Inspection unit for inspecting the inner surface of a tire, and tire processing assembly

Abstract

The utility model relates to an inspection unit for inspecting the inner surface of a tire, the inspection unit comprises a base, an imaging device and a driving assembly, and the driving assembly is used for driving the imaging device to move in an inspection plane relative to the base and is also used for driving the imaging device to rotate around a rotation axis perpendicular to the inspection plane.

Description

Technical Field

[0001] The utility model relates to an inspection unit for inspecting the inner surface of a tire, in particular for inspecting the splicing portion of an inner liner of a green tire. The utility model also relates to a processing assembly for processing a tire, wherein the processing assembly comprises the inspection unit of the utility model. Background Art

[0002] US 11198339 B2 discloses an apparatus for detecting and inspecting defects on tires at the end of a production process. The apparatus comprises a workstation having a worktable with a rotating table for supporting the tire; a profiler; a high-resolution color linear camera for scanning the outer surface of the tire tread and shoulder; a mechanical support for the profiler and the color linear camera; a data processor for storing and processing data detected by the profiler and the color linear camera, for providing a three-dimensional model of the tire, and for managing a database including parameters related to surface characteristics of defect-free tires; and an interface for facilitating interaction between an operator and the apparatus. The profiler and the color linear camera are configured to operate simultaneously and perform a comprehensive scan of all contours of the inner and outer surfaces of the tire while the tire rotates at a controlled speed on the rotating table. The data processor is adapted to define and classify the detected defects by comparing the parameters detected by the profiler and the color linear camera with at least one corresponding parameter of a defect-free tire of the same type as the tested tire.

[0003] EP1043578B1 discloses a tire inspection device, wherein the tire is supported on a positioning device, and wherein the measuring head is supported on an inlet above the positioning device. A bracket extending downward from the inlet of the measuring head can be moved biaxially along an axis perpendicular to the measuring head. In addition, the bracket can rotate around its longitudinal axis or around an axis perpendicular to the contact surface of the positioning device for the tire. The measuring head can move up and down along the bracket. Vertical adjustment of the measuring head can also be achieved by adjusting the bracket itself, in particular by the longitudinal setting of the bracket. The measuring head can also be connected to the bracket rotatably around an axis.

[0004] EP1043578B1 further discloses an inspection device, in which three measuring heads are provided, two of which inspect the inner side of the tire carcass and one of which inspects the outer side of the tire carcass. The measuring heads are attached to a support, which is supported on the inlet. The support is vertically adjustable and rotatable about its longitudinal axis. Each measuring head is attached to the support in a multi-axis adjustable manner. On the one hand, they can travel along a radial axis, i.e. their distance from the support is adjustable. In this way, the inspection device can be set or adjusted according to different tire diameters. In addition, all measuring heads can be rotatably supported around a rotation axis on a crossbeam in each case, and the measuring heads are connected to the support via the crossbeam. The rotation axis of the measuring heads preferably extends tangentially to an imaginary circle around the rotation axis of the tire. In addition, in order to inspect the inner side of the tire, the measuring heads can be vertically adjusted relative to the support along an axis extending parallel to the adjustment axis of the support. Therefore, the measuring heads can be vertically adjusted together with the support; in addition, the measuring heads can also be vertically adjusted relative to the support.

[0005] On the one hand, comprehensive adjustment between the measuring heads, either individually or simultaneously, allows the individual measuring heads to be optimally adjusted in each case to the tire cross section to be checked. On the other hand, after the individual adjustment has been made, the tire can be moved by rotating the holder about the longitudinal axis. Utility Model Content

[0006] A disadvantage of known devices for detecting and inspecting defects is that scanning the entire tire is time consuming. In addition, a large amount of data needs to be collected to provide actionable data in all three dimensions.

[0007] Furthermore, scanning the entire tire requires that the tire be placed on a separate rotating table or positioning device. Placing the tire on a rotating table or positioning device may result in inaccurate placement of the tire relative to the profilometer and camera. Furthermore, the tire needs to be flipped on the rotating table so that all surfaces of the tire can be scanned. Such flipping may introduce further inaccuracies, making it difficult to correlate the measurements from both sides and may further delay the inspection process.

[0008] The utility model aims to provide an inspection unit for inspecting the inner surface of a tire and a tire processing assembly comprising the inspection unit, which can inspect a green tire more effectively and / or more accurately.

[0009] According to a first aspect, the utility model relates to an inspection unit for inspecting the inner surface of a tire, wherein the inspection unit comprises a base, an imaging device and a drive assembly, wherein the drive assembly is used to drive the imaging device to move in an inspection plane relative to the base, and to drive the imaging device to rotate around a rotation axis perpendicular to the inspection plane, wherein the imaging device can move relative to the base along the inspection plane in a first direction and in a second direction transversely or perpendicular to the first direction, wherein the drive assembly comprises a first member movable relative to the base and a second member movable relative to the first member, wherein the imaging device can be rotatably mounted to the second member to rotate around the rotation axis, wherein the drive assembly also comprises a rotation drive for driving the imaging device to rotate around the rotation axis, wherein the rotation drive is a belt drive, the belt drive comprising a plurality of pulleys and a belt guided along the plurality of pulleys, wherein the plurality of pulleys comprises an actuating pulley, and the actuating pulley is rotationally connected to the imaging device.

[0010] In other words, the inspection plane spans the first direction and the second direction. By moving the imaging device in the first direction and the second direction, the imaging device can be placed at any desired position in the inspection plane. Furthermore, by moving the imaging device in the first direction and the second direction, the imaging device can be inserted through one of the openings of the tire and into the interior or closed volume of the tire. In addition, the imaging device can be rotated about the rotation axis independently of the movement of the imaging device in the inspection plane.

