CN218414009U - Flexible cable - Google Patents

Abstract

The utility model discloses a flexible cable, which comprises an insulated wire core, an inner liner, a buffer layer, a non-woven fabric wrapping layer and an outer sheath from the inside to the outside in sequence, and the buffer layer is composed of a hollow buffer elastic tube and twisted tightly to the inner liner. The utility model forms a buffer layer by tightly twisting hollow buffer elastic tubes in the same direction on the inner lining layer. When the external impact force acts on the cable sheath, because the buffer layer is an elastic hollow tube, the buffer layer can be well Remove the external impact force, so as to protect the cable insulation from the impact of external force and cause insulation short circuit.

Description

a flexible cable

technical field

The utility model relates to the technical field of cables, in particular to a flexible cable.

Background technique

Flexible cables are mainly used in automation fields such as industrial electronic systems, automatic production lines, storage equipment, robots, metallurgical industry, and machine tools. The cable needs to be moved and pulled repeatedly during use, so the cable needs to maintain good flexibility. Although the manufacturing technology of flexible cables in the market is mature, it has always been a technical difficulty of flexible cables to cause cable insulation breakdown and short circuit due to heavy objects falling on the cables, causing safety or quality accidents.

In order to enable the cable to withstand large mechanical external forces, metal materials such as steel strips, steel wires, and aluminum strips are used as the cable armor protection layer to solve the problem of insulation damage caused by cables under mechanical external forces, but it is well known that these metals The cable with the material as the protective layer cannot maintain the flexibility of the cable at all, which limits the application of the cable in the automation system. In addition, because flexible cables need to be moved and used repeatedly, conventional metal armor protection layers are not suitable for flexible cables.

Utility model content

In order to solve the problem that the conventional metal armor protective layer in the prior art is not suitable for flexible cables, the utility model provides a flexible cable. The utility model uses hollow tubes twisted in the same direction on the inner lining layer , using the buffering effect of the hollow tube when it is subjected to external force to protect the cable core from damage, so as to solve the problem of insulation damage caused by the cable under mechanical external force, so that the cable can withstand large mechanical external force.

In order to achieve the above object, the utility model provides the following technical solutions:

A flexible cable, which sequentially includes an insulated core, an inner liner, a buffer layer, a non-woven wrapping layer, and an outer sheath from the inside to the outside. The buffer layer is tightly twisted in the same direction by a hollow buffer elastic tube. on the inner lining.

Preferably, the insulated wire core includes a conductor and an insulating layer, and the conductor is the sixth kind of soft copper conductor (tinned or not tinned); a suitable insulating material is extruded on the conductor to form an insulating layer (material root needs can be optional); the conductor and the insulating layer constitute an insulated core, and the insulated core is twisted rightward at a cable pitch ratio of 8 to 10 times to form a cable core to ensure the bending characteristics of the cable.

Preferably, the inner lining layer is extruded from a TPU material (not limited to other elastomers of TPU material) with a Shore hardness of (85±3) A, and the thickness is controlled between 0.8 mm and 1.2 mm. The function is to extrude and round the cable and fix the insulated core to avoid the internal movement of the insulated core due to repeated traction and movement of the cable, resulting in damage to the insulation layer.

Preferably, the buffer layer is composed of circular, hollow, buffer elastic tubes with equal outer diameters, which are tightly twisted on the inner liner in the same direction, and the twisted joint diameter ratio is controlled at 8 to 10 times, and the hollow tube It is extruded from TPU material with a Shore hardness of (90±3)A.

Preferably, the function of the non-woven wrapping layer is to wrap the twisted buffer tubes flat and tightly, so as to avoid problems such as lifting and stringing of the buffer tubes.

Preferably, the outer sheath is extruded from an elastomer material (the material can be selected according to requirements).

