CN109254021B - Tire level detection method and tire level detection device - Google Patents
Tire level detection method and tire level detection device Download PDFInfo
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- CN109254021B CN109254021B CN201811217656.3A CN201811217656A CN109254021B CN 109254021 B CN109254021 B CN 109254021B CN 201811217656 A CN201811217656 A CN 201811217656A CN 109254021 B CN109254021 B CN 109254021B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
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Abstract
The invention discloses a tire level detection method and a tire level detection device, wherein the method comprises the following steps: s1, horizontally placing the tire on a conveying plane A; s2, lifting the tyre from the conveying plane a to a detection plane; s3, acquiring the deformation of the tire in the lifting process; and S4, acquiring a lifting stroke required for lifting the axial center of the tire to a detection central plane according to the deformation of the tire in the lifting process, wherein the detection central plane is positioned above the detection plane. According to the tire level detection method, high efficiency and low cost can be guaranteed, tire imaging symmetry can be guaranteed, and the method is suitable for automatic judgment of tire defects.
Description
Technical Field
The invention relates to the technical field of tire detection, in particular to a tire level detection method and a tire level detection device.
Background
The related art tire X-ray detection apparatus is mainly in two modes of horizontal and vertical: the horizontal mode is that X-ray shooting is carried out after the tire is horizontally lifted; the vertical mode is to erect the tire and then lift it up for taking X-ray photographs. Thus, an image of the tire is obtained to determine the tire defect.
The horizontal mode has high detection efficiency, but the tire is easily deformed under the influence of gravity in the axial direction, so that the tire imaging is asymmetric about the radial center line of the tire, and effective automatic judgment cannot be carried out. In order to automatically determine the tire defect, regular and symmetrical tire imaging is required, so that the current tire X-ray detection equipment mainly adopts a vertical mode.
However, in the vertical mode, it is necessary to turn the tire, which is horizontally conveyed, to a vertical position, and to obtain a symmetric tire image by utilizing the characteristic that the tire is not easily deformed by an external force in the radial direction.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a tire level detection method which has the advantages of high detection efficiency, low cost, symmetrical imaging and the like.
The invention also provides a tire level detection device.
A tire level detecting method according to an embodiment of the first aspect of the present invention includes:
s1, horizontally placing the tire on a conveying plane A;
s2, lifting the tyre from the conveying plane a to a detection plane;
s3, acquiring the deformation of the tire in the lifting process;
and S4, acquiring a lifting stroke required for lifting the axial center of the tire to a detection central plane according to the deformation of the tire in the lifting process, wherein the detection central plane is positioned above the detection plane.
According to the tire level detection method provided by the embodiment of the invention, high efficiency and low cost can be ensured, the imaging symmetry of the tire can be ensured, and the method is suitable for automatic judgment of tire defects.
In addition, the tire level detecting method according to the embodiment of the present invention has the following additional technical features:
according to some embodiments of the present invention, when the tire position lowest point reaches the detection plane, the amount of deformation of the tire generated during lifting is acquired.
Further, the deformation amount of the tire is calculated according to the following formula:
y＝Y1-C1，
wherein Y is the amount of deformation of the tire during lifting, Y1 is the first lifting stroke when the lowest point of the tire reaches the detection plane, and C1 is the distance between the conveying plane a and the detection plane;
in some embodiments of the present invention, obtaining the lifting stroke according to the deformation of the tire during lifting comprises:
and acquiring a total lifting stroke required for lifting the axial center of the tire to the detection central plane from an initial plane according to the deformation of the tire in the lifting process, wherein the initial plane is a radial tangent plane passing through the axial center of the tire when the tire is positioned on the conveying plane A, and the initial plane is positioned between the conveying plane A and the detection plane.
Further, the total lift stroke is calculated according to the following formula:
Y＝C-0.5W+y，
wherein Y is the total lifting stroke, C is the distance between the conveying plane A and the detection central plane, W is the width of the tire, and Y is the deformation of the tire in the lifting process.
