An expansion device for the middle joint of a cable accessory

Abstract

The present invention discloses an expansion device for the middle joint of a 110KV cable accessory. Fixing plates, guide heads, sleeves and clamps are respectively provided at both ends of the middle joint body; the guide head is of a cylindrical structure, the sleeve is sleeved outside the guide head, and one end of the frustum-shaped structures of part of the sleeve and the guide head is inserted into the middle joint body. Two annular ridges are provided on the outer wall of the sleeve, and the two annular ridges form an annular groove; two clamping plates are clamped in the annular groove, and two or more first through holes are provided on each of the two clamps. A T-shaped connecting rod passes through the first through holes at both ends of the middle joint body to connect the two clamps. The T-shaped connecting rod includes a cross bar and a vertical bar. The cross bar is stuck at the first through hole at one end of the middle joint body, and several second through holes are provided at the end of the vertical bar far from the cross bar. An insertion rod is inserted into one of the second through holes. The expansion method of the present invention is gentle and not likely to damage the middle joint.

Description

Technical Field

[0001] The present invention relates to the field of electric power, and particularly to an expansion device for the middle joint of 110KV cable accessories. Background Art

[0002] 110KV cable accessories have the characteristics of small volume, convenient operation, and few product specifications. Before installation and use, 110KV cable accessories are in a high-tension state, and being in this high-tension state for a long time is likely to cause problems such as permanent deformation or elastic relaxation of the cable accessories. Therefore, for 110KV cable accessories with relatively high requirements of 110kV and above, the on-site expansion method is selected, while for cable accessories of 35kV and below with relatively low requirements, the expansion is generally completed before leaving the factory.

[0003] Currently, the direct push method is mainly used for the installation of the middle joint body of high-voltage grade cables: after treating the cable insulation surface, the middle joint body is sleeved onto the long end of the cable through a pulling tool, pulled to a suitable position, the conductor is connected and the shielding cover is installed, and finally the cable middle joint body is pulled to the final position to complete the installation of the middle joint body.

[0004] The key to this installation method is the auxiliary tooling. Because the middle joint of high-voltage grade cables is installed with interference fit, the middle joint body is large and heavy, and it is difficult for the existing pulling tools to pull the body to the marked position; in addition, the inside of the body is extremely easy to be worn and scratched during the pulling process, which is likely to cause potential accident hazards. Summary of the Invention

[0005] The purpose of the present invention is to provide an expansion device for the middle joint of 110KV cable accessories.

[0006] To achieve the above-mentioned invention object, the technical solution of the present invention is: a 110KV cable accessory intermediate joint expansion device, with fixing plates, guide heads, sleeves and clamps respectively arranged at both ends of the intermediate joint main body; the guide head is a cylindrical structure, with a convex block at one end and a frustum-shaped structure at the other end. The maximum diameter of the guide head is larger than the inner diameter of the intermediate joint main body, and the minimum diameter is smaller than the inner diameter of the intermediate joint main body; a groove for inserting the convex block is arranged on one side of the fixing plate; the sleeve is sleeved outside the guide head, and the diameter of the sleeve is slightly larger than that of the guide head. There is a spacing between the end of the frustum-shaped structure of the sleeve and the frustum-shaped structure of the guide head. Part of the sleeve and one end of the frustum-shaped structure of the guide head are inserted into the intermediate joint main body. Two annular convex strips are arranged on the outer wall of the sleeve located outside the intermediate joint main body, and the two annular convex strips form an annular groove; the clamp includes two clamping plates, with semi-circular notches arranged on the clamping plates. The two clamping plates are connected to form a circular hole adapted to the outer diameter of the sleeve. The two clamping plates are clamped in the annular groove. Two or more first through holes are arranged on both clamps, and the first through holes are arranged at equal intervals along the circular hole. A T-shaped connecting rod passes through the first through holes at both ends of the intermediate joint main body to connect the two clamps. The T-shaped connecting rod includes a cross bar and a vertical bar. The cross bar is stuck at the first through hole at one end of the intermediate joint main body, and a plurality of second through holes are arranged at the end of the vertical bar far from the cross bar. An insertion rod is inserted into one of the second through holes to clamp the sleeves at both ends of the intermediate joint main body.

[0007] Further, a third through hole is arranged at the groove of the fixing plate, and a threaded hole corresponding to the third through hole is arranged on the guide head. The fixing plate and the guide head are connected by screws. The fixing plate and the guide head can be movably fixed when needed.

[0008] Further, the sleeve is composed of two semi-circular tubes. It is convenient to operate and is easier to be sleeved on the outer wall of the guide head.

[0009] Further, the two clamping plates of the clamp are connected by screws and nuts.

[0010] Further, the second through holes are arranged at equal intervals along the length direction of the vertical bar. The position where the insertion rod is inserted into the second through hole can be adjusted according to the length of the intermediate joint main body.

[0011] Further, there are two first through holes.

[0012] The beneficial effects of the present invention are:

[0013] 1. The expansion method of the present invention is gentle, not easy to damage the intermediate joint, and the construction quality is good; there is no need to use large-scale mechanical equipment. The device used has a small volume, a simple structure, is easy to disassemble and assemble, and is convenient to carry and transport; the installation and use method is simple, and the installation efficiency is high.

