CN112750560B - Improved electrocardiogram instrument cable and preparation method thereof - Google Patents
Improved electrocardiogram instrument cable and preparation method thereof Download PDFInfo
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- CN112750560B CN112750560B CN202011570651.6A CN202011570651A CN112750560B CN 112750560 B CN112750560 B CN 112750560B CN 202011570651 A CN202011570651 A CN 202011570651A CN 112750560 B CN112750560 B CN 112750560B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/0009—Details relating to the conductive cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/0045—Cable-harnesses
Abstract
The application relates to the field of cable manufacturing, in particular to an improved electrocardiogram instrument cable and a preparation method thereof, wherein the improved electrocardiogram instrument cable sequentially comprises a conductor 1, a semi-conductive shielding layer 2, an insulating layer 3, an outer shielding layer 4 and an outer sheath 5 from inside to outside; the semi-conductive shielding layer 2 is a semi-conductive adhesive mixture; the conductor 1, the semi-conductive shielding layer 2 and the insulating layer 3 form a conductive wire core, and the conductive wire core contained in the conductive wire core is at least a single core and at most 50 cores; the semiconductive viscose mixture is prepared from the following raw materials in parts by weight: 25-35 parts of conductive magnetic agent powder; 8-10 parts of thermoplastic acrylic resin; 36-48 parts of a surfactant; 13-17 parts of an alkali series retaining agent; 17-25 parts of a solvent; the electric and magnetic conductive agent powder is prepared by uniformly mixing the following raw materials in parts by weight: 12.5 to 17.5 portions of superfine silver-plated copper powder; 12.5 to 17.5 portions of superfine nickel-coated copper powder. The electrocardio weak signal transmitted by the cable of the feeding type electrocardiograph is not easily interfered by internal and external factors, and the signal fidelity is favorably ensured.
Description
Technical Field
The application relates to the field of cable manufacturing, in particular to an improved electrocardiogram instrument cable and a preparation method thereof.
Background
The electrocardiograph cable is an electronic component for transmitting the physiological and electrical activities of cardiac cells collected by a sensor to a receiver in the electrocardiograph, the electrocardiograph signals are processed and calculated by an amplifier, a processor and the like to output fluctuation patterns and data, and the electrocardiograph cable is vital to generation and interpretation of an electrocardiograph and diagnosis and treatment of diseases.
The electrocardiograph usually has 1 lead, 3 leads, 6 leads and 12 leads up to 50, the connection between the inside and outside components such as amplifier, processor, computer and printer and the connection between the whole machine and the external network system all use the signal transmission cable, the structure of the traditional cable is almost the same, namely the single-core or multi-core insulated wire is added with the shielding and the outer sheath. The most important index of cable quality is signal fidelity, and the technical guarantee of the cable is mainly signal fidelity and electromagnetic field shielding. Because the physiological electricity of a human body is a weak electromagnetic signal, in order to improve the success rate of diagnosis of heart diseases, the perfect design of a electrocardiogram instrument cable is emphasized.
The core wire of the traditional cable is generally formed by twisting 7 or more strands of bare copper or tinned copper stranded wires and adding an insulating layer, but the outer surface of the stranded wire is provided with a plurality of salient points, one of the salient points is easy to cause signal attenuation due to point discharge, and the other is vibration and cable bending when the instrument is used, so that intrinsic electrostatic noise is often generated between a conductor and the insulating layer due to sliding and friction, so that the signal to noise ratio is reduced.
The outer conductor shielding layer of the traditional cable is usually double-layer, the inner layer is an aluminum-plastic composite film, the outer layer is a bare copper or tinned copper wire braid, wherein the inner layer mainly plays a role in shielding a high-frequency electric field, the outer layer mainly plays a role in shielding a low-frequency magnetic field, and the inner layer and the outer layer jointly shield interference from internal and external electromagnetic fields; but actually, after the cable is made into a finished product, when medical staff use, the aluminum-plastic composite film is cracked by the multiple bending and wrinkling of the cable, the existence of the fracture causes discontinuous conductivity and interference caused by the penetration of shielded high-frequency radio electromagnetic waves from the external space to the inside of the cable through the gap to cause electrocardio signal distortion; secondly, because the electrocardiosignal is a low-frequency signal (0-120Hz), the external object to be shielded should be a low-frequency (0-1kHz) electromagnetic wave, and a low-magnetic resistance passage is optimally formed by a high-permeability material for magnetic shielding, while the traditional cable outer shielding layer usually adopts an oxygen-free copper wire good conductor, and the good conductor has low shielding effectiveness on a low-frequency magnetic field, and simultaneously, because the electromagnetic wave generated by an external low-frequency interference source (such as an alternating current power line, a transformer, indoor electric appliances, lighting circuits and the like) easily penetrates through the copper metal braided shielding layer, the interference effect on the weak electric signal transmitted by the internal core wire is achieved. Therefore, the traditional cable structure is not designed carefully, the shielding material has a plurality of technical defects, and the best effect on the signal transmission of the electrocardiograph is difficult to obtain.
In view of the related art in the above, the present invention considers: in practical application, weak signals transmitted by the electrocardiograph cable are easy to interfere, and signal fidelity is difficult to guarantee.
Disclosure of Invention
In order to ensure that the transmitted electrocardio weak signals are not easily interfered by internal and external factors and ensure the signal fidelity, the application provides an improved electrocardiogram instrument cable and a preparation method thereof.
