Method and device for measuring the amount of deviation of the center line of a tire capsule

Abstract

The application discloses a kind of measurement method and measuring device of tire capsule center line skew amount, including placing tire to be measured, make its axis with first direction parallel;Along the first direction, the initial position of the indicating mark along the first direction is set as reference zero point, by moving preset indicating mark, make it with the one side edge of the capsule center line in the tire inner align, and again;Under the condition that the relative position of tire and indicating mark in the plane perpendicular to first direction is unchanged, tire is turned over;Again, the indicating mark is moved along the first direction, make it with the same side edge of the capsule center line in the tire inner after turning over align;The displacement value of indicating mark relative to reference zero point in the first direction is obtained at this time, take the absolute value of the value as the capsule center line skew amount of tire at current measurement position, half.This application converts arc length measurement into height difference measurement, easy to operate, without positioning tire center, direct reading, greatly improve measurement efficiency and accuracy.

Description

Technical Field

[0001] This invention relates to the field of tire processing and inspection technology, and in particular to a method and device for measuring the deviation of the centerline of a tire bladder. Background Technology

[0002] Tires are annular, elastic rubber products that are mounted on various vehicles or machinery and roll on the ground. They are typically mounted on metal rims, supporting the vehicle body, cushioning external impacts, ensuring contact with the road surface, and guaranteeing vehicle performance. The main manufacturing processes of tires include: mixing, preparation, molding, and vulcanization. After vulcanization, tires undergo inspection and other processes to finally become qualified finished tires.

[0003] Tire vulcanization is the final and one of the most critical processes in tire manufacturing. Essentially, it involves placing the shaped, soft "green tire" into a high-temperature, high-pressure mold, where a chemical reaction (vulcanization) transforms it into a "cured tire" with a fixed shape that is tough and wear-resistant.

[0004] During the entire vulcanization process, the tire blank is loaded into the vulcanizing machine by a robotic arm, then shaped and fixed by a bladder, and finally the vulcanizing machine closes for vulcanization. Axially, the geometric center axis of the tire blank coincides with the expansion center axis of the bladder and the cavity center axis of the mold. Simultaneously, radially, the centerline of the bladder should also coincide as much as possible with the centerline of the tire blank to minimize the deviation of the tire's inner centerline. This ensures that during vulcanization, heat transfer and stress distribution through the bladder to the upper and lower molds of the tire are uniform and symmetrical. Especially for low-profile and high-profile tires, excessive deviation of the bladder centerline can easily lead to bending of the tire carcass cords, requiring strict control.

[0005] In existing technologies, the measurement of capsule centerline deviation mainly has the following problems: Traditional measurement methods use a flat measuring tape, where a person manually aligns it with the tire's inner contour along the tire's cross-section, measuring the arc length from the center line of the tire's bladder to both tire toes. The deviation is then calculated by taking half the difference between the upper and lower arc lengths. This method is cumbersome; a single person cannot guarantee that the measuring tape will perfectly align with the inner contour over long distances, requiring two people to assist, resulting in low efficiency and high labor costs. Furthermore, manual operation makes it difficult to ensure the measurement path strictly follows the tire's radial direction, easily leading to measurement errors.

[0006] Another existing technical solution, such as the capsule centerline measuring device disclosed in patent CN201620788520.8, determines the deviation by comparing whether the center of the outer tread of the tire and the centerline of the inner capsule move synchronously. However, this device can only qualitatively determine whether there is deviation, and cannot quantify the amount of deviation. In addition, when the tire tread has no center color line or has an asymmetrical pattern, it is difficult to locate the tread center, making this method unsuitable. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art. To achieve the above objective, a method and device for measuring the centerline deviation of a tire bladder are provided to solve the problems mentioned in the background art.

