Cable for tensile crane controller

Abstract

The utility model relates to a tensile cable for a crane controller, which is formed by sequentially wrapping a first wrapping layer, a shielding layer, a second wrapping layer and an outer sheath outside a cable core formed by twisting a plurality of wire cores, a filling layer is arranged among the wire cores in the first wrapping layer; the outer diameter of the cable ranges from 19.0 mm to 27.0 mm, and the sectional area of the conductor ranges from 1.0 mm < 2 > to 1.5 mm < 2 >. Each wire core is formed by wrapping an insulating layer outside a conductor; the conductor is formed by twisting tinned copper monofilaments, and the twisting direction is leftward; the insulating layer is made of a low-smoke halogen-free flame-retardant ethylene propylene rubber insulating material; the first wrapping layer and the second wrapping layer are formed by overlapping and wrapping non-woven fabrics; the shielding layer is formed by weaving tinned copper wires; the outer sheath is made of a thermosetting low-smoke halogen-free flame-retardant sheath material; a tensile rope is clamped between the shielding layer and the second wrapping layer, and the axis of the tensile rope is parallel to the axis of the cable. The cable has good tensile capacity, and the problem that the outer sheath is broken due to repeated use is solved.

Description

Technical Field

[0001] The utility model relates to a cable for transmitting control signals, belonging to the technical field of cables, in particular to a cable for a tensile-resistant driving controller. Background Art

[0002] The cable for crane controller is a cable used to connect the crane controller. It is usually composed of multiple weak-point electrical wires and is mainly used for electric hoists, cranes, cranes and other machinery. Its main function is to transmit the start, stop, up, down and other action signals of the crane.

[0003] On-site hoisting equipment is used frequently and for a long period of time. The controller is suspended for a long time, which makes the cable connected to the controller very easy to be damaged, exposing the insulation, reducing the service life of the cable and increasing the risk of leakage. Therefore, the cable used for the crane controller has high requirements for tensile strength, bending resistance and other properties. In order to improve these properties of the control cable, there are also explorations in the existing technology, such as:

[0004] The "Suspension Type Strong Tensile UTP Cable" with announcement number CN205943579U includes a conductor, which is coated with an insulating layer to form an insulated cable conductor, two insulated cable conductors are twisted into an insulated wire pair; a number of the insulated wire pairs and a number of aramid ropes are twisted into a cable core; an inner sheath is extruded on the outer side of the cable core; a tensile layer covering the inner sheath and an outer sheath covering the tensile layer are sequentially arranged outside the inner sheath. The cable is characterized in that the tensile-resistant aramid rope and the core are twisted together to form the cable core. The cable uses too much aramid, and the price of aramid itself is high, which increases the cost of the cable. In addition, aramid is strong, and it is easy to damage the core when the cable is bent.

[0005] The announcement number CN215730944U is "a new type of anti-interference, tensile and wear-resistant control cable", which includes a protective sheath and several wire cores arranged inside the protective sheath. The gaps between the wire cores are filled with tensile filling ropes. The protective sheath includes a nylon sheath arranged on the outermost layer and a combined shielding layer arranged on the inner side of the nylon sheath. The combined shielding layer includes tinned copper wire braiding and aramid yarn braiding. The cable is characterized by the use of tensile filling ropes as filling inside the cable core. It is worth noting that the aramid yarn braided part in the combined shielding layer is a low-density braided structure, and this part of the braided layer is flexible, and does not bring positive effects to the cable in terms of tensile performance. The cable also uses a large amount of aramid, which increases the cost of the cable and takes a long time to braid.

[0006] The "control shielded cable for garbage crane" with announcement number CN218513201U includes: a cable core, an aramid wire braided reinforcement sleeve, a polyurethane inner sheath, a braided shielding layer and a polyurethane outer sheath; the cable core includes a central tensile element and multiple control wire cores; multiple control wire cores are wound side by side on the central tensile element, and the central tensile element is used to disperse the tension of the control wire core. The central tensile element is composed of multiple spirally twisted aramid wires, an aramid wire braided layer outside it, and a thermoplastic elastomer sheath outside it. The characteristic of this cable is that the central tensile element is used to provide tensile resistance, and the wire core is wound outside the central tensile element. The problems existing in this cable are similar to those of the above-mentioned "a new type of anti-interference, tensile and wear-resistant control cable".

