JPH07138890A - Production of hardly rotating wire rope - Google Patents

Abstract

PURPOSE:To provide a method for producing a hardly rotating wire rope, having a long rope pitch and capable of providing sufficient hardly rotating effects by preparing a strand having high straightness. CONSTITUTION:This method for producing a hardly rotating wire rope is to strand wires, prepare a strand (S) having a strand pitch of 5-6 times based on the strand diameter, pass the resultant strand in a meandering shape through plural rotatable rolls 11 in a roller device in which the rolls 11 are arranged zigzag and the roll diameter thereof is 3-4 times based on the strand diameter, take off the strand in one direction, carry out nonrepulsion treatment of the strand (S), then pass the strand (S) in a meandering shape through rolls 12 in a 4-roll type preforming device in which the interval of the respective rolls 12 is set at about 0.6 based on the pitch of the wire rope to be produced, take off the resultant strand in one direction, preform the strand and lay the 6 strands (S) thus treated. The rope pitch of the resultant hardly rotating wire rope is 8.0-8.5 times based on the rope diameter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-rotatable wire rope used as a hoisting rope of a high-lift mobile crane, for example.

[0002]

2. Description of the Related Art When tension is applied to a wire rope, a torque is generated in the rope so that the rope tends to rotate in a direction in which the rope returns. This torque acts to rotate the hoisting load when the rope is used as a hoisting rope in a mobile crane.

Therefore, as a hoisting rope of a mobile crane, a non-rotatable wire rope having a six-strand rope structure with a small torque is generally used. This non-rotatable wire rope has a structure in which the strand pitch is shorter and the rope pitch is longer than that of a normal 6-strand rope.

That is, in a normal 6-strand rope, the strand pitch is 7.8 times the strand diameter and the rope pitch is 6.0 to 6.5 times the rope diameter, but in the non-rotatable wire rope in which the torque is kept small, The strand pitch is 5 to 6 times the strand diameter, and the rope pitch is 7.0 to 7.5 times the rope diameter.

[0005]

By the way, when manufacturing a non-rotatable wire rope having a 6-strand rope structure, first, a plurality of strands are twisted together so that the strand pitch becomes 5 to 6 times the strand diameter. Produce strands. Then, six strands are combined to form a rope.

At the time of producing the strand, the non-repulsive working is performed to suppress the rotatability due to the repulsive force of the strand and to obtain a straight strand. For this repulsion processing, as shown in FIG. 4, a roller device in which a plurality of rotatable rolls 1 ... Is arranged in a zigzag manner is used, and a strand S is made to meander between the rolls 1 ... The strands S are tightened to impart straightness to the strand S.

Conventionally, the diameter of the roll 1 is
It is 5 to 6 times the diameter of the strand S, and the diameter of the roll groove is 1.5 to 2.0 times the diameter of the strand S. After the strand S has been subjected to the non-resilience process, the strand S is further shaped according to the pitch of the rope to be manufactured. As shown in FIG.
A three-roll type molding device in which two rotatable rolls 2 are arranged in a zigzag manner is used, and the interval width between the rolls 2 is about 0.8 times the pitch of the rope to be manufactured.

The strand S is meandered between the rolls 2, and the strand S is taken in one direction while applying a constant tension (back tension) to impart a meandering shape to the strand S. Then, the 6 strands S thus shaped are twisted together by a twisting device to manufacture a 6-strand rope.

Here, in order to sufficiently obtain the effect of difficult rotation, it is necessary to match short strand pitches with long rope pitches. However,
Conventionally, it is difficult to impart sufficient straightness to a strand when producing the strand and subjecting the strand to a non-resilience process, which becomes a constraint when twisting the strands to form a rope. The rope pitch length is limited to 7.0 to 7.5 times the rope diameter in production. However, if the rope pitch is about 7.0 to 7.5 times the rope diameter, it is difficult to expect a sufficient effect of difficult rotation.

The present invention has been made by paying attention to such a point, and an object thereof is to manufacture a strand having high straightness to obtain a long rope pitch and a sufficient effect of difficult rotation. It is an object of the present invention to provide a method for manufacturing a non-rotatable wire rope that can be manufactured.

[0011]

In order to achieve such an object, the present invention produces strands having strand pitches of 5 to 6 times the strand diameter by twisting strands, The rotatable rolls are arranged in a zigzag manner, and the roll diameter of the roll is 3 to 4 times the strand diameter. After that, this strand is passed in a meandering manner between the rolls in the molding device in which the interval width of each roll is set to approximately 0.6 times the pitch of the rope to be manufactured by the 4-roll method, and The strands were drawn in one direction, shaped and treated in this way 6
The strands of the book are twisted together to produce a non-rotating wire rope whose rope pitch is 8.0 to 8.5 times the rope diameter.