[0008] The first aspect provides a technical solution: a method for measuring the centerline deviation of a tire bladder, comprising the following steps: Place the tire to be tested so that its axis is parallel to the first direction; Move the preset indicator mark along the first direction to align it with one side edge of the center line of the bladder inside the tire, and set the initial position of the indicator mark along the first direction as the reference zero point; While keeping the relative positions of the tire and the indicator mark unchanged in a plane perpendicular to the first direction, the tire is flipped over; Move the indicator mark again along the first direction so that it is aligned with the same side edge of the center line of the capsule inside the overturned tire lining; Obtain the displacement value of the indicator mark relative to the reference zero point in the first direction at this time, and take half of the absolute value of the value as the deviation of the tire's capsule centerline at the current measurement position.

[0009] As a further aspect of the present invention, it also includes: The tire or the indicator mark is rotated relative to each other in a plane perpendicular to the first direction to at least one other circumferential measurement position. The subsequent steps are repeated to obtain the capsule centerline deviation at multiple circumferential measurement positions.

[0010] As a further aspect of the present invention: the arithmetic mean of the bladder centerline deviation at the plurality of circumferential measurement positions is calculated as the final bladder centerline deviation of the tire.

[0011] As a further aspect of the invention: the indicator mark is provided by a height gauge and a laser emitter mounted on the height gauge; The step of moving the indicator mark along the first direction specifically involves: moving the laser emitter along the scale direction of the height scale so that the laser indicator line emitted by it is aligned with one edge of the capsule center line; The step of setting the initial position of the indicator mark to the reference zero point specifically involves: clearing the current reading of the height gauge to zero.

[0012] As a further aspect of the present invention: the height gauge is a digital height gauge, and the step of setting the reference zero point is achieved through the zeroing function of the digital height gauge.

[0013] As a further aspect of the present invention: the laser emitter is a cross-shaped laser emitter, the horizontal laser indicator line emitted by the cross-shaped laser emitter is used to align one side edge of the capsule's center line, and the vertical laser indicator line emitted by the cross-shaped laser emitter is used to calibrate the measurement direction.

[0014] As a further aspect of the invention: before aligning the indicator mark with one edge of the capsule's center line, the method further includes: The cross laser emitter is calibrated using a fine-tuning device so that the horizontal and vertical laser indicator lines it emits are in a horizontal and vertical state, respectively.

[0015] As a further aspect of the present invention: the laser indicator line emitted by the laser emitter is a straight line laser line.

[0016] As a further aspect of the present invention: the tire is placed on a measuring platform, the measuring platform having an inner ring and an outer ring that can rotate relative to each other; The measurement position can be changed while keeping the radial relative position of the tire and the indicator mark unchanged by rotating the outer ring to drive the tire to rotate, or by rotating the inner ring to drive the indicator mark to rotate.

[0017] The second aspect provides a technical solution as follows: a measuring device employing a method for measuring the centerline deviation of a tire bladder as described in any of the above claims, comprising: A measuring platform, comprising a first platform and a second platform, the first platform and the second platform being concentrically arranged and capable of rotating relative to each other, the first platform being used to support the tire to be tested, and the second platform being used to place measuring tools. Measuring tools, the measuring tools including: A height gauge, comprising a base, a scale vertically mounted on the base, and a digital display slidably fitted to the scale, the digital display being able to move along the scale and display the displacement value in real time; A laser emitter is fixed to the digital display of the height gauge by a clamping device, so that the laser emitter can move synchronously with the digital display along the scale; the laser emitter is used to emit an indicator line to locate the edge of the center line of the bladder inside the tire.

[0018] Compared with the prior art, the present invention has the following technical advantages: Using the above technical solution, the tire to be tested is placed with its axis parallel to a first direction; an indicator mark is moved along the first direction until it aligns with one edge of the center line of the tire's inner bladder, and this position is set as the reference zero point; then, while keeping the radial relative position between the tire and the indicator mark unchanged, the tire is flipped over, and the indicator mark is moved again along the first direction until it aligns with the same edge of the bladder's center line; the displacement value of the indicator mark relative to the reference zero point in the first direction is obtained, and half of this absolute value is taken as the deviation. This method transforms the traditional indirect method that relies on measuring the inner bladder arc length into a direct method that only requires measuring the height difference along the axial direction. It eliminates the need to locate the inner bladder center, simplifies operation, and provides results with a single reading, significantly improving measurement efficiency and accuracy.

