Method and device for drawing tire cross section

Abstract

The present invention relates to the field of tires, and more particularly to a method and device for drawing a tire cross-section, comprising the following steps: preparing a tire cross-section, fixing the tire cross-section horizontally on a preset measuring platform with the graphic outline of the tire cross-section facing vertically upward; establishing a horizontal coordinate system on the measuring platform; S2, adjusting the horizontal position of a laser point finder mounted above the measuring platform along the graphic outline of the tire cross-section, obtaining and recording the corresponding coordinate values in the horizontal coordinate system when the laser point finder is located on the graphic outline of the tire cross-section; S3, if the number of recorded coordinate values reaches a preset threshold, drawing the corresponding graphic outline based on the obtained coordinate values and saving it as a drawing file. The drawing process is efficient, the drawn file has small errors, and high accuracy.

Description

Technical Field

[0001] The present invention relates to the field of tires, and in particular to a method and device for drawing a tire section. Background Art

[0002] Tire cross-sections are cut from finished tires and are one of the most critical methods in the technical research and development and production control processes of finished tires. The measurement of dissected tire cross-sections requires high technical standards, especially in terms of measurement accuracy. Traditional methods for drawing giant tire cross-sections include the following: 1. Taking cross-section images with a mobile phone or camera and placing them in CAD. However, due to the camera's shooting angle, the cross-section dimensions and curves are distorted, resulting in poor data accuracy and a low rate of final data acceptance. 2. Manually drawing drawings using grid paper is time-consuming and requires manual data entry into Excel spreadsheets and then importing into CAD drawings. This results in low efficiency and a drawing cycle of up to 15-30 days. 3. Measuring the tire cross-section, however, can easily shift during the measurement process, causing invalid measurement data and technical misjudgments. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a tire cross-section drawing method and a drawing device, which can realize the drawing of the tire cross-section.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A method for drawing a tire cross section is provided, comprising the following steps:

[0006] S1. Prepare a tire section and fix the tire section horizontally on a preset measuring platform with the outline of the tire section facing vertically upward; a horizontal coordinate system is established on the measuring platform;

[0007] S2. Adjusting the horizontal position of a laser point finder mounted on the measuring platform along the graphic contour of the tire cross section, and obtaining and recording corresponding coordinate values in the horizontal coordinate system when the laser point finder is located on the graphic contour of the tire cross section;

[0008] S3. If the number of the recorded coordinate values reaches a preset threshold, a corresponding graphic outline is drawn according to the obtained coordinate values and saved as a drawing file.

[0009] Another technical solution adopted in the present invention is:

[0010] A tire cross-section drawing device includes a processor, a laser point finder and a measuring platform. A horizontal coordinate system is built on the measuring platform. The measuring platform is provided with a first adjustment mechanism that can move along a horizontal direction corresponding to the position of the horizontal coordinate system. The first adjustment mechanism is provided with a second adjustment mechanism that can move along another horizontal direction. The one horizontal direction is perpendicular to the other horizontal direction. The laser point finder is arranged on the second adjustment mechanism and the laser point finder is arranged vertically downward. The position of the laser point finder on the horizontal plane is associated with the position on the horizontal coordinate system. The laser point finder establishes a communication connection with the processor.

[0011] The present invention provides a tire cross-section drawing method and device. Using a laser point finder, the coordinate values corresponding to the horizontal coordinate system of the corresponding graphic outline on the tire cross-section are obtained. This method is highly accurate and efficient, changing traditional manual measurement methods and meeting the cross-section measurement needs of technological research and development. Furthermore, the corresponding graphic outline is drawn based on the obtained coordinate values and saved as a drawing file. This process is efficient, the drawn file has minimal errors, and high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A flowchart of a tire cross-section drawing method according to the present invention;

[0013] Figure 2 It is a structural schematic diagram of a tire cross-section drawing device of the present invention;

[0014] Description of labels:

[0015] 1. Laser point finder;

[0016] 2. Measuring platform; 21. First adjustment mechanism; 22. Second adjustment mechanism. DETAILED DESCRIPTION

[0017] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0018] Please refer to Figure 1 ,

[0019] A method for drawing a tire cross section is provided, comprising the following steps:

[0020] S1. Prepare a tire section and fix the tire section horizontally on a preset measuring platform with the outline of the tire section facing vertically upward; a horizontal coordinate system is established on the measuring platform;

[0021] S2. Adjusting the horizontal position of a laser point finder mounted on the measuring platform along the graphic contour of the tire cross section, and obtaining and recording corresponding coordinate values in the horizontal coordinate system when the laser point finder is located on the graphic contour of the tire cross section;

[0022] S3. If the number of the recorded coordinate values reaches a preset threshold, a corresponding graphic outline is drawn according to the obtained coordinate values and saved as a drawing file.

