JPH0351085B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a manufacturing apparatus for manufacturing a one-turn cut type wound core used in transformers and the like.

[Technical background of the invention and its problems]

The general structure of a one-turn cut type wound core is as shown in Fig. 1, in which a plurality of steel strips 1a, 1b, 1c...1n, each bent into a cylindrical shape with different diameters, are stacked radially inside and outside. So, each steel strip 1a,
Each cut 2a, 2b, 2c...2 of 1b, 1c...1n
In order to reduce loss by allowing the magnetic flux passing between them to pass through the steel strip of the adjacent layer, the position of n is sequentially changed in the circumferential direction for each winding, and returns to the original position again at an appropriate number of windings. It is becoming.

In order to manufacture this wound core, as shown in Fig. 2, a long steel strip 1 is wound up, a mark 3 indicating the cutting position is attached to the side surface of the steel strip 1, and while unwinding the steel strip 1, the part of the mark 3 is cut. Cut the steel strips 1a, 1b with a cutting blade,
There is a method of obtaining 1c...1n and overlapping the steel strips inside and outside in the original order. However, this manufacturing method has low productivity because most of the steps are performed manually.

Therefore, there is currently a need to develop manufacturing equipment that can automatically and continuously manufacture wound cores by automatically controlling the operations of winding the steel strip and cutting the steel strip with a cutting blade for each winding. has been done.

However, the thickness of the steel strip usually differs by several percent on both sides in the width direction, and when the steel strip is wound on the winding shaft in the above-mentioned wound core manufacturing device, it is wound flat due to the difference in the thickness. If the winding thickness increases, the steel strip to be wound may become twisted and shift toward the end of the winding shaft, making winding difficult. Therefore, in developing the above-mentioned wound core manufacturing apparatus, it is necessary to solve this problem.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and provides a wound core manufacturing apparatus that automatically winds and cuts a steel strip and prevents difficulties in winding due to deviations in the thickness of the steel strip. It provides:

[Summary of the invention]

The wound iron core manufacturing apparatus of the present invention presses the outer peripheral surface of the steel strip wound around the winding shaft with two winding belts, applies tension to the winding belts by a tension mechanism, and also presses the outer peripheral surface of the steel strip wound around the winding shaft. A detector detects displacement in the width direction of the belt, and a signal from the detector is used to apply tension to the winding belt on the side with a larger winding diameter of the steel strip wound around the winding shaft via a tension control device. It operates the mechanism.

[Embodiments of the invention]

An embodiment of the present invention illustrated in the drawings will be described below.

3 and 4 show an embodiment of the wound core manufacturing apparatus of the present invention, and FIG. 3 shows the entire apparatus,
FIG. 4 shows an enlarged view of the winding shaft and winding belt.

