A synthetic cable for subway power and signal transmission

Abstract

The invention discloses a synthetic cable for subway power and signal transmission, comprising a first joint, an outer protective sleeve, and a cable insulating layer, wherein one end of the synthetic cable is connected to the first joint; a steel wire armor is arranged inside the outer protective sleeve, wherein the steel wire armor is provided with two layers, wherein the steel wire armor is arranged inside a cable insulating layer, wherein the cable insulating layer is provided inside a cable shielding layer, wherein the cable shielding layer is provided inside a wire core; the first joint is connected to the cable, wherein the outermost layer of the first joint is provided with a second insulating layer, wherein a flange is arranged outside the first insulating layer, and bolts are arranged on the flange; the inner side of the second insulating layer is a cable insulating layer, wherein the inner side of the cable insulating layer is a cable shielding layer, wherein the inner side of the cable shielding layer is a wire core, wherein one end of the wire core away from the outer protective sleeve of the cable is connected to a conductive block, wherein the conductive block is provided with a watchband contact finger; the cable connection efficiency of the invention is high, and the connection slippage is effectively prevented by a clamping mechanism, and the stability and safety are high.

Description

Technical Field

[0001] The invention belongs to the field of subway cable equipment, and in particular relates to a synthetic cable used for subway power and signal transmission. Background Art

[0002] Cables are usually rope-like cables made of several or several groups of conductors (at least two in each group). Each group of conductors is insulated from each other and are often twisted around a center wire. The entire outside is covered with a highly insulating covering. my country's subway is developing rapidly, and the subway's power and signal transmission, lighting, and air-conditioning systems are all transmitted through cables.

[0003] At present, subway power cables and distribution cables are generally connected by heat shrink or cold shrink, which is extremely inconvenient during construction and difficult to install. If the installation is not done properly, fire, explosion and other accidents may occur easily. Heat shrink or cold shrink has a long operation time and low connection efficiency, which seriously affects the overall construction process. The existing plug connectors on the market are prone to slipping when the cables are subjected to large tension in the later stage of construction due to loose connections, resulting in poor connection effect, which needs to be improved.

[0004] Chinese patent application No. 201120243044.9 discloses a novel cable plug, comprising a cable and a plug, wherein a suction device is installed on the cable. The suction device is a suction cup, wherein the suction cup comprises a suction cup connecting column connected to the cable, and a suction cup is connected to the suction cup connecting column. The novel cable plug has a suction cup installed on the cable constituting the cable plug, and the cable can be fixed by the suction cup.

[0005] By using suction cups to strengthen the fixed connection between cable connectors, it is easy for the heating of the cables to reduce the suction force of the suction cups, thus affecting the connection effect.

[0006] Chinese patent application No. 201320393753.4 discloses a portable single-head or multi-head cable plug fixture. It has a single-frame fixing frame or a multi-frame fixing frame, the multi-frame fixing frame is composed of a plurality of single frames arranged in a horizontal row, a table fixing clamp is fixedly connected to the middle of the lower horizontal frame of the single-frame fixing frame or the multi-frame fixing frame, the upper horizontal frame of the single-frame fixing frame or the upper horizontal frames of each single frame of the multi-frame fixing frame are used as a fixing clip of a cable plug, and a hand-pressed movable clip structure is also installed on each single frame of the single-frame fixing frame or the multi-frame fixing frame.

[0007] Connection by crimping is prone to leakage, has poor insulation effect, and is prone to safety accidents; crimping is prone to poor contact and power outage due to loose crimping. Summary of the invention

[0008] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a synthetic cable for subway power and signal transmission. By setting a first connector at one end of the cable and cooperating with a second connector, the subway power machine signal transmission cable can be quickly installed, the efficiency of cable connection is improved, the construction time is saved and the construction difficulty is reduced; on the other hand, the steel wire armor arranged inside the cable is coordinated with the clamping mechanism arranged at the second connector, and the clamping mechanism is specifically arranged according to the double-layer armored connector of the cable; the steel wire armor is embedded into the gap between the first insulating tube, the second insulating tube and the third insulating tube arranged in a wedge shape, and the first connector and the second connector of the cable are locked by utilizing the principle of frictional self-locking of the inclined surface, which effectively prevents slipping and further increases the safety of use.

