KR20100097253A - Inspection device of rare tire condition and methods thereof - Google Patents

Abstract

PURPOSE: An apparatus and a method for inspecting a half-finished tire are provided to obtain the information on the presence and the absence of the centering, the snaking, the overlap and the open gap and the degree of the open gap of a half-finished tire at a time. CONSTITUTION: A laser is radiated in a width direction of a half-finished tire. An image on the laser radiated region of the half-finished tire is obtained at a different angle from the radiating angle of the laser(20) through a image taking device(10). The distribution sections of a primary rubber band and a secondary rubber band of the surface of the tire, the discontinuous section length of the laser radiated onto the surface of the secondary rubber band and the deformed amount of the laser are read from the obtained image. The width and the height of the joint of the secondary rubber band corresponding to the discontinuous section are calculated from the discontinuous section length of the laser and the deformed amount of the laser. The quality of the half-finished tire is determined by comparing the width and the height of the calculated joint and the distribution sections of the primary rubber band and the secondary rubber band. The determination result is displayed.

Description

Tire semi-finished product inspection device and its method {INSPECTION DEVICE OF RARE TIRE CONDITION AND METHODS THEREOF}

The present invention relates to a tire semi-finished product inspection device and a method thereof, and more particularly, irradiates a laser line to a surface of a semi-finished product of a tire, and photographs an area where the laser line is irradiated to photograph a primary rubber band and a secondary rubber of the surface of a semi-finished product. The present invention relates to an inspection apparatus and a method for inspecting the quality of semi-finished products by detecting the presence of band centering and snaking, and the presence or the extent of overlap or open gap of the end joint of the second rubber band.

Tire semifinished product is the first simple rubber composite made for tire molding, and refers to a product in which a primary rubber band and a secondary rubber band are laminated and bonded to a circular drum as shown in FIG. 1.

The semi-finished product is inspected by a quality check, the semi-finished product is discarded, and the semi-finished product is made into a finished product tire through a molding process after the drum is removed.

Tires play a very important role in driving a car safely, and the left and right balance must be precisely balanced. Therefore, it is basic that the first rubber band and the second rubber band of semi-finished products should have accurate dimension and uniform thickness, and the second rubber band should be bonded in place on the surface of the first rubber band, and both ends contact each other. The joints of the rubber bands must be precisely abutted.

That is, as shown in Figure 1, the center line of the first rubber band and the second rubber band of the tire semi-finished product is aligned so that the second rubber band should be disposed in the center of the primary rubber band without biasing to one side (that is, Centering must be correct)

The width of the primary and secondary rubber bands must be constant from beginning to end (i.e. no snaking)

In the joint part of the secondary rubber band where both ends contact each other, there should be no overlap over one end or an open gap where one end and the other end do not touch.

Tires made from semi-finished products with misaligned centering, sneakers, overlaps or open gaps are sensitive to safe driving, so inspect the quality of the semi-finished products before molding and discard the waste and use only good quality semi-finished products. shall.

Conventionally, there is no automated device or method for inspecting the quality of a semi-finished product of the tire, and it was a general inspection method that the inspector inspected the naked eye or measured by ruler.

Therefore, it took considerable time and manpower to inspect semi-finished products, and since the inspector is not a machine, many misjudgement of the acceptance judgment occurred.

Therefore, there is a continuing need for an apparatus and method capable of inspecting the quality of semi-finished tire products quickly and accurately and automatically.

An object of the present invention is to provide a highly reliable inspection apparatus and inspection method capable of quickly and accurately inspecting whether a tire semi-finished product is suitable or inadequate while having a simple structure.

Furthermore, an object of the present invention is to provide a tire semi-finished product inspection apparatus and method which can improve the efficiency of quality control by informing the task manager accurately of defective factors and defective locations throughout the entire tire semi-finished product.

In order to achieve the above object, the tire semi-finished product inspection method according to the present invention,

A line laser irradiation step of irradiating a line in a width direction of a semi-finished product;

Disposed on a longitudinal (i.e., circumferential) extension line of the semifinished product of the tire, and different from the irradiation angle of the line laser (meaning the angle of the circumferential extension line passing through the irradiation surface of the line laser and the laser line on the surface of the tire semifinished product); Obtain an image by photographing the line laser irradiation area of the surface of the semi-finished product of the tire at the photographing angle (meaning the angle of the circumferential extension line passing through the laser line of the semi-finished product surface and the laser line of the semi-finished product surface) Making a step;

