CN211651516U

CN211651516U - Line laser rapid height measuring device

Info

Publication number: CN211651516U
Application number: CN202020069260.5U
Authority: CN
Inventors: 饶杨海; 温培刚
Original assignee: Shanghai Zhijin Information Technology Co ltd
Current assignee: Shanghai Zhijin Information Technology Co ltd
Priority date: 2020-01-13
Filing date: 2020-01-13
Publication date: 2020-10-09
Anticipated expiration: 2030-01-13

Abstract

The utility model relates to a line laser height finding device that hangs down, including the power, the line type laser instrument, the shift lens, the CCD sensor, PCB circuit board and year object plane, it is fixed dull and stereotyped face or for the smooth face on the assembly line to carry the object plane, it has the measured object to put on the object plane to carry, install the line type laser instrument directly over the object plane, the line type laser instrument is used for throwing the laser line downwards perpendicularly, the laser line projects to measured object and year object plane on, the shift lens is arranged in the slant, the laser line after measured object and year object plane reflection is imaged in the shift lens of slant, and become burnt on the CCD sensor, PCB sensor electricity is connected to the CCD sensor circuit board, output net gape and IO port are connected to the output of PCB circuit board, the line type laser instrument is respectively through the line connection power; the utility model discloses can measure the object height of process on the assembly line fast reliably, it is low to have effectively improved prior art's measurement accuracy, and speed is slow, the poor scheduling problem of reliability.

Description

Line laser rapid height measuring device

[ technical field ]

The utility model belongs to the technical field of the measurement technique and specifically relates to a line laser rapid height measurement device.

[ background art ]

In the existing visual height measurement technology, measurement precision, measurement speed and measurement stability and reliability are key points for technical improvement. At present, the contactless height measurement technologies mainly include the following technologies: laser height measurement, visual height measurement and triangular height measurement. The laser height measurement (1) is a laser ranging technology, and the distance is obtained by measuring the time difference between the emitted laser and the received laser and then multiplying the light speed. (2) The visual height measurement is to take a picture of the measured object by using a camera and estimate the height or distance of the object through the image of the object on a sensor. (3) The triangulation height measurement is to use line laser to hit on the measured object, then use the camera to shoot, utilize the difference of the angle of illumination and shooting angle, calculate the height of the measured object.

The height measuring schemes all have certain disadvantages: (1) the laser ranging precision is not high, and the laser ranging precision is mainly a measuring point, so that the whole height of an object cannot be measured completely at one time. (2) The visual height measurement needs a fixed scene, the requirements on the brightness of the environment, the light angle and the like are high, the measurement is not accurate, and the technology needs complex software for processing, so that the processing speed and the measurement speed are low. (3) The triangulation technique is relatively good, utilizes line laser, shoots with the camera, utilizes the poor better measuring object of ability of angle high speed, but this angle difference does not well reach linear interval, and the error is still little, if operational environment has constantly vibrations, can to a great extent influence measurement accuracy, and the reliability is not enough.

[ contents of utility model ]

The utility model aims at solving foretell not enough and providing a line laser rapid height finding device, can measure the object height of process on the assembly line fast reliably, it is low effectively to have improved prior art's measurement accuracy, and speed is slow, the poor scheduling problem of reliability.

In order to realize above-mentioned purpose design a line laser height fast measuring device, including power 1, line type laser instrument 2, tilt-shift lens 3, CCD sensor 4, PCB circuit board 5 and carrier surface 6, carrier surface 6 is fixed dull and stereotyped face or for the smooth face on the assembly line, the measured object 7 has been placed on carrier surface 6, install line type laser instrument 2 directly over carrier surface 6, line type laser instrument 2 is used for throwing the laser line perpendicularly downwards, the laser line projection is to measured object 7 and carrier surface 6 on, tilt-up arrangement of tilt-shift lens 3, through the laser line formation of image after measured object 7 and carrier surface 6 reflection to oblique ascending tilt-shift lens 3 in to become burnt on CCD sensor 4, PCB circuit board 5 is connected to CCD sensor 4 electricity, output net gape and IO gape are connected to PCB circuit board 5's output, PCB circuit board 5, The line lasers 2 are connected to the power supply 1 through lines, respectively.

Further, a U-shaped bracket 8 spans above the object carrying surface 6, and the linear laser 2 is fixed at the middle position above the U-shaped bracket 8.

Further, the shift lens 3, the CCD sensor 4 and the PCB circuit board 5 are assembled into a closed camera, which is installed at the same height as the line laser 2 but at a different horizontal position.

