Pre-branched cable

Abstract

The invention relates to the technical field of cables, in particular to a pre-branch cable which comprises a main cable and a branch cable, a connecting frame is arranged on the main cable and the branch cable in a matched mode, and at least three annular air bags are arranged in the upper end of the connecting frame. A pressing assembly for pressing and fixing the main cable through an expansion annular air bag is arranged in the upper 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. The main cable is compressed and fixed through expansion of the annular air bag, so that the fitting degree between the annular air bag and the main cable is guaranteed, vibration in all directions is effectively absorbed by comprehensively wrapping the main cable, and the humidity detection accuracy is improved by taking a PVA film and a mechanical structure as humidity detection means. The problem that the electronic parts are aged or are affected by external force vibration to cause failure of the electronic parts is effectively avoided, and the humidity monitoring assembly is longer in service life compared with an electronic humidity sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and particularly to a pre-branched cable. Background Art

[0002] Prefabricated branched cables are cables with branches that are manufactured in the factory according to the main and branch cable models, specifications, cross-sections, lengths, branch positions, and other indicators required by cable users, using a series of special production equipment on the assembly line.

[0003] The existing pre-branched cables have the following defects in actual use:

[0004] The metal joints of the existing pre-branched cables are prone to electrochemical corrosion under high humidity conditions, resulting in an increase in the oxide layer thickness on the contact surface and a non-linear increase in the contact resistance, which in turn leads to local overheating or excessive leakage current. When the laying carrier deforms due to external forces or the seal fails and cracks occur, external liquid water or water vapor will penetrate along the cracks to the cable surface, forming a persistent high humidity microenvironment. Since the pre-branched cable adopts an embedded fixed installation structure, its branch nodes are completely encapsulated inside the carrier, and it is impossible to monitor the humidity parameters inside the carrier in real time through conventional inspection means, making it difficult for maintenance personnel to obtain early warning signals in a timely manner, resulting in the accumulation and amplification of potential safety hazards. Moreover, in the traditional cable branch connection, the waterproof tape wrapping process is used, and the physical stability of the tape fixing method is insufficient in earthquake-prone areas, becoming a high incidence point of line failures. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the prior art that it is impossible to monitor the humidity parameters inside the carrier in real time through conventional inspection means and the fixing stability is insufficient due to the influence of vibration on the tape adhesion, and to propose a pre-branched cable.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A pre-branched cable includes a main cable and a branch cable. A connection frame is provided on the main cable and the branch cable. At least three annular airbags are arranged inside the upper end of the connection frame. A pressing component is provided inside the upper end of the connection frame to press and fix the main cable by expanding the annular airbags. At least one elastic band is arranged inside the lower end of the connection frame. A bundling component is provided inside the lower end of the connection frame to bundle and fix the main cable and the branch cable by the elastic band. A humidity monitoring component for detecting the humidity of the cable installation environment is installed on the connection 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 in the connecting frame. The first wire hole is a through hole structure with openings at both the upper and lower ends, and the height value of the first wire hole is twice that of the second wire hole.

[0009] Preferably, the pressing assembly includes:

[0010] An air pressure chamber formed on the inner wall of the first wire hole and communicating with the annular airbag;

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

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

[0013] A first piston slidably disposed in the air pressure chamber and connected to the driving rod.

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

[0015] Preferably, the bundling assembly includes:

[0016] Mounting cavities formed on both sides at the lower end of the connecting frame;

[0017] A traction rope movably disposed 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 at 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 at the lower end of the traction rope.

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

[0023] Preferably, the humidity monitoring assembly includes:

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

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

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

[0027] The central shaft rotatably mounted on the mounting disc;

[0028] The pointer fixed at one end of the central shaft extending outside the mounting disc;

[0029] The storage frame fixed in the mounting disc, and a PVA film is stored in the storage frame;

[0030] The second piston slidably mounted in the storage frame and movably abutted against the PVA film;

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

[0032] The driven gear fixed on the central shaft and meshed with the driving rack.