[0011] Preferably, the actuating pulley is rotatable about an axis of rotation. Thus, the imaging device can be rotated by driving a belt along the pulley. Preferably, the belt is an endless belt encircling the pulley. Preferably, the belt is a toothed belt. A toothed belt can more precisely and / or accurately impart rotation to the actuating pulley.

[0012] In one embodiment thereof, the inspection unit further comprises a control unit operatively connected to the drive assembly for controlling the movement of the imaging device relative to the base in the inspection plane and for controlling the rotation of the imaging device around the rotation axis.

[0013] The inspection unit is arranged to perform the method according to the first aspect of the utility model. Therefore, the inspection unit has the same advantages as described above. In particular, the inspection unit can move and rotate the field of view of the imaging device within the inspection plane. Therefore, when the tire is arranged in an appropriate orientation, for example when the inspection plane intersects the radial plane of the tire, the inspection unit can be used to track the splicing on the inner surface of the tire. In particular, by subsequently positioning the imaging device in two or more inspection positions and / or by rotating the imaging device to two or more inspection angles, the inspection unit can move the field of view of the imaging device along a different number of continuous inspection paths. The control unit may include a database with predetermined inspection positions. The inspection position may, for example, depend on the configuration and / or size of the tire.

[0014] In one embodiment thereof, the control unit is further operatively connected to the imaging device. Preferably, the control unit is configured to scan the inner surface of the tire using the imaging device while moving the imaging device between predetermined inspection positions and / or between relevant inspection angles. In other words, the imaging device may scan the inner surface of the tire while moving the imaging device in the inspection plane. More specifically, the imaging device may scan the splice while moving along the splice.

[0015] Preferably, the control unit is further arranged to control the drive assembly to gradually rotate the imaging device around the rotation axis from the initial examination angle to the continuous examination angle, while moving the imaging device from the initial examination position to the continuous examination position.

[0016] Preferably, the initial examination angle and the consecutive examination angles are the same for the associated initial examination position and consecutive examination positions different from the initial examination position.In other words, the control unit may be arranged to move the imaging device between two consecutive or subsequent examination positions without rotating the imaging device.

[0017] Additionally or alternatively, the initial examination position and the consecutive examination positions are identical for an associated initial examination angle and consecutive examination angles different from the initial examination angle.In other words, the control unit may be arranged to rotate the imaging device between consecutive examination angles without translating the imaging device.

[0018] Preferably, the different number of predetermined inspection positions and related inspection angles is in the range of 2 to 20, preferably in the range of 5 to 15, more preferably in the range of 8 to 10. The number of inspection paths may be large enough to accurately scan the inner surface of the tire along the splice. Furthermore, the number of inspection paths may be small enough to effectively and / or efficiently scan the inner surface of the tire.

[0019] In another embodiment the inspection unit is arranged to measure the distance between said imaging device and an inner surface of the tyre.

[0020] In another embodiment thereof, the drive assembly is pivotable relative to the base about a pivot axis extending in a first direction for pivoting the inspection plane relative to the base. In other words, the angular position of the inspection plane relative to the base can be adjusted. Thus, the angular position of the inspection plane can be adjusted to the splicing angle of the splicing portion relative to the circumferential direction of the tire. Thus, the imaging device can be displaced more precisely along the splicing portion. Thus, the splicing portion can be inspected more accurately.

[0021] In a preferred embodiment, the first direction is a vertical direction. Thus, the inspection plane is a vertical plane. Moving the imaging device in a vertical plane can facilitate inspection of vertically oriented tires.

[0022] In another embodiment, the drive assembly further comprises a first linear actuator for driving the first member to move relative to the base in a first direction and a second linear actuator for driving the second member to move relative to the first member in a second direction. Thus, the imaging device can be independently moved in the first direction and the second direction and rotated about the rotation axis.

[0023] In another embodiment, the plurality of pulleys includes a driven pulley for driving the belt, wherein the driven pulley is located at the first member or at the base. Thus, the rotary drive can affect the rotation of the imaging device about the axis of rotation without the need to mount a motor or drive on the second member. Thus, less weight is added to the second member, and less force is required to move the second member. Thus, the second member and the imaging device mounted thereon can be displaced more accurately, more precisely and / or more efficiently.

[0024] In another preferred embodiment, the field of view of the imaging device is between 25 and 45 degrees, preferably between 30 and 40 degrees. Preferably, the field of view is determined in a direction perpendicular to the examination plane. The field of view is oriented and / or centered in the viewing direction. Preferably, the field of view is centered relative to the examination plane, i.e. the viewing direction extends in the examination plane.

[0025] In another embodiment, the imaging device comprises a laser emitter for projecting a laser line onto the inner surface of the tire and a camera for capturing an image of the laser line. Preferably, the imaging device is arranged to project the laser line onto the inner surface of the tire such that the laser line extends perpendicularly or approximately perpendicularly to the inspection plane. The laser emitter and the camera may be a suitable arrangement for imaging or scanning the profile of the inner surface of the tire, in particular the joints on the inner surface.

[0026] According to a second aspect, the utility model provides a processing assembly for processing a tire, wherein the processing assembly includes an inspection unit according to the first aspect of the utility model, wherein the processing assembly also includes one or more support members for supporting the tire in a supporting position relative to the inspection unit.

[0027] The machining assembly comprises an inspection unit according to the preceding claims and therefore inherently has the same advantages as described above.

[0028] In one embodiment thereof, the inspection unit may be positioned relative to the one or more support members in an inspection position in which, when the tire is in the support position, the inspection plane extends perpendicular to the center plane of the tire or extends at an oblique angle relative to the center plane of the tire. Thus, the inspection plane may be positioned to extend along the joint of the tire. Thus, the inspection unit may move the imaging device along the joint more accurately and / or more precisely.

