CN218766996U - Static calibration device of laser high-speed benkelman deflectometer speed measurement sensor angle - Google Patents
Static calibration device of laser high-speed benkelman deflectometer speed measurement sensor angle Download PDFInfo
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- CN218766996U CN218766996U CN202223516488.2U CN202223516488U CN218766996U CN 218766996 U CN218766996 U CN 218766996U CN 202223516488 U CN202223516488 U CN 202223516488U CN 218766996 U CN218766996 U CN 218766996U
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Abstract
The application discloses static calibration device of high-speed benkelman deflectometer tacho-sensor angle of laser includes: the device comprises a supporting base, a sliding block, a driving device, a reflecting mirror and a displacement sensor. The supporting base extends along a plane, the sliding block is connected to the supporting base in a sliding mode, and the driving device is in transmission connection with the sliding block so as to drive the sliding block to translate along a straight line. The reflective mirror is connected to the sliding block and is perpendicular to the supporting base. The displacement sensor is arranged on the supporting base and used for detecting the translation distance of the sliding block. The angle static calibration device for the laser high-speed deflectometer speed measurement sensor is simple in structure, convenient to operate and high in portability, and has the advantages of short calibration time. The device has the advantages of carrying on the vehicle, calibrating at any time and calibrating quickly.
Description
Technical Field
The utility model relates to a calibration equipment technical field especially relates to a static calibration equipment of laser high speed benkelman deflectometer tachometer sensor angle.
Background
The Laser Doppler Vibrometer (LDV) is an important sensing unit of the laser high-speed deflectometer. The sensor measures and calculates the deflection speed of the road surface under the action of heavy load in real time by using the laser Doppler effect. A laser high speed deflectometer is usually equipped with a plurality of LDVs and based on their measurements, reproduces the deflectometer and maximum deflectometer of the road surface. This deflection measurement method has been increasingly used in china, denmark, australia, and the united states, etc.
To pick up as much as possible the speed of deflection of the road surface directly under the wheels, 1 or more LDVs are installed very close to the rear wheels of the trailer, whose emitted laser lines need to pass through the wheel gap between the rear axle twin tires onto the road surface. Meanwhile, in order to avoid the interference of the laser line and the double-tire axle, the installation included angle beta between the laser line emitted by the LDV and the vertical direction of the road surface is about 2 degrees. This angle is an important parameter in the deflection calculation and needs to be measured and calibrated accurately. The exact value of this angle is not easily determined, however, due to spatial layout, machining processes and mounting errors. In addition, except for the precise angle calibration required during factory shipment, the laser high-speed deflectometer needs to calibrate the angle again after being used for a period of time or being overhauled.
The existing angle calibration methods of the LDV can be divided into two types: static calibration in a laboratory and dynamic calibration of a rigid pavement. However, in the prior art, both calibration methods require large structural dynamic operation to complete the calibration task, and are complex to operate and difficult to operate. In the static calibration in a laboratory, an LDV is installed on a steel beam with the length of about 4m, then a measuring matching plate is arranged at the bottom, the size of the measuring matching plate is large, and during calibration, the measuring matching plate needs to be controlled to move so as to complete the calibration task. And after calibration, the steel beam needs to be mounted on the carriage, and the angle calibrated indoors may be different from the actual angle in the trailer carriage, since the mounting process may introduce uncertain disturbances. The rigid road dynamic calibration method is to calibrate on a rigid road according to the projection relation between the vehicle speed and the measured speed, but the method has the defects of the need of searching for a specific rigid road, vehicle speed fluctuation and the like, and has more complex operation mode and higher difficulty.
In view of this, the present invention is especially provided.
SUMMERY OF THE UTILITY MODEL
The utility model provides a static calibration device of laser high-speed deflectometer tachometer sensor angle.
The application provides the following technical scheme:
the utility model provides a static calibration device of high-speed benkelman deflectometer tacho-sensor angle of laser, includes:
a support base extending along a plane;
a slider slidably connected to the support base;
the driving device is in transmission connection with the sliding block so as to drive the sliding block to translate along a straight line;
the reflecting mirror is connected to the sliding block and is perpendicular to the supporting base;
and the displacement sensor is arranged on the supporting base and is used for detecting the translation distance of the sliding block.
