Measuring device for detecting inner surface of pneumatic tire

Abstract

The invention belongs to the field of tire production and detection equipment, and provides a measuring device for detecting the inner surface of a pneumatic tire, the measuring device comprises a detection center frame and a displacement sensor, the detection center frame is provided with a ZR actuator, and the execution end of the ZR actuator is provided with a Y-shaped arm, an arch-shaped arm, a supporting arm, a connecting arm and a profiling arm. The perimeter contour of the profiling arm is matched with the section contour of the pneumatic tire, a combined transmission belt, a transmission gear set and a transmission hose are arranged on the profiling arm, a plurality of rolling contact assemblies are arranged on the transmission hose, and a pair of displacement sensors in contact fit with the two ends of a rolling roller is arranged in each rolling contact assembly. A transmission line used for being electrically connected with the displacement sensor is arranged in the transmission hose, and a controller is arranged at the transmission terminal of the transmission line. The device is reasonable in design, adopts contact detection, is comprehensive in detection, is favorable for reducing the probability of missing detection and error detection, is favorable for improving the detection efficiency, and is suitable for large-scale popularization.

Description

Technical Field

[0001] The invention belongs to the field of tire production and testing equipment, and in particular relates to a measuring device for detecting the inner surface of a pneumatic tire. Background Art

[0002] Pneumatic tires are made by overlapping and pasting various materials such as inner liner, carcass ply, hoop, tread, etc. The measurement of the inner surface of pneumatic tires includes many contents, such as dimensional parameter measurement, surface defect detection, rubber aging degree and balance detection, among which surface defect detection is a test item based on the bulges and cracks that may appear on the inner surface of the tire.

[0003] At present, many workshops use X-ray instruments and equipment to detect tire surface defects, such as a method and related products for marking tire defects disclosed in CN202311280513.8 and a device and method for X-ray photography of tires disclosed in CN200680043230.X. However, the equipment using X-ray detection needs to have a high resolution, and new tires are generally of a relatively uniform dark tone, otherwise the defects shown in the final imaging are not obvious, which will affect the detection accuracy. Since the direct manifestation of bulges and cracks on the inner surface of the new tire will cause the inner surface to fluctuate, including obvious flange gaps on the inner surface of the tire when cracks appear, direct contact detection can directly obtain the corresponding defect situation, while the current equipment using direct contact detection mostly relies on manual detection, but in this case, the incomplete detection site will directly cause missed detection and wrong detection, and the detection efficiency needs to be improved to meet the needs of industrial production lines. Summary of the invention

[0004] In view of the technical problems existing in the above-mentioned measuring device, the present invention proposes a measuring device for detecting the inner surface of a pneumatic tire, which has a reasonable design, adopts contact detection, has comprehensive detection, is beneficial to reducing the probability of missed detection or false detection, and is beneficial to improving detection efficiency.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a measuring device for detecting the inner surface of a pneumatic tire provided by the present invention comprises a detection center frame and a displacement sensor, the detection center frame is used to arrange the detection site from the center position of the pneumatic tire, a ZR actuator capable of performing telescopic and rotational actions is arranged on the detection center frame, the execution end of the ZR actuator is directed toward the inner surface of the pneumatic tire and is provided with a Y-shaped arm, the Y-shaped arm is provided with a pair of bow arms at the end away from the ZR actuator, a support arm for controlling the distance between the two bow arms is provided between the bow arms, two pairs of connecting arms are provided at both ends of the two bow arms, the two pairs of connecting arms are arranged on a contouring arm, and the circumference contour of the contouring arm is consistent with that of the pneumatic tire. The cross-sectional contour is matched, a combined transmission belt is arranged on the circumference of the profiling arm, a transmission gear set for driving the combined transmission belt to move along the circumference direction of the profiling arm is arranged between the connecting arm and the profiling arm, a plurality of rolling contact components which are sequentially distributed front and back and are used to elastically contact with the inner surface of the pneumatic tire are arranged on the combined transmission belt, the rolling contact components are connected through a pair of transmission hoses, the transmission hoses are provided with the rolling contact components including moving rollers, the moving rollers are provided with rolling rollers, a pair of displacement sensors which are contacted and matched with the two ends of the rolling rollers are arranged inside the rolling contact components, a transmission line which is used to be electrically connected with the displacement sensor is arranged inside the transmission hose, and a controller is arranged at the transmission terminal of the transmission line.

