CN102607361A - Automatic detection device for double-row-graduated-line measuring instrument - Google Patents

Abstract

The invention discloses an automatic verification device for measuring instruments with double-row engraved lines, which is composed of an image acquisition module, a light source lighting module, an appliance positioning module, a measurement platform and a computer processing and display module; the image acquisition module is composed of a CMOS camera and a zoom lens; the light source The lighting module is composed of two strip-shaped LED light sources that emit white light; the appliance positioning module is composed of guide rails, two left and right sliders and two left and right fixtures; the processing and display module is composed of a display and a host computer, and the computer processing display module and image acquisition module The data lines are connected; the measurement platform is used to fix the image acquisition module, the light source lighting module and the appliance positioning module through the fixing bracket and the sleeve. The device can realize the automatic reading of the appliance data, the image data is sent to the computer through the USB interface, and the self-developed software automatically calculates, recognizes and displays the reading results. The hardware structure is simple, and the software is easy to operate.

Description

An automatic verification device for measuring instruments with double-row engraved lines

technical field

The invention relates to a measuring instrument reading device, in particular to a high-precision automatic verification device for the measurement data of the measuring instrument with the feature of double-row engraved lines.

the

Background technique

With the rapid development of production and science and technology, the requirements for reading accuracy, efficiency and reading of instruments are getting higher and higher, such as reducing human errors. At present, domestic caliper manufacturers still use manual methods to verify the caliper, that is, after zeroing, rely on human eyes to judge whether the zeroing is aligned. The caliper is a measuring instrument with the characteristics of double rows of engraved lines. There are a large number of engraved lines on its surface. When the traditional manual reading is used for verification, there are always the following disadvantages: manual readings have subjective errors caused by individual differences; Limited misreading and misreading; during the verification, it is necessary to observe each caliper repeatedly, and reading for a long time will cause visual fatigue and reduce work efficiency. Therefore, in order to improve the quality of products, it is very important to establish a complete, reliable and efficient automatic reading system to verify the measuring instruments.

单双排刻线的指针式器具、指针式电压、电流表等

数显式仪表自动读数。至今没有关于对具有双排刻线特征的器具自动读数方法的报道。此类器具在计量测试领域中还不可或缺，有着广泛应用。 In order to solve the above problems, the applicant considers designing a set of automatic verification device for measuring instruments with double-row engraved lines, and uses computer software to distinguish the readings after image collection for automatic reading verification judgment. The reading device needs to be considered in the design process as follows Several technical problems: 1. The appliance is made of alloy steel, and it is easy to produce strong specular emission when illuminated by ordinary light sources, which will affect the reading results. 2. The double rows of engraved lines are not on the same horizontal plane, and it is easy to cause uneven gray scale when illuminated by ordinary light sources, which will affect the reading results. 3. Position and align the reticles among a large number of reticles. At present, the research on the automatic reading device of measuring instruments at home and abroad mainly focuses on

Pointer instruments with single and double rows of engraved lines, pointer voltage and ammeters, etc.

Digital display meter automatic reading. So far there is no report about the automatic reading method for the utensils with the feature of double row of reticles. Such instruments are also indispensable in the field of metrology and testing, and have a wide range of applications.

the

Contents of the invention

Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the present invention is: to provide an efficient and fast double-row engraved measuring instrument automatic verification device that can improve the reading accuracy; Gaps in reading technology.

In order to solve the problems of the technologies described above, the following technical solutions are adopted in the present invention:

An automatic verification device for measuring instruments with double-row engraved lines, which is characterized in that it includes:

A measuring platform, four level adjusting nuts are screwed under the measuring platform, the level adjusting nuts are used to support the measuring platform and adjust the measuring platform to make it level, the measuring platform is equipped with a fixed bracket and a level, and the fixed bracket is used for installation and fixing The light source lighting module and the image acquisition module, the spirit level is used to observe whether the measurement platform is level, the surface of the measurement platform is provided with a plurality of through holes, and the through holes are used to install and fix the appliance positioning module;

