CN102313749B - Laser speckle detection device and method for tire of engineering machine - Google Patents
Laser speckle detection device and method for tire of engineering machine Download PDFInfo
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- CN102313749B CN102313749B CN 201010219549 CN201010219549A CN102313749B CN 102313749 B CN102313749 B CN 102313749B CN 201010219549 CN201010219549 CN 201010219549 CN 201010219549 A CN201010219549 A CN 201010219549A CN 102313749 B CN102313749 B CN 102313749B
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Abstract
The invention discloses a laser speckle detection device and a laser speckle detection method for a tire of an engineering machine. Negative pressure is applied to the external environment of the tire, the tire is horizontally arranged and is driven to rotate, and the inner side and the outer side of the tire are detected by using two probes respectively, so that the detection of defects of a deep layer inside the tire is facilitated; therefore, the defects existing inside the tire and specific positions of the defects are accurately detected, so that the accuracy of flaw detection inside the tire of the engineering machine is improved and optimized. The detection device comprises a vacuum device which forms a negative pressure environment, and a testing device and a rotating device which are arranged inside the vacuum device, wherein the testing device is used for testing the inner side and the outer side of a detected tire by using a laser speckle technology respectively, and is provided with an inner probe and an outer probe, namely two independently-controlled and operated laser probes which can be moved and positioned along the vertical and horizontal directions; and the rotating device is used for bearing the detected tire and driving the detected tire to synchronously rotate.
Description
Technical field
The present invention relates to a kind of device and detection method that adopts inside and outside 2 laser probes to carry out the laser speckle carrying out flaw detection for the tire under the rotation status, belong to rubber manufacturing machinery and industrial automation.
Background technology
Follow in recent years developing rapidly of the industries such as domestic mining, construction work, service property (quality) for the large-scale engineering machinery tire is had higher requirement, use the restriction of place environment, overweight load and road surface conditions for it, off-the-road tyre should possess higher wearing quality, anti-piercing through and height overload performance, thus inside tires Defect detection check (such as mass defects such as air entrapment and delaminations) is just seemed particularly important.
The method of inspection of existing domestic conventional project machinery tire, to implement pick test by destructive test, this type of detection method only can be estimated the qualification rate of workmanship substantially, can't guarantee that but all tires that dispatch from the factory reach criterion of acceptability, and the air entrapment defective can't detect by these type of conventional sense means.Because the existence of air entrapment can directly cause off-the-road tyre easily to be blown out under the environment of above-mentioned heavy duty or inclement condition, thereby make the uncontrollable automobile steering of driver and be easy to occur the major accident of car crash.
Also just like the following existing detection method of disclosed another kind of formerly applying for a patent, the application number of this patent is 200410077522.8, name is called laser speckle nondestructive detector for tyre, wherein in being provided with the sensing chamber of vacuum plant by the detection head motion be connected with one can be vertically, level and the laser speckle detector head that rotatablely moves.Below detection head, it is the tire automatic positioning equipment for carrying and location tire.Described detection head motion comprises the detection head connecting link and the horizontal mobile mechanism that is connected with connecting link, vertical movement mechanism, rotational motion mechanism that is connected with detection head.Described rotational motion mechanism comprises rotary drive motor, swing pinion, rotary connector.Described tire automatic positioning equipment comprises for the detecting head of measuring diameter of tyres and is used for the indoor conveying belt of carrying and mobile tyre, detecting head moves by the indoor conveying belt of computer program-driven after recording diameter of tyres, thereby makes tire be positioned central authorities of sensing chamber.
The technical scheme that provides such as above-mentioned patent, tire is delivered to sensing chamber inside and namely is positioned a fixed position, one cover driving mechanism of tire top drives detection head and rotates in a circumferential direction and examinations along tire inboard or the outside, so there is following shortcoming and defect in this patent:
For the large-scale engineering machinery tire, its thickness changes the inside tires gas volume that causes by external pressure greatly and changes and be difficult to cause and surface of tyre deformation as only detecting in tire inboard or the outside, be difficult to detect the defective of inside tires deep layer.