[0029] In one embodiment thereof, the inspection unit is pivotable relative to one or more support members about a pivot axis to adjust the angle between the inspection plane and the center plane. Thus, the inspection plane can be adjusted to the angle of the joint. Thus, the inspection plane can be positioned more accurately along the joint. Thus, the joint can be tested more accurately and / or more precisely.

[0030] In another embodiment, the tire is arranged in a vertical or perpendicular orientation in a supporting position. The tire may, for example, be supported or suspended on its inner rim or outer surface (i.e., threaded surface). The vertical orientation may allow the imaging device of the inspection unit to be inserted through the opening of the tire in a horizontal or substantially horizontal direction. In the vertical orientation, the tire need not be supported on the sidewall. Thus, deformation of the tire may be reduced or prevented. Thus, the sidewall may be monitored more accurately and / or more precisely.

[0031] In another embodiment, the processing assembly further comprises a transport device for transporting the tire along a transport path, wherein the transport device comprises one or more support members for supporting the tire, wherein the inspection unit is arranged along the transport path. Preferably, the inspection unit is arranged to inspect the tire on the transport device without removing the tire from the transport device. Thus, the tire can be inspected during its transportation. In other words, no separate inspection station is required for inspecting the tire. Thus, all tires can be inspected during the production process. Thus, the tire can be inspected.

[0032] In another embodiment thereof, the transport device is arranged for transporting the tire in a vertical orientation. The tire may, for example, be supported or suspended on its inner rim or outer surface (i.e., threaded surface). The vertical orientation may allow the imaging device of the inspection unit to be inserted through the opening of the tire in a horizontal or substantially horizontal direction.

[0033] The various aspects and features described and shown in the specification can be applied separately wherever possible. These individual aspects, in particular the aspects and features described in the accompanying dependent claims, can become the subject of divisional patent applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be described based on the exemplary embodiments shown in the attached schematic diagrams, wherein:

[0035] Figures 1A-1F A plan view of an assembly for processing a tire according to the present invention is shown, the assembly comprising an inspection unit according to the present invention;

[0036] Figure 2A-2G The exemplary steps of inspecting a tire during the Figure 1D A side view of the inspection unit of the present invention along line II-II;

[0037] Figure 3 Shown according to Figure 2D A cross-sectional view of the inspection unit along line IV-IV in FIG.

[0038] Figure 4A and 4B During a further exemplary step of inspecting a tire according to Figure 3 A cross-sectional view of the inspection unit along line VV in FIG.

[0039] Figure 5A and 5B The exemplary steps of the method for laying a tire flat using a laying device according to an embodiment of the utility model are shown; and

[0040] Fig. 6A and 6B Exemplary steps of a method for laying a tire flat using an alternative laying device according to an alternative embodiment of the present invention are shown. DETAILED DESCRIPTION

[0041] Figures 1A-1F A plan view or top view of a processing assembly 10 for processing a tire 9, in particular a green tire or an unvulcanized tire, according to an exemplary embodiment of the present invention is shown.

[0042] like Figure 2A-2G As can be clearly seen in the figure, the tire 9 has a substantially cylindrical or annular shape extending in a circumferential and / or concentric direction around the tire axis X. In particular, the tire 9 has a C-shaped, U-shaped or substantially C-shaped or substantially U-shaped cross-section extending in a circumferential direction C around the tire axis X. The tire 9 also defines a center plane U. The center plane U extends perpendicular to the tire axis X. Preferably, the center plane U is a symmetry plane.

[0043] The tire 9 comprises a first lateral side 93 and a second lateral side 94 on opposite sides of the tire 9 in a lateral direction extending parallel to the tire axis X. In other words, the first lateral side 93 and the second lateral side 94 are located on opposite sides of the center plane U. The tire 9 has two circular or substantially circular openings 90 in respective lateral sides 93, 94. The openings 90 extend in a concentric or circumferential direction around the tire axis X.

[0044] The tire 9 also has an outer surface 92 that is radially outward relative to the tire axis X. The outer surface can be formed, for example, by a tread layer (not shown). The outer surface 92 extends in a circumferential and / or concentric direction around the tire axis X. The tire 9 also includes an inner surface 91 that is radially inward, i.e., the inner surface 91 faces the tire axis X. The inner surface 91 and the lateral sides 93, 94 define an interior space V of the tire 9.

[0045] In this particular example, the inner surface is at least partially formed by an inner liner. The inner liner has been spliced ​​along or at the inner surface 91 at a splice G. The splice G extends on or along the inner surface 91 in a splicing direction D transverse to the circumferential direction C of the tire 9. Depending on the configuration of the tire 9, the splicing direction D may be perpendicular to the circumferential direction C of the tire 9, i.e. parallel to the tire axis X. Alternatively, the splicing direction D may extend at an acute or obtuse angle relative to the circumferential direction of the tire 9.

[0046] like Figures 1A-1F As further shown, the processing assembly 10 includes a tire building drum 11 for assembling and / or building a tire 9, a flattening device 12 for receiving the tire 9 and placing the tire 9 in a flattening orientation, and a transport device 13 for transporting the tire 9 from the tire building drum 11 to the flattening device 12. The tire processing assembly 10 also includes a transfer ring 14 for removing the tire 9 from the tire building drum 11 and for transferring the tire 9 to the transport device 13.

[0047] The transport device 13 comprises a track 130 extending between the transfer ring 14 and the lay-down device 12, and a carriage 133 movable along the track 130. In this specific embodiment, the track extends from the transfer ring 14 to the lay-down device 12 in the transport direction T. Therefore, the carriage 133 can be moved along the track 130 in the transport direction T for transporting the tire 9 from the transfer ring 12 to the lay-down device 12.