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

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

[0035] Preferably, a microporous ceramic is provided on the side of the mounting disc and the storage frame away from the second piston, and a guiding through hole for slidably sleeving the driving rack is formed on the storage frame.

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

[0037] 1. In the present invention, the main cable is tightly fixed by the expansion of the annular airbag, so as to ensure the degree of fit between the annular airbag and the main cable. By comprehensively wrapping the main cable, vibrations in all directions can be effectively absorbed. At the same time, the stored energy is slowly released by the elastic restoring force of the annular airbag, reducing the impact peak value.

[0038] 2. In the present invention, the main cable and the branch cable are bundled and fixed by the tightening of the elastic band. At the same time, the elastic band can be automatically tightened in cooperation with the counterweight column, greatly shortening the construction time. Moreover, the elastic band allows multiple tightening and loosening adjustments, facilitating quick disassembly or re-fixing during later maintenance. At the same time, the elastic band continuously provides uniform radial pressure, automatically compensating for the slight dimensional changes of the cable caused by temperature changes or vibrations, preventing loosening.

[0039] 3. In the present invention, the volume after moisture absorption and expansion of the PVA film is utilized to drive the driving rack and the driven gear to operate, causing the pointer to rotate. In cooperation with the marks made on the mounting plate, the humidity environment is digitalized. Moreover, by using the PVA film and the mechanical structure as the humidity detection means, the problem that the electronic components fail due to aging or being affected by external force vibration is effectively avoided, 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 It is a schematic diagram of the ex-factory state of the connecting frame proposed by the present invention;

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

[0043] Figure 4 For the present invention Figure 3 The sectional view proposed therein;

[0044] Figure 5 For the present invention Figure 4 The partial enlarged structure schematic diagram of A proposed therein;

[0045] Figure 6 For the present invention Figure 4 The partial enlarged structure schematic diagram of B proposed therein;

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

[0047] Figure 8 For the present invention Figure 7 The sectional view proposed therein.

[0048] In the figure:

[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. Driving rod; 504. First piston;

[0054] 6. Elastic band;

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

[0056] 8. Humidity monitoring component; 801. Sliding rod; 802. Sealing plate; 803. Mounting disc; 804. Central axis; 805. Pointer; 806. Storage frame; 807. Second piston; 808. Driving rack; 809. Driven gear;

[0057] 9. First wire hole;

[0058] 10. Second wire hole. Specific implementation manner

[0059] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0060] Referring to Figures 1 - 8 , a pre-branched cable includes a main cable 1 and a branched cable 2. A connecting frame 3 is provided on the main cable 1 and the branched cable 2. 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 branched cable 2. The first wire hole 9 is a through-hole structure with upper and lower openings, and the height value of the first wire hole 9 is twice the height value of the second wire hole 10.

[0061] Based on the setting of the connecting frame 3, in order to realize the fixing operation of the main cable 1 and improve the anti-vibration performance of the main cable 1, at least three annular air bags 4 are provided inside the upper end of the connecting frame 3, and a pressing component 5 for pressing and fixing the main cable 1 by expanding the annular air bags 4 is provided inside the upper end of the connecting frame 3. When the annular air bag 4 is compressed by an external force, the volume of the internal gas decreases and the pressure increases, converting kinetic energy into gas potential energy, thereby realizing gas compression energy storage. At the same time, the air bag material of the annular air bag 4 is rubber, and the stored energy is slowly released by the elastic restoring force of the annular air bag 4, reducing the impact peak value. And the annular symmetric design effectively avoids single-point stress concentration. At the same time, by wrapping the main cable 1 in a 360° full negative manner, vibrations in all directions are effectively absorbed, thereby improving the anti-vibration performance of the main cable 1. The pressing component 5 includes a pneumatic cavity 501, a mounting plate 502, a driving rod 503 and a first piston 504, and the components are arranged as follows:

