HK1148121A - Telecommunication cable splice enclosure having the elasticity shrinkable tube-shrinkable waterproof mechanism - Google Patents

Description

Communication cable connection box with elastic rubber contraction tube waterproof device

Technical Field

The invention relates to a communication cable splice closure with a waterproof device of an elastic rubber shrinkage tube, in particular to a communication cable splice closure with a waterproof device of an elastic rubber shrinkage tube, which has simple, convenient and safe construction, does not need to use tools or fire sources, has wide outer diameter of applicable cables, and can solve the problem that when a heat shrinkage tube for waterproofing a cable inlet and a cable outlet is baked by fire in the prior art, the heat shrinkage tube which is adjacent to the baked cable splice closure is heated again to be softened and loosened to cause water leakage of the splice closure.

Background

Cable laying in various countries of the world is required to be underground as much as possible, the cable laying is mainly in a pipeline laying mode, cable junction boxes for cables connected with underground pipelines are placed in manholes and hand holes of the underground cable pipelines, a large amount of water is accumulated in the manholes and the hand holes all year round, and the junction boxes placed in the cable junction boxes are soaked in water all year round. Fig. 1 shows a schematic cross-sectional view of a pipeline with a cable closure deployed in the underground. In fig. 1, manhole covers 11 and 12 are provided with manhole holes 111 and 121 at the lower part thereof, cable closures 13 and 14 are placed in the manhole holes 111 and 121, the cable closures 13 and 14 are connected by cables 16, and the cable closures 13 and 14 are connected to other cable closures (not shown) by cables 15 and 17, respectively. In practice, the cables 15, 16, 17 in the manholes 111, 121 are coiled. In the case of a cable closure for an electrical cable or an optical cable, if the waterproof effect is not good, the leakage of water in a manhole or a hand hole into the cable closure will affect the transmission quality of the cable and accelerate the degradation of the cable, resulting in the transmission failure of the cable and the reduction of the service life of the cable.

In the prior art, heat-shrinkable cable closures have been widely used for many years in the technical fields of cable laying and connection in various cable transmission industries such as telecommunications, cable television, monitoring systems, and the like. Although the heat-shrinkable cable closure has many advantages such as low manufacturing cost, wide range of applicable cable outer diameter, and easy and fast operation, it is widely used in the industry, but the problem of easy water leakage of the heat-shrinkable cable closure is a disadvantage. Fig. 2(a) is a top view of a prior art heat shrinkable cable closure. In fig. 2(a), the cable access end 21 of the heat shrinkable cable closure 20 (abbreviated as closure) has hollow columns 22, 23A, 23B, 23C, 23D, 23E, and main cables 24A, 24B are routed through the hollow columns 22 into the closure 20, with the main cables 24A, 24B being spaced apart by a heat shrinkable bifurcated clamp 29. The breakout cables 25A, 25B, 25C, 25D, 25E pass through the hollow columns 23A-23E, respectively, into the closure 20. Fig. 2(B) and (C) are schematic views illustrating a waterproof structure of a prior art heat shrinkable cable closure. In fig. 2(B) and (C), a heat-shrinkable cable closure 30 (simply referred to as a closure) is composed of at least a cover 22, a cable entry/exit end face 31, and hollow columns 32, 33A, 33B. The user first penetrates the main cables 24A, 24B into the hollow pipe column 32 sleeved with the heat shrinkable tube 36 and enters the splice closure through the opening 38A, the main cables 24A, 24B are spaced by the branch clamp for the heat shrinkable tube, and then the heat shrinkable tube 36 and the branch clamp are baked by fire, so that the water-proof treatment of the main cables 24A, 24B on the cable inlet and outlet end faces of the splice closure is completed. The branch cable 35B is inserted into the hollow pipe column 33B sleeved with the heat shrinkable tube 37 and enters the splice closure through the opening 38B, and then the heat shrinkable tube 33B is baked by fire, so as to complete the waterproof treatment of the branch cable 35B on the cable inlet and outlet end faces of the splice closure. The junctions of the trunk cables 24A, 24B and the branch cable 35B are housed in the cable junction tray 39. However, when the heat shrinkable tube 37 is fired, the heat shrinkable tube 36 adjacent to the heat shrinkable tube 37 after firing is softened and loosened by reheating, and the closure 30 leaks water. Similarly, when the heat shrinkable tubes of the other cable ports 33A are baked, the adjacent baked heat shrinkable tubes are softened and loosened by heating again, which may cause water leakage in the closure 30.

