A signal cable termination device resistant to power frequency current

Abstract

The present invention relates to a termination device for a signal cable resistant to power frequency current, which is used for grounding and discharging current of the signal cable. The signal cable sequentially includes a signal core, a cable tape, an aluminum sheath layer, an insulating layer, an armor layer and an outer skin from inside to outside. Among them, the aluminum sheath layer and the armor layer are shielding layers. It is characterized in that it includes: a sealed housing, the sealed housing has a channel space for the signal cable to pass through, and at least one section of the exposed shielding layer is provided in the channel space; a conductive tape, in a strip shape, the conductive tape is used to tightly wrap the exposed shielding layer to form a wrapping circle on the shielding layer, and an extending tape is integrally extended from the wrapping circle, and the extending tape is used to connect to a grounding bar; a locking mechanism, which is used to lock the wrapping state of the wrapping circle.

Description

Technical Field

[0001] The present invention relates to the technical field of cable termination current drainage, and particularly to a signal cable termination device resistant to power frequency current. Background Art

[0002] The existing cable termination current drainage technology is mainly for lightning protection design. During thunderstorms, if lightning strikes above or near the cable line, a strong lightning current will also be induced on the cable line along the line. Large currents such as traction return current and lightning current are directly introduced into the mechanical room from the outdoor along the line, which easily causes damage to distribution panel equipment, overheating and short-circuit of indoor cables, etc., affecting train operation safety.

[0003] The existing cable termination current drainage technology generally adopts a termination lightning protection technology: using conductive wires twisted into a rope shape for current diversion, welding one end of the conductive wire to a V-shaped clamp, fixing the V-shaped clamp on the shielding layer, or using a hose clamp to tie it to the shielding layer, and then connecting it to a grounding terminal, and the grounding terminal is then connected to a grounded copper busbar or copper strip.

[0004] This method can ground the instantaneous lightning current, but it cannot play a current diversion effect on the misentered power frequency current with a long duration. Under the continuous power frequency current, the conductive wire is prone to heat and cause combustion, further leading to a fire and causing safety accidents; on the other hand, the contact surface formed by welding the conductive wire to the V-shaped clamp is approximately a point contact, and the contact surface formed by the hose clamp tied to the aluminum sheath layer is a line contact, with a very small contact area, resulting in a very limited current transfer capacity, and the incoming current will still cause some interference; and this method connects the armor layer and the aluminum sheath layer in series, which will cause mutual influence and form interference; in addition, this method is relatively cumbersome to install, increasing the construction difficulty and being not conducive to production. Summary of the Invention

[0005] In view of the above situation, it is necessary to provide a signal cable termination device resistant to power frequency current.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a signal cable termination device resistant to power frequency current for grounding and draining current of a signal cable. The signal cable sequentially includes a signal wire core, a cable tape, an aluminum sheath layer, an insulating layer, an armor layer, and an outer skin from the inside to the outside. Among them, the aluminum sheath layer and the armor layer are shielding layers, and it includes: a sealed housing having a channel space for the signal cable to pass through, and at least one section of the exposed shielding layer is provided in the channel space; a conductive tape in a strip shape, which is used to closely wrap the exposed shielding layer to form a wrapping circle on the shielding layer, and an extending tape integrally extends from the wrapping circle, and the extending tape is used to connect to a grounding bar; a locking mechanism for locking the wrapping state of the conductive tape.

[0007] Further, the conductive band includes a first conductive band and a second conductive band that are isolated from each other and tightly wrap the exposed aluminum sheath layer and the armor layer respectively. The grounding strip includes a first grounding strip and a second grounding strip that are isolated from each other. The first conductive band is connected to the first grounding strip, and the second conductive band is connected to the second grounding strip. The locking mechanism includes a first locking mechanism for locking the wrapping state of the first conductive band and a second locking mechanism for locking the wrapping state of the second conductive band.

[0008] Further, a grounding terminal for connecting the conductive band and the grounding strip is provided on the sealed housing. The grounding terminal includes a first terminal and a second terminal extending outside the channel space. The first conductive band, the first terminal, and the first grounding strip are connected in sequence, and the second conductive band, the second terminal, and the second grounding strip are connected in sequence.

[0009] Further, a first through hole for the first conductive band to pass through and a second through hole for the second conductive band to pass through are provided on the sealed housing. The first conductive band is directly connected to the first grounding strip, and the second conductive band is directly connected to the second grounding strip.

