Tire defect detection equipment based on machine vision technology

Abstract

The invention relates to the technical field of tire detection, and discloses tire defect detection equipment based on a machine vision technology, the tire defect detection equipment comprises a base, the top side of the base is fixedly connected with an F-shaped supporting frame, the rear end of the F-shaped supporting frame movably penetrates through a rotating assembly, and the right end of the rotating assembly penetrates through and is movably connected with a positioning mechanism; a rotating assembly is arranged at the front end, close to the right end, of the top side of the base, and the top end of the rotating assembly is rotationally connected with a lifting electric cylinder set and a transverse stretching assembly. Through the fusion of multi-dimensional structural design and machine vision technology, efficient and accurate detection of tire defects is realized, a multi-dimensional vision detection framework adopts layered layout of an in-tire detection assembly and a tire crown detection assembly, an in-tire acquisition camera of the in-tire detection assembly is arranged around an in-tire supporting shaft, 360-degree shooting can be carried out on the inner wall and the internal structure of a tire, and the detection accuracy is improved. Tire crown collection cameras are distributed on the inner side of an annular cover of the tire crown detection assembly in an array mode, all-directional scanning of the surface of the tire crown is achieved, and the defect recognition rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of tire detection, and in particular to a tire defect detection device based on machine vision technology. Background Art

[0002] In the tire manufacturing industry, defect detection is a key link in ensuring product quality and driving safety.

[0003] Most traditional tire inspection equipment can only perform planar inspections on the tire crown surface. If it relies on manual visual inspection or traditional camera scanning, it is difficult to detect internal defects such as cracks on the inner wall of the tire and cord misalignment, resulting in an increase in the rate of missed detection of internal hidden dangers; existing equipment mostly uses manual loading and mechanical positioning, and operators need to frequently manually adjust the clamping device, which increases the time consumption of a single inspection and the positioning error, making it difficult to meet the high-speed operation requirements of modern production lines; traditional rigid clamping mechanisms cannot automatically adjust according to tire size, and are prone to indentation damage to thin-walled tires, resulting in some qualified tires being scrapped due to clamping deformation; and the detection accuracy is insufficient, relying on a single fixed-angle camera to capture images, there are detection blind spots, and the recognition rate of minor defects is insufficient. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems of traditional tire inspection equipment such as single detection dimension, low degree of automation, poor clamping adaptability and insufficient detection accuracy. The present invention provides a tire defect detection device based on machine vision technology.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A tire defect detection device based on machine vision technology includes a base, the top side of the base is fixedly connected to an F-shaped support frame, the rear end of the F-shaped support frame is movably penetrated by a rotating assembly, the right end of the rotating assembly penetrates and is movably connected to a positioning mechanism, a rotating assembly is provided at the right end of the top front end of the base, the top of the rotating assembly is rotatably connected to a lifting cylinder group and a transverse stretching assembly, the lifting cylinder group is arranged in the vertical direction of the two side ends of the transverse stretching assembly, the transverse stretching assembly is arranged at the upper and lower lateral positions of the lifting cylinder group, the rear end of the transverse stretching assembly located at the top is provided with a clamping assembly, the clamping assembly is located directly above the positioning mechanism, a control panel is provided on the front side of the rotating assembly, the positioning mechanism includes a tire support assembly, an in-tire detection assembly, a crown detection assembly and a detection support frame, the bottom end of the in-tire detection assembly is fixedly and rotatably connected to the top axis of the detection support frame, the inner end of the tire support assembly is arranged at the bottom end of the in-tire detection assembly, and the inner end of the bottom end of the crown detection assembly is rotatably arranged at the bottom end of the tire support assembly.

[0006] Furthermore, the rotating assembly includes a rotating motor 1, a main rotating wheel, a passive wheel and a conveyor belt. The bottom end of the rotating motor 1 passes through the bottom of the side wall of the base, and the upper and lower ends of the axis of the main rotating wheel pass through and are rotatably connected to the upper and lower ends of the rear end of the F-shaped support frame. When the rotating motor 1 in the rotating assembly is started, its output end drives the main rotating wheel to rotate.

[0007] Furthermore, the top output end of the rotating motor is rotatably connected to the bottom axis of the main wheel, and the inner side of the conveyor belt is connected to the outer side of the main wheel and the passive wheel, and the power is transmitted to the passive wheel through the conveyor belt to form a closed-loop transmission system, and the conveyor belt continues to operate.