[0006] Preferably, the combined transmission belt comprises a belt and a copper belt, the cross-sections of the belt and the copper belt are respectively cross-shaped and straight-shaped, a pair of clamping plates for clamping the belt are arranged on the inner circumference of the contouring arm, the clamping plates are L-shaped, and a transmission groove with a T-shaped cross-section is arranged on the outer circumference of the contouring arm, the groove surface of the transmission groove is for the copper belt to move, and a belt track for the belt to make circumferential displacement is formed between the transmission groove and the clamping plates, and the belt, copper belt and rolling contact assembly are synchronously connected.

[0007] Preferably, the transmission gear set includes a rubber soft rack connected to a copper belt, an outer gear ring is provided on the transmission side of the rubber soft rack, two symmetrically distributed gears meshing with the outer gear ring are provided between the two pairs of connecting arms, a wheel axle is provided at the center of the gear, the wheel axle is connected to the connecting arm and the bow arm axis, end caps are provided at the ends of the wheel axles, and a servo motor is provided at the end of one of the wheel axles.

[0008] Preferably, the outer gear ring has a C-shaped structure with its C-shaped opening facing the actuating end of the ZR actuator, an end plate is provided at the end of the C-shaped opening of the outer gear ring, and a radial height of the end plate is greater than a tooth top height of the outer gear ring.

[0009] Preferably, two inner pipes for passing the transmission hose are arranged in parallel inside the rubber soft rack, two outer tubes connected with the transmission hose are arranged on both sides of the rubber soft rack, and the execution end of the Y-arm and the ZR actuator is provided with a hollow channel for the outer tube to pass through.

[0010] Preferably, the rolling contact assembly includes a spacer, which includes an I-shaped connecting plate, a pair of connecting holes are provided at the bottom of the connecting plate, and the connecting holes are used to install screws connecting the belt, the copper belt and the rolling contact assembly. A pair of through pipes for passing the transmission hose are provided at the top of the connecting plate, and countersunk grooves are provided at both ends of the through pipes, which correspond to the guide tubes provided at the bottom of the movable roller, and flexible connecting springs are provided in the guide tubes and the countersunk grooves.

[0011] Preferably, both ends of the guide tube are in an eight-shaped shape, and both ends of the central through tube are in a V-shaped shape.

[0012] Preferably, the movable roller is provided with a support groove for the rolling roller to roll, guide grooves for the axial end of the rolling roller to make radial displacement are provided at both ends of the support groove, a reset spring for supporting the axial end of the rolling roller is provided at the bottom of the guide groove, and the detection end of the displacement sensor is connected to the axial end of the rolling roller from the center of the reset spring.

[0013] Preferably, the rolling roller includes a left roller and a right roller, the opposite ends of the left roller and the right roller are matched with guide grooves, the opposite ends of the left roller facing the right roller are respectively provided with tenons and waist-shaped shaft eyes, the waist-shaped shaft eyes are for the tenons to slide radially, and the opposite ends of the left roller and the right roller are both provided with conical extrusion fitting surfaces.

