A device and method for automatically measuring tire eccentricity

Abstract

The application discloses a kind of tire eccentricity automatic measuring device, comprising: tread laser sensor, with first drive assembly transmission connection to move in X (horizontal) and Y (vertical) direction;Same model upper sidewall laser sensor and lower sidewall laser sensor are respectively with second drive assembly and third drive assembly transmission connection to carry out position adjustment in X direction and Y direction;Controller receives the model and detection information of each laser sensor, to position it on XY plane, and is electrically connected with each drive assembly, to determine the design position of each laser sensor and carry out the position adjustment of each laser sensor on XY plane.The application positions each laser sensor by controller, and calculates its design detection position, realizes the position adjustment of laser sensor by each drive assembly, compared with manual operation, positioning is accurate and will not produce collision.The application also discloses a kind of measurement method for eccentricity measurement using the above measuring device.

Description

Technical Field

[0001] This invention relates to the field of tire production testing equipment technology, and in particular to an automatic tire eccentricity measuring device and method. Background Technology

[0002] Tire eccentricity refers to parameters such as tire sidewall and tread movement, as well as bulges and depressions on the tire surface. The commonly used tire eccentricity measurement device is a tire eccentricity testing machine, which uses a non-contact laser sensor to analyze tire eccentricity parameters by detecting changes in the distance between the laser sensor and the tire surface.

[0003] To accurately measure tire eccentricity, the measurement position of the laser sensor needs to be determined based on its measurement range and the tire's position. Currently, when the tire is fixed on the main shaft, three laser sensors positioned on the tire's bisecting plane are used to measure tire eccentricity. These three sensors are driven by independent drive shafts in both horizontal and vertical directions to detect positions on the tire's platform and both sides. However, in existing technology, the adjustment of the laser sensor positions is done manually. Manual operation is prone to deviations in laser sensor position adjustment due to human differences, resulting in inconsistent detection data. Furthermore, after changing the tire, the operator needs to reset the laser sensor positions, which is not only cumbersome and inefficient but also results in poor consistency across multiple operations. Finally, limited by the laser sensor's detection range, manual operation can easily cause the laser sensor to collide with the tire or rim, leading to detection failure.

[0004] Therefore, how to improve the positioning accuracy of the laser sensor and ensure the smooth progress of the tire eccentricity detection process is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an automatic tire eccentricity measuring device to improve the positioning accuracy of the laser sensor during the tire eccentricity detection process and ensure the smooth progress of the tire eccentricity detection process.

[0006] Another object of the present invention is to provide a measurement method for measuring tire eccentricity using the above-mentioned automatic tire eccentricity measuring device.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An automatic tire eccentricity measuring device includes:

[0009] A tread laser sensor is connected to the first driving component, which drives the tread laser sensor to move in the X (horizontal) and Y (vertical) directions.

[0010] The upper tire side laser sensor and the lower tire side laser sensor are of the same model. The upper tire side laser sensor is driven by a second drive assembly to adjust its position in the X and Y directions. The lower tire side laser sensor is driven by a third drive assembly to adjust its position in the X and Y directions.

[0011] The controller receives model information and detection information of the tread laser sensor, the upper sidewall laser sensor, and the lower sidewall laser sensor, and uses the detection information to position each laser sensor in the XY plane. The controller is electrically connected to the first drive component, the second drive component, and the third drive component to analyze the positioning information and design position of each laser sensor and adjust the position of each laser sensor in the XY plane.

[0012] Preferably, in the above-mentioned automatic tire eccentricity measuring device, the detection information is the distance information between each laser sensor and the tire measured by each laser sensor at the current position.

[0013] Preferably, in the above-mentioned automatic tire eccentricity measuring device, the first drive assembly consists of two drive shafts that are slidably arranged in the horizontal and vertical directions respectively, and the two drive shafts are slidably connected, and the tire tread laser sensor is disposed on either of the drive shafts.