An appliance positioning module includes a guide rail, two sliders and two fixtures, the guide rail is horizontally installed on the measurement platform, the two sliders are slidably clipped and fitted on the guide rail, and the fixtures are respectively installed on On the two sliders, two clamps are used to clamp the measuring instruments to be tested between them;

A light source lighting module, including two strip-shaped LED light sources that emit white light, and the LED light sources are horizontally installed on the fixed bracket of the measurement platform;

An image acquisition module, including a CMOS camera and a zoom lens, the zoom lens is installed below the CMOS camera, and the two are vertically installed on the fixed bracket of the measurement platform and positioned directly above the light source lighting module ;

A computer processing and display module, the computer processing and display module includes a display and a host, the host is connected to the image acquisition module through a data line to transmit image data, the host analyzes and processes the data through an internal data processing module, and passes The display shows the reading results.

When this device is used for verification work, first adjust the four level adjustment nuts under the measurement platform, and judge whether the measurement platform is level by observing whether the water bubble in the level meter is in the center of its circular spherical surface; The measuring instrument is reset to zero, placed on the instrument positioning module, and positioned between the two fixtures; secondly, the data cable is used to complete the connection between the image acquisition module and the computer processing display module; and the power source of the light source lighting module is turned on again. The specific verification and measurement process is as follows: the light emitted by the light source lighting module is irradiated on the device under test at a low angle of incidence, the image acquisition module receives the reflected light from the surface of the device and images it on the CMOS photosensitive element, and transmits the image data through the data line Transfer to the processing display module, call the data processing module in the host computer to analyze and process the image data, determine the reading m and alignment line n on the main scale, and calculate the final reading result according to the caliper reading formula m+n×p, where p It is the measurement accuracy of the caliper. Finally, the test result is displayed on the display. If the test reading result is zero, it is qualified, and if the reading result is non-zero, it is unqualified. In the above-mentioned process, the specific processing process of the data processing module in the host computer is executed by computer software, specifically, the software module of the existing computer graphics reading processing technology can be used, so the data processing module can use the existing technology, so it will not be described in detail here . In the technical solution, the appliance positioning module is composed of a guide rail, two sliders and two clamps, and the two clamps are respectively fixed on the two sliders and can slide freely horizontally on the guide rail together with the sliders. In this way, when the present invention is used for automatic reading of the caliper, the clamp and the slide block make it very convenient to take, place and locate the caliper. At the same time, the caliper can also slide freely horizontally on the guide rail to facilitate the reading of different measurement data. On the one hand, since the distance between the two sliders is not fixed, it is possible to read a variety of different types of calipers, which greatly expands the application range of the device.

As an optimization, the fixed bracket is a guide column fixed on the measurement platform, a sleeve is slidably arranged on the guide column, and a positioning knob for fixing the sleeve on the guide column is arranged on the sleeve, the Both the light source lighting module and the image acquisition module are installed on the sleeve. After such optimization, the adjustment sliding and positioning on the guide column can be realized by the sleeve, so as to adjust the height of the light source lighting module and the image acquisition module to meet the detection requirements.

As a further optimization, the image acquisition module also includes a camera mounting base, the camera mounting base can be slidably arranged on the sleeve up and down, the CMOS camera is fixed on the camera mounting base, and the camera mounting base is also provided with a camera The positioning knob, the camera positioning knob is used to fix the camera mount on the sleeve. After such optimization, the fine adjustment of the height of the image acquisition module can be realized by sliding and fixing the camera mount on the sleeve up and down, so as to increase the accuracy of image acquisition adjustment. At the same time, this optimization makes it possible to adjust the height positions among the measuring instruments to be tested, the light source lighting module and the image acquisition module, so that when facing different measuring instruments to be tested, the light source lighting module and the image acquisition module can be adjusted The height position makes it achieve the best image acquisition effect.

