CN106711634B - Connection method of compression-resistant coaxial cable with improved shielding effect - Google Patents
Connection method of compression-resistant coaxial cable with improved shielding effect Download PDFInfo
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- CN106711634B CN106711634B CN201611249201.0A CN201611249201A CN106711634B CN 106711634 B CN106711634 B CN 106711634B CN 201611249201 A CN201611249201 A CN 201611249201A CN 106711634 B CN106711634 B CN 106711634B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
- H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
- H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
- H01R9/0518—Connection to outer conductor by crimping or by crimping ferrule
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding
- H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
- H01R13/6591—Specific features or arrangements of connection of shield to conductive members
- H01R13/6592—Specific features or arrangements of connection of shield to conductive members the conductive member being a shielded cable
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
- H01R4/18—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
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Abstract
The invention discloses a connecting method of a pressure-resistant coaxial cable for improving a shielding effect. The invention relates to the technical field of coaxial cable connection, in particular to a connection method of a compression-resistant coaxial cable for improving a shielding effect. The cable body is tightly connected with the connector through the metal sleeve with the elastic rubber sleeve, the cable is suitable for being used in an environment with strong vibration impact, the compression joint strength is high, the tensile strength is good, the radial section of the metal sleeve is regular hexagon, no flash is formed after compression joint, the injection molding thickness of the injection molding layer is protected to be uniform, the shielding effect on the connector is good, the shielding performance of the coaxial cable is improved, the cable is ensured to be in the center of the connector after being installed, point discharge can be effectively eliminated, stress is distributed more uniformly, the effect of a voltage-sharing ring can be achieved, the electric field at the joint is uniformly distributed to the surrounding grounding area, the occurrence of corona discharge is avoided, and any damage to the cable and a machine is avoided.
Description
Technical Field
The invention relates to the technical field of coaxial cable connection, in particular to a connection method of a compression-resistant coaxial cable for improving a shielding effect.
Background
As one of important components for transmitting high-frequency electric signals, coaxial cables are widely used as signal transmission lines between base station transmitters, receivers, radio communication devices, or in the high-frequency field of systems such as radio communication, microwave transmission, and broadcast communication, because of their excellent characteristics such as low high-frequency loss, high shielding and anti-interference capabilities, and wide frequency band. Because copper has good electrical, mechanical and thermal properties, coaxial cables widely used in the mobile communications industry are essentially copper. Copper coaxial cables are heavier and therefore have higher requirements for mounting and fixing the cables. Particularly, for projects with large requirements for popularizing cables, for example, for popularizing Code Division Multiple Access (TD-SCDMA) base stations of Time Division synchronization of third Generation Mobile communication System (3 rd Generation Mobile Communications System,3 g), requirements for cables are increased by 9 times compared with Global System for Mobile Communications (GSM) base stations, and meanwhile, higher requirements for fixing and installing cables are provided, which requires how to optimize product structures without reducing electrical performance of coaxial cables.
The traditional coaxial cable has the problems of high production cost, low production efficiency, difficulty in meeting higher technical requirements and the like due to the defects of material selection, production process and the like, and particularly has single product performance, such as the improvement of comprehensive mechanical performance is limited to meet excellent electrical performance; in order to meet the requirements of light weight and pressure resistance, the transmission performance of the cable is often reduced; in order to exhibit good return loss performance and waterproof performance, the mechanical strength of the cable is often reduced.
The coaxial cable widely used in the satellite antenna television generally comprises an inner core wire, an insulating foaming layer outside the inner core wire, an aluminum foil layer outside the insulating foaming layer, a braided layer outside the aluminum foil layer and a sheath layer outside the braided layer. In the prior art, two similar coaxial cable connector structures are disclosed in two utility model patents with application numbers of CN2013205650666 and CN2013205662678 respectively, when a worker connects a coaxial cable with the connector, one section of the aluminum foil layer, the weaving layer and the outer sheath layer of the coaxial cable needs to be cut off, the aluminum foil layer is exposed, the shorter section of the foaming layer is cut off, the inner core wire is exposed, the exposed foaming layer and the inner conductor are inserted into the connector from the rear end of the connector, so that the foaming layer penetrates into the connector, and then the connector and the cable joint are compressed tightly. However, the connecting method has poor tensile capability, and is very easy to be torn off under the environment with strong vibration impact, so that the cable is disconnected, and the normal use is influenced; and need the manual work to cut one section with coaxial cable's weaving layer and oversheath layer, expose the aluminium foil layer, weaving layer and aluminium foil layer are difficult to be dialled out, and it is hard to waste time and energy when carrying out the connector installation, even probably damage the connector, more importantly, because of cutting shielding layer and outer protective sheath back, produced the gap at the insulating layer of cable and the junction of connector, so have the electromagnetism leakage phenomenon, shielding efficiency reduces.