Compared with the prior art, the utility model, can realize the high measurement quick simultaneously to a plurality of objects, especially on fast-speed assembly line, can short-term test through object quantity, width and height, measuring result is accurate and quick, and the detection range who has solved market sensor is narrow, and high measurement is not accurate, and the function singleness, the detection speed can not follow up the functioning speed scheduling problem on the assembly line, has realized the collection and has detected, measure, discernment, calculate the laser altimetry function of integration, is worth popularizing and applying.

[ description of the drawings ]

FIG. 1 is a schematic block diagram of the present invention;

fig. 2 is a schematic structural diagram of the present invention;

FIG. 3 is an imaging schematic of the present invention;

FIG. 4 is the cross-ratio theorem height calculation formula of FIG. 3;

fig. 5 is a flow chart of height measurement according to the present invention;

FIG. 6 is a flowchart of the calculation of the center coordinate of the laser line according to the present invention;

in the figure: 1. the device comprises a power supply 2, a linear laser 3, a shift lens 4, a CCD sensor 5, a PCB 6, an object carrying surface 7, an object to be measured 8 and a U-shaped bracket.

[ detailed description of the invention ]

The invention is further described below with reference to the accompanying drawings:

as shown in the attached drawings, the utility model provides a line laser rapid height measuring device, which comprises a power supply 1, a line type laser 2, a shift lens 3, a CCD sensor 4, a PCB circuit board 5 and an object carrying surface 6, wherein the object carrying surface 6 is a fixed flat surface or a smooth surface on a production line, an object to be measured 7 is placed on the object carrying surface 6, the line type laser 2 is installed right above the object carrying surface 6, the line type laser 2 is used for vertically projecting laser lines downwards, the laser lines are projected on the object to be measured 7 and the object carrying surface 6, the shift lens 3 is arranged obliquely upwards, the laser lines reflected by the object to be measured 7 and the object carrying surface 6 are imaged in the shift lens 3 which is obliquely upwards, and the CCD sensor 4 is focused on the CCD sensor 4, the CCD sensor 4 is electrically connected with the PCB circuit board 5, the output end of the PCB circuit board 5 is connected with the output network port and the IO port, and the PCB circuit board 5 and the linear laser 2 are respectively connected with the power supply 1 through circuits. Wherein, a U-shaped bracket 8 is spanned above the object carrying surface 6, and the linear laser 2 is fixed at the middle position above the U-shaped bracket 8; the shift lens 3, the CCD sensor 4 and the PCB circuit board 5 are assembled into a closed camera, and the camera is installed at the same height but different horizontal positions with the linear laser 2.

The measuring method of the line laser rapid height measuring device comprises the following steps: firstly, a beam of linear laser is vertically irradiated on a measured object 7 and an object carrying surface 6 through a linear laser 2, a reflected laser line is imaged on a CCD sensor 4 after passing through a shift lens 3, objects with different heights pass through the positions of measuring lines and then are projected on different lines of the CCD sensor 4, the positions of the projected lines and the height of the measured object 7 form a certain projection relation, and the height of the measured object 7 can be measured by calibrating a measurement coefficient through an object with known height; when a plurality of measured objects 7 pass through the measuring line simultaneously, the measured objects can be simultaneously measured by projecting onto different columns on the CCD sensor 4.

In the utility model, an ARM processor and an FPGA chip are arranged in the PCB 5, when the PCB 5 collects the image information on the CCD sensor 4, the image information is transmitted to the FPGA chip, and then the median line is extracted from the input image data stream; and then the ARM processor controls exposure and photographing, reads the median line data, and finally identifies the number of the object to be measured 7 and calculates the height of the object to be measured 7 according to the cross-ratio theorem. The method comprises the following steps of extracting a median line by an image data stream entering an FPGA chip: the method comprises the steps of presetting Gaussian curve template data, then carrying out geometric transformation on an input image data stream, searching a single-row minimum value and recording coordinates by solving the difference convolution of a real-time curve and a Gaussian distribution curve on an image, and then solving the coordinate position of a laser projection center line.