From the obtained image, the distribution sections (S1, S2) of the primary rubber band and the secondary rubber band on the surface of the semifinished tire product, the discontinuous section length (W) of the laser line irradiated on the surface of the secondary rubber band and the laser line An image analysis step of reading the deformation amount H;

Computing step of calculating the width (w) and the height (h) of the secondary rubber band joint part corresponding to the discontinuous section from the discontinuous section length (W) of the laser line and the deformation amount (H) of the laser line obtained in the image analysis step Wow;

Semi finished products by comparing the distribution sections (S1, S2) of the primary rubber band and the secondary rubber band read in the image analysis step and the width (w) and height (h) of the joint part calculated in the calculation step, respectively, with reference values. A comparative determination step of determining whether or not the;

And displaying the result of the comparison determination step.

And in the comparative determination step,

From the distribution section (S1, S2) of the primary rubber band and the secondary rubber band, the centering of the semi-finished product and the snaking are checked.

From the width (w) and the height (h) of the secondary rubber band joint part, there is an overlap or open gap, and the number depends on the degree of the overlap or open gap. Characterized in that for checking,

The line laser irradiation surface and the photographing line of the photographing apparatus form an acute angle β;

In the operation step,

The width (w) of the joint part is calculated by the same value as the length (W) of the discontinuous section of the laser line,

The height h of the joint part is larger than the irradiation angle α of the laser irradiation device on the basis of the circumferential extension line of the semi-finished product. It is calculated, and when the irradiation angle (α) of the laser irradiation apparatus is larger than the shooting angle of the imaging device, characterized in that it is calculated by the following equation (4),

Inspection device for the tire semi-finished product inspection method of the present invention

A rotator for rotating a tire semifinished product;

A laser irradiation device for irradiating a line laser in the width direction of the semi-finished product of the tire;

Disposed on a longitudinal (i.e., circumferential) extension line of the semifinished product of the tire, and different from the irradiation angle of the line laser (meaning the angle of the circumferential extension line passing through the irradiation surface of the line laser and the laser line on the surface of the tire semifinished product); The line laser irradiation area of the surface of the semi-finished product is photographed at a photographing angle (meaning the angle of the circumferential extension line passing through the laser line of the semi-finished product surface and the laser line of the semi-finished product surface), and the photographed image is taken. A photographing apparatus for processing;

A control unit including a vision control unit for analyzing and processing the image signal obtained by the photographing apparatus, and a comparison determination unit for analyzing the video signal supplied from the vision control unit to determine whether the tire is a semi-finished product and generating a display control signal. ;

And a display unit configured to receive a display control signal input from the controller to display a state of whether the tire is a semi-finished product.

And the laser irradiation device is fixed and arranged to irradiate the line laser in the width direction of the tire semi-finished product so that the circumferential extension line and the irradiation surface of the semi-finished tire product to a certain angle,

The photographing apparatus is fixed and arranged to photograph the laser line region of the surface of the semi-finished product of the tire so that the circumferential extension line passing through the laser line of the semi-finished product of the tire and the photographing line coincide.

An angle formed by the intersection of the irradiation surface of the laser irradiation device and the imaging line of the imaging device forms an acute angle β,

The laser irradiation device is fixed and arranged so that the line laser is irradiated in the width direction of the surface of the semi-finished product of the tire so that the circumferential extension line of the semi-finished product and the irradiated surface coincide.

The photographing apparatus is fixed and arranged to photograph the area of the laser line on the surface of the semi-finished product such that the circumferential extension line passing through the laser line on the surface of the semi-finished product of the tire and the photographing line form an angle.

An angle formed by the intersection of the irradiation surface of the laser irradiation device and the photographing line of the imaging device forms an acute angle β.

This configuration not only ensures the presence and extent of centering, sneakers, overlaps and open gaps of semi-finished tire products at a time, but also provides a quick and accurate inspection of the suitability and non-fit of semi-finished products, even with a simple structure. The inspection reliability can be improved.

In addition, the present invention not only accurately informs the task manager of the location and factors of the failure occurrence in real time, but also the administrator can replay the image to confirm the defect, thereby reducing the incidence of defective tire semi-finished products.

Hereinafter, the present invention will be specifically described based on the preferred embodiment of the present invention shown in the drawings.

