JPH022246B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD This invention relates to a mobile cable used as a power supply cable for various types of mobile equipment, that is, a so-called cab tire cable, and in particular a cable in which a plurality of conductors made of stranded wires are arranged in parallel on one plane. This invention relates to a flat moving cable that has a flat overall shape. Prior Art As shown in Fig. 3, a conventional flat moving cable has a conductor 1 made of stranded wires such as stranded copper wire or stranded aluminum wire, and is coated with paper such as kraft paper or polyethylene terephthalate (PET). A separator 2 is formed by wrapping one or two plastic films such as polypropylene or nylon, or films coated with hot melt adhesive on these plastic films, and then a rubber such as ethylene, propylene, rubber, etc. is formed on top of the separator 2. A plurality of unit insulated cables 4A, 4B, 4C are formed by covering the conductor 1 with the rubber insulator 3 through the separator 2.
are arranged in parallel on one plane, and a coarse braid 5 for reinforcement is applied as necessary, and these unit insulated cables 4 are
It is known that A, 4B, and 4C are collectively covered with a sheath 6 made of rubber, synthetic resin, or the like with excellent abrasion resistance. Problems to be Solved by the Invention In the conventional flat moving cable shown in Figure 3, an abnormally excessive tension is applied when the cable is wound on a reel or when the cable is pulled out from the reel. If this occurs, the cable may become undulated or twisted, which may cause the cable to become caught in the mobile device or surrounding machinery during use, interfering with the normal operation of the mobile device, or causing the cable conductor core to break. This could lead to situations such as. As mentioned above, the cause of waviness and twisting caused by abnormal tension in the conventional flat moving cable is considered to be mainly due to slippage between the conductor 1 and the separator 2. In other words, in general, the direct cause of waviness and twisting caused by abnormal tension in flat cables is that abnormal tension causes slippage between the outer layer and the inner layer, causing slippage between the outer layer and the inner layer. However, in the above-mentioned conventional flat moving cable, local deviations may occur between the separator 2 and the rubber insulator 3, between the rubber insulator 3 and the reinforcing coarse braid 5, and Normally, the reinforcing coarse braid 5 and the outer sheath 6 are finally fully bonded by vulcanization during the manufacturing process, so there is almost no slippage between them. It is unlikely to cause waviness or twisting due to abnormal tension, etc.
On the other hand, there is often no adhesive between the separator 2 and the conductor 1, and even if a film coated with hot melt adhesive is used for the separator 2, the hot melt adhesive layer quickly forms during actual use. It is normal for the adhesive to be destroyed and have almost no adhesive force except at the beginning of use.
Therefore, slippage is likely to occur between the separator 2 and the conductor 1 due to abnormal tension, leading to the occurrence of waviness and twisting of the cable. Therefore, this invention makes it difficult for slippage to occur between the conductor and the separator inserted between the conductor and the insulating rubber, and prevents the occurrence of waviness or twisting due to abnormal tension acting on the cable. The purpose of the present invention is to provide a flat-type mobile cable with a flat design. Means for Solving the Problems In the flat moving cable of the present invention, a composite cloth or film coated with rubber on at least one side is used as a separator inserted between the conductor and the rubber insulator. By using a tape and wrapping the composite tape around the conductor so that the rubber coating layer of the composite tape is in contact with the conductor surface, slippage between the conductor and the composite tape as a separator is prevented. In other words, the flat moving cable of the present invention includes a composite tape in which at least one side of a tape made of cloth or film is coated with rubber, and the rubber coating layer is coated on each of a plurality of conductors made of stranded wires. A plurality of unit rubber insulated cables are formed by wrapping the composite tape so as to be in contact with the surface of the conductor and coating the rubber insulator on the surface on which the composite tape is wound. The unit rubber insulated cables are arranged in parallel on a plane and are collectively covered with a jacket. Embodiment Hereinafter, a flat moving cable according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2. FIG. 1 shows an example of a composite tape 7 used as a separator in the flat moving cable of the present invention. A rubber coating layer 9 is formed on the surface. Figure 2 shows the composite tape 7 in Figure 1.
This figure shows an example of a flat moving cable of the present invention using a cable, in which each of a plurality of conductors 1 is made of a stranded wire made by twisting a large number of good conductive wires 10 such as copper wire or aluminum wire. The composite tape 7 is wound on top of the conductor 1 so that its rubber coating layer 9 is in contact with the surface of the conductor 1, and a plurality of rubber insulators 3 such as ethylene, propylene, rubber, etc. are coated on top of the composite tape 7. unit rubber insulated cables 4A, 4B, and 4C are formed. And those multiple unit insulated cables 4A, 4B, 4
C are arranged in parallel on one plane, and a reinforcing coarse braid 5 is applied to the entire unit insulated cables 4A, 4B, 4C, and the unit insulated cables 4A, 4B, 4C are
The reinforcing coarse braid 5 is collectively covered with an outer sheath 6 made of chloroprene rubber or the like. In flat moving cables such as those mentioned above,
The rubber coating layer 9 of the composite tape 7 serving as a separator is in contact with the surface of the conductor 1, and the rubber of this coating layer 9 bites between the individual wires 10 constituting the conductor 1, and as a result, the composite tape 7 This makes it difficult for the cable to slip between the conductor 1 and the conductor 1, and effectively prevents the cable from undulating or twisting due to slipping inside the cable due to abnormal tension. As the bucking tape 8 of the composite tape, synthetic fiber cloth such as polyester, nylon, acrylic, phenol, etc., natural fiber cloth such as cotton cloth, human silk cloth, and cloth tape of carbon fiber, glass fiber, etc. can be used. Although desirable, a nonwoven fabric made of these fibers or a thin synthetic resin film may also be used in some cases. Among the above-mentioned cloth tapes, phenol, carbon fiber, glass fiber, cotton cloth, human silk, etc., which have low thermal expansion even at the cable's rated operating temperature of 80° C., are particularly desirable. On the other hand, various rubbers such as ethylene propylene rubber, chloroprene rubber, butyl rubber, and natural rubber can be used as the rubber for the coating layer 9 of the tape 7, but among these, butyl rubber or ethylene propylene rubber is particularly used because of its high adhesiveness. It is preferable to use Further, although this rubber coating layer 9 may be vulcanized in advance, it is softer in an unvulcanized state and bites into the space between the strands 10 better, so it is usually not vulcanized. It is preferable to use it as is. Furthermore, the thickness of the rubber coating layer 9 is preferably thicker from the viewpoint of preventing slippage, but if it is too thick, it will impair economic efficiency and lead to an increase in the diameter of the cable. The total thickness of the composite tape 7 including the backing tape 8 is suitably about 0.15 to 0.60 mm. Moreover, the winding of the composite tape 7 around the conductor 1 is as follows.
Usually, it is preferable to wrap the tape 7 so that about 1/2 to 1/6 of the total width thereof is wrapped. Next, an example will be described in which the present invention was applied to an actual flat moving cable and the anti-slip effect was investigated. The applied cable consists of 3 conductors with a cross-sectional area of ^125mm2 .
This is a flat type 3 grade ethylene propylene insulated, chloroprene sheathed skib tire cable, and the materials and dimensions of each part are as follows. Conductor: 42 conductors with a wire diameter of 0.45 mm are twisted together, and 19 conductors are further twisted together, and the outer diameter is 16.8
mm. Composite tape: Unvulcanized butyl rubber was used as the rubber coating layer, and various tapes shown in Table 1 were used as the backing tapes.
The thicknesses of the rubber coating layer and backing tape are as shown in Table 1. Rubber insulation: using ethylene propylene rubber,
Its thickness was 2.7 mm. Embedded reinforcing braid: 5/16S hemp thread was used. Outer cover (sheath): Chloroprene rubber was used, and the thickness was 5.0 mm. Four types of cables A as examples of the present invention
~ D, and as comparative examples, cable E uses a 25 μm thick PET film with a 5 μm thick hot melt adhesive layer as a separator, and cable F uses 50 μm thick kraft paper as a separator. To make the determination, the force required to pull out the conductor (pulling force) was investigated. Comparative examples E, F
The cable was subjected to the same conditions as above except for the separator. In this experiment, the pulling force was defined as the force required to pull out the conductor from a state where the conductor was inserted into the insulator for a length of 50 mm. Although this experiment was conducted at room temperature (15-30°C), the same experiment was also conducted at 60°C depending on the cable. The results are shown in Table 1.

