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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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 invention relates to a device and a method for carrying out laser speckle flaw detection on a tire in a rotating state by adopting an inner laser probe and an outer laser probe, belonging to the field of rubber machinery and industrial automation.
Background
Along with the rapid development of the industries such as domestic mining, constructional engineering and the like in recent years, higher requirements are put forward on the use quality of large engineering machinery tires, and the engineering machinery tires have higher wear resistance, puncture resistance and high overload performance aiming at the limitations of application site environments, overweight loads and road surface conditions, so that the inspection of defects in the tires (such as quality defects of internal bubbles, delamination and the like) is particularly important.
The conventional inspection method for the engineering machinery tires in China carries out sampling inspection through destructive tests, but the inspection method can only roughly estimate the qualified rate of the manufacturing quality, but cannot ensure that all factory tires reach the qualified standard, and the defect of internal bubbles cannot be detected through the conventional inspection means. The existence of the internal air bubbles can directly cause the tyre burst of the engineering machinery tyre under the heavy load or severe condition, so that a driver cannot control the direction of the automobile and a serious accident of vehicle damage and personal death is easy to occur.
There is another prior art inspection method disclosed in the prior patent application No. 200410077522.8 entitled laser speckle tire nondestructive inspection apparatus, wherein a laser speckle inspection head capable of vertical, horizontal and rotational movement is connected to an inspection chamber provided with a vacuum device through an inspection head movement mechanism. Under the detecting head, there is an automatic tyre positioning device for bearing and positioning tyre. The detection head movement mechanism comprises a detection head connecting rod connected with the detection head, and a horizontal movement mechanism, a vertical movement mechanism and a rotary movement mechanism which are connected with the connecting rod. The rotary motion mechanism comprises a rotary driving motor, a rotary gear and a rotary connector. The automatic tire positioning device comprises a detecting head for measuring the diameter of the tire and an indoor conveying belt for bearing and moving the tire, wherein the detecting head drives the indoor conveying belt to move through a computer program after measuring the diameter of the tire, so that the tire is positioned at the center of the detection chamber.
According to the technical scheme provided by the patent, the tire is conveyed to the inside of the detection chamber and is positioned at a fixed position, and a set of driving mechanism above the tire drives the detection head to rotate along the inner side or the outer side of the tire in the circumferential direction to perform detection, so that the patent has the following defects and shortcomings:
in the case of a large off-the-road tire, the change of the internal air volume of the tire caused by the change of the external air pressure due to the large thickness of the tire hardly causes the deformation of the surface of the tire, and if the detection is only carried out on the inner side or the outer side of the tire, the defect of a deep layer in the tire is difficult to detect.
The inner diameter and the outer diameter of the engineering machinery tire are large, when the laser probe rotates, a large rotating radius is needed, and when the rotation stops, large vibration is easily caused to influence the detection efficiency and the detection effect.
Adopt a laser detection head to rotate along circumference and shoot, its level, vertical or swing angle's regulation receives great restriction, is unfavorable for image definition and detection efficiency's improvement.
Disclosure of Invention
The invention provides a laser speckle detection device and a laser speckle detection method for an engineering machinery tire, aiming at solving the defects and shortcomings in the prior art, during the switching process of normal pressure and vacuum negative pressure environments in sequence, the tire is horizontally placed and driven to rotate, 2 probes are utilized to respectively aim at inner and outer side walls and a tire surface for laser photographing and imaging, so that the phase change of an optical path caused before and after the deformation of the tire is reconstructed, and the possibility and the specific position of the existence of the internal defect are accurately detected.
The invention aims to detect the phase change of an optical path caused by the deformation of the surface of the tire caused by internal bubbles or delamination by using a laser probe based on the deformation of the outer surface of the tire caused by an external negative pressure environment, thereby determining and accurately positioning internal defects, measuring sizes and the like, and improving and optimizing the accuracy of internal flaw detection of the engineering machinery tire.
Another object of the present invention is to overcome the influence of the strength of the defect caused by the internal structure of the tire on the detection (the closer the defect is to the surface of the tire, the more easily the deformation of the corresponding surface of the tire is caused, and the stronger the strength between the defect and the surface of the tire, the more difficult the deformation of the defect in different states is reflected), and detect the defect on the inner side or the outer side of the tire respectively, so as to improve the detection accuracy.