[0009] The present invention provides the following technical solutions:

[0010] A synthetic cable for subway power and signal transmission, comprising a first joint, an outer protective sleeve, and a cable insulation layer, wherein one end of the synthetic cable is connected to the first joint; a steel wire armor is arranged inside the outer protective sleeve, wherein the steel wire armor is provided with two layers, wherein the steel wire armor is arranged inside a cable insulation layer, wherein the cable insulation layer is provided inside a cable shielding layer, wherein the cable shielding layer is provided inside a wire core; the first joint is connected to the cable, wherein the outermost layer of the first joint is provided with a second insulation layer, wherein a flange is arranged outside the first insulation layer, and bolts are arranged on the flange; the inner side of the second insulation layer is a cable insulation layer, wherein the inner side of the cable insulation layer is a cable shielding layer, wherein the inner side of the cable shielding layer is a wire core, wherein one end of the wire core away from the outer protective sleeve of the cable is connected to a conductive block, wherein a strap contact finger is arranged on the conductive block.

[0011] Preferably, the first connector is matched and connected with a second connector, and both ends of the second connector are connected with a clamping mechanism; the outermost layer of the second connector is provided with a flame retardant layer, the inner side of the flame retardant layer is provided with a metal grounding layer, the inner side of the metal grounding layer is provided with a first insulating layer, and the interior of the first insulating layer is provided with a conductive tube.

[0012] Preferably, the clamping mechanism comprises a first insulating sleeve, and a threaded hole is formed on the outer side of the first insulating sleeve, and the threaded hole is matched and connected with the bolts on the flange.

[0013] Preferably, a second insulating sleeve is provided on the inner side of the first insulating sleeve, a third insulating sleeve is provided on the inner side of the second insulating sleeve, and a socket is provided on the inner side of the third insulating sleeve.

[0014] Preferably, gaps are provided between the first insulating sleeve, the second insulating sleeve and the third insulating sleeve; the outer wall of the first insulating sleeve is cylindrical and the inner wall is conical; the inner and outer walls of the second insulating sleeve are both cylindrical; the outer wall of the third insulating sleeve is cylindrical and the inner wall is cylindrical.

[0015] Preferably, when the first connector is plugged into the second connector, the cable inside the first connector has two layers of steel wire armor, the outer layer of steel wire armor is embedded between the first insulating sleeve and the second insulating sleeve; the inner layer of steel wire armor is embedded between the second insulating sleeve and the third insulating sleeve.

[0016] Preferably, when the first connector is plugged into the second connector, the conductive block of the first connector is connected to the conductive tube through the plug hole of the second connector.

[0017] Preferably, the cable shielding layer is formed by vulcanization of semiconductor rubber mold; the conductive tube inside the second connector, the metal grounding layer, and the mounting end faces of the first connector and the second connector are all made by mechanical processing, and surface electroplating or pickling and oxidation treatment is performed after mechanical processing.

[0018] Preferably, the first connector and the second connector are both provided with an aluminum shell, and the aluminum shell is grounded. A telescopic spring grounding wire is sleeved on the outside of the first connector and the second connector, and the other end is directly connected to a ground bus or a surrounding grounding body to achieve grounding; and the metal grounding layer is connected to the ground bus or the surrounding grounding body.

[0019] The first joint and the second joint are both insulated by rubber solid compression to ensure good sealing; the insulation material of the first joint and the second joint is rubber insulation.

[0020] The flame retardant layer is made of a mixture of Kevlar fiber and high-temperature inorganic coating. The high-temperature inorganic coating is applied on the Kevlar fiber. After curing, the flame retardant layer has a high melting point, high hardness, good oxidation resistance and thermal shock stability, and can effectively prevent fire and explosion.

[0021] Preferably, in order to achieve better locking of the clamping mechanism and prevent the first joint and the second joint from slipping, the bevel angle of the wedge-shaped body of the clamping mechanism is θ, and the taper λ of the clamping mechanism satisfies that λ is less than or equal to 2θ; the positive pressure N exerted on the steel wire armor in the clamping mechanism and the balancing force F exerted on the steel wire armor in the clamping mechanism satisfy the following relationship:

[0022] F = α·2Ntanθ;

[0023] The units of F and N are Newton, and α is the relationship coefficient, which ranges from 0.683 to 4.372.

[0024] Preferably, the surface of the conductive tube is silver-plated, and after the first connector and the second interface are plugged in, the temperature K of the conductive tube is prevented from rising too high, causing damage to the first connector and the second connector; the outer diameter of the conductive tube is d, the wall thickness of the conductive tube is l, the cross-sectional area of ​​the conductive tube is S, and the current is I, then K satisfies the following relationship:

[0025] K = β·(S / (dl)I) 1 / 2 ;

[0026] In the above formula, K is in °C; d and l are in mm; S is in mm 2 ; I is in ampere; β is the temperature coefficient, ranging from 0.368 to 6.525.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The present invention provides a composite cable for subway power and signal transmission. By setting a first connector at one end of the cable and cooperating with a second connector, the subway power machine signal transmission cable can be quickly installed, the efficiency of cable connection is improved, the construction time is saved, and the construction difficulty is reduced.