Optionally, the supporting base comprises a narrow plate and a wide plate;
the wide plate body is connected to one end of the narrow plate body;
the slider set up in on the slat, just the slider can be followed the length direction translation of slat.
Optionally, the displacement sensor is arranged on the narrow slat, and the displacement sensor is located on one side of the sliding block departing from the wide board body.
Optionally, one end of the narrow lath, which is away from the wide plate body, is provided with a front end surface;
the narrow strip plate is provided with two side end surfaces along the width direction;
the front end face and the side end face are in smooth transition.
Optionally, the driving device comprises a motor and a lead screw, and the sliding block is provided with a thread groove;
the motor is in transmission connection with the lead screw, and the sliding block is in threaded connection with the lead screw through a thread groove;
the motor drives the lead screw to rotate so as to drive the sliding block to translate along the lead screw.
Optionally, the angle static calibration device for the laser high-speed deflectometer speed measurement sensor comprises a bracket, wherein the bracket is connected to the sliding block and is provided with a vertical plate perpendicular to the support base;
the reflector is arranged on the vertical plate.
Optionally, the reflector extends along the length direction of the vertical plate.
Optionally, the bracket comprises a horizontal plate, and the vertical plate is vertically connected to the horizontal plate;
the horizontal plate is attached to the sliding block.
Optionally, a leveling assembly is disposed on the supporting base.
Optionally, a plurality of threaded holes are formed in the support base;
the leveling assembly comprises a plurality of adjusting pieces, and each adjusting piece is provided with a stud;
and each stud is respectively in threaded connection with the corresponding threaded hole.
By adopting the technical scheme, make the utility model discloses following beneficial effect has:
the angle static calibration device for the laser high-speed deflectometer speed measurement sensor is simple in structure, convenient to operate and high in portability, and has the advantages of short calibration time. The device has the advantages of carrying along with the vehicle, calibrating at any time and quickly calibrating.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a schematic structural view of a static calibration device for an angle of a speed measurement sensor of a laser high-speed deflectometer according to an embodiment of the present invention;
fig. 2 is a side view angle diagram of the angle static calibration device of the laser high-speed deflectometer speed measurement sensor provided by the embodiment of the utility model, which is placed on the wheel gap of a trailer double-tire;
fig. 3 is a front view of the angle static calibration device of the laser high-speed deflectometer speed measurement sensor provided by the embodiment of the utility model, which is placed on the wheel gap of a trailer double-tire;
fig. 4 is a cross-sectional view of the slider and the driving device of the angular static calibration device of the laser high-speed deflectometer speed measurement sensor provided by the embodiment of the present invention in a matching state;
fig. 5 is the embodiment of the utility model provides a static calibration principle sketch of high-speed benkelman deflectometer speed sensor angle that laser provided.
In the figure, 1, a supporting base; 11. a narrow strip plate; 111. a front end face; 112. a side end face; 12. a wide plate body; 13. a leveling assembly; 131. an adjustment member; 2. a slider; 21. a slider body; 22. a nut portion; 23. a connecting arm; 3. a drive device; 31. a lead screw; 32. a motor; 4. a reflective mirror; 5. a displacement sensor; 6. a support; 61. a vertical plate; 62. a horizontal plate; 7. LDV; 8. a laser line; 81. incident laser lines; 82. reflecting the laser line; 83. directing a laser line directly; 9. a two-tube tire; 91. a two-wheeled axle; 10. a road surface.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept by those skilled in the art with reference to specific embodiments.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solution in the embodiments, and the following embodiments are used to illustrate the present invention, but do not limit the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or component to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 5, the static calibration apparatus for an angle of a speed measurement sensor of a laser high-speed benkelman beams deflectometer according to the embodiment of the present application includes: a supporting base 1, a slide block 2, a driving device 3, a reflecting mirror 4 and a displacement sensor 5. The supporting base 1 extends along a plane, the sliding block 2 is connected to the supporting base 1 in a sliding mode, and the driving device 3 is in transmission connection with the sliding block 2 to drive the sliding block 2 to translate along a straight line. The reflective mirror 4 is connected to the slider 2, and the reflective mirror 4 is perpendicular to the support base 1. The displacement sensor 5 is arranged on the supporting base 1, and the displacement sensor 5 is used for detecting the translation distance of the sliding block 2. The actual installation angle beta of the LDV7 can be obtained according to the length of the reflective mirror 4 and the measurement value of the displacement sensor 5. The device simple structure, convenient operation has the advantage that the calibration time is short, the portability is high moreover.