【table】

[Table] As is clear from Table 1, in the cable of Comparative Example F, which used conventional kraft paper as a separator, the conductor pullout force at room temperature was 10 kg, which was extremely small. Even with the cable of Comparative Example E used, the conductor pullout force at room temperature was only 15 kg at most, and in that case, the conductor pullout force was significantly reduced to 7 kg at a high temperature of 60°C. On the other hand, cables A to D of this invention all have conductor pullout force at room temperature.
It is clear that the conductor pull-out force decreases relatively little at 50Kg or more and at a high temperature of 60°C, and therefore it is clear that conductor slippage can be effectively suppressed. Furthermore, when the cables A to D of the examples of the present invention were actually used, it was confirmed that almost no waviness or twisting occurred. Effects of the Invention As is clear from the above description, according to the flat moving cable of the present invention, at least one side of the cloth or film is coated with rubber as a separator inserted between the conductor and the rubber insulator. The composite tape is used as a separator and is wrapped around the conductor so that the rubber coating layer is in contact with the conductor surface, so even if abnormal tension is applied to the cable, the composite tape will not act as a separator. This effectively prevents slipping between the tape and the conductor, and therefore effectively prevents the cable from undulating or twisting. It is possible to prevent accidents such as disconnection of conductors or conductors from occurring.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of a composite tape used in the flat cable of the present invention, FIG. 2 is a cutaway perspective view of an example of the flat cable of the present invention, and FIG. 3 is a conventional tape. FIG. 2 is a sectional view showing an example of a flat moving cable. 1...Conductor, 3...Rubber insulator, 4A, 4B,
4C...Unit rubber insulated cable, 5...Sheath, 7...Composite tape, 8...Backing tape (cross or film), 9...Rubber coating layer.

Claims (1)

[Claims] 1. Composite tape with rubber coating on at least one side of cloth, nonwoven fabric, or film is applied to each of multiple conductors consisting of stranded wires,
The rubber coating layer is wrapped so as to be in contact with the conductor surface, and the composite tape wrapping surface is coated with a rubber insulator to form a plurality of unit rubber insulated cables. A flat moving cable in which unit rubber insulated cables are arranged in parallel on one plane, and the unit rubber insulated cables are collectively covered with an outer sheath.