[0014] Preferably, a plurality of welding tubes are arranged on the side of the contouring arm, the welding tubes are distributed at the turning node positions of the contouring arm, a crutch rod is arranged on the welding tube, a friction roller is arranged on the crutch rod, the friction roller and the belt surface of the combined transmission belt are frictionally transmitted and used to prevent the combined transmission belt from jumping.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are:

[0016] 1. The present invention provides a measuring device for detecting the inner surface of a pneumatic tire. The ZR actuator can control the mechanical structure from the Y-arm to the contour arm to perform telescopic and flipping actions, and is used for the contour arm to enter and exit the detection station. The rolling contact assembly carried by the contour arm can perform stepping actions along the inner surface of the pneumatic tire under the action of the servo motor, the transmission gear set, the combined transmission belt and the transmission hose, and the pneumatic tire can complete rolling on the rolling equipment of the workshop detection station, and the displacement sensor can obtain the corresponding surface data, including the detection of bulges and cracks. The device is reasonably designed, adopts contact detection, has comprehensive detection, is conducive to reducing the probability of missed detection and false detection, and is conducive to improving detection efficiency, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A measuring device for detecting the inner surface of a pneumatic tire and an axonometric view of a full-section pneumatic tire provided in an embodiment;

[0019] Figure 2 A measuring device for detecting the inner surface of a pneumatic tire and a front view of a complete pneumatic tire provided in an embodiment;

[0020] Figure 3 A measuring device for detecting the inner surface of a pneumatic tire and a top view of a full-section pneumatic tire provided in an embodiment;

[0021] Figure 4 A partial cross-sectional view of a measuring device for detecting the inner surface of a pneumatic tire;

[0022] Figure 5 It is a front view of a measuring device for detecting the inner surface of a pneumatic tire (without a detection center frame);

[0023] Figure 6 It is an axonometric view of a measuring device for detecting the inner surface of a pneumatic tire (without a detection center frame);

[0024] Figure 7 A top view of a measuring device for detecting the inner surface of a pneumatic tire (without a detection center frame);

[0025] Figure 8 An exploded view of a rolling contact assembly provided for an embodiment;

[0026] Fig. 9A front view of a rolling contact assembly provided for an embodiment;

[0027] Fig.10 A side view of a rolling contact assembly provided for an embodiment;

[0028] Fig.11 A schematic diagram of the connection between a single rolling contact assembly, a transmission hose and an outer tube provided in an embodiment;

[0029] In the above figures:

[0030] 1. Detection center frame; 2. Displacement sensor; 3. ZR actuator; 4. Y-shaped arm; 5. Bow arm; 6. Support arm; 7. Connecting arm;

[0031] 8. contour arm; 81. clamping plate; 82. transmission groove; 83. belt track; 84. welding pipe; 85. crutch rod; 86. friction roller;

[0032] 9. Combined transmission belt; 91. Belt; 92. Copper belt;

[0033] 10. Transmission gear set; 101. Rubber soft rack; 102. External gear ring; 103. Gear; 104. Axle; 105. End cap; 106. End plate;

[0034] 11. Transmission hose;

[0035] 12. rolling contact assembly; 121. moving roller; 1211. supporting groove; 1212. guide groove; 122. rolling roller; 1221. left roller; 1222. right roller; 1223. tenon; 1224. waist-shaped axis eye; 1225. extrusion fitting surface; 123. spacer; 1231. connecting plate; 1232. connecting hole; 1233. middle through pipe; 1234. countersunk mouth; 124. guide pipe; 125. flexible connecting spring; 126. reset spring;

[0036] 13. Servo motor;

[0037] 14. External control;

[0038] 15. Hollow channel;