[0007] The announcement number is CN206480391U "A control cable", which includes a control core conductor, an aramid fiber tensile member, an insulating layer, a glass fiber tape, a polytetrafluoroethylene tape, a central reinforcement member and a filler. There are multiple control core conductors and they are all arranged around the central reinforcement member; the control core conductors are all provided with aramid fiber tensile members inside, and the control core conductors are all wrapped with an insulating layer on the outside; the control core conductors are wrapped with a glass fiber tape on the outside of the insulating layer; fillers are provided in the gap between the inside of the glass fiber tape and the outside of the insulating layer, and the outside of the glass fiber tape is wrapped with a polytetrafluoroethylene tape. The control core conductor is twisted around the centrally placed aramid fiber tensile member. The conductor of this cable is provided with an aramid fiber tensile member inside, and the production process is difficult, which increases the outer diameter of the conductor and increases the cost of the cable.

[0008] The common characteristics of the above cables are that the tensile structure is located at the axial position of the cable; or the tensile structure and the core together constitute the cable core, and its force is evenly distributed around the axis of the cable; or the positions of two tensile structures are combined.

[0009] In summary, a cable with strong tensile strength is needed to ensure that the cable sheath can avoid cracking after repeated use and extend the service life of the cable. Summary of the invention

[0010] In order to solve the above problems existing in the prior art, improve the tensile performance of the cable, ensure that the cable sheath can be used multiple times without cracking the sheath, and extend the service life of the cable, the utility model provides a tensile-resistant cable for a vehicle controller. The details are as follows:

[0011] A tensile-resistant driving controller cable, which has a structure consisting of a cable core 1 composed of a plurality of twisted wire cores 11, a first wrapping layer 4, a shielding layer 5, a second wrapping layer 6 and an outer sheath 7 wrapped in sequence; a filling layer 3 is provided between each wire core 11 in the first wrapping layer 4;

[0012] The outer diameter of the cable ranges from 19.0 mm to 27.0 mm, and the cross-sectional area of ​​the conductor 111 is 1.0 mm2 ~1.5mm 2 ;

[0013] The wire core 11 is composed of a conductor 111 wrapped with an insulating layer 112;

[0014] The conductor 111 is composed of tinned copper monofilaments with a diameter of 0.193 mm to 0.243 mm, the pitch diameter ratio of the tinned copper monofilaments is in the range of 16 to 25 times, and the twisting direction is left-handed;

[0015] The insulating layer 112 is made of low-smoke halogen-free flame-retardant ethylene-propylene rubber insulating material, and the thickness of the insulating layer 112 ranges from 1.0 mm to 1.2 mm;

[0016] The first wrapping layer 4 and the second wrapping layer 6 are both composed of overlapping non-woven fabrics, the width of the non-woven fabrics is 35 to 50 mm, and the wrapping overlap rate is not less than 20%;

[0017] The shielding layer 5 is formed by weaving tinned copper wires, and the weaving parameters include: a nominal diameter of the weaving wire of 0.15 mm to 0.25 mm, a weaving density of not less than 80%, a weaving angle of 30° to 40°, and a weaving pitch of 35 mm to 45 mm.

[0018] The outer sheath 7 is a thermosetting low-smoke halogen-free flame-retardant sheath material, and the thickness of the outer sheath 7 is in the range of 1.43 mm to 1.8 mm;

[0019] A tensile rope is sandwiched between the shielding layer 5 and the second wrapping layer 6, and the axis of the tensile rope is parallel to the axis of the cable.

[0020] The tensile rope of the cable is located on the side of the cable core, and there is only one rope, which enhances the tensile strength of the cable. At the same time, the tensile rope is located between the tinned copper wire braided layer and the non-woven fabric of the second sheathing layer, which prevents the tensile rope from directly bonding with the outer sheath, and prevents the negative impact of the outer sheath on the outer sheath, which causes the outer sheath to rupture. In addition, the tinned copper wire braided layer not only plays a shielding role, but also because it is made of metal and has high strength, it can prevent the tensile rope from contacting the structure inside it, and prevent the tensile rope from having a negative impact on other structures of the cable.

[0021] In summary, a tensile rope located on the side of the cable core can enhance the tensile strength of the cable and prevent the outer sheath of the cable from rupture.

[0022] Since this cable is used for vehicle driving controller, higher requirements are placed on the flexibility of the cable. Therefore, specific conductor monofilaments and their twisted structures are designed to make the conductor a soft, flex-resistant tinned copper conductor, which fundamentally improves the flexibility of the cable and gives it an excellent bending radius, ensuring that the cable can quickly return to its original state during daily use.