For example, cable access ports of a telecommunications cable closure, which typically provide more than 6 cables to access, are typically as large as 15 cm to 20 cm or less in diameter, and are thus located in close proximity to each other at each cable access port. Therefore, in the current waterproof technology for cable inlets and outlets of a heat-shrinkable cable closure, after the heat-shrinkable tube of the first cable inlet and outlet is baked with fire, and then the heat-shrinkable tubes of other cable inlets and outlets are baked with fire, the heat-shrinkable tubes adjacent to the baked cable inlets and outlets are heated again to soften and loosen, which often causes the problem of water leakage of the closure. This drawback is a problem that is most troubling and urgently solved in the existing heat-shrinkable cable closure.

Taking taiwan telecommunication industry as an example, as the trend of broadband optical fiber service has been, the china telecommunication companies have distributed optical cables and used a large number of cable splicing boxes to connect optical cables on a large scale in recent years, and it is announced that 300 billion, 1,500 billion total new tai-chou money is invested every year for the foundation construction of optical fiber networks beginning in 2009 every year, which is 5 years continuously. In recent years, the heat-shrinkable cable closure, which is placed in manholes and handholes for connecting optical cables, has a serious water leakage rate of over half. Because the problem of water leakage of the thermal contraction type cable splice closure is not solved, the company has to purchase a mechanical cable splice closure with a price 3 times higher than that of the thermal contraction type cable splice closure day by day, and uses sealing methods of various mechanical structures as waterproof structures for cable inlets and outlets, and the waterproof structures for cable inlets and outlets are applicable to the problems of small cable outer diameter range, various and complicated parts, complicated construction procedures, use of various tools, inconvenience in construction, high cost and the like. Therefore, if the deficiency and waterproof function of the heat-shrinkable cable splice closure can be improved, the problem that the water leakage of the heat-shrinkable cable splice closure affects the line quality can be avoided, and the investment cost of the manufacturer can be greatly reduced.

Disclosure of Invention

In order to overcome the defects of the prior art, an object of the present invention is to provide a communication cable connection box with a waterproof device having an elastic rubber shrinkage tube, wherein the cable connection box includes a protective cover and at least one cable inlet/outlet end surface and at least one elastic rubber shrinkage tube, and the cable inlet/outlet end surface has at least one hollow tubular column for at least one cable passing through the at least one hollow tubular column to enter/exit the cable connection box. When the waterproof treatment is carried out on the cable inlet and the cable outlet, an elastic rubber shrinkage pipe (a shrinkage pipe for short) is sleeved outside the hollow pipe column, the cable sequentially passes through the shrinkage pipe and the hollow pipe column to enter the splice box, the plastic strip coiled on the inner wall of the shrinkage pipe is removed, and after the plastic strip is removed, the shrinkage pipe tightly wraps the hollow pipe column and a part of the cable which does not pass through the hollow pipe column.

The retractable pipe is a hollow synthetic rubber pipe with abundant elasticity and ductility, a flexible hard plastic strip coiled into a threaded pipe shape is paved on the hollow inner wall of the rubber pipe in advance, the hollow aperture of the rubber pipe is enlarged, and the hollow aperture of the retracted pipe after being enlarged is larger than the outer diameters of the hollow pipe column and a cable which is about to pass through the hollow pipe column. When the plastic strip is removed, the expanded hollow aperture is immediately elastically contracted and restored to be close to the smaller aperture before being expanded, and the smaller aperture is smaller than the outer diameters of the hollow pipe column and the cable penetrating through the hollow pipe column. So that the exterior of the hollow pipe column and a part of the cable which does not penetrate into the hollow pipe column are tightly wrapped by the shrinkage pipe to form a waterproof structure. The waterproof structure can solve the problem that in the prior art, after the heat-shrinkable cable splice closure is baked by fire to complete the waterproof heat-shrinkable tube for the cable inlet and outlet, and then the heat-shrinkable tubes for the other cable inlet and outlet are baked by fire, the adjacent baked heat-shrinkable tubes are heated again to be softened and loosened, so that the splice closure leaks water. The invention has the advantages of simple and safe construction, no need of using tools and fire sources, wide applicable cable outer diameter and the like, and can greatly reduce the investment cost of an operator.