The inside and outside footpath of off-the-road tyre is larger, during the laser probe rotation, needs larger radius of turn, easily causes larger vibration influence detection efficiency and effect when rotation stops.
Adopt a laser detection head to take pictures along circumferentially being rotated, its level, adjusting vertical or the rotation angle are subject to larger restriction, are unfavorable for the raising of image definition and detection efficiency.
Summary of the invention
The invention provides a kind of laser speckle detection device for off-the-road tire and method thereof, its purpose is to solve defective and the deficiency that exists in the prior art, in the handoff procedure that carries out successively normal pressure and negative pressure of vacuum environment, with the tire horizontal positioned and drive its rotation, utilize 2 probes to carry out the laser imaging of taking pictures for sidewall, medial and lateral and tyre surface respectively, thereby the light path phase place that causes before and after the reconstruction deformations of tyre changes, and detects exactly possibility and particular location that inherent vice exists.
The object of the invention is, cause its outside surface generation deformation based on tire because of outside negative pressure environment, thereby the light path phase place that the surface of tyre deformation that utilizes laser probe to detect to cause owing to air entrapment or delamination causes changes, thereby determine and exactly inherent vice is positioned, the operation such as size measurement, improve and optimize the accuracy of the inner carrying out flaw detection of off-the-road tyre.
Another goal of the invention is, overcome because the defective that causes of inside tires structure (more easily causes the deformation on the corresponding surface of tire from the defective of surface of tyre close to more at ipsilateral representing intensity not to the impact that detects, intensity between defective and the surface of tyre is more large more to be difficult to reflect the deformation of defective under different conditions), detect in tire inboard or the outside respectively, to improve the accuracy that detects.
Goal of the invention also is, control also reduces the defective that detects because of single laser probe rotation and improves the quality that detects operation, with the detection demand of the giant tire that is adapted to different physical dimension, section width specification.
For achieving the above object, described laser speckle detection device for off-the-road tire mainly includes:
Form the vacuum plant of detection of negative pressure environment, and the proving installation and the whirligig that are arranged on vacuum plant inside.Be with the difference of prior art,
Proving installation is used for carrying out respectively phase place in detected tire medial and lateral takes pictures, and it has interior probe and the outer probe that can move along the vertical and horizontal directions and locate, and namely has the laser probe of 2 independent controls and operation.
Whirligig is used for carrying and drives detected tire synchronously being rotated, and namely detected tire rotates together with whirligig in testing process.
Based on above-mentioned basic improvement project, inboard or the outside of adopting inside and outside 2 laser probes to center on respectively, independently detected tire are detected, and the position impact on detection accuracy effectively can overcome one's shortcomings.
The testing result that inside and outside laser probe forms can improve comparatively significantly the accuracy of detection, and can't there be the blind area of detection in the tire under the rotation status.
For further improving the sharpness of tire photographic images and avoiding existing the blind area, can take following improvement project:
Described proving installation includes, and is used for carrying out in detected tire inboard the phase place process of taking pictures, and probe vertically carries out the interior probe rotatable mechaninism of rotation adjusting in the control.
Be used for carrying out in the detected tire outside phase place process of taking pictures, control the outer probe rotatable mechaninism that outer probe vertically carries out the rotation adjusting, and control outer probe and vertically carry out the highly vertical micro-adjusting mechanism of outer probe of adjusting.
Further improvement and refinement scheme for described whirligig are, whirligig has the turret of the detected tire of surface bears thereon, turret is connected in by bearing holder (housing, cover) and is located at driven gear in the rotating shaft, and driven gear is rotated by motor-driven by the driving gear that is connected with a joggle.
Rotating shaft is installed on the center of base, and the bottom of base is provided with the bearing that bears the vertical acting force of turret, is provided with equably several and is used for the auxiliary bearing that bears turret level and vertical acting force on base.
