CN112432617A

CN112432617A - Steel rail non-contact laser measuring platform

Info

Publication number: CN112432617A
Application number: CN202011351339.8A
Authority: CN
Inventors: 于明; 陈城; 刘立; 陈景光; 牛加飞; 庄树明; 车立志; 于洪星; 王大雷; 张立军; 梁宏波; 赵宁宁; 荆莹; 齐昆; 王宇鹏
Original assignee: Tieke Beijing Track Equipment Technology Co ltd; Sinotest Equipment Co ltd
Current assignee: Tieke Beijing Track Equipment Technology Co ltd; Sinotest Equipment Co ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-03-02

Abstract

The invention relates to a non-contact laser measuring platform for a steel rail, belonging to a measuring platform for a steel rail. The linear guide rail of moving mechanism fixed connection is on the base upper surface, and bracket fixed connection is on the base upper surface, and is located moving mechanism's linear guide's inside, and host computer frame and moving mechanism's linear guide sliding connection, measuring mechanism fixed connection is in host computer frame's inside. The advantage is novel structure, and it is big to adopt servo motor drive rack transmission bearing capacity, and the transmission precision is higher, can reach 0.1mm, but unlimited length butt joint continuation, and transmission speed can be very high, >2m/s, combines plc controller and PC end, absolute encoder can realize automatic detection and accurate positioning and speed governing to longer rail, reduces human error to easy equipment integration.

Description

Steel rail non-contact laser measuring platform

Technical Field

The invention belongs to a measuring platform of a steel rail, and particularly relates to a non-contact laser measuring platform of the steel rail.

Background

The flatness is one of the quality indexes of the product of the train rail leaving the factory in the production process, and the traditional detection mode mainly adopts manual work or manual work participation detection. When in measurement, the running rule is used for combining the feeler gauge for measurement when the running rule is pressed on the bottom surface of the steel rail, and the problems that the operation is inconvenient and the whole measurement surface condition cannot be reflected in the measurement process are solved. In addition, the measuring scale is easy to generate external factors such as deformation and unbalanced pressure during measurement due to inconvenient operation and placement during measurement, so that the measured value is easy to distort.

Two to conveyer belt transport formula rail straightness measuring device includes benchmark sliding guide, a slide, laser displacement sensor, vertical walking encoder and computer signal processing device, the slide is arranged in and is surveyed on the relative parallel benchmark sliding guide of rail, put the laser displacement sensor who measures rail top surface straightness accuracy in the middle of the slide upper portion, with survey at least one side in the parallel slide both sides of rail and put the laser displacement sensor who measures rail side straightness accuracy, laser displacement sensor is as the cooperation of the vertical walking encoder that detecting element and driving pulley coaxial were equipped with, carry out point-by-point scanning to the top surface and two sides of rail, data acquisition, through the straightness of calculation processing output rail.

Traditional measuring platform application conveyer belt mode transportation sensor measures, and for gear transportation, the bearing capacity is less, and displacement control precision is lower relatively. The belt transmission length can not be too long, otherwise, larger elastic deformation and vibration need to be considered, the transmission distance is large, and the belt transmission length is particularly not suitable for accurate positioning and continuous motion control and is difficult to be suitable for large-scale long-distance numerical control equipment, such as XY axes of large-layout numerical control equipment. Therefore, the method is only suitable for small numerical control equipment.

Disclosure of Invention

The invention provides a steel rail non-contact laser measuring platform, which aims to solve the problems that the traditional measuring platform cannot be too large in transmission length, is not suitable for accurate positioning and continuous motion control.

The technical scheme adopted by the invention is as follows: the device comprises a host frame, a base, a bracket, a measuring mechanism and a moving mechanism, wherein a linear guide rail of the moving mechanism is fixedly connected to the upper surface of the base, the bracket is fixedly connected to the upper surface of the base and positioned inside the linear guide rail of the moving mechanism, the host frame is connected with the linear guide rail of the moving mechanism in a sliding manner, and the measuring mechanism is fixedly connected inside the host frame.

The measuring mechanism comprises a first line laser sensor, a second line laser sensor and a third line laser sensor, wherein the first line laser sensor is fixedly connected below the top of the main frame, and the second line laser sensor and the third line laser sensor are oppositely arranged on the upper part of the side face of the main frame.

The moving mechanism comprises a servo motor, a speed reducer, a rack, a gear, a linear guide rail, a drag chain and a drag chain frame, wherein the rack is fixedly connected to the base and located on the outer side of the linear guide rail, the speed reducer is fixedly connected with the outer side of the lower portion of the host frame, an output shaft of the servo motor is connected with the speed reducer, the speed reducer is connected with the gear, the gear is meshed with the rack, one end of the drag chain is connected with a base of the speed reducer, one end of the drag chain is connected with the drag chain frame, and the drag chain frame is fixedly connected with.