The communication cable junction box can be applied to three different forms of communication cable junction such as straight line junction, branch junction and midway lead-in branch junction. Taking the existing thermal shrinkage type cable splice closure as an example, when performing straight-line splicing and branching splicing operations, the main cable and/or the branch cable can pass through the hollow column of the splice closure by a single cable and enter the splice closure for splicing operations. When the midway leading and branching connection operation is carried out, the main cable is bent under the condition of no cutting, passes through the hollow column in the form of double cables and enters the connection box to carry out the midway leading and branching connection operation, but the connection of the branching cable is still carried out by that a single cable passes through the hollow column and enters the connection box to carry out the connection operation. Therefore, when the intermediate connection and branching operation is performed, the elastic rubber shrinkage tube cannot perform effective waterproofing treatment on the groove between the two cables unless the cross sections of the two cables of the main cable to be subjected to intermediate connection and branching operation are trimmed into a circle, an ellipse or a polygon without a groove in a proper manner.

Because of the use of the communication cable junction box, the trunk cable is introduced first, and then the branch cable is introduced. Therefore, when the invention is applied to the midway leading and branching connection operation, the waterproof operation of leading two main cables into the hollow tubular columns at the cable inlet and the cable outlet of the connection box can use the heat-shrinkable tube for waterproof treatment, and the waterproof operation of the branching cable still adopts the elastic rubber shrinkable tube for waterproof treatment. The first cable inlet and outlet when the main cable is introduced is firstly baked by using a heat shrink tube to complete waterproof treatment, and then other branch cables are introduced, the elastic rubber shrink tube is used for waterproof treatment, and the elastic rubber shrink tube is used for waterproof treatment, so that the problem that the adjacent baked heat shrink tube is heated again to soften and loosen when the heat shrink tubes of other cable inlets and outlets are baked by using fire after the heat shrink tube for waterproof treatment of the first cable inlet and outlet in the prior art is completely baked is avoided, and the problem of water leakage of the junction box is caused.

After studying the heat-shrinkable cable closure with water leakage, the inventor finds that the reason of the water leakage of the closure is two: firstly, the waterproof structure at the joint of the protective cover and the inlet and outlet end faces of the cable is poor; the second is caused by the loosening of the connecting part between the outer part of the hollow pipe column and the heat shrinkable tube and the connecting part between the cable and the heat shrinkable tube. Therefore, even if the water leakage problem of the waterproof structure at the joint of the protective cover and the cable inlet and outlet end face is improved, a plurality of splice boxes continue to leak water.

For the second reason, after the splice box is subjected to the heat-shrinkable waterproof operation, the cable may be twisted, bent and/or stressed when the splice box is moved into/out of the access hole or the hand hole for cable splicing, branching and leading out, maintenance and other operations, so that the waterproof portion of the heat-shrinkable tube is loosened, thereby causing water leakage of the splice box. Generally, most of the cable coating is polyethylene, but the adhesion strength between the thermosol used to coat the adhered cable and the polyethylene coating of the cable is limited, and the cable is easily loosened by twisting, bending and/or stress.

In order to overcome the disadvantages of the prior art, as a result of intensive studies by the present inventors, the present invention further provides at least one cable fixing device mounted outside the closure, the cable fixing device comprising: a first fixing part and a second fixing part. The first fixing portion is fixed on the splice closure, the second fixing portion is connected to the first fixing portion, and the second fixing portion fixes the cable to be introduced into the splice closure. The cable fixing device further comprises a supporting part which is connected with the first fixing part and the second fixing part. The cable fixing device is made of materials such as metal, plastic and combination thereof which are firm and are not easy to bend and deform. After the cable fixing device fixes the cable, the cable subjected to the waterproof treatment of the heat shrinkable tube is twisted and bent by moving the splice closure, but the fulcrum of the twisted and bent cable and the stress is the second fixing part of the cable fixing device. Because the waterproof part covered and connected by the heat shrinkable tube is positioned between the first fixing part and the second fixing part, the heat shrinkable tube cannot be loosened due to twisting and bending of the cable and the influence of stress.