[0014] Preferably, in the above-mentioned automatic tire eccentricity measuring device, the controller is a CPU (central processing unit).

[0015] A method for measuring tire eccentricity, using the automatic tire eccentricity measuring device provided in any of the above embodiments, includes at least the following steps:

[0016] Tire fixing: The tire is clamped onto the rim via the main shaft, and the tire is inflated so that the tire is stably clamped by the main shaft and the rim;

[0017] Adjusting the position of the tread laser sensor: The controller receives the relative position of the tread laser sensor to the tire in the XY plane, measured at its current position, and combines this with the net distance and measurement range information of the tread laser sensor to locate its designed detection position. Simultaneously, it controls the first drive assembly to move the tread laser sensor to its designed detection position. The positioning method of the tread laser sensor in the XY plane is as follows:

[0018]

[0019]

[0020] in:

[0021] Cy is the positioning position of the tread laser sensor on the Y-axis;

[0022] Cx is the positioning position of the tread laser sensor on the X-axis;

[0023] Pcy represents the position of the first drive assembly in the Y direction when the center of the tread laser emission is on the same horizontal plane as the upper end face of the main shaft, in mm.

[0024] Wrt is the test width of the wheel rim, in inches;

[0025] Wrm is the minimum width of the wheel rim, in inches;

[0026] Lrs is the distance from the center of the rim to the upper end face of the spindle when the rim is at its minimum width. It is defined that a positive value is when the center is above the end face, and a negative value is when the center is below the end face. The unit is mm.

[0027] Lx is the distance from the emitting plane of the tread laser sensor to the center of the main shaft when the tread laser sensor returns to zero in the X direction, in mm;

[0028] Rcd is the net distance to the tread laser sensor, in mm;

[0029] Rmr is the measurement range of the tire tread laser sensor, in mm;

[0030] Dt is the tire's outer diameter, in mm;

[0031] Adjusting the position of the upper tire sidewall laser sensor: After completing the positioning calculation of the tread laser sensor, the controller receives the relative positional relationship between the upper tire sidewall laser sensor and the tire in the XY plane, measured at the current position. It then combines this information with the net distance and measurement range information of the upper tire sidewall laser sensor, the positioning information of the tread laser sensor, and the designed detection position of the upper tire sidewall laser sensor to control the second drive assembly to move the upper tire sidewall laser sensor to its designed detection position. The positioning method of the upper tire sidewall laser sensor in the XY plane is as follows:

[0032]

[0033]

[0034] in:

[0035] Ty is the positioning position of the upper tire side laser sensor on the Y-axis;

[0036] Tx is the positioning position of the upper tire side laser sensor on the X-axis;

[0037] Lcd is the net distance to the laser sensor on the upper tire side, in mm;

[0038] Lmr is the measurement range of the laser sensor on the upper tire side, in mm;

[0039] Ws is the tire section width, in mm;

[0040] TCy is the vertical distance between the emission centers of the upper sidewall laser sensor and the tread laser sensor when both the upper sidewall laser sensor and the tread laser sensor are raised to the zero position in the Y direction, in mm;

[0041] Dr is the rim diameter, in inches;

[0042] Sx is the horizontal distance between the emission centers of the upper sidewall laser sensor and the tread laser sensor when both are retracted to the zero position in the X direction, in mm;

[0043] Adjusting the position of the lower tire sidewall laser sensor: After completing the positioning calculations for the tread laser sensor and the upper tire sidewall laser sensor, the controller receives the relative positional relationship between the lower tire sidewall laser sensor and the tire in the XY plane, and controls the third drive assembly to move the lower tire sidewall laser sensor to its designed detection position. The positioning method of the lower tire sidewall laser sensor in the XY plane is as follows:

[0044]

[0045] Bx = Tx;

[0046] in:

[0047] By is the positioning position of the laser sensor on the lower tire side on the Y-axis;

[0048] Bx represents the positioning position of the laser sensor on the lower tire side on the X-axis.