[0039] 16. Pneumatic tires. DETAILED DESCRIPTION

[0040] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear below, they only indicate that the upper, lower, left and right directions are consistent with the accompanying drawings themselves, and do not limit the structure.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0042] Examples, such as Figure 1-Figure 11 As shown, the present invention provides a measuring device for detecting the inner surface of a pneumatic tire, comprising a detection center frame 1 and a displacement sensor 2, wherein the detection center frame 1 comprises a ring beam and a cantilever, wherein the maximum diameter of the ring beam is smaller than the inner diameter of the pneumatic tire 16, and the detection center frame 1 is used to arrange the detection site from the center position of the pneumatic tire 16, and the detection center frame 1 is provided with a ZR actuator 3 capable of performing telescopic and rotational actions, wherein the execution end of the ZR actuator 3 faces the inner surface direction of the pneumatic tire 16 and is provided with a Y-shaped arm 4, wherein the Y-shaped arm 4 is provided with a pair of bow arms 5 at the end away from the ZR actuator 3, and a support arm 6 for controlling the distance between the two bow arms 5 is provided between the bow arms 5, and two pairs of connecting arms 7 are provided at both ends of the two bow arms 5, and the two pairs of connecting arms 7 are provided on a contouring arm 8, and the circumference contour of the contouring arm 8 is consistent with the pneumatic tire 16. The cross-sectional profile of the tire 16 is matched, a combined transmission belt 9 is arranged on the circumferential surface of the profiling arm 8, and a transmission gear 103 group 10 for driving the combined transmission belt 9 to move along the circumference direction of the profiling arm 8 is arranged between the connecting arm 7 and the profiling arm 8. A pair of transmission hoses 11 for synchronous displacement therewith are arranged on the combined transmission belt 9, and a plurality of rolling contact components 12 distributed in sequence front and back and used for elastically contacting the inner surface of the inflatable tire 16 are arranged on the transmission hose 11. The rolling contact component 12 includes a moving roller 121, and a rolling roller 122 is arranged on the moving roller 121. A pair of displacement sensors 2 for contacting and matching with the two ends of the rolling roller 122 are arranged inside the rolling contact component 12, and a transmission line for electrically connecting to the displacement sensor 2 is arranged inside the transmission hose 11, and a controller is arranged at the transmission terminal of the transmission line.

[0043] Specifically, the ZR actuator 3 can control the mechanical structure from the Y-arm 4 to the contour arm 8 to perform telescopic and flipping actions, especially the maximum width of the contour arm 8 is larger than the narrower position of the pneumatic tire 16, so the flip design can be used for the contour arm 8 to enter and exit the detection station, so that the rolling contact assembly 12 on the contour arm 8 can better complete the contact detection with the inner surface of the pneumatic tire 16. Further, the rolling contact assembly 12 carried by the contour arm 8 can perform stepping action along the inner surface of the pneumatic tire 16 under the action of the servo motor 13, the transmission gear 103 group 10, the combined transmission belt 9 and the transmission hose 11, and its shortest step length can compensate for the installation gap of the adjacent rolling contact assembly 12 to meet the requirement that the inner surface of the pneumatic tire 16 has a complete detection curve track on a unit cross section. Furthermore, regarding the rolling contact assembly 12, the moving roller 121 can cooperate with the peripheral contour support of the contour arm 8, and in the process of moving along the peripheral surface of the contour arm 8, the rolling roller 122 and the inner surface of the pneumatic tire 16 maintain a fixed theoretical spacing and contact pressure; in this case, when the rolling roller 122 contacts the inner surface of the pneumatic tire 16, the two displacement sensors 2 at the shaft end thereof maintain the initial displacement data, and once the rolling roller 122 passes the position where the bulge and crack appear, the detection end of the displacement sensor 2 will generate the changed displacement data, which is fed back to the controller through the transmission line, and the controller records the tire with surface defects. Since the workshop is also equipped with equipment for the pneumatic tire 16 to complete the rolling at the inspection station of the pneumatic tire 16, on the basis of the continuous rolling of the pneumatic tire 16 for one week, the working surface of the rolling roller 122 basically covers the inner surface of the pneumatic tire 16, and the displacement sensor 2 obtains the corresponding surface data, thereby completing the detection of the bulge and crack. The device is reasonably designed, adopts contact detection, has comprehensive detection, is conducive to reducing the probability of missed detection or false detection, is conducive to improving detection efficiency, and can meet the needs of industrial production lines.