The cable fixing device is not only used for fixing the cable subjected to the waterproof treatment by the heat shrinkable tube, but also used for fixing the cable subjected to the waterproof treatment by the elastic rubber shrinkable tube. The first fixing part of the cable fixing device can be integrally formed or embedded on the inlet and outlet end faces of the cable, and can also be fixed on the junction box in a fixing mode such as a screw joint mode, a bamboo joint mode, a tight-binding clamp mode, a tight-binding ring mode, a tight-binding belt mode and the like. The second fixing portion can be integrally formed with the first fixing portion or mechanically connected and fixed to the first fixing portion. The introduced cable can be fixed on the second fixing part in a fixing mode of a tightening clamp, a tightening ring, a tightening belt and the like. The supporting portion, the first fixing portion and the second fixing portion are integrally or mechanically connected to each other, the first end of the supporting portion is connected and fixed to the first fixing portion, the second end of the supporting portion is used for fixing a cable to be introduced, and the cable to be introduced can be fixed to the second end of the supporting portion in a fixing mode of a tightening clamp, a tightening ring, a tightening belt and the like. The cable section which is not covered by the shrinkage tube or the heat shrinkable tube, the cable section which is covered by the shrinkage tube or the heat shrinkable tube and the joint of the two parts can be fixed by the cable fixing device. The cable in the junction box can also be fixed by the cable fixing device disclosed by the invention.

Drawings

Fig. 1 is a schematic cross-sectional view of a pipeline with a cable closure deployed in the underground.

Fig. 2(a) is a top view of a prior art heat shrinkable cable closure.

Fig. 2(B) is a schematic view of a waterproof structure of a prior art heat shrinkable cable closure.

Fig. 2(C) is a schematic view of a cable introducing heat shrinkable cable closure of the prior art being treated for waterproofing.

FIG. 3(A) is a schematic view of an elastic rubber shrinkable tube used in example 1 of the present invention.

Fig. 3(B) is a schematic view of a telecommunication cable closure with a waterproof device of an elastic rubber shrink tube in embodiment 1 of the present invention.

Fig. 4 is a schematic view of a telecommunication cable closure with a waterproof device of an elastic rubber shrink tube according to embodiment 2 of the present invention.

Fig. 5 is a schematic view of a cable fixing device of a telecommunication cable closure according to embodiment 3 of the present invention.

In the figure:

FIG. 1 shows a schematic view of a

11. 12 manhole covers 13, 14 cable splice closure

111. 121 manhole 15, 16, 17 cable

FIG. 2(A)

20 heat-shrinkable cable splice closure

21 cable entry and exit end face

22 hollow tubular column

23A, 23B, 23C, 23D, 23E hollow columns

24A, 24B trunk cable

25A, 25B, 25C, 25D, 25E branch cable

29 bifurcation clip

FIG. 2(B), (C)

22 shield 35B cable

24A, 24B main cable 36, 37 heat shrink tube

30 heat shrink cable closure 38A, 38B hollow column openings

31 cable inlet and outlet end face 39 cable connection distributing disk

32. 33A, 33B hollow column

FIG. 3(A)

40 elastic rubber shrinkable tube 42 hard polyethylene plastic strip

First end of 41-ethylene propylene rubber tube 421

411 first opening 422 second end

412 second opening

FIG. 3(B)

Second opening of 50 telecommunication cable splice enclosure 562

51 cable entry and exit end face 57 plastic strip

52. 53 hollow column 571 first end

54. 55 Cable 572 second end

56 elastic rubber shrink tube 58 elastic rubber shrink tube

561 first opening

FIG. 4

58 elastic rubber shrinkage tube 57 plastic strip

First opening of 60 telecommunication cable closure 701

61 cable access port 702 second opening

62 protective cover 711 first end

63. 64, 65 hollow tubing string 712 second end

66. 67 cable 73 heat shrinkable tube

68. 69 trunk cable 74 bifurcation clamp

70 elastic rubber shrinkage pipe

FIG. 5

80 communication cable junction box 94 tight-bundle clamp

81 cable in-out end surface 95 clip

82 shield 96 screw

83. 84, 85 hollow columns 93, 97 support

86. 87 divergence cable 93A, 98 first fixing part

88. 89 trunk cable 99 screw

90. 91 second fixing part of shrinkable tube 93B, 100

92 heat shrinkable tube 101 tightening ring

Detailed Description

The communication cable junction box with the elastic rubber shrinkage tube waterproof device provided by the invention is described below by combining the accompanying drawings and embodiments.