[0049] BCy is the vertical distance between the emission centers of the lower sidewall laser sensor and the tread laser sensor when both the lower sidewall laser sensor and the tread laser sensor are at the zero position in the Y direction, in mm.

[0050] Measurement parameters: After the tread laser sensor, the upper sidewall laser sensor, and the lower sidewall laser sensor are all adjusted to their respective designed detection positions, the main shaft rotates to drive the tire to rotate, and the tread laser sensor, the upper sidewall laser sensor, and the lower sidewall laser sensor cooperate to measure the tire's eccentricity parameter.

[0051] Preferably, in the above method for measuring tire eccentricity, in the steps of adjusting the position of the tread laser sensor, adjusting the position of the upper sidewall laser sensor, and adjusting the position of the lower sidewall laser sensor, in the XY plane, the zero point position in the X direction is the limit position of the tread laser sensor moving away from the tire, and the zero point position in the Y direction is the position of the plane perpendicular to the Y direction and bisects the tire.

[0052] Preferably, in the above method for measuring tire eccentricity, the designed detection positions of the upper tire sidewall laser sensor and the lower tire sidewall laser sensor are symmetrical about the designed detection position of the tread laser sensor.

[0053] As can be seen from the above technical solution, the automatic tire eccentricity measuring device provided by the present invention includes a tread laser sensor, an upper tire sidewall laser sensor, a lower tire sidewall laser sensor, and a controller. The tread laser sensor is used to detect tire tread information and is connected to a first driving assembly. The first driving assembly drives the tread laser sensor to move in the X (horizontal) and Y (vertical) directions, enabling the tread laser sensor to adjust its position in the XY plane. The upper and lower tire sidewall laser sensors are identical sensors, respectively positioned on the upper and lower sides of the tire to detect tire sidewalls from both sides. Regarding the measurement, it should be noted that the upper and lower tire sides specifically refer to the opposite sides of the tire. Correspondingly, the upper tire side laser sensor is connected to the second drive assembly to adjust its position in the X and Y directions, while the lower tire side laser sensor is connected to the third drive assembly to adjust its position in the X and Y directions. The controller receives model information and detection information from the tread laser sensor, upper tire side laser sensor, and lower tire side laser sensor. It then uses this detection information to locate each laser sensor in the XY plane and calculates the designed detection position for each sensor. The controller sets an assumed origin on the XY plane and simultaneously transmits signals to the tire from its current position via the tread laser sensor, upper sidewall laser sensor, and lower sidewall laser sensor. By receiving reflected signals, it determines the left-hand position of these sensors on the XY plane. Furthermore, the controller combines the model information of these sensors to determine their detection range and calculates their optimal detection positions—the designed detection positions. Simultaneously, the controller communicates with the first drive... The first, second, and third drive components are all electrically connected. By controlling the first, second, and third drive components, the laser sensor, upper tire sidewall laser sensor, and lower tire sidewall laser sensor are moved from their current positions to their respective designed detection positions, preparing for the subsequent eccentricity measurement process. The controller realizes the automatic positioning and adjustment of the tread laser sensor, upper tire sidewall laser sensor, and lower tire sidewall laser sensor. Compared with the existing manual adjustment method, this not only improves the positioning accuracy of the laser sensor, but also avoids the laser sensor from colliding with the tire or rim, ensuring the smooth progress of the eccentricity detection process.