In some embodiments of the present invention, obtaining the lifting stroke according to the deformation of the tire during lifting comprises:
acquiring a total lifting stroke required for lifting the axial center of the tire to the detection central plane from an initial plane according to the deformation of the tire in the lifting process, wherein the initial plane is a radial tangent plane passing through the axial center of the tire when the tire is positioned on the conveying plane A, and the initial plane is positioned between the conveying plane A and the detection plane;
and acquiring a second lifting stroke according to the first lifting stroke and the total lifting stroke, wherein the second lifting stroke is a stroke for continuously lifting the axial center of the tire to reach the detection central plane when the lowest point of the position of the tire reaches the detection plane.
Further, the second lift stroke is calculated according to the following formula:
Y2＝Y-Y1，
wherein Y2 is the second lift stroke, and Y is the total lift stroke.
A tire level detecting apparatus according to an embodiment of the second aspect of the present invention includes: a transfer table for horizontally placing a tire; the lifting machine is positioned above the conveying table and is suitable for grabbing the bead on the upper side surface of the tire; a sensor for detecting the deformation of the tyre during lifting; an imaging device for imaging the tire, the imaging device being located above the sensor.
The tire level detection device provided by the embodiment of the invention can ensure high efficiency and low cost, can also ensure the imaging symmetry of the tire, and is suitable for automatic judgment of tire defects.
According to some embodiments of the invention, the sensors are pairs of laser correlation sensors arranged crosswise in the radial direction of the tyre, or the sensors are laser safety light curtains.
According to some embodiments of the invention, the imaging device is an X-ray camera.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural view of a tire level detecting apparatus according to an embodiment of the present invention.
Reference numerals:
conveying table 1, lifting machine 2, motion mechanism 3, tire 4.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A tire level detecting method according to an embodiment of the first aspect of the present invention is described below with reference to the drawings.
As shown in fig. 1, a tire level detecting method according to an embodiment of the present invention includes:
s1, placing the tyre 4 horizontally on the conveying plane a;
s2, raising the tyre 4 from the conveying plane a to the detection plane a 1;
s3, obtaining the deformation of the tyre 4 in the lifting process;
s4, a lift stroke required for lifting the axial center of the tire 4 to the inspection center plane a2 is obtained based on the amount of deformation of the tire 4 generated during lifting, and the inspection center plane a2 is located above the inspection plane a 1.
According to the tire horizontal detection method provided by the embodiment of the invention, the axial center of the tire 4 in the horizontal detection mode can be positioned on line, so that the radial tangent plane passing through the axial center of the tire 4 is completely superposed with the detection central plane A2, thereby ensuring high efficiency and low cost, ensuring the imaging symmetry of the tire 4, solving the problem of poor imaging symmetry of the tire 4 and being suitable for automatic judgment of the defects of the tire 4.
According to some embodiments of the present invention, when the position lowest point of the tire 4 reaches the detection plane a1, the amount of deformation of the tire 4 generated during lifting is acquired.
Further, the deformation amount of the tire 4 is calculated according to the following formula:
y＝Y1-C1，
wherein Y is the deformation of the tire 4 during lifting, Y1 is the first lifting stroke when the lowest point of the tire 4 reaches the detection plane a1, and C1 is the distance between the conveying plane a and the detection plane a 1;
in some embodiments of the invention, obtaining the lifting stroke from the deformation of tyre 4 during lifting comprises the following steps:
the total lifting stroke required to lift the axial center of the tire 4 from the initial plane A3 to the inspection center plane a2 is obtained based on the amount of deformation of the tire 4 during lifting, the initial plane A3 being a radial tangent plane passing through the axial center of the tire 4 when the tire 4 is located in the transfer plane a, the initial plane A3 being located between the transfer plane a and the inspection plane a 1.
Further, the total lift stroke is calculated according to the following formula:
Y＝C-0.5W+y，
where Y is the total lift stroke, C is the distance between the conveying plane a and the detection center plane a2, W is the width of the tire 4, and Y is the amount of deformation of the tire 4 during the lifting process.