The utility model comprises a power supply, an object carrying surface, a linear laser, a shift lens, a CCD sensor, a PCB circuit board and an output port; the object carrying surface can be a fixed flat surface or a smooth surface on the production line and is mainly used for placing an object to be measured; the linear laser is arranged right above the object carrying surface and is mainly used for irradiating a thin and bright straight line and projecting the straight line onto an object to be measured and the object carrying surface; the tilt-shift lens, the CCD sensor and the PCB are assembled into a closed camera, and the camera is arranged on the same height with the linear laser but different horizontal positions, so that a certain difference angle is formed between the emission angle of the linear laser and the imaging angle, and a focal plane is formed on the CCD sensor conveniently. The utility model discloses the device is used for many objects on the assembly line, wide range, high-speed reliable and reliable measuring height, and it is low to improve prior art's measurement accuracy effectively, and speed is slow, the poor scheduling problem of reliability.

The utility model discloses a working process includes imaging process and data processing process. The imaging process is as shown in figure 3, a beam of linear laser is firstly vertically irradiated on a measured surface, the measured surface is imaged on a CCD sensor after passing through a shift lens, objects with different heights pass through the positions of measuring lines and then are projected on different lines of the CCD sensor, the positions of the projected lines and the height of the measured object form a certain projection relation, and the measurement coefficient is calibrated by using the object with the known height, so that the height of the measured object can be measured; when a plurality of objects pass through the measuring line simultaneously, the objects can be projected onto different columns on different CCD sensors, so that the simultaneous measurement of the objects and the measurement of the width of the objects are realized. In order to enable objects with different heights to be clearly imaged in the camera, the included angle between the shift lens and the CCD sensor can be changed, and the shift lens principle is utilized, so that the effect of completely clearly imaging is achieved. The projection of the imaging object on the CCD sensor follows the projective geometric cross ratio invariance (as shown in figure 4), and the height of the measured object is calculated by using the cross ratio invariance. As shown in fig. 5 and fig. 6, the data processing procedure is that, after image information on the CCD sensor is acquired, the image information is transmitted to the FPGA, and then the input image data stream is processed in S230; presetting a value S231, then carrying out S233 transformation on input data, and obtaining the best matching effect by obtaining the minimum value S234 on the image, thereby obtaining the coordinate position of the laser projection center line; and then the ARM software controls the camera to perform S220, the ARM end reads the calculation result of the S230, and the number, the position and the height of the objects are calculated and identified according to the S130 through the ARM software.

As shown in the attached figure 2, the utility model discloses the typical application detects through height, width isoparametric of article on the assembly line, sees whether up to standard to provide control signal for the next stage of assembly line. If the flow line speed of accurate control, the utility model discloses can also be used to the three-dimensional scanning of object appearance. In the attached fig. 2, the object carrying surface 6 is a smooth hard surface and is located at the lowest part for mounting a bracket, placing an object to be measured 7 and projecting laser. A U-shaped support 8 is arranged across the object carrying surface, the linear laser 2 is fixed in the middle above the U-shaped support 8, the linear laser 2 vertically projects a laser line downwards, the reflected laser line is imaged into the upward oblique shift lens 3 and is focused on the CCD sensor 4, and the focused image fully reflects the height and width information of the object to be measured; and then the image is transmitted to the PCB 5 for processing.

The present invention is not limited by the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and are all included in the protection scope of the present invention.

Claims

1. The utility model provides a line laser rapid height measurement device which characterized in that: comprises a power supply (1), a linear laser (2), a shift lens (3), a CCD sensor (4), a PCB circuit board (5) and an object carrying surface (6), wherein the object carrying surface (6) is a fixed flat surface or a smooth surface on a production line, a measured object (7) is placed on the object carrying surface (6), the linear laser (2) is installed right above the object carrying surface (6), the linear laser (2) is used for vertically projecting a laser line downwards, the laser line is projected onto the measured object (7) and the object carrying surface (6), the shift lens (3) is obliquely arranged upwards, the laser line reflected by the measured object (7) and the object carrying surface (6) is imaged into the shift lens (3) obliquely upwards and is focused on the CCD sensor (4), the CCD sensor (4) is electrically connected with the PCB circuit board (5), the output end of the PCB circuit board (5) is connected with an output port and an IO port, the PCB circuit board (5) and the linear laser (2) are respectively connected with the power supply (1) through lines.

2. The line laser rapid height finding device according to claim 1, characterized in that: a U-shaped support (8) is arranged above the object carrying surface (6) in a crossing mode, and the linear laser (2) is fixed in the middle position above the U-shaped support (8).

3. The line laser rapid height finding device according to claim 1 or 2, characterized in that: the tilt-shift lens (3), the CCD sensor (4) and the PCB circuit board (5) are assembled into a closed camera, and the camera is installed at the same height but different horizontal positions with the linear laser (2).