[0023] As can be seen from the foregoing description, the present invention provides a tire cross-section drawing method and device. Using a laser point finder, the coordinate values corresponding to the horizontal coordinate system of the corresponding graphic outline on the tire cross-section are obtained. This method is highly accurate and efficient, changing traditional manual measurement methods and meeting the cross-section measurement needs of technological research and development. Furthermore, the corresponding graphic outline is drawn based on the obtained coordinate values and saved as a drawing file. This process is efficient, the drawn file has minimal errors, and is highly accurate.

[0024] Furthermore, after step S3, the following steps are further included:

[0025] The similarity between the drawn graphic outline and the preset standard graphic outline is calculated to obtain a corresponding similarity value. If the similarity value is greater than a preset similarity threshold, the tire corresponding to the tire section is determined to be qualified.

[0026] From the above description, it can be seen that the similarity between the drawn graphic outline and the preset standard graphic outline is calculated, so that the tire corresponding to the tire section is judged to be qualified through the similarity. It is also possible to compare the drawn graphic outline with the preset standard graphic outline to find out the error, and make corresponding adjustments to the tire structure design based on the error to ensure the accuracy of tire production and design.

[0027] Furthermore, step S1 further includes:

[0028] Clean the tire section surface.

[0029] From the above description, it can be seen that the surface of the tire section should be cleaned to prevent particles and other substances from adhering to the surface of the tire section, which will affect the judgment accuracy of the laser point finder and thus affect the accuracy of the coordinate values obtained from the graphic contour of the tire section.

[0030] Furthermore, step S1 further includes:

[0031] A mark is drawn along the outline of the graphic on the cleaned tire section surface.

[0032] From the above description, it can be seen that markings are drawn along the graphic outline on the cleaned tire cross-section surface, which facilitates identification of the graphic outline on the tire cross-section surface and facilitates operation, while also improving the judgment and recognition accuracy of the laser point finder.

[0033] Furthermore, the tire section is fixed horizontally on a preset measuring platform in step S1, specifically:

[0034] On the measuring platform, switchable magnetic seats are provided at the bead position, the palm position and the crown position corresponding to the tire section, so that the tire section can be fixed horizontally on the preset measuring platform.

[0035] As can be seen from the above description, the switchable magnetic mount secures the tire cross section horizontally on the pre-set measuring platform, ensuring tire cross-section positioning and preventing deviation during measurement. Furthermore, the switchable magnetic mount can be moved and repositioned to suit the tire specifications, making positioning easier when changing tire sizes.

[0036] The present invention provides a tire cross-section drawing device, including a processor, a laser point finder and a measuring platform. A horizontal coordinate system is built on the measuring platform. The measuring platform is provided with a first adjustment mechanism that can move along a horizontal direction corresponding to the position of the horizontal coordinate system. The first adjustment mechanism is provided with a second adjustment mechanism that can move along another horizontal direction. The one horizontal direction is perpendicular to the other horizontal direction. The laser point finder is arranged on the second adjustment mechanism and the laser point finder is arranged vertically downward. The position of the laser point finder on the horizontal plane is associated with the position on the horizontal coordinate system. The laser point finder establishes a communication connection with the processor.

[0037] As can be seen from the foregoing description, the present invention provides a tire cross-section mapping device that provides a fixed platform and coordinate reference for the tire end face, and is equipped with a first adjustment mechanism and a second adjustment mechanism. The laser point finder is able to move in two mutually perpendicular axial directions corresponding to the horizontal direction on the measurement platform via the first and second adjustment mechanisms, thereby obtaining coordinate values corresponding to the tire end face in a horizontal coordinate system. The mapping device is simple and quick to operate.

[0038] Furthermore, a first laser light and a second laser light are provided on the measuring platform. The first laser light is arranged along one horizontal direction, and the second laser light is arranged along another horizontal direction.