[0023] The low-smoke, halogen-free, flame-retardant EPDM insulation material of a specific thickness has better plasticity than most plastic materials, which can ensure that the insulation layer can quickly return to its original shape after bending.

[0024] Because the controller uses the conductor of the cable to transmit weak signals, the electromagnetic shielding performance of the cable is required to be high, especially the electromagnetic environment of the vehicle operation is more complex, so a shielding layer is designed. In the cable structure, copper wire braiding or copper tape can constitute the shielding layer. Compared with copper tape, copper wire braiding is softer. In this cable, specific braiding parameters are designed. The braiding wire diameter, braiding density, braiding angle and other structures of the shielding layer will also affect the softness and tensile strength of the cable. The specific shielding layer structure of this cable is compatible with other structures of the cable, which minimizes the negative impact on the softness of the cable and fully enhances its positive impact on the tensile strength of the cable.

[0025] In the outer sheath structure, the elongation of the sheath made of thermosetting low-smoke halogen-free flame-retardant sheath material is better than that of the thermoplastic sheath, and it is less likely to break under the same tensile force.

[0026] Further: the material of the tensile rope is aramid fiber.

[0027] Aramid fiber has high strength, and aramid is not only light in weight, but also has negligible structural dimensions. It ensures the tensile strength of the cable with almost no impact on the appearance and weight of the cable.

[0028] Preferably, there are 7 to 19 cores 11; the cross-sectional area of ​​the conductor 111 is 1.0 mm 2 ~1.5mm 2 ;

[0029] Preferably, the filling layer 3 is made of dust-free rock wool rope material.

[0030] Dust-free rock wool rope has good compatibility with EPDM insulation materials, which ensures that the cable maintains full roundness and avoids loosening of the twisted core after long-term bending of the cable, thereby increasing stress on the sheath.

[0031] Preferably, the pitch diameter ratio of the twisted tinned copper monofilaments of the conductor is in the range of 20 to 25 times.

[0032] This structure further optimizes the flexibility of the cable. The larger pitch-to-diameter ratio not only increases the flexibility after twisting, but also reduces the force between the single wires, thereby reducing the damage to the insulation caused by the stress generated after the conductor is bent.

[0033] Preferably, the thickness of the nonwoven fabrics of the first wrapping layer 4 and the second wrapping layer 6 is both 0.1 mm.

[0034] Because the non-woven fabric is a non-hygroscopic wrapping tape, it can ensure that the shielding performance of the cable will not be reduced due to moisture absorption by the first and second wrapping layers. At the same time, the non-woven fabric of this thickness, width and overlap rate has sufficient strength to wrap its inner structure, which also reduces the thickness of this layer structure.

[0035] In summary, the beneficial technical effects of the structural cable include:

[0036] 1. This control cable has better tensile strength. At the same time, the cable structure also improves or even avoids the outer sheath rupture after repeated use, thereby exposing the insulation and shortening the service life of the cable.

[0037] This control cable has a soft, flex-resistant tinned copper conductor, which improves the cable's flexibility and has an excellent bending radius. During daily use, the cable can quickly return to its original shape;

[0038] 2. The larger pitch-diameter ratio of the conductor not only increases the flexibility after twisting, but also reduces the force between the single wires, thereby reducing the damage to the insulation caused by the stress generated after the conductor is bent;

[0039] 3. The shielding layer structure formed by weaving tinned copper wire can increase the flexibility of the cable and increase the tensile strength of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the radial cross section of the cable for the vehicle driving controller in Example 1 of the present application.

[0041] In the figure: 1, cable core; 11, wire core; 111, conductor; 112, insulation layer; 3, filling layer; 4, first wrapping layer; 5, shielding layer; 6, second wrapping layer; 7, outer sheath. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0043] refer to Figure 1 The tensile-resistant driving controller cable of this example is composed of a cable core 1 composed of a plurality of 7 cores 11 twisted together, and is sequentially wrapped with a first wrapping layer 4, a shielding layer 5, a second wrapping layer 6 and an outer sheath 7; between each core 11 in the first wrapping layer 4 is a filling layer 3;

[0044] The outer diameter of the cable ranges from 19.0 mm to 27.0 mm, and the cross-sectional area of ​​the conductor 111 is 1.0 mm 2 ~1.5mm 2 ;

[0045] The wire core 11 is composed of a conductor 111 wrapped with an insulating layer 112;

[0046] The conductor 111 is composed of tinned copper monofilaments with a diameter of 0.193 mm to 0.243 mm, the pitch diameter ratio of the tinned copper monofilaments is in the range of 16 to 25 times, and the twisting direction is left-handed;