The additional modifications scheme of carrying out for described vacuum plant is that vacuum plant includes vacuum chamber, dress tire door and pressure relief device.Wherein, proving installation and whirligig are installed in the vacuum chamber, and vacuum chamber is connected in vacuum pump.
For improving the wobble accuracy of inside and outside 2 laser probes on level, vertical and photo angle and control dirigibility, the proving installation of admissible following feature refinement.Particularly,
Proving installation includes a frame, be provided with simultaneously in frame pop one's head in driving, outer probe is along the elevating mechanism of vertical movement, is provided with interior probe horicontal motion mechanism and outer probe horicontal motion mechanism at elevating mechanism.
Probe rotatable mechaninism in interior probe horicontal motion mechanism is installed.
Pop one's head in outside the vertical micro-adjusting mechanism of outer probe is installed on the horizontal mobile mechanism, outer probe rotatable mechaninism is installed on the vertical micro-adjusting mechanism of popping one's head in outside.
Foregoing is the improvement project of laser speckle detection device for off-the-road tire provided by the present invention.
Can be achieved as follows off-the-road tyre laser speckle detection method based on using above-mentioned detection device:
Carry out in the handoff procedure of normal pressure and negative pressure of vacuum environment in vacuum plant inside, adopt laser speckle technique to rebuild the light path phase place that causes before and after the detected deformations of tyre and change, by possibility and the particular location of phase image to determine that detected inside tires defective exists before and after the deformation of contrast common sector.
Different from existing detection method is that in testing process, detected tire is carried on the whirligig and with whirligig and synchronously is rotated.
Interior probe in the proving installation, outer probe detect for inside and outside sidewall and the tyre surface of detected tire respectively.
Further improvement and refinement scheme are, include the step of popping one's head in detected tire inboard in the control, vertically carrying out photo angle rotation adjusting in testing process.
The improvements that also can take are, include the step of popping one's head in the detected tire outside outside controlling, vertically positioning highly adjusting and photo angle rotation adjusting in testing process.
For optimizing 2 laser probes for the different sectors of tire under the rotation status take pictures precision and the controllability of imaging, in testing process, include, under detected tire original state, adopt 2 probes respectively for take pictures the 1st testing process of imaging of interior, upper lateral part sidewall and tyre surface
And after will being detected 180 ° of tire flip verticals, for take pictures the 2nd testing process of imaging of sidewall, bottom, remaining medial and lateral.
The embodiment of more optimizing is, in the 1st testing process and the 2nd testing process, respectively in turn with reference to state take pictures, vacuumize, stress state is taken pictures, tire rotation, with reference to state is taken pictures, release, stress state are taken pictures detecting step;
When taking pictures imaging each time, the medial and lateral of detected tire are divided into different sectors to realize the detection of whole piece tire.
Such as the described basic means of above-mentioned detection method and flow process, the essence of detection method of the present invention be exactly in turn carry out with reference to state take pictures, change the test cabinet internal pressure, stress state takes pictures to finish the detection of each sector of tire.
Detecting principle is by the outside tires environment is applied negative pressure, make its air entrapment or delamination form deformation because external pressure changes at outer surface of tire, adopt the mode of laser interference principle and Shearing Photography to rebuild the light path phase place variation that causes before and after the deformations of tyre, and determine its size and position in tire.