The application provides an improved generation electrocardiogram instrument cable adopts following technical scheme:
an improved electrocardiogram instrument cable comprises a conductor, a semi-conductive shielding layer, an insulating layer, an outer shielding layer and an outer sheath in sequence from inside to outside; the semi-conductive shielding layer is a semi-conductive adhesive mixture; the conductor, the semi-conductive shielding layer and the insulating layer form a conductive wire core, and the conductive wire core is at least a single core and at most 50 cores;
the semiconductive viscose mixture is prepared from the following raw materials in parts by weight:
25-35 parts of conductive magnetic agent powder;
8-10 parts of thermoplastic acrylic resin;
36-48 parts of a surfactant;
13-17 parts of an alkali series retaining agent;
17-25 parts of a solvent;
the conductive magnetic agent powder is prepared by uniformly mixing the following raw materials in parts by weight:
12.5 to 17.5 portions of superfine silver-plated copper powder;
12.5 to 17.5 portions of superfine nickel-coated copper powder.
By adopting the technical scheme, because the semi-conductive adhesive mixture is arranged outside the central conductor, the key material is conductive magnetic agent powder, and the electromagnetic wave radiated to the external environment in the process of transmitting signals by each unit core wire is shielded, the signals transmitted by the adjacent core wires are not interfered with each other due to crosstalk; and because of the application of the conductive magnetic conductive agent powder, the corrugated groove at the outer side of the central conductor is filled with the semi-conductive adhesive mixture, the edge angle of the outer edge conductor is filled, the phenomenon of point discharge of the edge angle at the outer edge of the conductor does not exist any more, and because of the application of various auxiliary organic components of the adhesive mixture, the conductive magnetic conductive agent powder has the functions of long-term stable, uniform dispersion and continuous electric connection, and has the effect of approaching an ideal interface for weak current signal transmission of an electrocardiograph.
Preferably, the outer shielding layer is composed of a first electric field shielding layer and a second magnetic field shielding layer, the first electric field shielding layer wraps around the conductive wire core, and the second magnetic field shielding layer is arranged around the first electric field shielding layer.
By adopting the technical scheme, due to the double-layer cooperative application of the electric field and the magnetic field external shielding layer, electric field components and magnetic field components in various diffused electromagnetic waves in the cable external space environment are doubly shielded, so that the weak current signals of all core wires in the cable are effectively protected from being interfered and damaged by additional factors in the environment.
Preferably, the first electric field shielding layer is formed by spirally and densely winding a silver-plated straight-angle copper wire around a wire core in a counterclockwise direction.
By adopting the technical scheme, as the silver-plated straight-angle copper wire is adopted, the inner surface and the outer surface of the shielding layer form a smooth ideal state similar to a regular cylinder, compared with the unevenness and the cavity of the traditional fine-diameter round conductor lapping shielding and cross-laminated woven shielding, the noise interference caused by irregular reflection of electromagnetic field and electric field components of an external space environment is obviously reduced; and because of the application of the silver-plated straight-angle copper wire, the leakage of the gap of the shielding layer to an electric field is obviously reduced, and the effective shielding rate is improved.
Preferably, the magnetic field second outer shielding layer 42 is formed by tightly winding the electric field first outer shielding layer 41 in a clockwise spiral manner on a soft magnetic amorphous alloy flat wire strip.
Preferably, the soft magnetic amorphous alloy flat angle wire strip is made of iron-nickel based amorphous alloy and comprises the following raw materials in parts by weight: 38-42 parts of nickel, 38-42 parts of iron, 13-15 parts of phosphorus, 5-7 parts of boron, 0.3-0.4 part of rubidium, 0.2-0.3 part of molybdenum and 0.1-0.2 part of vanadium.
By adopting the technical scheme, the soft magnetic amorphous alloy has the best low-frequency magnetic field shielding effect because the soft magnetic amorphous alloy has high magnetic permeability of 8.5-9.5 multiplied by 106 and magnetic induction intensity Bs0.71-0.77T.
Preferably, the soft magnetic amorphous alloy wire strip is prepared by a medium-frequency induction casting furnace through a melt rotating roll quenching method and is formed through mechanical cold drawing.
By adopting the technical scheme, as a melt rotating roller quenching method is adopted, liquid metal is sprayed on a metal single roller or between two rollers rotating at a high speed through a narrow slit, and thin-layer fluid sprayed on the rollers is cooled at a high speed through the heat conduction of the metal rollers, so that an amorphous micro metallographic structure is formed.
Preferably, the surfactant is prepared from the following raw materials in parts by weight: 8-10 parts of polyvinyl alcohol, 6-8 parts of 1, 2-propylene glycol, 6-8 parts of glycerol, 6-8 parts of 1, 2-pentanediol, 4-6 parts of pentaerythritol stearate and 6-8 parts of C60-polyvinylpyrrolidone; the alkali series retention agent is prepared from the following raw materials in parts by weight: 8-10 parts of sodium acetate and 5-7 parts of glacial acetic acid; the solvent is prepared from the following raw materials in parts by weight: 10-15 parts of ethanol and 7-10 parts of acetone.
By adopting the technical scheme, the electromagnetic absorption characteristic of the key shielding material conductive magnetic agent powder is kept in a sharp state instead of being passivated due to time extension due to the adoption of the surfactant; the alkaline maintaining agent is adopted, so that the pH value of the viscose mixture is alkaline and is greater than 7, and the alkaline protection of the surfaces of the metal particles of the central conductor and the conductive magnetic agent powder is facilitated, and the metal particles are not oxidized into metal oxides with insulating property; because the volatile solvent is adopted, the viscose mixture can be quickly dried in a furnace channel and an oven after the surface of the conductor is coated, and the solid semi-conductive shielding layer is formed.
