JP6919303B2 - Appearance shape inspection system for pneumatic fenders - Google Patents

Description

The present invention relates to an appearance shape inspection system for a pneumatic fender, and more particularly to an inspection system capable of accurately inspecting the appearance shape of an expanded pneumatic fender.

The air fender is used in a state of being inflated with a relatively high internal pressure. Therefore, it is important that the pneumatic fender has a specified pressure resistance. It is also important that the external dimensions of the pneumatic fender are within the specified allowable range when expanded at a predetermined internal pressure.

The external dimensions of the inflated pneumatic fender can be measured manually using, for example, a tape measure. However, manual measurement is difficult for large-sized pneumatic fenders. Therefore, regardless of the size, there is room for improvement in accurately inspecting the appearance shape of the inflated pneumatic fender.

By the way, various monitoring systems for monitoring the state of the pneumatic fender in use have been proposed (see, for example, Patent Documents 1 and 2). In general, these conventional monitoring systems are configured such that an instrument such as a pressure gauge is arranged inside the fender, and the detection data by the instrument is wirelessly transmitted and received by the receiver. That is, since the conventional monitoring system does not have a function of grasping the outer shape state of the pneumatic fender, it is not possible to grasp the outer dimensions of the pneumatic fender in the expanded state.

JP-A-2010-175298 Japanese Unexamined Patent Publication No. 2013-65532

An object of the present invention is to provide an appearance shape inspection system for a pneumatic fender that can accurately inspect the appearance shape of an expanded pneumatic fender.

The appearance shape inspection system of the pneumatic fender of the present invention that achieves the above object is a front-view imaging device for acquiring image data of the front view outer shape of the pneumatic fret in an expanded state, or the pneumatic fender. At least one of the side view photographing devices for acquiring the image data of the outer shape of the side view, the pressure sensor for detecting the internal pressure of the pneumatic fender, and the control for inputting the image data and the detection data by the pressure sensor. A unit and a monitor for displaying the image data are provided, and the outer shape of the pneumatic fender at a predetermined internal pressure is preset based on the detection data of the pressure sensor and the image data. It is characterized in that the configuration is such that whether or not it is within the permissible range is determined by the control unit.

According to the present invention, image data of the outer shape of the inflated pneumatic fender in front view or side view is acquired by a photographing device and displayed on a monitor. Therefore, the appearance state of the pneumatic fender in the state of being expanded at the specified internal pressure can be safely grasped by the image data displayed on the monitor. Then, based on the image data and the data detected by the pressure sensor, the control unit determines whether or not the outer shape of the pneumatic fender at the specified internal pressure is within the permissible range. Based on this determination, the pneumatic fender is determined. It becomes easier to determine whether or not there is an abnormality in the appearance shape of the starboard, and it becomes possible to inspect the appearance shape with high accuracy.

It is explanatory drawing which shows the application example of the appearance shape inspection system of this invention in front view of a fender. It is explanatory drawing which shows the appearance shape inspection system of FIG. 1 in the plan view of the fender material. It is explanatory drawing which illustrates the reference data of the fender material in the front view of the fender material. It is explanatory drawing which illustrates the reference data of the fender material from the side view of the fender material. It is explanatory drawing which illustrates the image data of the fender material photographed by the front view photographing apparatus. It is explanatory drawing which illustrates the image data of the fender material acquired by the side view photographing apparatus.

Hereinafter, the appearance shape inspection system for the pneumatic fender of the present invention will be described based on the embodiment shown in the figure.

The appearance shape inspection system 1 (hereinafter referred to as inspection system 1) of the pneumatic fender of the present invention exemplified in FIGS. 1 and 2 is a pneumatic fender 7 (hereinafter referred to as fender 7) in a manufacturing factory or the like. It is used as a part of quality inspection. The fender 7 is formed by connecting hemispherical mirror portions 7b to both ends of the cylindrical portion 7a. The mouthpiece 7c is provided on, for example, one mirror portion 7b. In this embodiment, the surface of the fender 7 is provided with a visible identification line HL extending in the cylindrical axis direction of the cylindrical portion 7a and a visible annular identification line VL extending in the circumferential direction of the cylindrical portion 7a. Has been done.