[0054] The automatic tire eccentricity measuring device provided by this invention, by setting a controller, determines the motion plane (XY plane) of the tread laser sensor, the upper tire sidewall laser sensor, and the lower tire sidewall laser sensor, and analyzes the reflected signals of the tread laser sensor, the upper tire sidewall laser sensor, and the lower tire sidewall laser sensor relative to the tire surface at their current positions to determine the positioning of the tread laser sensor, the upper tire sidewall laser sensor, and the lower tire sidewall laser sensor in the XY plane. The controller, in conjunction with the model information of each laser sensor, determines its respective designed detection position. By controlling the first drive component, the second drive component, and the third drive component, the automatic adjustment of the positions of the tread laser sensor, the upper tire sidewall laser sensor, and the lower tire sidewall laser sensor is realized. This not only improves the positioning accuracy and adjustment efficiency of the laser sensors, but also avoids the laser sensors from colliding with the tire or rim, ensuring the smooth progress of the eccentricity detection process. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 This is a schematic diagram of the automatic tire eccentricity measuring device provided in an embodiment of the present invention;

[0057] Figure 2 This is a schematic diagram of the detection range of the tire tread laser sensor provided in an embodiment of the present invention;

[0058] Figure 3 This is a schematic diagram of the detection range of the upper tire side laser sensor provided in an embodiment of the present invention;

[0059] Figure 4 This is a schematic diagram of the tire eccentricity measurement method provided in an embodiment of the present invention;

[0060] Among them, 10 is the tread laser sensor, 11 is the first drive assembly, 20 is the upper tire sidewall laser sensor, 21 is the second drive assembly, 30 is the lower tire sidewall laser sensor, 31 is the third drive assembly, 40 is the tire, 50 is the main shaft, and 60 is the rim. Detailed Implementation

[0061] The core of this invention is to disclose an automatic tire eccentricity measuring device, which improves the positioning accuracy of the laser sensor during the tire eccentricity detection process and ensures the smooth progress of the tire eccentricity detection process.

[0062] Another object of the present invention is to provide a measurement method for measuring tire eccentricity using the above-mentioned automatic tire eccentricity measuring device.

[0063] To enable those skilled in the art to better understand the present invention, embodiments of the present invention will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the invention as described in the claims. Additionally, the complete content of the configurations represented in the following embodiments is not limited to those necessary for the solution of the invention as described in the claims.

[0064] like Figure 1 As shown, the automatic tire eccentricity measuring device provided in this embodiment of the invention includes a tread laser sensor 10, an upper tire sidewall laser sensor 20, a lower tire sidewall laser sensor 30, and a controller. The tread laser sensor 10 is used to detect tire tread information and is driven by a first drive assembly 11. The first drive assembly 11 is used to drive the tread laser sensor 10 to move in the X (horizontal) and Y (vertical) directions so that the tread laser sensor 10 can be adjusted in position in the XY plane.

[0065] The upper tire sidewall laser sensor 20 and the lower tire sidewall laser sensor 30 are the same type of sensor, which are respectively set on the upper and lower sides of the tire to detect the tire sidewall from both sides. It should be noted that the upper tire sidewall and the lower tire sidewall specifically refer to the two opposite sides of the tire. Correspondingly, the upper tire sidewall laser sensor 20 is driven to the second drive assembly 21 to realize the position adjustment of the upper tire sidewall laser sensor 20 in the X and Y directions. The lower tire sidewall laser sensor 30 is driven to the third drive assembly 31 to realize the position adjustment of the lower tire sidewall laser sensor 30 in the X and Y directions.

[0066] The controller receives model information and detection information from the tread laser sensor 10, upper sidewall laser sensor 20, and lower sidewall laser sensor 30. It uses this detection information to position each laser sensor on the XY plane and calculates the designed detection position for each sensor. It should be noted that the controller sets an assumed coordinate origin on the XY plane and simultaneously transmits signals from the tread laser sensor 10, upper sidewall laser sensor 20, and lower sidewall laser sensor 30 to the tire at their current positions. By receiving reflected signals, the controller determines the left-hand position of the tread laser sensor 10, upper sidewall laser sensor 20, and lower sidewall laser sensor 30 on the XY plane. Furthermore, the controller combines the model information of the tread laser sensor 10, upper sidewall laser sensor 20, and lower sidewall laser sensor 30 to determine their detection range, and then calculates the detection position of the tread laser sensor 10. 0. The optimal detection positions of the upper tire sidewall laser sensor 20 and the lower tire sidewall laser sensor 30 are determined, i.e., the designed detection positions. Simultaneously, the controller is electrically connected to the first drive assembly 11, the second drive assembly 21, and the third drive assembly 31. By controlling the first drive assembly 11, the second drive assembly 21, and the third drive assembly 31, the laser sensors, the upper tire sidewall laser sensor 20, and the lower tire sidewall laser sensor 30 are moved from their current positions to their respective designed detection positions, preparing for the subsequent eccentricity measurement process. The controller achieves automatic positioning and adjustment of the tread laser sensor 10, the upper tire sidewall laser sensor 20, and the lower tire sidewall laser sensor 30. Compared to the existing manual adjustment method, this not only improves the positioning accuracy of the laser sensors but also avoids collisions between the laser sensors and the tire or rim, ensuring the smooth progress of the eccentricity detection process.