[0044] like Figure 4 , Figure 6 and Figure 7As shown, the combined transmission belt 9 includes a belt 91 and a copper belt 92, the cross-sections of the belt 91 and the copper belt 92 are respectively cross-shaped and straight-shaped. A pair of clamping plates 81 for clamping the belt 91 are arranged on the inner circumference of the contour arm 8, and the clamping plate 81 is L-shaped. A transmission groove 82 with a T-shaped cross-section is arranged on the outer circumference of the contour arm 8. The groove surface of the transmission groove 82 is for the copper belt 92 to move, and a belt track 83 for the belt 91 to make a circumferential displacement is formed between the transmission groove 82 and the clamping plate 81. The belt 91, the copper belt 92 and the rolling contact assembly 12 are synchronously connected. Among them, the cross-section design of the belt 91 and the copper belt 92 can ensure the stability of the transmission action of the two in the transmission groove 82 and the belt track 83, and the belt track 83 is used to limit the movement path of the belt 91. On the basis of the synchronous connection between the belt 91 and the copper belt 92, the copper belt 92 provides a relatively reliable connection basis for connecting the rolling contact assembly 12, and maintains a certain degree of flexibility to meet the continuity and smoothness of the stepping action of all rolling contact assemblies 12 along the outer peripheral surface of the contoured arm 8.

[0045] like Figure 4-Figure 6 As shown, the transmission gear 103 group 10 includes a rubber soft rack 101 connected to the copper belt 92, and the transmission side of the rubber soft rack 101 is provided with an outer gear ring 102. Two symmetrically distributed gears 103 meshing with the outer gear ring 102 are provided between the two pairs of connecting arms 7. A wheel axle 104 is provided at the center of the gear 103. The wheel axle 104 is axially connected to the connecting arm 7 and the bow arm 5. End caps 105 are provided at the ends of the wheel axle 104. The end caps 105 on the same axis are used to reduce the axial movement length of the wheel axle 104, and a servo motor 13 is provided at the end of one of the wheel axles 104. Among them, in order to ensure the detection efficiency, the number of rolling contact components 12 is basically distributed to cover the overlapping projection range of the contour arm 8 and the pneumatic tire 16. To compensate for the missing length of the projection, the servo motor 13 can drive the combined transmission belt 9 to perform a stepping action of about 3 to 5 cm, and the working length of the rubber soft rack 101 provides the longest stepping distance limit for the rolling contact component 12, thereby effectively meeting the needs of the present invention for the detection of the inner surface of the pneumatic tire 16. The servo motor 13 can drive the outer gear ring 102 to rotate by driving the gear 103 to rotate, and the outer gear ring 102 can drive the rubber soft rack 101 to move; furthermore, the upper and lower pairs of gears 103 can play a role in transmission and support for the outer gear ring 102, and because the outer gear ring 102 has a certain rigidity, the rubber soft rack 101 can maintain a high degree of movement stability during the process of connecting and meshing with the transmission working surface of the rubber soft rack 101, thereby ensuring the detection performance of the rolling contact component 12.

[0046] Furthermore, the outer gear ring 102 is in a C-shaped structure and its C-shaped opening faces the execution end of the ZR actuator 3. An end plate 106 is provided at the end of the C-shaped opening of the outer gear ring 102, and the radial height of the end plate 106 is greater than the tooth top height of the outer gear ring 102. Designing the outer gear ring 102 as a C-shaped structure can, on the one hand, make reasonable assembly space for the support arm 6, the Y-shaped arm 4 and the ZR actuator 3, and avoid the stepping range of the outer gear ring 102 from interfering with other structures, and on the other hand, it can also save a considerable amount of material costs. The end plates 106 structure provided at both ends of the outer gear ring 102 can play a limiting role, avoiding the excessive stepping length of the outer gear ring 102 causing the rubber soft rack 101 to have a springboard situation, which is beneficial to ensure the transmission quality of the rubber soft rack 101 and the combined transmission belt 9 to the rolling contact component 12.