The system 1 controls the front view photographing device 2a for acquiring the image data of the front view outer shape of the fender material 7 and the side view photographing device 2b for acquiring the side view outer shape image data of the fender material 7. A unit 3, a monitor 4, and a pressure sensor 5a are provided. The front view of the fender 7 is a field of view from a direction substantially orthogonal to the cylindrical axis direction of the cylindrical portion 7a. The side view of the fender 7 is a field of view from a direction substantially parallel to the axial direction of the cylindrical portion 7a.

As the front view photographing device 2a and the side view photographing device 2b, for example, a digital video camera or the like is used. A computer or the like is used as the control unit 3. The pressure sensor 5a detects the internal pressure P of the fender 7.

The system 1 of this embodiment further includes a temperature sensor 5b and a warning device 6. In this embodiment, the temperature sensor 5b detects the external environmental temperature T1 of the fender 7. When inspecting the external shape of the fender 7, the external environmental temperature T1 and the internal temperature T2 of the fender 7 are substantially the same, so that the temperature sensor 5b detects either the external environmental temperature T1 or the internal temperature T2. Anything is fine. Examples of the warning device 6 include warning lights and alarms.

The image data acquired by the front view photographing device 2a and the side view photographing device 2b is input to the control unit 3 by wireless or wired communication. The detection data by the pressure sensor 5a and the temperature sensor 5b are also input to the control unit 3 by wireless or wired communication, respectively. The monitor 4 and the warning device 6 are connected to the control unit 3 wirelessly or by wire.

The configuration may be such that at least one of the front view photographing device 2a and the side view photographing device 2b is provided for one fender 7, but it is also possible to have a configuration in which both are provided. The front view photographing device 2a and the side view photographing device 2b are not limited to one each for one fender 7, and a plurality of units may be provided. For example, in order to photograph each mirror portion 7b of the fender 7, a configuration may be provided in which two side view photographing devices 2b are opposed to each other.

The image data input to the control unit 3 is displayed on the monitor 4. The image data acquired by the front-view imaging device 2a and the side-view imaging device 2b may be displayed on the monitor 4 at the same time, or one of the image data may be selectively displayed on the monitor 4. You can also. It is also possible to display each detection data (data of internal pressure P, data of temperatures T1 and T2) input to the control unit 3 on the monitor 4.

Reference data of the outer shape when the fender 7 is expanded with the specified internal pressure Px and allowable limit data with respect to the reference data are input to the control unit 3. Examples of the specified internal pressure Px include an internal pressure in which the fender 7 is not substantially stretched or compressed (neutral state), a guaranteed internal pressure of the fender 7, and the like.

Specifically, as the reference data, as shown in FIGS. 3 and 4, the reference length L (maximum length L in the tubular axis direction), the reference width W (maximum width W in the direction orthogonal to the tubular axis direction), A reference outer diameter D (maximum outer diameter D) can be exemplified. The reference width W and the reference outer diameter D have basically the same dimensions. Further, the reference outer peripheral length C (maximum outer peripheral length C) can be set as the reference data. The reference outer peripheral length C is calculated by (reference outer diameter D) × π.

Since the maximum width W in the direction orthogonal to the tubular axis direction is generally the width at the center position of the fender 7 in the tubular axis direction, the maximum outer diameter D and the maximum outer peripheral length C are also fenders, respectively. It is the outer diameter and the outer peripheral length at the center position in the tubular axis direction of 7. When the guaranteed internal pressure of the fender 7 is set to the specified internal pressure Px, for example, the reference data is determined by FEM analysis of the design model of the fender 7 in the state where the specified internal pressure Px is set.

Allowable upper limit dimensions Specifically acceptable limits data, the allowable upper limit dimension for the reference length L X _L and the minimum allowable dimension M _L, allowable with respect to the reference width W upper dimension X _W and the minimum allowable dimension M _W, relative to the reference outer diameter D Examples thereof include X _{D, the} allowable lower limit dimension M _D , the allowable upper limit dimension X _{C with} respect to the reference outer peripheral length C, and the allowable lower limit dimension M _C.