The invention has the advantages of novel structure, large transmission bearing capacity of the rack driven by the servo motor, high transmission precision which can reach 0.1mm, infinite length butt joint and continuation, high transmission speed which is more than 2m/s, capability of realizing automatic detection, accurate positioning and speed regulation of a longer steel rail by combining a plc controller, a PC end and an absolute encoder, reduction of human errors and easiness in equipment integration.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a view in the direction A of FIG. 1;

fig. 3 is a schematic structural view of the moving mechanism of the present invention.

Detailed Description

Including host computer frame 1, base 2, bracket 3, measuring mechanism 4 and moving mechanism 5, wherein moving mechanism 5's linear guide 505 fixed connection is on base 2 upper surface, bracket 3 fixed connection is on base 2 upper surface, and is located moving mechanism 5's linear guide 505 inside, host computer frame 1 and moving mechanism 5's linear guide 505 sliding connection, measuring mechanism 4 fixed connection is in host computer frame 1's inside.

The measuring mechanism 4 comprises a first line laser sensor 401, a second line laser sensor 402 and a third line laser sensor 403, wherein the first line laser sensor 401 is fixedly connected below the top of the main frame 1, and the second line laser sensor 402 and the third line laser sensor 403 are oppositely arranged on the upper part of the side surface of the main frame 1.

The moving mechanism 5 comprises a servo motor 501, a speed reducer 502, a rack 503, a gear 504, a linear guide rail 505, a drag chain 506 and a drag chain frame 507, wherein the rack 503 is fixedly connected to the base 2 and located on the outer side of the linear guide rail 505, the speed reducer 502 is fixedly connected with the outer side of the lower portion of the main frame 1, an output shaft of the servo motor 501 is connected with the speed reducer 502, the speed reducer 502 is connected with the gear 504, the gear 504 is connected with the rack 503 in a meshed mode, one end 506 of the drag chain is connected with a base of the speed reducer 502, one end of the drag chain is connected with the drag chain frame 507, and the drag chain frame 507.

Setting technological parameters and programs on a human-computer interaction interface at a PC end, and communicating with a PLC in a Profinet or Ethernet mode, so that a servo control driver is utilized to drive a motor to rotate, and the movement of a measuring host is further realized through a gear rack pair; plc utilizes a high-speed counter function to accurately position the door frame position and velocity by processing the data transmitted by the encoder, thereby aiding in guided control of the measured velocity and displacement.

Simultaneously, simultaneously acquiring data on the top surface and two side surfaces of the steel rail 6 by a line laser (point laser) by using a laser triangulation ranging method, wherein the measuring datum is the surface of two ends of a workpiece, and the intermediate data are both referenced by data bits of the two datum points; the two lasers synchronously move along the axial direction of a workpiece, data acquisition is carried out at a certain sampling frequency, the moving distance of the lasers is recorded at the same time, the data are transmitted to a PLC through an analog input module (AI) and digital-analog signals (A/D) are processed, the processed data are displayed at an operation end of a PC (personal computer) man-machine interaction page in a Profinet or Ethernet communication mode, the bending deformation direction and the numerical value of the steel rail are displayed, and segmented measurement, integral fitting and full-length straightness are adopted through software; and finally, determining the interval coordinates of the workpiece needing to be straightened by using a curvature description mode.

Claims

1. A rail non-contact laser measuring platform which is characterized in that: the device comprises a host frame, a base, a bracket, a measuring mechanism and a moving mechanism, wherein a linear guide rail of the moving mechanism is fixedly connected to the upper surface of the base, the bracket is fixedly connected to the upper surface of the base and positioned inside the linear guide rail of the moving mechanism, the host frame is connected with the linear guide rail of the moving mechanism in a sliding manner, and the measuring mechanism is fixedly connected inside the host frame.

2. The non-contact laser measuring platform for the steel rail according to claim 1, wherein: the measuring mechanism comprises a first line laser sensor, a second line laser sensor and a third line laser sensor, wherein the first line laser sensor is fixedly connected below the top of the main frame, and the second line laser sensor and the third line laser sensor are oppositely arranged on the upper part of the side face of the main frame.

3. The non-contact laser measuring platform for the steel rail according to claim 1, wherein: the moving mechanism comprises a servo motor, a speed reducer, a rack, a gear, a linear guide rail, a drag chain and a drag chain frame, wherein the rack is fixedly connected to the base and located on the outer side of the linear guide rail, the speed reducer is fixedly connected with the outer side of the lower portion of the host frame, an output shaft of the servo motor is connected with the speed reducer, the speed reducer is connected with the gear, the gear is meshed with the rack, one end of the drag chain is connected with a base of the speed reducer, one end of the drag chain is connected with the drag chain frame, and the drag chain frame is fixedly connected with.