In the figure, 5 is a support that supports the steel strip 1 wound into a roll, and 6 and 6' are unwinding rollers 7 that unwind the steel strip 1 from the support 5, which rotate the unwinding roller 6 via a belt 8. 9 is an auxiliary roller, 1
0 and 10' are feed rollers that feed the steel strip 1 unwound from the support 5 by a predetermined length (reel winding length), and 11 is provided in front of the steel strip feeding direction with respect to the feed rollers 10 and 10'. A cutting blade 1 that cuts the steel strip 1 by being driven by a cylinder or the like (not shown);
Reference numeral 2 denotes a winding shaft which is provided in front of the cutting blade 11 in the steel strip feeding direction and winds the steel strip 1 sent by the feeding rollers 10 and 10' for each turn of the winding core, and the diameter of the winding shaft 12 is is equal to the diameter of the innermost periphery of the wound core.
In the figure, 13 is an electric motor that rotates the winding shaft 12 and the feed roller 9. The electric motor 13 rotates the winding shaft 12 via a belt 14, and also rotates the feed roller via a belt 15, a pulley 16, and a belt 17. For this reason, the winding shaft 12 and the feed roller 1
0 and 10' are rotated synchronously. 18A in the figure,
Reference numeral 18B indicates two sets of endless winding belts, and these winding belts 18A and 18B are rotatably supported by a plurality of guide rollers 19 and tension rollers 19', respectively, and are arranged in parallel.
The winding belts 18A and 18B are used to wind and hold down both sides of the outer peripheral surface of the steel strip 1 wound around the winding shaft 12, and run following the rotation of the steel strip 1 wound around the winding shaft 12. do. That is, one winding belt 18A presses one side of the outer peripheral surface of the steel strip 1 wound around the winding shaft 12, and the other winding belt 18B
presses the other side of the outer circumferential surface. In the figure, 20A and 20B are tension mechanisms, for example, two sets of cylinders using pneumatic pressure, and one cylinder 20A is used for the winding belt 1.
8A, the other cylinder 20B is the winding belt 1
Each corresponds to 8B. Cylinder 20A, 20
The respective piston rods 21, 21 of B are connected to couplings 22, 22 attached to tension rollers 19', 19' which individually support the winding belts 18A, 18B.
The piston rod 21,
By pulling the guide rollers 19', 19' in the direction of the arrow shown at 21, tension is applied to the winding belts 18A, 18B, respectively. By applying this tension, the winding belts 18A and 18B press down on the outer peripheral surface of the steel strip 1 wound around the winding shaft 12. cylinder 2
0A and 20B operate individually and the winding belt 18
The tensions of A and 18B, that is, the force that presses the outer peripheral surface of the steel strip 1, can be adjusted individually. In the figure, 23A and 23B are a pair of light emitters in a detector that detects the deviation in the width direction of the steel strip 1 wound by the winding shaft 12. They are provided on the outside of both side edges. That is, one light emitting device 23A is located on one side of the steel strip 1 corresponding to the winding belt 18A, and the other light emitting device 23B is located on the other side of the steel strip 1 corresponding to the winding belt 18B. It is located above a portion close to the side edge of 1. Detector emitter 2
The horizontal distance between 3A, 23B and the side edge of the steel strip 1 is about 1 mm in order to suppress the widthwise deviation of the steel strip 1 to a range that does not cause any practical problems. The detector is of a light reflection type, and when the light emitted from the light emitters 23A and 23B hits the object (steel strip 1), the receiver 24 receives the reflected light and detects the presence of the object (the position of the steel strip 1). This is to detect deviation). In the figure, 25 receives the signal from the receiver 24, and the light emitter 23A or 23
Cylinder 20A or 2 depending on the steel strip detection operation of B
A command is issued to the belt 3B to increase the tension of the winding belt 18A or 18B.

The operation of the wound core manufacturing apparatus configured as described above will be explained. First, the steel strip 1 supported by the support body 5 is pulled out and set so that its tip is in contact with the cutting blade 11, and the winding shaft 12 and the feed roller 10 are rotated by the electric motor 13. The steel strip 1 is fed by a rotating feed roller 10 and passed through a winding belt 18.
It is wound onto the winding shaft 12 which rotates while being held down by A and 18B. After the winding shaft 12 rotates once and winds up the steel strip 1, the motor 13 stops rotating, and the winding shaft 12 and the feed roller 10 stop rotating. Thereafter, the cutting blade 11 is operated to cut the steel strip 1. here,
The cutting length from the tip of the steel strip 1 to the point where it is cut by the cutting blade 11 is: L = Winding circumference of the steel strip 1 wound by one rotation of the winding shaft 1 + Between adjacent windings on the winding core The step amount of the cut is P+2tπ (t is the thickness of the steel strip). That is, as shown in FIGS. 1 and 5, cuts 2a and 2 of the steel strip 1 in the wound core are
Since b, 2c...2n shift in the circumferential direction sequentially for each winding, the length of the steel strip 1 is the sum of the circumferential length of one winding plus the length P + 2tπ to the cut position in the next winding. need to be cut. In other words, the winding shaft 1
2 rotates once and winds up the steel strip 1, the winding shaft 12
The length of the steel strip 1 from the point to the cutting blade 11 is P+2tπ. The amount of rotation of the winding shaft 12 for winding up the cut steel strip 1 corresponds to the cutting length of the steel strip 1. and,
When the steel strip 1 rotates once and stops, the circumference of the steel strip is measured by a length measuring device (not shown), and a calculation device that receives a signal from the length measuring device calculates the length of the steel strip to be wound next. The calculation is performed and the motor rotation amount is commanded to the control circuit of the electric motor 13, and the control circuit rotates the electric motor 13 at a predetermined rotation amount. The electric motor 13 includes a pulse generator, and the amount of rotation of the motor 13 is controlled by feeding back the amount of rotation of the motor by the pulse generator to a control circuit and comparing it with a reference amount of rotation in the control circuit. In this manner, the cutting length of the steel strip 1 is determined by controlling the amount of rotation of the winding shaft 12 for each winding of the wound core, and the steel strip 1 is sequentially wound and cut. Then, when the cut of the steel strip 1 reaches point B as shown in FIG. winding and cutting.