Content to sum up, laser speckle detection device for off-the-road tire of the present invention and method thereof have following advantage and beneficial effect:
1, realized for the improvement that has the laser speckle detection method now, by rotatablely moving of tire, the level of 2 laser probes, vertically and rotation campaign to implement comprehensive detection for sidewall, tire shoulder, tyre surface so that image is more clear and stable, thus the accuracy of Effective Raise detection;
2, can be adapted to the thicker present situation of off-the-road tyre sidewall and tyre surface, there is larger difference in the deformation that air entrapment causes in inside and outside both sides, and adopt outer probe and interior probe to carry out respectively the mode that the inside and outside both sides of tire are detected, can effectively guarantee correctness and integrality that sidewall, tyre surface are detected;
3, can optimize and reduce taking up room of proving installation and whirligig, detect and processing cost thereby effectively save;
4, can be adapted to the demand of the giant tire detection of different physical dimension and section width specification;
Description of drawings
Now the present invention is described further by reference to the accompanying drawings;
Fig. 1 is the structural representation of described laser speckle detection device;
Fig. 2 is the structural representation of described proving installation;
Fig. 3 is the structural representation of described whirligig;
Fig. 4 is the structural representation of described vacuum plant;
Fig. 5 is the location of 2 laser probes in the described testing process and the schematic diagram of taking pictures;
Have vacuum plant 1, proving installation 2, whirligig 3, tire 4 such as Fig. 1 to shown in Figure 5;
Interior probe horicontal motion mechanism 23, line slideway 231, synchronous pulley 232, motor 233, Timing Belt 234, angle sheave 235, briquetting 236, band tooth support 237, interior probe moves horizontally frame 238;
Outer probe horicontal motion mechanism 24, motor 242, Timing Belt 243, angle sheave 244, briquetting 245, band tooth support 246, outer probe moves horizontally frame 247;
Interior probe rotatable mechaninism 25, motor 251, active synchronization belt wheel 252, Timing Belt 253, driven synchronous pulley 254, swing shaft 255, fixed block 256;
In Fig. 5, A, B, C point be interior probe 26 in the adjustment of tire 4 inboards and the position of taking pictures, D, E, F, G point are that outer probe 28 is in the adjustment in tire 4 outsides and the position of taking pictures.
Embodiment
Embodiment 1, and to shown in Figure 5, described laser speckle detection device for off-the-road tire mainly has such as Fig. 1, forms the vacuum plant 1 of detection of negative pressure environment,
Be arranged on proving installation 2 and the whirligig 3 of vacuum plant 1 inside.Wherein,
Proving installation 2 is used for carrying out respectively phase place in detected tire 4 medial and lateral takes pictures, and it has interior probe 26 and the outer probe 28 that can move along the vertical and horizontal directions and locate.
Vacuum plant 1 is connected with vacuum pump by vacuum chamber 11 and is connected and form, and vacuum chamber 11 adopts steel frame constructions.A dress tire door 13 and 2 self-action pressure relief devices 14 also are set on the vacuum chamber 11, can control make-break operation by 1 operation valve between vacuum chamber 11 and the vacuum pump 12.
Described proving installation 2 has a unit frame 21, be provided with the elevating mechanism 22 that the driving laser probe moves up and down in frame 21, be fixed with interior probe horicontal motion mechanism 23 and outer probe horicontal motion mechanism 24 at elevating mechanism 22, to control moving horizontally of 2 laser probes.
Be provided with interior probe rotatable mechaninism 25 at interior probe horicontal motion mechanism 23, to realize the rotation campaign of interior probe 26.
Popping one's head in outside also is provided with the vertical micro-adjusting mechanism 27 of outer probe on the horizontal mobile mechanism 24, vertically carries out trimming movement to realize outer probe 28.Popping one's head in outside is provided with outer probe rotatable mechaninism 29 on the vertical micro-adjusting mechanism 27, to realize the rotation campaign of outer probe 28.
Elevating mechanism 22 has the vertical line guide rail 223 that is installed in upper spider 211 both sides, between two line slideways 223, be connected with a crane 226 that drives by following driving mechanism, this driving mechanism comprises a motor 221, the driving shaft of motor 221 connects a ball-screw 222 and drives its rotation, 224 on the nut that is enclosed within on the ball-screw 222 is fixed on the crane 226, and crane 226 is fixedly connected on the slide block 225 of line slideway 223.
Be fixed with two line slideways 231 at crane 226, its slide block connects respectively interior probe horizontally moving device 23 and outer probe horizontally moving device 24, operates with the tangential movement that realizes respectively inside and outside 2 laser probes by following 2 driving mechanisms.
