CN214668334U - Rebound modulus detector based on image speckle technology - Google Patents
Rebound modulus detector based on image speckle technology Download PDFInfo
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- CN214668334U CN214668334U CN202120881776.4U CN202120881776U CN214668334U CN 214668334 U CN214668334 U CN 214668334U CN 202120881776 U CN202120881776 U CN 202120881776U CN 214668334 U CN214668334 U CN 214668334U
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Abstract
The utility model discloses a resilience modulus detector based on image speckle technology, which comprises a shell, a pressure head device, a control panel, a shooting system and an illumination system, wherein the pressure head device is connected with an external universal testing machine to provide load pressure, and the shooting system and the illumination system are arranged in the shell; the indenter device extends through the housing and aligns an indenter at an end of the indenter device with the test piece. The utility model discloses a CCD high definition camera is surveyed material strain among the loading process, can record completely, the stress-strain characteristic of analysis loading in-process material, rethread computer software carries out the analysis to observing the image and calculates, can directly confirm the resilience modulus value of material, improved material stress-strain relation testing result's accuracy when simplifying test operation, and then improved the detection precision to material resilience modulus, have easy operation, the precision is high, high efficiency, the operation is stable, characteristics such as safety.
Description
Technical Field
The utility model relates to a material check out test set technical field especially relates to a to inorganic binder stabilized material resistance to compression modulus of resilience based on image speckle technical detector.
Background
The compression-resistant resilience modulus of the inorganic binder stable material is characterized by the capability of the material for resisting vertical deformation by measuring the ratio of the stress of the material to the corresponding resilience strain under the action of load, is one of important strength indexes of a pavement base material, and is definitely taken as one of the strength indexes of pavement structure design in the current road asphalt pavement design (JTG D50-2017) specification.
The method for measuring the modulus of resilience of the inorganic binder stabilizing material is generally a T0807 method in road engineering inorganic binder stabilizing material test regulation (JTG E51-2009), a press machine or a universal testing machine is used for providing test pressure, a test piece is loaded and unloaded, strain generated by the test piece in the loading and unloading processes is detected through a dial indicator, and finally a resilience deformation-pressure curve is manually drawn according to an observation result so as to calculate the modulus of resilience of the material. The standard method measures the deformation of a test piece in the test process through a dial indicator, a special dial indicator frame and the dial indicator need to be installed before the test, and the dial indicator needs to be calibrated and debugged, so that the test process is complicated; in addition, the change of the reading of the dial indicator needs to be observed manually at any time while the load is controlled to be applied in the test process, and the moving pointer is directly subjected to parameter reading in the process of strain change, so that the problems of low precision of the measurement result and the like caused by inaccurate parameter reading are easily caused. Moreover, after the test is finished, the read rebound deformation value and the read pressure value are manually drawn into a rebound strain-pressure curve, and then the compression-resistant rebound modulus value of the material is calculated.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to the defect that prior art exists, provide a structural design simply, easily realize, need not contact measuring instrument and simplified the test procedure, reducible artificial visual error who reads the parameter and produce need not manual drawing resilience stress-strain curve, the resilience modulus detector based on image speckle technique that the testing result accuracy is high.
In order to solve the technical problem, the utility model adopts the following technical scheme: the utility model provides a modulus of resilience detector based on image speckle technique, includes casing, pressure head device and control panel, and pressure head device is connected in order to provide load pressure with outside universal tester, its characterized in that: the device also comprises a shooting system and an illumination system, wherein the shooting system and the illumination system are arranged in the shell and respectively form a real-time observation mechanism for the position of the test piece, and the shooting system and the illumination system are both connected with the control panel; the indenter device extends through the housing and aligns an indenter at an end of the indenter device with the test piece.
Further, the photographing system employs a CCD camera, which is mounted on an inner wall of the housing.
Furthermore, the shell is provided with a sealing door, a sealing space is formed inside the shell by closing the sealing door, and a sealing environment can be formed inside the shell in the test process, so that the disturbance of the external environment to the test process is eliminated, and the accuracy of the detection result is improved; a liquid crystal speckle calibration plate for focusing and debugging the CCD camera is arranged on the inner surface of the closed door, and black and white grid-shaped focusing patterns are arranged on the liquid crystal speckle calibration plate; the CCD camera is installed on the back plate inside wall of the shell. Before the test, the imaging of the CCD camera is calibrated through a liquid crystal speckle calibration plate so as to ensure the accuracy of the detection result.
Furthermore, a base is arranged on the bottom plate of the shell, is positioned between the CCD camera and the closed door and is positioned on the same straight line with the CCD camera and the liquid crystal speckle calibration plate; the pressure head device penetrates into the shell from the top plate of the shell, so that the pressure head is opposite to the base up and down.
Furthermore, a guide sleeve is arranged on a top plate of the shell and sleeved on the lifting rod of the pressure head device to protect the lifting rod and the shell.
Furthermore, the illumination system comprises two LED lamps which are respectively arranged on the inner walls of the left side plate and the right side plate of the shell and respectively aim at the test piece from the left side and the right side. The control panel controls and adjusts the shooting system and the illumination system, and can adjust the illumination angle and the illumination intensity so as to ensure the imaging definition of the CCD camera.