Disclosure of Invention
The invention aims to provide a connection method of a compression-resistant coaxial cable with an improved shielding effect, wherein the coaxial cable is convenient to install, high in mechanical strength, good in compression-resistant effect and excellent in shielding performance.
In order to solve the technical problems, the invention provides the following technical scheme:
a connection method of a pressure-resistant coaxial cable with improved shielding effect comprises a cable body and a connector arranged at the tail end of the cable body, wherein the cable body is in compression connection with the connector through a metal sleeve, the metal sleeve consists of an elastic rubber sleeve and a metal pipe fixedly crimped outside the elastic rubber sleeve, and the connection method comprises the following steps:
s1: stripping a sheath layer at the access end of the cable body to expose the shielding layer, and brushing a braid layer of the shielding layer by using a reverse brushing device;
s2: sleeving a metal sleeve on the access end of the cable body with the sheath layer stripped off, and turning back and uniformly attaching the shielding layer to the outer wall of the metal sleeve;
s3: cutting off the polyethylene insulating layer to expose the inner conductor of the cable, and welding the inner conductor with the center pin;
s4: the connector and the access end of the coaxial cable body are connected in a sliding-in type mode in a mode that the center of the connector is opposite to the center needle, and the connector and the cable body are ensured to be on the same axis;
s5: trimming the redundant shielding layer at the joint of the tail part of the access end of the cable body and the metal copper pipe, selecting a proper stamping jig to press the metal sleeve into a specific shape, and tightly pressing the shielding layer of the cable body, the metal sleeve and the connector;
s6: the cable body, the metal sleeve and the connector are subjected to integral injection molding, and the compression-resistant coaxial cable with the shielding effect improved is obtained;
s7: and testing whether the performance of the coaxial cable after injection molding meets the requirements.
Preferably, the elastic rubber sleeve is made of silica gel, the metal pipe is a copper pipe, the inner conductor, the insulating layer and the shielding layer are not extruded, after the insulating layer and the shielding layer are trimmed, the insulating layer is cut neatly, the surface of the insulating layer is free of metal chips and other pollution, and the shielding layer is cut neatly, free of burrs and free of rolling.
Preferably, the welding of the inner conductor and the central needle is full and reliable, and no cavity exceeding 1/6 of the wire diameter is formed at the joint of the shielding layer, the metal sleeve and the connector through X-ray inspection.
Preferably, the cable body comprises an inner conductor, a polyethylene insulating layer, two layers of aluminum foils and a metal shielding layer, and a sheath layer, wherein the inner conductor is sequentially coated from inside to outside in the radial direction; the polyethylene is foaming cross-linked polyethylene or irradiation solid polyethylene; the inner conductor is a copper core or a tinned copper core or a silvered copper core; the connector comprises a cylindrical outer conductor, a central needle is arranged in the outer conductor, a jack extends out of the outer part of the central needle and the rear end of the connector, the outer diameter of the jack is smaller than the inner diameter of the metal sleeve, and an insulator is arranged between the central needle and the outer conductor.
Preferably, the shielding layer comprises a single-sided hot-melt aluminum foil layer, an alloy wire woven layer and a non-adhesive two-sided aluminum foil layer which are sequentially coated from inside to outside, and the single-sided hot-melt aluminum foil layer and the non-adhesive two-sided aluminum foil layer are fixed on the cable body in a corrugated shape; and a second woven layer is further arranged outside the non-bonding type two-sided aluminum foil layer and is a tin-dipped woven layer.
Preferably, the outer diameter of the jack in the connector is 5.00-5.05 mm, the inner diameter of the metal sleeve is 6.35-6.40 mm, and the thickness of the elastic rubber sleeve in the metal sleeve is 0.50-1.00mm.