Example 1

FIG. 3(A) is a schematic view of an elastic rubber shrinkable tube used in example 1 of the present invention. In fig. 3(a), the elastic rubber shrink tube 40 (abbreviated as shrink tube) is composed of an Ethylene Propylene Rubber (EPR) tube 41 (hereinafter, rubber tube) with elasticity and ductility and a hard polyethylene plastic strip 42 (hereinafter, plastic strip), wherein the rubber tube 41 has a first opening 411 and a second opening 412, and the plastic strip 42 has a first end 421 and a second end 422. A flexible plastic strip 42 is spirally wound around the hollow inner wall of the rubber tube 41 in advance, and the plastic strip 42 enlarges the hollow aperture of the rubber tube 41, and the hollow aperture is larger than the outer diameter of the hollow column of the cable closure and the outer diameter of the cable. The plastic strip 42 is ultrasonically spot welded every 5 cm to increase the tubular strength of the plastic strip 42 and to provide the plastic strip 42 with the property that the weld can be torn apart by hand. The plastic strip 42 may be a flexible rubber strip or metal strip that can enlarge the hollow diameter of the rubber tube 41.

Fig. 3(B) is a schematic view of a telecommunication cable closure with a waterproof device of an elastic rubber shrink tube according to embodiment 1 of the present invention. In fig. 3(B), a communication cable closure 50 (hereinafter referred to as a closure) is composed of at least a cable access end surface 51, a cover, hollow columns 52, 53 and an elastic rubber shrink tube 56, wherein the hollow columns 52, 53 have an opening (not shown) on the cable access end surface 51 for a cable to pass through the end surface to enter and exit the interior of the closure 50. The connection box 50 can be used for connecting two different types of cables in a straight line connection and a split connection. When the joint of the splice closure 50 and the cable is waterproof, the first opening 561 of the elastic rubber shrink tube 56 (hereinafter referred to as shrink tube) is sleeved into the hollow pipe column 52, and the cable 54 sequentially passes through the second opening 562 of the shrink tube 56, the hollow pipe column 52, and enters the interior of the splice closure 50. Then, the first end 571 of the plastic strip 57 passing through the second opening 562 is removed, and the hollow aperture expanded by the plastic strip is immediately contracted to return to a smaller aperture close to the aperture before being expanded. And the smaller bore diameter is smaller than the outer diameter of the hollow pipe column and the outer diameter of the cable. When the plastic strip 57 is continuously removed until the second end 572 of the plastic strip is separated from the shrink tube 56, the shrink tube 56 tightly covers the hollow stem 52 and a portion of the cable 54, thereby completing the waterproofing of the closure 50, as also shown in fig. 3(B), the shrink tube 58 tightly covers the hollow stem 53 and a portion of the cable 55 after the plastic strip (not shown) is removed, thereby completing the waterproofing of the closure cable inlet/outlet.

The method of embodiment 1 of the present invention can effectively and individually waterproof each cable in and out of the closure, not only does not need (or does not need) to bake the shrink tube with fire, but also the user can tightly wrap the shrink tube around the hollow tube column and part of the cable by only manually removing the plastic strip without using tools. Furthermore, the shrinkage pipe has flexibility, when the splice closure which is waterproof is placed in a manhole or the cable is twisted due to the removal of the splice closure, the shrinkage pipe is twisted along with the cable, but water cannot penetrate into the joint of the shrinkage pipe and the cable and the joint of the shrinkage pipe and the hollow pipe column.

