A pre-branching cable

Abstract

The present application relates to the technical field of cable, especially to a pre-branch cable, comprising a main cable and a branch cable, which are provided with a connecting frame, the upper end of the connecting frame is internally provided with at least three annular air bags, the upper end of the connecting frame is internally provided with a compression assembly for compressing and fixing the main cable by expanding the annular air bags, and the connecting frame is provided with a humidity monitoring assembly for detecting the humidity of the cable installation environment, the main cable is compressed and fixed by the expansion of the annular air bags, so as to guarantee the adhesion between the annular air bags and the main cable, the main cable is fully wrapped, the vibration in all directions is effectively absorbed, the PVA film and the mechanical structure are used as the humidity detection means, the problem that the electronic parts are aged or fail due to the influence of external force vibration is effectively avoided, and the service life of the humidity monitoring assembly is longer than that of the electronic humidity sensor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cables, in particular to a pre-branching cable. BACKGROUND

[0002] The pre-branching cable is a cable with branches made in a factory according to the type, specification, cross section, length and branch position of the main and branch cables required by the cable user.

[0003] The existing pre-branching cable has the following defects in actual use:

[0004] The metal joint of the existing pre-branching cable is prone to electrochemical corrosion under high humidity conditions, resulting in thickening of the oxidation layer on the contact surface, nonlinear increase of the contact resistance, and then causing local overheating or excessive leakage current. When the laying carrier is deformed by external force or the seal fails to produce cracks, external liquid water or water vapor will penetrate into the cable surface along the cracks to form a persistent high humidity microenvironment. Since the pre-branching cable uses an embedded fixed installation structure, the branch node is completely packaged inside the carrier, and the humidity parameter inside the carrier cannot be monitored in real time through conventional inspection methods, making it difficult for operation and maintenance personnel to obtain early warning signals in a timely manner, causing safety hazards to accumulate and amplify. In addition, the traditional cable branch connection uses a waterproof tape wrapping process, and the physical stability of the fixed way through the tape is insufficient in earthquake-prone areas, which becomes a high-risk point of line failure. SUMMARY

[0005] The purpose of the present application is to solve the problem that the existing technology cannot monitor the humidity parameter inside the carrier in real time through conventional inspection methods and the fixed stability is insufficient due to the influence of vibration on the tape adhesion. A pre-branching cable is provided.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] A pre-branching cable, comprising a main cable and a branch cable, a connecting frame is provided on the main cable and the branch cable, at least three annular air bags are provided inside the upper end of the connecting frame, a compression assembly for compressing and fixing the main cable by inflating the annular air bags is provided inside the upper end of the connecting frame, at least one elastic band is provided inside the lower end of the connecting frame, a binding assembly for binding and fixing the main cable and the branch cable by the elastic band is provided inside the lower end of the connecting frame, and a humidity monitoring assembly for detecting the humidity of the cable installation environment is installed on the connecting frame.

[0008] Preferably, a first wire hole for movably sleeving the main cable and a second wire hole for movably sleeving the branch cable are formed on the connecting frame, the first wire hole is a through hole structure with an upper and lower opening, and the height of the first wire hole is twice the height of the second wire hole.

[0009] Preferably, the compression assembly comprises:

[0010] An air pressure cavity formed on the inner wall of the first wire hole and in communication with the annular air bag;

[0011] A mounting plate fixed at one end of the air pressure cavity away from the annular air bag;

[0012] A drive rod threadedly connected to the mounting plate;

[0013] A first piston sliding in the air pressure cavity and connected to the drive rod.

[0014] Preferably, a sealing groove is formed on the mounting plate, a knob is fixed at one end of the drive rod away from the mounting plate, a sealing soft pad corresponding to the sealing groove is fixed on the side of the knob close to the mounting plate, the sealing groove and the sealing soft pad are annular structures, and the cross sections of the sealing groove and the sealing soft pad are triangular structures.

[0015] Preferably, the binding assembly comprises:

[0016] A mounting cavity formed on both sides of the lower end of the connecting frame;

[0017] A traction rope movably arranged in the mounting cavity and fixedly connected to the elastic band;

[0018] A support plate fixed on the inner wall of the mounting cavity;

[0019] A connecting plate fixed on the upper end of the traction rope;

[0020] A return spring fixed between the support plate and the connecting plate;

[0021] A counterweight column fixed on the lower end of the traction rope.

[0022] Preferably, a movable hole for movably sleeving the traction rope is formed on the support plate, and the return spring is movably sleeved on the traction rope.

