JPH0450482Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for inspecting the inner dimensions of a hollow extruded product, particularly a plastic tubular body having a closed hollow cross-sectional shape.

[Conventional technology and its problems]

Conventionally, the internal dimensions of a running tubular body having a closed hollow cross-sectional shape have not been inspected because there is no means for supporting the testing tool from the outside of the tubular body.

The present invention solves the above problems by magnetically holding a passing gauge of a predetermined standard size inside the hollow section of a running tubular body, and preventing the gauge from moving in the traveling direction together with the tubular body. It is an object of the present invention to provide an internal dimension inspection device for a hollow extrusion molded product that detects internal dimension abnormalities.

[Means for solving the problem] The present invention consists of a short magnetic metal passage gauge inserted into a closed hollow cross-sectional plastic tubular body during running after extrusion molding, and a magnetic holder that surrounds the tubular body and holds the passage gauge at a predetermined position of the traveling tubular body by magnetic force; and a magnetic sensor that detects movement of the passage gauge together with the tubular body. It is equipped with the following.

[Effect]

When the metal passage gauge, which is inserted into the hollow cross section of the moving tubular body and held at a predetermined position inside the tubular body by magnetic force, encounters a narrowed part of the hollow cross section due to an abnormality in internal dimensions, It moves by being pushed in the direction of travel, and the movement is detected by a magnetic sensor installed at a predetermined position on the travel side.

〔Example〕

Embodiments of the present invention will be explained in detail based on the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a plastic tubular body continuously fed out from an extrusion molding machine (not shown), and has a closed hollow cross-sectional shape. 2
is a magnet holder having a generally cylindrical shape as a whole, and the coil 4 is wound around a magnetic material 3 having high magnetic permeability, and is provided so as to surround the tubular body 1 after being extruded and cooled. Reference numeral 5 denotes a passage gauge made of a magnetic metal material, which is disposed inside N of the tubular body 1 and approximately at the axial center position of the magnetic holder 2, and is held therein. A magnetic sensor 6 is provided at a suitable distance from the magnetic holder 2 in the traveling direction to notify the approach of the passage gauge 5.

A cutting machine (not shown) is provided further in the traveling direction of the magnetic sensor 6, and the tubular body 1 is continuously cut into predetermined lengths by the cutting machine.

Therefore, the cross-sectional shape of the passage gauge 5 is as shown in FIGS. 3 and 4.
With reference to the part to be inspected at 0, the passage gauge 5 is formed in substantially the same shape or slightly smaller than the part to be inspected, and it is sufficient that the length of the passage gauge 5 is equal to or slightly longer than the width. In the illustrated embodiment, the tubular body 1 has a shape suitable for accommodating a large number of electronic components 7 such as integrated circuit devices, and a rectangular parallelepiped mold for the electronic components 7 is provided in the center C of the hollow cross section 10. A plurality of pairs of downwardly bent lead wires 9 protruding left and right from the molded portion 8 are housed in both side portions S, S of the portion 8. especially,
The shoulders 23, 23 of the mold part 8 are the left and right side walls 1.
It abuts against the upper bent portions of 7 and 17.

Therefore, in order to reliably store the electronic components 7 in a stable posture and to prevent damage to the electronic circuit built into the mold section 8, it is necessary to ensure that the mold section 8 is located at the central portion C of the hollow cross section 10. For this purpose, the cross-sectional shape of the central portion C at any position in the length direction of the tubular body 1 must remain unchanged with respect to a predetermined reference cross-sectional shape.

Therefore, the cross-sectional shape of the passage gauge 5 is formed in such a standard cross-sectional shape, and the relevant portion inside the tubular body 1 while the gauge 5 is running,
By arranging the magnet holder 2 in an encircling manner, as shown in FIG. If there is an abnormal inner dimension E such as a narrowed part due to distortion of the entire cross-sectional shape of the section C, the passage gauge 5 will be caught in this abnormal inner dimension E and move toward the traveling direction side. transported.

Thus, the passage gauge 5 is detected by a magnetic sensor 6 placed at a predetermined distance from the holder 2.

FIG. 5 shows a specific example of a circuit for obtaining a direct current flowing through the coil 4 of the holder 2, 13 is a transformer, 14 is a variable transformer, 15 is a rectifier, and specifically, the AC voltage applied to the rectifier 15 is is adjusted within the range of 0 to 50V, and the resulting DC voltage is then applied to the coil 4. The magnetic force generated by the holder 2 is controlled by adjusting the current flowing through the coil 4.

Next, in FIG. 6, when the magnetic sensor 6 detects that the passing gauge 5 approaches, the detection output operates the relay 16, and as the relay 16 operates, a self-holding circuit is formed. , Dimensioning solenoid circuit 1 in the above cutting machine
8. The clamp cutting solenoid circuits 19 are opened, and the sizing and clamp cutting operations are stopped. When the relay 16 operates as described above, the abnormality occurrence notification light 20 lights up.