Example 2

Fig. 4 is a schematic view of a telecommunication cable closure with a waterproof device of an elastic rubber shrink tube according to embodiment 2 of the present invention. In fig. 4, a telecommunications cable closure 60 (hereinafter referred to as a closure) is comprised of at least a cable access end 61, a cover 62 (partial), hollow columns 63, 64, 65, a flexible rubber shrink tube 70, a heat shrink tube 73, and a heat shrink tube pinch clamp 74. The connection box 60 can be used for connecting three different types of cables, such as straight connection, branched connection and intermediate lead-in branched connection. According to fig. 2(a), (B) and the description of the prior art of the present invention, the main cables 68, 69 are passed through the hollow pipe column 64 sleeved with the heat shrinkable tube 73, the heat shrinkable tube is clamped by the branch clamp 74 in the gap between the main cables 68, 69, and the heat shrinkable tube 73 and the branch clamp 74 are then fire-baked to complete the waterproof treatment between the main cables 68, 69 and the hollow pipe column 64. As for the waterproof treatment of the cable 66 entering and exiting the hollow pipe column 63, as described in embodiment 1, the first opening 701 of the elastic rubber shrink tube 70 (hereinafter referred to as shrink tube) is sleeved into the hollow pipe column 63, and then the cable 66 sequentially passes through the second opening 702 of the shrink tube 70 and the hollow pipe column 63 to enter the interior of the splice closure 60. Then, the first end 711 of the plastic strip 57 extending out of the second opening 702 is removed, and the hollow aperture expanded by the plastic strip 57 is immediately contracted to return to a smaller aperture close to the aperture before being expanded. After plastic strip 57 is continuously withdrawn until second end 712 of plastic strip 57 is disengaged from shrink tube 70, shrink tube 70 tightly encloses hollow tubular post 63 and a portion of cable 66, completing the waterproofing process of closure 60. The waterproofing is also achieved as shown in figure 4 by the shrink tube 58. after the plastic strip (not shown) is removed, the shrink tube 58 tightly encloses the hollow tubing string 65 and a portion of the cable 67.

Therefore, in embodiment 2 of the present invention, a user only needs to fire the first cable inlet/outlet when introducing the main cable, and then fire the heat shrinkable tube to complete the waterproof treatment, and then subsequently introduce other branch cables, and then perform the waterproof treatment with the elastic rubber shrinkable tube, because it is not necessary (or not necessary) to fire, the problem of water leakage of the junction box caused by the adjacent heat shrinkable tubes that are heated again to soften and release when the heat shrinkable tubes of other cable inlets/outlets are fired after the heat shrinkable tube for waterproofing of the first cable inlet/outlet is baked in the prior art is never generated.

Example 3

The waterproof treatment of embodiments 1 and 2 of the present invention can effectively prevent the junction box from water leakage, and the user can further fix the cable led into the junction box outside the junction box by the cable fixing device, so that the waterproof property of the junction box is enhanced when the junction box is moved or the cable is twisted or bent, and the joint of the cable and the shrinkage pipe is prevented from loosening.

Fig. 5 is a schematic view of a cable fixing device of a telecommunication cable closure according to embodiment 3 of the present invention. In fig. 5, a telecommunication cable closure 80 (referred to as a closure) is composed of at least a cable access end face 81, a cover 82 (partial) and hollow columns 83, 84, 85, elastic rubber shrink tubes 90, 91 and a cable fixing device. As described in embodiments 1 and 2, the hollow column 85 into which the main cables 88 and 89 enter is covered with the heat shrinkable tube 92, and the waterproofing between the main cables 88 and 89 and the hollow column 85 is completed; the hollow columns 83, 84 into which the branch cables 86, 87 enter are covered with elastic rubber shrink tubes 90, 91, and the waterproof treatment between the branch cables 86, 87 and the hollow columns 83, 84 is completed.

As shown in fig. 5, trunk cables 88, 89 may be further secured with cable securing means. Cable fixing means external to closure 80 for fixing the branch cables and/or trunk cables, the cable fixing means comprising: a first fixing portion 98 fixed to the closure 80 by a screw 99 passing through a screw hole (not shown) of the first fixing portion 98 and screwed into a screw hole (not shown) of the cable entry/exit end face 81; and a second fixing portion 100 connected to the first fixing portion 98, the second fixing portion 100 fixing the main cables 88, 89 introduced into the closure 80 with a caulking ring 101 and waterproofed with a heat shrinkable tube 92. In addition, the tightening ring 101 may be replaced with a tightening clamp or a tightening band. The cable fixing device further includes a supporting portion 97 connecting the first fixing portion 98 and the second fixing portion 100. The cable fixing device can also be applied to the branch cable which is covered by the shrinkage tube.