First, Figure 2 is a conceptual diagram for explaining the inspection principle of the present invention. When the line laser is irradiated obliquely on the surface of the inspection object 100 with the laser irradiation device 20, when the surface of the inspection object 100 is flat, the line of the laser is kept straight, but the surface of the inspection object 100 If there is a bend (concave or convex), as shown in Fig. 3, the line of the laser does not become a straight line and a discontinuous portion appears, and the discontinuous line is formed far from the reference line depending on the depth of the recess or the height of the protrusion. . The shape of the recess or protrusion formed on the surface of the inspection object may be determined by acquiring and analyzing the state of the laser line as an image through the photographing apparatus 10 provided on the inspection object.

The present invention has devised a method and apparatus for inspecting and determining the quality of semi-finished tire products using this principle.

Figure 3 is a schematic configuration diagram of the tire semi-finished product inspection device according to the present invention, the photographing apparatus 10 for photographing the surface of the tire semi-finished product (T) rotated by a rotating device (not shown), and the tire semi-finished product (T) The line laser irradiation apparatus 20 for irradiating a laser line in the width direction of the is provided.

At this time, the photographing apparatus 10 and the laser irradiation apparatus 20 should be arranged so that a shadow area does not occur by interfering with each other or obstructing irradiation,

When the imaging line 8 of the imaging apparatus and the irradiation surface 9 of the laser irradiation apparatus are coincident with each other, there is no discontinuity of the laser line. Therefore, the object according to the present invention may be achieved by not matching the imaging line and the irradiation surface. . The angle between the photographing line and the irradiation surface of the two devices is the most in the range of about 30 ~ 60 ~.

And since the laser irradiation device 20 irradiates the laser in the form of a line, even if the laser irradiation while changing the position in any one width direction of the tire semi-finished product, the laser line on the surface of the tire is formed in the same position and the joint portion 3 The position (angle) of the laser irradiation surface 9 for calculating the width w and the height h is formed the same. However, there may be a portion where the line is not formed because the laser is blocked by the bending (ie, the joint part) of the surface of the semi-finished product (T).

However, since the photographing apparatus 10 photographs a certain area of the surface of the semi-finished tire product, there is an area not photographed by the bending (that is, the joint part) of the surface of the semi-finished product T according to the change in position thereof, as well as the joint part 3. The photographing line for calculating the width (w) and height (h) is changed.

Therefore, the calculation of the width (w) and height (h) of the joint part 3 is simplified, and the photographing apparatus 10 and the laser are prevented so that the shadow area where the laser is not irradiated or photographed by the bending of the joint part 3 does not occur. The irradiation device 20 is preferably arranged on the circumferential extension line of the tire semi-finished product T.

Particularly, in the case of the photographing apparatus 10, the tire semi-finished product is used to determine whether the length of the primary rubber band 1 exposed to both sides of the secondary rubber band 2 is the same, that is, whether the centering is correct. It is more necessary to be disposed on the circumferential extension line of (T).

As shown in FIG. 3, the photographing apparatus 10 and the laser irradiation apparatus 20 are mounted on a stage S spaced apart from the tire semi-finished product T by a predetermined distance.

The stage (S) is composed of a vertical rail (6) and a horizontal rail (7), the horizontal rail (7) is arranged along the direction of rotation of the semi-finished product and can be moved up and down along the vertical rail (6) Mounted to control the range of the imaging area and the irradiation area of the imaging device and the irradiation device, the imaging device 10 and the laser irradiation device 20 is spaced a certain distance so as not to interfere with each other shooting and irradiation horizontal rail ( 7) and is movable along the horizontal rail.

The laser irradiator 20 mounted on the horizontal rail 7 of the stage irradiates the line laser in a direction perpendicular to the direction of rotation of the rotating tire semi-finished product T, and the imaging apparatus 10 is irradiated with the line laser. The semi-finished (T) surface of the area is photographed.

The captured image is analyzed by the controller 30 to determine the distribution sections S1 and S2 of the primary rubber band 1 and the secondary rubber band 2 and the joint portion 3 of the secondary rubber band 2. The width (w) and height (h) is calculated and the result is displayed on the screen.

4 is a diagram illustrating the mutual coupling relationship between the components connected to the control unit according to the present invention, wherein the control unit 30 includes a vision control unit 301 and a comparison determination unit 302. The vision control unit 301 analyzes and processes the image signal acquired by the photographing apparatus, and the comparison determination unit 302 performs an overall control operation related to the inspection of the tire semi-finished product and the image signal supplied from the vision control unit. Analyze the result of the tire semi-finished product and generate the display control signal.

FIG. 5 schematically shows an example of a tire semifinished product T having an overlap, an irradiation device 20 for irradiating a line laser to the semifinished product surface, and an imaging device 10 for imaging a laser irradiation area.

