A connecting cable for grating light curtain

Abstract

The present invention discloses a connecting cable for grating light curtains, comprising a cable core comprising multiple wire cores, each of which includes a conductor and a nitrile rubber insulation layer coated thereon. A aramid yarn filling layer is filled between the wire cores and twisted together to form a cable core. The cable core is sequentially coated with a polyester tape wrapping layer, a tinned copper wire braided shielding layer, and a nitrile rubber sheathing layer from the inside out. A conductor reinforcement core is twisted into the conductor. By designing the conductor structure and filling layer, as well as the material composition of the polyester tape wrapping layer, the present invention meets the requirements for use in grating light curtains, achieves tensile strength for both the conductor and the entire cable, and exhibits softness, oil resistance, and wear resistance.

Description

Technical Field

[0001] The present invention relates to the field of cables, in particular to a connecting cable for grating light curtains. Background Art

[0002] Originally, the connecting cables for gratings and light curtains used ordinary RVVP cables. However, due to their specific application requirements, these cables now require shielding, oil- and wear-resistant sheaths, flexibility, and tensile strength throughout the cable, with an outer diameter that cannot exceed design specifications. The original connecting cables no longer meet these requirements. Summary of the Invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes a connecting cable for a grating light curtain.

[0004] The technical solution adopted in the present invention is:

[0005] A connecting cable for a grating light curtain comprises a cable core, wherein the cable core comprises a plurality of wire cores, each of the wire cores comprising a conductor and a nitrile rubber insulation layer coated on the outside of the conductor, an aramid yarn filling layer is filled between the wire cores and twisted into a cable core, the cable core is coated with a polyester tape wrapping layer, a tinned copper wire braided shielding layer, and a nitrile rubber sheathing layer in sequence from the inside to the outside, and a conductor reinforcement core is twisted in the conductor.

[0006] The conductor reinforcement core is aramid yarn wrapped with a layer of copper foil.

[0007] The polyester tape wrapping layer is made of the following raw materials in parts by weight:

[0008] Polycarbonate 60-70, tributyl citrate 8-11, calcium stearate 3-5, modified polyester 20-30.

[0009] The method for preparing the polyester tape wrapping layer comprises the following steps:

[0010] (1) Take 20-30 parts by weight of lignin, add it to 30-40 times of its weight of N,N-dimethylformamide, put it into a stirred tank, add 20-30 parts by weight of 4-dimethylaminopyridine, stir evenly, place it in an ice-water bath, add 50-60 parts by weight of 2-bromo-2-methylpropionyl bromide, let it stand for 3-5 hours, discharge it, stir it at room temperature for 15-20 hours, vacuum filter it, wash the filter cake with water, and vacuum dry it at 50-55°C to obtain the initiator;

[0011] (2) Take 60-70 parts by weight of methyl methacrylate, add it to 10-20 times the weight of N,N-dimethylformamide, stir evenly, and obtain a monomer dispersion;

[0012] (3) 10-15 parts by weight of diatomaceous earth powder is mixed with 2-3 parts by weight of silane coupling agent KH550, and the mixture is added to the above monomer dispersion, and ultrasonicated for 1-2 hours to obtain a pretreated dispersion;

[0013] (4) Take the initiator, add it to the above-mentioned pretreated dispersion, send it into the reactor, introduce nitrogen, adjust the reactor temperature to 70-80°C, add 1-2 parts by weight of cuprous bromide, stir and react for 3-4 hours, add 40-50 parts by weight of terephthalic acid and 100-120 parts by weight of ethylene glycol dropwise, after the addition is complete, increase the reactor temperature to 200-220°C, stir and react for 3-4 hours, increase the temperature to 280-290°C, continue to stir and react for 3-4 hours, discharge the material, mix it with polycarbonate, tributyl citrate and calcium stearate, stir evenly, send it into an extruder, melt extrude, cool, and obtain.

[0014] The advantages of the present invention are:

[0015] The present invention meets the requirements of grating light curtain use by designing the conductor structure and filling layer, as well as the sheath material composition, and realizes the tensile strength of the conductor and the entire cable, and has softness, oil resistance, and wear resistance.

[0016] The present invention achieves softness, oil resistance and wear resistance by adding a tensile unit into the conductor: a layer of copper foil is wrapped around the aramid yarn, the filling layer uses aramid yarn instead of traditional PP rope filling, and the sheath uses soft nitrile rubber.