[0008] Furthermore, the bottom end of the detection support frame is fixedly connected to the top side of the base, and the axis of the rotating assembly passes through and is rotationally connected to the center of the detection support frame. When the tire is transferred to the positioning mechanism, the detection support frame provides stable support for the entire positioning mechanism.

[0009] Furthermore, the tire support assembly includes a connecting rod, a tire support shaft and a tire trailer. The top end of the connecting rod is fixedly connected to the bottom axis of the tire support shaft, and the inner end of the tire trailer is fixedly connected to the outer periphery of the tire support shaft. The tire trailer in the tire support assembly supports the tire, and the tire support shaft is fixed by the connecting rod to ensure that the tire is in a stable placement state.

[0010] Furthermore, the in-tire detection component includes an in-tire support shaft and an in-tire acquisition camera. The in-tire acquisition camera is arranged around the outer periphery of the in-tire support shaft, and a circle of the in-tire acquisition cameras is also arranged around the top oblique side of the in-tire support shaft. The in-tire support shaft of the in-tire detection component drives the in-tire acquisition cameras around and on the top oblique side to prepare for shooting the inner wall of the tire, the cord layer and other structures from different angles inside the tire.

[0011] Furthermore, the crown detection assembly includes an axle frame, an extension frame, an annular cover and a crown acquisition camera. The inner end of the extension frame is arranged around the outer periphery of the axle frame, and the inner center of the bottom end of the annular cover is fixedly connected to the outer end of the extension frame. The crown acquisition camera array is arranged on the inner wall of the annular cover. The axle frame is connected to the annular cover through the extension frame. The crown acquisition cameras distributed in an array on the inner wall of the annular cover are aimed at the tire crown surface.

[0012] Furthermore, the rotating assembly includes a support seat and a second rotating motor. The bottom side of the support seat is fixedly connected to the top side of the base. The second rotating motor is arranged through the inner side of the middle part of the support seat. The top output end of the second rotating motor is rotatably connected to the bottom of the square frame composed of the lifting electric cylinder group and the transverse stretching assembly. The second rotating motor of the rotating assembly is installed in the support seat and drives the square frame composed of the lifting electric cylinder group and the transverse stretching assembly to rotate after starting.

[0013] Furthermore, the lateral stretching assembly includes a bracket and an adjusting electric cylinder. The outer end of the bracket is fixedly connected to the outer end of the clamping assembly, and the inner end of the bracket is arranged at the outer end of the adjusting electric cylinder. After the wrapping ring contacts the tire, the pressure sensor monitors the clamping force in real time, and the adjusting electric cylinder automatically adjusts the clamping force according to the pressure feedback to ensure that the tire is firmly clamped and will not be damaged due to excessive pressure.

[0014] Furthermore, the clamping assembly includes a clamping arm, a wrapping ring and a pressure sensor. The clamping arm is provided with two groups, and the two inner ends of the clamping arm are respectively fixedly connected to the two side ends of the transverse stretching assembly. The wrapping ring is provided with two groups of semicircles, and the outer axis of the two groups of semicircular wrapping rings are respectively fixedly connected to the inner sides of the outer ends of the two groups of clamping arms. The pressure sensor is arranged at the inner bottom end of the wrapping ring. The adjusting electric cylinder of the transverse stretching assembly pushes the bracket, driving the clamping arm to move laterally, so that the two groups of wrapping rings gradually approach the tire sidewall.

[0015] Compared with the existing technology, the present invention provides a tire defect detection device based on machine vision technology, which has the following beneficial effects: 1. This tire defect detection equipment based on machine vision technology achieves efficient and accurate detection of tire defects through the integration of multi-dimensional structural design and machine vision technology. The multi-dimensional visual inspection architecture adopts a layered layout of in-tire inspection components and crown inspection components. The in-tire acquisition camera of the in-tire inspection component is arranged around the in-tire support shaft, which can take 360-degree pictures of the tire inner wall and internal structure. The crown acquisition camera is arranged in an array on the inner side of the annular cover of the crown inspection component to achieve all-round scanning of the crown surface. The combination of the two eliminates detection blind spots and improves the defect recognition rate.

[0016] 2. This tire defect detection equipment based on machine vision technology uses integrated control and automated operation to achieve unified adjustment of equipment parameters and operating status monitoring through the control panel. The dual-motor drive system of the rotating and rotating components ensures that the tire rotates according to the preset trajectory, enabling the visual inspection component to accurately capture images of various parts of the tire, improving manual inspection efficiency and accuracy, and effectively enhancing tire quality control capabilities.