Therefore, the length tolerance of the fender 7 when inflated to the specified internal pressure Px is equal to or less than _(L-M L) or _(L + X L). Tolerance similarly width of fender 7, _(W-M W) or _(W + X W) or less, the allowable range of the outside diameter, _(D-M D) or _(D + X D) or less, the outer peripheral length tolerance, equal to or less than _(C-M C) or _(C + X C).

Next, a method of inspecting the appearance shape of the inflated fender 7 using this system 1 will be described.

As illustrated in FIGS. 1 and 2, the fender 7 is placed horizontally on a flat surface, and air is injected from the base portion 7c into the fender 7 until the internal pressure P reaches the specified internal pressure Px. 5. As illustrated in FIG. 6, the fender 7 is expanded.

In the process of increasing the internal pressure P of the fender 7 to the specified internal pressure Px, the front view image data and the side view image data of the fender 7 are sequentially transferred by the front view photographing device 2a and the side view photographing device 2b, respectively. At the same time, the data of the internal pressure P is sequentially detected by the pressure sensor 5a. Further, the temperature sensor 5b detects the data of the external environmental temperature T1 in this process.

The acquired image data, the internal pressure P data, and the external environmental temperature T1 data are sequentially input to the control unit 3. Each image data is sequentially displayed on the monitor 4 (displayed in substantially real time). Further, these data are stored in the control unit 3.

The control unit 3 recognizes the boundary between the fender 7 and the background of the fender 7 based on the contrast in the image data. As a result, the maximum length L1 of the fender 7 in the front view in the tubular axis direction, the maximum width W1 in the direction orthogonal to the tubular axis direction, the maximum outer diameter D1 (D2) in the side view, and the maximum circumference in the image data. The direction length C1 is sequentially specified. The maximum circumferential length C1 is calculated by the specified maximum outer diameter D1 × π.

Here, the control unit 3 determines whether or not the outer shape of the fender 7 is within a preset allowable range based on the image data. Specifically, comparing the following permissible range _(L-M L) than the above maximum length L1 that specified _(L + X L). Similarly, the tolerance described above the maximum width W1 of the specified _(W-M W) or _(W + X W) or less and to compare, specified maximum outer diameter D1 (D2) and allowable range described above _(D-M D) or _(D + X D) is compared with the following, to compare the permissible ranges described above a maximum circumferential length C1 that specified _(C-M C) or _(C + X C) or less.

As a result of each of the above comparisons, if all the compared items are within the respective permissible ranges, it is determined that there is no abnormality in the appearance shape of the fender 7. On the other hand, if even one item outside the permissible range exists, it is determined that the appearance shape of the fender 7 is abnormal in principle. Note that the determination of the abnormality presence or absence of the external shape, in a simple manner, and only to compare the following specified maximum outer diameter D1 (D2) and allowable range described above _(D-M D) or _(D + X D) configuration , or it may be the only the configuration is compared with the tolerance described above the maximum circumferential length C1 that specified _(C-M C) or _(C + X C) or less.

In this embodiment, when it is determined that the appearance shape of the fender 7 is abnormal, the warning device 6 is operated according to the instruction of the control unit 3 to issue a warning. By this warning, the operator can clearly recognize that the appearance shape of the fender 7 is abnormal.

In the inspection system 1 of the present invention, the appearance state of the expanding fender 7 can be safely grasped by the image data displayed on the monitor 4. Then, based on this image data and the data of the internal pressure P detected by the pressure sensor 5a, the control unit 3 quantitatively determines whether or not the outer shape of the fender 7 at the specified internal pressure Px is within a preset allowable range. Is judged by. Therefore, it becomes easy to determine the presence or absence of an abnormality in the appearance shape of the fender 7, and the appearance shape can be inspected with high accuracy. Appropriate measures such as re-inspection, repair, and suspension of shipment will be taken for the fender 7 that is determined to have an abnormality in its external shape.

