JPH0915073A - How to measure the tension of electric wires and cables while traveling - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a tension measuring method for continuously measuring electric wires and cables without bending or deforming them. [Structure] In a wire / cable manufacturing process consisting of a take-up machine 7 and a take-up machine 9, a take-up force is measured by connecting a load cell 5 fixed on the floor to a take-up machine installed on a slide rail 6, The take-up tension is measured by the dancer roll 8 provided between the take-up machine and the take-up machine, and the take-up force and the take-up tension are added electrically to measure the tension of the electric wire / cable just before the take-up machine. This is a method for measuring the tension of a running electric wire / cable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the tension of a wire / cable manufacturing process.

[0002]

2. Description of the Related Art FIG. 2 shows a schematic view of a conventional method for measuring the tension of a wire or cable. That is, the electric wire / cable 1 is bent and detected at three places by the two guide rolls 2 on both sides and the tension detecting roll 3 at the center. A load cell 4 is attached to the central detection roll 3 in order to measure its strain force. Generally, the tension of a running electric wire / cable is measured by a device configured as described above.

FIG. 3 is a vector diagram showing the relationship between the tension f of the electric wire / cable and the strain force F of the load cell in the method of FIG. Here, the angle θ is the guide roll 2
The angle formed between the tension detecting roll 3 and the tension detecting roll 3 forms an angle with the electric wire / cable 1 and the vertical strain direction applied to the tension detecting roll 3 there. As can be seen from this vector diagram, the tension f of the electric wire / cable can be easily obtained from the relational expression of f = F / 2 · cos θ.

As described above, in the process of manufacturing electric wires / cables, when measuring the tension of the electric wires / cables during running, the electric wires / cables must be bent by a pulley or the like. Therefore, when the electric wire / cable is running in a straight line, it must be bent at at least three places.

[0005]

In order to measure the tension of the electric wire / cable during traveling, the electric wire / cable must be bent by using the pulley or the like as described above. Although the above-mentioned tension measuring method has been widely used with good accuracy, some electric wires and cables are extremely reluctant to bend or have a large minimum bending radius. In the case of manufacturing an electric wire / cable having such a large allowable bending radius, in order to apply the conventional tension measuring method, the measuring device becomes too large and the installation space thereof becomes large.

As described above, there has been a strong demand for a means for measuring the tension of a running electric wire or cable without bending it. The present invention has been made in view of such a point, and a novel measuring method for continuously measuring the tension of a running electric wire / cable without particularly bending or deforming the electric wire / cable is provided. The purpose is to provide. Another object of the present invention is to provide a simple and inexpensive tension measuring device without using a particularly large and expensive means.

[0007]

The present invention relates to a pulling force by connecting a load cell fixed on a floor to a pulling machine installed on a slide rail in a process of manufacturing an electric wire / cable consisting of a pulling machine and a winding machine. On the other hand, the take-up tension is measured by a dancer roll provided between the take-up machine and the take-up machine. It is a method for measuring the tension of a running electric wire / cable, characterized in that the tension of the cable is measured.

[0008]

[Operation] Just attach the load cell to the take-up machine installed on the slide rail, measure the moving force of the electric wire / cable of the take-up machine in the running direction, and add the take-up tension measured by the dancer roll to this. It is possible to measure the tension of the electric wire / cable running in a straight line in front of the take-up machine with extremely high accuracy.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for measuring tension of a running electric wire / cable according to the present invention will be described below with reference to the drawings. FIG.
[Fig. 3] is a schematic diagram for explaining a method of measuring the tension of an electric wire / cable during traveling. That is, the electric wire / cable 1 sent from the extruder (not shown) on the left side to the right side is fed from the take-up machine 7 driven by the take-up machine drive motor 10 driven by the command from the motor control device 13, and from the motor control device 15. It is configured to be pulled by two devices of the winder 9 driven by a winder drive motor 12 driven by a command, and wound around a winding drum 9a of the winder 9. It should be noted that the motor control devices 13 and 15 respectively include the speed setting device 16
And controls the drive motors 10 and 12 so that their speeds are constant.