[0023] Preferably, the humidity monitoring assembly comprises:

[0024] A sliding rod sliding on the connecting frame;

[0025] A sealing plate fixed on the sliding rod;

[0026] A mounting disc fixed on the closing plate;

[0027] A central shaft rotating on the mounting disc;

[0028] A pointer fixed on an end of the central shaft extending out of the mounting disc;

[0029] A receiving frame fixed in the mounting disc, in which a PVA film is stored;

[0030] A second piston sliding in the receiving frame and in active abutment with the PVA film;

[0031] A driving rack fixed on the second piston;

[0032] A driven gear fixed on the central shaft and in mesh with the driving rack.

[0033] Preferably, a first sliding hole corresponding to the sliding rod is formed on the top end of the connecting frame, and a second sliding hole corresponding to the sliding rod is formed on the lower side of the connecting frame.

[0034] Preferably, a plurality of marks for indicating the size of humidity are arranged on the outer wall of the mounting disc, and the end of the pointer always corresponds to one of the marks.

[0035] Preferably, microporous ceramics are arranged on the side of the mounting disc and the receiving frame away from the second piston, and a guide through hole for slidingly sleeving the driving rack is formed on the receiving frame.

[0036] Compared with the prior art, the present application has the following advantages:

[0037] 1、The main cable is fixed by the inflation of the annular air bag in the present application, so as to guarantee the adhesion between the annular air bag and the main cable, effectively absorb vibrations in all directions by fully wrapping the main cable, and slowly release the stored energy by using the elastic restoring force of the annular air bag to reduce the impact peak.

[0038] 2、The main cable and the branch cable are fixed by tightening the elastic band in the present application, and the elastic band can be automatically tightened by cooperating with the counterweight column, which greatly shortens the construction time, and the elastic band allows multiple tightening adjustment, which is convenient for quick disassembly or re-fixing during later maintenance, and the elastic band continuously provides uniform radial pressure to automatically compensate for the size change of the cable caused by temperature change or vibration to prevent loosening.

[0039] 3. The present invention utilizes the volume expansion of the PVA film after moisture absorption to drive the driving rack and the driven gear to operate, so that the pointer rotates, and cooperates with the mark made on the mounting plate to digitize the humidity environment. In addition, the PVA film and mechanical structure are used as a means of humidity detection, which effectively avoids the problem of electronic components aging or malfunctioning due to external force vibration, making the humidity monitoring component have a longer service life than the electronic humidity sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall structure proposed by the present invention;

[0041] Figure 2 This is a schematic diagram of the factory state of the connecting frame proposed by the present invention;

[0042] Figure 3 This is a schematic diagram of the connecting frame structure proposed by the present invention;

[0043] Figure 4 For the present invention Figure 3 The cross-sectional view proposed in

[0044] Figure 5 For the present invention Figure 4 Schematic diagram of the locally enlarged structure of A proposed in;

[0045] Figure 6 For the present invention Figure 4 Schematic diagram of the local enlarged structure of B proposed in;

[0046] Figure 7 This is a schematic diagram of the structure of the humidity monitoring component proposed in the present invention;

[0047] Figure 8 For the present invention Figure 7 Cross-sectional view presented in .

[0048] In the picture:

[0049] 1. Main cable;

[0050] 2. Branch cable;

[0051] 3. Connecting frame;

[0052] 4. Annular airbag;

[0053] 5. Compression assembly; 501. Air pressure chamber; 502. Mounting plate; 503. Drive rod; 504. First piston;

[0054] 6. Elastic band;

[0055] 7. Binding assembly; 701. Mounting cavity; 702. Towing rope; 703. Support plate; 704. Connecting plate; 705. Return spring; 706. Counterweight column;

[0056] 8, humidity monitoring assembly; 801, sliding rod; 802, closing plate; 803, mounting disc; 804, central shaft; 805, pointer; 806, receiving frame; 807, second piston; 808, driving rack; 809, driven gear;

[0057] 9, first wire hole;

[0058] 10, second wire hole. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments.

[0060] Referring to Figures 1-8 A pre-branch cable includes a main cable 1 and a branch cable 2, and a connecting frame 3 is arranged on the main cable 1 and the branch cable 2 in a matched manner. The connecting frame 3 is provided with a first wire hole 9 for movably sleeving the main cable 1 and a second wire hole 10 for movably sleeving the branch cable 2. The first wire hole 9 is a through hole structure with an upper opening and a lower opening. The height of the first wire hole 9 is twice the height of the second wire hole 10.

