JPS6134414A - Thickness detector of rod shaped member - Google Patents

Abstract

PURPOSE:To detect the length of a diameter, by turning ON and OFF a pressure switch by the change in pressure in an air feeding pipe, in which the pressure is changed by the change in an annular area between a material to be detected and a detecting hole when the rod shaped material to be detected is inserted in the detecting hole. CONSTITUTION:In a detecting block 9, an air path 5a for guiding air from an air inlet port 5b to a detecting hole 5 is provided. An air feeding pipe 2 is connected to the air inlet port 5b. An air regulator 1 and a pressure switch 3 are provided at the intermediate parts of the pipe 2. The flow rate of the air is regulated by turning a regulating valve 1a. When the pressure in the pipe 2 exceeds a preset pressure, contact points in the pressure switch 3 are turned ON. The contact points in the pressure switch 3 are connected to a control box 10 and are operated as a sensor for the control box.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a detection device for detecting the thickness of a rod-shaped member.

(Prior Art) Conventionally, the support rod 4 (
As methods for detecting the thickness of the object to be detected (hereinafter referred to as the object 4), there are a method using a mito switch 7 as shown in FIG. 6, a method using a proximity switch 8 as shown in FIG. 7, and the like.

(Problem to be Solved by the Invention) However, in the detection method using the limit switch 7, for example, the detector 7a of the limit switch 7 directly contacts the detected object 4, so that the contact surface There were problems such as scratches and, if the paint was not applied, the paint would peel off.

In addition, for example, objects to be detected 4 whose radii differ only by 1 m
When detecting and sorting, there is a problem in that the limit switch 7 inevitably makes detection unstable.

On the other hand, when detecting and sorting the thickness of the detected object 4 using the proximity switch 8, there is a problem that, for example, if metal powder or the like is attached to the surface of the detected object 4, the thickness may be incorrectly detected. was there.

(Means for Solving the Problems) Therefore, in view of the above problems, the present invention includes a detection hole formed in a cylindrical shape with a predetermined diameter, and an air supply for supplying air to the detection hole. A device for detecting the thickness of a rod-shaped member is constructed from a pipe, an air regulator for keeping the flow rate of air supplied to the air supply pipe constant, and a pressure switch provided at a predetermined location on the air supply pipe. It is characterized by:

(Function) When a rod-shaped object to be detected is inserted into the detection hole,
The pressure switch is turned on and off by the pressure change inside the air supply vibrator, which changes as the annular area between the object to be detected and the detection hole changes.

(Example) Hereinafter, an example of the present invention will be specifically described with reference to the drawings.

In FIG. 1, reference numeral 9 indicates a detection block formed in the shape of a rectangular parallelepiped from metal, synthetic resin, or the like. A detection hole 5 formed in a cylindrical shape with a predetermined diameter is penetrated near the center of this block from the upper surface to the lower surface.

On the other hand, inside the detection block 9, an air passage 5a is provided for guiding air inserted from the air insertion port 5b to the detection hole 5 from both the left and right sides of the detection hole 5 in the drawing. This air passage 5a is formed in an annular shape, and its air introduction port 5C communicates with the detection hole 5 from the left direction of the detection hole 5 in the drawing, and the air introduction port 5d communicates with the detection hole 5 from the right direction of the detection hole 5 in the drawing. It communicates with Incidentally, a hen portion 5e formed in the shape of a dovetail is formed at the upper part of the detection hole 5.

Next, the air supply pipe 2 is connected to the air insertion port 5b. This air supply pipe 2 is connected to an air pump (not shown) or the like, and is configured to supply air from this air pump to the detection block 9.

On the other hand, in the middle of air supply pipe 2, there is air supply 1.
A regulator 1 and a pressure switch 3 are provided. The air regulator 1 maintains a constant flow rate of air sent from the air pump (not shown),
The flow rate of air can be adjusted by turning the adjustment valve 1a.

The pressure switch 3 is for detecting the pressure inside the air supply pipe 2, and in this example, when the pressure inside the air supply pipe 2 exceeds a predetermined pressure, the pressure switch 3 is activated. A contact provided inside is turned on.

The contacts inside this pressure switch 3 are connected to a control box 10, and function as a sensor for this control box 10.

The control box 10 controls a feeding device or a sorting device (not shown), and uses a detection signal from the pressure switch 3 to, for example, turn the drain plug 6 shown in FIG. Controls such as sorting or pasting labels based on differences in thickness are performed.