[0048] like Figure 2A-2GAs can be clearly seen in the figure, the transport device 13 further comprises one or more supporting members 131, preferably one or more supporting rollers, for supporting the tire 9. More specifically, the one or more supporting members 131 are arranged to support the tire 9 in a supporting position relative to the inspection unit 1. When in said supporting position, the inspection unit 11 can be positioned in an inspection position in which an inspection plane P intersects the tire 9. More specifically, in said inspection position, the inspection plane P intersects the center plane U of the tire 9.

[0049] The support members 131 extend from and are carried or supported by the carriage 133. In the embodiment shown in the figures, the support members 131 are arranged to support the inner edge of the tire 9. In other words, one or more support members 131 are arranged to be inserted through the opening 90 of the tire 9. Alternatively, the support members may be arranged to support the circumferential outer surface 92 of the tire 9.

[0050] The transport device 13 is arranged for holding the tire 9 in a vertical orientation, i.e. the tire axis X extends horizontally or substantially horizontally. Preferably, the transport device 13 is arranged for transporting the tire 9 in an orientation in which the tire axis X extends transversely or perpendicularly to the transport direction T. In particular, the support member 131 extends transversely or perpendicularly to the transport direction T while transporting the tire in the transport direction T.

[0051] Optionally, the transport device 13 is further provided with one or more load cells 132 for measuring the weight of the tire 9. Preferably, each of the one or more load cells 132 is arranged between the carriage 133 and a corresponding one of the support members 131. Thus, the weight of the tire 9 can be measured while the transport device 13 is transporting the tire. Therefore, a separate weighing station is not required.

[0052] The transport device 13 may further include a label applicator 15 for applying a label to the tire 9. Alternatively, the label applicator may be used to apply a mark or marking on the tire 9. The label, mark or marking may, for example, include information about the configuration and / or size of the tire 9. Additionally or alternatively, the weight of the tire 9 measured by the load cell 132 may also be marked on the tire 9. The label applicator 15 may apply the label to the tire 9 while the tire 9 is being transported by the transport device 13. Thus, a separate sticking station or marking station is not required.

[0053] like Figure 1D and 1E As can be further clearly seen in FIG. 1 , the transport device 13 can be arranged to rotate or pivot the tire 9 about the transfer axis Y into a transfer orientation for transferring the tire 9 to the lay-down device 12. Specifically, as Figure 5A and 6AAs shown, the carriage 133 is rotatable relative to the track 130 about the transfer axis Y. In the transfer orientation, the tire axis X extends parallel or substantially parallel to the transport direction Z.

[0054] like Figure 5A and 5B As shown, the flattening unit 12 includes a flattening support 121 and a plurality of flattening rollers 122. The flattening rollers 122 and the flattening support 121 form an L-shaped or substantially L-shaped frame for supporting the tire 9. The frame can be rotated around a flattening axis E as shown in FIG. Figure 5A The receiving orientation shown and Figure 5B The lay-flat axis E is located upstream of the lay-flat roller 122 in the transport direction T. The lay-flat roller 122 and the lay-flat support 121 each extend perpendicularly to the lay-flat axis E. Preferably, the lay-flat rollers constitute roller conveyor sections. The lay-flat support 121 may also comprise a roller conveyor.

[0055] like Figure 5A As shown, in the receiving orientation, the lay-flat roller 122 extends substantially vertically or upwardly. The lay-flat support 121 extends in a horizontal direction or substantially in a horizontal direction. The tire 9 has been transported to the lay-flat unit 12 so that the outer surface 92 of the tire 9 faces the lay-flat support 121 and the first side 93 of the tire faces the lay-flat roller 122. Preferably, the tire 9 is supported on the lay-flat support 121 by the outer surface 92. Optionally, the first side 93 of the tire 9 abuts against the lay-flat roller 122. When the tire 9 is supported on the lay-flat support 121, the support member 131 of the transport device 13 can be retracted from the tire 9. Subsequently, the lay-flat device 12 can be rotated from the receiving orientation to the lay-flat orientation.

[0056] like Figure 5B As shown, in the lay-flat orientation, the lay-flat roller 122 extends in a horizontal plane or substantially in a horizontal plane. The tire 9 has been pivoted about the lay-flat axis E and its first side 93 is now supported on the lay-flat roller 122. Subsequently, the tire 9 can be further transported on its first side 93.

[0057] Fig. 6A and 6B Another laying-down device 212 is shown. This other laying-down device 212 differs from the previously discussed laying-down device 12 in that the laying-down axis E is located downstream of the laying-down rollers 222 in the transport direction T. The laying-down rollers 222 are arranged to accommodate the supporting members 131 of the transport device 13 .

[0058] The tire processing assembly 10 further comprises an inspection unit 1 for inspecting the tire 9, in particular the inner surface 91 of the tire 9. More specifically, the inspection unit is arranged to inspect the splice G on the inner surface 91 of the tire 9. The inspection unit 1 is arranged along the transport device 13. In particular, the inspection unit 1 is arranged along or close to the transport device in a direction transverse to the transport direction Z. The inspection unit 1 is arranged to extend into the inner space of the tire 9 through one of the openings 90 while the tire is supported by the transport device 13.

[0059] like Figures 2A-2F As can be clearly seen in the figure, the inspection unit 1 includes an imaging device 2 for scanning or imaging the inner surface 91 of the tire 9. The imaging device 2 may, for example, include a profilometer or a profiler for detecting and / or imaging the height profile of the inner surface 91 of the tire 9. In this specific embodiment, the imaging device 2 includes a laser emitter for projecting a laser line L onto the inner surface 91 of the tire 9 and a camera for capturing the image of the laser line L on the inner surface 91.