[0062] The air pressure chamber 501 is opened on the inner wall of the first wire hole 9. One end of the air pressure chamber 501 is communicated with the annular airbag 4. The mounting plate 502 is fixed on the end of the air pressure chamber 501 away from the annular airbag 4. A sealing groove is opened on the mounting plate 502. The driving rod 503 is threadedly connected to the mounting plate 502. The threaded connection between the driving rod 503 and the mounting plate 502 ensures the stability of the pressing assembly 5 during operation. A knob is fixed on the end of the driving rod 503 away from the mounting plate 502. A sealing soft pad corresponding to the sealing groove is fixed on the side of the knob close to the mounting plate 502. Both the sealing groove and the sealing soft pad are annular structures. The mutual extrusion between the sealing groove and the sealing soft pad ensures the sealing between the knob and the mounting plate 502, which helps to prevent oil stains or impurities from contacting the threads on the driving rod 503 and helps to extend the service life of the driving rod 503. The cross-sections of the sealing groove and the sealing soft pad are both triangular structures. The first piston 504 slides in the air pressure chamber 501, and the first piston 504 is fixedly connected to the driving rod 503.

[0063] Based on the setting 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 tightening and loosening adjustments, which is convenient for quick disassembly or re-fixing during later maintenance. The elastic band 6 continuously provides uniform radial pressure, automatically compensates for the slight dimensional changes of the cable caused by temperature changes or vibrations, prevents loosening, and the elastic band 6 can absorb the vibration energy of the cable. Corrugations or particles are arranged on the surface of the elastic band 6 to increase the friction force and prevent the main cable 1 and the branch cable 2 from slipping. Moreover, the elastic band 6 has no sharp edges to avoid causing hard damage to the main cable 1 and the branch cable 2. The elastic band 6 made of EPDM rubber or silica gel has an insulation resistance ≥ 10 12 Ω, which can prevent accidental short circuits. At the same time, the elastic band 6 is added with anti-UV agents and antioxidants, and its outdoor service life can reach 8 to 10 years. A bundling assembly 7 for bundling 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 bundling assembly 7 includes a mounting cavity 701, a traction rope 702, a support plate 703, a connecting plate 704, a return spring 705 and a counterweight column 706. The settings of each component are as follows:

[0064] The installation cavities 701 are formed on both sides of the lower end of the connecting frame 3. The towing ropes 702 are movably arranged in the installation cavities 701 and fixedly connected to the elastic bands 6. The support plates 703 are fixed on the inner walls of the installation cavities 701. Activity holes for movably sleeving the towing ropes 702 are formed in the support plates 703. The connecting plates 704 are fixed to the upper ends of the towing ropes 702. The return springs 705 are fixed between the support plates 703 and the connecting plates 704. The return springs 705 are movably sleeved on the towing ropes 702. The counterweight columns 706 are fixed to the lower ends of the towing ropes 702. When the counterweight columns 706 are not restricted, they will move downward under the influence of gravity, and at the same time drive the towing ropes 702 to move downward and tighten the elastic bands 6, which helps to improve the bundling efficiency of the elastic bands 6. When the counterweight columns 706 are restricted, the towing ropes 702 move upward under the elastic force of the return springs 705. At this time, the elastic bands 6 move towards the initial state under their own elastic force, so as to complete the disassembly operation of the main cable 1 and the branch cable 2. The disassembly and assembly operations of the main cable 1 and the branch cable 2 can be completed without tools, which helps to improve the construction efficiency of the staff.

