JPH0593702A - Device for automatically inspecting pinhole in coated film - Google Patents

Abstract

PURPOSE:To obtain a device for automatically inspecting pinholes in coated films which can automatically inspect pinholes in coated films and, at the same time, can automatically put marks at the positions of detected pinholes. CONSTITUTION:A pinhole inspecting device equipped with a marking means 39 is incorporated in a self-propelled vehicle 20 which is provided at least with a driving source 21, electromagnet 22, and gyro 23 and runs on a magnetic substance 4 coated with a film 3 by adjusting the electromagnetic force of the electromagnet 22 based on the attitude of the vehicle 20 detected by means of the gyro 23. Therefore, pinhole inspections can be performed automatically regardless of the inclination of the wall face to be inspected of the film 3 and, at the same time, the positions of detected pinholes can be marked automatically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has at least a drive source, an electromagnet, and a gyro, and adjusts the electromagnetic force of the electromagnet on the basis of the posture detected by the gyro while applying a coating film on the surface, for example. The present invention relates to a coating film pinhole automatic inspection device that automatically checks a coating film for pinholes while running on a magnetic material such as a steel plate.

[0002]

2. Description of the Related Art When touching up a coating film on a steel sheet having a surface coated or coated with a coating film, it is necessary to detect the location of the pinhole in advance.

FIG. 6 shows a conventional pinhole detection method. That is, one of the terminals of the pinhole inspection device for causing a potential difference by standing on the steel plate 4 with the coating film 3 on the surface with the worker 1 having the body 2 of the pinhole inspection device attached to the waist. Is connected to the steel plate 4 and the other is connected to the mop 5 containing water, and the worker 1 holds the handle 5a of the mop 5 in his hand and slides the mop 5 on the steel plate 4 to clean the floor. We are conducting pinhole inspection. When there is a pinhole and the mop 5 comes to this pinhole position, the pinhole inspection device is
Sounds the buzzer 6 provided at the position to inform the worker 1 that there is a pinhole at the mop position. The worker 1 marks near the position of the mop 5 when the buzzer 6 sounds, and later repaints the marked neighborhood.

FIG. 7 shows an equivalent circuit of the above-mentioned conventional pinhole inspection apparatus. In the figure, 6 is a buzzer connected in parallel to a power source 8 via a switch 7, 9 is a current detecting means for detecting a current flowing between the steel plate 4 and the mop 5, and 10 is a current detecting means 9 for detecting a current. , Pinhole determining means for determining that there is a pinhole and closing the normally open contact of the switch 7.

[0005]

Since the conventional pinhole inspection apparatus is constructed as described above and performs the pinhole inspection manually, it is possible to perform the pinhole inspection on a large scale such as a ship or a bridge. Has a problem that the work is troublesome, and it is dangerous work when it reaches a high side wall or a ceiling surface, and it is difficult to ensure safety and it takes time to perform the work.

In view of the above points, the present invention makes it possible to automatically perform a pinhole inspection regardless of the angle of the wall surface on which the pinhole inspection of the coating film is performed, and to determine the location of the pinhole. The object is to obtain an automatic pinhole inspection device for a coating film that can be automatically marked.

[0007]

An automatic pinhole inspection system for a coating film according to the present invention has at least a drive source, an electromagnet, and a gyro, and adjusts the electromagnetic force of the electromagnet based on the posture detected by the gyro. A self-propelled vehicle that adsorbs and travels on a magnetic substance with a coating on the surface, a tank that is built into this self-propelled vehicle and that stores a solution for pinhole detection, and a drooping part at the bottom of this tank. Is supported via a conductive bearing ring at the end of a stretchable support member provided in
A water absorbing roller rolling on the magnetic body, a pump for supplying a pinhole detecting solution from the tank to the water absorbing roller, and a current detection for detecting conduction between the water absorbing roller and the magnetic body. Means and the current value detected by the current detection means and a preset current value are compared, and when the detected current value exceeds the set value, it is determined that there is a pinhole, and the marking means automatically It is provided with pinhole determining means for marking the pinhole location in the traveling direction of the vehicle.

[0008]

In the present invention, the pinhole inspection device is incorporated in a self-propelled vehicle that has a tank in which a solution for pinhole detection is stored and that travels by adsorption on a magnetic material having a coating film on its surface. The water absorbing roller, which is one terminal for generating the potential difference, rolls on the magnetic body while being constantly supplied with the pinhole detecting solution. The pinhole determining means compares the current value flowing between the water absorbing roller and the conductor detected by the current detecting means with a preset current value, and when the detected current value exceeds the set value, the pinhole is detected. If there is, the marking means is caused to mark the pinhole location in the traveling direction of the vehicle.

[0009]

The present invention will be described below with reference to the illustrated embodiments.

