JPS6246282A - Ultrasonic wave measuring instrument - Google Patents

Abstract

PURPOSE:To enable the measurement of the overall dimensions of an object to be measured, by sequentially transmitting and receiving ultrasonic waves to and from the object to be measured by ultrasonic wave transmitters and receivers, respectively, in a plurality of positions at equal spaces on the same circle around the circumference of the object and calculating a distance between the object and each transmitter and receiver. CONSTITUTION:Transmitted ultrasonic wave pulses generated in a transmitting circuit 14, the first ultrasonic wave pulse being emitted by a changeover circuit 13, are reflected from the surface of a cylindrical body X in the neighborhood of the intersection point A of the central axis of an ultrasonic wave transmitter and receiver 11a and the cylindrical body X and received by the transmitter and receiver 11a. Received signals are inputted to a receiving circuit 15 via the circuit 13 and a distance d1 between the transmitter and receiver 11a and the surface of the cylindrical body X is measured by an arithmetic circuit 20. Thus, the transmission and reception by the ultrasonic wave transmitters and receivers 11b-11f is sequentially changed over and distances d2-d6 are measured by the circuit 20. The approximate value of the whole circumferential length of the cylindrical body X can be obtained by calculating a given expression by the circuit 20.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an ultrasonic measuring device used for measuring the distance to an object to be measured, the shape of the object, and the like.

Conventional technology Conventionally, when molding a cylindrical body, which is a polyethylene bag,
As shown in Fig. 4, the cylindrical body X is discharged from the molding device l.
The diameter of the cylindrical body It is slightly controlled.

Problems to be Solved by the Invention However, the diameter of the cylindrical body X cannot be measured during the molding process using the molding apparatus 1 described above, and the circumference length has been measured after the molding is completed. For this reason, the circumferential length of the cylindrical body X becomes uneven due to variations in scenery, frame cutting speed, etc., and this variation in the circumferential length causes variation in the material thickness of the cylindrical body X. Therefore, it has been difficult to produce bags with uniform circumferential length and material thickness.

Therefore, the present invention is capable of measuring the distance to an object to be measured and the shape of the object using ultrasonic waves, and is particularly useful when molding a cylindrical body that is a polyethylene bag as described above. By measuring the circumference of the cylindrical body during the forming process, the measured value is fed back to the blower and winder to control the air volume and winding speed. The present invention aims to provide an ultrasonic measuring device useful for producing bags.

A means for solving the problem and a technical means of the present invention for solving the above-mentioned problem is to transmit and receive ultrasonic waves in the central direction at a plurality of equally spaced points on a concentric circle around the outer periphery of the object to be measured. An ultrasonic transducer that transmits waves, a transmitting circuit that applies transmission pulses to this ultrasonic transducer, a receiving circuit that processes the received signal from the ultrasonic transducer, and a It is equipped with arithmetic means for performing arithmetic operations.

action The effects of the above technical means are as follows.