In a possible embodiment, shown in fig. 1, the support base 1 comprises a narrow strip 11 and a wide plate 12, the wide plate 12 being connected to one end of the narrow strip 11. The sliding block 2 is arranged on the narrow strip plate 11, and the sliding block 2 can translate along the length direction of the narrow strip plate 11. The design of the narrow strip plate 11 facilitates the device to be placed on the center line of the wheel gap (the middle position of the gap) of the trailer double-tire 9 for calibration. The wide plate body 12 has a large surface area, which is beneficial to projecting the reflected light of the reflecting mirror onto the wide plate body 12, and meanwhile, the wide plate body 12 has a large surface area, which is beneficial to the overall balance of the device.
In a possible embodiment, the displacement sensor 5 is arranged on the narrow strip 11, and the displacement sensor 5 is located on the side of the slider 2 facing away from the wide plate body 12, so as to avoid blocking the laser line 82 reflected by the reflective mirror 4. The displacement sensor 5 can detect the moving distance of the slider 2. The displacement sensor 5 is provided on the narrow strip plate 11.
In a possible embodiment, as shown in fig. 1, 2 and 3, a front end surface 111 is provided at one end of the narrow strip 11 facing away from the wide plate body 12, the narrow strip 11 has two lateral end surfaces 112 in the width direction, and the front end surface 111 and the lateral end surfaces 112 are in smooth transition. The front end surface 111 and the side end surfaces 112 form an arc-shaped guide surface which can play a role of guiding when the device is inserted into the wheel gap center line of the trailer double-tire 9.
In a possible embodiment, shown in fig. 4, the driving means 3 comprise a base, a motor 32 and a lead screw 31, the slide having a threaded groove. The motor is in transmission connection with the lead screw, and the sliding block is in threaded connection with the lead screw through a thread groove. The motor drives the lead screw to rotate so as to drive the sliding block to translate along the lead screw. Specifically, the slider 2 has a slider body 21, a nut portion 22, and a connecting arm 23, and the slider body 21 and the nut portion 22 are connected by the connecting arm 23. The nut portion 22 has a threaded groove, the lead screw 31 is rotatably mounted on the base, the lead screw 31 is partially located inside the base, the nut portion 22 is located inside the base, the motor 32 is in transmission connection with the lead screw 31, and the slider 2 is in threaded connection with the lead screw 31 through the nut portion 22. The motor 32 drives the lead screw 31 to rotate so as to drive the nut portion 22 to translate along the lead screw 31, and the nut portion 22 drives the slider body 21 to translate along the length direction of the lead screw 31 through the connecting arm 23.
In a possible embodiment, referring to fig. 1, the angle static calibration device for the laser high-speed deflectometer tachometer sensor comprises a bracket 6, wherein the bracket 6 is connected to the sliding block 2, the bracket 6 is provided with a vertical plate 61 perpendicular to the supporting base 1, and the reflective mirror 4 is arranged on the vertical plate 61. The motor 32 rotates the lead screw 31 to drive the slide 2 to translate along the lead screw 31, so that the reflective mirror 4 on the bracket 6 can also translate along with the translation of the slide 2.
In a possible embodiment, the reflective mirror 4 is extended along the length direction of the vertical plate 61. The laser line 8 emitted by the laser doppler vibrometer (LDV 7) is reflected by the reflector 4, and the reflected laser line 82 is projected on the upper plane of the wide plate 12. To a reasonable extent, the longer the mirror 4, the higher the accuracy of the measurement.
In a possible embodiment, the support 6 comprises a horizontal plate 62, the vertical plate 61 is vertically connected to the horizontal plate 62, and the horizontal plate 62 is attached to the sliding block 2. When the sliding block 2 slides, the horizontal plate 62 can also slide along with the sliding block.
In a possible embodiment, the support base 1 is provided with a levelling assembly 13. When the device is placed on a tested road surface 10, the leveling component 13 can adjust the upper plane of the supporting base 1 of the device to be in a horizontal state, so that the measuring accuracy is improved.