The driving mechanism of the interior probe horizontally moving device 23 in 2 driving mechanisms comprises that one drives the motor 233 of synchronous pulley 232 rotations, 232 of synchronous pulleys pass through Timing Belt 234 and connect angle sheaves 235, and the briquetting 236 by clamping Timing Belt 234 and be connected tooth support 237 to connect interior the probe to move horizontally frame 238, realize its tangential movement.
In addition, the driving mechanism of outer probe horizontally moving device 24 comprises that one drives the motor 242 of synchronous pulley 241 rotations, 241 of synchronous pulleys pass through Timing Belt 243 and connect angle sheaves 244, and the briquetting 245 by clamping Timing Belt 243 and be connected tooth support 246 to connect to pop one's head in outward to move horizontally frame 247, realize its tangential movement.
The vertical micro-adjusting mechanism 27 of described outer probe connects by being fixed on two vertical line slideways 273 that outer probe moves horizontally on the frame 247, by following driving mechanism to realize the trimming movement operation of outer probe 28 in the vertical directions.Driving mechanism comprises that one drives the motor 272 of active synchronization belt wheel 271 rotations, 271 of active synchronization belt wheels pass through Timing Belt 274 and connect driven synchronous pulley 277, and the briquetting 275 by clamping Timing Belt 274 and be connected tooth support 276 to connect the vertical travelling carriage 278 of outer probe, realize that outer 28 trimming movement at vertical direction of popping one's head in operate.
Described interior probe rotatable mechaninism 25 comprises that one is fixed in the motor 251 of interior probe arm 239, and its output shaft connects an active synchronization belt wheel 252 and drives its rotation.Active synchronization belt wheel 252 connects driven synchronous pulley 254 by Timing Belt 253, and driven synchronous pulley 254 is set on the end of swing shaft 255, to drive swing shaft 255 rotations.The fixed block 256 that is connected in interior probe arm 239 is set in the interlude of swing shaft 255, and interior probe 26 is fixed in the other end of swing shaft 255, to realize the rotation campaign of interior probe 26.
Described outer probe rotatable mechaninism 29 comprises that one is fixed in the motor 291 of the vertical travelling carriage 278 of outer probe, and its output shaft connects an active synchronization belt wheel 292 and drives its rotation.Active synchronization belt wheel 292 connects driven synchronous pulley 294 by Timing Belt 293.Driven synchronous pulley 294 is set on the end of swing shaft 295, drives swing shaft 295 rotations.The fixed block 296 that is connected in the vertical travelling carriage 278 of outer probe is set in the interlude of swing shaft 295, and outer probe 28 is fixed in the other end of swing shaft 295, to realize the rotation action of outer probe 28.
Described whirligig 3, comprise a base 31, there is a rotating shaft 32 at the center of base 31, clutch shaft bearing 33 is housed in the rotating shaft 32, makes it bear the main radial force of turret 38, the axial force of turret 38 is mainly born the second bearing 34 by another of base 31 bottoms, connect a driving gear 36 on the output shaft of motor 35, drive driven gear 37 rotations by engagement, driven gear 37 is connected with turret 38 again, and turret 38 is rotated centered by rotating shaft 3.
Be evenly equipped with the 3rd bearing 39 on the base 31, make it bear certain axial and radial force so that turret 38 stability of rotation as supplemental support.
Based on the detection method of using above-mentioned laser speckle detection device for off-the-road tire, carry out in the handoff procedure of normal pressure and negative pressure of vacuum environment in vacuum plant 1 inside, adopt the laser means of taking pictures to rebuild the light path phase place that causes before and after detected tire 4 deformation and change, by possibility and the particular location of phase image to determine that detected tire 4 inherent vices exist before and after the deformation of contrast common sector.