Next, a case will be described in which the occurrence of positional deviation during winding of the steel strip 1 due to the difference in thickness between the left and right sides of the steel strip 1 is prevented. Generally, for manufacturing reasons, the thicknesses t _{1 and} t ₂ of the steel strip 1 on both sides in the width direction differ by several percent, as shown in FIG. 8. That is, the plate thickness t ₂ of the other side of the steel strip 1 is larger than the plate thickness t ₁ of one side of the steel strip 1, and a deviation in plate thickness occurs between the two sides. When this steel strip 1 is wound around the winding shaft 12, as shown in FIG. 9, the winding diameter (thickness) D ₁ is smaller on the side edge side where the steel strip 1 is thinner, and the side where the thickness is larger. The winding diameter (thickness) _D2 on the side becomes larger, and the steel strip 1 is wound into a conical shape. Then, when the steel strip 1 is further wound in this conical state,
As shown in FIG. 10, the steel strip 1 is guided by the slope of the cone, twisted and moved along the width direction toward the side edge where the plate thickness is smaller, resulting in a positional shift S. As this positional deviation increases, the amount of twist of the steel strip 1 also increases, and as shown in FIG. Damaged by forcibly sliding against the provided guide 26,
Eventually, the steel strip 1 is bent by the guide 26 and cannot be wound.