The distribution section (S1, S2) of the primary rubber band and the secondary rubber band, the discontinuous section length (W) of the laser line and the deformation amount (H) of the laser line are read from the image photographed by the photographing apparatus (10). To me.

The distribution section (S1, S2) of the primary rubber band and the secondary rubber band and the discontinuous section length (W) of the laser line can be calculated using the laser line, but the boundary line caused by the contrast difference of the image itself even without the laser line can be calculated. The length can also be calculated from.

The controller 30 acquires the distribution sections S1 and S2 of the primary rubber band and the secondary rubber band in the image itself or by using the discontinuity of the laser line, and the obtained distribution sections S1 and S2 are the tire semi-finished products ( T) It is judged whether it is kept constant in all sections, and it is determined whether it is good or bad.

That is, the comparison determination unit 302 of the control unit 30 has a length in which the distribution section S2 of the secondary rubber band is symmetrically from the center line to both sides within a preset reference value (a proper allowable value) and a comparison tolerance range. Is determined to be constant and the lengths of the primary rubber band distribution sections S1 on both sides are the same, and are constantly maintained in the entire section, thereby determining the centering and sneaking of the tire semi-finished product.

The laser line appears in a straight line in the photographed image when the surface of the object to be irradiated is flat, but the laser line projected on the joint portion 3 of the secondary rubber band 2 is shifted from the laser irradiation direction (ie, the irradiation surface). When viewed from an angle, the joints appear in the captured image as outlines.

Here, the straight line of the laser reflected on the surface of the secondary rubber band (2) will be defined as a 'reference line', and in the part where the contour of the joint part 3 is formed, this reference line appears to be broken, so this section is called 'discontinuous section'. Will be defined. In addition, the space | interval between the contour line of the joint part 3, and the said reference line is called "the deformation amount H of a laser line."

For reference, the laser line (reference line) illuminated on the surface of the secondary rubber band 2 is broken without forming a straight line with the primary rubber band 1, the laser line illuminated on the surface, and the laser line illuminated on the drum 4 surface. As defined above, this may also be referred to as a “discontinuity section,” but the primary rubber band 1 and the drum's discontinuity section 4 (ie, the distribution section S1 of the primary rubber band) have their lengths and positions. Is not a problem and its height is not a problem, and the length and position of the section can be extracted from the image itself without a laser line, so it is excluded from the definition of 'discontinuous section' above.

In particular, in the present invention, when the photographing apparatus 10 and the laser irradiation apparatus 20 are installed, the photographing line 8 of the photographing apparatus and the irradiation surface 9 of the laser irradiation apparatus 20 are shifted. It should be installed so that discrete sections of the laser line are formed. As described above, the two devices are installed on the circumferential extension line of the semi-finished tire T, and the irradiation surface 9 and the photographing line 8 form an acute angle β with each other.

In the simplest configuration, as shown in FIG. 3, the photographing apparatus 10 is set to be photographed on the circumferential extension line of the semi-finished product T so that the photographing line 8 and the circumferential extension line coincide with each other. The laser irradiation apparatus for irradiating the line laser with the photographing line 8 and the irradiation surface 9 of the imaging device 10 at a predetermined acute angle (ie, the irradiation surface at a predetermined angle with the circumferential extension line) ( 20) is fixed and arranged.

In this case, the method of calculating the height h of the joint part 3 by analyzing the image photographed by the photographing apparatus 10 is as follows.

For reference, the joint part 3 is formed in an oblique line at an angle of about 71 to 75 degrees with respect to the rotation direction of the semi-finished product (T), and may vary slightly depending on the inclination angle of the inclined part of the joint part. However, the error is negligible.

h = H / tan (β)

Here, h is the height of the joint part 3, where h is greater than 0 when overlapping occurs in the joint part and less than 0 when an open wrap is generated. Based on shooting.)

However, if the photographing apparatus is difficult to install such that the photographing apparatus 10 faces vertically downward due to a structural problem or the like, as shown in FIG. 5A, the photographing apparatus 10 is circumferentially extended. It is also possible to install at an angle so as to have a predetermined inclination angle (or 'shooting angle') (α) on the basis of the reference, the photographing apparatus 10 is set so as to photograph in an oblique direction toward the lower front, and the photographing apparatus 10 ) So that the line laser is irradiated in a direction more oblique than the photographing direction (ie, to have a larger irradiation angle than the photographing direction angle), so that the photographing line of the photographing apparatus 10 and the irradiation surface of the line laser It is a method of fixing and arranging the laser irradiation apparatus 20 so that the angle formed by crossing may make an acute angle (beta).