[0017] 3. This tire defect detection equipment based on machine vision technology uses a flexible clamping and dynamic adjustment mechanism to drive the rotation of a square frame consisting of a lifting cylinder group and a transverse stretching assembly through a rotating assembly. In conjunction with the wrapping ring and pressure sensor of the clamping assembly, it can automatically adjust the clamping position and force according to the tire specifications. The pressure sensor provides real-time feedback on the clamping force to avoid overpressure damage to the tire. At the same time, the lifting cylinder group and the transverse stretching assembly realize three-dimensional position adjustment of the clamping assembly to adapt to tires of different sizes.

[0018] 4. This tire defect detection equipment based on machine vision technology uses a composite positioning and conveying system in which the rotating component and the positioning mechanism work together. The rotating component drives the main wheel and conveyor belt through a rotating motor to accurately convey the tire to the positioning mechanism. The detection support frame of the positioning mechanism stably supports the tire support component, tire inner and crown detection components, ensuring that the tire is fixed in position during the detection process, laying the foundation for subsequent detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional front view of the overall outer structure of the present invention is shown; Figure 2 A three-dimensional image showing the rear side of the overall outer structure of the present invention; Figure 3 A three-dimensional diagram showing the detailed structure of the rotating assembly of the present invention; Figure 4 A three-dimensional diagram showing the top of the internal structure of the positioning mechanism of the present invention; Figure 5 A three-dimensional diagram showing the detailed structure of the tire support assembly and the crown detection assembly of the present invention; Figure 6 A top three-dimensional diagram showing the structural connection relationship between the tire in-tire detection component and the tire crown detection component of the present invention; Figure 7 A top three-dimensional perspective view showing the structural connection relationship between the transverse stretching assembly and the clamping assembly of the present invention; Figure 8 The right side shows a three-dimensional perspective view of the positional relationship between the positioning mechanism, the rotating assembly and the clamping assembly of the present invention; Figure 9 A three-dimensional diagram showing the detailed structure of the in-fetal detection component of the present invention.

[0020] In the figure: 1. Base; 2. F-type support frame; 3. Rotating assembly; 31. Rotating motor 1; 32. Main rotating wheel; 33. Passive wheel; 34. Conveyor belt; 4. Positioning mechanism; 41. Tire support assembly; 411. Connecting rod; 412. Tire support shaft; 413. Tire trailer; 42. In-tire detection assembly; 421. In-tire support shaft; 422. In-tire acquisition camera; 43. Tire crown detection assembly; 431. Axle frame; 432. Extension frame; 433. Annular cover; 434. Tire crown acquisition camera; 44. Detection support frame; 5. Rotating assembly; 51. Support seat; 52. Rotating motor 2; 6. Lifting electric cylinder group; 7. Transverse stretching assembly; 71. Bracket; 72. Adjusting electric cylinder; 8. Clamping assembly; 81. Clamping arm; 82. Wrapping ring; 83. Pressure sensor; 9. Control panel. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1

[0022] like Figures 1-9 As shown, a tire defect detection equipment based on machine vision technology includes a base 1, an F-type support frame 2 is fixedly connected to the top side of the base 1, a rotating component 3 is movably passed through the rear end of the F-type support frame 2, and the right end of the rotating component 3 is passed through and movably connected to the positioning mechanism 4, a rotating component 5 is provided at the right end of the top front end of the base 1, and the top of the rotating component 5 is rotatably connected to a lifting cylinder group 6 and a transverse stretching component 7, the lifting cylinder group 6 is provided in the vertical direction of both side ends of the transverse stretching component 7, and the transverse stretching component 7 is provided in the transverse position of the upper and lower ends of the lifting cylinder group 6, a clamping component 8 is provided at the rear end of the transverse stretching component 7 at the top, and the clamping component 8 is located directly above the positioning mechanism 4, and a control panel 9 is provided on the front side of the rotating component 5.