Preferably, the metal sleeve and the outer surface of the cable body form six faces through riveting and pressing a hexagon, each face is concave to form an arc face, and the radial section of the metal sleeve is a regular hexagon.
Preferably, the reverse brush device comprises a rotating shaft and a brush head arranged at the upper end of the rotating shaft, the brush head comprises brush needles, the brush needles are arranged along the outer surface of the brush head and are arranged into a vertical group, an inclined group or a horizontal group, and the brush needles can be drawn out of the brush head body to facilitate replacement.
Preferably, cable body fixed mounting is in the inside of connector jack, and the inner conductor plug bush parallel card of cable body is put in central needle, the junction of central needle and outer conductor is equipped with the flexure strip that has radial elasticity that is used for fixed inner conductor, the flexure strip comprises the elastic strip of circle shape flexure strip limit on two coaxial lines and a plurality of connection between two flexure strip limits, the flexure strip is not closed, and flexure strip lateral wall department is equipped with the opening, 360 encircles of outer conductor inner wall are equipped with the recess, the flexure strip is whole and groove shape looks adaptations, the flexure strip plug bush parallel card is put in the recess.
Preferably, the outer conductor is a turned part, the insulator and the outer conductor are tightly matched by punching points on the outer conductor, and the insulator is provided with a plurality of axial through holes with the same size and shape.
Compared with the prior art, the invention has the advantages that: 1. the cable body is tightly connected with the connector through the metal sleeve with the elastic rubber sleeve, the cable is suitable for being used in an environment with strong vibration impact, the compression joint strength is high, the tensile strength is good, the radial section of the metal sleeve is regular hexagon, the outer surface of the metal sleeve is concave into a cambered surface, after the metal sleeve is compressed with the access end of the coaxial cable, the outer surface of the connecting end of the metal sleeve is regular in shape and free of flash formation, the injection molding thickness of the injection molding layer is uniform, the shielding effect on the connector is good, and the shielding performance of the coaxial cable is improved; 2. the coaxial annular metal sleeve also ensures that the cable is arranged in the center of the connector after being installed, the local electric field is not over-strong due to uneven electric field distribution, point discharge can be effectively eliminated, stress is more uniformly distributed, the cable is arranged in the center of the electric connector after being installed, and the effect of a grading ring can be realized, so that the electric field at the joint is uniformly distributed to the surrounding grounding area, the occurrence of corona discharge is avoided, and the cable and a machine cannot be damaged; 3. the shielding layer adopts a comprehensive structure of a single-side hot-melt aluminum foil layer, a high-quality alloy wire braid layer and non-adhesive aluminum foil layers on two sides accumulated layer by layer, so that the flexible bending-resistant requirement of the cable is met, and the shielding performance is further improved; 4. the outer conductor of the connector is machined by turning, the wall thickness of the outer conductor is not provided with a groove, electromagnetic leakage is reduced, an elastic sheet with radial elasticity for fixing the inner conductor is arranged at the joint of the central needle and the outer conductor so as to increase the electric contact of the connector to the timing outer conductor, the electric signal transmission is stable, and the insulator is provided with a plurality of through holes so as to reduce the mixed dielectric constant of the insulator, so that the transmission performance of the cable is optimized.