As a further optimization, the light source lighting module also includes a light source installation frame and two light source installation boards, the two strip-shaped LED light sources emitting white light are respectively installed on the two light source installation boards, and the two light source installation boards are respectively The rotating shaft horizontally arranged in the middle of both ends is rotatably installed on the light source installation frame, two light source installation plates are arranged side by side at intervals and one light source installation plate is located above the other light source installation plate to form a high and low light source, and the zoom in the image acquisition module The vertical projection of the lens on the measurement platform can pass through the gap between the two light source mounting plates and fall on the guide rail on the measurement platform. After such optimization, when facing different measuring instruments to be tested, not only can the height of the light source lighting module and the image acquisition module be adjusted; When , the light can be just emitted to the zoom lens of the image acquisition module to ensure the image acquisition effect to the greatest extent. In addition, setting up two light sources and adopting the method of one high and one low is also aimed at the fact that the scale lines of the double-line measuring instruments are not on the same horizontal plane, and the use of one high and one low light on both sides can make the gray scale of light reflection more uniform. Guarantee the reading results; at the same time, the light source adopts a white light strip LED light source, which is also aimed at the characteristics that the double-row engraved measuring instruments are made of alloy steel. Using white light can better reflect the engraved line characteristics of the instrument to be tested. The structure of the above-mentioned high and low light sources can avoid the strong specular reflection of the instrument to be tested and affect the reading result; ensure the accurate reading.

In summary, the present invention has the following advantages:

1. The present invention obtains the measurement reading results of the appliance through fast computer calculation, which has the advantages of fast and efficient reading, and can realize functions such as automatic data collection, real-time display, processing, and error prompts. Automatic reading of various types of calipers can be realized.

2. The present invention is especially suitable for the caliper verification department to detect the caliper error produced. It can quickly judge whether the produced caliper is qualified in a complete, reliable and efficient manner, improve the detection efficiency and reduce labor costs while ensuring product quality.

3. The present invention also has the following effects: a, the image data is sent into the computer through the USB interface, and the reading result is automatically calculated by the preset program of the host computer; b, the computer is used to monitor the whole process of the reading detection; c, the automatic data is realized Acquisition, real-time display, processing and other functions. the

the

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the device of the present invention.

Fig. 2 is a flow chart of computer software used when the device of the present invention is implemented.

the

Detailed ways

The process, principle and effect of the present invention will be further described in detail below in conjunction with specific implementation methods, drawings and specific experimental analysis.

During specific implementation, as shown in Figure 1, an automatic verification device for measuring instruments with double-row engraved lines, including:

A measuring platform 4, four horizontal adjustment nuts 14 are screwed under the measuring platform, the horizontal adjusting nuts 14 are used to support the measuring platform 4 and adjust the measuring platform 4 to make it level, the measuring platform 4 is provided with a fixed bracket and a spirit level 15, The fixed bracket is used to install and fix the light source lighting module and the image acquisition module, and the spirit level 15 is used to observe whether the measurement platform is level. The surface of the measurement platform is provided with a plurality of through holes, and the through holes are used to install and fix the appliance positioning module; during specific implementation, The spirit level is an existing mature product, which has a transparent container with a raised middle, and a bubble inside the container. When the bubble is in the middle of the raised surface, the surface measurement platform is already level;

An appliance positioning module 3 includes a guide rail 9, two sliders 10 and two fixtures 11, the guide rail 9 is horizontally installed on the measurement platform 4, and the two sliders 10 are slidably clamped and fitted on the guide rail 9 Above, the clamps 11 are installed on the two sliders 10 respectively, and the two clamps 11 are used to clamp the measuring instrument to be tested between them;

A light source lighting module 2, including two strip-shaped LED light sources 8 that emit white light, and the LED light sources 8 are horizontally installed on the fixed bracket of the measurement platform;

An image acquisition module 1 includes a CMOS camera 6 and a zoom lens 7, and the zoom lens 7 is installed below the CMOS camera 6, and the two are vertically installed on the fixed support of the measurement platform 4 together and are positioned at the Directly above the light source lighting module 2;

A computer processing display module 5, the computer processing display module 5 includes a display 12 and a host 13, the host 13 is connected with the image acquisition module 1 by a data line 16, and carries out the transmission of image data, and the host 13 passes the internal data The processing module analyzes and processes the data, and displays the reading result through the display 12 .