In some embodiments of the invention, obtaining the lifting stroke according to the deformation of tyre 4 during lifting comprises the following steps:
obtaining a total lifting stroke required to lift the axial center of the tire 4 from an initial plane A3 to a detection center plane a2, the initial plane A3 being a radial tangent plane passing through the axial center of the tire 4 when the tire 4 is located at the transfer plane a, the initial plane A3 being located between the transfer plane a and the detection plane a1, based on the amount of deformation of the tire 4 during lifting;
a second lifting stroke, which is a stroke required to continue lifting until the axial center of the tire 4 reaches the detection center plane a2 when the position lowest point of the tire 4 reaches the detection plane a1, is obtained from the first lifting stroke and the total lifting stroke.
Further, the second lift stroke is calculated according to the following formula:
Y2＝Y-Y1，
wherein Y2 is the second lift stroke, and Y is the total lift stroke.
As shown in fig. 1, a tire level detecting apparatus according to an embodiment of the second aspect of the present invention includes: conveying table 1, lifting machine 2, sensor and image device.
Specifically, the transfer table 1 is used for horizontally placing the tire 4. The elevator 2 is positioned above the conveying table 1, and the moving mechanism 3 of the elevator 2 is suitable for grabbing the bead on the upper side surface of the tire 4. The sensors are used to detect the amount of deformation of tyre 4 during lifting, the detection plane a1 being defined by the sensors. The imaging device is used to image the tyre 4, the imaging device being located above the sensor at a distance C2 from the sensor, the detection centre plane a2 being defined by the imaging device. For example, the sensors may be pairs of laser correlation sensors arranged crosswise in the radial direction of the tyre 4, or the sensors may be laser safety light curtains; the imaging device may be an X-ray camera.
With the tire 4 placed horizontally, it is a photographing timing when the hoist 2 lifts the tire 4 to the position where the radial tangential plane passing through the axial center of the tire 4 coincides with the detection center plane a2, that is, when the axial center of the tire 4 reaches the detection center plane a2, X-ray photographing imaging is performed on the tire 4.
It has been found through studies that, in actual operation, the radial section of the tire 4 passing through the axial center cannot be identified, and therefore, the determination can be made only by the distance S between the radial section of the tire 4 passing through the axial center and the detection center plane a2 (i.e., the image forming device), that is, when the tire 4 is lifted by the distance S, the determination is made that the radial section of the tire 4 passing through the axial center coincides with the detection center plane a2, and the distance S is obtained from the lifting stroke of the lifter 2. However, since the tire 4 is deformed by y1 and y2 at the bead during the lifting process, the actual stroke of the lifter 2 is larger than the distance S, and in this case, searching for the shooting timing according to the distance S causes a large error in the detection result.
For this purpose, the present invention provides a sensor at a position in the lifting stroke of the tire 4 to form a detection plane a1, the distance between the detection plane a1 and the conveying plane a is C1, and the sensor detects the lowest point of the bottom surface of the tire 4 and records the stroke Y1 of the elevator 2, at which the deformation Y of the tire 4 during lifting is Y1-C1, so that the lifting distance actually required to obtain the overlapping state of the radial tangent plane passing through the axial center of the tire 4 and the detection center plane a2 is C-10.5W + Y, i.e., C-0.5W + Y1-C1. Thus, the tire 4 can be lifted to a predetermined position for X-ray detection based on the lifting distance given above.
According to the tire 4 detecting apparatus of the embodiment of the present invention, a detecting plane a1 is established by using an additional high-precision sensor, and the deformation parameter of the tire 4 is determined from the detecting plane a1, thereby calculating the axial center of the tire 4 after deformation.
It can be understood that when the tyre 4 is not deformed, y is equal to 0, the distance L that the servomotor of the kinematic mechanism 3 needs to move is equal to C-0.5w, and the radial section through the axial center of the tyre 4 coincides with the detection central plane a2 (for shooting);
when the moving mechanism 3 grabs the seam allowance on the upper side of the tire 4 and moves the tire 4 horizontally upwards, firstly the upper side of the tire 4 is deformed by y1 under the influence of the moving mechanism 3 and the self gravity, and after the tire 4 leaves the conveying plane, the lower side of the tire 4 is deformed by y2 under the influence of the gravity.
Wherein when the sensor detects that the underside of tyre 4 contains deformation y2, y1+ y 2; when the sensor detects that the underside of the tyre 4 does not contain the deformation y2, y is y 1.