[0061] Based on the arrangement of the connecting frame 3, in order to fix the main cable 1 and improve the anti-vibration performance of the main cable 1, at least three annular air bags 4 are arranged inside the upper end of the connecting frame 3. A compression assembly 5 is arranged inside the upper end of the connecting frame 3 and compresses and fixes the main cable 1 by expanding the annular air bags 4. When the annular air bags 4 are compressed by external force, the volume of the gas inside the annular air bags 4 decreases and the pressure increases, converting kinetic energy into gas potential energy. In this way, the energy is stored by compressing the gas. The air bag material of the annular air bags 4 is rubber. The stored energy is slowly released by using the elastic restoring force of the annular air bags 4, reducing the impact peak. The annular air bags 4 are designed in a symmetrical annular manner, effectively avoiding stress concentration at a single point. The annular air bags 4 wrap the main cable 1 in a 360° full negative manner, effectively absorbing vibrations in all directions, thereby improving the anti-vibration performance of the main cable 1. The compression assembly 5 includes a gas pressure cavity 501, a mounting plate 502, a driving rod 503, and a first piston 504. The components are arranged as follows:

[0062] The air pressure cavity 501 is arranged on the inner wall of the first wire hole 9, one end of the air pressure cavity 501 is communicated with the annular air bag 4, the mounting plate 502 is fixed on the end of the air pressure cavity 501 away from the annular air bag 4, the sealing groove is arranged on the mounting plate 502, the driving rod 503 is screwed on the mounting plate 502, the stability of the pressing assembly 5 during operation is ensured by the threaded connection of the driving rod 503 and the mounting plate 502, the knob is fixed on the end of the driving rod 503 away from the mounting plate 502, the sealing soft pad corresponding to the sealing groove is fixed on the side of the knob close to the mounting plate 502, the sealing groove and the sealing soft pad are both annular structures, the sealing property between the knob and the mounting plate 502 is ensured by the mutual extrusion of the sealing groove and the sealing soft pad, which helps to avoid the contact between the oil stains or impurities and the threads on the driving rod 503, and helps to prolong the service life of the driving rod 503, the cross section of the sealing groove and the sealing soft pad is triangular structure, the first piston 504 slides in the air pressure cavity 501, and the first piston 504 is fixedly connected with the driving rod 503.

[0063] Based on the arrangement of the connecting frame 3, in order to realize the fixed connection of the main cable 1 and the branch cable 2, at least one elastic band 6 is arranged inside the lower end of the connecting frame 3, the elastic band 6 allows multiple tightness adjustment, which is convenient for quick disassembly or re-fixing during later maintenance, the elastic band 6 continuously provides uniform radial pressure, automatically compensates the size change of the cable caused by temperature change or vibration, prevents loosening, and the elastic band 6 can absorb cable vibration energy, and corrugations or particles are arranged on the surface of the elastic band 6 to increase the friction, prevent the main cable 1 and the branch cable 2 from slipping, and the elastic band 6 has no sharp edges, so as to avoid hard damage to the main cable 1 and the branch cable 2, and the elastic band 6 made of EPDM rubber or silicone has an insulation resistance ≥10 12 Ω, which can prevent accidental short circuit, at the same time, the elastic band 6 adds UV resistant agent and antioxidant, and the outdoor service life can reach 8 to 10 years, the binding assembly 7 for binding and fixing the main cable 1 and the branch cable 2 through the elastic band 6 is arranged inside the lower end of the connecting frame 3, the binding assembly 7 includes a mounting cavity 701, a traction rope 702, a support plate 703, a connecting plate 704, a reset spring 705 and a counterweight column 706, and the components are arranged as follows:

[0064] The installation cavity 701 is arranged at the lower end of the connecting frame 3, the traction rope 702 is movably arranged in the installation cavity 701 and fixedly connected with the elastic band 6, the supporting plate 703 is fixed on the inner wall of the installation cavity 701, the supporting plate 703 is provided with a movable hole for movably sleeving the traction rope 702, the connecting plate 704 is fixed on the upper end of the traction rope 702, the reset spring 705 is fixed between the supporting plate 703 and the connecting plate 704, the reset spring 705 is movably sleeved on the traction rope 702, the counterweight column 706 is fixed on the lower end of the traction rope 702, when the counterweight column 706 is not limited, it will move downward under the influence of gravity, and drive the traction rope 702 to move downward and tighten the elastic band 6, which helps to improve the bundling efficiency of the elastic band 6, when the counterweight column 706 is limited, the traction rope 702 moves upward under the elastic force of the reset spring 705, at this time, the elastic band 6 tends to move to the initial state under the action of its own elastic force, so as to complete the disassembly work of the main cable 1 and the branch cable 2, without tools, the disassembly and assembly work of the main cable 1 and the branch cable 2 can be completed, which helps to improve the construction efficiency of the workers.