During specific implementation, the fixed bracket is a guide column 17 fixed on the measurement platform, and a sleeve 18 is slidably arranged on the guide column 17, and a sleeve 18 is provided on the sleeve 18 for fixing the sleeve 18 on the guide column 17. Both the light source lighting module 2 and the image acquisition module 1 are installed on the sleeve 18 . The image acquisition module 1 also includes a camera mount, the camera mount can be slid up and down on the sleeve 18, the CMOS camera 6 is fixed on the camera mount, and the camera mount is also provided with a camera positioning Knob, the camera positioning knob is used to fix the camera mount on the sleeve 18. The light source lighting module 2 also includes a light source mounting frame and two light source mounting plates, the two white-emitting strip-shaped LED light sources 8 are respectively mounted on the two light source mounting plates, and the two light source mounting plates are respectively arranged horizontally on the The rotating shafts in the middle of both ends are rotatably installed on the light source installation frame, two light source installation plates are arranged side by side at intervals and one light source installation plate is located above the other light source installation plate, and the zoom lens 7 in the image acquisition module 1 is placed on the measurement platform The vertical projection on 4 can pass through the gap between the two light source mounting plates and fall on the guide rail 9 on the measuring platform 4 .

Hereinafter, taking the 50-degree vernier caliper as an example, the specific implementation of the present invention will be further described in more detail.

When the measuring device is used to detect a 50-degree vernier caliper, it may be as follows, and its structure includes: an image acquisition module, a light source lighting module, an appliance positioning module, a measuring platform, and a computer processing and display module. in:

1. Image acquisition module

-1M摄像头，像素为1280至1024，遵循USB2.0标准。变焦镜头是宾得（PENTAX）公司专用于机器视觉的百万像素系列型号为C2514-M的可变焦工业镜头，此镜头兼容性好，水平视角为20°，镜头焦距为25mm。 The image acquisition module consists of a CMOS camera and a zoom lens. The CMOS camera can be selected from the MVC-

-1M camera with pixels ranging from 1280 to 1024, following the USB2.0 standard. The zoom lens is a variable-focus industrial lens of megapixel series model C2514-M specially used by PENTAX for machine vision. This lens has good compatibility, the horizontal viewing angle is 20°, and the lens focal length is 25mm.

2. Light source lighting module

The light source lighting module is composed of two white-emitting strip LEDs that are not at the same height, the irradiation angle is freely adjustable, and the effective lighting area is 50-20mm ² .

3. Appliance positioning module

The appliance positioning module includes a guide rail, two slide blocks and two clamps, the clamps are respectively fixed on the slide blocks, and the slide blocks can move horizontally and freely on the guide rails. The rail is 45mm long.

4. Measurement platform

The measurement platform is used to install and support the above-mentioned image acquisition module and light source lighting module through the fixed bracket and the sleeve. There are four level adjustment nuts under the measurement platform. The level adjustment nuts are used to support the measurement platform and adjust the measurement platform to make it level. A level is provided on the platform, and the level can be used to observe whether the measuring platform is level. The surface of the measuring platform is provided with 10-19 through holes for installing and fixing the appliance positioning module.

5. Computer processing display module

The computer processing display module is composed of a display and a host.

(1) Possess the data communication interface required by the above image acquisition module;

(2) It has the functions of automatic data collection and real-time display;

The appliance positioning module is connected to the measurement platform through a through hole on the measurement platform, and the image acquisition module and the light source lighting module are connected to the measurement platform through a fixed bracket of the measurement platform. The image acquisition module is connected with the computer processing and display module through the USB data line, so that the computer can easily obtain the required image data. The computer processing and display module processes and displays the image data of the instrument reading surface collected by the image acquisition module.

