Cable accessory mounting device and diameter expanding method

Abstract

The invention relates to the field of cable accessories, in particular to a cable accessory installation device and a diameter expanding method.The cable accessory installation device comprises an inflation device, a sleeve with one closed end is connected to the inflation device, a diameter expanding arm is arranged on the sleeve, a diameter expanding strip is arranged in the diameter expanding arm in a sliding fit mode, and the diameter expanding strip is connected with the inflation device. According to the invention, the expanding arm and the expanding pipe are arranged, and high-pressure gas is used for pushing the expanding pipe to extend outwards, so that the cable accessory expands without friction, when the cable accessory is sleeved on the cable, friction-free sleeving can be realized, the cable and the cable accessory are not damaged, the installation quality of the accessory is improved, and the fault rate of a cable system is reduced.

Description

Technical Field

[0001] The invention relates to the field of cable accessories, and in particular to a cable accessory installation device and a diameter expansion method. Background Art

[0002] Cold shrink cable accessories are small in size and easy to operate. Before installation, if the cable accessories are in a high tension state for a long time, it is easy to cause permanent deformation or elastic relaxation of the cable accessories. Therefore, for 110kV and above voltage level cold shrink cable accessories with relatively high performance requirements, on-site expansion is usually adopted. Most of the existing cable accessory expansion devices will rub the inner wall of the cable accessories during expansion and sleeve connection, which may damage the cable accessories.

[0003] Therefore, those skilled in the art are committed to developing a frictionless cable accessory installation device and a diameter expansion method. Summary of the invention

[0004] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a frictionless cable accessory installation device and a diameter expansion method.

[0005] To achieve the above-mentioned purpose, the present invention provides a cable accessory installation device, including an inflation device, to which a sleeve with a closed end is connected, an expansion arm is provided on the sleeve, an expansion strip is slidably fitted inside the expansion arm, and an expansion tube is sleeved outside the sleeve.

[0006] Preferably, the expansion arm is in communication with the sleeve, a slider is slidably fitted in the expansion arm, and one end of the slider away from the sleeve is fixedly connected to the expansion bar.

[0007] Preferably, the expansion arms are arranged in 4 groups, and one group includes two symmetrically arranged expansion arms.

[0008] Preferably, a groove corresponding to the expansion arms is formed on the inner side of the expansion tube, and the expansion arm is located in the groove at one end away from the sleeve.

[0009] Preferably, the axis of the expansion arm is perpendicular to the axis of the casing.

[0010] Preferably, the expanded tube includes a first expanded plate and a second expanded plate, and the first expanded plate and the second expanded plate are detachably connected.

[0011] Preferably, the first diameter expansion plate and the second diameter expansion plate are respectively provided with a first bottom plate and a second bottom plate at one end close to the inflatable device.

[0012] Preferably, the first bottom plate is provided with a first support ear and a second support ear at both ends, and the second bottom plate is provided with a third support ear and a fourth support ear at both ends;

[0013] A first support rod is provided between the first support ear and the third support ear, and a second support rod is provided between the second support ear and the fourth support ear.

[0014] The present invention also provides a method for expanding the diameter of a cable accessory, which is implemented by using any of the cable accessory installation devices described above.

[0015] Preferably, the method comprises the following steps:

[0016] S1. Clean the expansion tube and apply a layer of silicone grease on its outer surface;

[0017] S2. Connect the expansion arm to the expansion tube, then place the entire casing into the cable accessories and connect the inflation device;

[0018] S3, filling the casing with compressed gas through the inflation device;

[0019] S4. After the cable accessory expansion reaches the expected effect, the first expansion plate and the second expansion plate are supported, and then the casing is taken out;

[0020] S5. Put the cable accessories with expansion tubes on the outside of the cables to be connected, remove the expansion tubes, and wait for the cable accessories to shrink naturally.

[0021] The beneficial effects of the present invention are as follows: the present invention provides an expansion arm and an expansion tube, and uses high-pressure gas to push the expansion tube to extend outward, thereby allowing the cable accessories to expand without friction, and also to achieve frictionless socketing when socketed onto the cable, without damaging the cable and the cable accessories, thereby improving the installation quality of the accessories and reducing the failure rate of the cable system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an assembly schematic diagram of a specific implementation mode of the present invention.

[0023] Figure 2 yes Figure 1 Enlarged structural diagram of point A in the middle

[0024] Figure 3 It is a side view of a sleeve in a specific embodiment of the present invention.

[0025] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure of AA.

[0026] Figure 5 It is a schematic structural diagram of the second expanded tube in a specific implementation manner of the present invention.