In a possible embodiment, a plurality of threaded holes are provided on the support base 1, and the leveling assembly 13 comprises a plurality of adjusting members 131, each adjusting member 131 having a stud, each stud being threaded into a corresponding threaded hole. And adjusting the upper plane of the support base 1 to be in a horizontal state by screwing each stud.
The embodiment of the application simultaneously provides a calibration principle of the angle static calibration device of the speed measurement sensor of the high-speed laser benkelman deflectometer.
Referring to fig. 5, the direct laser ray 83 emitted from the LDV7 can directly irradiate the a of the slider 2 without the blockage of the support 6 and the reflector 4 0 A position.
When the holder 6 and the mirror 4 are attached, the laser light line 81 incident on the LDV7 will be blocked. The upper and lower boundaries of the mirror 4 are respectively P 2 And P 1 The incident laser line 81 will be reflected outside the tire footprint.
At t 1 At the moment, the position of the mirror 4 is A 1 Incident laser line 81 at lower boundary P 1 Is reflected to B 1 And (4) point.
At t 2 At the moment, the mirror 4 is in the position A 2 Incident laser line 81 at upper boundary P 2 Is reflected to B 2 And (4) point.
Theoretically according to line segment P 2 A 2 And A 0 A 2 The ratio of (b) is the tangent value of the LDV7 installation angle beta. But due to A 0 The point is close to directly below the two-wheeled tire 9 and is not easily measured in space. At this point, the distance is converted.
Addition parallel to A 1 A 2 Auxiliary line P of 1 N, and P 2 A 2 、P 2 B 2 The intersection points of (a) and (b) are M and N, respectively. Suppose point A 1 And A 2 Is D; p is 1 P 2 Perpendicular distance P therebetween 2 M is L.
At right triangle P 1 MP 2 In addition, according to the geometric relationship, the method can know,
as can be seen from the foregoing, the line segments
I.e. equal to the effective length of the mirror 4. Therefore, only the line segment needs to be known
The accurate value of beta can be calculated to obtain beta.
In the rectangle P 1 A 1 A 2 Within M, according to geometric relationshipsIn a clear view of the above, it is known that,
while
I.e. the actual horizontal movement distance of the slide 2, can be measured by a displacement sensor 5 located on the support base 1.
The embodiment of the application also provides an operation process of the angle static calibration device of the speed measurement sensor of the high-speed laser benkelman deflectometer.
Step1, the device is placed on a wheel gap central line of a trailer double-tire 9, and the upper plane of a supporting base 1 is in a horizontal state through a high-precision level gauge and a leveling component 13 of the supporting base 1;
step2, starting the LDV7 of the 1 st station;
step3, the motor 32 drives the screw rod 31 to rotate so as to drive the sliding block 2 to enable the incident laser line 81 emitted by the LDV7 to irradiate the lower edge P of the reflective mirror 4 1 So that a clear reflection point B appears on the wide plate body 12 1 To that end, the reading d of the displacement sensor 5 at that time is recorded 1 ；
Step4, the motor 32 drives the lead screw 31 to rotate so as to drive the sliding block 2 to enable the incident laser line 81 emitted by the LDV7 to irradiate the upper edge P of the reflective mirror 4 2 So that a clear reflection point B appears on the wide plate body 12 2 For the purpose, the reading d of the displacement sensor 5 at that time is recorded 2 ；
Step5, in order to reduce the influence of system errors and accidental errors, step3 and Step4 are repeated, and a plurality of measured values d of the displacement sensor 5 are recorded 1 And d 2 Are respectively D 1 And D 2 The calculation method is shown in a formula;
step6, calculating the installation angle beta of the LDV7 according to a formula;
step7 closes the LDV7, opens the next LDV7, and repeats Step3 to Step6 until all the installation angles beta of the LDV7 are calibrated.
In the formula, d 1 I and d 2 I represents the result of the ith measurement; n represents the total number of repetitions.
To avoid interference of the laser line 8 with the twin axle 91, the angle β of the LDV7 with respect to the perpendicular to the road surface 10 is about 2 °. This angle is an important parameter in the deflection calculation and needs to be accurate. The installation angle beta of the LDV7 can be calculated through the measurement value of the angle static calibration device of the laser high-speed deflectometer speed measurement sensor and the formula.
For example: the effective geometric dimension of the mirror 4 is 1mm 40mm 200mm. Wherein, the upper and lower edges P 1 And P 2 L =200mm.