In a second aspect, the application provides a method for preparing an improved electrocardiograph cable, which adopts the following technical scheme:
a preparation method of an improved electrocardiogram instrument cable comprises the following steps:
(1) preparation of the semiconductive viscose mixture: weighing conductive magnetic agent powder, thermoplastic acrylic resin, a surfactant, an alkali series retention agent and a solvent according to the weight part ratio, mixing the materials into a semi-conductive viscose mixture by a homogenizer at normal temperature and normal pressure, and standing the mixture on site for later use;
(2) uniformly coating the semi-conductive adhesive mixture obtained in the step (1) on the surface of a conductor 1, continuously drying in a far infrared pipeline at 90-100 ℃ at a speed of 25-30 m/min, rolling on a special metal wire coil, standing in a far infrared oven at 40-50 ℃ for 12-24 hours, and drying for later use;
(3) coating an insulating layer 3 on a phi 25-45mm plastic extruder at a linear speed of 50-100 m/min to form a conductive wire core semi-finished product of the conductive wire core formed by combining the conductor 1 and the semi-conductive shielding layer 2 which are prepared in the step (2);
(4) wrapping the electric field first outer shielding layer 41 on the periphery of the conductive wire core obtained in the step (3), arranging the magnetic field second outer shielding layer 42 on the outer side of the electric field first shielding layer 41, wherein the electric field first outer shielding layer 41 is formed by spirally and densely winding the silver-plated rectangular copper wire around the wire core in the anticlockwise direction, the winding angle and the axial included angle form 35-45 degrees, the magnetic field second outer shielding layer 42 is formed by spirally and densely winding the soft magnetic amorphous alloy rectangular wire strip around the electric field first outer shielding layer 41 in the clockwise direction, the winding angle and the axial included angle form 35-45 degrees, and further forming the outer shielding layer on the outer side of the conductive wire core;
(5) and (3) coating the medical outer sheath 5 on the cable core with the structure of the external shielding layer 4 prepared in the step (4) on a plastic extruder with the diameter of 50-60mm at the linear speed of 30-50 m/min, and rolling to obtain the improved electrocardiogram instrument cable.
By adopting the technical scheme, the conductor and the semi-conductive adhesive shielding layer material coated on the surface of the conductor are adopted, so that the electrocardiogram instrument cable has the effect of simultaneously shielding the interference of the electric field and the magnetic field generated by each core wire unit on the electrocardio weak signals of adjacent core wires.
Because the silver-plated straight-angle copper wire is spirally wound around the assembled core wire to form the electric field shielding body with the inner surface and the outer surface in a regular, smooth and cylindrical shape and approximate to an ideal interface, the electrocardiogram instrument cable has the efficiency of shielding irregular reflection and interference of electric field components in an electromagnetic field generated by an external space environment on electrocardio weak signals of the core wire; the electrocardiogram instrument cable has the effect of shielding the interference of magnetic field components in an electromagnetic field generated by an external space environment on the electrocardio weak signals of the core wire due to the adoption of the magnetic field shielding layer formed by spirally surrounding the soft magnetic amorphous alloy flat angle wire strip.
The cable is characterized in that the central conductor is twisted anticlockwise, the core wires are gathered clockwise, the first outer shielding layer surrounds anticlockwise, the second outer shielding layer surrounds clockwise, any adjacent layers surround reversely, and are supported, restrained and balanced mechanically, so that a dynamic harmonious relation is presented, the bending resistance, torsion resistance and tensile resistance load of the cable are facilitated when an instrument is used, the performance stability of the cable is guaranteed, the mechanical strength of the cable is improved, and the service life of the cable is prolonged.
In summary, the present application has the following beneficial effects:
1. due to the combined application of the semi-conductive shielding layer and the outer shielding layer, the improved electrocardiogram instrument cable has the shielding effectiveness on the electric field and the magnetic field generated by the adjacent internal conductive wire cores and the double shielding effectiveness on the electric field and the magnetic field generated by various electrical appliances and radio wave random radiation/scattering/reflection in the external space environment;
2. due to the combined application of the silver-plated straight-angle copper wire on the first outer shielding layer of the electric field and the amorphous alloy strip on the second outer shielding layer of the magnetic field, the improved electrocardiogram instrument cable outer shielding layer has an approximately ideal circular interface and fewer structural gaps, and has regular absorption and shielding effects on electromagnetic waves in an external environment;
3. according to the method, the center conductor is twisted anticlockwise, the core wires are gathered clockwise, the first outer shielding layer surrounds anticlockwise, the second outer shielding layer surrounds clockwise, any adjacent layers surround reversely, the mechanical stability of the cable structure is guaranteed, the mechanical performance of the cable is improved, and the service life of the cable is prolonged.
Drawings
FIG. 1 is a schematic cross-sectional view of an improved electrocardiograph cable of the present application.
Reference numerals: 1. a conductor; 2. a semiconductive shield layer; 3. an insulating layer; 4. an outer shield layer; 41. an electric field first shielding layer; 42. a magnetic field second shielding layer; 5. an outer sheath.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples.
Examples of preparation of raw materials and/or intermediates
Preparation example 1
Weighing the following raw materials in parts by weight (kg/part): 9 parts of polyvinyl alcohol, 7 parts of 1, 2-propylene glycol, 7 parts of glycerol, 7 parts of 1, 2-pentanediol, 5 parts of pentaerythritol stearate and 7 parts of C60-polyvinylpyrrolidone, and uniformly mixing in a stirring kettle at the stirring speed of 200rpm for 5min to obtain the surfactant.