In conclusion, the novel structure of the coaxial cable ensures the flexibility, bending resistance and compression resistance of the coaxial cable, improves the shielding performance of the cable, and the shielding attenuation of the coaxial cable can reach more than 85 dB within the frequency range of 1.0 MHZ-2000.0 MHZ; the transmission efficiency is improved while the shielding performance of the coaxial cable is greatly improved and the transmission efficiency is improved when the transmission efficiency is improved to 100 MHZ-200 MHZ is more than 105 dB which is higher than 95 dB in the prior art, the transmission efficiency accords with the European standard, the quality of high-frequency signals transmitted in the coaxial cable can be fully ensured not to be influenced, and the transfer impedance of the coaxial cable is reduced and is less than or equal to 5.0 mohm/m between 1.0 MHz and 2000.0 MHz.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a joining process according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of an explosive structure according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a connector according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a connector spring according to an embodiment of the invention;
FIG. 6 is a schematic view of the structure of a connector insulator according to an embodiment of the present invention;
FIG. 7 is a schematic side view of a connector according to an embodiment of the present invention;
FIG. 8 is a cross-sectional view of the metal sleeve assembled with a coaxial cable body and connector in accordance with an embodiment of the present invention;
FIG. 9 is a schematic structural view of a reverse brushing device according to an embodiment of the present invention;
FIG. 10 is a test plot of transfer impedance and shield attenuation versus frequency for a prior art regular hexagonal cross-section coaxial cable;
fig. 11 is a test chart of the transfer impedance and the shielding attenuation of the coaxial cable with the regular hexagonal cross section according to the embodiment of the present invention as a function of frequency;
FIG. 12 is a graph of the transfer impedance and shield attenuation versus frequency for a prior art circular cross-section coaxial cable;
FIG. 13 is a graph of the transfer impedance and shield attenuation of a circular cross-section coaxial cable in accordance with an embodiment of the present invention as measured by frequency;
FIG. 14 is a test chart of the transfer impedance and shield attenuation of a prior art irregular cross-section coaxial cable as a function of frequency;
fig. 15 is a test chart of the transfer impedance and the shielding attenuation of the coaxial cable with the irregular cross section according to the embodiment of the present invention.
Detailed Description
The invention discloses a connecting method of a pressure-resistant coaxial cable for improving a shielding effect.
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the description is only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A connection method of a pressure-resistant coaxial cable with improved shielding effect is provided, the coaxial cable comprises a cable body and a connector arranged at the tail end of the cable body, the cable body is in compression connection with the connector through a metal sleeve, the metal sleeve is composed of an elastic rubber sleeve and a metal pipe fixedly crimped outside the elastic rubber sleeve, as shown in figure 1, the connection method comprises the following steps:
the method comprises the following steps that firstly, a sheath layer at an access end of a cable body is stripped to expose a shielding layer, a braid layer of the shielding layer is brushed to be stripped by using a reverse brushing device, a metal sleeve is sleeved on the access end of the cable body with the sheath layer stripped, and the shielding layer is turned backwards and is uniformly attached to the outer wall of the metal sleeve;
secondly, cutting off the polyethylene insulating layer to expose the inner conductor of the cable, and welding the inner conductor with the center pin;
thirdly, the connector and the access end of the coaxial cable body are connected in a sliding mode in a mode that the center of the connector is opposite to the center needle, and the connector and the cable body are ensured to be on the same axis;
fourthly, trimming the redundant turned shielding layer at the joint of the tail part of the access end of the cable body and the metal copper pipe, pressing the metal sleeve into a specific shape by selecting a proper stamping jig, and tightly pressing the shielding layer of the cable body, the metal sleeve and the connector;
and finally, performing integral injection molding on the cable body, the metal sleeve and the connector, and testing whether the performance of the coaxial cable subjected to injection molding meets the requirement.
Preferably, the elastic rubber sleeve is made of silica gel, the metal pipe is a copper pipe, the inner conductor, the insulating layer and the shielding layer are not extruded, after the insulating layer and the shielding layer are trimmed, the insulating layer is cut neatly, the surface of the insulating layer is free of metal chips and other pollution, and the shielding layer is cut neatly, free of burrs and free of rolling.
Preferably, the welding of the inner conductor and the central needle is full and reliable, and no cavity exceeding 1/6 of the wire diameter is formed at the joint of the shielding layer, the metal sleeve and the connector through X-ray inspection.
Preferably, as shown in fig. 9, the reverse brush device comprises a rotating shaft 60 and a brush head 62 arranged at the upper end of the rotating shaft 60, the brush head 62 comprises brush needles 61, the brush needles 61 are arranged along the outer surface of the brush head 62, the brush needles 61 are arranged in a vertical group, an inclined group or a horizontal group, and the brush needles 61 can be extracted from the body of the brush head 62 for convenient replacement.
Correspondingly, the invention also discloses the compression-resistant coaxial cable with the improved shielding effect, which is manufactured by the connection method of the compression-resistant coaxial cable with the improved shielding effect.