As shown in fig. 5, the branch cable 86 may further include a cable fixing device, which includes: the first fixing portion 93A and the clip 95 are assembled by a screw 96 (and another screw, not shown in fig. 5) to fix the first fixing portion outside the waterproof region of the hollow column-shrinkable tube; the second fixing portion 93B fixes the cable 86 introduced into the closure 80 by tightening the screw of the clamp 94. By connecting the second fixing portion 93B to the first fixing portion 93A, the cable 86 covered by the shrinkable tube 90 is fixed to the closure 80, and the waterproof effect of the shrinkable tube 90 is further enhanced.

The cable fixing device further includes a supporting portion 93 for connecting the first fixing portion 93A and the second fixing portion 93B, the second fixing portion 93B may be integrally formed on the supporting portion 93, and the first fixing portion 93A may be integrally formed on the supporting portion 93; alternatively, the first fixing portion 93A, the second fixing portion 93B, and the supporting portion 93 are integrally molded. In addition, the supporting portion 93 may be connected to the first fixing portion 93A, and the supporting portion 93 is fixed to the closure 80. Similarly, the cable 86, which enters the hollow tubing string 83 and is wrapped with the shrink tubing 90, may be secured in the same manner.

With the above descriptions of embodiments 1, 2 and 3, the present invention can effectively improve the disadvantages of the prior art that when a heat shrinkable tube for waterproofing a cable inlet/outlet is baked, and then the heat shrinkable tubes for other cable inlets/outlets are baked with fire, the heat shrinkable tubes adjacent to the baked heat shrinkable tubes are heated again to soften and loosen, which causes water leakage of the closure, and the cable is twisted and stressed to loosen and leak the waterproof structure of the closure when the closure is moved. The invention has the advantages of simple and safe construction, no need of using tools or fire sources, wide application range of cable outer diameter and the like, and can greatly reduce the investment cost of an operator.

The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.

Claims (18)

1. A communication cable closure with elastomeric shrink tube waterproofing, comprising:

a protective cover;

a cable entry and exit end face;

a hollow pipe column formed on the inlet and outlet end surfaces of the cable;

an elastic rubber shrink tube; and

the auxiliary mounting medium is arranged on the inner wall of the elastic rubber shrinkage pipe, and is removed after the cable is arranged inside the communication cable splicing box in a penetrating way, so that the elastic rubber shrinkage pipe can tightly coat the hollow pipe column and the cable exposed out of the hollow pipe column.

2. The cable closure of claim 1, further comprising a hollow tubular column at the cable entry and exit end of the cable closure for at least two cables passing through the hollow tubular column to enter and exit the cable closure, wherein the at least two cables about to pass through the hollow tubular column are prepared to be heat-shrinkable tubing coated on the outside of the hollow tubular column and a portion of the two cables not passing through the hollow tubular column form a waterproof structure.

3. The cable closure of claim 1, further comprising at least one cable securing device external to the cable closure, the cable securing device comprising:

the first fixing part is fixed on the cable junction box; and

the second fixing portion is connected to the first fixing portion, and the second fixing portion fixes the cable to be introduced into the cable closure to be waterproofed with one of the heat shrinkable tube and the elastic rubber shrinkable tube.

4. The cable fixing device according to claim 3, wherein the first fixing portion is embedded in a cable entry and exit end surface of the cable closure.

5. The cable fixing device of claim 3, wherein the first fixing portion is integrally formed on the cable entry and exit end face of the cable closure.

6. The cable fixing device of claim 3, wherein the first fixing portion is fixed to the cable entry/exit end of the cable closure by a fastening means selected from the group consisting of a screw, a snap, a tightening clamp, a tightening ring, and a tightening band.

7. The cable fixing device of claim 3, wherein the second fixing portion is fixed to the cable by a fastening clamp, a fastening ring, or a fastening band.

8. The cable fixing device of claim 3, further comprising a support portion for connecting the first fixing portion and the second fixing portion.