In this case, the method of calculating the height h of the joint part by analyzing the image photographed by the photographing apparatus 10 is as follows.

h = H * cos (α + β) / sin (β)

In Equation 2, if the photographing angle α of the photographing apparatus 20 is zero, this corresponds to a case where the photographing line 8 of the photographing apparatus is set to match the circumferential extension line. Considering that cos (α + β) = cos (α), it can be seen that Equation 2 includes Equation 1 above.

In another installation method, the laser irradiation apparatus 20 is set so that the line laser irradiates the surface of the semi-finished product 4 so that the irradiation surface 9 of the laser includes a circumferential extension line, There is a method of fixing and arranging the imaging device 10 such that the irradiation surface 9 and the imaging line 8 form a predetermined acute angle β.

In this case, the method of calculating the joint height h by analyzing the image photographed by the photographing apparatus 10 is as follows.

h = H / sin (β)

However, if the imaging device is a cause of structural problems, etc., it may be difficult for the laser irradiation device 20 to be installed such that the irradiation surface includes circumferential extension. At this time, as shown in Fig. 5B, the laser irradiation apparatus 20 is also installed obliquely to have a predetermined inclination angle (or 'irradiation angle') α with respect to the circumferential extension line. It is possible to set the laser irradiation apparatus 10 so that the irradiation angle is a certain angle, and to photograph the image so that the imaging line 8 is formed in a direction more oblique than the irradiation surface 9 of the laser irradiation apparatus 10. (I.e., to make the photographing angle larger than the irradiation angle), the photographing apparatus 10 is set so that the irradiation surface 9 of the line laser and the photographing line 8 of the photographing apparatus 10 It is a method of making the angle formed by crossing | intersection to form an acute angle ((beta)).

In this case, the method of calculating the height h of the joint part by analyzing the image photographed by the photographing apparatus 10 is as follows.

h = H / cos (α) sin (β)

In Equation 4, if the irradiation angle α of the laser irradiation apparatus 20 is zero, this means that the irradiation surface 9 includes a circumferential extension line. In the case of setting, considering that cos (α) = 1, it can be seen that Equation 4 includes Equation 3.

The height value h of the joint part and the width value w of the joint part calculated by the above process are compared with a reference value (suitable allowable value) preset by the comparison determination unit 302 of the control unit 30, According to the comparison result, it is determined whether the joint part is good, and the result value is transmitted to the display unit 40 and displayed as "fit" or "not suitable" on the screen.

The inspection apparatus according to the present invention records and stores in the database together with the coordinate values from the starting position point to the end position point until a series of processes for determining whether the tire semi-finished product is started and finished is performed. It can be built efficiently. In particular, it is possible to systematically manage the comprehensive information such as the joint height value (h) and the width value (w), the determination result ("conformity" or "incongruity") along with the image information for each coordinate. .

To summarize once again the inspection method according to the invention described above,

The laser line is irradiated in the width direction of the semi-finished product so that the irradiation surface 9 and the imaging line 8 are at a predetermined angle β on the circumferential extension line of the semi-finished product. ,

From the discontinuous section length (W) of the line obtained from the photographed image and the deformation amount (H) of the laser line, the determination of the suitability and nonconformity according to the open gap or overlap of the joint part and the degree thereof,

From the distribution section (S1, S2) of the primary rubber band and the secondary rubber band acquired from the photographed image, it is extracted whether the centering of the primary rubber band and the secondary rubber band is correct and there is no snaking, and fits it within the allowable range. Determine nonconformity.

The present invention can improve the reliability of inspection and improve the efficiency of quality control by automatically and accurately determining whether the semi-finished product has overlap, open gap, sneaker and centering before forming the semi-finished product to produce the finished tire. It is a very useful invention in the automobile industry.

1 is a cross-sectional view for explaining the cause of the failure of the tire semi-finished product.

2 is a conceptual diagram illustrating the principle of the present invention using a camera and a line laser.

Figure 3 is a schematic configuration of the tire semi-finished product inspection apparatus according to the present invention.

Figure 4 is a diagram showing the mutual coupling relationship between the control unit and each component of the present invention.

5A and 5B are conceptual views for explaining a method for inspecting the quality of semi-finished tire products.

