JPH0197285A - Treatment of terminal of rope like article - Google Patents

Abstract

PURPOSE: To treat the terminal portion of a rope-like article produced from fibers having a high elastic modulus, or the like, in a short processing time at a low processing cost and in high reliability by inserting the terminal portion of the rope-like article covered with a resin layer into a metal pipe piece and subsequently pressing the metal pipe piece to tightly fasten the terminal portion. CONSTITUTION: This method for treating the terminal portion of a rope-like article comprises covering a rope-like article 1 formed from fibers having a tensile strength of >=15 g/d and an initial tensile resistance of >=400 g/d with a resin layer 2, inserting the terminal portion of the rope-like article 1 covered with the resin layer 2 into a metal pipe piece 3, and subsequently pressing the metal pipe piece 3 to tightly fasten the rope-like article 1 to the pipe piece 3.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for terminal treatment of a rope-like article formed from high strength, high modulus fibers such as aromatic polyamide fibers and high strength polyethylene fibers. .

[Prior Art] When a rope, cord, etc. is used for any purpose, it is usually necessary to perform terminal treatment by providing a knot, metal fitting, etc. at one or both ends of the rope for fastening to other structures.

In the case of steel wire rope, there are four methods: folding the end of the rope and braiding it back into the original rope (so-called ice splicing), using metal fittings such as a cotter socket, fastening using several clips, and using aluminum alloy pipes. A method of plastically deforming the wire rope at room temperature and attaching it to the wire rope.
and so on.

Conventional methods for treating the ends of fiber ropes include tying a knot for small diameter ropes, and tying or eye splicing for large diameter ropes. The use of kotsuta, sockets, and wire clips as in the case of wire ropes is not recommended because these end-treatment tools are made of metal and easily damage the rope, and are also expensive. There were few.

The method of plastically deforming aluminum alloy pipes to bring them into close contact could not be used because the fiber rope would collapse during the plastic deformation of the pipes, making it difficult to maintain the strength of the rope. In addition, even if the fiber rope can be brought into close contact with the aluminum alloy pipe to prevent it from being crushed during plastic deformation, the rope will elongate significantly when a tensile force is applied to the rope, resulting in a decrease in the rope diameter of the aluminum alloy pipe. There was also the problem that slipping between the aluminum alloy pipe and the rope could not be prevented.

Para-aromatic polyamide fibers and high-strength polyethylene fibers, which have recently been used for ropes, have high tensile strength, high initial tensile resistance, and low elongation, so they have low knot strength. The ratio of strength to linear strength of hooks is lower than that of conventional fibers, and even if it is a small-diameter rope, tying it is not preferable because it reduces the strength of the rope.

Furthermore, even if a special knot is used to make full use of the strength of the rope, there are problems such as the knot being too large. The ice splice process is strong and can be fully utilized, and the shape of the splice is compact, which is preferable.
It is difficult to splice ropes other than those with a three-strand structure, and it is difficult to remove the resin coating from resin-coated ropes.
There were problems such as: Furthermore, fibers with high tensile strength make the rope diameter small and the initial tensile resistance is high, making splicing difficult.

[Problems to be Solved by the Invention] An object of the present invention is to provide a method for treating the ends of a fiber rope that is compact, has a high strength retention rate, and is inexpensive in processing cost.

[Means for Solving the Problems] The object of the present invention described above is to have a tensile strength of 15 g/d or more,
After coating a rope-like object made of fibers with an initial tensile resistance of 400 g/d or more with a resin layer, the end of the rope-like object coated with this resin layer is inserted into a metal pipe piece, and then the metal This can be achieved by a method for treating the end of a rope-like article, which is characterized by pressing the pipe piece to bring the pipe piece and the rope-like article into close contact and fastening them.

FIG. 1 shows a cross-sectional view of a preferred example of an end treatment section to which the method of end treatment of a rope-like object according to the present invention is applied.