[0039] From the above description, it can be seen that the arrangement of the first laser light and the second laser light can play a role in calibration and positioning corresponding to the placement position of the tire end face.

[0040] Furthermore, the measuring platform is provided with switchable magnetic seats at the bead position, the tread palm position and the tread crown position corresponding to the tire section.

[0041] As can be seen from the above description, the switchable magnetic mount secures the tire cross section horizontally on the pre-set measuring platform, ensuring tire cross-section positioning and preventing deviation during measurement. Furthermore, the switchable magnetic mount can be moved and repositioned to suit the tire specifications, making positioning easier when changing tire sizes.

[0042] Furthermore, the number of the first adjustment mechanisms is two, and the number of the second adjustment mechanisms is one; the first adjustment mechanism and the second adjustment mechanism are respectively provided with a guide rail ball screw and a motor, and the motor is driven and connected to the guide rail ball screw; the two first adjustment mechanisms are respectively arranged on the two opposite sides corresponding to the measuring platform, and the second adjustment mechanism is arranged on the two first adjustment mechanisms, and the two ends of the second adjustment mechanism are respectively slidably connected to the guide rail ball screws corresponding to the two first adjustment mechanisms; the laser point finder is slidably connected to the guide rail ball screw corresponding to the second adjustment mechanism.

[0043] From the above description, it can be seen that the motor drives the guide rail ball screw to move, thereby driving the laser point finder to move on the measuring platform. The operation is fast and accurate, and the error caused by manual operation can be reduced.

[0044] Furthermore, the vertical projection of the projection light of the first laser lamp and the vertical projection of the projection light of the second laser are perpendicular and intersecting on the measuring platform, and the intersection is located at the origin of the corresponding horizontal coordinate system on the measuring platform; the tire toes at both ends of the tire section placed correspondingly on the measuring platform are respectively located at the positions of the vertical projection of the projection light of the second laser, and the midpoint between the two tire toes and the crown center of the tire section are both located at the positions of the vertical projection of the projection light of the first laser lamp.

[0045] From the above description, it can be seen that the positioning of the tire section is achieved by arranging the first laser and the second laser on the measuring platform.

[0046] Please refer to Figure 1 , embodiment 1 of the present invention is:

[0047] A method for drawing a tire cross section is provided, comprising the following steps:

[0048] S1. Prepare a tire section and fix the tire section horizontally on a preset measuring platform with the outline of the tire section facing vertically upward; a horizontal coordinate system is established on the measuring platform;

[0049] S2. Adjusting the horizontal position of a laser point finder mounted on the measuring platform along the graphic contour of the tire cross section, and obtaining and recording corresponding coordinate values in the horizontal coordinate system when the laser point finder is located on the graphic contour of the tire cross section;

[0050] S3. If the number of the recorded coordinate values reaches a preset threshold, a corresponding graphic outline is drawn according to the obtained coordinate values and saved as a drawing file.

[0051] Specifically, preparing a tire section in step S1 refers to cutting the finished tire out of the factory with a cutting machine to obtain a tire section. The tire in this solution specifically refers to a giant engineering machinery radial tire, including a full series of tire models R49, R51, R57, and R63. The tire can be a self-developed tire of the same model or a purchased tire.

[0052] The measuring platform is equipped with a horizontal coordinate system, a laser point finder mounted above the measuring platform, a first adjustment mechanism movable along one horizontal direction of the measuring platform, and a second adjustment mechanism mounted on the first adjustment mechanism movable along the other horizontal direction of the measuring platform. The laser point finder is driven by the second adjustment mechanism to move to a position on the measuring platform corresponding to the horizontal coordinate. The position of the laser point finder on the horizontal plane is correlated with the corresponding position on the horizontal coordinate system of the measuring platform.