[0065] Based on the setting of the connecting frame 3, in order to realize the real-time monitoring of the humidity condition of the cable installation position, a humidity monitoring component 8 for detecting the humidity of the cable installation environment is installed on the connecting frame 3. The humidity monitoring component 8 includes a sliding rod 801, a closing plate 802, an installation disc 803, a central shaft 804, a pointer 805, a storage frame 806, a second piston 807, a driving rack 808 and a driven gear 809. The settings of each component are as follows:

[0066] The sliding rod 801 slides on the connecting frame 3. A first sliding hole corresponding to the sliding rod 801 is formed at the top of the connecting frame 3. When the sliding rod 801 is located in the first sliding hole, it is the state when the cable installation is completed, and the mounting plate 803 is exposed. A second sliding hole corresponding to the sliding rod 801 is formed on the lower side of the connecting frame 3. When the sliding rod 801 is located in the second sliding hole, it is the state when the connecting frame 3 leaves the factory, so as to ensure that the counterweight column 706 does not slide down under the influence of gravity. The closing plate 802 is fixed on the sliding rod 801, and the mounting plate 803 is fixed on the closing plate 802. A plurality of marks for indicating the humidity level are provided on the outer wall of the mounting plate 803. The end of the pointer 805 always corresponds to one of the marks. The central shaft 804 rotates on the mounting plate 803. The pointer 805 is fixed to one end of the central shaft 804 extending outside the mounting plate 803. Through the cooperation of the pointer 805 and the marks, the humidity environment data around the cable is digitized, so that the maintenance personnel can more intuitively understand the humidity state around the cable. The storage box 806 is fixed in the mounting plate 803, and a PVA film is stored in the storage box 806. The PVA film needs to be crosslinked and modified to reduce the deformation or dissolution caused by excessive moisture absorption, so that the swelling rate of the crosslinked PVA film can be reduced from 20% to 8% at 80% RH, improving the dimensional stability. A microporous ceramic is provided on one side of the mounting plate 803 and the storage box 806 away from the second piston 807, so that the PVA film can contact the air while preventing impurities from entering the mounting plate 803. The second piston 807 slides in the storage box 806 and is in movable contact with the PVA film. The driving rack 808 is fixed on the second piston 807. A guiding through hole for slidably sleeving the driving rack 808 is formed on the storage box 806. The driven gear 809 is fixed on the central shaft 804 and meshes with the driving rack 808. It should be noted that: the transmission ratio of the driving rack 808 and the driven gear 809 needs to be selected according to the swelling rate generated by the PVA film in the actual use environment. The specific selection method is the prior art and will not be elaborated here.

[0067] The functional principle of the present invention can be described through the following operation modes:

[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 no longer closes the first wire hole 9 and the second wire hole 10, and place the connecting frame 3 flat on the workbench (or first block the second wire hole 10 with your 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 airbag 4, and squeeze the gas in the air pressure chamber 501 into the annular airbag 4 through the first piston 504, so that the annular airbag 4 expands and squeezes and fixes the main cable 1. Then insert the branch cable 2 into the second wire hole 10, place the connecting frame 3 vertically. At this time, the towing rope 702 moves downward under the influence of the gravity of the counterweight column 706. The towing rope 702 drives the elastic band 6 to contract and bundle the main cable 1 and the branch cable 2. The towing rope 702 drives the connecting plate 704 to squeeze the return spring 705, causing the return spring 705 to contract structurally;

[0070] Finally, insert the sliding rod 801 into the first sliding hole. When installing the pre-branched cable, the installation disk 803 is exposed for easy regular inspection by the operation and maintenance personnel;

[0071] Utilize the property of the PVA film to absorb moisture and expand, so that the second piston 807 drives the drive rack 808 to move horizontally under the influence of the PVA film. The driven gear 809 rotates under the influence of the drive rack 808. The driven gear 809 drives the central shaft 804 to rotate, and the central shaft 804 drives the pointer 805 to rotate, and cooperate with the markings on the installation disk 803 to facilitate the operation and maintenance personnel to judge whether the humidity condition will affect the cable.