The invention also aims to control and reduce the defects of the rotation detection of the single laser probe so as to improve the quality of the detection operation, thereby being suitable for the detection requirements of large tires with different external dimensions and section width specifications.
In order to achieve the above purpose, the laser speckle detection device for the engineering machinery tire mainly comprises:
the vacuum device forms a negative pressure detection environment, and the testing device and the rotating device are arranged in the vacuum device. The difference from the prior art is that,
the testing device is used for respectively taking phase pictures of the inner side and the outer side of a tested tire, and is provided with an inner probe and an outer probe which can move and be positioned in the vertical direction and the horizontal direction, namely 2 laser probes which are independently controlled and operated.
The rotating device is used for bearing and driving the detected tire to synchronously rotate, namely the detected tire rotates together with the rotating device in the detection process.
Based on the basic improvement scheme, the inner and outer 2 laser probes are adopted to respectively and independently surround the inner side or the outer side of the detected tire for detection, so that the influence of the defect position on the detection accuracy can be effectively overcome.
The detection result formed by the inner laser probe and the outer laser probe can obviously improve the detection accuracy, and the tire in a rotating state cannot have a detection blind area.
In order to further improve the definition of the images shot by the tires and avoid dead zones, the following improvement scheme can be adopted:
the testing device comprises an inner probe swinging mechanism for controlling the inner probe to swing and adjust along the vertical direction in the phase photographing process of the inner side of the tested tire.
The outer probe swinging mechanism is used for controlling the outer probe to swing and adjust along the vertical direction in the phase photographing process of the outer side of the detected tire, and the outer probe vertical fine adjustment mechanism is used for controlling the outer probe to adjust the height along the vertical direction.
The rotating device is further improved and refined by the scheme that the rotating device is provided with a rotating frame for bearing the tested tire on the upper surface, the rotating frame is connected with a driven gear which is sleeved on a rotating shaft through a bearing sleeve, and the driven gear is driven to rotate by a motor through a driving gear which is meshed and connected.
The pivot is installed in the center of base, and the bottom of base is provided with the bearing that bears the vertical effort of rotating turret, is provided with the bearing that the several is used for the supplementary rotating turret level and vertical effort of bearing uniformly on the base.
The supplementary modification scheme for the vacuum device is that the vacuum device comprises a vacuum chamber, a tire installing door and a pressure relief device. Wherein, testing arrangement and rotary device install in the vacuum chamber, and the vacuum chamber is connected to the vacuum pump.
In order to improve the swing precision and the control flexibility of the inner and the outer 2 laser probes on the horizontal, the vertical and the photographing angles, the following characteristic refining testing device can be adopted. In particular, the amount of the solvent to be used,
the testing device comprises a rack, wherein a lifting mechanism which simultaneously drives the inner probe and the outer probe to move along the vertical direction is arranged on the rack, and a horizontal movement mechanism of the inner probe and a horizontal movement mechanism of the outer probe are arranged on the lifting mechanism.
And an inner probe swinging mechanism is arranged on the inner probe horizontal movement mechanism.
An outer probe vertical fine adjustment mechanism is installed on the outer probe horizontal moving mechanism, and an outer probe swinging mechanism is installed on the outer probe vertical fine adjustment mechanism.
The invention provides an improved scheme of the laser speckle detection device for the engineering machinery tire.
The laser speckle detection method for the engineering machinery tire can be realized based on the detection device, and comprises the following steps:
in the process of switching between the normal pressure environment and the vacuum negative pressure environment in the vacuum device, the laser speckle technology is adopted to reconstruct the phase change of the light path caused before and after the deformation of the detected tire, and the possibility and the specific position of the internal defect of the detected tire are determined by comparing the phase images before and after the deformation of the same sector.
Different from the existing detection method, in the detection process, the detected tire is carried on the rotating device and rotates synchronously with the rotating device.
An inner probe and an outer probe in the testing device respectively detect the inner side wall, the outer side wall and the tread of the detected tire.