Preparation example 2
Weighing the following raw materials in parts by weight (kg/part): 8 parts of polyvinyl alcohol, 8 parts of 1, 2-propylene glycol, 6 parts of glycerol, 8 parts of 1, 2-pentanediol, 4 parts of pentaerythritol stearate and 8 parts of C60-polyvinylpyrrolidone, and uniformly mixing in a stirring kettle at the stirring speed of 200rpm for 5min to obtain the surfactant.
Preparation example 3
Weighing the following raw materials in parts by weight (kg/part): 10 parts of polyvinyl alcohol, 6 parts of 1, 2-propylene glycol, 8 parts of glycerol, 6 parts of 1, 2-pentanediol, 6 parts of pentaerythritol stearate and 6 parts of C60-polyvinylpyrrolidone are uniformly mixed in a stirring kettle at the stirring speed of 200rpm for 5min to obtain the surfactant.
Preparation example 4
Weighing the following raw materials in parts by weight (kg/part): and (3) uniformly mixing 9 parts of sodium acetate and 6 parts of glacial acetic acid in a stirring kettle at the stirring speed of 150rpm for 5min to obtain the alkali series retaining agent.
Preparation example 5
Weighing the following raw materials in parts by weight (kg/part): and 8 parts of sodium acetate and 7 parts of glacial acetic acid are uniformly mixed in a stirring kettle at the stirring speed of 150rpm for 5min to obtain the alkali series retaining agent.
Preparation example 6
Weighing the following raw materials in parts by weight (kg/part): and (3) uniformly mixing 10 parts of sodium acetate and 5 parts of glacial acetic acid in a stirring kettle at the stirring speed of 150rpm for 5min to obtain the alkali series retaining agent.
Preparation example 7
Weighing the following raw materials in parts by weight (kg/part): and (3) uniformly mixing 12.5 parts of ethanol and 8.5 parts of acetone in a stirring kettle at the stirring speed of 50rpm for 5min to obtain the solvent.
Preparation example 8
Weighing the following raw materials in parts by weight (kg/part): and (3) uniformly mixing 10 parts of ethanol and 10 parts of acetone in a stirring kettle at the stirring speed of 50rpm for 5min to obtain the solvent.
Preparation example 9
Weighing the following raw materials in parts by weight (kg/part): and (3) uniformly mixing 15 parts of ethanol and 7 parts of acetone in a stirring kettle at the stirring speed of 50rpm for 5min to obtain the solvent.
Preparation example 10
Weighing the following raw materials in parts by weight (kg/part): 1000 mesh superfine silver-plated copper powder Ag5Cu9512.5 parts and 1000 meshes of superfine nickel-coated copper powder Ni23Cu7717.5 parts of the powder is placed in a double helix cone mixer, and the stirring speed is 80rpm, and the stirring time is 40min, so that the powder of the electric and magnetic conductive agent is obtained.
Preparation example 11
Weighing the following raw materials in parts by weight (kg/part): 1000 mesh superfine silver-plated copper powder Ag5Cu9517.5 parts and 1000 meshes of superfine nickel-coated copper powder Ni23Cu7712.5 parts of the powder is placed in a double helix cone mixer, the stirring speed is 80rpm, and the time is 40min, so that the conductive magnetic conductive agent powder is obtained.
Preparation example 12
Weighing the following raw materials in parts by weight (kg/part): 1000 mesh superfine silver-plated copper powder Ag5Cu9515 parts of superfine nickel-coated copper powder Ni of 1000 meshes23Cu7715 parts of the powder is placed in a double-helix cone mixer, the stirring speed is 80rpm, and the time is 40min, so that the conductive magnetic agent powder is obtained.
Preparation example 13
Weighing the following iron-nickel based amorphous alloy raw materials in parts by weight (kg/part): 38 parts of nickel, 42 parts of iron, 13 parts of phosphorus, 7 parts of boron, 0.35 part of rubidium, 0.25 part of molybdenum and 0.15 part of vanadium, placing the materials in a crucible of a medium-frequency induction melting and casting furnace, preparing the materials by a melt rotating roller quenching method, setting argon atmosphere protection, heating by adopting 1000Hz electromagnetic induction, keeping the melting temperature to 1370 ℃, standing for 10 minutes, keeping the temperature to 1300 ℃ for slagging, then respectively keeping the temperature to 1370 ℃, 1430 ℃, 1450 ℃ and 1470 ℃ for 20 minutes for slagging according to stages, then keeping the temperature at low power for 1450 ℃ to wait for a bottom injection program, carrying out low-temperature slagging every 20 minutes before spraying, and forming a continuous strip by mechanical cold drawing to obtain the amorphous soft magnetic alloy flat angle wire strip with the thickness of 0.04mm and the width of 1.5 mm.
Preparation example 14
Weighing the following iron-nickel based amorphous alloy raw materials in parts by weight (kg/part): 42 parts of nickel, 38 parts of iron, 15 parts of phosphorus, 5 parts of boron, 0.4 part of rubidium, 0.2 part of molybdenum and 0.2 part of vanadium, placing the materials in a crucible of a medium-frequency induction melting and casting furnace, preparing the materials by a melt rotating roller quenching method, setting argon atmosphere protection, heating by adopting 1000Hz electromagnetic induction, keeping the melting temperature to 1370 ℃, standing for 10 minutes, keeping the temperature to 1300 ℃ for slagging, then respectively keeping the temperature to 1370 ℃, 1430 ℃, 1450 ℃ and 1470 ℃ for 20 minutes for slagging according to stages, then keeping the temperature at low power for 1450 ℃ to wait for a bottom injection program, carrying out low-temperature slagging every 20 minutes before spraying, and forming a continuous strip by mechanical cold drawing to obtain the amorphous soft magnetic alloy flat angle wire strip with the thickness of 0.04mm and the width of 1.5 mm.