Referring to fig. 2 to 8, a compression-resistant coaxial cable with improved shielding effect comprises a cable body 11 and a connector 22 arranged at the end of the cable body 11, wherein the cable body 11 is connected with the connector 22 by a coaxial annular metal sleeve 33 in a compression manner, and the metal sleeve 33 is composed of an elastic rubber sleeve 31 and a metal tube 32 fixedly crimped outside the elastic rubber sleeve 31; the cable body 11 comprises an inner conductor 10, a polyethylene insulating layer 11, two layers of aluminum foils and metal shielding layers and a sheath layer 16, wherein the inner conductor 10 is sequentially coated from inside to outside in the radial direction; the polyethylene is foaming cross-linked polyethylene or irradiation cross-linked polyethylene; the shielding layer comprises a single-sided hot-melt aluminum foil layer 12, an alloy wire woven layer 13, a non-adhesive double-sided aluminum foil layer 14 and a second woven layer 15 which are sequentially coated from inside to outside, the second woven layer 15 is a tin-dipped woven layer, and the single-sided hot-melt aluminum foil layer 12 and the non-adhesive double-sided aluminum foil layer 14 are fixed on the cable body 11 in a corrugated shape; the connector 22 comprises a cylindrical outer conductor 21, a central needle 22 is arranged in the outer conductor 21, a jack extends out of the central needle 22 and the rear end of the connector 22, an insulator 23 is arranged between the central needle 22 and the outer conductor 21, and a plurality of axial through holes 231 with the same size and shape are arranged on the insulator 23; when the connector 22 is assembled and fixed with the cable body 11, the shielding layer at the front end of the cable body 11 is inserted between the inner wall of the metal sleeve 33 and the outer wall of the jack, the insulating layer 11 and the inner conductor 10 at the front end of the cable body 11 are inserted inside the jack, and the front end part of the inner conductor 10 is exposed out of the front end of the metal sleeve 33; the cable body 11 is fixedly arranged in the jack of the connector 22, the inner conductor 10 of the cable body 11 is inserted and clamped in the central needle 22, and the joint of the central needle 22 and the outer conductor 21 is provided with an elastic sheet 50 with radial elasticity for fixing the inner conductor 10; the elastic piece 50 is composed of two ring-shaped elastic piece edges 51 on the same axis and a plurality of elastic strips 52 connected between the two elastic piece edges 51, the elastic piece 50 is not closed, and an opening is arranged at the side wall of the elastic piece 50; a groove 41 is formed in the inner wall of the outer conductor 21 in a 360-degree surrounding manner, the shape of the elastic sheet 50 is integrally matched with that of the groove 41, and the elastic sheet 50 is inserted into the groove 41 in a sleeved and clamped manner; the metal sleeve 33 and the outer surface of the cable body 11 form six surfaces through riveting hexagonal pressing, each surface is concave to form an arc surface, and the radial section of the metal sleeve 33 is a regular hexagon.
Although the radial cross section of the metal sleeve 33 is described as a regular hexagon, and the structure of the shielding layer is described as a structure of two aluminum foil layers and two braided layers sandwiched therebetween for enhancing the flexibility of the coaxial cable, it should be understood by those skilled in the art that the radial cross section of the metal sleeve 33 may have other shapes, for example, a regular shape such as a circle, an ellipse, a triangle, a rectangle, etc., or an irregular shape; the shielding layer may have only one aluminum foil layer and one braid layer, and all that is required to implement the present invention is within the scope of the present invention.
Preferably, the elastic rubber sleeve 31 is made of silica gel, and when the metal sleeve 33 and the coaxial cable body 11 are crimped, the elastic rubber sleeve 31 can be contracted to enable the metal sleeve 33 to abut against the outside of the folded shielding layer, so that the coaxial connector 22 or a machine is prevented from being damaged due to uneven stress distribution; the metal tube 32 is a copper tube, and copper metal has small resistance, good ductility and is suitable for stamping.
Preferably, the outer conductor 21 is a lathed part, which increases the metal thickness compared with the drawn outer conductor 21, and has no gap left after grooving because of the need of having a certain elasticity, and the punching point on the outer conductor 21 tightly fits the insulator 23 and the outer conductor 21, thereby having high electromagnetic shielding performance. The outer conductor 21, the central needle 22 and the elastic sheet 50 are provided with a metal plating layer which can be nickel plating or gold plating, and the corrosion resistance is good. The elastic sheet 50 can be integrally formed and made of beryllium copper, and the manufacturing process is tempered at 600 ℃, so that the elastic sheet still has a good resilience effect after repeated plugging and unplugging.