In FIG. 1, reference numeral 1 indicates a rope-like object formed of fibers, and the fibers forming this rope-like object must have a tensile strength of 15 SF/d or more and an initial tensile resistance of 400 g/d or more. When the tensile strength is less than 15 g/d, the fibers are likely to be cut at the edges of the metal pipe piece, and there is a problem that it is difficult to plastically deform the metal pipe piece without cutting the fibers. If the initial tensile resistance is less than 4009/d, there is a problem that when tension is applied to the rope in the end treatment part, the rope-like object in the end treatment part is greatly deformed, easily coming off or breaking the resin layer. be.

Examples of fibers that satisfy such tensile strength and initial tensile resistance values include para-aromatic polyamide fibers, aromatic polyester fibers, and high-strength polyethylene fibers.

There is no particular limitation on the structure of the rope-like object 1 formed from the fibers, and it may be a straight line, a braid, etc., or a composite rope, a rope, or a belt made of two or more types of fibers, steel wire, copper wire, etc. It is also possible to have a non-circular cross section. In composite ropes, composite belts, etc., the main tensile strength material is used as the inner layer and another material is used as the outer layer as a cover, but in such cases, the adhesion between the resin layer and the main tensile strength material may be insufficient. It is preferable to bond the inner and outer layers of the end-treated portion with an adhesive or the like in advance, and it is suitable that the adhesive is flexible, has high elongation, and has good impregnation properties.

As the resin constituting the resin layer 2 covering the rope-like object 1, a resin having excellent flexibility and strength is used. For example, polyester elastomer is suitable, and other elastomers such as nylon elastomer and urethane elastomer may also be used. Available for use.

The purpose of coating the rope-like object 1 with the resin layer 2 is to insert the end of the rope-like object coated with the resin layer into the metal pipe piece 3 and then press the metal pipe 3 to tightly fit and fasten it. This prevents the rope-like object 1 from being excessively deformed during the plastic deformation of the metal pipe piece 3, and reduces the tightening force caused by the plastic deformation of the metal pipe piece 3 to the metal pipe piece 3.
The objective is to average and apply the rope-like material 1 within the rope. In this case, as the metal pipe, for example, an aluminum alloy pipe, a copper alloy pipe, etc. can be used.

2 and 3 are cross-sectional views taken along the line AA' in FIG.
FIG. 3 shows the state before the pipe piece 3 is inserted into the pipe piece 3 and subjected to pressure plastic deformation, and FIG. 3 shows the state after the pipe piece 3 is pressed and plastically deformed.

The resin layer 2 undergoes large deformation in order to transition from the form shown in FIG. 2 to the form shown in FIG. 3, and a resin that tears, vesicles, or significantly deforms the shape of the rope-like object 1 during this deformation process is not preferable. . Further, when tension is applied to the rope-like object 1, the tension is transmitted to the metal pipe piece 3 through the resin layer 2.
Alternatively, since it will be transmitted and supported by another rope-like object 1, it is preferable to use a resin with excellent strength, and vinyl chloride resin, vulcanized rubber, etc. are insufficient in terms of strength and do not meet the purpose of the present invention. often unachievable. Furthermore, with resins such as nylon 6, cracks occur during the deformation process, making it impossible to achieve the object of the present invention. In order to achieve the purpose of the present invention, the resin used for the resin layer must have a tensile stress of 30% at 10% elongation.
A thermoplastic elastomer having a hardness of 3/cM or more and a Shore hardness of 35 to 55 is suitable.

From the viewpoint of strength, it is preferable that the layer 2 be thinner, but in order to transform from Fig. 2 to Fig. 3 without any trouble, a certain thickness or more is required. When the diameter is from 3M to 6#, if the thickness of the resin layer 2 is less than 1 second, the rope-like object 1 will be significantly deformed and good results will not be obtained.