The number of repeated measurements was set to 5.
The slider 2 drives the reflector 4 to move back and forth, and 5 measured values of the displacement sensor 5 are respectively shown in a table 1.
TABLE 1 measurement values of the displacement sensor 5
| i | 1 | 2 | 3 | 4 | 5 |
| d1,i | 2.031 | 2.035 | 2.029 | 2.031 | 2.032 |
| d2,i | 10.072 | 10.059 | 10.064 | 10.054 | 10.062 |
Calculating the mean value D according to the formula 1 And D 2 2.0316mm and 10.0622mm, respectively.
The mounting angle β of the LDV was calculated to be 2.2994 ° according to the formula.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with reference to the above preferred embodiment, but not to limit the present invention, any person skilled in the art can make modifications or changes to equivalent embodiments by utilizing the above technical contents without departing from the scope of the present invention, and any simple modification, equivalent change and modification made to the above embodiments by the technical matters of the present invention are within the scope of the present invention.
Claims (10)
1. The utility model provides a static calibration device of high-speed benkelman deflectometer tacho-sensor angle of laser which characterized in that includes:
a support base extending along a plane;
a slider slidably connected to the support base;
the driving device is in transmission connection with the sliding block so as to drive the sliding block to translate along a straight line;
the reflecting mirror is connected to the sliding block and is perpendicular to the supporting base;
and the displacement sensor is arranged on the supporting base and is used for detecting the translation distance of the sliding block.
2. The angle static calibration device of the laser high-speed deflectometer tachometer sensor according to claim 1, wherein the support base comprises a narrow plate and a wide plate;
the wide plate body is connected to one end of the narrow plate body;
the slider set up in on the slat, just the slider can be followed the length direction translation of slat.
3. The angle static calibration device for the tachometer sensor of a laser high-speed benders according to claim 2, wherein the displacement sensor is arranged on the narrow strip plate and is located on the side of the slider away from the wide plate body.
4. The angle static calibration device of the laser high-speed deflectometer tachometer sensor according to claim 2, wherein one end of the narrow strip plate, which is far away from the wide plate body, is provided with a front end surface;
the narrow strip plate is provided with two side end surfaces along the width direction;
the front end face and the side end face are in smooth transition.
5. The angle static calibration device of the laser high-speed deflectometer speed sensor according to claim 1, wherein the driving device comprises a motor and a lead screw, and the slide block is provided with a thread groove;
the motor is in transmission connection with the lead screw, and the sliding block is in threaded connection with the lead screw through a thread groove;
the motor drives the lead screw to rotate so as to drive the sliding block to translate along the lead screw.
6. The angle static calibration device of the laser high-speed deflectometer speed sensor according to claim 1, characterized by comprising a bracket, wherein the bracket is connected to the sliding block and is provided with a vertical plate perpendicular to the supporting base;
the reflector is arranged on the vertical plate.
7. The angle static calibration device for the laser high-speed benders speed-measuring sensor according to claim 6, characterized in that the reflector is arranged to extend along the length direction of the vertical plate.
8. The angle static calibration device for the laser high-speed benders speed-measuring sensor according to claim 6, characterized in that the bracket comprises a horizontal plate, and the vertical plate is vertically connected to the horizontal plate;
the horizontal plate is attached to the sliding block.
9. The angle static calibration device of the laser high-speed deflectometer speed sensor according to claim 1, wherein a leveling component is arranged on the supporting base.
10. The angle static calibration device of the laser high-speed deflectometer speed sensor according to claim 9, wherein a plurality of threaded holes are arranged on the supporting base;
the leveling assembly comprises a plurality of adjusting pieces, and each adjusting piece is provided with a stud;
and each stud is respectively in threaded connection with the corresponding threaded hole.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223516488.2U CN218766996U (en) | 2022-12-28 | 2022-12-28 | Static calibration device of laser high-speed benkelman deflectometer speed measurement sensor angle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223516488.2U CN218766996U (en) | 2022-12-28 | 2022-12-28 | Static calibration device of laser high-speed benkelman deflectometer speed measurement sensor angle |
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| CN202223516488.2U Active CN218766996U (en) | 2022-12-28 | 2022-12-28 | Static calibration device of laser high-speed benkelman deflectometer speed measurement sensor angle |
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