[0010] Further, a wrapping circle is formed in the middle section of the conductive band. Both ends of the wrapping circle respectively extend out a section of protruding band. A first rough section and a second rough section with rough structures on both sides are respectively arranged on the two protruding bands. The first rough section and the second rough section are in contact and fit together, and the locking mechanism is clamped at the fitting position of the first rough section and the second rough section.

[0011] Further, a wrapping circle is formed in the middle section of the conductive band. Both ends of the wrapping circle respectively extend out a section of protruding band. The locking mechanism includes a clamping table and a locking bolt. The clamping table is provided with a clamping hole for the two protruding bands to pass through, and a threaded hole adapted to the locking bolt is provided on a radial side of the clamping hole.

[0012] Further, a receiving hole with a blind hole structure or a through hole structure for the locking bolt to extend into is provided on a side of the clamping hole facing away from the threaded hole.

[0013] Further, a wrapping circle is formed in the middle section of the conductive band. Both ends of the wrapping circle respectively extend out a section of protruding band. The locking mechanism is a metal pressing ring. The two protruding bands pass through the metal pressing ring. Tooth teeth that are staggered and squeeze the protruding bands are provided on the upper and lower sides of the inner circle of the metal pressing ring facing the protruding bands, and the metal pressing ring presses and wraps the protruding bands.

[0014] Further, a middle section of the conductive band forms the covering loop, and two ends of the covering loop respectively extend out a section of the extending band. The locking mechanism includes a clamping table and a locking bolt. The clamping table is provided with a clamping hole for the extending band to pass through. The clamping hole is in a T shape and includes a main hole and two sub-holes. The two sections of the extending band extend into the main hole and then respectively extend out from the two sub-holes. A screw hole is arranged on the opposite side of the main hole, and the locking bolt extends into the screw hole and abuts against the bifurcation of the two sections of the extending band.

[0015] Further, the end of the extending band is welded to the armor layer or the exposed aluminum sheath layer and wound to form the covering loop and then welded and fixed. One end of the covering loop far away from the end extends out the extending band.

[0016] The beneficial effects of the present invention are as follows: By covering the armor layer or the exposed aluminum sheath layer with a strip-shaped conductive band, point or line contact is changed into surface contact, with a large contact area, stable contact, and strong conductivity. The strip-shaped conductive band can not only withstand lightning current but also withstand power frequency current. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a signal cable termination device capable of withstanding power frequency current according to an embodiment of the present invention;

[0018] Figure 2 is a schematic structural diagram of another embodiment of a signal cable termination device capable of withstanding power frequency current according to an embodiment of the present invention;

[0019] Figure 3 is a schematic structural diagram of a conductive band of a signal cable termination device capable of withstanding power frequency current according to an embodiment of the present invention;

[0020] Figure 4 is a schematic structural diagram of a clamping table of a signal cable termination device capable of withstanding power frequency current according to an embodiment of the present invention;

[0021] Figure 5 is a schematic structural diagram of a locking mechanism of a signal cable termination device capable of withstanding power frequency current according to an embodiment of the present invention;

[0022] Figure 6 is a schematic structural diagram of another embodiment of a locking mechanism of a signal cable termination device capable of withstanding power frequency current according to an embodiment of the present invention;

[0023] Figure 7 is a schematic structural diagram of yet another embodiment of a locking mechanism of a signal cable termination device capable of withstanding power frequency current according to an embodiment of the present invention;

[0024] Figure 8 is a schematic structural diagram of a signal cable of a signal cable termination device capable of withstanding power frequency current according to an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 100, signal cable; 110, signal wire core; 120, cable tape; 130, aluminum sheath layer;

[0027] 140, insulating layer; 150, armor layer; 160, outer skin; 200, sealing housing;

[0028] 210, channel space; 220, potting hole; 221, potting plug;

[0029] 310, covering ring; 320, extending strip; 321, first rough section; 322, second rough section;

[0030] 330, first conductive strip; 340, second conductive strip; 400, grounding bar; 410, first grounding bar;

[0031] 420, second grounding bar; 510, first locking mechanism;

[0032] 520, second locking mechanism; 530, clamping table; 540, clamping hole; 541, main hole; 542, sub-hole;

[0033] 550, screw hole; 560, locking bolt; 570, receiving hole; 600, grounding terminal;

[0034] 610, first terminal; 620, second terminal. Detailed implementation manners

[0035] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following further details a signal cable termination device resistant to power frequency current according to the present invention in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] Embodiment 1