[0047] like Figure 4 and Figure 5 As shown, two inner pipes for passing the transmission hose 11 are arranged in parallel inside the rubber soft rack 101, two outer pipes 14 connected with the transmission hose 11 are arranged on both sides of the rubber soft rack 101, and the execution end of the Y-arm 4 and the ZR actuator 3 is provided with a hollow channel 15 for the outer pipe 14 to pass through. If the transmission hose 11 is passed through the rubber soft rack 101, on the one hand, the transmission hose 11 can be prevented from being twisted into the meshing range of the transmission gear 103 group 10, and on the other hand, the transmission path of the transmission hose 11 can be kept relatively uniform, and the rolling contact assembly 12 can be prevented from shaking significantly at the node of the moving turning point.

[0048] like Figure 6-Figure 11As shown, the rolling contact assembly 12 includes a spacer 123, and the spacer 123 includes an I-shaped connecting plate 1231. A pair of connecting holes 1232 are provided at the bottom of the connecting plate 1231. The connecting holes 1232 are used to install screws connecting the belt 91, the copper belt 92 and the rolling contact assembly 12. A pair of through tubes 1233 for passing through the transmission hose 11 are provided at the top of the connecting plate 1231. Countersunk grooves 1234 are provided at both ends of the through tubes 1233. The countersunk grooves 1234 correspond to the guide tubes 124 provided at the bottom of the movable roller 121. Flexible connecting springs 125 are provided in the guide tubes 124 and the countersunk grooves 1234. Among them, the spacer 123 plays a connecting role of the snake joint. After the connecting plate 1231 and the copper belt 92 establish a synchronous connection relationship, the maximum elastic displacement length of the movable roller 121 is basically limited. The middle tube 1233, while ensuring the effective connection of the transmission hose 11, also serves as the end support structure of the flexible connecting spring 125, so that the flexible connecting spring 125 can be effectively maintained between the guide tube 124 and the spacers 123 at both ends. This allows the rolling contact assembly 12 to have a certain flexibility, thereby completing a flexible transition on the curved surface of the contoured arm 8 under the transmission action of the combined transmission belt 9, thereby ensuring the contact effect between the rolling contact assembly 12 and the inner surface of the pneumatic tire 16.

[0049] In order to improve the movement flexibility of adjacent rolling contact components 12, the two ends of the guide tube 124 provided by the present invention are in an eight-shaped shape, and the two ends of the central tube 1233 are in a V-shape. The guide tube 124 and the central tube 1233 are designed in an eight-shaped shape and a V-shaped shape respectively, which not only provides a reasonable compression deformation space for the flexible connecting spring 125, but also provides sufficient bending margin for the rolling contact component 12 when passing through the turning position of the curved surface, thereby improving the smoothness of the rolling contact component 12 when passing through the convex and concave positions.

[0050] In order to improve the coordination effect between the rolling roller 122 and the displacement sensor 2, the present invention provides a support groove 1211 for the rolling roller 122 to roll on the moving roller 121, and guide grooves 1212 for the axial end of the rolling roller 122 to make radial displacement are provided at both ends of the support groove 1211. A reset spring 126 for supporting the axial end of the rolling roller 122 is provided at the bottom of the guide groove 1212, and the detection end of the displacement sensor 2 is connected to the axial end of the rolling roller 122 from the center of the reset spring 126. Among them, the support groove 1211 provides a compression retraction margin for the rolling roller 122, and the guide groove 1212 provides a radial displacement length for the axial end of the rolling roller 122. Moreover, the reset spring 126 allows the roller surface of the rolling roller 122 to always maintain a contact effect with its detection surface, so that the displacement sensor 2 can express the displacement of the rolling roller 122 in real time, and then feedback the bulging problem and crack problem.