Preparation example 15
Weighing the following iron-nickel based amorphous alloy raw materials in parts by weight (kg/part): 40 parts of nickel, 40 parts of iron, 14 parts of phosphorus, 6 parts of boron, 0.3 part of rubidium, 0.3 part of molybdenum and 0.1 part of vanadium, placing the materials in a crucible of a medium-frequency induction melting and casting furnace, preparing the materials by a melt rotating roller quenching method, setting argon atmosphere protection, heating by adopting 1000Hz electromagnetic induction, keeping stand for 10 minutes when the melting temperature is increased to 1370 ℃, keeping the temperature and reducing the temperature to 1300 ℃ for slagging, then respectively keeping stand for 20 minutes for slagging when the temperature is increased to 1370 ℃, 1430 ℃, 1450 ℃ and 1470 ℃ according to stages, then keeping the temperature at low power for waiting for a bottom injection program, carrying out low-temperature slagging every 20 minutes before spraying, and forming a continuous strip through mechanical cold drawing to obtain the soft magnetic amorphous alloy flat angle wire strip with the thickness of 0.04mm and the width of 1.5 mm.
Examples
Example 1
An improved electrocardiogram instrument cable comprises a conductor 1, a semi-conductive shielding layer 2, an insulating layer 3, an outer shielding layer 4 and an outer sheath 5 in sequence from inside to outside; wherein, the semi-conductive shielding layer 2 is a semi-conductive adhesive mixture; the conductor 1, the semi-conductive shielding layer 2 and the insulating layer 3 form a conductive wire core, and the conductive wire core is 6 cores. The semiconductive viscose mixture comprises the following components in parts by weight shown in table 1, and the improved electrocardiogram instrument cable specifically comprises the following steps:
(1) preparation of the semiconductive viscose mixture: weighing conductive magnetic agent powder, thermoplastic acrylic resin, a surfactant, an alkali series retention agent and a solvent according to the weight part ratio, mixing the materials into a semi-conductive viscose mixture by a homogenizer at normal temperature and normal pressure, and standing the mixture on site for later use;
(2) uniformly coating the semi-conductive adhesive mixture obtained in the step (1) on the surface of a conductor 1, continuously drying in a 95 ℃ far infrared pipeline at a speed of 27.5 m/min, rolling on a special metal wire coil, standing in a 45 ℃ far infrared oven for 18 hours, and drying for later use;
(3) coating an insulating layer 3 on a phi 35mm plastic extruder at a linear speed of 75 m/min to form a conductive wire core semi-finished product formed by combining the conductor 1 and the semi-conductive shielding layer 2 which are prepared in the step (2);
(4) wrapping the electric field first outer shielding layer 41 on the periphery of the conductive wire core obtained in the step (3), arranging the magnetic field second outer shielding layer 42 on the outer side of the electric field first shielding layer 41, wherein the electric field first outer shielding layer 41 is formed by spirally and densely winding the silver-plated rectangular copper wire around the wire core in the anticlockwise direction, the winding angle and the axial included angle form 40 degrees, the magnetic field second outer shielding layer 42 is formed by spirally and densely winding the soft magnetic amorphous alloy rectangular wire strip around the electric field first outer shielding layer 41 in the clockwise direction, the winding angle and the axial included angle form 40 degrees, and further forming the outer shielding layer on the outer side of the conductive wire core;
(5) and (3) coating the medical outer sheath 5 on the cable core with the structure of the external shielding layer 4 manufactured in the step (4) on a phi 55mm plastic extruder at the linear speed of 40 m/min and rolling to obtain the improved electrocardiogram instrument cable.
Note: the surfactant in the above step is selected from preparation example 1; the alkali-based retention agent is selected from preparation example 4; the solvent was selected from preparation example 7; the powder of the conductive magnetic agent is selected from preparation example 10; the soft magnetic amorphous alloy flat angle wire strip is selected from preparation example 13; the insulating layer is made of FEP (fluorinated ethylene propylene) which is purchased from DuPont 9475 in the United states, and the thickness of the insulating layer is 0.20 mm; the outer sheath is made of medical TPE (thermoplastic elastomer) which is purchased from German Gubao TF6MAA, and the thickness of the outer sheath is 0.76 mm; the conductor is formed by twisting 37 strands of soft copper conductors in a regular arrangement mode in a counterclockwise direction, and the diameter of the conductor is 0.56 mm; the first electric field shielding layer is a silver-plated straight-angle copper wire which is purchased from FCC-S, and has the thickness of 0.04mm and the width of 1.0 mm.