[0037] Please refer to Figures 1-8, A signal cable termination device resistant to power frequency current, used for grounding and discharging the current of signal cable 100. The signal cable 100 sequentially includes a signal core 110, a cable tape 120, an aluminum sheath layer 130, an insulating layer 140, an armor layer 150, and an outer skin 160 from inside to outside. Among them, the aluminum sheath layer 130 and the armor layer 150 are shielding layers, including: a sealed housing 200, the sealed housing 200 has a channel space for the signal cable 100 to pass through, and at least one section of the exposed shielding layer is in the channel space; a conductive tape, in a strip shape, the conductive tape is used to tightly wrap the exposed shielding layer to form a wrapping circle 310 on the shielding layer, and the wrapping circle 310 integrally extends with an extending tape 320, and the extending tape 320 is used to connect to a grounding bar 400; a locking mechanism to lock the wrapping state of the conductive tape.

[0038] By wrapping the armor layer or the exposed aluminum sheath layer 130 with a strip-shaped conductive tape, the point or line contact is changed to surface contact, with a large contact area, stable contact, and strong conductivity. The strip-shaped conductive tape can not only withstand lightning current but also power frequency current.

[0039] It can be understood that the armor layer 150 is also called the steel tape layer because it is generally made of steel, and the aluminum sheath layer 130 is generally made of aluminum and is also called the inner lining layer. Since the armor layer 150 and the aluminum sheath layer 130 have strong conductivity, the connecting conductive tape is used for grounding and discharging. In particular, a section of the insulating layer 140 is reserved at each end of the exposed aluminum sheath layer 130 to avoid interference between the armor layer 150 and the aluminum sheath layer 130.

[0040] It can be understood that the sealed housing 200 is generally also called a termination box.

[0041] It can be understood that the conductive tape is made of a metal material with strong conductivity and good flexibility. Preferably, the conductive tape is made of purple copper, and brass or other copper alloys can also be selected according to needs. Copper has good conductivity, is easy to bend, has high strength, and is not easy to break.

[0042] Generally, after the conductive tape is fastened, the sealed housing 200 needs to be filled with glue for sealing. Generally, an inclined glue filling hole and a glue filling plug 221 adapted to the glue filling hole are provided on the sealed housing 200. The sealed housing 200 is generally divided into an upper housing and a lower housing. After the conductive tape is fastened, the upper housing and the lower housing are fixed by a hose clamp and then filled with glue for sealing.

[0043] The signal cable shielding layer discharge connection device of the present invention generally includes four mine discharge methods:

[0044] Solution 1: The conductive strip includes a first conductive strip 330 that closely wraps around the exposed aluminum sheath layer 130 and a second conductive strip 340 that closely wraps around the armor layer. The grounding strip 400 includes a first grounding strip 410 and a second grounding strip 420 that are isolated from each other. The first conductive strip 330 is connected to the first grounding strip 410, and the second conductive strip 340 is connected to the second grounding strip 420. The locking mechanism includes a first locking mechanism 510 for locking the wrapped state of the first conductive strip 330 and a second locking mechanism 520 for locking the wrapped state of the second conductive strip 340. The first conductive strip 330 conducts the current on the aluminum sheath layer 130, and the second conductive strip 340 conducts the current on the armor layer 150. Moreover, the first conductive strip 330 and the second conductive strip 340 are isolated from each other, which can avoid mutual interference.

[0045] Solution 2: The conductive strip includes a first conductive strip 330 that wraps around the aluminum sheath layer 130 and a second conductive strip 340 that wraps around the armor layer 150. The first conductive strip 330 and the second conductive strip 340 are connected to the same grounding strip 400. The current is conducted out through the same grounding strip 400, which can save costs.

[0046] Solution 3: The conductive strip only wraps around the aluminum sheath layer 130.

[0047] Solution 4: The conductive strip only wraps around the armor layer 150. It can be understood that in this case, there is no need to expose the aluminum sheath layer 130.

[0048] Specifically, it can be selected according to needs. Preferably, it is Solution 1.

[0049] The connection between the conductive strip and the grounding strip 400 can be a direct connection or an indirect connection.

[0050] Please refer to Figure 2 , and a grounding terminal 600 for connecting the conductive strip and the grounding strip 400 is provided on the sealed housing 200.