The reference length L is not limited to the maximum length L of the fender 7 in the tubular axis direction, and may be, for example, the length of the identification line HL. The reference width W is not limited to the maximum width W in the direction orthogonal to the tubular axis direction of the fender 7, for example, the width dimension of the fender 7 (height dimension in the figure) at the position of the identification line VL. You can also. The reference outer diameter D is not limited to the maximum outer diameter D of the fender 7 and may be, for example, the outer diameter of the fender 7 at the position of the identification line VL. The reference outer peripheral length C is not limited to the maximum outer peripheral length C of the fender material 7, and may be, for example, the outer peripheral length of the fender material 7 at the position of the identification line VL.

Since the maximum outer diameter D1 basically has the same dimensions as the maximum width W1, in the present invention, it is possible to specify only one of the dimensions. By specifying both the maximum outer diameter D1 and the maximum width W1 and comparing them as in this embodiment, the dimensional calculation accuracy (inspection accuracy) of the inspection system 1 can be grasped.

Further, since the maximum outer diameter D1 is basically the same as the maximum outer diameter D2, in the present invention, only one of the dimensions can be specified. By specifying both the maximum outer diameter D1 and the maximum outer diameter D2 as in this embodiment, the influence of the weight of the fender 7 on the outer diameter deformation can be grasped.

It is advantageous to inspect the appearance shape of the fender 7 more accurately by using the inspection system 1 equipped with both of the front view photographing device 2a and the side view photographing device 2b rather than the configuration provided with both of them. become.

By using the visible identification lines HL and VL (that is, the identification lines HL and VL in which the control unit 3 can easily recognize the contrast on the image data) as an index as in this embodiment, the fender 7 is used in the image data. It becomes easier to grasp the amount of deformation of the outer shape of. The identification lines HL and VL may be made fluorescent or contain a reflective material to improve visibility, and the contrast between the identification lines HL and VL and their surroundings may be made clearer in the image data. It is preferable that at least one of the identification lines HL and VL is provided on the surface of the fender 7, but if both are provided, it becomes easier to grasp the amount of deformation of the outer shape of the fender 7.

In this embodiment, the correlation between the internal pressure P and the amount of change in the outer shape of the fender 7 (outer shape state) can be grasped, but the temperature dependence of the amount of change in the outer shape of the fender 7 (outer shape state) is also grasped. be able to. That is, in this embodiment, since the inspection system 1 detects the external environmental temperature T1 by the temperature sensor 5b, the temperature and fender can be prevented by performing the above-mentioned inspection under a plurality of conditions in which the external environmental temperature T1 is different. It is possible to grasp the correlation with the amount of change in the outer shape (outer shape state) of the material 7.

1 Monitoring system 2a Front view imaging device 2b Side view imaging device 3 Control unit 4 Monitor 5a Pressure sensor 5b Temperature sensor 6 Warning device 7 Pneumatic fender 7a Cylindrical part 7b Mirror part 7c Base part HL, VL identification line

Claims (5)

At least one of a front view photographing device for acquiring image data of the front view outer shape of the inflated pneumatic fender and a side view photographing device for acquiring the side view outer shape image data of the pneumatic fender. The pressure sensor is provided with a pressure sensor for detecting the internal pressure of the pneumatic fender, a control unit for inputting the image data and the detection data by the pressure sensor, and a monitor for displaying the image data. Based on the detection data and the image data, the control unit determines whether or not the outer shape of the pneumatic fender at a preset specified internal pressure is within a preset allowable range. Appearance shape inspection system for pneumatic fenders. In the process of increasing the internal pressure of the pneumatic fender to the specified internal pressure, the image data and the detection data by the pressure sensor are sequentially input to the control unit, and the image data is sequentially displayed on the monitor. The visual shape inspection system for the pneumatic fender according to claim 1. The appearance shape inspection system for a pneumatic fender according to claim 1 or 2, further comprising a warning device that issues a warning according to an instruction from the control unit when the outer shape is determined to be out of the permissible range. The pneumatic fender according to any one of claims 1 to 3, wherein the surface of the pneumatic fender has at least a visible identification line extending in the tubular axis direction or the circumferential direction of the fender. Appearance shape inspection system for materials. The invention according to any one of claims 1 to 4, further comprising a temperature sensor that sequentially detects the internal temperature or the external environmental temperature of the pneumatic fender, and the detection data by the temperature sensor is input to the control unit. Appearance shape inspection system for pneumatic fenders.

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