[0029] (2) The present invention provides a synthetic cable for subway power and signal transmission, which has a steel wire armor arranged inside the cable and a clamping mechanism arranged at the second joint. The clamping mechanism is specifically arranged according to the double-layer armor joint of the cable. The steel wire armor is embedded into the gap between the first insulating tube, the second insulating tube, and the third insulating tube arranged in a wedge shape. The first joint and the second joint of the cable are locked by the principle of self-locking by friction of the inclined surface, which effectively prevents slipping and further increases the safety of use.

[0030] (3) The present invention is a synthetic cable for subway power and signal transmission. The flame retardant layer is formed by mixing Kevlar fiber and high-temperature inorganic coating. The high-temperature inorganic coating is applied on the Kevlar fiber. After curing, the flame retardant layer has a high melting point, high hardness, anti-oxidation, and good thermal shock stability. It can effectively prevent fire and explosion, and improve safety and durability.

[0031] (4) The present invention provides a composite cable for subway power and signal transmission, which further realizes better locking of the clamping mechanism by limiting the relationship between F, , N, and θ, thereby preventing the first connector and the second connector from slipping off and affecting normal use.

[0032] (5) The present invention provides a synthetic cable for subway power and signal transmission, which uses or limits the relationship between K, S, d, l, and I to better control the heat resistance of the conductive tube, improve the thermal stability of the first joint and the second joint, and further enhance the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a schematic cross-sectional view of a cable of the present invention.

[0035] Figure 2 It is a schematic diagram of the first joint structure of the present invention.

[0036] Figure 3 It is a schematic diagram of the second joint structure of the present invention.

[0037] Figure 4 It is a schematic diagram of the connection structure of the first joint and the second joint of the present invention.

[0038] In the figure: 1. first joint; 2. second joint; 3. first insulating sleeve; 4. second insulating sleeve; 5. third insulating sleeve; 6. flame retardant layer; 7. metal grounding layer; 8. first insulating layer; 9. conductive tube; 10. threaded hole; 11. second insulating layer; 12. flange; 13. steel wire armor; 14. cable insulating layer; 15. outer protective sleeve; 16. cable shielding layer; 17. wire core; 18. conductive block; 19. strap contact; 20. bolt; 21. jack. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Embodiment 1:

[0042] like Figure 1-4As shown, a synthetic cable for subway power and signal transmission includes a first connector 1, an outer protective sheath 15, and a cable insulation layer 14, one end of the synthetic cable is connected to the first connector 1; a steel wire armor 13 is provided inside the outer protective sheath 15, the steel wire armor 13 is provided with two layers, a cable insulation layer 14 is provided inside the steel wire armor 13, a cable shielding layer 16 is provided inside the cable insulation layer 14, and a core 17 is provided inside the cable shielding layer 16; the first connector 1 is connected to the cable, the outermost layer of the first connector 1 is provided with a second insulation layer 11, a flange 12 is provided on the outer side of the first insulation layer 8, and bolts 20 are provided on the flange 12; the inner side of the second insulation layer 11 is the cable insulation layer 14, the inner side of the cable insulation layer 14 is the cable shielding layer 16, the inner side of the cable shielding layer 16 is the core 17, and the end of the core 17 away from the cable outer protective sheath 15 is connected to a conductive block 18, and a strap contact finger 19 is provided on the conductive block 18.

[0043] The first joint 1 is matched and connected with the second joint 2, and the two ends of the second joint 2 are connected with a clamping mechanism; the outermost layer of the second joint 2 is provided with a flame retardant layer 6, the inner side of the flame retardant layer 6 is provided with a metal grounding layer 7, the inner side of the metal grounding layer 7 is provided with a first insulating layer 8, and the interior of the first insulating layer 8 is provided with a conductive tube 9.