In Fig. 1, the resin layer 2 covers the entire length of the rope-like object 1, but it is also possible to separately create something corresponding to the resin layer 2 in the shape of a pipe and insert it only in the end-treated portion. Furthermore, it is particularly useful to use a sheet-like material wrapped around the rope-like material 1 when the rope-like material 1 is in the form of a belt.

After the rope-shaped article 1 coated with the resin layer 2 is inserted into the metal pipe piece 3, the pipe piece is plastically deformed using a suitable press device. At this time, the cross-sectional area into which the resin layer 2 and rope-like material 1 shown in FIG. 3 will fit is determined by the shape of the press die.
The cross-sectional area when two rope-like objects are inserted as shown in FIG. 3 is expressed by the following equation, and preferably the coefficient C is 0.4 to 0.8.

S = 2 (a + b x c) S: Cross-sectional area a: Cross-sectional area of the rope-like object 1 b: Cross-sectional area of the resin layer 2 C: Coefficient When the coefficient C is less than 0.4, the resin layer 2 is deformed. If the coefficient G exceeds 0.8, the adhesion between the resin layer 2, the rope-like object 1, and the metal pipe piece 3 may be insufficient. If the rope-like object 1 becomes difficult to handle, slipping may easily occur.

Fig. 1 shows an example in which the rope-like object 1 is folded back, but it can also be applied when there is only one rope-like object 1 as shown in Fig. 5, and it can be used by butting it as shown in Fig. 5. It is also possible to use Furthermore, in addition to fastening by plastic deformation of metal pipes, a fastening method using a screw mechanism such as a wire clip is also possible, and in this case, non-metallic materials such as FRP can also be used.

FIG. 6 is a cross-sectional view of another preferred example in which the rope-like material 1 is folded back and fastened, in which a knot is made at the end of the rope-like material 1 and fixed with epoxy resin to create a fiber ball 4.

The resin used for fixing is not limited to epoxy resin, but epoxy resin is preferable in terms of strength. It is easiest to fix the fiber ball 4 with a knot, but it is sufficient if it is essentially a rope-like material 1 fixed, such as a fiber ball 4 wrapped around a steel round rod and fixed with epoxy resin. But that's fine.

[Example] Example 1 Aromatic polyamide fiber “Kevlar” (registered trademark of DuPont, USA) was used as the fiber forming the O-polymer,
Polyester elastomer is used as the resin that makes up the resin layer.
Hytrel” (registered trademark of DuPont, USA) was used. The diameter of the rope-like object was approximately 3.5 m, and the outer diameter after resin coating was approximately 6.5 m. The rope-shaped article coated with this resin layer was subjected to end treatment as shown in FIG. 1 using an aluminum alloy pipe shown in FIG. 7. The aluminum alloy pipe after plastic deformation had the shape shown in FIG. A, B, C, and D in Figure 7 are approximately 7.14.24.20 m, respectively, and E, F in Figure 8,
D were approximately 7.29.15 InIrI, respectively. The strength of the terminal processing part was approximately 580 kg.

Comparative Example 1 The end of the rope-shaped article used in Example 1 was treated using an aluminum alloy pipe as shown in FIG. 7 without providing a resin layer. A, B, and C in Figure 7.

D was approximately 4.10 and 22.13#, respectively.

Due to the large deformation of the rope-like object, it was not possible to clearly determine the appropriate amount of plastic deformation for the aluminum alloy pipe, but measurements of the strength of the end treatment showed that the rope-like object could be rolled under a load of 200 Kl to 250 Kl. Oops.

Comparative Example 2 The resin layer of Example 1 was replaced with vinyl chloride resin, the same terminal treatment was performed, and the strength was measured. As a result, under a load of 15 ONSF, the resin layer cracked and the rope-like object slipped out, causing the eye portion to be significantly deformed.