Preferably, the outer sheath is a comprehensive sheath, which sequentially includes an inner sheath, an aramid silk braided mesh, and an outer sheath from inside to outside. During production, the inner sheath is first extruded, and then woven with 1500D aramid yarn, the weaving density is controlled at 60% to 65%, the aramid is woven on the inner sheath, and finally the outer sheath is extruded, the outer sheath Sleeves are extruded over woven aramid mesh. The inner sheath and the outer sheath are extruded in two layers of the same material, so that the same material will be bonded together at the gap of the braided mesh due to the same polarity, forming a tensile comprehensive sheath.

The inner sheath and the outer sheath can be distributed according to the nominal thickness of 2:3, and the outer sheath is thicker, which can ensure that the outer sheath has enough pressure when it is extruded, and can be well connected with the inner sheath, Aramid filaments are bonded together, and the outer sheath must be produced by extrusion, which is also to ensure the pressure during extrusion.

Beneficial effect

The utility model provides a flexible cable. The utility model tightly twists a hollow buffer elastic tube on the inner lining layer in the same direction, and the twisting joint diameter ratio is controlled at 8 to 10 times, thereby forming a buffer layer. When the external impact force acts on the cable sheath, because the buffer layer is an elastic hollow tube, it can well remove the external impact force, thereby protecting the cable insulation from the impact of external force and causing insulation short circuit.

Compared with the prior art, the utility model has at least the following beneficial effects:

(1) The buffer protection layer is made of a hollow elastic tube extruded from a TPU material with a Shore hardness of (90±3)A, twisted at 8 to 10 times, because the twisted joint diameter is relatively small, and the buffer tube is TPU plastic with good elasticity, so the protective layer is very flexible, suitable for mobile application environment.

(2) Due to the hollow design of the buffer layer, the buffering capacity of the buffer layer can be greatly improved, making the cable more resistant to external force impacts, and the buffer layer can also restore the original ability after the external force impact.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of the flexible cable described in the present invention;

Fig. 2 is a schematic cross-sectional structure diagram of the cushioning elastic tube described in the present invention;

Fig. 3 is a schematic cross-sectional structural view of the outer sheath described in Embodiment 2 of the present invention;

In the figure: 1. Conductor; 2. Insulation layer; 3. Inner lining layer; 4. Buffer layer; 5. Non-woven wrapping layer; 6. Outer sheath; 7. Inner sheath; 8. Aramid yarn Woven mesh; 9. Outer sheath.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Example 1

As shown in FIG. 1 , a flexible cable includes an insulated wire core, an inner lining layer 3 , a buffer layer 4 , a non-woven wrapping layer 5 , and an outer sheath 6 from the inside to the outside.

The insulated wire core includes a conductor 1 and an insulating layer 2, and the conductor 1 is the sixth kind of soft copper conductor (tinned or not tinned); a suitable insulating material is extruded on the conductor 1 to form the insulating layer 2 (material root hair The conductor and the insulation layer form an insulated wire core, and the insulated wire core is stranded in the right direction at a cable pitch ratio of 8 to 10 times to form a cable core to ensure the bending characteristics of the cable.

The inner lining layer 3 is extruded from a TPU material (not limited to other elastomers of TPU material) with a Shore hardness of (85±3)A, and its thickness is controlled between 0.8mm and 1.2mm, which acts as Extrude the cable into a round shape, and fix the insulated wire core to avoid internal movement of the insulated wire core due to repeated traction and movement of the cable, resulting in damage to the insulation layer.

The buffer layer 4 is composed of circular, hollow, buffer elastic tubes of equal outer diameter, which are tightly stranded on the inner liner in the same direction. It is extruded from TPU material with a hardness of (90±3)A.

The structural diagram of the buffer elastic tube is shown in Figure 2, in which, L: the wall thickness of the hollow tube is 1.0 mm; D1: the inner diameter of the hollow tube is 1.2 mm; D2: the outer diameter of the hollow tube is 3.2 mm. The structural dimensions of the buffer elastic tube shall comply with the regulations in Figure 2, and the dimensional tolerance shall not be greater than ±5% of the nominal value.