[0051] When the conductive strip is connected in the manner of Solution 1, the grounding terminal 600 includes a first terminal and a second terminal that extend outside the channel space 210. The first conductive strip 330, the first terminal, and the first grounding strip 410 are connected in sequence, and the second conductive strip 340, the second terminal, and the second grounding strip 420 are connected in sequence. It can be understood that the first grounding strip 410 and the second grounding strip 420 are generally isolated from each other to avoid interference. When the conductive strip is connected in the manner of Solution 2, please refer to Figure 2 , the first conductive strip 330 and the second conductive strip 340 are commonly connected to the same grounding terminal 600, and the grounding terminal 600 is connected to the grounding strip 400.

[0052] Or, please refer to Figure 1The sealed housing 200 is provided with a through-hole compatible with the conductive strip, and the conductive strip passes through the through-hole to directly connect to the grounding strip 400. When the conductive strip is connected in the manner of Scheme 1, the through-hole includes a first through-hole and a second through-hole. The sealed housing 200 is provided with a first through-hole for the first conductive strip 330 to pass through and a second through-hole for the second conductive strip 340 to pass through. The first conductive strip 330 is directly connected to the first grounding strip 410, and the second conductive strip 340 is directly connected to the second grounding strip 420. Generally, direct connection is achieved by welding. Usually, the connection between the first conductive strip 330 and the first terminal and the connection between the second conductive strip 340 and the second terminal are generally welded. After eliminating the first and second terminals, the welding is moved outside the sealed housing 200, which is convenient for operation. Traditional conductive wires have low strength and must be connected to the grounding strip 400 through terminals, otherwise they are prone to breakage. After using conductive strips, the strength is improved and they can be directly connected to the grounding strip 400.

[0053] Example 2

[0054] See Figure 3 The middle section of the conductive tape forms a wrapping ring 310, and a protruding tape 320 extends from each end of the wrapping ring 310. The two protruding tapes 320 are respectively provided with a first rough section 321 and a second rough section 322, both of which have rough structures on both sides. The first rough section 321 and the second rough section 322 are in contact with each other, and the locking mechanism is clamped at the junction of the first rough section 321 and the second rough section 322. The first rough section 321 and the second rough section 322 are in contact with each other, and the rough structure can ensure the stable wrapping of the wrapping ring 310 and prevent the two protruding tapes 320 from moving relative to each other; the locking mechanism is clamped at the junction of the first rough section 321 and the second rough section 322. Since both sides have rough structures, the stability of the clamping can be ensured. Generally, the rough structure can be formed by engraving lines on the conductive tape, or by providing bumps or ridges.

[0055] Implementation Three

[0056] Example 3 is one of the solutions for the locking mechanism, see Figures 4-7 The middle section of the conductive strip forms a wrapping ring 310, with a protruding strip 320 extending from each end of the wrapping ring 310. The locking mechanism includes a clamping platform 530 and a locking bolt 560. The clamping platform 530 is provided with a clamping hole 540 for the two protruding strips 320 to pass through. A screw hole 550 is provided on a radial side of the clamping hole 540, which is compatible with the locking bolt 560. The bolts abut or penetrate the conductive strip, thereby tightening the conductive strip and making the conductive strip more tightly wrapped. Generally, when the bolts penetrate the conductive strip, corresponding fixing holes can be provided on the conductive strip.

[0057] See Figure 6, on the side of the clamping hole 540 facing away from the screw hole 550, there is a receiving hole 570 with a blind hole structure or a through hole structure for the locking bolt 560 to extend into. This facilitates the extension of the bolt, which can easily penetrate the conductive strip or hold the conductive strip and enter the blind hole or through hole.

[0058] Simply, Embodiment III can be combined with Embodiment II to enhance the fastening effect.

[0059] Embodiment IV

[0060] Embodiment IV is one of the solutions of the locking mechanism. A wrapping circle 310 is formed in the middle section of the conductive strip. Both ends of the wrapping circle 310 respectively extend out a section of extending strip 320. The locking mechanism is a metal pressing ring. The two extending strips 320 pass through the metal pressing ring. On the upper and lower sides of the inner circle of the metal pressing ring facing the extending strip 320, there are tooth teeth arranged alternately to squeeze the extending strip 320, and the metal pressing ring presses and wraps the extending strip 320. Generally, the metal pressing ring is used in combination with a stamping machine.

[0061] Simply, Embodiment IV can be combined with Embodiment III to enhance the fastening effect.