Example 2 The resin layer at the end of the rope-like object used in Example 1 was removed,
The "Kevlar" fiber from which the resin layer had been removed was divided into approximately two equal parts, and the fiber cords, which were divided into approximately two equal parts without being impregnated with epoxy resin, were tied together to make the fiber pole 4 shown in FIG. Next, Example 1
When the terminal processing was performed in the same manner as above and the strength of the terminal processing section was measured, it was 'j' at 620.

[Effect of the invention] When the rope-like object 1 is fastened with the aluminum metal pipe 3, by interposing the resin layer 2, flattening of the rope-like object 1 can be prevented to a minimum, and the strength of the rope at the end treatment part is increased. The decrease can be reduced. Roughly, the resin of the resin layer 2 deforms and adheres closely to the shape of the rope-like object 1 around it, and also adheres well to the metal pipe 3, and
Since the resin has excellent strength, a high strength retention rate can be obtained even when tension is applied to the rope-like object 1.

Conventionally, the end treatments for aromatic polyamide fiber ropes include ice splicing, or breaking apart the fibers at the end of the rope and fixing them in a socket with epoxy resin.
Such methods were common. Compared to these methods, the terminal processing method of the present invention requires very short machining time and does not use metal fittings with complicated mechanisms, so the machining cost is also low.

Furthermore, by providing a ball fixed with epoxy resin at the end of the rope, the end treatment strength can be further improved and reliability can be improved.

The end treatment method of the present invention is not limited to end treatment of ropes, but can also be applied to small diameter ropes commonly referred to as cords. In addition, as mentioned above, it can be applied to belt-like objects, but it can also be applied to fixing the edges of roughly wide textiles.

[Brief explanation of the drawing]

FIG. 1 shows a cross-sectional view of a preferred example of an end treatment section to which the method of end treatment of a rope-like object according to the present invention is applied. 2 and 3 are cross-sectional views taken along the line AA' in FIG. 1, with FIG. 2 showing the metal pipe piece before plastic deformation by pressure, and FIG. 3 showing the metal pipe before plastic deformation by pressure. FIG. 4, FIG. 5, and FIG. 6 show cross-sectional views of the next preferred example of the end treatment section to which the method for end treatment of a rope-like object of the present invention is applied. 7 and 8 show a cross-sectional view and a plan view of a metal pipe piece drilled in Example 1 of the present invention, and FIGS. 7(a) and 7(b) are cross-sectional views before press plastic deformation, The plan view is shown in Figure 8(a).
, (b) respectively show a cross-sectional view and a plan view after pressure plastic deformation. 1...Rope-like material 2...Resin layer 3...Metal pipe piece 4...Fiber pole patent applicant Toshi Co., Ltd. Company No. 2 figure
Fig. 3 Fig. 4 Fig. 5 Fig. 6 (a) (b) Fig. 7 (a) +b) Fig. 8 Procedural amendment mouth Showa 6-12/1 Showa Mr. Kunito Ogawa, Commissioner of the Patent Office
-61, Indication of the case 1988 Patent Application No. 255560 2, Name of the invention Method for processing the end of rope-like material 3, Person making the amendment 5, Number of inventions increased by the amendment None 6, Specification subject to the amendment Contents of amendments in the "Detailed Description of the Invention" column and the "Brief Description of the Drawings" column 7 (1) In the specification box, page 7, line 10, "vesicularization" is amended to "embrittlement". (2) "Before plastic deformation" on page 14, line 1 of the specification is corrected to "after plastic deformation." (3) ``Figure 7'' on page 14, line 6 of the specification is corrected to ``Figure 7.''that's all

Claims (1)

[Claims] (1) Tensile strength is 15g/d or more, initial tensile resistance is 4
After coating a rope-like object made of fibers with a weight of 00 g/d or more with a resin layer, the end of the rope-like object coated with this resin layer is inserted into a metal pipe piece, and then the metal pipe piece is pressed. A method for processing the end of a rope-like object, which comprises closely attaching and fastening a pipe piece and a rope-like object.