Preferably, the inner conductor 10 is a copper core, a tin-plated copper core, or a silver-plated copper core, but other metal inner conductors 10 may be used. The good electrical, mechanical and thermal properties of copper can be utilized to more rapidly transmit energy and information, and the tin-plated copper core or the silver-plated copper core is adopted, so that the cost of raw materials is reduced compared with the common cost while the stability of the inner conductor 10 of the coaxial cable is effectively ensured. The cost of the coaxial cable can also be effectively reduced when a metal or metal alloy having a density less than copper is selected and less expensive than copper.
Preferably, the outer diameter of the insertion hole 24 in the connector 222 is 5.00-5.05 mm, the inner diameter of the metal sleeve 33 is 6.35-6.40 mm, and the thickness of the elastic rubber sleeve 31 in the metal sleeve 33 is 0.50-1.00mm, so as to adapt to the thickness of the shielding layer, thereby increasing or decreasing the gap between the metal sleeve 33 and the shielding layer as required and adjusting the punching force.
When the coaxial cable is installed, the sheath layer 16 at the access end of the cable body 1 is stripped, the shielding layer is exposed, the braid layer of the shielding layer is brushed away by using a reverse brushing device, the metal sleeve 3 is sleeved on the access end of the cable body 1 with the sheath layer 16 stripped, the exposed shielding layer is turned backwards and uniformly attached to the outer wall of the metal sleeve 3, the exposed polyethylene insulating layer 11 of the cable body 1 is cut off, the cable inner conductor 10 is exposed, and the coaxial cable inner conductor 10 is welded with the central needle 22; then, an elastic kneading elastic sheet 50 with an opening at the side wall of the elastic sheet 50 is loaded into the outer conductor 21, the elastic sheet 50 is clamped in the groove 41 after elastic recovery, when the connector 2 is connected with the access end of the coaxial cable body 1, the central needle 22 is in slide-in connection with the central needle 22, the connector 2 and the cable body 1 are ensured to be on the same axis, the elastic sheet 50 is in close contact with the access end of the coaxial cable body 1 along with the access of the access end of the coaxial cable body 1, the elastic bending on the elastic strip 52 is in close contact with the access end of the coaxial cable body 1, and the elastic sheet edges 51 at two ends are elastically pressed, so that the elastic sheet edges 51 are in close contact with the outer conductor 21, thereby increasing the electric contact between the connector 2 and the access end of the coaxial cable body 1, enabling the electric signal transmission to be stable and having high electromagnetic shielding performance; after completing the assembly of the cable body 1 and the connector 2, trimming the redundant shielding layer at the joint of the tail part of the access end of the cable body 1 and the metal copper pipe 3 completely, then selecting a proper stamping jig to press the metal sleeve 3 into a specific shape, pressing the shielding layer of the cable body 1, the metal sleeve 3 and the connector 2 tightly, and then performing injection molding to obtain the embodiment.
Compared with the prior art, the invention has the advantages that: 1. the cable body is tightly connected with the connector through the metal sleeve with the elastic rubber sleeve, the cable is suitable for being used in an environment with strong vibration impact, the compression joint strength is high, the tensile strength is good, the radial section of the metal sleeve is regular hexagon, the outer surface of the metal sleeve is concave into a cambered surface, after the metal sleeve is compressed with the access end of the coaxial cable, the outer surface of the connecting end of the metal sleeve is regular in shape and free of flash formation, the injection molding thickness of the injection molding layer is uniform, the shielding effect on the connector is good, and the shielding performance of the coaxial cable is improved; 2. the coaxial annular metal sleeve also ensures that the cable is arranged in the center of the connector after being installed, the local electric field is not over-strong due to uneven electric field distribution, point discharge can be effectively eliminated, stress is more uniformly distributed, the cable is arranged in the center of the electric connector after being installed, and the effect of a grading ring can be realized, so that the electric field at the joint is uniformly distributed to the surrounding grounding area, the occurrence of corona discharge is avoided, and the cable and a machine cannot be damaged; 3. the shielding layer adopts a comprehensive structure of a single-side hot-melt aluminum foil layer, a high-quality alloy wire braid layer and non-adhesive aluminum foil layers on two sides accumulated layer by layer, so that the flexible bending-resistant requirement of the cable is met, and the shielding performance is further improved; 4. the outer conductor of the connector is machined by turning, the wall thickness of the outer conductor is not provided with a groove, electromagnetic leakage is reduced, an elastic sheet with radial elasticity for fixing the inner conductor is arranged at the joint of the central needle and the outer conductor so as to increase the electric contact of the outer conductor when the connector is matched, the electric signal transmission stabilizes the insulator, and the insulator is provided with a plurality of through holes so as to reduce the mixed dielectric constant of the insulator, so that the transmission performance of the cable is optimized.