The take-up machine 7 is installed on the slide rail 6 which has very little friction with the floor surface. The take-up machine 7 can freely move in the traveling direction of the electric wire / cable 1. A load cell 5 fixed to the floor is connected to the take-up machine 7, and the force of the electric wire / cable 1 in the traveling direction receives a strain force proportional to the pulling force of the take-up machine 7 and is measured. To be done.

Next, for measuring the winding tension, a dancer roll 8 having a dancer displacement detector 11 for detecting the displacement of the electric wire / cable 1 is installed between the take-up machine 7 and the take-up machine 9. The position of the dancer roll 8 becomes a constant position with zero steady-state deviation by forming a speed control loop in the electric wire / cable 1 as shown in FIG. This dancer roll 8 is a group roller 8 that contacts the electric wire / cable 1.
a or a pulley having a large radius, the weight of the cluster roller 8a is detected by the displacement detection device 14 connected to the dancer displacement detector 11, and the tension of the electric wire / cable 1 between the take-up machine 7 and the winder 9 is detected. Decide. That is, if the weight and the position of the dancer roll crowding roller 8a are constant, the winding tension of the electric wire / cable 1 is equal to the crowding roller 8a.
It will be determined by the weight of a. Regarding the winding point, the electric wire / cable 1 is guided so that the position of the dancer roll 8 is fixed. The electric signal from the displacement detection device 14 is input to the motor control device 15 and added to the signal from the speed setting device 16 to change the speed of the winding drive motor 12.

The tension of the electric wire / cable is obtained by adding the take-up force of the take-up machine 7 by the load cell 5 and the take-up tension of the take-up machine 9 by the dancer roll 8 to obtain the electric wire / cable 1 immediately before the take-up machine 7. It is possible to easily calculate the tension in the linear state. That is, the feature of the present invention is that the pulling machine 7 is attached to the slide rail 6 and the pulling force is monitored by the load cell 5. Usually,
Since the winding tension of the winder 9 is so small that it cannot be ignored with respect to the pulling force of the winder 7, it is often not considered. However, strictly speaking, it must be taken into consideration unless the winding tension becomes zero.

Since the winding tension of the electric wire / cable varies depending on the winding position, the weight is detected by the weight of the cluster roller 8a of the dancer roll 8 in the example shown in FIG. However, it is also conceivable that most of the winding tension is zero after the wire / cable is pulled by the winder 7, or the winding tension may be constant. For example, in the case of packing or storing in a pan, in this case, since only the weight of the electric wire / cable needs to be considered, it can be processed as a constant.

In the above example, the number of the load cells 5 provided in the take-up machine 7 is one. However, a plurality of load cells may be used, and in this case, the values of the plurality of load cells are converted into electric values. Can be processed easily and synthesized easily.

[0015]

As described above, according to the method for measuring the tension of a running electric wire / cable of the present invention, it is possible to continuously measure the tension without bending the running electric wire / cable. In addition to the advantages in terms of cost and cost, the wire / cable can be manufactured with good quality without applying bending force to the wire / cable.

[Brief description of the drawings]

FIG. 1 is an explanatory view for explaining a method for measuring tension of a running electric wire / cable according to an embodiment,

FIG. 2 is a configuration diagram for explaining a conventional tension measuring method,

3 is a vector diagram of the tension of FIG. [Explanation of symbols] 1 wire / cable 2 guide roll 3 tension detection roll 4 load cell 5 load cell 6 slide rail 7 take-up machine 8 dancer roll 9 winder 10 take-up machine drive motor 11 dancer displacement detector 12 winder drive motor 13 , 15 Motor control device 14 Displacement detection device 16 Speed setting device

Front Page Continuation (72) Inventor Shinichi Yoshida 5-1-1 Hidaka-cho, Hitachi City, Ibaraki “Hitachi Cable Co., Ltd. Hidaka Factory”

Claims (1)

[Claims] 1. In a process of manufacturing an electric wire / cable consisting of a take-up machine and a take-up machine, a take-up machine installed on a slide rail is connected to a load cell fixed on the floor to measure take-up force. The take-up tension is measured by a dancer roll provided between the take-up machine and the take-up machine, and the take-up force and take-up tension are added electrically to measure the tension of the wire / cable just before the take-up machine. A method of measuring the tension of a running electric wire / cable, characterized in that