[0060] Optionally, the transport device 13 further comprises a shielding unit 134 for shielding the laser of the imaging device 2. Specifically, the shielding unit is arranged to prevent the laser of the imaging unit from being emitted to the outside of the tire 9 through the opening 90 of the tire 9. The shielding unit 134 is supported and / or suspended on the carriage 133. The shielding unit 134 is arranged to cover at least a portion of the tire opening 90 along the tire axis X. The shielding unit 134 may, for example, comprise a laser shielding material plate or a laser shielding material sheet.

[0061] The camera of the imaging device 2 has a field of view W oriented along and / or centered on an observation direction F. The observation direction F extends at a slight angle relative to the emitted laser light, and is used to capture the contour of the inner surface 91 along the projected laser line L. Specifically, the observation direction F is oriented at an angle relative to the emitted laser light, so that the projected laser line L is located within the field of view W of the imaging device 2.

[0062] like Figure 3 , 4A As shown in FIGS. 4B and 4C , the imaging device 2 is arranged to project the laser line L so that the laser line L extends transversely or perpendicularly to the splicing portion G. More specifically, the imaging device 2 is arranged to project the laser line L onto the inner surface 91 of the tire 9 so that the laser line extends perpendicularly or approximately perpendicularly to the inspection plane P. In this specific embodiment, the field of view W around the observation direction F (i.e., the projection direction of the laser line L) is between twenty-five and forty-five degrees. Preferably, the field of view W in the projection direction of the laser line L is between thirty and forty degrees.

[0063] The imaging device 2 can, for example, have a focusing distance of forty millimeters and a focusing range in the viewing direction F of between five millimeters and seventy-five millimeters.

[0064] Preferably, the inspection unit 1 is arranged for measuring the distance between the imaging device 2 and the inner surface 91 of the tyre 9. For example, the imaging device 2 may comprise a triangulation camera for determining said distance.

[0065] The inspection unit 1 further comprises a base 8 and a drive assembly 3 for moving the imaging device 2 relative to the base 8. In particular, the drive assembly 3 is arranged to drive the movement of the imaging device 2 relative to the base 8 in the inspection plane P. Figures 2A-2F As shown, the inspection plane P is spanned by a first direction A and a second direction B that is transverse or perpendicular to the first direction A. Preferably, as Figures 2A-2F As shown, the first direction A is a vertical or vertical direction. In other words, the inspection plane P is a vertical or vertical plane.

[0066] The driving assembly 3 includes a first member 31 movable relative to the base 8 and a first driver 4 for driving the first member 31 to move relative to the base 8. In the embodiment shown in the figure, the first member 31 is movable relative to the base 8 in a first direction A. Therefore, the first driver 4 is a linear driver. Specifically, the first driver 4 includes a spindle 41 for moving the first member 31 back and forth in the first direction A.

[0067] The drive assembly 3 further comprises a second member 32 movable relative to the first member 31 and a second drive 5 for driving the second member 32 to move relative to the first member 31. In the embodiment shown in the figure, the second member 32 is movable relative to the first member 31 in a second direction B. In this particular embodiment, the second drive 5 is a linear drive comprising a belt and pulley system having a first pulley 51 and a second pulley 52. ​​Alternatively, the second drive 5 may, for example, comprise a spindle drive.

[0068] like Figures 2A-2F It can be further seen in FIG. 3 that the drive assembly 3 is further arranged to drive the imaging device 2 to rotate around a rotation axis R perpendicular to the inspection plane P. Specifically, the drive assembly 2 is arranged to drive the imaging device 2 to rotate around the rotation axis R relative to the second member 32 .

[0069] The driving assembly 3 comprises a rotary drive 6 for driving the imaging device 2 to rotate about a rotation axis R. The rotary drive 6 comprises a plurality of pulleys 63, 64, 65 and a belt 61 guided along the plurality of pulleys 63, 64, 65. Preferably, the belt 61 is a toothed belt.

[0070] The plurality of pulleys 63, 64, 65 include a third pulley or driven pulley 63 for driving the belt 61. The driven pulley 63 can be driven, for example, by a servo motor (not shown). The driven pulley 63 is located on the first member 31 of the drive assembly 3. Alternatively, the driven pulley 63 can be located, for example, on the base 8. Thus, the associated servo motor can be located at a position separate from the second member 32 of the drive assembly 3. As a result, the second member 32 can be moved more accurately, more precisely and / or more efficiently in the second direction B.

[0071] The plurality of pulleys 63, 64, 65 further comprises an actuating pulley 65, which is rotationally coupled to the imaging device 2. In other words, the rotation of the imaging device 2 is rotated about the rotation axis R by the actuating pulley 65. The actuating pulley 65 is mounted to the second member 32 of the drive assembly 3. In the embodiment shown in the figure, the actuating pulley 65 is rotatable about the rotation axis R. Preferably, the imaging device 2 is rotatable together with the actuating pulley 65 or can be rotated together.

[0072] The one or more pulleys 63, 64, 65 further include a plurality of fourth pulleys 64 for guiding the belt 61 between the actuating pulley 65 and the driven pulley 63. The fourth pulley 64 is a passive pulley, i.e., the pulley is freely rotatable. The fourth pulleys 64 are distributed on the first member 31 and the second member 32 of the drive assembly 3. Specifically, the fourth pulley 64 is arranged to allow the belt 61 to extend and retract as the second member 32 moves relative to the first member 31.

[0073] like Figures 2A-2F As further shown, the rotary drive comprises two tension rollers 66. One of the tension rollers 66 is located at the actuating pulley 65. The tension roller 66 guides the belt 61 along a larger part of the circumference of the actuating pulley 65. As a result, the belt can better grip the actuating pulley 65. As a result, the actuating pulley 65 can be rotated more accurately and / or more precisely around the axis of rotation. The other tension roller 66 guides the belt along a larger part of the circumference of the fourth pulley 64 on the first member 31.