Therefore, in the present invention, the steel strip 1 wound around the winding shaft 12 is wound in a conical shape, and when the steel strip 1 starts to shift in the width direction toward the side edge where the plate thickness is smaller, This is detected to prevent positional deviation. That is, when the steel strip 1 moves slightly along the width direction and one side edge with a smaller thickness slightly protrudes outward from the side edge of the already wound steel strip 1, the detector 23A or 23B The light beam emitted from the steel strip 1 is reflected by the side edge of the protruding steel strip 1, and the receiver 24 of the light emitter receives this reflected light, thereby detecting the positional shift of the steel strip 1. Detector light emitter 23A
Alternatively, the amount of positional deviation of the steel strip 1 detected by 23B (the amount of protrusion of the side edge of the steel strip 1) is approximately 1 mm, and within this amount of positional deviation, the feeding of the steel strip 1 and the function of the wound core will not be possible. This does not pose a practical problem. Then, the receiver 24 that receives the reflected light beam from the light emitter 23A or 23B outputs the detection signal to the arithmetic unit 25. The arithmetic unit 25 is the receiver 24
The winding of the steel strip 1 is adjusted in response to a signal from An operation command is given to each of the cylinders 20A and 20B so as to increase the tension of the winding belt on the side with a larger diameter and weaken the tension on the winding belt on the side with a smaller winding diameter. For example, as shown in FIG. 6, if the winding diameter of the side of the steel strip 1 on which the winding belt 18B is provided is small, the tension of the winding belt 18A is increased and the tension of the winding belt 18B is weakened. A command is given to the cylinders 20A and 20B as follows. By the way, the winding belts 18A and 18B are supported by a guide roller 19 and a tension roller 19', respectively, and are driven by the steel strip 1 while holding down both sides of the outer peripheral surface of the steel strip 1 wound around the winding shaft 12. Rotate. The winding belts 18A and 18B are connected to the cylinder 20
A tension roller 19' attached to the piston rod 21 of A, 20B applies tension evenly, and with this tension, both sides of the steel strip 1 are pressed down with an even force. Then, when the cylinder 20A corresponding to the winding belt 18A operates according to a command from the arithmetic unit 25 and the piston rod 21 is retracted, the tension roller 19' attached to the piston rod 21 is moved back and the winding belt 18A is moved back.
Pull A. Therefore, the tension of the winding belt 18A increases, and the force of the winding belt 18A to press down the side portion of the steel strip 1 having a larger winding diameter increases. In addition, according to a command from the calculation device 25, the winding belt 18B
When the cylinder 20B corresponding to the cylinder 20B operates to project the piston rod 21, the tension roller 19' attached to the piston rod 21 moves forward to loosen the tension on the winding belt 18B. Therefore, the tension of the winding belt 18B decreases, and the winding belt 18B decreases.
The force exerted by B to press down the side portion of the steel strip 1 where the winding diameter is small is weakened. In this way, the winding belt 18A strengthens the pressing force of the steel strip 1 wound on the winding shaft 12 on the outer circumferential surface of the side where the winding diameter is large, and the winding that presses down the outer circumferential surface of the side where the winding diameter is small is increased. Loosen the force on belt 18B.
Therefore, the steel strip 1 wound around the winding shaft 12 is prevented from moving in the width direction, and the winding shape of the steel strip 1 becomes uniform on both left and right sides as shown in FIG. Therefore, the steel strip 1 to be wound around the winding shaft 12 can be wound up satisfactorily without being misaligned.

〔Effect of the invention〕

As explained above, the wound core manufacturing apparatus of the present invention is capable of automatically winding and cutting a long steel strip, and is capable of winding the steel strip well without causing positional deviation during winding. A one-turn cut type wound core can be manufactured satisfactorily.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a wound core, FIG. 2 is an explanatory diagram showing a conventional method for manufacturing a wound core, FIG. 3 is a schematic configuration diagram showing an embodiment of the manufacturing apparatus of the present invention, and FIG.
The figure is a perspective view showing the winding belt of the same device and its tension adjustment device, Figure 5 is an explanatory diagram showing the cut position of the winding core, and Figures 6 and 7 are the positions of the steel strip to be wound around the winding shaft, respectively. FIG. 8 is a cross-sectional view showing a cross-sectional view of the steel strip, and FIGS. 9 to 11 are explanatory diagrams showing the positional shift of the steel strip. 1... Steel strip, 2... Cut, 5... Support, 6,
6'... Rewind roll, 10, 10'... Feed roller, 11... Cutting blade, 12... Winding shaft, 13... Electric motor, 18A, 18B... Rewind belt, 19...
...Guide roller, 19'...Tension roller,
20A, 20B... Cylinder, 21... Piston rod, 23A, 23B... Light emitter of detector, 2
4...Receiver, 25...Arithmetic device, 26...Guide.

Claims (1)

[Claims] 1. A winding shaft that is rotated by an electric motor and winds the steel strip,
a feed roller that sends the steel strip to the winding shaft; a cutting mechanism that cuts the steel strip wound around the winding shaft;
two sets of winding belts that rotate while holding down the outer circumferential surface of the steel strip wound around the winding shaft; two sets of tension mechanisms that individually apply tension to the two sets of winding belts; and the winding shaft. two sets of detectors are provided at both ends of the steel strip with a steel strip width interval therebetween, and detect the deviation in the width direction of the steel strip wound around the winding shaft; A wound iron core manufacturing apparatus comprising: a tension control device that operates a tension mechanism corresponding to the winding belt so as to increase the tension of the winding belt on the side where the winding thickness of the steel strip is larger; .