[0019] First, it creatively transforms the complex measurement of the inner contour arc length of the tire lining into a simple measurement of the height difference along the axial direction, eliminating the traditional requirement of strictly adhering to the inner contour along the tire cross-section. This can be completed by a single person, making it convenient and efficient. Second, it eliminates the need to find and locate the physical center of the tire lining or the center line of the tread, using only the edge of the bladder center line imprint as a reference, thus broadening its applicability and making it equally effective for tires with asymmetrical tread patterns and those without a center color line. Third, by rotating the tire twice to locate the same edge and directly reading the height difference, it avoids the accumulation of errors caused by the subtraction of arc lengths, resulting in accurate and intuitive measurement results. Attached Figure Description

[0020] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings: Figure 1 This is a flowchart of a method according to an embodiment of this application; Figure 2 This is a side view of the novel capsule centerline measuring device according to an embodiment of this application; Figure 3 This is a front view of the measurement platform according to an embodiment of this application; Figure 4 This is a schematic diagram of a novel capsule centerline measuring tool according to an embodiment of this application; Figure 5 This is a schematic diagram of the emission of a "cross laser" according to an embodiment of this application; Figure 6 This is a schematic diagram of the deviation of the tire centerline in an embodiment of this application (arc length measurement method). Figure 7 This is a schematic diagram of the measuring device according to an embodiment of this application; Figure 8 This is a schematic diagram illustrating another method of inner ring rotation according to an embodiment of this application. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please refer to Figure 1 In an embodiment of the technical solution provided in the first aspect of the present invention, a method for measuring the deviation of the centerline of a tire bladder includes the following steps: Step S1: Place the tire to be tested, ensuring its axis is parallel to the first direction; Step S2: Move the preset indicator mark along the first direction, specifically: move the laser emitter along the scale direction of the height gauge so that the laser indicator line emitted by it is aligned with one side edge of the capsule center line, and so that it is aligned with one side edge of the capsule center line inside the tire, and set the initial position of the indicator mark along the first direction as the reference zero point, specifically: clear the current reading of the height gauge to zero. Step S3: While keeping the relative position of the tire and the indicator mark unchanged in a plane perpendicular to the first direction, flip the tire over; Step S4: Move the indicator mark again along the first direction so that it is aligned with the same side edge of the center line of the capsule inside the overturned tire lining; Step S5: Obtain the displacement value of the indicator mark relative to the reference zero point in the first direction at this time, and take half of the absolute value of the value as the deviation of the tire's capsule centerline at the current measurement position.

[0023] This embodiment also includes: The tire or the indicator mark is rotated relative to each other in a plane perpendicular to the first direction to at least one other circumferential measurement position. The subsequent steps are repeated to obtain the capsule centerline deviation at multiple circumferential measurement positions.

[0024] In this embodiment, the arithmetic mean of the bladder centerline deviation at the plurality of circumferential measurement positions is calculated as the final bladder centerline deviation of the tire.

[0025] In this embodiment, the indicator mark is provided by a height gauge and a laser emitter mounted on the height gauge; In this embodiment, the height gauge is a digital height gauge, and the step of setting the reference zero point is achieved through the zeroing function of the digital height gauge.

[0026] In this embodiment, the laser emitter is a cross-shaped laser emitter. The horizontal laser indicator line emitted by the cross-shaped laser emitter is used to align one edge of the capsule's center line, and the vertical laser indicator line emitted by the cross-shaped laser emitter is used to calibrate the measurement direction.

[0027] In this embodiment, before aligning the indicator mark with one edge of the capsule's center line, the method further includes: The cross laser emitter is calibrated using a fine-tuning device so that the horizontal and vertical laser indicator lines it emits are in a horizontal and vertical state, respectively.