In conclusion, the innovative structure of the coaxial cable improves the shielding performance of the cable while ensuring the flexibility, bending resistance and compression resistance of the coaxial cable, and as can be seen from the test charts of fig. 10 to 15 showing that the transition impedance and the shielding attenuation change along with the frequency, the shielding attenuation of the coaxial cable can reach more than 85 dB within the frequency range of 1.0 MHZ to 2000.0 MHZ; the transmission efficiency is improved while the shielding performance of the coaxial cable is greatly improved and the transmission efficiency is improved when the transmission efficiency is improved to 100 MHZ-200 MHZ is more than 105 dB which is higher than 95 dB in the prior art, the transmission efficiency accords with the European standard, the quality of high-frequency signals transmitted in the coaxial cable can be fully ensured not to be influenced, and the transfer impedance of the coaxial cable is reduced and is less than or equal to 5.0 mohm/m between 1.0 MHz and 2000.0 MHz.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (9)
1. The connection method of the pressure-resistant coaxial cable with the shielding effect improved comprises a cable body and a connector arranged at the tail end of the cable body, and is characterized in that the cable body is in compression connection with the connector through a metal sleeve, the metal sleeve consists of an elastic rubber sleeve and a metal pipe fixedly crimped outside the elastic rubber sleeve, and the connection method comprises the following steps:
s1: stripping a sheath layer at the access end of the cable body to expose the shielding layer, and brushing a braid layer of the shielding layer by using a reverse brushing device;
s2: sleeving a metal sleeve on the access end of the cable body with the sheath layer stripped off, and turning back and uniformly attaching the shielding layer to the outer wall of the metal sleeve;
s3: cutting off the polyethylene insulating layer to expose the inner conductor of the cable, and welding the inner conductor with the center pin;
s4: the connector and the access end of the coaxial cable body are connected in a sliding-in type mode in a mode that the center of the connector is opposite to the center needle, and the connector and the cable body are ensured to be on the same axis;
s5: trimming the redundant shielding layer at the joint of the tail part of the access end of the cable body and the metal copper pipe, selecting a proper stamping jig to press the metal sleeve into a specific shape, and tightly pressing the shielding layer of the cable body, the metal sleeve and the connector;
s6: the cable body, the metal sleeve and the connector are subjected to integral injection molding, and the compression-resistant coaxial cable with the shielding effect improved is obtained;
s7: testing whether the performance of the coaxial cable after injection molding meets the requirement;
the cable body comprises an inner conductor, a polyethylene insulating layer, two layers of aluminum foils, a metal shielding layer and a sheath layer, wherein the inner conductor is sequentially coated from inside to outside in the radial direction; the polyethylene is foaming cross-linked polyethylene or irradiation solid polyethylene; the inner conductor is a copper core or a tinned copper core or a silvered copper core;
the shielding layer comprises a single-sided hot-melt aluminum foil layer, an alloy wire weaving layer and a non-bonding type two-sided aluminum foil layer which are sequentially coated from inside to outside, and the single-sided hot-melt aluminum foil layer and the non-bonding type two-sided aluminum foil layer are fixed on the cable body in a corrugated shape; and a second woven layer is further arranged outside the non-bonding type two-sided aluminum foil layer and is a tin-dipped woven layer.
2. The method as claimed in claim 1, wherein the elastic rubber sleeve is made of silica gel, the metal tube is a copper tube, the inner conductor, the insulating layer and the shielding layer are not extruded, the insulating layer is cut neatly without metal chips and other pollution on the surface after the insulating layer and the shielding layer are trimmed, and the shielding layer has a neat cut, no burr and no rolling.