That is, a transmission circuit applies a transmission pulse to the ultrasonic transducer, and the ultrasonic transducer transmits 1lfi-order ultrasonic waves to the object to be measured at multiple equally spaced locations on the same circumference. Ultrasonic waves reflected from an object are received by a receiving circuit, and based on the received signal of this receiving circuit, the distance from the ultrasonic transducer to the object to be measured can be measured by a calculation means. Can measure the outer diameter of objects.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, an ultrasonic measuring device according to a first embodiment of the present invention will be explained based on FIG. In FIG. 1, 11a
-11f are ultrasonic transducers, respectively, on the outer periphery of the cylindrical body
), are provided radially at equal angles (60 degrees), and each central axis is arranged in a direction passing through the center O of the circle 12. 14
15 is a transmission circuit that generates a transmission pulse to be applied to each ultrasonic transducer 511a-111, and 15 is each ultrasonic transducer 112.
The ultrasonic pulse transmitted from ~11f is reflected by the cylinder X, and is received by the ultrasonic transducer lia~11f.The receiving circuit performs signal processing such as amplification, detection, and smoothing of the received signal. Circuit 14 and receiving circuit 15! The i switching circuit 13 sequentially switches the ultrasonic transducers 11α to 11f. 16 is the receiving circuit 1.
5 is an amplitude comparison circuit that generates an output pulse when the output voltage is equal to or higher than the reference 11i pressure VT; 17 is a gate circuit that receives the transmission pulse generated in the transmission circuit 141V and the ultrasonic wave transmission/reception to which the transmission pulse is applied. The gate pulse is generated by the amplitude comparison circuit based on the received signal of the device, and the 16 output pulses. 18 is a reference frequency generation circuit that generates a reference pulse; one is a counter 19 whose operation is controlled by applying the gate pulse of the gate circuit 17; The number is counted by the counter 19 for a period determined by the gate pulse. 20 is an arithmetic circuit that calculates the count a of the reference pulses to the ultrasonic transducer 11 CL -1
] Based on the results of the distances @d1 to d6 between f and the cylindrical body X, the entire circumference of the cylindrical body X is calculated.

The operation of the above configuration will be described below. First, a first ultrasonic pulse is emitted from the transmission pulse generated by the transmission circuit 14 by the switching circuit 13 . The emitted ultrasonic pulse is sent to the ultrasonic transducer 11
4 is reflected from the surface of the cylindrical body X in the vicinity of the intersection A between the axis and the cylindrical body X, and the ultrasonic wave transducer 11fZ
The wave is received by

This received signal is input to the receiving circuit 15 through the switching circuit 13, and the distance d1 between the ultrasonic transducer 11α and the surface of the cylindrical body X is measured by the arithmetic circuit 20 as described above.

The value of distance d is temporarily stored in the arithmetic circuit 20. In this way, the switching circuit 13 sequentially switches between transmitting and receiving the ultrasonic transducers 11h to 11f, and the arithmetic circuit 20 measures the distances d2 to d6, and the values are stored in the arithmetic circuit 20. Ru.

Assuming that the intersection point between the central axis of each ultrasonic transducer 11α to 11f and the surface of the cylindrical body X is A-4, as shown in FIG.
When i (OA+OB) is the radius and the intersection of OA and OB with a circle centered on point O is NX R, the length of the outer edge AB of the cylindrical body X is approximately equal to the length of the circular arc NB', so , can be approximately determined using the following calculation formula (1).

1 □π−1 Σq■+0BXi−d(R−d, +R−d2)x−・
...(1) Similarly, the outer edge part BCXCD of the cylindrical body
・The length of FA is 2 <R' 2 + R-
d3) ×a 1-CR-d3+R-d4)XT...
, d(R-d, +R-d,)×i. Therefore, the total circumferential length e of the cylindrical body X is given by the sum of these, and can be approximated by the following calculation formula (2).

g22πR-y (d, +d2+...-d,)...
(2) Therefore, distance measurement data d, ~d6 by each ultrasonic transducer 11α to 11f and ultrasonic transducer 11
By calculating the above equation (2) in the arithmetic circuit 20 using the value of the radius R of the circle in which 12 to 11f are arranged,
The total circumference length of the cylindrical body X can be approximately determined.

Based on the data of the total circumference obtained from this, the amount of air blown by the blower 2 and the winding speed of the winder 5 shown in FIG. 4 are controlled during the molding process of the cylindrical body X. Therefore, the cylindrical body X having a uniform circumferential length and material thickness can be continuously manufactured.

In the first embodiment, the six ultrasonic transducers 11α to llf are arranged on the same circumference on the outer circumference of the cylinder X, but in order to improve the measurement accuracy of the cylinder X, It is sufficient to arrange more N ultrasonic transducers. In addition, the transmission and reception of each ultrasonic transducer 11α to 11f is performed by a switching circuit 1.
Although the switching is carried out by 3, each ultrasonic transducer may be individually provided with a transmitting circuit and a receiving circuit.