[0027] Figure 6 It is a schematic diagram of the assembly of the first diameter expansion plate and the second diameter expansion plate in a specific embodiment of the present invention.

[0028] 1. Inflatable device; 2. Sleeve; 3. Expansion arm; 4. Expansion strip; 5. Expansion tube; 51. First expansion plate; 52. Second expansion plate; 6. Slider; 7. Groove; 81. First base plate; 81a. First ear; 81b. Second ear; 82. Second base plate; 82a. Third ear; 82b. Fourth ear; 91. First support rod; 92. Second support rod; 10. Cable accessories. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific manner, and therefore cannot be understood as limiting the present invention. The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] like Figure 1-6 As shown, a cable accessory installation device includes an inflation device 1. The inflation device 1 can use a common inflation pump on the market. A threaded connection is used between the inflation device 1 and the sleeve 2 to ensure the connection strength and air tightness. An expansion arm 3 is provided on the sleeve 2. The expansion arm 3 is connected to the sleeve 2. A slider 6 is slidably fitted in the expansion arm 3. In this embodiment, the sliding fit is a clearance fit. The slider 6 is made of a low-friction material. The slider 6 is fixedly connected to the expansion strip 4 at one end away from the sleeve 2. The expansion strip 4 extends axially along the expansion arm 3. The expansion strip 4 has a smooth appearance and an outer diameter smaller than the inner diameter of the expansion arm 3, so that it is easy to expand. An expansion tube 5 is provided on the outer sleeve 2. The expansion tube 5 is a hollow cylindrical shape and includes a first expansion plate 51 and a second expansion plate 52. The first expansion plate 51 and the second expansion plate 52 are detachably connected.

[0031] In the present embodiment: the expansion arms 3 are arranged in 4 groups, one group includes two symmetrically arranged expansion arms 3, the number of the expansion arms 3 is determined according to the actual situation, and in other embodiments, other numbers of expansion arms 3 may be adopted, the inner side of the expansion tube 5 is provided with grooves 7 corresponding to the expansion arms 3 one by one, the end of the expansion arm 3 away from the sleeve 2 is located in the groove 7, the end of the expansion arm 3 away from the sleeve 2 may be made of magnetic material so that it can adsorb the expansion tube 5, which is convenient for operation during the early installation process.

[0032] In this embodiment: the outer diameter of the expansion tube 5 is slightly smaller than the inner diameter of the cable accessory 10, and the outer wall of the expansion tube 5 is smooth to avoid damage to the inner wall of the cable accessory 10. The axis of the expansion arm 3 is perpendicular to the axis of the sleeve 2, so that the inner wall of the cable accessory 10 is evenly stressed.

[0033] In this embodiment: the expansion tube 5 includes a first expansion plate 51 and a second expansion plate 52. The first expansion plate 51 and the second expansion plate 52 are respectively provided with a radially extending first bottom plate 81 and a second bottom plate 82 near one end of the inflatable device 1. The first bottom plate 81 is respectively provided with a first support ear 81a and a second support ear 81b at both ends, and the second bottom plate 82 is respectively provided with a third support ear 82a and a fourth support ear 82b at both ends. The first support ear 81a and the third support ear 82a are supported by a first support rod 91, and the second support ear 81b and the fourth support ear 82b are supported by a second support rod 92. After the support is completed, the sleeve 2 is taken out, and the cable accessory 10 is sleeved onto the outside of another section of the cable. The first expansion plate 51 and the second expansion plate 52 are taken out through the first bottom plate 81 and the second bottom plate 82. The cable accessory 10 shrinks naturally without external force and is sleeved onto the cable.

[0034] When in use, the sleeve 2 is connected to the inflation device 1, and then the sleeve 2 is inserted into the cable accessory 10. Then, under the push of high-pressure gas, the slider 6 slides outward along the inner wall of the expansion arm 3, and the expansion bar 4 fixedly connected to the slider 6 pushes the first expansion tube 51 and the second expansion tube 52 to move outward synchronously relative to each other, so as to achieve the purpose of expanding the cable accessory 10. After the expansion is completed, the first bottom plate 81 and the second bottom plate 82 are supported to remove the sleeve 2. After removing the sleeve 2, the cable accessory 10 with the expansion tube 5 is sleeved onto another section of cable. The expansion tube 5 is taken out, and the cable accessory 10 naturally contracts without external force, completing the entire expansion and sleeve process. Through this series of operations, the frictionless expansion and frictionless sleeve of the cable accessory 10 can be effectively realized, the installation quality of the cable accessory 10 can be improved, and the failure rate of the cable system can be reduced.