Furthermore, the device also comprises a speckle template used for wrapping the observation surface of the test piece, black and white grid scattered spots are formed on the speckle template, and the speckle spots are formed by spraying paint.
Furthermore, the device also comprises a data transmission line which is externally connected out from the shell to be connected with an external computer, so that the output and the processing of the detection data are realized.
The utility model discloses a CCD high definition camera is surveyed material strain in the loading process, can record completely, the stress-strain characteristic of analysis loading in-process material, and rethread computer software carries out the analytical computation to observing the image, can directly confirm the resilience modulus value of material, has improved the accuracy of material stress-strain relation testing result when simplifying test operation, and then has improved the detection precision to material resilience modulus; the testing device is of an integral structure, the testing operation space is optimized by matching with the use of a universal testing machine, and the interference of the external environment to the detection process is eliminated, so that the detection quality of the material resilience modulus is improved. The inside LED light source and the liquid crystal calibration board that are equipped with of device can control and adjust imaging quality, has simplified experimental operation step, makes the utility model has the advantages of simple operation, it is high to detect the precision, and detection efficiency is high, can carry out the analysis to the stress-strain relation of loading overall process material, and equipment operation is stable, safe.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the inner plane of the present invention;
fig. 3 is a schematic diagram of a speckle template sprayed on a test piece.
In the drawing, 1 is the casing, 2 is the closing door, 3 is liquid crystal speckle calibration board, 4 is the pressure head device, 41 pressure heads, 5 is control panel, 6 is the LED lamp, 7 is the CCD camera, 8 is the base, 9 is data transmission line, 10 is the speckle template, 11 is the guide pin bushing.
Detailed Description
The invention will be further explained by means of specific embodiments with reference to the accompanying drawings:
in the embodiment, referring to fig. 1 to 3, the rebound modulus detector based on the image speckle technology includes a housing 1, a pressure head device 4 and a control panel 5, wherein the pressure head device 4 is connected with an external universal tester to provide a load pressure, and further includes a shooting system and an illumination system, the shooting system and the illumination system are arranged in the housing 1 and respectively form a real-time observation mechanism for the position of a test piece, and both the shooting system and the illumination system are connected with the control panel 5; the indenter device 4 extends through the housing 1 and aligns an indenter 41 at the end of the indenter device 4 with the test piece.
The camera system employs a CCD camera 7, which is mounted on the inner wall of the housing 1.
The shell 1 is provided with the sealing door 2, a sealing space is formed inside the shell 1 by closing the sealing door 2, and a sealing environment can be formed inside the shell in the test process, so that the disturbance of the external environment to the test process is eliminated, and the accuracy of the detection result is improved; a liquid crystal speckle calibration plate 3 (which can be a display screen) for focusing and debugging a CCD camera 7 is arranged on the inner surface of the closed door 2, and black and white grid-shaped focusing patterns are arranged on the liquid crystal speckle calibration plate 3; the CCD camera 7 is mounted on the rear panel inner side wall of the housing 1. Before the test, the imaging of the CCD camera 7 is calibrated through the liquid crystal speckle calibration plate 3 so as to ensure the accuracy of the detection result.
A base 8 is arranged on the bottom plate of the shell 1, and the base 8 is positioned between the CCD camera 7 and the closed door 2 and is positioned on the same straight line with the CCD camera 7 and the liquid crystal speckle calibration plate 3; the ram device 4 is inserted into the housing 1 from the top plate of the housing 1 so that the ram 41 faces the base 8 in the vertical direction.
A guide sleeve 11 is arranged on the top plate of the shell 1, and the guide sleeve 11 is sleeved on the lifting rod of the pressure head device 4 so as to protect the lifting rod and the shell 1.
The illumination system comprises two LED lamps 6 which are respectively arranged on the inner walls of the left side plate and the right side plate of the shell 1 and respectively aim at the test piece from the left side and the right side. The control panel 5 controls and adjusts the shooting system and the illumination system, and can adjust the illumination angle and the illumination intensity to ensure the imaging definition of the CCD camera 6.
The speckle template 10 is used for wrapping the observation surface of the test piece, black and white grid scattered spots are formed through the speckle template 10, and the speckle spots are formed by spraying paint. The speckle template 10 can adopt a rubber grating plate with a part of hollow parts, before the test, the surface of the observation surface of the test piece is sprayed with black primer, and then the speckle template 10 is used for wrapping the observation surface of the test piece and spraying white speckles, so that black and white speckle points are formed on the observation surface of the test piece.
The device also comprises a data transmission line 9, wherein the data transmission line 9 is outwards connected out from the shell 1 to be connected with an external computer, so that the output and the processing of the detection data are realized.