The further improvement and refinement proposal is that the detection process comprises the step of controlling the inner probe to carry out the swinging and rotation adjustment of the photographing angle along the vertical direction at the inner side of the detected tire.
The detection process also can adopt the improvement that the detection process comprises the steps of controlling the outer probe to carry out positioning height adjustment and photographing angle swing adjustment along the vertical direction on the outer side of the detected tire.
In order to optimize the precision and controllability of the 2 laser probes for photographing and imaging different sectors of the tire in a rotating state, the detection process comprises a 1 st detection process of photographing and imaging the inner side upper sidewall and the tire tread respectively by adopting the 2 probes in an initial state of the tire to be detected,
and 2 nd detection flow for photographing and imaging the remaining inner side wall and the remaining outer side lower side wall after vertically turning the detected tire by 180 degrees.
In the more optimized implementation mode, in the 1 st detection process and the 2 nd detection process, the detection steps of photographing in a reference state, vacuumizing, photographing in a loading state, rotating a tire, photographing in the reference state, releasing pressure and photographing in the loading state are sequentially carried out respectively;
in each photographing imaging, the inner side and the outer side of the detected tire are divided into different sectors to realize the detection of the whole tire.
The essence of the detection method of the present invention is to take a photograph of the reference state, change the pressure in the test chamber, and take a photograph of the loading state in sequence to complete the detection of each sector of the tire.
The detection principle is that negative pressure is applied to the external environment of the tire, so that internal air bubbles or delamination forms deformation on the outer surface of the tire due to external pressure change, the light path phase change caused before and after the tire deformation is reconstructed by adopting a laser interference principle and a shear photography mode, and the size and the position of the tire are determined.
In summary, the laser speckle detection device and method for the off-the-road tire of the invention have the following advantages and beneficial effects:
1. the improvement of the existing laser speckle detection method is realized, and the omnibearing detection is implemented on the tire side, the tire shoulder and the tire tread through the rotating motion of the tire and the horizontal, vertical and swinging motion of 2 laser probes, so that the image is clearer and more stable, and the detection accuracy is effectively improved;
2. the method can be suitable for the current situation that the side wall and the tread of the engineering machinery tire are thick, the deformation of the inner air bubbles caused by the inner side and the outer side has larger difference, and the detection of the inner side and the outer side of the tire can be effectively ensured by adopting the mode that the outer probe and the inner probe respectively detect the inner side and the outer side of the tire;
3. the occupied space of the testing device and the rotating device can be optimized and reduced, so that the detection and processing cost is effectively saved;
4. the method can meet the requirements of large-scale tire detection of different external dimensions and section width specifications;
drawings
The invention will now be further described with reference to the accompanying drawings;
FIG. 1 is a schematic structural diagram of the laser speckle detection device;
FIG. 2 is a schematic structural diagram of the test apparatus;
FIG. 3 is a schematic view of the structure of the rotating device;
FIG. 4 is a schematic structural view of the vacuum apparatus;
FIG. 5 is a schematic diagram of the positioning and photographing of 2 laser probes in the detection process;
as shown in fig. 1 to 5, the vacuum apparatus 1, the testing apparatus 2, the rotating apparatus 3, and the tire 4;
a vacuum chamber 11, a vacuum pump 12, a tire installing door 13 and an automatic pressure relief mechanism 14.
The device comprises a frame 21, an upper frame 211, a lifting mechanism 22, a motor 221, a ball screw 222, a linear guide rail 223, a nut 224, a slide block 225 and a lifting frame 226;
the device comprises an inner probe horizontal movement mechanism 23, a linear guide rail 231, a synchronous belt pulley 232, a motor 233, a synchronous belt 234, a guide wheel 235, a pressing block 236, a toothed pressing plate 237 and an inner probe horizontal movement frame 238;
the outer probe horizontal movement mechanism 24, the motor 242, the synchronous belt 243, the guide wheel 244, the pressing block 245, the toothed pressing plate 246 and the outer probe horizontal movement frame 247;
the probe swinging mechanism 25, the motor 251, the driving synchronous pulley 252, the synchronous belt 253, the driven synchronous pulley 254, the swinging shaft 255 and the fixed block 256;
the device comprises an inner probe 26, an outer probe vertical fine adjustment mechanism 27, a driving synchronous pulley 271, a motor 272, a linear guide rail 273, a synchronous belt 274, a pressing block 275, a toothed pressing plate 276, a driven synchronous pulley 277 and an outer probe vertical sliding frame 278;
the device comprises an outer probe 28, an outer probe swinging mechanism 29, a motor 291, a driving synchronous pulley 292, a synchronous belt 293, a driven synchronous pulley 294, a swinging rotating shaft 295 and a fixed block 296;
the device comprises a base 31, a rotating shaft 32, a first bearing 33, a second bearing 34, a motor 35, a driving gear 36, a driven gear 37, a rotating frame 38 and a third bearing 39.