Example 2
An improved electrocardiograph cable is different from the embodiment 1 in that the improved electrocardiograph cable specifically comprises the following steps:
(1) preparation of the semiconductive viscose mixture: weighing conductive magnetic agent powder, thermoplastic acrylic resin, a surfactant, an alkali series retention agent and a solvent according to the weight part ratio, mixing the materials into a semi-conductive viscose mixture by a homogenizer at normal temperature and normal pressure, and standing the mixture on site for later use;
(2) uniformly coating the semi-conductive adhesive mixture obtained in the step (1) on the surface of a conductor 1, continuously drying in a 90 ℃ far infrared pipeline at a speed of 30 m/min, rolling on a special metal wire coil, standing in a 40 ℃ far infrared oven for 24 hours, and drying for later use;
(3) coating an insulating layer 3 on a phi 25mm plastic extruder at a linear speed of 100 m/min to form a conductive wire core semi-finished product formed by combining the conductor 1 and the semi-conductive shielding layer 2 which are prepared in the step (2);
(4) wrapping the electric field first outer shielding layer 41 on the periphery of the conductive wire core obtained in the step (3), arranging the magnetic field second outer shielding layer 42 on the outer side of the electric field first shielding layer 41, wherein the electric field first outer shielding layer 41 is formed by spirally and densely winding the silver-plated rectangular copper wire around the wire core in the anticlockwise direction, the winding angle and the axial included angle form 35 degrees, the magnetic field second outer shielding layer 42 is formed by spirally and densely winding the soft magnetic amorphous alloy rectangular wire strip around the electric field first outer shielding layer 41 in the clockwise direction, the winding angle and the axial included angle form 35 degrees, and further forming the outer shielding layer on the outer side of the conductive wire core;
(5) and (3) coating the medical outer sheath 5 on the cable core with the structure of the external shielding layer 4 manufactured in the step (4) on a phi 50mm plastic extruder at the linear speed of 50 m/min and rolling to obtain the improved electrocardiogram instrument cable.
Example 3
An improved electrocardiograph cable is different from the embodiment 1 in that the improved electrocardiograph cable specifically comprises the following steps:
(1) preparation of the semiconductive viscose mixture: weighing conductive magnetic agent powder, thermoplastic acrylic resin, a surfactant, an alkali series retention agent and a solvent according to the weight part ratio, mixing the materials into a semi-conductive viscose mixture by a homogenizer at normal temperature and normal pressure, and standing the mixture on site for later use;
(2) uniformly coating the semi-conductive adhesive mixture obtained in the step (1) on the surface of a conductor 1, continuously drying in a far infrared pipeline at 100 ℃ at a speed of 25 m/min, rolling on a special metal wire coil, standing in a far infrared oven at 50 ℃ for 12 hours, and drying for later use;
(3) coating an insulating layer 3 on a phi 45mm plastic extruder at a linear speed of 50 m/min to form a conductive wire core semi-finished product formed by combining the conductor 1 and the semi-conductive shielding layer 2 which are prepared in the step (2);
(4) wrapping the electric field first outer shielding layer 41 on the periphery of the conductive wire core obtained in the step (3), arranging the magnetic field second outer shielding layer 42 on the outer side of the electric field first shielding layer 41, wherein the electric field first outer shielding layer 41 is formed by spirally and densely winding the silver-plated rectangular copper wire around the wire core in the anticlockwise direction, the winding angle and the axial included angle form 45 degrees, the magnetic field second outer shielding layer 42 is formed by spirally and densely winding the soft magnetic amorphous alloy rectangular wire strip around the electric field first outer shielding layer 41 in the clockwise direction, the winding angle and the axial included angle form 45 degrees, and further forming the outer shielding layer on the outer side of the conductive wire core;
(5) and (3) coating the medical outer sheath 5 on the cable core with the structure of the external shielding layer 4 prepared in the step (4) on a plastic extruder with the diameter of 60mm at the linear speed of 30 m/min, and rolling to obtain the improved electrocardiogram instrument cable.
Examples 4 to 5
An improved electrocardiograph cable is different from the cable in example 1 in that the components of the semiconductive adhesive mixture and the corresponding parts by weight are shown in table 1.
Table 1 the components and parts by weight (kg) of the semiconductive adhesive mixtures of examples 1-5
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Conductive magnetic conductive agent powder | 30 | 30 | 30 | 25 | 35 |
| Thermoplastic acrylic resin | 9 | 9 | 9 | 8 | 10 |
| Surface |
42 | 42 | 42 | 36 | 48 |
| Alkali-based retention agent | 15 | 15 | 15 | 13 | 17 |
| Solvent(s) | 21 | 21 | 21 | 17 | 25 |
Example 6
An improved electrocardiograph cable, which is different from example 1 in that the surfactant in the above step is selected from preparation example 2.
Example 7
An improved electrocardiograph cable, which is different from example 1 in that the surfactant in the above step is selected from preparation example 3.
Example 8
An improved electrocardiograph cable which is different from example 1 in that the alkali-based retention agent in the above step is selected from preparation example 5.
Example 9
An improved electrocardiograph cable which is different from example 1 in that the alkali-based retention agent in the above step is selected from preparation example 6.
Example 10
An improved electrocardiograph cable, differing from example 1 in that the solvent in the above step is selected from preparation example 8.
Example 11
An improved electrocardiograph cable, which is different from example 1 in that the solvent in the above step is selected from preparation example 9.
Example 12
An improved electrocardiograph cable, which is different from the embodiment 1 in that the conductive magnetic agent powder in the above steps is selected from the preparation example 11.
Example 13
An improved electrocardiograph cable, which is different from the embodiment 1 in that the conductive magnetic agent powder in the above steps is selected from preparation example 12.
Example 14
An improved electrocardiograph cable, which is different from example 1 in that the soft magnetic amorphous alloy flat angle wire ribbon in the above step is selected from preparation example 14.
Example 15
An improved electrocardiograph cable differing from example 1 in that the soft magnetic amorphous alloy flat angle wire ribbon in the above step is selected from preparation example 15.