[0053] The graphic contour of the tire section specifically refers to the material dividing line on the tire section, specifically including the crown curve, the carcass curve and the sidewall radian curve, etc. The coordinate values of the multiple material dividing lines on the tire section on the horizontal coordinate system are identified and recorded in sequence by a laser point finder. Specifically, the laser point finder is driven to move from one end of the graphic contour to the other end, and the cursor on the laser point finder is projected onto the graphic contour. The coordinate value of the point can be identified, and the coordinate value is displayed to the PLC processor of the peripheral device. The coordinate value is recorded by performing a confirmation operation in the PLC processor. The preset threshold value of the number of coordinate values is between 1000-1500 points. When the corresponding coordinate value of any graphic contour is recorded between 1000-1500 points, the PLC processor of the peripheral device will identify and prompt, and the corresponding graphic contour can be drawn with the obtained coordinate value and saved as a drawing file. The drawing file mainly refers to a graphic file. Preferably, this solution mainly refers to a CAD drawing file.

[0054] In this embodiment, after step S3, the following steps are further included:

[0055] The similarity between the drawn graphic profile and a preset standard graphic profile is calculated to obtain a corresponding similarity value. If the similarity value exceeds a preset similarity threshold, the tire corresponding to the tire section is deemed qualified. If the tire section is taken from a self-developed tire, the preset standard graphic profile refers to the original design drawing of the self-developed tire. If the tire section is taken from a purchased tire, the preset standard graphic profile refers to the design drawing of a self-developed tire of the same model. By comparing the drawn graphic profile with the preset standard graphic profile, corresponding design and process errors can be identified, and corresponding adjustments can be made to the tire structural design to address these errors, ensuring tire production and design accuracy.

[0056] In this embodiment, step S1 further includes:

[0057] Clean the tire section surface.

[0058] After the tire section cutting is completed, the tire section surface should be cleaned to prevent particles and other substances from adhering to the tire section surface. Since the laser point finder is interfered by objects, it is easy to affect the judgment accuracy of the laser point finder, thereby affecting the accuracy of the coordinate value obtained from the graphic contour of the tire section.

[0059] In this embodiment, a mark is drawn along the outline of the graphic on the cleaned tire cross-section surface.

[0060] The cleaned tire cross-section surface is marked along the graphic outline with a marking pen to facilitate the identification of the graphic outline on the tire cross-section surface when operating the laser point finder, which facilitates operation and can improve the judgment and recognition accuracy of the laser point finder.

[0061] In this embodiment, the tire section is fixed horizontally on a preset measuring platform in step S1, specifically:

[0062] On the measuring platform, switchable magnetic seats are provided at the bead position, the palm position and the crown position corresponding to the tire section, so that the tire section can be fixed horizontally on the preset measuring platform.

[0063] After cleaning the tire section, it is secured to the measuring platform. A switchable magnetic mount secures the tire's bead, bead, and crown positions horizontally on the pre-set measuring platform. This horizontal fixation of the tire section on the pre-set measuring platform ensures proper positioning, primarily preventing deviation during measurement. Furthermore, the switchable magnetic mount can be moved and repositioned to accommodate different tire specifications, making positioning easier when changing tire sizes.

[0064] Please refer to Figure 2 , the second embodiment of the present invention is:

[0065] A tire cross-section drawing device is provided, comprising a processor, a laser point finder 1 and a measuring platform 2.

[0066] The tire section is fixed to the measuring platform, which consists of four supporting legs and a rectangular iron plate. The rectangular iron plate is located on the upper end of the measuring platform and is 20 mm thick. The corresponding upper surface of the iron plate is also covered with a 5 mm thick stainless steel plate to prevent rust and deformation. A horizontal coordinate system is built on the measuring platform and recorded in the processor.

[0067] The measuring platform is provided with two first adjustment mechanisms 21 movable along one horizontal direction and a second adjustment mechanism 22 movable along another horizontal direction at positions corresponding to the horizontal coordinate system. The second adjustment mechanism is arranged on the first adjustment mechanism and perpendicular to the first adjustment mechanism, and the one horizontal direction is perpendicular to the other horizontal direction. Specifically, the one horizontal direction corresponds to the X-axis of the horizontal coordinate system on the measuring platform, and the other horizontal direction corresponds to the Y-axis of the horizontal coordinate system on the measuring platform. Specifically, the first adjustment mechanism and the second adjustment mechanism are respectively provided with a guide rail ball screw and a motor. The motor is driven by the guide rail ball screw, and the guide rail ball screw is provided with a slider connected to the screw drive. The guide rail ball screws of the two first adjustment mechanisms are respectively arranged on opposite sides of the measuring platform and are parallel to the X-axis of the horizontal coordinate system on the measuring platform. The two ends of the guide rail ball screw of the second adjustment mechanism are respectively connected to the sliders on the two guide rail ball screws of the first adjustment mechanism, so that the two ends of the second adjustment mechanism are respectively slidably connected to the guide rail ball screws corresponding to the two first adjustment mechanisms. The second adjustment mechanism is parallel to the Y-axis of the horizontal coordinate system on the measuring platform. The laser point finder is connected to a slider on the guide rail ball screw of the second adjustment mechanism, thereby achieving a sliding connection between the laser point finder and the corresponding guide rail ball screw of the second adjustment mechanism. By driving the motors of the first adjustment mechanism and the second adjustment mechanism respectively, the laser point finder can be driven to move along the X-axis and Y-axis directions of the horizontal coordinate system of the measuring platform.