[0017] The polyester tape wrapping material of the present invention uses lignin as a raw material to prepare a cellulose-based ATRP initiator, which then initiates the polymerization of methyl methacrylate. During the polymerization, surface-modified diatomaceous earth powder is introduced, and terephthalic acid and ethylene glycol are also added. Through direct esterification and subsequent polymerization, a polyester / diatomaceous earth / polymethyl methacrylate composite material is obtained. The composite material has excellent toughness and strength, can significantly improve the tensile properties of the finished product, has high flexibility, and has strong fracture resistance. The diatomaceous earth filler of the present invention can be evenly dispersed in the polyester tape wrapping layer without causing agglomeration, and the finished product has strong mechanical stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] In the figure: conductor 1, nitrile rubber insulation layer 2, aramid yarn filling layer, polyester tape wrapping layer 4, tinned copper wire braided shielding layer 5, nitrile rubber sheath layer 6, conductor reinforcement core 7. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Example 1.

[0022] like Figure 1 As shown, a connecting cable for a grating light curtain includes a cable core, which includes multiple wire cores. Each wire core includes a conductor 1 and a nitrile rubber insulation layer 2 coated on the outside of the conductor 1. An aramid yarn filling layer 3 is filled between the wire cores and twisted into a cable core. The cable core is coated with a polyester tape wrapping layer 4, a tinned copper wire braided shielding layer 5, and a nitrile rubber sheath layer 6 from the inside to the outside. A conductor reinforcement core 7 is twisted in the conductor 1, and the conductor reinforcement core 7 is a layer of copper foil wrapped around the aramid yarn.

[0023] The polyester tape wrapping layer is made of the following raw materials in parts by weight:

[0024] Polycarbonate 60, tributyl citrate 8, calcium stearate 3, modified polyester 20.

[0025] The method for preparing a polyester tape wrapping layer comprises the following steps:

[0026] (1) Take 20 parts by weight of lignin, add it to 30 times its weight of N,N-dimethylformamide, put it into a stirred tank, add 20 parts by weight of 4-dimethylaminopyridine, stir evenly, place it in an ice-water bath, add 50 parts by weight of 2-bromo-2-methylpropionyl bromide, let it stand for 3 hours, discharge it, stir it at room temperature for 15 hours, vacuum filter it, wash the filter cake with water, and vacuum dry it at 50°C to obtain the initiator;

[0027] (2) Take 60 parts by weight of methyl methacrylate and add it to 10 times its weight of N,N-dimethylformamide, stir evenly to obtain a monomer dispersion;

[0028] (3) 10 parts by weight of diatomaceous earth powder was mixed with 2 parts by weight of silane coupling agent KH550, added to the above monomer dispersion, and ultrasonicated for 1 hour to obtain a pretreated dispersion;

[0029] (4) Take the initiator, add it to the above-mentioned pretreated dispersion, send it into the reactor, introduce nitrogen, adjust the reactor temperature to 70°C, add 1 part by weight of cuprous bromide, stir and react for 3 hours, add 40 parts by weight of terephthalic acid and 100 parts by weight of ethylene glycol dropwise, raise the reactor temperature to 200°C after the addition is complete, stir and react for 3 hours, raise the temperature to 280°C, continue to stir and react for 3 hours, discharge the material, mix it with polycarbonate, tributyl citrate and calcium stearate, stir evenly, send it into an extruder, melt extrude, cool, and obtain.

[0030] Example 2.

[0031] like Figure 1 As shown, a connecting cable for a grating light curtain includes a cable core, which includes multiple wire cores. Each wire core includes a conductor 1 and a nitrile rubber insulation layer 2 coated on the outside of the conductor 1. An aramid yarn filling layer 3 is filled between the wire cores and twisted into a cable core. The cable core is coated with a polyester tape wrapping layer 4, a tinned copper wire braided shielding layer 5, and a nitrile rubber sheath layer 6 from the inside to the outside. A conductor reinforcement core 7 is twisted in the conductor 1, and the conductor reinforcement core 7 is a layer of copper foil wrapped around the aramid yarn.

[0032] The polyester tape wrapping layer is made of the following raw materials in parts by weight:

[0033] Polycarbonate 70, tributyl citrate 11, calcium stearate 5, modified polyester 30.

