JPH0473820A - Superconducting wire forming stranding maching - Google Patents

Abstract

PURPOSE:To effectively obtain a mold strand of good quality that does not cause defective strand such as cross by installing a brake for applying a reverse rotational torque on a bobbin for superconducting wire supply. CONSTITUTION:A toothed gear 5 is mounted on one bobbin shaft 3 protruded from a bobbin supporting frame 4, while this toothed gear 5 is linked with a torque motor 7 through a chain 6. A preset rotational power reverse to the rotational direction of a bobbin 1 is of charged to the torque motor 7, and when a superconducting wire 2 wound around the bobbin 1 is irregularly wounded and the rotation of the bobbin 1 is stopped, the torque motor 7 is actuated immediately, and the bobbin 1 is rotated in a reverse direction, and the loosening of the superconducting wire 2 is thus removed. The formed strand thus obtained is of good quality without crossed part and the like.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention constantly applies a predetermined tension to superconducting wires before twisting, thereby producing high-quality superconducting wire-formed stranded wires without defects such as cross portions. The present invention relates to a superconducting wire forming/twisting machine obtained.

[Conventional technology and its issues]

As shown in FIG. 2, the superconducting wire forming/twisting machine includes a plurality of bobbins 1 on which superconducting wires 2 are wound, each of which is rotatably attached to a bobbin support frame 4 via a rolling bearing. The superconducting wire 2 is supplied from the bobbin 1 while being rotated around the stranding axis, and the superconducting wire 2 is twisted through two battens 8 which rotate at the same rotational speed as the support frame 4, and then the superconducting wire 2 is twisted together for forming. This is an apparatus for manufacturing a superconducting wire-formed stranded wire by forming the stranded wire into a predetermined shape using rolls 9.

The bobbin of the above-mentioned wire twisting machine rotates as the superconducting wire wound around the bobbin is pulled out by a forming roll, and this bobbin is equipped with a brake to brake the rotation of the bobbin. Conventionally, this brake is a powder brake in which the bobbin shaft is braked by an electromagnet or a permanent magnet, or a wheel is attached to the bobbin shaft, a cloth or leather hand is hung on the wheel, and one end of the hand is attached to the powder brake. To attach the bar 1, a band brake, etc., which applied tension to perform braking, was mainly used.

However, all of the conventional brakes mentioned above only have the effect of braking the forward rotation of the bobbin, so if the superconducting wire becomes loose due to disordered winding of the superconducting wire within the bobbin, the bobbin will stop rotating. Therefore, the superconducting wires supplied from this bobbin are twisted together loosely,
As a result, the resulting formed stranded wire has a loss portion as shown in Figure 3, and this cross portion is compressed by the forming rolls and deforms into a constriction, resulting in a reduction in superconducting properties or wire breakage. was there.

1. Means for Solving the Problem] The present invention was made as a result of intensive research in view of the above situation, and its purpose is to provide a superconducting wire that can produce a high-quality formed stranded wire without cross portions, etc. Our purpose is to provide a forming and twisting machine.

That is, the present invention is a superconducting wire forming/twisting machine for twisting and forming superconducting wires supplied from a plurality of bobbins into a desired shape, which is characterized in that the bobbins are equipped with a brake that applies reverse rotation torque. be.

The superconducting wire forming and twisting machine of the present invention is equipped with a brake that applies reverse rotation torque to the superconducting wire supply bobbin. When the extra length is paid out, the bobbin is rotated in the opposite direction by the action of a brake, so that any slack in the supplied superconducting wire is immediately removed.

Below, the bobbin portion equipped with a brake of the wire twisting machine of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the bobbin portion used in the wire twisting machine of the present invention. In the figure, 1 is a bobbin, and 7 is a torque motor.

A superconducting m2 is wound on a bobbin 1, and the bobbin 1
A shaft 3 is rotatably attached to a bobbin support frame 4 via a rolling bearing, a gear 5 is attached to one bobbin shaft 3 protruding from the bobbin support frame 4, and this gear 5 is connected via a chain 6. It is connected to a torque motor 7.

The torque motor 7 is loaded with a predetermined rotational force in the opposite direction to the rotational direction of the bobbin 1, and when the superconducting wire 2 wound around the bobbin 1 is disturbed and the rotation of the bobbin 1 stops, immediately The torque motor 7 is activated, the bobbin 1 is rotated in the opposite direction, and the slack in the superconducting wire 2 is removed.

In the present invention, the brake that is installed on the bobbin and applies a reverse rotational torque is not limited to the above-mentioned torque motor, but any brake that can apply a reverse rotational force to the bobbin can be used.

[Effect]

In the superconducting wire forming/twisting machine of the present invention, the superconducting wire supplying bobbin is equipped with a brake that applies reverse rotation torque, so that the superconducting wire in the bobbin is not wound properly and the supplied superconducting wire becomes loose. Even when the wire is stranded, the bobbin rotates in the opposite direction and the superconducting wire is rewound, tension is immediately applied to the superconducting wire, and the resulting formed stranded wire is of good quality without cross sections.

[Example] The present invention will be explained in detail below using examples.

Example 1 7000 Nb-Ti filaments in copper matrix
*The composite superconducting wire of 0.68 mmφ is wound onto a bobbin equipped with the same torque motor type brake as shown in Fig. 1, and this bobbin is used as the same superconducting wire forming stranded wire as shown in Fig. 2. A 30-strand rectangular shaped stranded wire with cross-sectional dimensions of 1.17mm x 9.72++m was manufactured by attaching it to the support frame of the machine.

Comparative Example I A rectangular shaped stranded wire was produced in the same manner as in Example 1, except that a bobbin equipped with a powder brake or a hand brake was used.

Following each rectangular shaped stranded wire thus obtained,
The number of cross sections in the formed stranded wire, and the critical current (I,) of the section including the cross section and the sound section were measured under the conditions of 4.2 K and a magnetic field strength of 5 Tesla. The results are shown in Table 1.

As is clear from Table 1, the rectangular shaped twisted product was manufactured using the bobbin of the present invention! (Nnl) has no cross part,
It was of good quality.

In contrast, those manufactured using conventional bobbins (Nct
2.3), many cross portions were observed.

Also, Ic of the part including the cross part is 180A and 2 of the healthy part.
This was significantly lower than that of 2OA.

Among the comparative examples, floor 3 used a band brake for bobbin braking, so there was a time lag in braking, and the number of cross sections was greater than floor 2, which used a powder brake.

The bobbin equipped with a brake that applies reverse rotation torque using a torque motor has been described above, but any brake that can apply reverse rotation torque can be used as the brake that is installed on the bobbin of the present invention.

〔effect〕

As described above, according to the present invention, it is possible to efficiently produce a molded stranded wire of good quality that does not cause twisting defects such as cross, and has a significant industrial effect.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of the bobbin device of the wire twisting machine of the present invention, Fig. 2 is an explanatory diagram of the ultra-IF conductive wire forming/twisting machine, and Fig. 3 is an explanatory view of crossing defects in the forming stranded wire. . ■...Bobbin, 2...Superconducting wire, 3...Bobbin shaft, 4...Bobbin support frame, 5...Gear, 6...
...Chain, 7...Torque motor 8...
- Grain board, 9... Roll for forming.

Claims (1)

[Claims] A superconducting wire forming/twisting machine for twisting and forming superconducting wires supplied from a plurality of bobbins into a desired shape, the superconducting wire forming/twisting machine being equipped with a brake that applies reverse rotational torque to the bobbins.