The working process is as follows: the instrument is placed on an objective table of a universal testing machine, the center of a pressure head device 4 and the center of a loading plate of the universal testing machine are adjusted to be in a coaxial position, a loading plate of the testing machine is placed in a groove in the upper end of the pressure head device 4, and a fixing bolt is screwed to enable the pressure head device 4 to be connected with the loading plate of the testing machine. The loading plate pressing head device 4 is adjusted to ascend to the top of the device through adjusting the universal testing machine, the data transmission line 9 is connected with an external computer, the liquid crystal speckle calibration plate 2 on the inner side of the closed door 2 is opened through the control panel 5 arranged on the outer side of the device shell 1, and the CCD camera 7 is controlled through the control panel 5 to focus so that the liquid crystal speckle calibration plate 2 can clearly image in the camera.
Preparing a test piece with a standard size according to a method required by a specification, curing the test piece according to the curing conditions and the age required by the specification, uniformly blacking the observation surface of the test piece by using black paint after the curing of the test piece is finished, wrapping the observation surface of the test piece by using the speckle template 10, and spraying white paint to form scattered black and white spots on the observation surface. After the test piece is processed, the observation surface of the test piece is placed on the base 8 in a direction aligning to the lens direction of the CCD camera 7, then the illumination intensity and the illumination direction of the LED lamp 6 are adjusted, so that the observation surface can be imaged clearly in the CCD camera 7, and the load plate of the testing machine is adjusted to fall so that the pressure head 41 of the pressure head device 4 is placed at the top of the test piece.
And (3) closing the closing door 2, controlling the universal testing machine to load downwards at the speed of 1mm/min, setting the selected value of the unit pressure of the pressure head 41 to be 0.2-0.7 MPa for different materials, and setting the image acquisition time interval of the CCD camera 7 to be 1 s. Prepressing is carried out according to a standard method, then unit pressure is equally divided into 5-6 equal parts to serve as pressure values loaded each time, unloading is carried out after 1-level load is applied for 1min, the load is applied step by step in the same way, and the CCD camera 7 is kept for image acquisition all the time in the loading process. After the loading process is finished, the collected image is imported into an external computer, the image can be analyzed through Ncor module software built in MATLAB, so that a stress-strain relation curve of the material in the loading process is determined, and then the rebound modulus value of the material is calculated through a T8070-2 formula in road engineering inorganic binder stable material test regulation (JTG E51-2009).
The above detailed description of the present invention is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereto, i.e. all equivalent changes and modifications made in accordance with the scope of the present invention should be covered by the present invention.
Claims (8)
1. The utility model provides a modulus of resilience detector based on image speckle technique, includes casing, pressure head device and control panel, and pressure head device is connected in order to provide load pressure with outside universal tester, its characterized in that: the device also comprises a shooting system and an illumination system, wherein the shooting system and the illumination system are arranged in the shell and respectively form a real-time observation mechanism for the position of the test piece, and the shooting system and the illumination system are both connected with the control panel; the indenter device extends through the housing and aligns an indenter at an end of the indenter device with the test piece.
2. The apparatus according to claim 1, wherein the apparatus further comprises: the shooting system adopts a CCD camera which is arranged on the inner wall of the shell.
3. The apparatus according to claim 2, wherein the apparatus further comprises: the shell is provided with a sealing door, and a sealing space is formed inside the shell by closing the sealing door; a liquid crystal speckle calibration plate for focusing and debugging the CCD camera is arranged on the inner surface of the closed door, and black and white grid-shaped focusing patterns are arranged on the liquid crystal speckle calibration plate; the CCD camera is installed on the back plate inside wall of the shell.
4. The apparatus according to claim 3, wherein the apparatus further comprises: a base is arranged on the bottom plate of the shell, is positioned between the CCD camera and the closed door and is positioned on the same straight line with the CCD camera and the liquid crystal speckle calibration plate; the pressure head device penetrates into the shell from the top plate of the shell, so that the pressure head is opposite to the base up and down.
5. The apparatus according to claim 4, wherein the apparatus further comprises: a guide sleeve is arranged on a top plate of the shell and sleeved on a lifting rod of the pressure head device.
6. The apparatus according to claim 3, wherein the apparatus further comprises: the illumination system comprises two LED lamps which are respectively arranged on the inner walls of the left side plate and the right side plate of the shell and respectively aim at the test piece from the left side and the right side.
7. The apparatus according to claim 1, wherein the apparatus further comprises: the device also comprises a speckle template used for wrapping the observation surface of the test piece, black and white grid scattered spots are formed through the speckle template, and the speckle spots are formed by spraying paint.
8. The apparatus according to claim 1, wherein the apparatus further comprises: the computer also comprises a data transmission line which is externally connected out from the shell to be connected with an external computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120881776.4U CN214668334U (en) | 2021-04-26 | 2021-04-26 | Rebound modulus detector based on image speckle technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120881776.4U CN214668334U (en) | 2021-04-26 | 2021-04-26 | Rebound modulus detector based on image speckle technology |
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| Publication Number | Publication Date |
|---|---|
| CN214668334U true CN214668334U (en) | 2021-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120881776.4U Active CN214668334U (en) | 2021-04-26 | 2021-04-26 | Rebound modulus detector based on image speckle technology |
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| CN (1) | CN214668334U (en) |
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2021
- 2021-04-26 CN CN202120881776.4U patent/CN214668334U/en active Active
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