[0074] like Figure 4A As shown, the inspection unit 1 can be positioned relative to one or more support members 131 in a first operating position, in which the inspection plane P is perpendicular to or extends to the central plane U. Figure 4B As further shown, the inspection unit 1 can be further positioned relative to the one or more support members 131 in another operating position, in which the inspection plane P extends at an oblique angle relative to the central plane U. Preferably, the inspection unit 1 can be moved between the first operating position and the further operating position. More specifically, the drive assembly 3 can be pivoted relative to the base 8 about the pivot axis K. In other words, the inspection plane P can be pivoted about the pivot axis K. Preferably, as Figure 2A-2G As shown, the pivot axis K extends in the first direction A. Alternatively, one or more support members 131 may be pivotable relative to the inspection plane P about another pivot axis (not shown) extending parallel to the inspection plane P. Preferably, the another pivot axis extends in the first direction A.

[0075] A method for inspecting the inner surface 91 of the tire 9 will now be described. The method includes scanning or imaging the splice G with the imaging device 2. Specifically, the method includes scanning or imaging the splice G with the imaging device 2 while moving the field of view W and / or the laser line L of the imaging device 2 along the splice G. The imaging device 2 may detect the height profile of the splice G using, for example, a laser emitter and a camera.

[0076] like Figure 1D As shown, the tire 9 is arranged at the inspection unit 1 by the transport device 13. The tire 9 is supported on one or more support members 131 at a supporting position. The method may include the step of orienting and / or positioning the tire 9 so that the splicing portion G is at or approximately at a predetermined inspection position, for example, a predetermined inspection position relative to the inspection unit 1. This step may, for example, include tracking the position of the splicing portion G along the circumferential direction C of the tire 9 on the tire building drum 11, the transfer ring 14 and / or the transport device 13. Alternatively, a mark may also be placed on the tire 9 to indicate the position of the splicing portion G in the circumferential direction C of the tire 9. In the example Figure 2A In the illustrated embodiment, the splice G is located at a predetermined orientation at or near the bottom of the tire 9 .

[0077] Figure 2A The initial state of the inspection unit 1 is shown. The tire 9 has been transported to the inspection unit 1 by the transport device 13. In other words, the tire 9 has been transported to and / or to a support position, wherein the tire 9 is suspended in a vertical or substantially vertical orientation on one or more support members 131. The inspection unit 1 is in an idle or retracted state. Preferably, in the idle or retracted state, the inspection unit 1 allows the tire to be transported along the transport direction T to and / or past the inspection station.

[0078] like Figure 2BAs shown, the imaging device 2 has been moved through the opening 90 of the tire 9 to a first inspection position S1 within the interior space V of the tire 9. The first inspection position S1 is located in the inspection plane P. The imaging device 2 has been rotated around the rotation axis R to a first inspection angle H1. Specifically, the field of view W of the imaging device 2 has been rotated around the rotation axis R to the first inspection angle H1. In the embodiment shown in the figure, the first inspection angle H1 is defined as the relative angle between the field of view W and the horizontal axis. Alternatively, the first inspection angle H1 may be related to a vertical axis, a reference plane on the second member 32, or a center axis X of the tire 9, for example. Preferably, at the first inspection angle H1, the field of view W extends perpendicularly or approximately perpendicularly to the inner surface 91 of the tire 9.

[0079] like Figure 2C As shown, the imaging device 2 has scanned the first inspection path T1 along the inner surface 91 of the tire 9. Specifically, while scanning the inner surface 91 of the tire 9, the field of view W of the imaging device 2 has moved along the first inspection path T1.

[0080] The imaging device 2 has been moved from a first inspection position S1 to a second inspection position S2. In the case of the first inspection path T1, the first inspection position S1 is an initial inspection position and the second inspection position S2 is a continuous inspection position. The second inspection position S2 is located in the inspection plane P. Specifically, the imaging device 2 has been displaced from the first inspection position S1 along a first direction A and a second direction B. Preferably, the imaging device 2 has been moved linearly (i.e., along a straight line) from the first inspection position S1 to the second inspection position S2.

[0081] like Figure 2C As further shown, the field of view W of the imaging device 2 has been rotated from the first inspection angle H1 to the second inspection angle H2 around the rotation axis R. Preferably, when the imaging device is rotated from the first inspection position S1 to the second inspection position S2, the field of view W of the imaging device 2 is rotated from the first inspection angle H1 to the second inspection angle H2. More preferably, while the imaging device 2 is moved from the first inspection position S1 to the second inspection position S2, the field of view W is gradually rotated from the first inspection angle H1 to the second inspection angle H2. In other words, the rotation of the field of view W is proportional to the movement of the imaging device 2.

[0082] like Figure 2DAs shown, the imaging device 2 has moved from the second inspection position S2 to the third inspection position S3, and has rotated from the second detection angle H2 to the third detection angle H3 around the rotation axis R to scan the second inspection path T2 along the inner surface of the tire 9. The scanning of the second inspection path T2 is performed in a manner similar to the scanning of the first inspection path T1. In the case of the second inspection path T2, the second inspection position S2 is the initial inspection position and the third inspection position S3 is the continuous inspection position. Therefore, the second inspection angle H2 is the initial inspection angle and the third inspection angle H3 is the continuous inspection angle. In the third inspection position S3, the imaging device 2 is at least partially located between the first side 93 and the second side 94 of the tire 9. In other words, the imaging device 2 is located below the opening in the tire 90 along the first direction A.

[0083] like Figure 2E-2G As further shown, the imaging device 2 then moves to the fourth inspection position S4, the fifth inspection position S5 and the sixth inspection position S6, and rotates to the associated fourth inspection angle H4, the fifth inspection angle H5 and the sixth inspection angle H6 to move the field of view W along the third inspection path T3, the fourth inspection path T4 and the fifth inspection path T5, respectively. The inspection paths T1-T5 may partially overlap. Preferably, the inspection paths T1-T5 form a continuous or consecutive inspection path.