[0051] In order to improve the detection performance of the rolling roller 122, the rolling roller 122 provided by the present invention includes a left roller 1221 and a right roller 1222, and the opposite ends of the left roller 1221 and the right roller 1222 are matched with the guide groove 1212, and the opposite ends of the left roller 1221 toward the right roller 1222 are respectively provided with a tenon 1223 and a waist-shaped shaft eye 1224, and the waist-shaped shaft eye 1224 is provided for the tenon 1223 to slide radially, and the opposite ends of the left roller 1221 and the right roller 1222 are both provided with a conical extrusion fitting surface 1225, and the extrusion fitting surface 1225 can allow the left roller 1221 and the right roller 1222 to generate a V-shaped angle at the moment of contacting the undulating surface. In this way, the displacement of the rolling roller 122 located on the same installation surface can be reflected as the approximate length of the crack, and dividing the rolling roller 122 into a left roller 1221 and a right roller 1222, in addition to improving the detection sensitivity of the rolling, can also feedback the approximate width of the crack through the displacement detection situation in the left and right range, thereby enriching the detection data of the equipment and improving the detection efficiency of the pneumatic tire 16.

[0052] like Figure 6 As shown, a plurality of welding tubes 84 are arranged on the side of the profiling arm 8, and the welding tubes 84 are distributed at the turning node positions of the profiling arm 8. A crutch rod 85 is arranged on the welding tube 84, and a friction roller 86 is arranged on the crutch rod 85. The friction roller 86 is frictionally driven with the belt surface of the combined transmission belt 9 and is used to prevent the combined transmission belt 9 from jumping. The welding tube 84, the crutch rod 85 and the friction roller 86 can form an anti-jumping component. By distributing the anti-jumping component at the turning position of the curved surface of the profiling arm 8, the transmission quality of the combined transmission belt 9 can be improved, and the rolling contact performance of the rolling contact component 12 can be improved to a certain extent, which is conducive to ensuring the sensitivity and accuracy of the detection performance of the displacement sensor 2.

[0053] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A measuring device for detecting the inner surface of a pneumatic tire, comprising a detection center frame and a displacement sensor, wherein the detection center frame is used to arrange detection sites from the center position of the pneumatic tire, characterized in that: The detection center frame is provided with a ZR actuator capable of performing telescopic and rotating actions, the execution end of the ZR actuator is oriented toward the inner surface of the pneumatic tire and is provided with a Y-shaped arm, the Y-shaped arm is provided with a pair of bow arms at the end away from the ZR actuator, a support arm for controlling the distance between the two bow arms is provided between the bow arms, two pairs of connecting arms are provided at both ends of the two bow arms, the two pairs of connecting arms are provided on the profiling arm, the perimeter contour of the profiling arm matches the cross-sectional contour of the pneumatic tire, a combined transmission belt is provided on the periphery of the profiling arm, and a support arm is provided between the connecting arm and the profiling arm. A transmission gear set is provided for driving the combined transmission belt to move along the circumference direction of the contoured arm, the combined transmission belt is provided with a pair of transmission hoses which are displaced synchronously therewith, the transmission hose is provided with a plurality of rolling contact components which are sequentially distributed front and back and are used to elastically contact with the inner surface of the pneumatic tire, the rolling contact component includes a moving roller, the moving roller is provided with a rolling roller, a pair of displacement sensors which are contacted and matched with the two ends of the rolling roller are provided inside the rolling contact component, a transmission line which is used to be electrically connected to the displacement sensor is provided inside the transmission hose, and a controller is provided at the transmission terminal of the transmission line.