Next, the ultrasonic measuring device according to the second embodiment of the present invention is
This will be explained based on the diagram. In this embodiment, a ring-shaped track 31 with a radius R and a drive device 32 are arranged on the outer periphery of the cylindrical body X.
is provided, and one ultrasonic transducer 11 is scanned on a ring-shaped track 31 by a drive device 32.

Therefore, this embodiment has the same structure as the first embodiment, except that the switching circuit is not required.

The operation of the above configuration will be described below.

The ultrasonic transducer 11 transmits and receives ultrasonic waves at fixed timings, that is, at fixed interval positions on the orbit 31 while scanning the orbit 31 once, and calculates the distance between it and the cylindrical body X at each position. Measure. For example, on orbit 31, 6
Assuming that ultrasonic waves are transmitted and received at intervals of 0 degrees, the circumferential length of the cylindrical body X can be approximately determined from equation (2) in the same way as in the first embodiment. Therefore, according to this embodiment, the same effects as in the first embodiment can be obtained with one ultrasonic transducer 11.

Effects of the Invention As described above, according to the present invention, a transmission circuit applies a transmission pulse to an ultrasonic transducer to transmit and receive ultrasonic waves at a plurality of equally spaced locations on the same circumference on the outer periphery of an object to be measured. The ultrasonic transducer sequentially transmits ultrasonic waves to the object to be measured, the receiving circuit receives the ultrasonic waves reflected from the object to be measured, and based on this signal, the distance from the ultrasonic transducer to the object to be measured is calculated by a calculation means. It is also possible to measure the outer diameter of the object to be measured. Therefore, by using it especially when molding a cylindrical body, which is a polyethylene bag, an approximate value of the circumference of the cylindrical body is determined during the molding process, and this measured value is fed back to the blower or winder, and the It is possible to control the air volume and winding speed, and is useful for obtaining a cylindrical body with uniform circumference and thickness.

[Brief explanation of the drawing]

1 and 2 show an ultrasonic measuring device according to a first embodiment of the present invention. FIG. 4 is a general explanatory diagram showing the ultrasonic measuring device in the second embodiment, and a sectional view of a molding device for a cylindrical body which is a bag made of polyethylene. 11.11α~11f...Ultrasonic transducer, 13...
- Switching circuit, 14... Transmitting circuit, 15... Receiving circuit, 20... Arithmetic circuit. Name of agent: Patent attorney Toshio Nakao and one other person Figure 1 Figure 1112 Figure 3

Claims (5)

[Claims] (1) An ultrasonic transducer that transmits and receives ultrasonic waves toward the center at multiple equally spaced locations on a concentric circle around the outer periphery of the object to be measured, and a transmitter that applies transmission pulses to the ultrasonic transducer. An ultrasonic measuring device comprising: a circuit, a receiving circuit that processes a received signal from an ultrasonic transducer, and a calculation means that performs calculations based on the signal of the receiving circuit. (2) The ultrasonic measuring device according to claim 1, wherein a plurality of ultrasonic transducers are arranged concentrically. (3) Distance data between each ultrasonic transducer and the object to be measured sequentially measured by the calculation stage d_1, d_2...
d_N, and the radius of the circle where the ultrasonic transducer is placed is R
Then, the circumference length l of the object to be measured is expressed by the following formula l=2πR-(
π/N) (d_1+d_2+...+d_N) The ultrasonic measuring device according to claim 2. (4) The ultrasonic measuring device according to claim 1, wherein one ultrasonic transducer moves on a concentric circle. (5) While the ultrasonic transducer scans the circumference of the radius R once, it transmits and receives ultrasonic waves at regular intervals, and at each location, the distance to the object to be measured is measured by the calculation means, When these measurement data are d_1, d_2...d_N, the circumference length l of the object to be measured is calculated by the following formula l=2πR-(π/N
)(d_1+d_2...d_N).