[0084] Any different number N of predetermined inspection positions S1-Sn and associated inspection angles H1-Hn may be selected to inspect the inner surface 91 of the tire 9. Preferably, the number N of predetermined inspection positions S1-Sn is between three and twenty. More preferably, the number N of predetermined inspection positions S1-Sn is between five and fifteen inspection positions S1-Sn, for example eight inspection positions S1-Sn. Preferably, the number M of inspection paths T1-Tm is equal to the number N of predetermined inspection points S1-Sn minus one.

[0085] like Figure 4A and 4B As shown, the splice G on the inner surface 91 of the tire 9 extends at an oblique angle relative to the tire axis X. In other words, the splice G extends at an acute angle or an obtuse angle relative to the circumferential direction C of the wheel 9.

[0086] like Figure 4A As shown, the inspection plane P extends parallel or in line with the tire axis X. Therefore, the inspection plane P extends at an acute or obtuse angle relative to the joint G. In other words, the field of view W of the imaging device 2 along the entire inspection path T is not centered on the joint.

[0087] like Figure 4BAs shown, the method may further include the step of adjusting the angular position of the inspection plane P relative to the tire 9. Specifically, the method may include adjusting the angular position of the inspection plane P relative to the tire 9 by rotating the drive assembly 3 around the pivot axis K. Preferably, the drive assembly 3 is rotated around the pivot axis K to an angular position at which the inspection plane P is parallel to or substantially parallel to the extension position of at least a portion of the splicing portion G. More preferably, the drive assembly 3 is rotated around the pivot axis K to an angular position at which at least a portion of the splicing portion G extends in the inspection plane P or substantially in the inspection plane P.

[0088] Or, for example, Figure 4A As shown, the angular position of the inspection plane P relative to the stitching portion G can be set to a sufficiently small mutual angle that allows the stitching portion G to be located within the field of view W of the imaging device 2 when the imaging device 2 is moved and / or rotated within the inspection plane P.

[0089] like Figures 2A-2F and Figure 3 As further shown, the inspection unit 1 further comprises a control unit 7, which is operably connected to the drive assembly 3 for controlling the movement of the imaging device 2. Specifically, the control unit 7 is configured to cause the inspection unit 1 to perform the method as described above. Preferably, the control unit 7 is further operably connected to the imaging device 2. For example, the control unit 7 can be configured to use the imaging device 2 to scan the inner surface 91 of the tire 9 while moving the imaging device 2 between one or more inspection positions S1-Sn and / or one or more inspection angles H1-Hn. Preferably, the control unit 7 comprises a memory for storing one or more inspection positions S1-Sn and one or more inspection angles H1-Hn. The control unit 7 can be connected to an interface and / or input device (not shown), which an operator can use to input one or more inspection positions S1-Sn and one or more inspection angles H1-Hn in the memory of the control unit 7. The control unit 7 can be configured to store a fixed number N or a variable number N of inspection positions S1-Sn and inspection angles H1-Hn in its memory. Alternatively, the one or more inspection positions S1 -Sn and the one or more inspection angles H1 -Hn may be pre-programmed into a memory of the control unit 7 .

[0090] Preferably, the control unit 7 has access to a database in which predetermined dimensional data related to the shape and / or size of the tire 9 are stored. The control unit 7 may be configured to compare the inspection positions S1-Sn and the inspection angles H1-Hn in its memory with the configuration of the tire 9 stored in the database. Preferably, the control unit 7 is configured to calculate the expected distance between the imaging device 2 and the inner surface 91 for each inspection path T1-Tm based on the dimensional data and the stored inspection positions S1-Sn and inspection angles H1-Hn. Thus, the control unit 7 may, for example, be configured to provide feedback to the operator, indicating whether the inspection positions S1-Sn and inspection angles H1-Hn stored in the memory are suitable for the method of inspecting the inner surface 91 of the tire 9.

[0091] Preferably, the method of the present invention further comprises a step of calibrating the inspection unit 1 before inspecting a batch of tires 9 having the same configuration (eg having the same size).

[0092] The method comprises, for each inspection position S1-Sn, measuring the distance between the imaging device 2 and the inner surface 91 of the tire 9 and checking whether the distance is within a predetermined interval. The distance between the imaging device 2 and the inner surface 91 of the tire 9 can be determined individually for each inspection point S1-Sn. Alternatively or additionally, the distance between the imaging device 2 and the inner surface 91 of the tire can be determined along at least a portion of each inspection path T1-Tn. Preferably, the distance between the imaging device 2 and the inner surface 91 of the tire is determined over the entire length of each inspection path T1-Tn. For example, for each inspection position S1-Sn, the predetermined interval of the distance between the imaging device 2 and the inner surface 91 of the tire 9 can be between five millimeters and seventy-five millimeters. Preferably, for each inspection position S1-Sn, the distance is between twenty millimeters and sixty millimeters.

[0093] The method further includes correcting the inspection positions S1-Sn and / or the associated inspection angles H1-Hn when the respective distances between the imaging device 2 and the inner surface 91 of the tire 9 are not within the predetermined interval.

[0094] Preferably, the above calibration step is performed once before checking a plurality or a batch of tyres 9 having the same configuration and / or size. The calibration step may be pre-programmed in the control unit 7.

[0095] It should be understood that the above description is included to illustrate the operation of the preferred embodiment, rather than to limit the scope of the present invention. According to the above discussion, those skilled in the art will clearly see many changes, which will still be covered by the scope of the present invention.