[0028] In this embodiment, the laser indicator line emitted by the laser emitter is a cross-shaped laser line. In another optional embodiment, the laser indicator line emitted by the laser emitter is a straight laser line.

[0029] In this embodiment, the tire is placed on a measuring platform, and the measuring platform has an inner ring and an outer ring that can rotate relative to each other; The measurement position can be changed while keeping the radial relative position of the tire and the indicator mark unchanged by rotating the outer ring to drive the tire to rotate, or by rotating the inner ring to drive the indicator mark to rotate.

[0030] The second aspect provides a technical solution as follows: a measuring device employing a method for measuring the centerline deviation of a tire bladder as described in any of the above claims, comprising: A measuring platform, comprising a first platform and a second platform, the first platform and the second platform being concentrically arranged and capable of rotating relative to each other, the first platform being used to support the tire to be tested, and the second platform being used to place measuring tools. Measuring tools, the measuring tools including: A height gauge, comprising a base, a scale vertically mounted on the base, and a digital display slidably fitted to the scale, the digital display being able to move along the scale and display the displacement value in real time; A laser emitter is fixed to the digital display of the height gauge by a clamping device, so that the laser emitter can move synchronously with the digital display along the scale; the laser emitter is used to emit an indicator line to locate the edge of the center line of the bladder inside the tire.

[0031] In this embodiment, the measuring device includes a measuring platform and measuring tools.

[0032] like Figure 2 and Figure 3As shown, the measuring platform includes several support brackets, each a frame structure composed of a circular platform and vertical rods. Two concentric annular platforms of different sizes are positioned at the upper end of the support brackets, designated as the first platform and the second platform. The first platform is the outer annular platform, and the second platform is the inner annular platform. The inner annular platform is fixed and used to hold the measuring tool; the outer annular platform can rotate circumferentially to support the tire being measured. The inner and outer annular platforms are connected by several support crossbars and several circumferentially distributed ball bearing tracks. The ball bearing tracks contain ball bearings with retainers, allowing the outer annular platform to rotate smoothly relative to the inner annular platform. In another optional embodiment, the first platform is the inner annular platform, and the second platform is the outer annular platform; that is, the inner annular platform can rotate to hold the measuring tool, while the outer annular platform is fixed to hold the tire. Both the first and second platforms are located on the same horizontal plane to ensure a consistent measurement reference.

[0033] like Figure 4 As shown, the measuring tool includes a digital height gauge, a laser emitter, and a set of clamping devices. The digital height gauge includes a base, a scale vertically mounted on the base, and a digital display that slides onto the scale. The digital display integrates a high-precision displacement sensor, which can move up and down along the scale and display the displacement value in real time, with a measurement accuracy of up to 0.01 mm. The digital display has a zeroing function; pressing the zeroing button will reset the displayed value to zero regardless of the current position of the digital display on the scale. One end of the digital display is equipped with a measuring jaw, which is fixedly connected to the laser emitter via the clamping devices, allowing the laser emitter to move synchronously with the digital display along the scale.

[0034] In this embodiment, the laser emitter is a cross-shaped laser emitter, and the emitted laser line is cross-shaped, including a horizontal laser indicator line and a vertical laser indicator line, such as... Figure 5 As shown. The laser emitter is also equipped with a fine-tuning device, which is used to calibrate the laser emitter's attitude before initial installation or use. Through adjustment mechanisms such as knobs, it can be ensured that the horizontal and vertical laser indicator lines emitted by the cross laser emitter are absolutely horizontal and absolutely vertical, respectively. After calibration, the horizontal laser indicator line is parallel to the bearing surface of the measuring platform, and the vertical laser indicator line is parallel to the direction of movement of the digital height gauge. The type of laser emitter is not limited to a cross laser; in another optional embodiment, a single-line laser emitter can also be used, emitting only one horizontal laser indicator line.

[0035] Example 2 In this embodiment, the complete steps of the measurement method of this embodiment are performed using the aforementioned measuring device. For ease of description, in this embodiment, the "first direction" is specifically defined as the vertical direction, that is, the tire is placed horizontally with its axis parallel to the vertical direction.

