JPH0571942A - Device for inspecting coating film of inner surface of can - Google Patents

Abstract

PURPOSE:To enable a state of coating film which is coated on an inner surface of a can body to be grasped smoothly and positively and at the same time an inspection efficiency and a measurement accuracy to be improved. CONSTITUTION:First and second measuring probes 70b and 70d of a film- thickness measuring equipment 7 are allowed to contact between inner and outer surfaces of a can body 2 which is carried while its bottom part is sucked by a hand part 30 and a pad 31 of a robot 3, thus enabling a coating film thickness of an inner surface of the can body 2 to be measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a can inner surface coating film inspection device for inspecting a coating film applied to the inner surface of a bottomed cylindrical can body.

[0002]

2. Description of the Related Art Generally, when manufacturing an aluminum can body, a resin is coated on the inner surface of the can body so that the contents filled inside the can body do not directly contact the inner surface of the can body. There is. Then, in order to inspect whether or not the coating film applied to the inner surface of the can body is in a desired state, the weight and the thickness of the coating film applied to the inner surface of the can body are sampled and inspected. This inspection is performed as follows.
That is, first, take out the can body before applying the resin coating from the production line, weigh it, return the measured can body to the production line, apply the resin coating, and then take out the can body again. Then, the weight is measured, and the difference between this measured weight and the measured weight of the can body before applying the coating is calculated to calculate the amount of the coating film applied to the inner surface of the can body. It is used to measure the coating film thickness at many measuring points on the can body.

[0003]

However, the inspection process of the coating amount and the coating thickness on the inner surface of the can body has heretofore been performed all by hand, and among them, the coating amount and the coating thickness are There is a problem in that the work of measuring the thickness is troublesome, the workability is poor, and it is necessary to perform the measurement with great care, so that a heavy burden is placed on the measurer. In particular, these problems are remarkable in the work of measuring the thickness of the coating film, which has many measurement points.

The present invention has been made in view of the above circumstances, and an object thereof is to smoothly and surely grasp the state of a coating film applied to the inner surface of a can body, and to inspect it. An object of the present invention is to provide an in-can coating film inspection device capable of improving efficiency and measuring accuracy.

[0005]

In order to achieve the above object, the can inner surface coating film inspection apparatus of the present invention has been carried by a carrying mechanism for adsorbing and carrying the bottom of the can body, and by this carrying mechanism. A film thickness measuring device for measuring the coating film thickness on the inner surface of the can body by a first measuring element inserted inside the opening of the can body and a second measuring element in contact with the outer peripheral surface of the can body; It is equipped with.

[0006]

In the can inner surface coating film inspection apparatus according to the present invention, the first and second measuring elements of the film thickness measuring device are provided between the inner and outer surfaces of the can body which has been conveyed by being attracted to the bottom by the conveying mechanism. The thickness of the coating film on the inner surface of the can body is measured by bringing these into contact with each other.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In these drawings, reference numeral 1 is a measuring machine main body. The measuring machine main body 1 is provided with a robot 3 for adsorbing and transporting a bottom portion of a bottomed cylindrical can body 2 and to the left and right of the robot 3. And a stocker 5 having a large number of circular projections 4 for aligning the can body 2, a weight scale 6 installed in front of one stocker 5, and the other stocker 5
And a film thickness measuring device 7 installed on the front side of the robot 3.

At the tip of the hand section 30 of the robot 3, a dish-shaped pad 31 for vacuum suction is arranged downward while being supported by a support shaft 32.
1 is provided so as to be horizontally movable, vertically movable, and rotatable around the axis of the support shaft 32 in accordance with the movement of the hand unit 30.

The film thickness measuring device 7 has a measuring end portion 70 for holding the inner and outer surfaces of the can body 2, and the measuring end portion 70 has the measuring end portion 70.
A main body 71 for determining the thickness of the coating film on the inner surface of the can body 2 when the inner and outer surfaces of the can body 2 are clamped. A first probe 70b provided at the tip of
A fixed portion 70 that rotatably supports the arm 70a.
c, a second probe 70d provided on the fixed portion 70c so as to face the first probe 70b, and a cylinder provided on the fixed portion 70c and driving the base end of the arm 70a. 70e. Then, by moving the piston rod of the cylinder 70e forward and backward, the first probe 70b is moved through the arm 70a.
Is separated from and brought into contact with the second probe 70d. Then, the first and second tracing stylus 70b, 70
In a state where the inner and outer surfaces of the can body 2 are held between d, the measurement main body 71 calculates the thickness per unit area of the coating film on the inner surface of the can body 2 by measuring the capacitance. It is like this.

The hand portion 30 of the robot 3 is provided with a sensor 33 for position alignment.
Facing each other, each of the stockers 5 is provided with a sensor 50 for detecting the position of each can body 2.
Further, facing the sensor 33, the fixed portion 70c is provided with a sensor 70f for positioning the can body 2 adsorbed on the pad 31 between the first and second probe 70b, 70d.

A controller for operating the robot 3 and collecting data from the weighing scale 6 and operating the film thickness measuring device 7 to measure the coating film thickness under the measuring machine body 1. 8 is built in. In addition, the pair of stockers 5
Is provided corresponding to the two coating lines on the inner surface of the can. In each stocker 5, 2 × 7 = 14 can bodies 2 can be placed on one line. This is because two cans are extracted from one spray machine in response to the installation of seven spray machines.