[0065] Based on the arrangement of the connecting frame 3, in order to realize real-time monitoring of the humidity of the cable installation position, the humidity monitoring assembly 8 for detecting the humidity of the cable installation environment is arranged on the connecting frame 3, the humidity monitoring assembly 8 comprises a sliding rod 801, a closing plate 802, a mounting disc 803, a center shaft 804, a pointer 805, a storage frame 806, a second piston 807, a driving rack 808 and a driven gear 809, and each component is arranged as follows:

[0066] The sliding rod 801 slides on the connecting frame 3, the first sliding hole corresponding to the sliding rod 801 is formed on the top end of the connecting frame 3, the sliding rod 801 is located in the first sliding hole, which is the state when the cable is installed, the mounting disc 803 is arranged outside, the second sliding hole corresponding to the sliding rod 801 is formed on the lower side of the connecting frame 3, the sliding rod 801 is located in the second sliding hole, which is the state when the connecting frame 3 leaves the factory, so that the counterweight column 706 is not affected by gravity and slides downward, the closing plate 802 is fixed on the sliding rod 801, the mounting disc 803 is fixed on the closing plate 802, a plurality of marks for indicating the humidity size are arranged on the outer wall of the mounting disc 803, the end of the pointer 805 always corresponds to one of the marks, the center shaft 804 rotates on the mounting disc 803, the pointer 805 is fixed on the end of the center shaft 804 extending to the outside of the mounting disc 803, through the cooperation of the pointer 805 and the marks, the cable peripheral humidity environment data is obtained, so that the operation and maintenance personnel can more intuitively understand the cable peripheral humidity state, the storage frame 806 is fixed in the mounting disc 803, the PVA film is stored in the storage frame 806, the PVA film needs to be crosslinked and modified, so that the deformation or dissolution caused by excessive moisture absorption is reduced, the swelling rate of the crosslinked PVA film can be reduced from 20% to 8% under 80% RH, and the size stability is improved, the mounting disc 803 and the storage frame 806 are provided with microporous ceramics away from the second piston 807, so that the PVA film can be in contact with air, and impurities are prevented from entering the mounting disc 803, the second piston 807 slides in the storage frame 806 and is in movable abutment with the PVA film, the driving rack 808 is fixed on the second piston 807, the guide through hole for slidingly sleeving the driving rack 808 is formed on the storage frame 806, the driven gear 809 is fixed on the center shaft 804 and is in meshing connection with the driving rack 808, and it should be noted that the transmission ratio of the driving rack 808 and the driven gear 809 is determined by selecting the type according to the swelling rate of the PVA film in the actual use environment, and the specific selection mode is the existing known technology, so it is not described here.

[0067] The function principle of the present application can be described by the following operation mode:

[0068] Pull out the closing plate 802, so that the sliding rod 801 is separated from the second sliding hole, so that the closing plate 802 does not close the first wire hole 9 and the second wire hole 10, and the connecting frame 3 is placed on the workbench (or the second wire hole 10 is first blocked with the hand);

[0069] Insert the main cable 1 into the first wire hole 9, rotate the drive rod 503 to drive the first piston 504 to move towards the annular air bag 4, and press the gas in the gas cavity 501 to the annular air bag 4 through the first piston 504, so that the annular air bag 4 is inflated and the main cable 1 is fixed by extrusion, then insert the branch cable 2 into the second wire hole 10, and place the connecting frame 3 vertically, at this time the traction rope 702 is affected by the gravity of the counterweight column 706 and moves downward, the traction rope 702 drives the elastic band 6 to contract and bundle the main cable 1 and the branch cable 2, and the connecting plate 704 drives the reset spring 705 to be extruded, so that the reset spring 705 is contracted in structure;

[0070] Finally, insert the sliding rod 801 into the first sliding hole, and set the installation disc 803 exposed outside when installing the pre-branch cable, so as to facilitate the regular inspection of the maintenance personnel;

[0071] By using the moisture absorption and expansion characteristics of the PVA film, the second piston 807 is affected by the PVA film to drive the drive rack 808 to move horizontally, the driven gear 809 is affected by the drive rack 808 to rotate, the driven gear 809 drives the center shaft 804 to rotate, the center shaft 804 drives the pointer 805 to rotate, and cooperates with the marks on the installation disc 803, so as to facilitate the maintenance personnel to judge whether the humidity will affect the cable.