FIG. 1 is a side view showing the structure of an automatic pinhole inspection system for coating films according to an embodiment of the present invention, FIG. 2 is its plan view, FIG. 3 is its front view, and FIG. 4 is its pinhole detection. FIG. 5 is an exploded perspective view of a switching valve installed in the tank in which the working solution is stored, and FIG. 5 is an equivalent circuit diagram thereof. In each of the drawings, portions corresponding to the conventional ones are denoted by the same reference numerals. In the figure, 2
Reference numeral 0 denotes at least a drive motor 21, an electromagnet 22, and a gyro 23. The electromagnetic travel of the electromagnet 22 is adjusted based on the posture detected by the gyro 23 while adsorbing and traveling on the steel plate 4 having the surface coated with the coating film 3. Self-propelled vehicle, 24 is self-propelled vehicle 20
A tank that stores the pinhole detection solution that is placed and fixed on the upper surface of the device and partially protrudes forward, and that has a surface tension of 47 dyn / cm or less and that does not produce a residue after evaporation to dryness, 25 is a tank Telescopic pipes installed at two places on the left and right of the lower surface of the projecting portion of 24, a first pipe 25a having one end fixed to the lower surface of the tank 24 and a slidable fitting in the first pipe 25a. And a second pipe 25b that extends and contracts from its end, and a pressing spring 26 that constantly urges the second pipe 25b in the extending direction is provided inside each of the first pipes 25a.

At the end of each second pipe 25b, a sponge roller 28 having a porous ceramic pipe 27 at its axial center is supported via a highly conductive bearing ring (copper ring, for example).

As shown in FIG. 3, the sponge roller 28 has slits 28a formed at the connecting portions with the respective second pipes 25b, and each slit 28a is pushed open only on the side of the second pipe 25b. ..

A solution supply pipe 30 connected to a pump 29 installed on the tank 24 side is connected at one end to the porous ceramic pipe 27 by a pipe joint 31 so as to be relatively rotatable.
When the pump 29 is driven, the pinhole detection solution in the tank 24 is supplied into the porous ceramic pipe 27 through the solution supply pipe 30. And
The pinhole detection solution supplied into the porous ceramic pipe 27 receives back pressure from the pump 29 and uniformly exudes from the inside of the porous ceramic pipe 27 to the entire outer surface thereof and permeates the sponge roller 28.

At the center of the inside of the tank 24, a rotary switching valve 3 is connected to a pump 29 through a connecting pipe 32.
No. 3 is installed, the pump 29 uses the function of the switching valve 33 regardless of the position of the pinhole detection solution in the tank 24, that is, whatever the position of the self-propelled vehicle 20. The pinhole detecting solution in 24 can be surely sucked.

That is, as shown in FIG. 4, the switching valve 33 has eight solution suction pipes 34a, 34b, on the side wall 35a.
One end of each of 34c, 34d, 34e, 34f, 34g, and 34h is a cylindrical outer drum 35 having a bottom, which is connected and communicated with each other at the same axial direction setting positions so as to match the axial setting positions. A hole 36 which is made of a bottomed cylindrical body which is closely fitted and which can selectively communicate with any one of the solution suction pipe connecting holes of the side wall 35a of the outer drum 35 at a part of the side wall 36a thereof.
b is formed, and at the axial center of the bottom 36c thereof,
A valve switching step motor 3 installed on the lower surface of the tank 24 through a hole 35c formed in the bottom portion 35b of the outer drum 35.
7 (see FIG. 3), an inner drum 36 provided with a shaft 36d that is connected to the output shaft, and the inner drum 36 is rotatably sealed in the outer drum 35 and connected to the pump 29 at the shaft center. One end of the pipe 32 is composed of a lid member 38 connected to and communicated with the other end.

Solution suction pipes 34a, 34b, 34c, 34
As shown in FIG. 2, d, 34e, 34f, 34g and 34h have solution suction pipes 34a, 34b, 34c and 34d whose ends extend to the four corners of the tank 24 and are bent downward at the four corners. And the solution suction pipes 34e, 34f, 34
The ends of g and 34h extend to the vicinity of the central portion of the four sides formed by the peripheral side wall of the tank 24, and are bent upward near the central portions of the four sides.

Marking means 39 is provided on one side of the lower surface of the projecting portion of the tank 24 so as to be positioned behind the telescopic pipe 25 and mark a pinhole location in the traveling direction of the vehicle. Has been.

