranging device to send out a beam to align the top surface of the track near the end of the platform (Figure 7). According to the above method, a triangle can be obtained (Figure 8), and the distance from the platform limit to the laser emission point can be calculated by the program. (which is ), using programming calculation to derive the formula:

by using programming , which is the horizontal distance . It can be deduced from the formula, .

6. Obtain the actual height and distance. shown by (Figure 9). Use programmatic calculations to derive the formula:

, .

Claims (4)

1. The present invention is a non-contact laser ranging method for measuring the limit of the track platform after wear. This measurement method adopts non-contact laser measurement. The equipment and testers work on the platform, and the laser is emitted from a long distance and the signal is received. , Accurately calculate the limit data, that is, to ensure the safety of the staff, without affecting the safety of the running of the rolling stock. 2. The non-contact laser ranging method for building boundary of a platform according to claim 1, the tester needs to place instruments and equipment on the safety line of the platform to know the distance from the safety line to the boundary, which is convenient for calculation. 3. The non-contact platform limit laser ranging method according to claim 1, the tester can emit laser light at any angle from the laser emission point within a certain angle range, and hit the laser light emitted each time to the target rail. 4. The non-contact laser ranging method for building boundary of a platform according to claim 1, in the testing process, the angle between the two lasers should always remain unchanged.