[0068] In this embodiment, the measuring platform is provided with a first laser lamp and a second laser lamp, with the first laser lamp arranged along one horizontal direction and the second laser lamp arranged along another horizontal direction. Furthermore, the vertical projection of the projection light of the first laser lamp and the vertical projection of the projection light of the second laser lamp are perpendicular and intersecting on the measuring platform, and the intersection is located at the origin of the corresponding horizontal coordinate system on the measuring platform. Specifically, the tire toes at both ends of the corresponding tire section placed on the measuring platform are respectively located at the positions of the vertical projection of the projection light of the second laser, and the midpoint between the two tire toes and the crown center of the tire section are both located at the position of the vertical projection of the projection light of the first laser lamp. The laser lamp can be used to locate the tire section, which facilitates the subsequent drawing of the corresponding graphic outline as a drawing file, ensuring the standardization of the CAD drawing file.

[0069] In this embodiment, the measuring platform is also equipped with multiple switchable magnetic mounts, which are connected to the rectangular iron plate on the measuring platform via magnetic attraction. The switchable magnetic mounts are used to secure the tire's bead, palm, and crown positions corresponding to the tire's cross section on the measuring platform, thereby securing the tire's cross section horizontally on the pre-set measuring platform. The switchable magnetic mounts secure the tire's cross section horizontally on the pre-set measuring platform, thereby positioning the tire's cross section and preventing deviation during the tire cross-section measurement process. Furthermore, the switchable magnetic mounts can be moved and repositioned according to tire specifications, facilitating positioning when changing tire specifications.

[0070] In this embodiment, the processor is a PLC processor, which is respectively connected to the laser point finder, the drive handle and the PC, and the drive handle is connected to the laser point finder. Specifically, the laser point finder establishes a communication connection with the processor so that the coordinate values obtained by the laser point finder can be displayed and identified in the processor. The drive handle establishes a connection with the corresponding motor on the first adjustment mechanism and the corresponding motor on the second adjustment mechanism so that the drive handle can achieve a transmission connection with the laser point finder, and the guide rail ball screw is driven by the drive handle, thereby driving the coordinate point finder to move.

[0071] In this embodiment, the laser point finder can identify the outline of the graphic through human visual judgment and laser automatic recognition.

[0072] In this embodiment, the PC is connected to the processor, and the processor records and saves the corresponding coordinate values in the horizontal coordinate system when all laser point finders are located on the graphic contour of the tire section. When the number of recorded coordinate values reaches the range of 1000-1500 points, the processor packages all coordinate values and sends them to the PC. The PC is pre-installed with graphic recognition software, which can connect all coordinate values to form a line contour and can export the line contour to a CAD version.

[0073] In summary, the tire cross-section drawing method and device provided by the present invention utilizes a laser point detector to obtain the coordinate values corresponding to the horizontal coordinate system of the corresponding graphic outline on the tire cross-section. This method offers high precision and efficiency, replacing traditional manual measurement methods and meeting the cross-section measurement needs of technological research and development. Furthermore, the corresponding graphic outline is drawn based on the obtained coordinate values and saved as a drawing file. This process is efficient, with minimal errors and high precision.