[0036] Step 1: Preparation. Place the tire to be tested horizontally on the outer ring platform of the measuring platform, ensuring the tire's axis is perpendicular to the horizontal plane, i.e., parallel to the vertical direction. Place the measuring tool on the inner ring platform of the measuring platform and adjust the base position so that the laser emitter is roughly aligned with the inner wall of the tire. Turn on the power to the laser emitter and use the fine-tuning device to confirm and calibrate that the crosshair laser lines are horizontal and vertical.

[0037] Step Two: Initial Positioning and Zeroing. Move the digital display up and down along the scale direction (i.e., the first direction or the vertical direction), causing the laser emitter to move synchronously. When the horizontal laser indicator line emitted by the laser emitter precisely coincides with the upper edge of the center line of the bladder inside the tire, stop moving the digital display. At this point, press the zeroing button on the digital display to set the current position of the laser emitter as the reference zero point, and the displayed value of the digital display will return to zero. Here, the upper and lower edges of the bladder center line are defined according to the flat posture of the tire. Choosing the upper edge as the alignment reference only requires ensuring consistency before and after flipping. In another embodiment, the lower edge of the bladder center line can also be chosen as the alignment reference.

[0038] Step 3: Flip the tire. While maintaining the relative positions of the measuring tool and the tire in a plane perpendicular to the first direction (i.e., a horizontal plane), flip the tire radially so that the side that was originally facing down is now facing up. Since the measuring tool is placed on a fixed inner ring platform and the tire is placed on a rotatable outer ring platform, when manually flipping the tire, the operator only needs to ensure that the position of the measuring tool is not moved.

[0039] Step 4: Second Positioning and Reading. Move the digital display again along the scale, causing the laser emitter to move up and down, so that the horizontal laser indicator line precisely coincides with the same side edge (still the upper edge) of the center line of the bladder inside the overturned tire. At this time, the value displayed on the digital display is the vertical displacement of the second alignment position relative to the zero point of the first alignment reference.

[0040] Step 5: Calculation of Deviation. Based on geometric relationships, the deviation of the tire's bladder centerline at the current circumferential measurement position is equal to half the absolute value of the displacement. The operator can obtain the result directly through mental calculation or with the aid of a calculation tool.

[0041] To further improve the representativeness and accuracy of the measurement results, the method of this invention may also include a multi-point measurement step. After completing the measurement at the first circumferential measurement position, the outer ring platform of the measuring platform is rotated, causing the tire to rotate circumferentially in the horizontal plane by a certain angle, such as 120 degrees, to reach the second circumferential measurement position. In another embodiment, the inner ring platform can also be rotated to rotate the measuring tool by the same angle, which can also achieve the purpose of changing the circumferential measurement position. At the new measurement position, steps two to five above are repeated to obtain the deviation at that position. The measurement is repeated again to the third circumferential measurement position to obtain the corresponding deviation. Finally, the arithmetic mean of the deviations at the three positions is calculated as the final bladder centerline deviation of the tire. Usually, three circumferentially evenly distributed positions are selected for measurement, but the number of measurement positions is not limited to this.

[0042] like Figure 6 As shown in the figure, the diagram illustrates the deviation of the tire's center line (by measuring arc length). like Figure 7 As shown, the diagram illustrates the measurement process using the measuring device. In this embodiment, another measurement platform implementation method can also be used. For example... Figure 8 As shown, unlike the scheme in Embodiment 1 where the outer ring rotates and the inner ring is fixed, in this embodiment, the inner ring platform of the measuring platform is a rotatable part, and the outer ring platform is a fixed part. During measurement, the tire is placed on the fixed outer ring platform, and the measuring tool is placed on the rotatable inner ring platform. When it is necessary to change the circumferential measurement position, the tire is not rotated; instead, the measuring tool on the inner ring platform is rotated to the target position. The remaining measurement steps are exactly the same as in Embodiment 1.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of the invention is defined by the appended claims and their equivalents, all of which should be included within the scope of protection of the invention.