The marking means 39 includes a marking pen support cylinder 40 having one end fixed to the lower surface of the protruding portion of the tank 24 and a penetrating shaft 41 which is loosely fitted in the marking pen support cylinder 40 and expands and contracts from its end. A return spring 42 mounted elastically between an outward flange formed on the inner end of the marking pen support cylinder of the peeling shaft 41 and an inward flange formed on the end of the marking pen support cylinder 40, and marking of the peeling shaft 41. An actuator 43 composed of a solenoid or the like installed in the marking pen support cylinder 40 so as to be engageable with the inner end surface of the pen support cylinder, is connected to the end of the peeling shaft 41 through a deformed shaft joint 44, and extends outward in the horizontal direction. In addition, the marking pen is attached such that the end thereof bends to the side of the sponge roller 28 and further bends downward at a position slightly rearward of the axis of the sponge roller 28. 45, a marking pen mounting cylinder 45
And a marking pen 46 made of a felt pen or the like, which is attached to the steel plate 4 in a floating state at the end thereof.

In FIG. 1 to FIG. 3, 47 is a pinhole detecting solution replenishing port provided in the upper part of the tank 24, 4
8 is the cap, 49 is the breathing hole 5 in the upper part of the tank 24
0 (see FIG. 2) is a check valve installed inside, 60 is a control device housing arranged at the rear of the tank 24, and 61 is a power cable.

Next, the configuration of the control unit of the apparatus of this embodiment is shown in FIG.
It will be described based on an equivalent circuit diagram of.

Reference numeral 51 is a power supply for the drive motor 21, electromagnet 22, pump 29, valve switching step motor 37, and actuator 43, and 52 is a sponge roller 28 and steel plate 4.
And 53 is a current detecting means for detecting conduction between the sponge roller 28 and the steel plate 4.

Reference numeral 54 denotes a pinhole determination unit, which compares the current value detected by the current detection means 53 with a current value preset according to the material of the magnetic material such as the steel plate 4 to detect the detected current value. Is larger than the set value, it is determined that there is a pinhole, the actuator 43 of the marking means 39 is operated, the peeling shaft 41 is lowered against the resilience of the return spring 42, and the marking pen 46 automatically operates. The marking is made at the pinhole location in the traveling direction of the vehicle.

An attitude determination unit 55 determines the attitude of the self-propelled vehicle 20 based on the detection result of the gyro 23 and outputs an attitude signal.

Reference numeral 56 denotes an electromagnet control section, which is an attitude determination section 5
The electromagnetic force of the electromagnet 22 is adjusted based on the input of the attitude signal from the vehicle 5, so that the self-propelled vehicle 20 can be adsorbed even on the vertical wall surface or the ceiling surface.

A switching valve motor control unit 57 controls the valve switching step motor 37 based on the input of a posture signal from the posture determination unit 55, switches the rotary switching valve 33, and pinholes in the tank 24. The solution suction pipe that opens on the side where the detection solution is biased is selected, and the selected solution suction pipe and the pump 29 are connected in communication, and the pump 29 and the solution suction pipe are connected in communication so that the solution can be supplied. The solution supply permission signal for notifying that the condition is reached is output.

A drive motor control unit 58 controls the torque of the drive motor 21 of the self-propelled vehicle 20 based on the input of the posture signal from the posture determination unit 55, and the self-propelled vehicle 20 starts traveling. A running start signal is output to inform the user of the fact.

Reference numeral 59 denotes a pump control unit which drives the pump 29 when the solution supply permission signal is input from the switching valve motor control unit 57 and when the traveling start signal is input from the drive motor control unit 58 to drive the inside of the tank 24. The solution for detecting the pinhole is supplied to the sponge roller 28.

Next, the operation of the coating film pinhole inspection apparatus of the present embodiment having the above-mentioned structure will be described. In this case, it is assumed that the power cable 61 is connected to the power source and a potential difference is generated between the sponge roller 28 and the steel plate 4.

First, when there is a start command, the attitude determination unit 55 determines the attitude of the self-propelled vehicle 20 based on the detection result of the gyro 23, and an electromagnet determines the present attitude of the self-propelled vehicle 20. The control unit 56, the switching valve motor control unit 57, and the drive motor control unit 58 are notified.

When the attitude determination unit 55 notifies the attitude of the self-propelled vehicle 20, the electromagnet control unit 56 reads the electromagnetic force corresponding to the attitude of the self-propelled vehicle 20 from the memory and sets the electromagnet so that the read electromagnetic force is obtained. The electric current flowing through the coil of 22 is controlled so that the self-propelled vehicle 20 is attracted to the steel plate 4.

Next, when the attitude of the vehicle 20 is notified from the attitude determination unit 55, the switching valve motor control unit 57 reads the solution suction pipe corresponding to the attitude of the vehicle 20 from the memory and reads the solution. Rotary type switching valve 3 at the suction pipe position
The stepping motor 37 for valve switching is controlled so that the hole 36b of the inner drum 36 of No. 3 comes so that the pump 29 and the tank 24 are connected and communicated with each other via the selected solution suction pipe, Notify that supply is available. This valve switching control is performed regardless of the amount of the pinhole detection solution stored in the tank 24.