Instrument reading measurement: place the instrument to be tested on the fixture, adjust the distance between the sliders and the position of the slider on the guide rail and fix it, so that all the effective reading areas on the surface of the appliance enter the field of view of the image acquisition module, and measure the data Take non-contact measurements.

Fig. 2 has reflected a kind of software working flowchart that can be adopted in the computer processing display module in the present invention, as shown in it, the present invention directly enters the measurement interface when in use. First click to connect the camera, when the dialog box pops up when the camera is connected correctly, then click the start camera button, the camera has been started at this time, and you can start to collect video image data in real time. If you want to pause the shooting, just click the pause shooting button, and you only need to click the start camera button again to collect data again. Before reading, you must first set the zero error setting. There are two ways to set the zero error: one is to manually input the zero error on the premise of knowing the zero error of the appliance, and directly click the input zero error button; the other method is Directly call the program to automatically read the zero error, just click the button to read the zero error. Then click the Get Reading button to get the reading result and display it on the monitor in real time. If it is determined that there is no zero error in the appliance, you can also directly click the Get Reading button to calculate and display the reading. Since connecting the camera and starting the camera are the prerequisites for the normal operation of the system, an error prompt is set, that is, if you directly perform other operations on the system without a correct connection or starting the camera, a prompt dialog box will pop up to guide the operator to follow the correct instructions. Steps to use this inventive device.

Claims (4)

1. a double groove measurement instrument automatic calibrator is characterized in that, comprising:

A measuring table; The measuring table below spins and is provided with four horizontal adjustment nuts, and the horizontal adjustment nut is used to support measuring table and regulates measuring table makes its level, and measuring table is provided with fixed support and level meter; Fixed support is used for installing and fixed light source lighting module and image capture module; Level meter is used to observe whether level of measuring table, and the measuring table surface is provided with a plurality of through holes, and through hole is used for installing and the fixer locating module;

A utensil locating module; Comprise a guide rail; Two slide blocks and two anchor clamps, said guide rail level is installed on the measuring table, said two slide blocks slidably snap fit on guide rail; Said anchor clamps are installed on respectively on two slide blocks, and two anchor clamps are used for the measurement instrument to be detected between two anchor clamps is clamped;

A light illumination module comprises two bar-shaped LED light sources that emit white light, and said led light source level is installed on the fixed support of measuring table;

An image capture module comprises a CMOS camera and a zoom lens, and said zoom lens is installed on said CMOS camera below, the two vertically be installed on the fixed support of measuring table more together and be positioned at said light illumination module directly over;

A Computer Processing display module; Said Computer Processing display module comprises a display and a main frame; Main frame links to each other with image capture module through data line; Carry out image data transmission, said main frame passes through inner data processing module analyzing and processing data, and carries out reading result demonstration through display.

2. double groove measurement instrument automatic calibrator as claimed in claim 1; It is characterized in that; Said fixed support is the guidepost that is fixed on the measuring table; Be mounted slidably sleeve on the guidepost, said sleeve is provided with and is used for sleeve is fixed on the positioning knob on the guidepost, and said light illumination module and image capture module are installed on the sleeve.

3. double groove measurement instrument automatic calibrator as claimed in claim 2; It is characterized in that; Said image capture module also comprises a camera mount pad, and said camera mount pad can slide up and down to be arranged on the sleeve, and said CMOS camera is fixed on the camera mount pad; Also be provided with the camera positioning knob on the camera mount pad, the camera positioning knob is used for the camera mount pad is fixed on sleeve.

4. double groove measurement instrument automatic calibrator as claimed in claim 2; It is characterized in that; Said light illumination module also comprises light source installation frame and two light source installing plates; Said two bar-shaped LED light sources that emit white light are installed in respectively on two light source installing plates; Two light source installing plates are installed in rotation on the light source installation frame by the rotating shaft that is horizontally placed on its middle part, two ends respectively; Two light source installing plate spacing parallel arranging settings and a light source installing plate are positioned at another light source installing plate top, in the said image capture module zoom lens the vertical projection on the measuring table can pass two between the light source installing plate the position, space and drop on the guide rail on the measuring table.

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