2. A measuring device for detecting the inner surface of a pneumatic tire according to claim 1, characterized in that: The combined transmission belt comprises a belt and a copper belt, the cross-sections of the belt and the copper belt are respectively in a cross shape and a straight line shape, a pair of clamping plates for clamping the belt are arranged on the inner circumference of the contour arm, the clamping plates are in an L shape, a transmission groove with a T-shaped cross-section is arranged on the outer circumference of the contour arm, the groove surface of the transmission groove is for the copper belt to move, a belt track for the belt to make a circumferential displacement is formed between the transmission groove and the clamping plates, and the belt, the copper belt and the rolling contact assembly are synchronously connected.

3. A measuring device for detecting the inner surface of a pneumatic tire according to claim 2, characterized in that: The transmission gear set includes a rubber soft rack connected to a copper belt, an outer gear ring is provided on the transmission side of the rubber soft rack, two symmetrically distributed gears meshing with the outer gear ring are provided between the two pairs of connecting arms, a wheel axle is provided at the center of the gear, the wheel axle is axially connected to the connecting arm and the bow arm, end caps are provided at the ends of the wheel axles, and a servo motor is provided at the end of one of the wheel axles.

4. A measuring device for detecting the inner surface of a pneumatic tire according to claim 3, characterized in that: The outer gear ring is in a C-shaped structure with its C-shaped opening facing the actuating end of the ZR actuator. An end plate is provided at the end of the C-shaped opening of the outer gear ring, and the radial height of the end plate is greater than the tooth top height of the outer gear ring.

5. A measuring device for detecting the inner surface of a pneumatic tire according to claim 4, characterized in that: Two inner pipes for passing the transmission hose are arranged in parallel inside the rubber soft rack, two outer pipes connected with the transmission hose are arranged on both sides of the rubber soft rack, and the execution ends of the Y-arm and the ZR actuator are provided with hollow channels for the outer pipes to pass through.

6. A measuring device for detecting the inner surface of a pneumatic tire according to claim 1, characterized in that: The rolling contact assembly includes a spacer, and the spacer includes an I-shaped connecting plate. A pair of connecting holes are provided at the bottom of the connecting plate, and screws for installing connecting belts, copper belts and rolling contact assemblies are provided in the connecting holes. A pair of central through pipes for passing transmission hoses are provided at the top of the connecting plate, and countersunk grooves are provided at both ends of the central through pipes, and the countersunk grooves correspond to the guide tubes provided at the bottom of the movable roller. Flexible connecting springs are provided in the guide tubes and the countersunk grooves.

7. A measuring device for detecting the inner surface of a pneumatic tire according to claim 6, characterized in that: The two ends of the guide tube are in an eight-shaped shape, and the two ends of the central through tube are in a V-shaped shape.

8. A measuring device for detecting the inner surface of a pneumatic tire according to claim 1 or 7, characterized in that: The movable roller is provided with a supporting groove for the rolling roller to roll, and guide grooves for the axial end of the rolling roller to make radial displacement are provided at both ends of the supporting groove. A reset spring for supporting the axial end of the rolling roller is provided at the bottom of the guide groove, and the detection end of the displacement sensor is connected to the axial end of the rolling roller from the center of the reset spring.

9. A measuring device for detecting the inner surface of a pneumatic tire according to claim 8, characterized in that: The rolling roller includes a left roller and a right roller, the opposite ends of the left roller and the right roller are matched with the guide groove, the opposite ends of the left roller facing the right roller are respectively provided with a tenon and a waist-shaped shaft eye, the waist-shaped shaft eye is used for the tenon to slide radially, and the opposite ends of the left roller and the right roller are both provided with a conical extrusion fitting surface.

10. The measuring device for detecting the inner surface of a pneumatic tire according to claim 1, characterized in that: A plurality of welding tubes are arranged on the side of the contouring arm, and the welding tubes are distributed at the turning node positions of the contouring arm. A crutch rod is arranged on the welding tube, and a friction roller is arranged on the crutch rod. The friction roller and the belt surface of the combined transmission belt are frictionally transmitted and used to prevent the combined transmission belt from jumping.

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