[0062] Embodiment V

[0063] Embodiment V is one of the solutions of the locking mechanism. A wrapping circle 310 is formed in the middle section of the conductive strip. Both ends of the wrapping circle 310 respectively extend out a section of extending strip 320. The locking mechanism includes a clamping table 530 and a locking bolt 560. The clamping table 530 is provided with a clamping hole 540 for the extending strip 320 to pass through. The clamping hole 540 is in a T shape and includes a main hole 541 and two sub-holes 542. The two extending strips 320 extend into the main hole 541 and then respectively extend out from the two sub-holes 542. A screw hole 550 is arranged on the opposite side of the main hole 541, and the locking bolt 560 extends from the screw hole 550 to abut against the bifurcation of the two extending strips 320. After the conductive strip is bent in the cross hole, it is not easy to fall off, and the two extending strips 320 are not easy to move relative to each other.

[0064] Embodiment VI

[0065] Embodiment VI is another locking method. The end of the extending strip 320 is welded to the armor layer or the exposed aluminum sheath layer 130 and wound to form a wrapping circle 310 and welded and fixed. One end of the wrapping circle 310 away from the end extends out the extending strip 320.

[0066] In summary, a signal cable end forming device resistant to power frequency current provided by the present invention changes the point or line contact into a surface contact by wrapping the armor layer or the exposed aluminum sheath layer with a strip-shaped conductive strip, with a large contact area, stable contact, strong conductivity. The strip-shaped conductive strip can not only withstand lightning current but also power frequency current. And the connection is stable, the installation is fast and simple, and the reliability is strong.

[0067] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A signal cable termination device resistant to power frequency current, used for grounding and discharging current of the signal cable. The signal cable sequentially includes a signal core, a cable tape, an aluminum sheath layer, an insulating layer, an armor layer, and an outer skin from inside to outside, wherein, The aluminum sheath layer and the armor layer are shielding layers, and are characterized by comprising: A sealed housing having a channel space for the signal cable to pass through, and at least one section of the exposed shielding layer is provided in the channel space; A conductive strip in a strip shape, which is used to tightly wrap the exposed shielding layer to form a wrapping loop on the shielding layer, and an extending strip integrally extends from the wrapping loop, and the extending strip is used to connect to a grounding bar; A locking mechanism for locking the wrapping state of the wrapping loop; The middle section of the conductive strip forms the wrapping loop, and two sections of the extending strip respectively extend from both ends of the wrapping loop. The locking mechanism includes a clamping platform and a locking bolt. The clamping platform is provided with a clamping hole for the extending strip to pass through. The clamping hole is in a T shape and includes a main hole and two sub-holes. The two sections of the extending strip extend into the main hole and then respectively extend out from the two sub-holes. A screw hole is provided on the opposite side of the main hole, and the locking bolt extends into the screw hole to abut against the bifurcation of the two sections of the extending strip.

2. The signal cable termination device resistant to power frequency current according to claim 1, wherein The conductive strip includes a first conductive strip that tightly wraps the exposed aluminum sheath layer and a second conductive strip that tightly wraps the armor layer and are isolated from each other. The grounding bar includes a first grounding bar and a second grounding bar that are isolated from each other. The first conductive strip is connected to the first grounding bar, the second conductive strip is connected to the second grounding bar, and the locking mechanism includes a first locking mechanism for locking the wrapping state of the first conductive strip and a second locking mechanism for locking the wrapping state of the second conductive strip.

3. The signal cable termination device resistant to power frequency current according to claim 2, characterized in that A grounding terminal for connecting the conductive strip and the grounding bar is provided on the sealed housing. The grounding terminal includes a first terminal and a second terminal extending outside the channel space. The first conductive strip, the first terminal, and the first grounding bar are sequentially connected, and the second conductive strip, the second terminal, and the second grounding bar are sequentially connected.

4. The signal cable termination device resistant to power frequency current according to claim 2, characterized in that, A first through hole for the first conductive strip to pass through and a second through hole for the second conductive strip to pass through are provided on the sealed housing. The first conductive strip is directly connected to the first grounding bar, and the second conductive strip is directly connected to the second grounding bar.

5. The signal cable termination device resistant to power frequency current according to claim 1, characterized in that, The middle section of the conductive strip forms the wrapping loop, and two sections of the extending strip respectively extend from both ends of the wrapping loop. A first rough section and a second rough section with a rough structure on both sides are respectively provided on the two sections of the extending strip. The first rough section and the second rough section are in contact and fit with each other, and the locking mechanism clamps at the fitting position of the first rough section and the second rough section.

6. The signal cable termination device resistant to power frequency current according to claim 1, characterized in that The end of the extending strip is welded to the armor layer or the exposed aluminum sheath layer to wind and form the wrapping loop and is welded and fixed, and one end of the wrapping loop away from the end extends out the extending strip.

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