9. The cable fixing device of claim 8, wherein the second fixing portion is integrally formed with the support portion.

10. The cable fixing device according to claim 8, wherein the second fixing portion is mechanically coupled to the supporting portion.

11. The cable fixing device of claim 8, wherein the first fixing portion is integrally formed with the support portion.

12. The cable fixing device of claim 8, wherein the first fixing portion is mechanically coupled to the supporting portion.

13. The cable fixing device of claim 8, wherein the supporting portion is fixedly connected to the first fixing portion, and the supporting portion is fixed to the cable closure.

14. The cable fixing device of claim 8, wherein the support portion is made of a material selected from the group consisting of metal, plastic, and combinations thereof.

15. A telecommunications cable closure having a resilient rubber shrink tube waterproof means, the cable closure comprising: a protective cover; the cable access end face is provided with at least one hollow pipe column for accessing the cable splicing box through at least one cable of the hollow pipe column; and at least one elastic rubber shrinkage tube, wherein the elastic rubber shrinkage tube is a hollow synthetic rubber tube with rich elasticity and ductility, a flexible hard plastic strip is pre-arranged in a hollow hole of the rubber tube and is coiled on the inner wall of the rubber tube in a hollow thread tubular form to enlarge the hollow aperture of the rubber tube, the enlarged hollow aperture of the elastic rubber shrinkage tube is larger than the outer diameters of the hollow tubular column of the inlet and outlet end surfaces of the cable and the cable about to pass through the hollow tubular column, after the plastic strip arranged in the rubber tube is removed, the enlarged hollow aperture of the rubber tube by the plastic strip is elastically shrunk and restored to be close to the smaller aperture before the enlargement by the plastic strip, and the smaller aperture is smaller than the outer diameters of the hollow tubular column of the inlet and outlet end surfaces of the cable and the cable about to pass through the hollow tubular column, wherein the at least one cable about to pass through the at least one hollow tubular column is prepared to be tightly packed and bound on the hollow tubular column by the elastic rubber shrinkage tube The exterior and a part of the cable which does not penetrate into the hollow pipe column form a waterproof structure.

16. The cable closure of claim 15, further comprising a hollow tubular column at the cable access end of the cable closure for at least two cables passing through the hollow tubular column to enter and exit the cable closure, wherein the at least two cables about to pass through the hollow tubular column are prepared to be heat-shrinkable tubing around the exterior of the hollow tubular column and a portion of the two cables not passing through the hollow tubular column form a waterproof structure.

17. The cable closure of claim 15, further comprising at least one cable securing device external to the cable closure, the cable securing device comprising:

the first fixing part is fixed on the cable junction box; and

the second fixing portion is connected to the first fixing portion, and the second fixing portion fixes the cable to be introduced into the cable closure to be waterproofed with one of the heat shrinkable tube and the elastic rubber shrinkable tube.

18. An elastic rubber contraction tube for preventing water from entering and exiting a cable of a communication cable connection box, which comprises a protective cover and a cable inlet and outlet end face, wherein the cable inlet and outlet end face is provided with at least one hollow tubular column for at least one cable to enter and exit the cable connection box through the at least one hollow tubular column, the elastic rubber contraction tube comprises a hollow synthetic rubber tube with abundant elasticity and extensibility, a flexible hard plastic strip is pre-arranged in a hollow hole of the rubber tube and is coiled on the inner wall of the rubber tube in a hollow thread tubular form to enlarge the hollow aperture of the rubber tube, the enlarged hollow aperture of the elastic rubber contraction tube is larger than the outer diameters of the hollow tubular column of the cable inlet and outlet end face and the cable which is about to pass through the hollow tubular column, and after the plastic strip arranged in the rubber tube is removed, the enlarged hollow aperture of the rubber tube which is enlarged by the plastic strip is elastically contracted to be close to the smaller aperture which is enlarged by the plastic strip, and the smaller aperture is smaller than the outer diameters of the hollow pipe column of the inlet and outlet end surfaces of the cable and the cable to penetrate through the hollow pipe column, wherein the at least one cable to penetrate through the at least one hollow pipe column is prepared to be tightly wrapped outside the hollow pipe column by the elastic rubber shrinkage pipe, and a part of the cable which does not penetrate through the hollow pipe column forms a waterproof structure.