[0012]

When the strand of the roller device is passed in a meandering shape and is taken in one direction and subjected to the non-resilience process, the diameter of the roll of the roller device is set to 3 to 4 times the strand diameter. Therefore, even if the strand pitch is about 5 to 6 times as large as the strand diameter, it is possible to suppress the repulsion of the strands and to impart high straightness with low rotatability to the strand.

Even if the rope pitch is as long as 8.0 to 8.5 times the diameter of the rope, the strands thus imparted with high straightness are strongly shaped by a four-roll type shaping device and twisted together. It can be finished as a non-rotating wire rope with good tightness and excellent resilience. In this non-rotatable wire rope, the rope pitch is sufficiently long, so that excellent non-rotatability is obtained.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In the present invention, first, a plurality of strands are twisted together to manufacture a strand S having a strand pitch of 5 to 6 times the strand diameter.

FIG. 1 shows a roller device for subjecting the strand S to a non-resilience process. This roller device has a plurality of rotatable grooved rolls 11 ... It is arranged in a staggered pattern.

The strand S is passed in a meandering manner between the rolls 11 of the roller device, and is pulled in one direction while applying a constant tension (back tension) to subject the strand S to a non-repulsive process.

In the roller device, the diameter of the roll 11 is 3 to 4 times the diameter of the strand (conventionally, it is 5 to 5 times).
6 times) and the groove diameter d of the roll 11 is the same as the strand diameter as shown in FIG. 2 (conventionally 1.5 to 2 times the strand diameter).
Has become.

In such a roller device, even if the strand S has a strand pitch of about 5 to 6 times the diameter of the strand, it suppresses the repulsion of the strands and imparts to the strand S a high straightness with little rotatability. be able to.

Next, the strand S is imprinted using the imprinting device shown in FIG. The patterning device shown in FIG. 3 is configured in a four-roll system in which four rotatable rolls 12 ... Are arranged in a staggered manner. And each roll 12 ...
The interval width of the rope is 0.8 times the pitch of the rope to be manufactured in the past, but shorter than this,
It is about 0.6 times.

The strand S is passed in a meandering manner between the rolls 12 of the shaping device, and the strand S is drawn in one direction while applying a constant tension (back tension), and the strand S is shaped.

Then, the strands S thus produced are combined from six strands and the rope pitch is 8.0 to the rope diameter.
Manufactures non-rotating wire rope that is 8.5 times. The strand S is finished as a highly straight strand by the roller device, and therefore, sufficient shaping is imparted by the shaping device, so that when twisted as a rope, the rope pitch has a rope diameter of 8.0 mm. Finished as a non-rotating wire rope with good tightness and excellent resilience even at a pitch of ~ 8.5 times longer. And in this non-rotatable wire rope,
Since the rope pitch is long, sufficient rotation resistance can be obtained. Table 1 below shows the results of comparing the characteristics of the non-rotating wire rope according to the present invention and the conventional non-rotating wire rope.

[0022]

[Table 1]

As shown in this table, the hard-to-rotate wire rope according to the present invention has a torque coefficient smaller than that of the conventional hard-to-rotate rope by (13 to 15) × 10 ^−3. It can be seen that the effect of sex is definitely improving.

[0024]

As described above, according to the present invention, it is possible to obtain a non-rotating wire rope having a small torque coefficient and a high anti-rotating effect.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a roller device used in an embodiment of the present invention.

FIG. 2 is a front view of a roll of the roller device.

FIG. 3 is a configuration diagram of a molding device used in an embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional roller device.

FIG. 5 is a configuration diagram of a conventional patterning device.

[Explanation of symbols]

 11 ... Roller for Roller Device 12 ... Roll for Modeling Device S ... Strand

Claims (1)

[Claims] 1. A strand having a strand pitch of 5 to 6 times the strand diameter is produced by twisting strands, and a plurality of rotatable rolls are arranged in a zigzag manner, and the roll diameter is the strand. It is passed in a meandering manner between the rolls in a roller device having a diameter of 3 to 4 times, and it is pulled in one direction to subject the strands to a non-repulsive process. The interval width was serpentinely passed between the rolls in a shaping device set to about 0.6 times the pitch of the rope to be manufactured, and this was taken in one direction to form the strand, and the strand was processed in this way. The rope pitch is 8.0 to the rope diameter
A method for producing a non-rotating wire rope, comprising producing a non-rotating wire rope that is 8.5 times as large.