Claims

1. A method for measuring the deviation of the centerline of a tire bladder, characterized in that, Includes the following steps: Place the tire to be tested so that its axis is parallel to the first direction; Move the preset indicator mark along the first direction to align it with one side edge of the center line of the bladder inside the tire, and set the initial position of the indicator mark along the first direction as the reference zero point; While keeping the relative positions of the tire and the indicator mark unchanged in a plane perpendicular to the first direction, the tire is flipped over; Move the indicator mark again along the first direction so that it is aligned with the same side edge of the center line of the capsule inside the overturned tire lining; Obtain the displacement value of the indicator mark relative to the reference zero point in the first direction at this time, and take half of the absolute value of the value as the deviation of the tire's capsule centerline at the current measurement position.

2. The method for measuring the centerline deviation of a tire bladder according to claim 1, characterized in that, Also includes: The tire or the indicator mark is rotated relative to each other in a plane perpendicular to the first direction to at least one other circumferential measurement position. The subsequent steps are repeated to obtain the capsule centerline deviation at multiple circumferential measurement positions.

3. The method for measuring the centerline deviation of a tire bladder according to claim 2, characterized in that, The arithmetic mean of the bladder centerline deviation at the multiple circumferential measurement positions is calculated as the final bladder centerline deviation of the tire.

4. The method for measuring the centerline deviation of a tire bladder according to claim 1, characterized in that, The indicator markers are provided by a height gauge and a laser emitter mounted on the height gauge; The step of moving the indicator mark along the first direction specifically involves: moving the laser emitter along the scale direction of the height scale so that the laser indicator line emitted by it is aligned with one edge of the capsule center line; The step of setting the initial position of the indicator mark to the reference zero point specifically involves: clearing the current reading of the height gauge to zero.

5. The method for measuring the centerline deviation of a tire bladder according to claim 4, characterized in that, The height gauge is a digital height gauge, and the step of setting the reference zero point is achieved through the zeroing function of the digital height gauge.

6. The method for measuring the centerline deviation of a tire bladder according to claim 4, characterized in that, The laser emitter is a cross-shaped laser emitter. The horizontal laser indicator line emitted by the cross-shaped laser emitter is used to align one edge of the capsule's center line, and the vertical laser indicator line emitted by the cross-shaped laser emitter is used to calibrate the measurement direction.

7. The method for measuring the centerline deviation of a tire bladder according to claim 6, characterized in that, Before aligning the indicator mark with one edge of the capsule's center line, the process further includes: The cross laser emitter is calibrated using a fine-tuning device so that the horizontal and vertical laser indicator lines it emits are in a horizontal and vertical state, respectively.

8. The method for measuring the centerline deviation of a tire bladder according to claim 7, characterized in that, The laser indicator line emitted by the laser emitter is a straight line.

9. The method for measuring the centerline deviation of a tire bladder according to claim 1, characterized in that, The tire is placed on a measuring platform, which has an inner ring and an outer ring that can rotate relative to each other; The measurement position can be changed while keeping the radial relative position of the tire and the indicator mark unchanged by rotating the outer ring to drive the tire to rotate, or by rotating the inner ring to drive the indicator mark to rotate.

10. A measuring device employing the method for measuring the centerline deviation of a tire bladder as described in any one of claims 1 to 9, characterized in that, include: A measuring platform, comprising a first platform and a second platform, the first platform and the second platform being concentrically arranged and capable of rotating relative to each other, the first platform being used to support the tire to be tested, and the second platform being used to place measuring tools. Measuring tools, the measuring tools including: A height gauge, comprising a base, a scale vertically mounted on the base, and a digital display slidably fitted to the scale, the digital display being able to move along the scale and display the displacement value in real time; A laser emitter is fixed to the digital display of the height gauge by a clamping device, so that the laser emitter can move synchronously with the digital display along the scale; the laser emitter is used to emit an indicator line to locate the edge of the center line of the bladder inside the tire.

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