3. The method as claimed in claim 1, wherein the inner conductor is welded to the center pin reliably, and no void exceeding 1/6 of the diameter is formed at the joint of the shield layer, the metal sleeve and the connector by X-ray inspection.
4. The method as claimed in claim 1, wherein the connector includes a cylindrical outer conductor, a central pin is disposed inside the outer conductor, a jack extends from the outer end of the connector and outside the central pin, the outer diameter of the jack is smaller than the inner diameter of the metal sleeve, and an insulator is disposed between the central pin and the outer conductor.
5. The method for connecting a coaxial cable with improved shielding effect according to claim 1, wherein the outer diameter of the socket in the connector is 5.00-5.05 mm, the inner diameter of the metal sleeve is 6.35-6.40 mm, and the thickness of the elastic rubber sleeve in the metal sleeve is 0.50-1.00mm.
6. The method as claimed in claim 1, wherein the metal sleeve and the outer surface of the cable body are formed into six faces by riveting a hexagon, each face is recessed into an arc face, and the radial cross section of the metal sleeve is a regular hexagon.
7. The method for connecting a compression-resistant coaxial cable with improved shielding effect as claimed in claim 1, wherein the reverse brush device comprises a rotating shaft and a brush head disposed at an upper end of the rotating shaft, the brush head comprises brush needles, the brush needles are disposed along an outer surface of the brush head, the brush needles are disposed in a vertical group, an inclined group or a horizontal group, and the brush needles can be withdrawn from a brush head body for easy replacement.
8. The method as claimed in claim 1, wherein the cable body is fixedly installed inside the connector jack, the inner conductor of the cable body is inserted and clamped in the center pin, the connector includes an outer conductor, a radially elastic strip is disposed at the connection between the center pin and the outer conductor, the elastic strip is composed of two coaxial ring-shaped elastic strip edges and a plurality of elastic strips connected between the two elastic strip edges, the elastic strip is not closed, an opening is disposed at the side wall of the elastic strip, a groove is disposed around the inner wall of the outer conductor for 360 degrees, the elastic strip is integrally matched with the groove in shape, and the elastic strip is inserted and clamped in the groove.
9. The method as claimed in claim 4, wherein the outer conductor is turned, and the insulator and the outer conductor are tightly fitted by punching the outer conductor, and the insulator has a plurality of axial through holes with the same size and shape.
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| CN201611249201.0A CN106711634B (en) | 2016-12-29 | 2016-12-29 | Connection method of compression-resistant coaxial cable with improved shielding effect |
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| CN201611249201.0A CN106711634B (en) | 2016-12-29 | 2016-12-29 | Connection method of compression-resistant coaxial cable with improved shielding effect |
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| CN106711634A CN106711634A (en) | 2017-05-24 |
| CN106711634B true CN106711634B (en) | 2022-12-09 |
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| DE102017222809B4 (en) * | 2017-12-14 | 2019-10-02 | Micro-Epsilon Messtechnik Gmbh & Co. Kg | Electrical connector and connector |
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| TWI787448B (en) * | 2018-02-01 | 2022-12-21 | 德商漢高股份有限及兩合公司 | Method for shielding system-in-package assemblies from electromagnetic interference |
| CN110277684B (en) * | 2018-03-15 | 2021-03-09 | 泰科电子(上海)有限公司 | Connector with a locking member |
| CN108879119B (en) * | 2018-08-03 | 2024-03-26 | 广东电网有限责任公司广州供电局 | Cable connection assembly and cable connection method |
| CN109830332B (en) * | 2019-02-21 | 2020-05-26 | 苏州冠韵威电子技术有限公司 | Intermediate frequency coaxial cable and preparation method thereof |
| CN112002469B (en) | 2020-08-18 | 2022-02-11 | 昆山联滔电子有限公司 | Cable and processing method thereof |
| CN113655293B (en) * | 2021-08-16 | 2024-08-27 | 哈尔滨工业大学 | Coaxial connector electromagnetic shielding effectiveness testing device |
| CN117559192A (en) * | 2023-12-29 | 2024-02-13 | 漫博智能科技(镇江)有限公司 | Joint forming method with secondary lock |
| CN117673855A (en) * | 2023-12-29 | 2024-03-08 | 漫博智能科技(镇江)有限公司 | Forming method of waterproof male head |
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| CN106711634A (en) | 2017-05-24 |
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