However, whether Y2 is included or not, when the sensor detects the lower side surface of the tire 4 (i.e., the lowest point of the lower side surface of the tire 4 reaches the detection plane a1), the total deformation amount Y becomes Y1-C1 according to the movement distance Y1 of the servo motor of the movement mechanism 3.
Thus, the calculation formula for the position of the radial section of the tire 4 passing through the axial center is:
Y＝C-(0.5w-y)＝C-0.5W+Y1-C1。
according to the tire level detection device of the embodiment of the invention, when the mechanism grabs the tire 4 which is horizontally placed and moves vertically upwards, a detection plane is constructed through an additional high-precision sensor, the lower side surface of the tire 4 is dynamically detected, and the position is recorded. Then, according to the inherent parameters of the tire 4, the modeling calculation and correction are carried out by combining the feedback data of the servo motor of the movement mechanism 3, so that the axial center of the detected tire 4 is determined, the high efficiency and the low cost can be ensured, the imaging symmetry of the tire 4 can also be ensured, and the method is suitable for automatically judging the defects of the tire 4.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, "a first feature" or "a second feature" may include one or more of the features, and the first feature "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact with each other through another feature therebetween. The first feature being "on," "over" and "above" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "a specific embodiment," "an example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. A tire level detection method, comprising:
s1, horizontally placing the tire on a conveying plane A;
s2, lifting the tyre from the conveying plane a to a detection plane;
s3, when the lowest point of the tire reaches the detection plane, acquiring the deformation of the tire in the lifting process, and calculating the deformation of the tire according to the following formula:
y＝Y1-C1，
wherein Y is the amount of deformation of the tire during lifting, Y1 is the first lifting stroke when the lowest point of the tire reaches the detection plane, and C1 is the distance between the conveying plane a and the detection plane;
s4, obtaining a total lifting stroke required for lifting the axial center of the tire from an initial plane to a detection center plane according to the deformation of the tire during lifting, where the initial plane is a radial tangent plane passing through the axial center of the tire when the tire is located on the conveying plane a, the initial plane is located between the conveying plane a and the detection plane, and the total lifting stroke is calculated according to the following formula:
Y＝C-0.5W+y，
wherein Y is the total lifting stroke, C is the distance between the conveying plane A and the detection central plane, W is the width of the tire, and Y is the deformation of the tire in the lifting process,
the detection central plane is positioned above the detection plane.
2. The tire level detecting method according to claim 1, wherein obtaining the lifting stroke based on the amount of deformation of the tire during lifting comprises:
acquiring a total lifting stroke required for lifting the axial center of the tire to the detection central plane from an initial plane according to the deformation of the tire in the lifting process, wherein the initial plane is a radial tangent plane passing through the axial center of the tire when the tire is positioned on the conveying plane A, and the initial plane is positioned between the conveying plane A and the detection plane;
and acquiring a second lifting stroke according to the first lifting stroke and the total lifting stroke, wherein the second lifting stroke is a stroke for continuously lifting the axial center of the tire to reach the detection central plane when the lowest point of the position of the tire reaches the detection plane.
3. The tire level detecting method according to claim 2, wherein the second lift stroke is calculated according to the following formula:
Y2＝Y-Y1，
wherein Y2 is the second lift stroke, and Y is the total lift stroke.
4. A tire level detecting apparatus to which the tire level detecting method according to any one of claims 1 to 3 is applied, the tire level detecting apparatus comprising:
a transfer table for horizontally placing a tire;
the lifting machine is positioned above the conveying table and is suitable for grabbing the bead on the upper side surface of the tire;
a sensor for detecting the deformation of the tyre during lifting;
an imaging device for imaging the tire, the imaging device being located above the sensor.
5. The tire level detecting device according to claim 4, wherein the sensor is a plurality of pairs of laser correlation sensors arranged crosswise in a radial direction of the tire, or the sensor is a laser safety light curtain.
6. The tire level detecting device according to claim 4, wherein the imaging device is an X-ray camera.
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| CN201811217656.3A CN109254021B (en) | 2018-10-18 | 2018-10-18 | Tire level detection method and tire level detection device |
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