[0072] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A pre-branched cable, comprising a main cable (1) and a branched cable (2), characterized in that, A connecting frame (3) is provided in a matching manner on the main cable (1) and the branch cable (2). At least three annular air bags (4) are arranged inside the upper end of the connecting frame (3). A pressing assembly (5) for pressing and fixing the main cable (1) by expanding the annular air bags (4) is arranged inside the upper end of the connecting frame (3). At least one elastic band (6) is arranged inside the lower end of the connecting frame (3). A bundling assembly (7) for bundling and fixing the main cable (1) and the branch cable (2) by the elastic band (6) is arranged inside the lower end of the connecting frame (3). A humidity monitoring assembly (8) for detecting the humidity of the cable installation environment is installed on the connecting frame (3).

2. The pre-branched cable according to claim 1, characterized in that, 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) are formed in the connecting frame (3). The first wire hole (9) is a through-hole structure with openings at both the upper and lower ends, and the height value of the first wire hole (9) is twice the height value of the second wire hole (10).

3. A pre-branched cable according to claim 2, characterized in that, The pressing assembly (5) includes: An air pressure chamber (501) formed on the inner wall of the first wire hole (9) and communicating with the annular air bag (4); A mounting plate (502) fixed at one end of the air pressure chamber (501) away from the annular air bag (4); A driving rod (503) threadedly connected to the mounting plate (502); A first piston (504) sliding in the air pressure chamber (501) and connected to the driving rod (503).

4. The pre-branched cable according to claim 3, characterized in that, A sealing groove is formed in the mounting plate (502). A knob is fixed at one end of the driving rod (503) away from the mounting plate (502). A sealing soft pad corresponding to the sealing groove is fixed on one side of the knob close to the mounting plate (502). Both the sealing groove and the sealing soft pad are annular structures, and the cross-sections of both the sealing groove and the sealing soft pad are triangular structures.

5. A pre-branched cable according to claim 1, characterized in that, The bundling assembly (7) includes: Mounting cavities (701) formed on both sides of the lower end of the connecting frame (3); A towing rope (702) movably arranged in the mounting cavity (701) and fixedly connected to the elastic band (6); A support plate (703) fixed on the inner wall of the mounting cavity (701); A connecting plate (704) fixed at the upper end of the towing rope (702); A return spring (705) fixed between the support plate (703) and the connecting plate (704); A counterweight column (706) fixed at the lower end of the towing rope (702).

6. The pre-branched cable according to claim 5, characterized in that, An activity hole for movably sleeving the towing rope (702) is formed in the support plate (703), and the return spring (705) is movably sleeved on the towing rope (702).

7. The pre-branched cable according to claim 1, characterized in that, The humidity monitoring assembly (8) includes: A sliding rod (801) sliding on the connecting frame (3); A closing plate (802) fixed on the sliding rod (801); A mounting disk (803) fixed on the closing plate (802); A central shaft (804) rotating on the mounting disk (803); A pointer (805) fixed to the outer end of the mounting disk (803) where the central axis (804) extends out; A storage frame (806) fixed in the mounting disk (803), and a PVA film is stored in the storage frame (806); A second piston (807) sliding in the storage frame (806) and in movable contact with the PVA film; A driving rack (808) fixed to the second piston (807); A driven gear (809) fixed to the central axis (804) and meshing with the driving rack (808).

8. A pre-branched cable according to claim 7, characterized in that, A first sliding hole corresponding to the sliding rod (801) is formed at the top end of the connecting frame (3), and a second sliding hole corresponding to the sliding rod (801) is formed at the lower side of the connecting frame (3).

9. A pre-branched cable according to claim 7, characterized in that, A plurality of marks for indicating the humidity level are provided on the outer wall of the mounting disk (803), and the end of the pointer (805) always corresponds to one of the marks.

10. A pre-branched cable according to claim 7, characterized in that, A microporous ceramic is provided on the side of the mounting disk (803) and the storage frame (806) away from the second piston (807), and a guiding through hole for slidably sleeving the driving rack (808) is formed on the storage frame (806).

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