Next, the action and effect will be explained. First, air is supplied to the air supply pipe 2 from an air pump (not shown). This air is regulated to a predetermined flow rate by the air regulator 1 and then supplied to the detection block 9.

Next, the fourth thickness of the object to be detected is measured as follows. First, when nothing is inserted into the detection hole 5, the air supplied to the detection hole 5 via the air supply pipe 2 is directly released to the outside. For this reason, the pressure within the air supply vibrator 2 does not change at all, and therefore the pressure switch 3 does not operate.

Next, the object to be detected 4 for thickness measurement is inserted into the detection hole 5.
Insert against. At this time, when the thickness of the detected object 4 (the diameter of the detected object 4) is small, the gap between the outer circumferential surface of the detected object 4 and the inner circumferential surface of the detection hole 5 is large. The air supplied to the detection hole 5 is discharged to the outside through the gap wA with almost no resistance. Therefore, the pressure within the air supply pipe 2 does not increase, and therefore the pressure switch 3 does not operate.

Next, when the detected object 4 with a large diameter is inserted into the detection hole 5,
This time, the gap between the outer circumferential surface of the detected object 4 and the inner circumferential surface of the detection hole 5 becomes smaller, so that the air supplied from the air supply pipe 2 to the detection hole 5 flows between the detection hole 5 and the detected object 4. Because the FM gap between the Therefore, the pressure inside the air supply pipe 2 increases, and this pressure increase causes the pressure switch 3 to operate and turn on its contact. Therefore, the control box 10 detecting this assumes that the detected object 4 has a large diameter and performs a predetermined process, such as sorting (not shown), to support the device to sort the detected object 4.

In this manner, the thickness of the object to be detected 4 is detected in this example. Therefore, in this example, the thickness of the object to be detected 4 can be detected without making any contact with it.
Inconveniences such as scratches on the surface of the object to be detected 4 or peeling of paint do not occur. In addition, since the pressure switch 3 is configured to operate using air pressure, if the diameter of the detection hole 5 is set in advance with accuracy with respect to the diameter of the detected object 4, the diameter of the detected object 4 can be adjusted. It has the feature that even if the difference is 1 or less than 4, it can be selected with high accuracy.

In this example, the detection hole 5 is formed in a cylindrical shape, but it goes without saying that it may also be formed into a triangular prism shape, a quadrangular prism shape, etc., depending on the shape of the detected object 4. Further, although this example uses air for detection, if necessary, it is also possible to use other fluids.

(Effects of the Invention) As explained above, in the present invention, the diameter of the object to be detected is detected using air pressure. Unlike methods using limit switches, etc., there is no direct contact with the object to be detected, so there is no possibility of damaging the object.

Additionally, even if there is metal powder or dirt on the surface of the object to be detected, the air flowing out from the detection hole will blow it away, resulting in fewer malfunctions and false positives. .

Furthermore, since the structure is simple, the cost is low, and there are also favorable features such as fewer failures.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the overall configuration of the present invention, Fig. 2 is a sectional view taken along line A-A of the detection block shown in Fig. 1, and Fig. 3 is a detected object having a larger diameter than the detection block. FIG. 4 is an explanatory diagram showing a state in which an object is inserted. FIG. 4 is an explanatory diagram showing a state in which an object with a small diameter is inserted into the detection block. FIG. 5 is a perspective view showing a drain plug. 7 and 7 are explanatory diagrams showing a conventional example, and FIG. 8 is a B-B of the detection block shown in FIG. 1.
It is a sectional view taken along the B line. 1...Air regulator 2...Air supply pipe 3...Pressure switch 4...Detected object 5...Detection hole 5a...Air passage 5b...Air insertion ports 5c, 5d...・Air inlet 9... Detection block surface part 3! 1 Figure 4 Figure 6 Figure 7 Figure 511

Claims (1)

[Claims] A detection device for detecting the thickness of a rod-shaped member, comprising a detection hole formed in a cylindrical shape with a predetermined diameter, and an air supply pipe for supplying air to the detection hole. The thickness of the rod-shaped member is characterized in that it is composed of an air regulator for keeping the flow rate of air supplied to the air supply pipe constant, and a pressure switch provided at a predetermined location of the air supply pipe. Detection device.