In fig. 5, point A, B, C is the adjustment and photographing position of the inner probe 26 inside the tire 4, and point D, E, F, G is the adjustment and photographing position of the outer probe 28 outside the tire 4.
Detailed Description
Embodiment 1, as shown in fig. 1 to 5, the laser speckle detection device for a tire of a construction machine mainly includes a vacuum device 1 forming a negative pressure detection environment,
a testing device 2 and a rotating device 3 arranged inside the vacuum device 1. Wherein,
the test apparatus 2 is used for taking phase photographs of the inside and outside of the tire 4 to be tested, respectively, and has an inner probe 26 and an outer probe 28 which are movable and positionable in vertical and horizontal directions.
The rotating device 3 is used for carrying and driving the tested tire 4 to synchronously rotate.
The vacuum device 1 is formed by connecting and combining a vacuum chamber 11 and a vacuum pump 12, and the vacuum chamber 11 adopts a steel frame structure. The vacuum chamber 11 is also provided with a tire installing door 13 and 2 automatic pressure relief devices 14, and the on-off operation between the vacuum chamber 11 and the vacuum pump 12 can be controlled through 1 control valve.
The design pressure of the vacuum chamber 11 is-0.04 MPa, the design temperature is 50 ℃, and the maximum negative pressure of the vacuum pump 12 is-0.04 MPa.
The testing device 2 is provided with an integral frame 21, a lifting mechanism 22 for driving the laser probe to do lifting motion is arranged on the frame 21, and an inner probe horizontal motion mechanism 23 and an outer probe horizontal motion mechanism 24 are fixed on the lifting mechanism 22 so as to control the horizontal motion of the 2 laser probes.
An inner probe swinging mechanism 25 is provided on the inner probe horizontal movement mechanism 23 to realize swinging movement of the inner probe 26.
An outer probe vertical fine adjustment mechanism 27 is further provided on the outer probe horizontal movement mechanism 24 to achieve fine adjustment of the outer probe 28 in the vertical direction. An outer probe swinging mechanism 29 is provided on the outer probe vertical fine adjustment mechanism 27 to realize swinging movement of the outer probe 28.
The lifting mechanism 22 is provided with vertical linear guide rails 223 arranged at two sides of the upper frame 211, a lifting frame 226 driven by a driving mechanism is connected between the two linear guide rails 223, the driving mechanism comprises a motor 221, a driving shaft of the motor 221 is connected with a ball screw 222 and drives the ball screw 222 to rotate, a nut 224 sleeved on the ball screw 222 is fixed on the lifting frame 226, and the lifting frame 226 is fixedly connected on a sliding block 225 of the linear guide rails 223.
Two linear guide rails 231 are fixed on the lifting frame 226, and the sliding blocks thereof are respectively connected with the inner probe horizontal moving device 23 and the outer probe horizontal moving device 24, so that the horizontal movement operation of the inner and outer 2 laser probes can be respectively realized through the following 2 driving mechanisms.
The driving mechanism of the inner probe horizontal moving device 23 of the 2 driving mechanisms comprises a motor 233 for driving a synchronous pulley 232 to rotate, the synchronous pulley 232 is connected with a guide wheel 235 through a synchronous belt 234, and is connected with an inner probe horizontal moving frame 238 through a pressing block 236 for clamping the synchronous belt 234 and a toothed pressing plate 237 to realize the horizontal movement.