In testing process, detected tire 4 is carried on the whirligig 3 and with whirligig 3 and synchronously is rotated, and the interior probe 26 in the proving installation 2, outer probe 28 carry out for the inside and outside sidewall of detected tire 4 and tyre surface respectively that laser is taken pictures and imaging.Wherein,
Include in testing process, probe 26 is in detected tire 4 inboards, vertically carry out the step that the photo angle rotation is regulated in the control; The outer probe 28 of control is in detected tire 4 outsides, vertically position the step of highly regulating with photo angle rotation adjusting.
And the division result of more refinement is, includes in testing process, adopts 2 probes respectively for take pictures the 1st testing process of imaging of interior, upper lateral part sidewall and tyre surface under detected tire 4 original states,
And after will being detected 180 ° of tire 4 flip verticals, for take pictures the 2nd testing process of imaging of sidewall, bottom, remaining medial and lateral.
In the 1st testing process and the 2nd testing process, in turn carry out respectively normal pressure take pictures imaging, vacuumize, negative pressure is taken pictures imaging, the detecting step of release reduction;
When taking pictures imaging each time, the medial and lateral of detected tire 4 are divided into different sectors to form many group contrast images.
The described laser speckle detection method of the present embodiment is taken pictures through repeatedly carrying out normal pressure in fact exactly, is vacuumized, negative pressure is taken pictures, the detection of each sector of tire was also finished in release originally.Consider because sidewall and the tyre surface of off-the-road tyre are all thicker, and the deformation that the bubble of inside tires causes in inside and outside both sides might differ larger, so utilize outer laser probe and inner laser probe that both sides inside and outside the tire are detected simultaneously.
Concrete testing process is as follows:
At first, the upper sidewall of tire 4 is detected, concrete course of action is as follows:
(1), tire is put on the correct position of wheelwork 3 according to the physical dimension of tire 4, the dress tire door 13 of vacuum chamber 11 is closed;
(2), the relevant action according to probe 26 and outer probe 28 in the physical dimension of tire 4 puts in place;
(3), interior probe 26 and outer probe 28 start working, and takes the photo of the first sector under normal pressure;
(4), vacuum pump 12 is extracted into set pressure with vacuum chamber 11, interior probe 26 and outer probe 28 take the photo of this sector under negative pressure, and two width of cloth pictures are carried out inter-process, finish the detection of this sector;
(5), rush down pressure device 14 and open, vacuum chamber 11 is communicated with atmosphere, vacuum chamber 11 returns to atmospheric pressure state;
(6), rush down pressure device 14 and close, tire 4 rotations are carried out the detection of this sector to the second sector;
(7), repeat (3) to (6) step and finish the one-time detection of upper sidewall.
Secondly, the tyre surface of tire 4 is detected, namely after having detected the upper sidewall, control inside and outside probe and reorientate and repeat testing process that above-mentioned (3) to (6) go on foot to finish the detection of tyre surface.
At last, use fork truck that tire 4 is taken out after, reorientate after 180 ° of its upsets, carry out again the detection of lower sidewall, particularly with reference to step (1) to (7).
Claims (10)
1. a laser speckle detection device for off-the-road tire includes the vacuum plant (1) that forms the detection of negative pressure environment, and is arranged on vacuum plant (1) inner proving installation (2) and whirligig (3),
It is characterized in that: proving installation (2) is used for detecting respectively in detected tire (4) medial and lateral, and it has interior probe (26) and the outer probe (28) that can move along the vertical and horizontal directions and locate;
Whirligig (3) is used for carrying and drives detected tire (4) synchronously being rotated.
2. laser speckle detection device for off-the-road tire according to claim 1, it is characterized in that: described proving installation (2) includes,
Be used for carrying out in detected tire (4) inboard the phase place process of taking pictures, probe (26) vertically carries out the interior probe rotatable mechaninism (25) of rotation adjusting in the control;
Be used for outside detected tire (4), carrying out the phase place process of taking pictures, the outer probe rotatable mechaninism (29) that rotation is regulated is vertically carried out in outer pop one's head in (28) of control, and the outer probe of control (28) vertically carries out the highly vertical micro-adjusting mechanism of outer probe (27) of adjusting.