In the can inner surface coating film inspection apparatus constructed as described above, first, the can body 2 before the resin is coated on the inner surface is extracted from the first and second can inner surface coating lines, respectively. Then, the can body 4 is erected so that the openings fit into the protrusions 4 of each stocker 5. Next, the robot 3 is operated to operate the sensor 33 provided on the hand unit 30 of the robot 3.
By making the pad 31 and the center line of the bottom of the can body 2 coincide with each other by facing the sensor 50 provided in the stocker 5, the bottom of the can body 2 is adsorbed and lifted by the pad 31, and the weight scale is measured. The can 2 is placed on 6 and its weight is measured. Next, the can 2 whose measurement has been completed is placed in the stocker 5
After returning to the original position, the weight of the next can body 2 is measured.

When the weight measurement of all the can bodies 2 is completed in this way, all the can bodies 2 are returned to the original can inner surface coating line, and the resin is coated on the inner surface of the can. Then, the respective cans 2 are extracted from the respective lines again, placed on the pair of stockers 5, and then the cans 2 of the cans 2 are moved by the pad 31 of the hand portion 30 of the robot 3 by the same operation as described above. The bottom portion is sucked and lifted, the can body 2 is placed on the weight scale 6, and the weight thereof is measured. Then, the coating amount of this can body 2 is calculated by taking the difference between this measured value and the weight value measured before coating. Next, the can body 2 on the weight scale 6 is adsorbed and lifted by the pad 31 of the hand portion 30, and is conveyed above the measurement end portion 70 of the film thickness measuring instrument 7. At this time, the piston rod of the cylinder 70e of the measuring end portion 70 is moved forward to separate the first measuring element 70b from the second measuring element 70d to leave a gap therebetween. Further, by making the sensor 33 of the hand part 30 of the robot 3 face the sensor 70f, the body part of the can body 2 adsorbed to the pad 31 is moved between the first and second measuring elements 70b and 70d. After lowering the pad 31, the body of the can body 2 is inserted between the first and second measuring elements 70b and 70d, and the piston rod of the cylinder 70e is retracted. Then, the body portion of the can body 2 is sandwiched between the first and second tracing styluses 70b and 70d, and in the measurement main body portion 71 of the film thickness measuring device 7, the coating film is obtained from the obtained capacitance value. Calculate the thickness.

The thickness of the coating film is measured by dividing it into four equal parts or eight equal parts in the circumferential direction of the can body 2 and at every 10 mm intervals from the reference point of the top of the can body 2 in the longitudinal direction (vertical direction). (For example, 11 points) or 4 points (arbitrary 4 points out of 11 points) are selected and performed. When the measurement at one point is completed, the piston rod of the cylinder 70e is advanced to move the first point. With the probe 70b separated from the second probe 70d, and the can body 2 adsorbed to the pad 31 being freed from the first and second probes 70b and 70d, the axis of the support shaft 32 is rotated by a predetermined angle. The operation of rotating and / or the operation of lowering the support shaft 32 by a predetermined distance is performed to measure the coating film thickness at each point.

In this way, it is possible to smoothly and surely inspect the coating film amount of the can body 2 extracted from the line and the coating film thickness at each point of the can body 2, and based on this data, the can body can be inspected. The state of the coating film applied to the inner surface of the body can be accurately controlled, the quality of the product can be judged quickly, and the defective cans can be easily eliminated, and defective cans are generated. In such a case, processing such as investigating the cause can be promptly performed. Further, in particular, when measuring the coating film thickness on the inner surface of the can body 2, by adsorbing the bottom portion of the can body 2 with the dish-shaped pad 31, the axis of the pad 31 and the center line of the can body 2 can be easily formed. Therefore, the can body 2 adsorbed to the pad 31 can be accurately sandwiched between the first and second measuring elements 70b and 70d, and both measuring elements at each measuring point can be accurately matched. The state of being held by 70b and 70d can be kept constant. As a result, the coating film thickness can be measured under the same conditions at each measurement point, and the measurement accuracy can be improved.

[0017]

As described above, the coating film inspecting apparatus for an inner surface of a can of the present invention comprises a transport mechanism for adsorbing and transporting the bottom of the can body, and an opening portion of the can body transported by this transport mechanism. A film thickness measuring device for measuring the coating film thickness on the inner surface of the can body by the first measuring element inserted inside and the second measuring element in contact with the outer peripheral surface of the can body. From
A coating film applied to the inner surface of the can body by bringing the first and second gauge heads of the film thickness measuring device into contact with each other between the inner and outer surfaces of the can body that has been transported by being attracted to the bottom by the transport mechanism. The state of can be grasped smoothly and surely, and the inspection efficiency and the measurement accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a plan view of FIG.

[Explanation of symbols]

 2 can body 3 robot (transport mechanism) 7 film thickness measuring instrument 70b first measuring element 70d second measuring element

Claims (1)

[Claims] 1. A transport mechanism for adsorbing and transporting the bottom of a can body, a first gauge head inserted into the inside of the can body transported by the transport mechanism, and an outer periphery of the can body. A can inner surface coating film inspection device, comprising: a film thickness measuring device for measuring a coating film thickness on an inner surface of a can body by a second probe contacting the surface.