[0044] Embodiment 2:

[0045] On the basis of the first embodiment, the clamping mechanism includes a first insulating sleeve 3, and a threaded hole 10 is formed on the outer side of the first insulating sleeve 3, and the threaded hole 10 is matched and connected with the bolt 20 on the flange 12; a second insulating sleeve 4 is provided on the inner side of the first insulating sleeve 3, and a third insulating sleeve 5 is provided on the inner side of the second insulating sleeve 4, and a socket is provided on the inner side of the third insulating sleeve 5; gaps are provided between the first insulating sleeve 3, the second insulating sleeve 4, and the third insulating sleeve 5, and the outer wall of the first insulating sleeve 3 is cylindrical and the inner wall is conical; the inner and outer walls of the second insulating sleeve 4 are both cylindrical; the outer wall of the third insulating sleeve 5 is cylindrical and the inner wall is cylindrical; when the first connector 1 is plugged into the second connector 2, the cable inside the first connector 1 has two layers of steel wire armor 13, the outer layer of the steel wire armor 13 is embedded between the first insulating sleeve 3 and the second insulating sleeve 4; the inner layer of the steel wire armor 13 is embedded between the second insulating sleeve 4 and the third insulating sleeve 5.

[0046] Embodiment 3

[0047] On the basis of the first embodiment, when the first connector 1 and the second connector 2 are plugged in, the conductive block 18 of the first connector 1 is connected to the conductive tube 9 through the socket 21 of the second connector 2; the cable shielding layer 16 is molded by vulcanization of semiconductor rubber; the conductive tube 9 inside the second connector 2, the metal grounding layer 7, the installation end faces of the first connector 1 and the second connector 2 are all made by mechanical processing, and the surface is electroplated or pickled and oxidized after mechanical processing; the first connector 1 and the second connector 2 are both provided with an aluminum shell, and the aluminum shell is grounded, and the telescopic spring grounding wire is sleeved on the outside of the first connector 1 and the second connector 2, and the other end is directly connected to the ground bus or the surrounding grounding body to achieve grounding; and the metal grounding layer 7 is connected to the ground bus or the surrounding grounding body; the first connector 1 and the second connector 2 are both insulated by rubber solid compression to ensure good sealing; the insulation material of the first connector 1 and the second connector 2 is rubber insulation.

[0048] The flame retardant layer 6 is made of a mixture of Kevlar fiber and high-temperature inorganic coating. The high-temperature inorganic coating is applied to the Kevlar fiber. After curing, the flame retardant layer 6 has a high melting point, high hardness, good oxidation resistance, and thermal shock stability, and can effectively prevent fire and explosion.

[0049] Embodiment 4

[0050] In order to achieve better locking of the clamping mechanism and prevent the first joint 1 and the second joint 2 from slipping, the bevel angle of the wedge of the clamping mechanism is θ, and the taper λ of the clamping mechanism satisfies that λ is less than or equal to 2θ; the positive pressure N of the steel wire armor 13 in the clamping mechanism and the balancing force F of the steel wire armor 13 in the clamping mechanism satisfy the following relationship:

[0051] F = α·2Ntanθ;

[0052] The units of F and N are Newton, and α is the relationship coefficient, which ranges from 0.683 to 4.372.

[0053] The surface of the conductive tube 9 is silver-plated to prevent the temperature K of the conductive tube 9 from rising too high after the first connector 1 and the second interface are plugged in, thereby damaging the first connector 1 and the second connector 2; the outer diameter of the conductive tube 9 is d, the wall thickness of the conductive tube 9 is l, the cross-sectional area of ​​the conductive tube 9 is S, and the current is I, then K satisfies the following relationship:

[0054] K = β·(S / (dl)I) 1 / 2 ;

[0055] In the above formula, K is in °C; d and l are in mm; S is in mm 2 ; I is in ampere; β is the temperature coefficient, ranging from 0.368 to 6.525.