3. laser speckle detection device for off-the-road tire according to claim 1 and 2, it is characterized in that: described whirligig (3) includes,
Surface bears is detected tire thereon, (4) turret, (38), turret, (38) be connected in and pass through clutch shaft bearing, (33) be sheathed on rotating shaft, (32) driven gear on, (37), driven gear, (37) driving gear by being connected with a joggle, (36) by motor, (35) drive rotation, rotating shaft, (32) be installed on base, (31) center, base, (31) bottom is provided with bears turret, (38) the second bearing of vertical acting force, (34)
On base (31), be provided with equably several and be used for auxiliary the 3rd bearing (39) that bears turret (38) level and vertical acting force.
4. laser speckle detection device for off-the-road tire according to claim 1 and 2 is characterized in that: described vacuum plant (1) includes vacuum chamber (11), dress tire door (13) and pressure relief device (14),
Proving installation (2) and whirligig (3) are installed in the vacuum chamber (11), and vacuum chamber (11) is connected in vacuum pump (12).
5. laser speckle detection device for off-the-road tire according to claim 2, it is characterized in that: described proving installation (2) includes,
One frame (21), be provided with simultaneously in frame (21) pop one's head in (26) in driving, outer probe (28) is along the elevating mechanism (22) of vertical movement, be provided with interior probe horicontal motion mechanism (23) and outer probe horicontal motion mechanism (24) at elevating mechanism (22)
Probe rotatable mechaninism (25) in interior probe horicontal motion mechanism (23) is installed,
The outer probe of the upper installation of the horizontal mobile mechanism (24) of popping one's head in outside vertical micro-adjusting mechanism (27), probe rotatable mechaninism (29) outside the vertical micro-adjusting mechanism (27) of popping one's head in is outside upward installed.
6. based on the detection method of using the laser speckle detection device for off-the-road tire described in the claims 1-5, carry out in the handoff procedure of normal pressure and negative pressure of vacuum environment in vacuum plant (1) inside, adopting the laser means of taking pictures to rebuild the light path phase place that causes before and after detected tire (4) deformation changes, possibility and the particular location of phase image to determine that detected tire (4) inherent vice exists by before and after the deformation of contrast common sector is characterized in that:
In testing process, detected tire (4) is carried on the whirligig (3) and with whirligig (3) and synchronously is rotated;
Interior probe (26) in the proving installation (2), outer probe (28) detect for inside and outside sidewall and the tyre surface of detected tire (4) respectively.
7. off-the-road tyre laser speckle detection method according to claim 6, it is characterized in that: in testing process, include, in the control probe (26) inboard at detected tire (4), vertically carry out the step that the photo angle rotation is regulated.
8. according to claim 6 or 7 described off-the-road tyre laser speckle detection methods, it is characterized in that: include in testing process, the outer probe of control (28) is in detected tire (4) outside, vertically position the step of highly regulating with photo angle rotation adjusting.
9. off-the-road tyre laser speckle detection method according to claim 8, it is characterized in that: in testing process, include, under detected tire (4) original state, adopt 2 probes for the medial and lateral on the sidewall that does not contact with whirligig (3), and the 1st testing process that detects respectively of tyre surface;
After will being detected 180 ° of tire (4) flip verticals, the 2nd testing process that detects for the medial and lateral on opposite side sidewall.
10. off-the-road tyre laser speckle detection method according to claim 9, it is characterized in that: in the 1st testing process and the 2nd testing process, respectively for the medial and lateral on two side direction sidewalls, and tyre surface in turn carry out with reference to state take pictures, vacuumize, stress state is taken pictures, tire rotation, with reference to state is taken pictures, release, stress state are taken pictures detecting step;
When detecting each time, the medial and lateral of detected tire (4) are divided into different sectors and detect.
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