[0067] The automatic tire eccentricity measuring device provided in this embodiment of the invention, by setting a controller, determines the motion plane of the tread laser sensor 10, the upper tire sidewall laser sensor 20, and the lower tire sidewall laser sensor 30, namely the XY plane, and analyzes the reflected signals of the tread laser sensor 10, the upper tire sidewall laser sensor 20, and the lower tire sidewall laser sensor 30 relative to the tire surface at their current positions to determine the positioning of the tread laser sensor 10, the upper tire sidewall laser sensor 20, and the lower tire sidewall laser sensor 30 in the XY plane. The controller, in conjunction with the model information of each laser sensor, determines its respective designed detection position. By controlling the first drive component 11, the second drive component 21, and the third drive component 31, the automatic adjustment of the positions of the tread laser sensor 10, the upper tire sidewall laser sensor 20, and the lower tire sidewall laser sensor 30 is achieved. This not only improves the positioning accuracy and adjustment efficiency of the laser sensors, but also avoids the laser sensors from colliding with the tire or rim, ensuring the smooth progress of the eccentricity detection process.

[0068] It should be noted that the automatic tire eccentricity measuring device provided in this embodiment of the invention only needs to reposition and adjust the tire tread laser sensor 10, the upper tire sidewall laser sensor 20 and the lower tire sidewall laser sensor 30 through the controller when measuring the eccentricity of different tire models. The process is also automatic.

[0069] Furthermore, when the controller determines the position of each laser sensor in the XY plane, the controller determines an assumed coordinate origin and transmits signals to a specific reference object in the XY plane through each laser sensor. The position of each laser sensor in the XY plane can be determined by the reflected signals received by each laser sensor. In a specific embodiment of the present invention, the reference object is the tire to be detected, and the detection information of each laser sensor is the distance information between the laser sensor and the tire measured by the laser sensor at its current position.

[0070] Furthermore, in a specific embodiment of the present invention, the first driving component 11 consists of two driving shafts that are slidably connected. One driving shaft moves in the horizontal direction, and the other driving shaft moves in the vertical direction. The tread laser sensor 10 is mounted on either driving shaft, thereby enabling the tread laser sensor 10 to be adjusted in both the horizontal and vertical directions.

[0071] It should be noted that, for ease of production and installation, in a preferred embodiment of the present invention, the second drive component 21 and the third drive component 31 have the same structure as the first drive component 11.

[0072] Furthermore, in the automatic tire eccentricity measuring device provided in this embodiment of the invention, the controller is a CPU (central processing unit).

[0073] like Figure 4 As shown, the present invention also provides a method for measuring tire eccentricity. This method uses the automatic tire eccentricity measuring device provided in any of the above embodiments to measure tire eccentricity. The method includes at least the following steps:

[0074] S01: Tire fixing: Tire 40 is clamped onto rim 60 via main shaft 50, and tire 40 is inflated so that tire 40 is stably clamped by main shaft 50 and rim 60.