[0023] like Figure 3As shown, the rotating assembly 3 includes a rotating motor 31, a main rotating wheel 32, a driven wheel 33 and a conveyor belt 34. The bottom end of the rotating motor 31 passes through the bottom of the side wall of the base 1, and the upper and lower ends of the axis of the main rotating wheel 32 pass through and are rotatably connected to the upper and lower ends of the rear end of the F-shaped support frame 2. The top output end of the rotating motor 31 is rotatably connected to the bottom axis of the main rotating wheel 32. The inner side of the conveyor belt 34 is connected to the outer sides of the main rotating wheel 32 and the driven wheel 33. When the rotating motor 31 in the rotating assembly 3 is started, its output end drives the main rotating wheel 32 to rotate, and the power is transmitted to the driven wheel 33 through the conveyor belt 34, forming a closed-loop transmission system. The conveyor belt 34 continues to operate to transport the tire from one end of the equipment to the positioning mechanism 4. like Figure 4-Figure 6 、 Figure 8 and Figure 9 As shown, the positioning mechanism 4 includes a tire support assembly 41, an in-tire detection assembly 42, a crown detection assembly 43 and a detection support frame 44. The bottom end of the in-tire detection assembly 42 is fixedly and rotatably connected to the top axis of the detection support frame 44. The inner end of the tire support assembly 41 is arranged at the bottom end of the in-tire detection assembly 42. The inner end of the bottom end of the crown detection assembly 43 is rotatably arranged at the bottom end of the tire support assembly 41. The bottom end of the detection support frame 44 is fixedly connected to the top side of the base 1. The axis of the rotating assembly 3 passes through and is rotatably connected to the center of the detection support frame 44. The tire support assembly 41 includes a connecting rod 411, a tire support shaft 412, and a tire bracket 413. The top end of the connecting rod 411 is fixedly connected to the bottom axis of the tire support shaft 412, and the inner end of the tire bracket 413 is fixedly connected to the outer periphery of the tire support shaft 412. When the tire is transferred to the positioning mechanism 4, the detection support frame 44 provides stable support for the entire positioning mechanism. The tire bracket 413 in the tire support assembly 41 receives the tire, and the tire support shaft 412 is fixed by the connecting rod 411 to ensure that the tire is in a stable position. The tire detection assembly 42 includes a tire support shaft 421 and a tire acquisition camera 422. The tire acquisition camera 422 is arranged around the outer periphery of the tire support shaft 421. A circle of tire acquisition cameras 422 is also arranged around the top oblique side of the tire support shaft 421. The tire support shaft 421 of the tire detection assembly 42 drives the tire acquisition cameras 422 around and on the top oblique side to prepare to photograph the tire inner wall, tire cord layer and other structures from different angles inside the tire. Example 2

[0024] The crown detection assembly 43 includes an axle frame 431, an extension frame 432, an annular cover 433, and a crown acquisition camera 434. The inner end of the extension frame 432 is arranged around the outer periphery of the axle frame 431. The inner center of the bottom end of the annular cover 433 is fixedly connected to the outer end of the extension frame 432. The crown acquisition cameras 434 are arranged in an array on the inner side wall of the annular cover 433. The axle frame 431 is connected to the annular cover 433 through the extension frame 432. The crown acquisition cameras 434 are arranged in an array on the inner side wall of the annular cover 433 and are aimed at the tire crown surface. like Figure 8 As shown, the rotating assembly 5 includes a support base 51 and a second rotating motor 52. The bottom side of the support base 51 is fixedly connected to the top side of the base 1. The second rotating motor 52 is arranged through the middle inner side of the support base 51. The top output end of the second rotating motor 52 is rotatably connected to the bottom of the square frame composed of the lifting cylinder group 6 and the transverse stretching assembly 7. The second rotating motor 52 of the rotating assembly 5 is installed in the support base 51. After starting, it drives the square frame composed of the lifting cylinder group 6 and the transverse stretching assembly 7 to rotate; this rotation causes the clamping assembly 8 to rotate to the top of the tire, preparing for clamping the tire; like Figure 7 As shown, the transverse stretching component 7 includes a bracket 71 and an adjusting electric cylinder 72. The outer end of the bracket 71 is fixedly connected to the outer end of the clamping component 8, and the inner end of the bracket 71 is arranged at the outer end of the adjusting electric cylinder 72. The clamping component 8 includes a clamping arm 81, a wrapping ring 82 and a pressure sensor 83. The clamping arm 81 is provided with two groups, and the two groups of inner ends of the clamping arm 81 are respectively fixedly connected to the two side ends of the transverse stretching component 7. The wrapping ring 82 is provided with two groups of semicircles, and the outer axis centers of the two groups of semicircular wrapping rings 82 are respectively fixedly connected to the inner sides of the outer ends of the two groups of clamping arms 81. The pressure sensor 83 is arranged at the inner bottom end of the wrapping ring 82. The adjusting electric cylinder 72 of the transverse stretching component 7 pushes the bracket 71, driving the clamping arm 81 to move laterally, so that the two groups of wrapping rings 82 gradually approach the tire sidewall; when the wrapping ring 82 contacts the tire, the pressure sensor 83 monitors the clamping force in real time, and the adjusting electric cylinder 72 automatically adjusts the clamping force according to pressure feedback.