Claims (6)

A line laser irradiation step of irradiating a line in a width direction of a semi-finished product; Disposed on a longitudinal (i.e., circumferential) extension line of the semifinished product of the tire, and different from the irradiation angle of the line laser (meaning the angle of the circumferential extension line passing through the irradiation surface of the line laser and the laser line on the surface of the tire semifinished product); Obtain an image by photographing the line laser irradiation area of the surface of the semi-finished product of the tire at the photographing angle (meaning the angle of the circumferential extension line passing through the laser line of the semi-finished product surface and the laser line of the semi-finished product surface) Making a step; From the obtained image, the distribution sections (S1, S2) of the primary rubber band and the secondary rubber band on the surface of the semifinished tire product, the discontinuous section length (W) of the laser line irradiated on the surface of the secondary rubber band and the laser line An image analysis step of reading the deformation amount H; Computing step of calculating the width (w) and the height (h) of the secondary rubber band joint part corresponding to the discontinuous section from the discontinuous section length (W) of the laser line and the deformation amount (H) of the laser line obtained in the image analysis step Wow; Semi finished products by comparing the distribution sections (S1, S2) of the primary rubber band and the secondary rubber band read in the image analysis step and the width (w) and height (h) of the joint part calculated in the calculation step, respectively, with reference values. A comparative determination step of determining whether or not the; And displaying the result of the comparison determination step. The method of claim 1, wherein in the comparison determination step, From the distribution section (S1, S2) of the primary rubber band and the secondary rubber band, the centering of the semi-finished product and the snaking are checked. From the width (w) and the height (h) of the secondary rubber band joint part, there is an overlap or open gap, and the number depends on the degree of the overlap or open gap. Checking whether the tire semi-finished product, characterized in that for checking. The method according to claim 1 or 2, The line laser irradiation surface and the photographing line of the photographing apparatus form an acute angle β; In the operation step, The width (w) of the joint part is calculated by the same value as the length (W) of the discontinuous section of the laser line, The height h of the joint part is larger than the irradiation angle α of the laser irradiation device on the basis of the circumferential extension line of the semi-finished product. And an irradiation angle (α) of the laser irradiation apparatus is larger than that of the photographing apparatus, and calculated by Equation 4 below. Equation 2 h = H * cos (α + β) / sin (β) Equation 4 h = H / cos (α) sin (β) Here, β is an angle formed by the intersection of the irradiation surface of the line laser and the photographing line of the photographing apparatus. A rotator for rotating a tire semifinished product; A laser irradiation device for irradiating a line laser in the width direction of the semi-finished product of the tire; Disposed on a longitudinal (i.e., circumferential) extension line of the semifinished product of the tire, and different from the irradiation angle of the line laser (meaning the angle of the circumferential extension line passing through the irradiation surface of the line laser and the laser line on the surface of the tire semifinished product); The line laser irradiation area of the surface of the semi-finished product is photographed at a photographing angle (meaning the angle of the circumferential extension line passing through the laser line of the semi-finished product surface and the laser line of the semi-finished product surface), and the photographed image is taken. A photographing apparatus for processing; And a vision control unit for analyzing and processing the video signal acquired by the photographing apparatus, and a comparative determination unit for analyzing the video signal supplied from the vision control unit to determine whether the tire is semi-finished and generating a display control signal. Control unit; And a display unit for receiving the display control signal input from the controller to display the state of the tire semi-finished product. The method of claim 4, wherein The laser irradiation device is fixed and arranged so that the line laser is irradiated in the width direction of the surface of the semi-finished product of the tire so that the circumferential extension line of the semi-finished product and the irradiated surface are at an angle. The photographing apparatus is fixed and arranged to photograph the laser line region of the surface of the semi-finished product of the tire so that the circumferential extension line passing through the laser line of the semi-finished product of the tire and the photographing line coincide. A semi-finished product inspection system for tire semi-finished products, characterized in that an angle formed by the intersection of the irradiation surface of the laser irradiation device and the photographing line of the imaging device forms an acute angle β. The method of claim 4, wherein The laser irradiation device is fixed and arranged so that the line laser is irradiated in the width direction of the surface of the semi-finished product of the tire so that the circumferential extension line of the semi-finished product and the irradiation surface coincide. The photographing apparatus is fixed and arranged to photograph the area of the laser line on the surface of the semi-finished product such that the circumferential extension line passing through the laser line on the surface of the semi-finished product of the tire and the photographing line form an angle. A semi-finished product inspection system for tire semi-finished products, characterized in that an angle formed by the intersection of the irradiation surface of the laser irradiation device and the photographing line of the imaging device forms an acute angle β.

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