[0056] The present invention realizes a synthetic cable for subway power and signal transmission. When connected, the conductive block 18 of the first joint 1 is inserted from the jack 21 of the second joint 2, and the conductive block 18 and the conductive tube 9 of the second joint 2 are more closely contacted through the strap contact finger 19. The bolt 20 on the flange 12 of the first joint 1 and the threaded hole 10 of the second joint 2 are matched and connected with each other. By setting the first joint 1 at one end of the cable and cooperating with the second joint 2, the subway power machine signal transmission cable can be quickly installed, the efficiency of cable connection is improved, the construction time is saved and the construction difficulty is reduced. The steel wire armor 13 set inside the cable is matched with the clamping mechanism set on the second joint 2. The clamping mechanism is specifically set according to the double-layer armor joint of the cable. The steel wire armor is clamped by using the first insulating tube, the second insulating tube and the third insulating tube set in a wedge shape. The device 13 is embedded in the gap therebetween, and the first connector 1 and the second connector 2 of the cable are locked by utilizing the principle of self-locking by friction of the inclined surface, so as to effectively prevent slipping and further increase the safety of use; by setting the flame retardant layer 6, a mixture of Kevlar fiber and high-temperature inorganic coating is adopted, and the high-temperature inorganic coating is brushed on the Kevlar fiber. After curing, the flame retardant layer 6 has high melting point, high hardness, good oxidation resistance and thermal shock stability, and can effectively prevent fire and explosion, and improve safety and durability; by limiting the relationship between F, N, and θ, the clamping mechanism is further locked better to prevent the first connector 1 and the second connector 2 from slipping and affecting normal use; by using or limiting the relationship between K, S, d, l, and I, the heat resistance of the conductive tube 9 is better controlled, the thermal stability of the first connector 1 and the second connector 2 is improved, and the safety of use is further improved.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A synthetic cable for subway power and signal transmission, comprising a first connector (1), an outer protective sheath (15), and a cable insulation layer (14), characterized in that: One end of the synthetic cable is connected to a first connector (1); a steel wire armor (13) is provided inside the outer protective sheath (15); the steel wire armor (13) is provided with two layers; a cable insulation layer (14) is provided inside the steel wire armor (13); a cable shielding layer (16) is provided inside the cable insulation layer (14); a wire core (17) is provided inside the cable shielding layer (16); the first connector (1) is connected to the cable; the outermost layer of the first connector (1) is provided with a second insulation layer (11); a flange (12) is provided on the outer side of the first insulation layer (8); a bolt (20) is provided on the flange (12); the inner side of the second insulation layer (11) is a cable insulation layer (14); the inner side of the cable insulation layer (14) is a cable shielding layer (16); the inner side of the cable shielding layer (16) is a wire core (17); the end of the wire core (17) away from the outer protective sheath (15) of the cable is connected to a conductive block (18); a strap contact finger (19) is provided on the conductive block (18); The first joint (1) is matched and connected with the second joint (2), and the two ends of the second joint (2) are connected with a clamping mechanism; the outermost layer of the second joint (2) is provided with a flame retardant layer (6), the inner side of the flame retardant layer (6) is provided with a metal grounding layer (7), the inner side of the metal grounding layer (7) is provided with a first insulating layer (8), and the interior of the first insulating layer (8) is provided with a conductive tube (9); the clamping mechanism comprises a first insulating sleeve (3), the outer side of the first insulating sleeve (3) begins to have a threaded hole (10), and the threaded hole (10) is matched and connected with the bolt (20) on the flange (12); the inner side of the first insulating sleeve (3) is provided with a second insulating sleeve (4), the inner side of the second insulating sleeve (4) is provided with a third insulating sleeve (5), and the inner side of the third insulating sleeve (5) is provided with a socket; The cable shielding layer (16) is formed by vulcanization of semiconductor rubber mold; the conductive tube (9) inside the second joint (2), the metal grounding layer (7), the mounting end faces of the first joint (1) and the second joint (2) are all made by mechanical processing, and the surface is electroplated or pickled and oxidized after the mechanical processing; the first joint and the second joint are both provided with an aluminum shell, and the aluminum shell is grounded, and a telescopic spring grounding wire is sleeved on the outside of the first joint and the second joint, and the other end is directly connected to a ground bar or a surrounding grounding body to achieve grounding; the metal grounding layer (7) is connected to the ground bar or the surrounding grounding body.

2. A synthetic cable for subway power and signal transmission according to claim 1, characterized in that: Gaps are provided between the first insulating sleeve (3), the second insulating sleeve (4) and the third insulating sleeve (5); the outer wall of the first insulating sleeve (3) is cylindrical and the inner wall is conical; the inner and outer walls of the second insulating sleeve (4) are both cylindrical; and the outer wall of the third insulating sleeve (5) is cylindrical and the inner wall is cylindrical.

3. A synthetic cable for subway power and signal transmission according to claim 1, characterized in that: When the first connector (1) is plugged into the second connector (2), the cable inside the first connector (1) has two layers of steel wire armor (13), the outer layer of the steel wire armor (13) is embedded between the first insulating sleeve (3) and the second insulating sleeve (4); and the inner layer of the steel wire armor (13) is embedded between the second insulating sleeve (4) and the third insulating sleeve (5).

4. A synthetic cable for subway power and signal transmission according to claim 1, characterized in that: When the first connector (1) and the second connector (2) are plugged together, the conductive block (18) of the first connector (1) is connected to the conductive tube (9) via the plug hole (21) of the second connector (2).

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