[0075] S02: Adjusting the position of the tread laser sensor: The controller receives the relative position of the tread laser sensor 10 to the tire 40 in the XY plane, measured at its current position, and combines this with the net distance and measurement range information of the tread laser sensor 10 to locate the designed detection position of the tread laser sensor 10. Simultaneously, it controls the first drive assembly 11 to move the tread laser sensor 10 to its designed detection position. The positioning method of the tread laser sensor 10 in the XY plane is as follows:

[0076]

[0077]

[0078] S03: Adjusting the position of the upper tire sidewall laser sensor: After completing the positioning calculation of the tread laser sensor 10, the controller receives the relative positional relationship between the upper tire sidewall laser sensor 20 and the tire 40 in the XY plane, measured at the current position. Combining this with the net distance and measurement range information of the upper tire sidewall laser sensor 20, the positioning information of the tread laser sensor 10, and the designed detection position of the upper tire sidewall laser sensor 20, the controller controls the second drive assembly 21 to move the upper tire sidewall laser sensor 20 to its designed detection position. The positioning method of the upper tire sidewall laser sensor 20 in the XY plane is as follows:

[0079]

[0080]

[0081] S04: Adjusting the position of the lower tire sidewall laser sensor: After completing the positioning calculations for the tread laser sensor 10 and the upper tire sidewall laser sensor 20, the controller receives the relative positional relationship between the lower tire sidewall laser sensor 30 and the tire 40 in the XY plane, and controls the third drive assembly 31 to drive the lower tire sidewall laser sensor 30 to its designed detection position. The positioning method of the lower tire sidewall laser sensor 30 in the XY plane is as follows:

[0082]

[0083] Bx = Tx;

[0084] S05: Measurement parameters: After the tread laser sensor 10, the upper sidewall laser sensor 20 and the lower sidewall laser sensor 30 are all adjusted to their respective designed detection positions, the main shaft 50 rotates to drive the tire 40 to rotate. The tread laser sensor 10, the upper sidewall laser sensor 20 and the lower sidewall laser sensor 30 cooperate to measure the eccentricity parameter of the tire 40.

[0085] It should be noted that in step S02, the parameters in the formula are as follows:

[0086] Cy is the positioning position of the tread laser sensor on the Y-axis;

[0087] Cx is the positioning position of the tread laser sensor on the X-axis;

[0088] Pcy represents the position of the first drive assembly in the Y direction when the center of the tread laser emission is on the same horizontal plane as the upper end face of the main shaft, in mm.

[0089] Wrt is the test width of the wheel rim, in inches;

[0090] Wrm is the minimum width of the wheel rim, in inches;

[0091] Lrs is the distance from the center of the rim to the upper end face of the spindle when the rim is at its minimum width. It is defined that a positive value is when the center is above the end face, and a negative value is when the center is below the end face. The unit is mm.

[0092] Lx is the distance from the emitting plane of the tread laser sensor to the center of the main shaft when the tread laser sensor returns to zero in the X direction, in mm;

[0093] Rcd is the net distance to the tread laser sensor, in mm;

[0094] Rmr is the measurement range of the tire tread laser sensor, in mm;

[0095] Dt is the tire's outer diameter, in mm;

[0096] Furthermore, in step S03, the parameters in the formula are as follows:

[0097] Ty is the positioning position of the upper tire side laser sensor on the Y-axis;

[0098] Tx is the positioning position of the upper tire side laser sensor on the X-axis;

[0099] Lcd is the net distance to the laser sensor on the upper tire side, in mm;

[0100] Lmr is the measurement range of the laser sensor on the upper tire side, in mm;

[0101] Ws is the tire section width, in mm;

[0102] TCy is the vertical distance between the emission centers of the upper sidewall laser sensor and the tread laser sensor when both the upper sidewall laser sensor and the tread laser sensor are raised to the zero position in the Y direction, in mm;

[0103] Dr is the rim diameter, in inches;

[0104] Sx is the horizontal distance between the emission centers of the upper sidewall laser sensor and the tread laser sensor when both are retracted to the zero position in the X direction, in mm;

[0105] Furthermore, in step S04, the parameters in the formula are as follows:

[0106] By is the positioning position of the laser sensor on the lower tire side on the Y-axis;

[0107] Bx represents the positioning position of the laser sensor on the lower tire side on the X-axis.