The function of the non-woven fabric wrapping layer 5 is to wrap the twisted buffer tubes evenly and tightly, so as to avoid problems such as warping and stringing of the buffer tubes.

The outer sheath 6 is extruded from an elastomer material (materials can be selected according to requirements).

Example 2

A flexible cable, the difference between the flexible cable described in this embodiment and Embodiment 1 is that:

As shown in FIG. 3 , the outer sheath is a comprehensive sheath, which includes an inner sheath 7 , a braided aramid wire mesh 8 , and an outer sheath 9 from the inside to the outside. During production, the inner sheath is first extruded, and then woven with 1500D aramid yarn, the weaving density is controlled at 60% to 65%, the aramid is woven on the inner sheath, and finally the outer sheath is extruded, the outer sheath Sleeves are extruded over woven aramid mesh. The inner sheath and the outer sheath are extruded in two layers of the same material, so that the same material will be bonded together at the gap of the braided mesh due to the same polarity, forming a tensile comprehensive sheath.

The inner sheath and the outer sheath can be distributed according to the nominal thickness of 2:3, and the outer sheath is thicker, which can ensure that the outer sheath has enough pressure when it is extruded, and can be well connected with the inner sheath, The aramid yarn is bonded together, and the outer sheath must be produced by extrusion, which is also to ensure the pressure during extrusion.

The production flow of the flexible cable described in this embodiment from the outside to the outside is:

Conductor→insulation→cable→extrude inner liner→strand buffer tube (while wrapping non-woven fabric to tighten the buffer tube)→extrude inner sheath→weave aramid yarn→extrude outer sheath.

Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the scope of protection of the utility model. Simple modifications or equivalent replacements to the technical solution of the utility model by those skilled in the art are all acceptable. Do not depart from the essence and scope of the technical solution of the utility model.

Claims (10)

1. A flexible cable, characterized by: from inside to outside in proper order including insulation core, inner liner, buffer layer, non-woven fabrics around covering, oversheath, the buffer layer is in by the inseparable transposition of hollow buffering elastic tube syntropy on the inner liner.

2. A flexible electrical cable according to claim 1, wherein: the buffer layer is formed by tightly twisting round, hollow and equal-outer-diameter buffer elastic tubes on the lining layer in the same direction, and the twisting pitch-diameter ratio is controlled to be 8-10 times.

3. A flexible electrical cable according to claim 2, wherein: the buffering elastic tube is formed by extruding a TPU material with the Shore hardness of 90 +/-3A.

4. A flexible electrical cable according to claim 1, wherein: the insulating wire core comprises a conductor and an insulating layer, and the insulating layer is extruded on the conductor; the conductor is a 6 th soft copper conductor, and is plated with tin or not plated with tin.

5. A flexible cable according to claim 4, wherein: and stranding the insulated wire cores in a right direction cable forming mode according to the cable forming pitch diameter ratio of 8-10 times to form cable forming wire cores.

6. A flexible electrical cable according to claim 1, wherein: the inner liner is formed by extruding and wrapping an elastomer material with the Shore hardness of 85 +/-3A, and the thickness of the inner liner is controlled to be 0.8-1.2 mm.

7. A flexible electrical cable according to claim 1, wherein: the non-woven fabric wrapping layer is used for smoothly and tightly wrapping the twisted buffering elastic tubes.

8. A flexible electrical cable according to claim 1, wherein: the outer sheath is formed by extruding and wrapping an elastomer material.

9. A flexible electrical cable according to claim 1, wherein: the outer sheath comprises an inner sheath, an aramid fiber woven mesh and an outer sheath from inside to outside in sequence.

10. A flexible electrical cable according to claim 9, wherein: the nominal thickness ratio of the inner sheath to the outer sheath is 2; the inner layer sheath and the outer layer sheath are made of the same material.

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