[0035] The present invention also provides a method for expanding the diameter of a cable accessory, comprising any of the above-described cable accessory installation devices, and the specific steps are as follows:

[0036] S1. Clean the expansion tube 5. Wipe the outer surface of the expansion tube 5 with a non-woven cloth and apply a layer of silicone grease on the outer surface to reduce friction and protect the inner wall of the cable accessory 10.

[0037] S2. Connect the expansion arm 3 to the expansion tube 5 so that the end of the expansion arm 3 is located in the groove 7 on the expansion tube 5, then put the sleeve 2 as a whole into the cable accessory 10 and connect the inflation device 1.

[0038] S3. Compressed gas is slowly filled into the sleeve 2 through the inflation device 1. The gas pressure acts on the slider 6 to push the expansion strip 4, so that the first expansion plate 51 and the second expansion plate 52 are displaced and expanded toward each other. This process needs to be properly controlled to ensure that the cable accessory 10 is expanded evenly and in place.

[0039] S4. After the cable accessory 10 is expanded to its proper position, the first diameter expansion plate 51 and the second diameter expansion plate 52 are supported, and then the sleeve 2 is taken out.

[0040] S5. Sleeve the cable accessory 10 with the expansion tube 5 on the outside of the cable, take out the expansion tube 5, let the cable accessory 10 shrink naturally without external force, and sleeve it on the cable, completing the entire expansion and sleeve process.

[0041] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A cable accessory installation device, comprising an inflatable device (1), characterized in that: The inflation device (1) is connected to a sleeve (2) with a closed end, the sleeve (2) is provided with a diameter expansion arm (3), a diameter expansion strip (4) is slidably fitted inside the diameter expansion arm (3), and the sleeve (2) is provided with a diameter expansion tube (5) outside.

2. The cable accessory installation device according to claim 1, characterized in that: The expansion arm (3) is in communication with the sleeve (2), a slider (6) is slidably fitted inside the expansion arm (3), and the end of the slider (6) away from the sleeve (2) is fixedly connected to the expansion strip (4).

3. The cable accessory installation device according to claim 1, characterized in that: The diameter-expanding arms (3) are arranged in four groups, with one group comprising two symmetrically arranged diameter-expanding arms (3).

4. The cable accessory installation device according to claim 1, characterized in that: The inner side of the expansion tube (5) is provided with a groove (7) corresponding to the expansion arm (3) one by one, and the end of the expansion arm (3) away from the sleeve (2) is located in the groove (7).

5. The cable accessory installation device according to claim 4, characterized in that: The axis of the expansion arm (3) is perpendicular to the axis of the sleeve (2).

6. The cable accessory installation device according to claim 1, characterized in that: The expanded diameter pipe (5) comprises a first expanded diameter plate (51) and a second expanded diameter plate (52), and the first expanded diameter plate (51) and the second expanded diameter plate (52) are detachably connected.

7. The cable accessory installation device according to claim 6, characterized in that: The first diameter expansion plate (51) and the second diameter expansion plate (52) are respectively provided with a first bottom plate (81) and a second bottom plate (82) at one end close to the inflatable device (1).

8. The cable accessory installation device according to claim 1, characterized in that: The first bottom plate (81) is provided with a first support ear (81a) and a second support ear (81b) at both ends, and the second bottom plate (82) is provided with a third support ear (82a) and a fourth support ear (82b) at both ends; A first support rod (91) is provided between the first support ear (81a) and the third support ear (82a), and a second support rod (92) is provided between the second support ear (81b) and the fourth support ear (82b).

9. A method for expanding the diameter of a cable accessory, characterized in that: This is achieved by using a cable accessory installation device as described in any one of claims 1-8.

10. The cable accessory diameter expansion method according to claim 9, characterized in that: The following steps are involved: S1, clean the expansion tube (5) and apply a layer of silicone grease on its outer surface; S2, connecting the expansion arm (3) to the expansion tube (5), then placing the sleeve (2) as a whole into the cable accessory (10), and connecting the inflation device (1); S3, filling the sleeve (2) with compressed gas through the inflation device (1); S4. After the cable accessory (10) has expanded to achieve the desired effect, the first diameter expansion plate (51) and the second diameter expansion plate (52) are supported, and then the sleeve (2) is removed; S5. Sleeve the cable accessory (10) with the expansion tube (5) onto the outside of the cable to be connected, remove the expansion tube (5), and wait for the cable accessory (10) to shrink naturally.

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