[0025] Working principle: Figures 1-9 As shown, the rotating assembly 3 is driven: the rotating motor 31 in the rotating assembly 3 is started, and its output end drives the main rotating wheel 32 to rotate, and the power is transmitted to the passive wheel 33 through the conveyor belt 34, forming a closed-loop transmission system. The conveyor belt 34 continuously runs, transporting the tire from one end of the equipment to the positioning mechanism 4, providing a material transmission basis for subsequent testing; Positioning mechanism 4 receives the tire: When the tire is transferred to the positioning mechanism 4, the detection support frame 44 provides stable support for the entire positioning mechanism; the tire bracket 413 in the tire support assembly 41 receives the tire, and the tire support shaft 412 is fixed by the connecting rod 411 to ensure that the tire is in a stable position; at this time, the axis of the rotating assembly 3 passes through the center of the detection support frame 44, providing a power transmission path for subsequent tire rotation detection; The in-tire inspection assembly 42 is in place: The in-tire support shaft 421 of the in-tire inspection assembly 42 drives the in-tire acquisition cameras 422 on the surrounding and top oblique sides to prepare to photograph the tire inner wall, tire cord layer and other structures from different angles inside the tire. The multi-angle layout of the in-tire acquisition cameras 422 can fully capture possible defects such as bubbles and cord breaks inside the tire; Adjusting the crown inspection assembly 43: In the crown inspection assembly 43, the shaft frame 431 is connected to the annular cover 433 via the extension frame 432. The crown acquisition cameras 434 arranged in an array on the inner sidewall of the annular cover 433 are aimed at the surface of the tire crown. The crown acquisition cameras 434 can capture images of defects such as tread wear, missing glue, and embedded foreign matter in the crown. Rotating assembly linkage: The rotating motor 2 52 of the rotating assembly 5 is installed in the support seat 51. After starting, it drives the square frame composed of the lifting cylinder group 6 and the transverse stretching assembly 7 to rotate; this rotation causes the clamping assembly 8 to rotate to the top of the tire, preparing to clamp the tire; Clamping assembly action: The adjusting electric cylinder 72 of the transverse stretching assembly 7 pushes the bracket 71, driving the clamping arm 81 to move laterally, so that the two sets of wrapping rings 82 gradually approach the tire sidewall; when the wrapping rings 82 contact the tire, the pressure sensor 83 monitors the clamping force in real time, and the adjusting electric cylinder 72 automatically adjusts the clamping force based on the pressure feedback, ensuring that the tire is firmly clamped and not damaged by excessive pressure; at the same time, the lifting electric cylinder group 6 can adjust the height of the clamping assembly 8 in the vertical direction to adapt to tires of different specifications; Coordinated rotation of multiple components: Rotating motor 1 31 of rotating component 3 continuously operates, driving the tire support shaft 421 and shaft frame 431 in positioning mechanism 4 to rotate synchronously through main rotating wheel 32, conveyor belt 34 and driven wheel 33. At the same time, rotating motor 2 52 of rotating component 5 can also drive clamping component 8 and tire to make additional angle adjustments according to detection requirements, realizing multi-dimensional rotation of the tire; Image acquisition coverage: During tire rotation, the tire interior acquisition camera 422 continuously shoots 360 degrees inside the tire to obtain images of the tire inner wall and internal structure; the crown acquisition camera 434 performs a full-scale scan of the crown surface to capture details of each part of the crown; multi-angle and multi-directional image acquisition ensures that any defects on the tire surface and inside can be clearly recorded, ensuring that the inspection process is efficient and accurate.

Claims

1. A tire defect detection device based on machine vision technology, comprising a base (1), characterized in that: The top side of the base (1) is fixedly connected to an F-shaped support frame (2), the rear end of the F-shaped support frame (2) is movably penetrated by a rotating assembly (3), the right end of the rotating assembly (3) is penetrated and movably connected to a positioning mechanism (4), a rotating assembly (5) is provided at the right end of the top front end of the base (1), the top end of the rotating assembly (5) is rotatably connected to a lifting cylinder group (6) and a transverse stretching assembly (7), the lifting cylinder group (6) is provided at the vertical direction of both side ends of the transverse stretching assembly (7), the transverse stretching assembly (7) is provided at the transverse position of the upper and lower ends of the lifting cylinder group (6), the rear end of the transverse stretching assembly (7) located at the top is provided with a clamping assembly (8), the clamping assembly (8) is located directly above the positioning mechanism (4), and a control panel (9) is provided on the front side of the rotating assembly (5); The positioning mechanism (4) comprises a tire support assembly (41), an in-tire detection assembly (42), a crown detection assembly (43) and a detection support frame (44), wherein the bottom end of the in-tire detection assembly (42) is fixedly and rotatably connected to the top axis of the detection support frame (44), the inner end of the tire support assembly (41) is arranged at the bottom end of the in-tire detection assembly (42), and the inner end of the bottom end of the crown detection assembly (43) is rotatably arranged at the bottom end of the tire support assembly (41).