Comparative example
Comparative example 1
The difference between the improved electrocardiogram instrument cable and the embodiment 1 is that in the steps, the conductive magnetic conductive agent powder does not contain ultrafine silver-plated copper powder Ag5Cu95。
Comparative example 2
An improved electrocardiogram instrument cable is different from the cable in the embodiment 1 in that in the step, the conductive magnetic conductive agent powder does not contain superfine nickel-coated copper powder Ni23Cu77。
Comparative example 3
An improved electrocardiogram instrument cable is different from the embodiment 1 in that the semi-conductive adhesive mixture in the above steps does not contain conductive magnetic permeability agent powder.
Comparative example 4
An improved electrocardiograph cable, which is different from embodiment 1 in that the outer shielding layer only comprises a first outer shielding layer, and the step (4) is specifically configured as follows: wrap up the electric field first outer shielding layer in the electric core week side that step (3) obtained, the electric field first outer shielding layer 41 is that silver-plated straight angle copper line is formed according to the close winding sinle silk of anticlockwise spiral, encircles the angle and becomes 40 with axial contained angle, and then forms outer shielding layer in the electric core outside.
Comparative example 5
An improved electrocardiograph cable, which is different from embodiment 1 in that the outer shielding layer only comprises a magnetic field second outer shielding layer, and the step (4) is specifically configured as follows: and (3) wrapping the electric field and magnetic field second outer shielding layer on the periphery of the conductive wire core obtained in the step (3), wherein the magnetic field second outer shielding layer is formed by tightly winding the wire core according to a clockwise spiral for the soft magnetic amorphous alloy flat angle wire strip, the winding angle and the axial included angle form 40 degrees, and then the outer shielding layer is formed on the outer side of the conductive wire core.
Comparative example 6
An improved electrocardiogram instrument cable is different from the embodiment 1 in that the improved electrocardiogram instrument cable sequentially comprises a conductor 1, a semi-conductive shielding layer 2, an insulating layer 3 and an outer sheath 5 from inside to outside; wherein, the semi-conductive shielding layer 2 is a semi-conductive adhesive mixture; the conductor 1, the semi-conductive shielding layer 2 and the insulating layer 3 form a conductive wire core, and the contained conductive wire core is a 7-core.
Performance testing test samples: the modified electrocardiograph cables obtained in examples 1 to 16 were used as test samples 1 to 16, and the modified electrocardiograph cables obtained in comparative examples 1 to 6 were used as control samples 1 to 6.
The test method comprises the following steps:
(1) cable crosstalk attenuation test: refer to pages P524-528 of chapter 3 test of electrical properties of communication cables, chapter 3, handbook of electric wires and cables, edited by wangchunjiang, beijing: mechanical industry Press 2014.4
Test equipment: firstly, a crosstalk attenuation tester DP-TS 5111; ② electrocardiograph CF type
Test frequency: 50Hz (10m)
(2) And (3) cable shielding effectiveness test: see chapter 4, Performance test, of electric wire and Cable handbook 1, chapter 5, of the King Chunjiang
P1005-1006, beijing: mechanical industry Press 2014.4
Test equipment: firstly, a cable shielding coefficient tester JDP-30; ② electrocardiograph CF type
Test frequency: 50Hz (10 m).
The test result shows that the comparison among the test samples 1-16 shows that the powder of the conductive magnetic permeability agent in the preparation example 10 can obtain better inner shielding performance, and the soft magnetic amorphous alloy flat angle wire strip in the preparation example 15 can obtain better outer shielding performance. The test results of the test sample 1 and the comparison samples 1-3 are compared to obtain the composite cable, and the signal distortion degree of the cable can be greatly reduced by using the superfine silver-plated copper powder and the superfine nickel-coated copper powder in a compounding way. The comparison of the test results of the test sample 1 and the comparison samples 4-6 can be obtained, and the combination of the first outer shielding layer of the electric field and the second outer shielding layer of the magnetic field can greatly improve the overall quality of the cable.
TABLE 2 test results of test samples 1-16 and control samples 1-6
Note:
IL: internal noise/. mu.V
ATT: attenuation/dB
ACR: cross-talk attenuation ratio (signal-to-noise ratio)/dB
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (7)
1. An improved electrocardiogram instrument cable is characterized by sequentially comprising a conductor (1), a semi-conductive shielding layer (2), an insulating layer (3), an outer shielding layer (4) and an outer sheath (5) from inside to outside; the semi-conductive shielding layer (2) is a semi-conductive viscose mixture; the conductor (1), the semi-conductive shielding layer (2) and the insulating layer (3) form a conductive wire core, and the conductive wire core contained in the conductive wire core is at least a single core and at most 50 cores;
the semiconductive viscose mixture is prepared from the following raw materials in parts by weight:
25-35 parts of conductive magnetic agent powder;
8-10 parts of thermoplastic acrylic resin;
36-48 parts of a surfactant;
13-17 parts of an alkali series retaining agent;
17-25 parts of a solvent;
the conductive magnetic agent powder is prepared by uniformly mixing the following raw materials in parts by weight:
12.5 to 17.5 portions of superfine silver-plated copper powder;
12.5-17.5 parts of superfine nickel-coated copper powder;
the surfactant is prepared from the following raw materials in parts by weight: 8-10 parts of polyvinyl alcohol, 6-8 parts of 1, 2-propylene glycol, 6-8 parts of glycerol, 6-8 parts of 1, 2-pentanediol, 4-6 parts of pentaerythritol stearate and 6-8 parts of C60-polyvinylpyrrolidone; the alkali series retention agent is prepared from the following raw materials in parts by weight: 8-10 parts of sodium acetate and 5-7 parts of glacial acetic acid; the solvent is prepared from the following raw materials in parts by weight: 10-15 parts of ethanol and 7-10 parts of acetone.