[0096] Reference numerals list :

[0097] 1 Inspection unit

[0098] 2 Imaging device

[0099] 3. Drive components

[0100] 31 First Component

[0101] 32 Second component

[0102] 4First Linear Drive

[0103] 41 Spindle drive

[0104] 5 Second linear drive

[0105] 51 First pulley

[0106] 52 Second pulley

[0107] 6 Rotary drive

[0108] 61 belt

[0109] 63 Third pulley or driven pulley

[0110] 64 Fourth pulley

[0111] 65 Fifth pulley or actuating pulley

[0112] 66 tension roller

[0113] 7Control Unit

[0114] 8 Base

[0115] 9 Tires

[0116] 90 openings

[0117] 91Inner surface

[0118] 92 External surface

[0119] 93 First side

[0120] 94 Second side

[0121] 10Tire processing components

[0122] 11Tire Building Drum

[0123] 12 Flat Laying Device

[0124] 121 horizontal support

[0125] 122 flat roller

[0126] 13 Transport device

[0127] 130 rails

[0128] 131 Supporting members

[0129] 132 weighing sensor

[0130] 133 Slide

[0131] 134 Shielding elements

[0132] 14 Transfer ring

[0133] 15 Label Applicator

[0134] 210 Alternative tire processing components

[0135] 212 Alternative flat placement device

[0136] 221 horizontal support

[0137] 222 flat roller

[0138] AFirst Direction

[0139] B Second direction

[0140] C Circumferential direction

[0141] D Splicing direction

[0142] E horizontal axis

[0143] F Observation direction

[0144] G stitching

[0145] H1-Hn inspection angle

[0146] K Pivot axis

[0147] L Laser Line

[0148] M The number of paths to check

[0149] N is the number of locations to check

[0150] P Check plane

[0151] RRotation axis

[0152] S1-Sn Check position

[0153] T1-Tm inspection path

[0154] U center plane

[0155] VInterior Space

[0156] W Vision

[0157] X tire axis

[0158] Y transfer axis

[0159] Z transport direction

Claims

1. An inspection unit for inspecting the inner surface of a tire, characterized in that: The inspection unit comprises a base, an imaging device and a driving assembly, wherein the driving assembly is used to drive the imaging device to move relative to the base in an inspection plane and to drive the imaging device to rotate around a rotation axis perpendicular to the inspection plane. wherein the imaging device is movable relative to the base along the inspection plane in a first direction and in a second direction transverse to or perpendicular to the first direction, wherein the drive assembly comprises a first member movable relative to the base and a second member movable relative to the first member, wherein the imaging device is rotatably mounted to the second member to rotate about the rotation axis, Wherein, the driving assembly further comprises a rotation driver for driving the imaging device to rotate around the rotation axis, Wherein, the rotation drive is a belt drive, the belt drive comprising a plurality of pulleys and a belt guided along the plurality of pulleys, wherein the plurality of pulleys comprises an actuating pulley, the actuating pulley being rotationally coupled to the imaging device.

2. The inspection unit according to claim 1, wherein: The examination unit further comprises a control unit operatively connected to the drive assembly for controlling the movement of the imaging device relative to the base in the examination plane and for controlling the rotation of the imaging device about the rotation axis.

3. The inspection unit according to claim 2, wherein: The control unit is also operatively connected to the imaging device.

4. The inspection unit according to claim 1, wherein: The inspection unit is arranged to measure a distance between the imaging device and an inner surface of the tire.

5. The inspection unit according to claim 1, wherein: The drive assembly is pivotable relative to the base about a pivot axis extending in the first direction for pivoting the examination plane relative to the base.

6. The inspection unit according to claim 1, wherein: The first direction is a vertical direction.

7. The inspection unit according to claim 1, wherein: The drive assembly further includes a first linear drive and a second linear drive, wherein the first linear drive is used to drive the first member to move relative to the base in the first direction, and the second linear drive is used to drive the second member to move relative to the first member in the second direction.

8. The inspection unit according to claim 1, wherein: The actuating pulley is rotatable about the rotation axis.

9. The inspection unit according to claim 1, wherein: The plurality of pulleys include a driven pulley for driving the belt, wherein the driven pulley is located at the first member or at the base.

10. The inspection unit according to claim 1, wherein: The belt is a toothed belt.

11. The inspection unit according to claim 1, wherein: The imaging device has a field of view oriented along or centered in a viewing direction, wherein the field of view is between twenty-five and forty-five degrees, or between thirty and forty degrees, in a direction perpendicular to the examination plane.

12. The inspection unit according to claim 1, wherein: The imaging device includes a laser emitter for projecting a laser line onto the inner surface of the tire and a camera for capturing an image of the laser line.

13. The inspection unit according to claim 12, wherein: The laser emitter is arranged for projecting the laser line onto the tire inner surface such that the laser line extends perpendicularly to the inspection plane.

14. A processing assembly for processing a tire, characterized in that: The processing assembly comprises an inspection unit according to claim 1, wherein the processing assembly further comprises one or more support members for supporting the tire in a support position relative to the inspection unit, in which the inspection plane intersects the tire when the tire is in the support position.

15. The processing assembly according to claim 14, wherein: The inspection unit is positionable relative to the one or more support members in an operating position in which the inspection plane extends perpendicularly to a centre plane of the tyre or at an oblique angle to the centre plane of the tyre when the tyre is in the supporting position.

16. The processing assembly according to claim 15, wherein: The inspection unit is pivotable relative to one or more support members about a pivot axis to adjust an angle between the inspection plane and the center plane.

17. The processing assembly according to claim 14, wherein: In the supported position, the tire is arranged in a vertical orientation.

18. The processing assembly of claim 14, wherein: The machining assembly further comprises a transport device for transporting the tire along a transport path, wherein the transport device comprises the one or more supporting members for supporting the tire, wherein the inspection unit is arranged along the transport path.

19. The processing assembly according to claim 18, wherein: The inspection unit is configured to inspect a tire on the transport device without removing the tire from the transport device.

Images