2. The tire defect detection device based on machine vision technology according to claim 1, characterized in that: The rotating assembly (3) includes a rotating motor (31), a main rotating wheel (32), a driven wheel (33) and a conveyor belt (34). The bottom end of the rotating motor (31) passes through the bottom of the side wall of the base (1), and the upper and lower ends of the axis of the main rotating wheel (32) pass through and are rotatably connected to the upper and lower ends of the rear end of the F-shaped support frame (2).

3. The tire defect detection device based on machine vision technology according to claim 2, characterized in that: The top output end of the rotating motor (31) is rotatably connected to the bottom axis of the main rotating wheel (32), and the inner side of the conveyor belt (34) is connected to the outer sides of the main rotating wheel (32) and the passive wheel (33).

4. The tire defect detection device based on machine vision technology according to claim 1, characterized in that: The bottom end of the detection support frame (44) is fixedly connected to the top side of the base (1), and the axis of the rotating assembly (3) passes through and is rotationally connected to the center of the detection support frame (44).

5. The tire defect detection device based on machine vision technology according to claim 1, characterized in that: The tire support assembly (41) comprises a connecting rod (411), a tire support shaft (412) and a tire bracket (413), wherein the top end of the connecting rod (411) is fixedly connected to the bottom axis of the tire support shaft (412), and the inner end of the tire bracket (413) is fixedly connected to the outer periphery of the tire support shaft (412).

6. The tire defect detection device based on machine vision technology according to claim 1, characterized in that: The in-tire detection component (42) comprises an in-tire support shaft (421) and an in-tire acquisition camera (422). The in-tire acquisition camera (422) is arranged on the outer periphery of the in-tire support shaft (421), and a circle of the in-tire acquisition cameras (422) is also arranged around the top oblique side of the in-tire support shaft (421).

7. The tire defect detection device based on machine vision technology according to claim 1, characterized in that: The tire crown detection assembly (43) includes an axle frame (431), an extension frame (432), an annular cover (433) and a tire crown acquisition camera (434), wherein the inner end of the extension frame (432) is arranged around the outer periphery of the axle frame (431), the inner center of the bottom end of the annular cover (433) is fixedly connected to the outer end of the extension frame (432), and the tire crown acquisition camera (434) array is arranged on the inner side wall of the annular cover (433).

8. The tire defect detection device based on machine vision technology according to claim 1, characterized in that: The rotating assembly (5) includes a support seat (51) and a second rotating motor (52), wherein the bottom side of the support seat (51) is fixedly connected to the top side of the base (1), and the second rotating motor (52) is arranged through the inner side of the middle part of the support seat (51), and the top output end of the second rotating motor (52) is rotatably connected to the bottom of the square frame composed of the lifting cylinder group (6) and the transverse stretching assembly (7).

9. The tire defect detection device based on machine vision technology according to claim 1, characterized in that: The transverse stretching assembly (7) comprises a bracket (71) and an adjusting electric cylinder (72), wherein the outer end of the bracket (71) is fixedly connected to the outer end of the clamping assembly (8), and the inner end of the bracket (71) is arranged at the outer end of the adjusting electric cylinder (72).

10. The tire defect detection device based on machine vision technology according to claim 1, characterized in that: The clamping assembly (8) includes a clamping arm (81), a wrapping ring (82) and a pressure sensor (83). The clamping arm (81) is provided with two groups, and the inner ends of the two groups of the clamping arm (81) are respectively fixedly connected to the two side ends of the transverse stretching assembly (7). The wrapping ring (82) is provided with two groups of semicircles, and the outer axis centers of the two groups of semicircular wrapping rings (82) are respectively fixedly connected to the inner sides of the outer ends of the two groups of the clamping arms (81). The pressure sensor (83) is provided at the inner bottom end of the wrapping ring (82).

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