In addition, the driving mechanism of the outer probe horizontal moving device 24 includes a motor 242 for driving a synchronous pulley 241 to rotate, the synchronous pulley 241 is connected to a guide pulley 244 through a synchronous belt 243, and is connected to an outer probe horizontal moving frame 247 through a pressing block 245 for clamping the synchronous belt 243 and a toothed pressing plate 246 to realize the horizontal movement thereof.
The vertical fine adjustment mechanism 27 of the outer probe is connected by two vertical linear guide rails 273 fixed on the horizontal moving frame 247 of the outer probe, and the fine adjustment operation of the outer probe 28 in the vertical direction is realized by the following driving mechanism. The driving mechanism comprises a motor 272 for driving the driving synchronous pulley 271 to rotate, the driving synchronous pulley 271 is connected with the driven synchronous pulley 277 through a synchronous belt 274, and is connected with the outer probe vertical sliding frame 278 through a pressing block 275 for clamping the synchronous belt 274 and a toothed pressing plate 276, so that the fine adjustment action operation of the outer probe 28 in the vertical direction is realized.
The inner probe swinging mechanism 25 includes a motor 251 fixed to the inner probe arm 239, and an output shaft thereof is connected to a driving synchronous pulley 252 and drives the same to rotate. The driving synchronous pulley 252 is connected to a driven synchronous pulley 254 through a synchronous belt 253, and the driven synchronous pulley 254 is sleeved on one end of the swinging shaft 255 to drive the swinging shaft 255 to rotate. The fixed block 256 connected to the inner probe arm 239 is sleeved on the middle section of the swing shaft 255, and the inner probe 26 is fixed at the other end of the swing shaft 255, so as to realize the swing motion of the inner probe 26.
The outer probe swing mechanism 29 includes a motor 291 fixed to the outer probe vertical carriage 278, and an output shaft of the motor is connected to a driving synchronous pulley 292 for driving the same to rotate. The driving timing pulley 292 is connected to a driven timing pulley 294 through a timing belt 293. The driven synchronous pulley 294 is sleeved on one end of the swing shaft 295, and drives the swing shaft 295 to rotate. The fixed block 296 connected to the vertical sliding rack 278 of the outer probe is sleeved on the middle section of the swing shaft 295, and the outer probe 28 is fixed at the other end of the swing shaft 295, so as to realize the swing action of the outer probe 28.
The rotating device 3 comprises a base 31, a rotating shaft 32 is arranged in the center of the base 31, a first bearing 33 is arranged on the rotating shaft 32, so that the rotating shaft 32 bears the main radial force of a rotating frame 38, the axial force of the rotating frame 38 is mainly borne by another pair of second bearings 34 at the bottom of the base 31, a driving gear 36 is connected to an output shaft of a motor 35, a driven gear 37 is driven to rotate through meshing, and the driven gear 37 is connected with the rotating frame 38, so that the rotating frame 38 rotates by taking the rotating shaft 3 as the center.
Based on the detection method using the laser speckle detection device for the engineering machinery tire, in the switching process of the normal pressure environment and the vacuum negative pressure environment in the vacuum device 1, the laser photographing method is adopted to reconstruct the phase change of the light path caused before and after the deformation of the detected tire 4, and the phase images before and after the deformation of the same sector are compared to determine the possibility and the specific position of the internal defect of the detected tire 4.
In the detection process, the detected tire 4 is carried on the rotating device 3 and rotates synchronously with the rotating device 3, and the inner probe 26 and the outer probe 28 in the testing device 2 respectively take a laser photograph and image of the inner sidewall, the outer sidewall and the tread of the detected tire 4. Wherein,
the detection process comprises the steps of controlling the inner probe 26 to carry out the swinging and rotating adjustment of the photographing angle along the vertical direction at the inner side of the detected tire 4; and controlling the outer probe 28 to perform positioning height adjustment and photographing angle swing adjustment along the vertical direction on the outer side of the tested tire 4.
And the more detailed division result is that the detection process comprises a 1 st detection process of taking pictures and imaging aiming at the inner side upper side wall and the tread respectively by adopting 2 probes under the initial state of the detected tire 4,
and 2 nd detection flow for photographing and imaging the residual inner side wall and the residual outer side lower side wall after vertically turning the detected tire 4 by 180 degrees.