[0072] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A pre-branching cable comprising a main cable (1) and a branching cable (2), characterized in that, The main cable (1) is matched with the branch cable (2) and is provided with a connecting frame (3), the upper end of the connecting frame (3) is internally provided with at least three annular air bags (4), the connecting frame (3) is provided with a first wire hole (9) for movably sleeving the main cable (1), the upper end of the connecting frame (3) is internally provided with a compression assembly (5) for compressing and fixing the main cable (1) through the expansion of the annular air bag (4), and the compression assembly (5) comprises: A gas pressure cavity (501) is formed in the inner wall of the first wire hole (9) and is connected with the annular air bag (4); An installation plate (502) is fixed at the end of the gas pressure cavity (501) away from the annular air bag (4); A driving rod (503) is threadedly connected to the installation plate (502); A first piston (504) is slidably arranged in the gas pressure cavity (501) and is connected with the driving rod (503); A sealing groove is formed in the installation plate (502), a knob is fixed to the end of the driving rod (503) away from the installation plate (502), the side of the knob close to the installation plate (502) is fixed with a sealing soft pad arranged corresponding to the sealing groove, the sealing groove and the sealing soft pad are annular structures, and the cross sections of the sealing groove and the sealing soft pad are triangular structures; At least one elastic belt (6) is arranged in the lower end of the connecting frame (3), a binding assembly (7) is arranged in the lower end of the connecting frame (3) and is used for binding and fixing the main cable (1) and the branch cable (2) through the elastic belt (6), and a humidity monitoring assembly (8) is arranged on the connecting frame (3) and is used for detecting the humidity of the cable installation environment.

2. A pre-branching cable according to claim 1, characterized in that A second wire hole (10) is formed in the connecting frame (3) and is used for movably sleeving the branch cable (2), the first wire hole (9) is a through hole structure with an upper opening and a lower opening, and the height of the first wire hole (9) is twice the height of the second wire hole (10).

3. A pre-branching cable according to claim 1, characterized in that, The binding assembly (7) comprises: An installation cavity (701) is formed in the lower end of the connecting frame (3); A traction rope (702) is movably arranged in the installation cavity (701) and is fixedly connected with the elastic belt (6); A supporting plate (703) is fixed to the inner wall of the installation cavity (701); A connecting plate (704) is fixed to the upper end of the traction rope (702); A reset spring (705) is fixed between the supporting plate (703) and the connecting plate (704); A counterweight column (706) is fixed to the lower end of the traction rope (702).

4. A pre-branching cable according to claim 3, characterized in that An activity hole is formed in the supporting plate (703) and is used for movably sleeving the traction rope (702), and the reset spring (705) is movably sleeved on the traction rope (702).

5. A pre-branching cable according to claim 1, characterized in that The humidity monitoring assembly (8) comprises: A sliding rod (801) is slidably arranged on the connecting frame (3); A closing plate (802) is fixed to the sliding rod (801); An installation disc (803) is fixed to the closing plate (802); A central shaft (804) is rotatably arranged on the installation disc (803); A pointer (805) fixed on the center shaft (804) extending to the outside of the mounting disc (803); A storage frame (806) fixed in the mounting disc (803), in which PVA film is stored; A second piston (807) sliding in the storage frame (806) and in active abutment with the PVA film; A driving rack (808) fixed on the second piston (807); A driven gear (809) fixed on the center shaft (804) and in mesh with the driving rack (808).

6. A pre-branching cable according to claim 5, characterized in that A first sliding hole corresponding to the sliding rod (801) is formed on the top end of the connecting frame (3), and a second sliding hole corresponding to the sliding rod (801) is formed on the lower side of the connecting frame (3).

7. A pre-branching cable according to claim 5, characterized in that A plurality of marks for indicating the size of humidity are arranged on the outer wall of the mounting disc (803), and the end of the pointer (805) always corresponds to one of the marks.

8. A pre-branching cable according to claim 5, wherein, A microporous ceramic is arranged on the side of the mounting disc (803) and the storage frame (806) away from the second piston (807), and a guide through hole for slidingly sleeving the driving rack (808) is formed on the storage frame (806).

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