Thereafter, when the drive motor control section 58 is notified of the attitude of the self-propelled vehicle 20 from the attitude determination section 55, the torque corresponding to the attitude of the self-propelled vehicle 20 is read from the memory and becomes the read torque. Thus, the current flowing to the drive motor 21 is controlled to start the traveling of the self-propelled vehicle 20, and the pump control unit 59 is notified that the self-propelled vehicle 20 has started the traveling.

The pump control unit 59 is informed that the solution can be supplied from the switching valve motor control unit 57, and that the drive motor control unit 58 further informs that the vehicle 20 has started traveling. , The pump 29 is driven, and the solution for detecting the pinhole in the tank 24 is sponge roller 28.
Supply to.

The self-propelled vehicle 20 runs and the sponge roller 28
When the supply of the pinhole detection solution is started, the pinhole determination unit 54 determines the current value detected by the current detection unit 53 and the current value preset according to the material of the magnetic material such as the steel plate 4 and the like. When the detected current value exceeds the set value, it is determined that there is a pinhole, and the marking means 39
The actuator 43 of the marking pen 4 is operated to move the peeling shaft 41 downward against the resilience of the return spring 42.
Mark the pinhole location in the direction of travel of the self-propelled vehicle by using 6.

As described above, the automatic coating film pinhole inspection apparatus according to this embodiment can automatically perform the pinhole inspection regardless of the angle of the wall surface on which the coating film pinhole is to be inspected. In addition to being able to do it, the location of the pinhole can be automatically marked.

In the embodiment described above, the self-propelled vehicle 2
It is preferable that the material of each component including 0 is made of a lightweight alloy as much as possible to reduce the weight of the vehicle body.

Further, the length of the porous ceramic pipe 27 protruding from the right and left of the sponge roller 28 may be set so that the connecting portion between each telescopic pipe 25 and the sponge roller 28 is provided outside the sponge roller. ..

Further, in the above-described embodiment, among the solution suction pipes connected to the rotary type switching valve 33, the solution suction pipes 34e, 34f, 34g, 34h whose ends are bent upwards.
Is shown in the vicinity of the center of the four sides of the peripheral wall of the tank 24. The solution suction pipes 34e, 34
f, 34g, and 34h may be arranged at the corners of the tank, respectively. In this case, there is an advantage that it becomes easier to cope with various postures of the vehicle 20.

[0039]

As described above, according to the present invention, at least a drive source, an electromagnet, and a gyro are provided, and a coating film is formed on the surface while adjusting the electromagnetic force of the electromagnet based on the posture detected by the gyro. Since a pinhole inspection device equipped with marking means is incorporated into a self-propelled vehicle that attracts and travels on a magnetic material that has been subjected to a coating, no matter what angle the wall surface for pinhole inspection of the coating film has There is an effect that the hole inspection can be automatically performed, and the location of the pinhole can be automatically marked.

[Brief description of drawings]

FIG. 1 is a side view of an apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of an apparatus according to an embodiment of the present invention.

FIG. 3 is a front view of an apparatus according to an embodiment of the present invention.

FIG. 4 is an exploded perspective view of a switching valve installed in the tank of the apparatus according to the embodiment of the present invention.

FIG. 5 is an equivalent circuit diagram of an apparatus according to an embodiment of the present invention.

FIG. 6 is an explanatory diagram for explaining a conventional pinhole detection method.

FIG. 7 is an equivalent circuit diagram of a conventional pinhole inspection device.

[Explanation of symbols]

 3 coating film 4 steel plate (magnetic material) 20 self-propelled vehicle 21 driving motor (driving source) 22 electromagnet 23 gyro 24 tank 25 telescopic pipe (supporting member) 28 sponge roller (water absorbing roller) 29 pump 39 marking means 53 current detection Means 54 Pinhole determination unit

Front Page Continuation (72) Inventor Susumu Nakamura 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (1)

[Claims] 1. A motor having at least a drive source, an electromagnet, and a gyro, and adsorbing and traveling on a magnetic body having a surface coated with a magnetic material while adjusting the electromagnetic force of the electromagnet based on the posture detected by the gyro. A running car, a tank that is built into this self-driving car and that stores the solution for pinhole detection inside, and a conductive bearing ring at the end of a stretchable support member that hangs down at the bottom of this tank. A water-absorbing roller that is supported via the magnetic body, rolls on the magnetic body, a pump for supplying a pinhole detection solution from the tank to the water-absorbing roller, and a conduction between the water-absorbing roller and the magnetic body. The current detection means for detecting the current is compared with the current value detected by this current detection means and the preset current value, and if the detected current value exceeds the set value, it is determined that there is a pinhole. , Merkin Pinhole automatic inspection apparatus of the coating, characterized in that it comprises a pinhole judging means for marking the pinhole location of the self-propelled vehicle traveling direction means.