[0074] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for drawing a tire cross section, characterized in that: The following steps are involved: S1. Prepare a tire section and fix the tire section horizontally on a preset measuring platform with the outline of the tire section facing vertically upward; a horizontal coordinate system is established on the measuring platform; S2. Adjusting the horizontal position of a laser point finder mounted on the measuring platform along the graphic contour of the tire cross section, and obtaining and recording corresponding coordinate values in the horizontal coordinate system when the laser point finder is located on the graphic contour of the tire cross section; Step S2 includes: sequentially identifying and recording the coordinate values of the horizontal coordinate system where the plurality of material dividing lines on the tire cross section are located by a laser point finder; S3. If the number of the recorded coordinate values reaches a preset threshold, a corresponding graphic outline is drawn according to the obtained coordinate values and saved as a drawing file; Step S3 includes: when the coordinate values corresponding to any graphic outline are recorded to a preset number, drawing the corresponding graphic outline according to the obtained coordinate values; The graphic outline of the tire section specifically refers to the material dividing line on the tire section, including the crown curve, the carcass curve and the sidewall camber curve.

2. A tire cross-section drawing method according to claim 1, characterized in that: After step S3, the following steps are also included: The similarity between the drawn graphic outline and the preset standard graphic outline is calculated to obtain a corresponding similarity value. If the similarity value is greater than a preset similarity threshold, the tire corresponding to the tire section is determined to be qualified.

3. A tire cross-section drawing method according to claim 1, characterized in that: Step S1 further includes: Clean the tire section surface.

4. A tire cross-section drawing method according to claim 3, characterized in that: Step S1 further includes: A mark is drawn along the outline of the graphic on the cleaned tire section surface.

5. The tire cross-section drawing method according to claim 1, characterized in that: The step S1 of fixing the tire section horizontally on a preset measuring platform is specifically as follows: On the measuring platform, switchable magnetic seats are provided at the bead position, the palm position and the crown position corresponding to the tire section, so that the tire section can be fixed horizontally on the preset measuring platform.

6. A tire cross-section drawing device, characterized in that: A method for drawing a tire cross section according to any one of claims 1 to 5 above; It includes a processor, a laser point finder and a measuring platform. A horizontal coordinate system is built on the measuring platform. The measuring platform is provided with a first adjustment mechanism that can move along a horizontal direction corresponding to the position of the horizontal coordinate system. The first adjustment mechanism is provided with a second adjustment mechanism that can move along another horizontal direction. The one horizontal direction is perpendicular to the other horizontal direction. The laser point finder is arranged on the second adjustment mechanism and the laser point finder is arranged vertically downward. The position of the laser point finder on the horizontal plane is associated with the position on the horizontal coordinate system. The laser point finder is driven by the first adjustment mechanism and the second adjustment mechanism and moves along the X-axis and Y-axis directions of the horizontal coordinate system corresponding to the measuring platform. The laser point finder establishes a communication connection with the processor.

7. A tire cross-section drawing device according to claim 6, characterized in that: The measuring platform is provided with a first laser lamp and a second laser lamp, wherein the first laser lamp is arranged along one horizontal direction, and the second laser lamp is arranged along another horizontal direction.

8. The tire cross-section drawing device according to claim 6, characterized in that: The measuring platform is provided with switch-type magnetic seats at the bead position, the palm position and the crown position of the tire section corresponding to the tire section.

9. The tire cross-section drawing device according to claim 6, characterized in that: The number of the first adjustment mechanisms is two, and the number of the second adjustment mechanism is one; The first adjustment mechanism and the second adjustment mechanism are respectively provided with a guide rail ball screw and a motor, and the motor is drivingly connected to the guide rail ball screw; The two first adjustment mechanisms are respectively arranged on two opposite sides of the measuring platform, the second adjustment mechanism is arranged on the two first adjustment mechanisms, and the two ends of the second adjustment mechanism are respectively slidably connected to the guide rail ball screws corresponding to the two first adjustment mechanisms; The laser point finder is slidably connected to the guide rail ball screw corresponding to the second adjustment mechanism.

10. The tire cross-section drawing device according to claim 7, characterized in that: The vertical projection of the projection light of the first laser lamp and the vertical projection of the projection light of the second laser lamp are perpendicular and intersect on the measuring platform, and the intersection point is located at the origin position of the corresponding horizontal coordinate system on the measuring platform; The toes at both ends of the tire section placed on the measuring platform are respectively located at the positions of the vertical projections of the projection light of the second laser, and the midpoint between the two toes and the crown center of the tire section are both located at the positions of the vertical projections of the projection light of the first laser light.

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