In the 1 st detection process and the 2 nd detection process, respectively and sequentially carrying out detection steps of normal pressure photographing imaging, vacuumizing, negative pressure photographing imaging and pressure relief reduction;
at each photographing imaging, the inner and outer sides of the tire 4 to be inspected are divided into different sectors to form a plurality of sets of contrast images.
The laser speckle detection method described in this embodiment essentially completes detection of each sector of the tire by repeating normal pressure photographing, vacuum pumping, negative pressure photographing, and pressure relief reduction. Considering that the deformation of air bubbles inside the tire caused by the inner side and the outer side is likely to have large difference due to the fact that the sidewall and the tread of the engineering machinery tire are thick, the inner side and the outer side of the tire are simultaneously detected by the outer laser probe and the inner laser probe.
The specific detection process is as follows:
firstly, the upper sidewall of the tire 4 is detected, and the specific action process is as follows:
(1) placing the tire on a proper position of the rotating device 3 according to the external dimension of the tire 4, and closing a tire installing door 13 of the vacuum chamber 11;
(2) the relative movement of the inner probe 26 and the outer probe 28 into position according to the overall dimensions of the tyre 4;
(3) the inner probe 26 and the outer probe 28 start working, and a picture of the first sector is taken under normal pressure;
(4) the vacuum pump 12 pumps the vacuum chamber 11 to a set pressure, the inner probe 26 and the outer probe 28 take pictures of the sector under the negative pressure, and the two pictures are internally processed to finish the detection of the sector;
(5) the pressure relief device 14 is opened to communicate the vacuum chamber 11 with the atmosphere, and the vacuum chamber 11 is returned to the normal pressure state;
(6) the pressure relief device 14 is closed, and the tire 4 rotates to a second sector to detect the sector;
(7) and repeating the steps (3) to (6) to finish the primary detection of the upper tire side.
Secondly, the tread of the tire 4 is detected, namely after the upper tire side is detected, the inner probe and the outer probe are controlled to be repositioned, and the detection processes from the step (3) to the step (6) are repeated to finish the detection of the tread.
Finally, after taking out the tire 4 by using a forklift, the tire is turned over by 180 degrees and then repositioned, and then the lower sidewall is detected, specifically referring to the steps (1) to (7).
Claims (10)
1. A laser speckle detection device for an engineering machinery tire comprises a vacuum device (1) forming a negative pressure detection environment, a testing device (2) and a rotating device (3) arranged in the vacuum device (1),
the method is characterized in that: the testing device (2) is used for respectively testing the inner side and the outer side of a tested tire (4) and is provided with an inner probe (26) and an outer probe (28) which can move and be positioned along the vertical direction and the horizontal direction;
the rotating device (3) is used for bearing and driving the tested tire (4) to synchronously rotate.
2. The off-the-road tire laser speckle detection device as claimed in claim 1, wherein: the testing device (2) comprises a testing device,
an inner probe swinging mechanism (25) for controlling the inner probe (26) to swing and adjust along the vertical direction in the phase photographing process at the inner side of the tire (4) to be detected;
an outer probe swinging mechanism (29) for controlling the outer probe (28) to swing and adjust along the vertical direction in the phase photographing process at the outer side of the detected tire (4), and an outer probe vertical fine adjustment mechanism (27) for controlling the outer probe (28) to adjust the height along the vertical direction.
3. The off-the-road tire laser speckle detection device as claimed in claim 1 or 2, wherein: the rotating device (3) comprises a rotating shaft,
a rotating frame (38) which bears the tested tire (4) on the upper surface, the rotating frame (38) is connected with a driven gear (37) which is sleeved on the rotating shaft (32) through a first bearing (33), the driven gear (37) is driven by a motor (35) to rotate through a driving gear (36) which is connected in a meshing way, the rotating shaft (32) is arranged at the center of the base (31), a second bearing (34) which bears the vertical acting force of the rotating frame (38) is arranged at the bottom of the base (31),
and a plurality of third bearings (39) for assisting in bearing horizontal and vertical acting forces of the rotating frame (38) are uniformly arranged on the base (31).