[0108] BCy is the vertical distance between the emission centers of the lower sidewall laser sensor and the tread laser sensor when both the lower sidewall laser sensor and the tread laser sensor are at the zero position in the Y direction, in mm.

[0109] It should be noted that the detection static distance and detection range of the tread laser sensor 10, the upper sidewall laser sensor 20, and the lower sidewall laser sensor 20 are shown in the diagram below. Figure 2 and Figure 3 As shown.

[0110] Furthermore, since the positions of the tread laser sensor 10, the upper sidewall laser sensor 20, and the lower sidewall laser sensor 30 in the XY plane are determined by relative positions, that is, the controller can arbitrarily set the zero point position in the X direction and the zero point position in the Y direction in the XY plane. For ease of identification, in a preferred embodiment of the present invention, in the steps of adjusting the position of the tread laser sensor, adjusting the position of the upper sidewall laser sensor, and adjusting the position of the lower sidewall laser sensor, the zero point position in the X direction in the XY plane is the limit position of the tread laser sensor 10 moving away from the tire 40, and the zero point position in the Y direction is the position of the plane perpendicular to the Y direction and bisects the tire 40.

[0111] Furthermore, in order to uniformly detect the eccentricity data on both sides of the tire 40, in a preferred embodiment of the present invention, the design detection positions of the upper tire side laser sensor 20 and the lower tire side laser sensor 30 are symmetrical about the design detection position of the tread laser sensor 10.

[0112] The terms "first" and "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed.