[0047] The insulating layer 112 is made of low-smoke halogen-free flame-retardant ethylene-propylene rubber insulating material, and the thickness of the insulating layer 112 ranges from 1.0 mm to 1.2 mm;

[0048] The first wrapping layer 4 and the second wrapping layer 6 are both composed of overlapping non-woven fabrics, the width of the non-woven fabrics is 35 to 50 mm, and the wrapping overlap rate is not less than 20%;

[0049] The shielding layer 5 is formed by weaving tinned copper wires, and the weaving parameters include: a nominal diameter of the weaving wire of 0.15 mm to 0.25 mm, a weaving density of not less than 80%, a weaving angle of 30° to 40°, and a weaving pitch of 35 mm to 45 mm.

[0050] The outer sheath 7 is a thermosetting low-smoke halogen-free flame-retardant sheath material, and the thickness of the outer sheath 7 is in the range of 1.43 mm to 1.8 mm;

[0051] A tensile rope is sandwiched between the shielding layer 5 and the second wrapping layer 6, and the axis of the tensile rope is parallel to the axis of the cable.

[0052] In this example: the material of the tensile rope is aramid fiber. The filling layer 3 is made of dust-free rock wool rope material. The twisted pitch ratio of the tinned copper monofilament of the conductor is in the range of 20 to 25 times. The thickness of the non-woven fabric of the first wrapping layer 4 and the second wrapping layer 6 is 0.1 mm.

[0053] Low-smoke, halogen-free, flame-retardant EPDM rubber insulation material, the commercially available brand is XJ-32HB product.

[0054] Thermosetting low-smoke halogen-free flame-retardant sheath material, the commercially available brand is XH-32HB product.

[0055] The parameter of aramid fiber is 3160dtex.

[0056] Generally speaking, 7 to 19 wire cores 11 can meet the use requirements of most vehicle driving controllers.

Claims

1. A cable for a tensile driving controller, characterized in that A cable core (1) formed by twisting a plurality of wire cores (11) is wrapped in sequence with a first wrapping layer (4), a shielding layer (5), a second wrapping layer (6) and an outer sheath (7); a filling layer (3) is provided between each wire core (11) in the first wrapping layer (4); The outer diameter of the cable ranges from 19.0mm to 27.0mm, and the cross-sectional area of ​​the conductor (111) is 1.0mm 2 ~1.5mm 2 ; The wire core (11) is composed of a conductor (111) wrapped with an insulating layer (112); The conductor (111) is composed of tinned copper monofilaments with a diameter of 0.193 mm to 0.243 mm, the pitch diameter ratio of the tinned copper monofilaments is in the range of 16 to 25 times, and the twisting direction is left-handed; The insulating layer (112) is made of low-smoke halogen-free flame-retardant ethylene-propylene rubber insulating material, and the thickness of the insulating layer (112) ranges from 1.0 mm to 1.2 mm; The first wrapping layer (4) and the second wrapping layer (6) are both formed by overlapping non-woven fabrics, the width of the non-woven fabrics is 35 to 50 mm, and the wrapping overlap rate is not less than 20%; The shielding layer (5) is formed by braiding tinned copper wires, and the braiding parameters include: the nominal diameter of the braided wire is 0.15 mm to 0.25 mm, the braiding density is not less than 80%, the braiding angle is 30° to 40°, and the braiding pitch is 35 to 45 mm; The outer sheath (7) is a thermosetting low-smoke halogen-free flame-retardant sheath material, and the thickness of the outer sheath (7) is in the range of 1.43 mm to 1.8 mm; A tensile rope is sandwiched between the shielding layer (5) and the second wrapping layer (6), and the axis of the tensile rope is parallel to the axis of the cable.

2. The cable for the tensile-resistant driving controller according to claim 1 is characterized in that The material of the tensile rope is aramid fiber.

3. The cable for the tensile-resistant driving controller according to claim 1 is characterized in that The number of the wire cores (11) is 7 to 19.

4. The cable for the tensile-resistant driving controller according to claim 1 is characterized in that The filling layer (3) is made of dust-free rock wool rope material.

5. The cable for the tensile-resistant driving controller according to claim 1 is characterized in that The pitch diameter ratio of the stranded tinned copper monofilaments of the conductor is in the range of 20 to 25 times.

6. The cable for the tensile-resistant driving controller according to claim 1 is characterized in that The thickness of the non-woven fabrics of the first wrapping layer (4) and the second wrapping layer (6) is both 0.1 mm.

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