4. The off-the-road tire laser speckle detection device as claimed in claim 1 or 2, wherein: the vacuum device (1) comprises a vacuum chamber (11), a tire installing door (13) and a pressure relief device (14),
the testing device (2) and the rotating device (3) are arranged in a vacuum chamber (11), and the vacuum chamber (11) is connected with a vacuum pump (12).
5. The off-the-road tire laser speckle detection device as claimed in claim 2, wherein: the testing device (2) comprises a testing device,
a frame (21), a lifting mechanism (22) which simultaneously drives the inner probe (26) and the outer probe (28) to move along the vertical direction is arranged on the frame (21), an inner probe horizontal movement mechanism (23) and an outer probe horizontal movement mechanism (24) are arranged on the lifting mechanism (22),
an inner probe swinging mechanism (25) is arranged on the inner probe horizontal movement mechanism (23),
an outer probe vertical fine adjustment mechanism (27) is arranged on the outer probe horizontal moving mechanism (24), and an outer probe swinging mechanism (29) is arranged on the outer probe vertical fine adjustment mechanism (27).
6. Based on the detection method using the laser speckle detection device for the engineering machinery tire as claimed in the above claims 1-5, during the switching process between the normal pressure environment and the vacuum negative pressure environment inside the vacuum device (1), the laser photographing means is used to reconstruct the phase change of the light path caused before and after the deformation of the detected tire (4), and the phase images before and after the deformation of the same sector are compared to determine the possibility and specific position of the internal defect of the detected tire (4), which is characterized in that:
in the detection process, the detected tire (4) is borne on the rotating device (3) and rotates synchronously with the rotating device (3);
an inner probe (26) and an outer probe (28) in the testing device (2) respectively detect the inner side wall, the outer side wall and the tread of the tested tire (4).
7. The off-the-road tire laser speckle detection method as claimed in claim 6, wherein: the detection process comprises the step of controlling the inner probe (26) to carry out the swinging and rotating adjustment of the photographing angle along the vertical direction at the inner side of the detected tire (4).
8. The off-the-road tire laser speckle detection method as claimed in claim 6 or 7, wherein: the detection process comprises the steps of controlling the outer probe (28) to perform positioning height adjustment and photographing angle swing adjustment along the vertical direction on the outer side of the detected tire (4).
9. The off-the-road tire laser speckle detection method as claimed in claim 8, wherein: the detection process comprises a 1 st detection flow of respectively detecting the inner side, the outer side and the tread of the tire side which is not contacted with the rotating device (3) by adopting 2 probes in the initial state of the detected tire (4);
and (2) after vertically turning the tire (4) to be detected by 180 degrees, carrying out detection aiming at the inner side and the outer side of the other side wall.
10. The off-the-road tire laser speckle detection method as claimed in claim 9, wherein: in the 1 st detection process and the 2 nd detection process, the detection steps of reference state photographing, vacuumizing, loading state photographing, tire rotation, reference state photographing, pressure relief and loading state photographing are sequentially performed respectively for the inner side and the outer side of the two lateral sidewalls and the tire tread;
at each detection, the inner side and the outer side of the detected tire (4) are divided into different sectors for detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010219549 CN102313749B (en) | 2010-06-30 | 2010-06-30 | Laser speckle detection device and method for tire of engineering machine |
Applications Claiming Priority (1)
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| WO2014097133A1 (en) * | 2012-12-21 | 2014-06-26 | Pirelli Tyre S.P.A. | Method and apparatus for controlling tyres or related semi-finished products in a production line |
| FR3009081B1 (en) * | 2013-07-25 | 2017-01-20 | Michelin & Cie | ROTATIONAL DRIVE DEVICE FOR VISUAL PNEUMATIC INSPECTION AND ASSOCIATED METHOD |
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| MX381679B (en) | 2015-12-16 | 2025-03-12 | Pirelli Tyre S P A | DEVICE AND METHOD FOR TYRE ANALYSIS. |
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| MX2021005853A (en) * | 2018-12-20 | 2021-06-15 | Pirelli | Method and station for checking tyres. |
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| CN110455807B (en) * | 2019-04-02 | 2024-09-24 | 洛阳理工学院 | DSC bubble nondestructive testing method and device for outer anticorrosive layer of anticorrosive pipeline |
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