[0113] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of measuring tire eccentricity, characterized by, The measurement is performed using an automatic tire eccentricity measuring device, which includes: The tread laser sensor (10) is connected to the first drive assembly (11) for driving the tread laser sensor (10) to move in the X and Y directions; The upper tire side laser sensor (20) and the lower tire side laser sensor (30) are of the same model. The upper tire side laser sensor (20) is connected to the second drive assembly (21) for position adjustment in the X and Y directions. The lower tire side laser sensor (30) is connected to the third drive assembly (31) for position adjustment in the X and Y directions. The controller receives the model information and detection information of the tread laser sensor (10), the upper sidewall laser sensor (20) and the lower sidewall laser sensor (30), and positions each laser sensor on the XY plane using the detection information. The controller is electrically connected to the first drive component (11), the second drive component (21) and the third drive component (31) to analyze the positioning information and design position of each laser sensor and adjust the position of each laser sensor on the XY plane. The method for measuring tire eccentricity includes at least the following steps: Tire fixing: The tire (40) is clamped onto the rim (60) by the main shaft (50) and the tire (40) is inflated so that the tire (40) is stably clamped by the main shaft (50) and the rim (60); Adjusting the position of the tread laser sensor: The controller receives the relative positional relationship between the tread laser sensor (10) and the tire (40) in the XY plane measured at the current position, and combines the net measurement distance and measurement range information of the tread laser sensor (10) to locate the designed detection position of the tread laser sensor (10). At the same time, it controls the first drive component (11) to drive the tread laser sensor (10) to move to its designed detection position. The positioning method of the tread laser sensor (10) in the XY plane is as follows: ； ； in: Positioning position of the tread laser sensor on the Y axis; Positioning position of the tread laser sensor on the X axis; Y0 is the position of the first driving assembly in Y direction when the laser emission center of the tire tread and the upper end surface of the main shaft are in the same horizontal plane, unit: mm; Test Width for Rim, in inches; Rmin is the minimum width of the rim, in inches; Distance from the center of the rim to the upper end face of the main shaft when the rim is at the minimum width. The distance is positive if the center is above the end face and negative if the center is below the end face. Unit: mm. The distance from the emitting plane of the tread laser sensor to the center of the main shaft when the tread laser sensor returns to zero in the X direction is expressed in mm. net distance for the tread laser sensor, in mm; Measurement range of the tread laser sensor, in mm; R is the outside diameter of the tire, in mm; Adjusting the position of the upper tire sidewall laser sensor: After completing the positioning calculation of the tread laser sensor (10), the controller receives the relative positional relationship between the upper tire sidewall laser sensor (20) and the tire (40) in the XY plane measured at the current position, and combines the net distance and measurement range information measured by the upper tire sidewall laser sensor (20), the positioning information of the tread laser sensor (10), and the designed detection position of the upper tire sidewall laser sensor (20) to control the second drive component (21) to drive the upper tire sidewall laser sensor (20) to move to its designed detection position. The positioning method of the upper tire sidewall laser sensor (20) in the XY plane is as follows: ； ； in: Positioning position of the upper sidewall laser sensor on the Y axis; Positioning position of the upper sidewall laser sensor in the X axis; net distance for the upper sidewall laser sensor, in mm; Measurement range of the upper sidewall laser sensor, in mm; T is the tire cross-sectional width, in mm; The vertical distance between the emission center of the upper sidewall laser sensor and the upper sidewall laser sensor when both the upper sidewall laser sensor and the tread laser sensor are raised to the zero position in the Y direction, in units of mm; R is the rim diameter in inches; the horizontal distance between the emission centers of the upper sidewall laser sensor and the tread laser sensor when both are retracted to the zero position in the X direction, in mm; Adjusting the position of the lower tire sidewall laser sensor: After completing the positioning calculation of the tread laser sensor (10) and the upper tire sidewall laser sensor (20), the controller receives the relative positional relationship between the lower tire sidewall laser sensor (30) and the tire (40) in the XY plane, and controls the third drive assembly (31) to drive the lower tire sidewall laser sensor (30) to its designed detection position. The positioning method of the lower tire sidewall laser sensor (30) in the XY plane is as follows: ； ； in: Positioning position of lower side laser sensor on Y axis; Positioning position of the lower side laser sensor in the X axis; The vertical distance between the emission center of the lower sidewall laser sensor and the tire face laser sensor when the present sidewall laser sensor and the tire face laser sensor are both raised to the zero position in the Y direction, in units of mm; Measurement parameters: After the tread laser sensor (10), the upper sidewall laser sensor (20) and the lower sidewall laser sensor (30) are all adjusted to their respective designed detection positions, the main shaft (50) rotates to drive the tire (40) to rotate. The tread laser sensor (10), the upper sidewall laser sensor (20) and the lower sidewall laser sensor (30) cooperate to measure the eccentricity parameter of the tire (40).

2. The method of measuring tire eccentricity as defined in claim 1, wherein, In the steps of adjusting the position of the tread laser sensor, adjusting the position of the upper sidewall laser sensor, and adjusting the position of the lower sidewall laser sensor, in the XY plane, the zero point position in the X direction is the limit position of the movement of the tread laser sensor (10) away from the tire (40), and the zero point position in the Y direction is the position of the plane that is perpendicular to the Y direction and bisects the tire (40).

3. The method of measuring tire eccentricity as defined in claim 1, wherein, The designed detection positions of the upper tire side laser sensor (20) and the lower tire side laser sensor (30) are symmetrical about the designed detection position of the tread laser sensor (10).

4. The method of measuring tire eccentricity as defined in claim 1, wherein, The detection information refers to the distance information between each laser sensor and the tire, measured by each laser sensor at its current position.

5. The method of measuring tire eccentricity as defined in claim 1, wherein, The first drive assembly (11) consists of two drive shafts that are slidably arranged in the horizontal and vertical directions respectively, and the two drive shafts are slidably connected. The tread laser sensor (10) is disposed on either of the drive shafts.

6. The method of measuring tire eccentricity as defined in claim 1, wherein, The controller is a CPU.

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