2. The improved electrocardiograph cable of claim 1 wherein: outer shielding layer (4) comprise the outer shielding layer (42) of the first outer shielding layer (41) of electric field and magnetic field second, and electric field first outer shielding layer (41) parcel electric wire core week side, and magnetic field second outer shielding layer (42) set up in the first shielding layer (41) outside of electric field.
3. The improved electrocardiograph cable of claim 2 wherein: the first outer shielding layer (41) of the electric field is formed by spirally and densely winding a silver-plated straight-angle copper wire around a wire core in a counterclockwise direction.
4. The improved electrocardiograph cable of claim 2 wherein: the second outer shielding layer (42) of the magnetic field is formed by tightly winding the first outer shielding layer (41) of the electric field in a clockwise spiral mode on a soft magnetic amorphous alloy flat angle line strip.
5. The improved electrocardiograph cable according to claim 4, wherein: the soft magnetic amorphous alloy flat angle line strip is made of iron-nickel based amorphous alloy and comprises the following raw materials in parts by weight: 38-42 parts of nickel, 38-42 parts of iron, 13-15 parts of phosphorus, 5-7 parts of boron, 0.3-0.4 part of rubidium, 0.2-0.3 part of molybdenum and 0.1-0.2 part of vanadium.
6. The improved electrocardiograph cable according to claim 5, wherein: the soft magnetic amorphous alloy flat angle line strip is prepared by a medium frequency induction melting and casting furnace through a melt rotating roll quenching method and is mechanically cold drawn to form a continuous strip.
7. The process for preparing an improved electrocardiograph cable according to any one of claims 1 to 6, comprising the steps of:
(1) preparation of the semiconductive viscose mixture: weighing conductive magnetic agent powder, thermoplastic acrylic resin, a surfactant, an alkali series retention agent and a solvent according to the weight part ratio, mixing the materials into a semi-conductive viscose mixture by a homogenizer at normal temperature and normal pressure, and standing the mixture on site for later use;
(2) uniformly coating the semi-conductive adhesive mixture obtained in the step (1) on the surface of a conductor (1), continuously drying in a far infrared pipeline at 90-100 ℃ at a speed of 25-30 m/min, rolling on a special metal wire coil, standing in a far infrared oven at 40-50 ℃ for 12-24 hours, and drying for later use;
(3) coating an insulating layer (3) on a phi 25-45mm plastic extruder at a linear speed of 50-100 m/min to form a conductive wire core semi-finished product of a conductive wire core formed by combining the conductor (1) prepared in the step (2) and the semi-conductive shielding layer (2);
(4) wrapping the electric field first outer shielding layer (41) on the periphery of the conductive wire core obtained in the step (3), arranging the magnetic field second outer shielding layer (42) on the outer side of the electric field first shielding layer (41), wherein the electric field first outer shielding layer (41) is formed by spirally and densely winding a silver-plated flat angle copper wire around the wire core in the anticlockwise direction, the winding angle and the axial included angle form 35-45 degrees, the magnetic field second outer shielding layer (42) is formed by spirally and densely winding a soft magnetic amorphous alloy flat angle wire strip around the electric field first outer shielding layer (41) in the clockwise direction, the winding angle and the axial included angle form 35-45 degrees, and further forming the outer shielding layer on the outer side of the conductive wire core;
(5) and (3) coating the outer sheath (5) on the cable core with the structure of the outer shielding layer (4) manufactured in the step (4) on a plastic extruder with the diameter of 50-60mm at the linear speed of 30-50 m/min and rolling to obtain the improved electrocardiogram instrument cable.
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| CN202011570651.6A CN112750560B (en) | 2020-12-26 | 2020-12-26 | Improved electrocardiogram instrument cable and preparation method thereof |
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|---|---|---|---|---|
| FR2330128A1 (en) * | 1975-10-29 | 1977-05-27 | Daetwyler Ag | Semiconducting screen for plastics-insulated cables - is a fused-on (co)polymer coating contg. conductive filler |
| CN101887771A (en) * | 2010-05-05 | 2010-11-17 | 深圳市联嘉祥科技股份有限公司 | Semiconductive EVA plastic shielded flexible cable and manufacturing method thereof |
| CN204632382U (en) * | 2015-05-27 | 2015-09-09 | 东莞市万丰科技有限公司 | Medical cable |
| CN106205841A (en) * | 2016-06-29 | 2016-12-07 | 戴亮祥 | A kind of high voltage power cable |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2330128A1 (en) * | 1975-10-29 | 1977-05-27 | Daetwyler Ag | Semiconducting screen for plastics-insulated cables - is a fused-on (co)polymer coating contg. conductive filler |
| CN101887771A (en) * | 2010-05-05 | 2010-11-17 | 深圳市联嘉祥科技股份有限公司 | Semiconductive EVA plastic shielded flexible cable and manufacturing method thereof |
| CN204632382U (en) * | 2015-05-27 | 2015-09-09 | 东莞市万丰科技有限公司 | Medical cable |
| CN106205841A (en) * | 2016-06-29 | 2016-12-07 | 戴亮祥 | A kind of high voltage power cable |
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Denomination of invention: An improved electrocardiograph cable and its preparation method Effective date of registration: 20220627 Granted publication date: 20220513 Pledgee: Shanghai Rural Commercial Bank Co.,Ltd. Jinshan sub branch Pledgor: Shanghai Guqian intelligent transmission Co.,Ltd. Registration number: Y2022310000092 |