[0034] The method for preparing a polyester tape wrapping layer comprises the following steps:

[0035] (1) Take 30 parts by weight of lignin, add it to 40 times its weight of N,N-dimethylformamide, put it into a stirred tank, add 30 parts by weight of 4-dimethylaminopyridine, stir evenly, place it in an ice-water bath, add 60 parts by weight of 2-bromo-2-methylpropionyl bromide, let it stand for 5 hours, discharge it, stir it at room temperature for 20 hours, vacuum filter it, wash the filter cake with water, and vacuum dry it at 55°C to obtain the initiator;

[0036] (2) Take 70 parts by weight of methyl methacrylate and add it to 20 times its weight of N,N-dimethylformamide, stir evenly to obtain a monomer dispersion;

[0037] (3) 15 parts by weight of diatomaceous earth powder was mixed with 3 parts by weight of silane coupling agent KH550, added to the above monomer dispersion, and ultrasonicated for 2 hours to obtain a pretreated dispersion;

[0038] (4) Take the initiator, add it to the above-mentioned pretreated dispersion, send it into the reactor, introduce nitrogen, adjust the reactor temperature to 80°C, add 2 parts by weight of cuprous bromide, stir and react for 4 hours, add 50 parts by weight of terephthalic acid and 120 parts by weight of ethylene glycol dropwise, raise the reactor temperature to 220°C after the addition is complete, stir and react for 4 hours, raise the temperature to 290°C, continue to stir and react for 4 hours, discharge the material, mix it with polycarbonate, tributyl citrate and calcium stearate, stir evenly, send it into an extruder, melt extrude, cool, and obtain.

[0039] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A connecting cable for a grating light curtain, characterized in that: A cable core is provided, wherein the cable core comprises a plurality of wire cores, each of the wire cores comprises a conductor (1) and a nitrile rubber insulation layer (2) coated on the outside of the conductor (1), an aramid yarn filling layer (3) is filled between the wire cores and twisted into a cable core, the cable core is sequentially coated with a polyester tape wrapping layer (4), a tinned copper wire braided shielding layer (5), and a nitrile rubber sheath layer (6) from the inside to the outside, and a conductor reinforcement core (7) is twisted in the conductor (1); The polyester tape wrapping layer is made of the following raw materials in parts by weight: Polycarbonate 60-70, tributyl citrate 8-11, calcium stearate 3-5, modified polyester 20-30; The method for preparing the polyester tape wrapping layer comprises the following steps: (1) Take 20-30 parts by weight of lignin, add it to 30-40 times of its weight of N,N-dimethylformamide, put it into a stirred tank, add 20-30 parts by weight of 4-dimethylaminopyridine, stir evenly, place it in an ice-water bath, add 50-60 parts by weight of 2-bromo-2-methylpropionyl bromide, let it stand for 3-5 hours, discharge it, stir it at room temperature for 15-20 hours, vacuum filter it, wash the filter cake with water, and vacuum dry it at 50-55°C to obtain the initiator; (2) Take 60-70 parts by weight of methyl methacrylate, add it to 10-20 times the weight of N,N-dimethylformamide, stir evenly, and obtain a monomer dispersion; (3) 10-15 parts by weight of diatomaceous earth powder is mixed with 2-3 parts by weight of silane coupling agent KH550, and the mixture is added to the above monomer dispersion, and ultrasonicated for 1-2 hours to obtain a pretreated dispersion; (4) Take the initiator, add it to the above-mentioned pretreated dispersion, send it into the reactor, introduce nitrogen, adjust the reactor temperature to 70-80°C, add 1-2 parts by weight of cuprous bromide, stir and react for 3-4 hours, add 40-50 parts by weight of terephthalic acid and 100-120 parts by weight of ethylene glycol dropwise, after the addition is complete, increase the reactor temperature to 200-220°C, stir and react for 3-4 hours, increase the temperature to 280-290°C, continue to stir and react for 3-4 hours, discharge the material, mix it with polycarbonate, tributyl citrate and calcium stearate, stir evenly, send it into an extruder, melt extrude, cool, and obtain.

2. A connecting cable for a grating light curtain according to claim 1, characterized in that: The conductor reinforcement core (7) is an aramid yarn wrapped with a layer of copper foil.

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