After the operator completes the prescribed measures such as cutting and removing the abnormal internal dimension E of the tubular body 1 and confirms that the original normal state has been restored, the operator turns the control switch 21 on.
Normal operation cannot be performed until the self-holding of the relay 16 is released. Note that until the limit switch 22 attached to a predetermined position is activated, the cutting bed (not shown) that is transporting the tubular body 1
It is possible to keep it moving.

Regarding the shape of the hollow cross section 10 of the tubular body 1, in addition to the above embodiments, for example, a substantially inverted U shape as shown in FIG.
The cross-sectional shape of the passage gauge 5 in this case is exemplified as an equilateral trapezoid.

FIG. 8 shows that the overall shape of the hollow cross section 10 is approximately H-shaped, and the shoulder portion 2 of the mold portion 8 of the electronic component 7 is
Regulating ribs 24 and 24 that hold 3 and 23 protrude from the inner surface of the upper wall portion 11. The passage gauge 5 is connected to the regulating ribs 24, 24 and the left and right side walls 17, 1.
The cross-sectional shape is used to inspect the spacing between 7.

FIG. 9 shows the shape of a hollow cross section 10 for housing an electronic component 7 having lead wires 9 only on one side of the molded part 8. Wall part 11 and bottom wall part 1
2, etc. are inspected. Further, if the upper and lower regulating ribs 24, 24 are touching each other, this will be immediately discovered.

FIG. 10 shows a case where regulating ribs 24, 24 having the same effect as described above are provided on the inner surface of the upper wall portion 11, and the entire hollow cross section 10 is approximately U-shaped.

The one shown in FIG. 11 has almost the same overall shape as the hollow cross section 10 in FIG. ing.

As the shape of the hollow cross section 10 of the tubular body 1, the shape of the 12th
The one shown in the figure may be used, and the inner dimensions can be inspected using the passage gauge 5.

As mentioned above, if there is a defective product with an abnormal internal dimension in the hollow section 10 of the tubular body 1, the passage gauge 5 moves and the magnetic sensor 6 immediately detects it and issues a signal to operate the relay 16. Since the cutting operation of the tubular body 1 is automatically stopped instantaneously and an alarm is issued at the same time, each worker can also deal with the situation.

Regarding the material that can be used for the tubular body 1, it is desirable to use semiconductive plastics that have excellent antistatic properties in order to prevent damage to the circuits built into the electronic components 7, but conductive plastics also have antistatic properties. Fully applicable.

[Effect of idea]

In this way, in the present invention, a short magnetic metal passage gauge 5 is inserted into the interior N of a moving plastic tubular body 1 having a closed hollow cross section, and a predetermined position in the hollow cross section 10 is detected by magnetic force. By holding the tubular body 1 in position, if there is a defect in the tubular body 1, such as an insufficient internal dimension, it will be detected by the magnetic sensor 6 and can be immediately discovered. Furthermore, it is possible to immediately stop the device for cutting the tubular body 1 by the signal from the magnetic sensor 6, and it is possible to continuously inspect the internal dimensions of the entire lengthwise cross section of the tubular body 1, thereby making it possible to inspect the finished product. This has the effect of allowing 100% inspection to be carried out easily and quickly.

Furthermore, by adjusting the magnetic force by adjusting the current flowing through the coil 4 of the magnetic holder 2, the force for holding the passage gauge 5 in a stationary state at a predetermined position of the traveling tubular body 1 can be strengthened, and therefore, , can be applied to any traveling speed of the tubular body 1.

As described above, the present invention does not require any external support and can easily and continuously inspect the internal dimensions at the same speed as the tubular body 1 during extrusion molding, so it is highly versatile and practical. The value is extremely high.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a perspective view showing a state where the passage gauge has been transported close to the magnetic sensor due to an internal dimension abnormality in the tubular body 1, and Figure 3 is a perspective view showing the passage gauge being inserted into the inside of the tubular body. , Fig. 4 is a cross-sectional view of the tubular body, Fig. 5 is a circuit diagram for passing a predetermined current through the coil of the magnetic holder, and Fig. 6 is a circuit having a magnetic sensor, etc. for detecting movement of the passage gauge. 7 to 11 are perspective views showing other specific examples of the hollow cross section of the tubular body and the passage gauge, and FIG. 12 is a cross sectional view showing still another specific example of the hollow cross section. . 1... Tubular body, 2... Magnetic holder, 5...
...Passing gauge, 6...Magnetic sensor, N...Inside of tubular body.

Claims (1)

[Scope of utility model registration request] A short magnetic metal passage gauge 5 is inserted into the inside N of the plastic tubular body 1 having a closed hollow cross section while it is running after extrusion molding, and is provided to surround the running tubular body 1. It includes a magnetic holder 2 that holds the passage gauge 5 at a predetermined position on the traveling tubular body 1 by magnetic force, and a magnetic sensor 6 that detects when the passage gauge 5 moves together with the tubular body 1. An internal dimension inspection device for hollow extrusion molded products.