[0014] 2. In the present invention, the fixing plate and the guiding head are provided as a split structure, and the guiding head can be replaced according to the different diameters of the intermediate joint body without the need for overall replacement. The fixture is clamped in the annular groove and can rotate within the annular groove, making the installation more flexible and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural view of the present invention;

[0016] Figure 2 is a schematic structural view of the fixture. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0018] Embodiment 1: A 110KV cable accessory intermediate joint expansion device, where fixing plates 2, guiding heads 3, sleeves 4, and fixtures 5 are respectively provided at both ends of the intermediate joint body 1; the guiding head 3 is a cylindrical structure, with a convex block 3.1 at one end and a frustum-shaped structure at the other end. The maximum diameter of the guiding head 3 is greater than the inner diameter of the intermediate joint body 1, and the minimum diameter is less than the inner diameter of the intermediate joint body 1; a groove 2.1 for inserting the convex block 3.1 is provided on one side of the fixing plate 2; a third through hole 2.2 is provided at the groove 2.1 of the fixing plate 2, and a threaded hole 3.2 corresponding to the third through hole 2.2 is provided on the guiding head 3. The fixing plate 2 and the guiding head 3 are connected by screws. The sleeve 4 is sleeved outside the guiding head 3, and the diameter of the sleeve 4 is slightly larger than that of the guiding head 3. The sleeve 4 is composed of two semi-circular tubes. There is a gap between the end of the frustum-shaped structure of the sleeve 4 and the frustum-shaped structure of the guiding head 3. Part of the sleeve 4 and one end of the frustum-shaped structure of the guiding head 3 are inserted into the intermediate joint body 1. Two annular ridges 6 are provided on the outer wall of the sleeve 4 located outside the intermediate joint body 1, and the two annular ridges 6 form an annular groove 7; the fixture 5 includes two clamping plates 5.1, and the two clamping plates 5.1 of the fixture 5 are connected by screws and nuts. A semi-circular notch 5.2 is provided on the clamping plate 5.1, and the two clamping plates 5.1 are connected to form a circular hole 5.3 adapted to the outer diameter of the sleeve 4. The two clamping plates 5.1 are clamped in the annular groove 7. Two or more first through holes 8 are provided on both fixtures 5. Preferably, there are two first through holes 8, and the first through holes 8 are arranged at equal intervals along the circular hole 5.3. A T-shaped connecting rod 9 passes through the first through holes 8 at both ends of the intermediate joint body 1 to connect the two fixtures 5. The T-shaped connecting rod 9 includes a cross bar 9.1 and a vertical bar 9.2. The cross bar 9.1 is stuck in the first through hole 8 at one end of the intermediate joint body 1. A plurality of second through holes 11 are provided at the end of the vertical bar 9.2 away from the cross bar 9.1, and the second through holes 11 are arranged at equal intervals along the length direction of the vertical bar 9.2. An insertion rod 10 is inserted into one of the second through holes 11 to clamp the sleeves 4 at both ends of the intermediate joint body 1.

[0019] During operation: First, fix the fixing plate 2 and the guiding head 3. Use the fixture 5 to form a sleeve 4 from the semi-circular pipe and put it outside the guiding head 3. Insert the two guiding heads 3 into both ends of the intermediate joint body 1. The sleeve 4 is inserted into both ends of the intermediate joint body 1 together with the guiding head 3. Insert the two T-shaped connecting rods 9 into the first through holes 8 of the fixtures at both ends respectively, and insert the inserting rod into the second through hole 11 to complete the expansion under the action of the guiding head of the intermediate joint body 1. After the expansion is completed, remove the fixing plates 2 and the guiding heads 3 at both ends, put the intermediate joint body 1 on the long end of the cable, pull it to the appropriate position, and finally remove the sleeve 4. The fixing plate 2 and the guiding head 3 are set as a split structure, and the guiding head 3 can be replaced according to different diameters of the intermediate joint body 1 without the need for overall replacement. The fixture 5 is clamped in the annular groove 7 and can rotate in the annular groove 7, making the installation more flexible and convenient.

[0020] The described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

Claims

1. An expansion device for the middle joint of 110KV cable accessories, characterized in that, Both ends of the intermediate joint body are respectively provided with a fixing plate, a guiding head, a sleeve and a clamp; the guiding head is a cylindrical structure, one end of the guiding head is provided with a convex block, the other end is a frustum-shaped structure, the maximum diameter of the guiding head is greater than the inner diameter of the intermediate joint body, and the minimum diameter is less than the inner diameter of the intermediate joint body; one side of the fixing plate is provided with a groove for inserting the convex block; the sleeve is sleeved outside the guiding head, the diameter of the sleeve is slightly larger than that of the guiding head, there is a spacing between the end of the frustum-shaped structure of the sleeve and the frustum-shaped structure of the guiding head, and part of the sleeve and one end of the frustum-shaped structure of the guiding head are inserted into the intermediate joint body. Two annular convex strips are provided on the outer wall of the sleeve located outside the intermediate joint body, and the two annular convex strips form an annular groove; the clamp includes two clamping plates, the clamping plates are provided with semi-circular notches, the two clamping plates are connected to form a circular hole adapted to the outer diameter of the sleeve, the two clamping plates are clamped in the annular groove, and more than two first through holes are provided on both clamps, and the first through holes are arranged at equal intervals along the circular hole. A T-shaped connecting rod passes through the first through holes at both ends of the intermediate joint body to connect the two clamps. The T-shaped connecting rod includes a cross bar and a vertical bar. The cross bar is stuck at the first through hole at one end of the intermediate joint body, and a number of second through holes are provided at the end of the vertical bar far from the cross bar. An insertion rod is inserted into one of the second through holes to clamp the sleeves at both ends of the intermediate joint body.

2. The 110 KV cable accessory intermediate joint expansion device according to claim 1, characterized in that, A third through hole is provided at the groove of the fixing plate, a threaded hole corresponding to the third through hole is provided on the guiding head, and the fixing plate and the guiding head are connected by screws.

3. The 110 KV cable accessory intermediate joint expansion device according to claim 1, characterized in that, The sleeve is composed of two semi-cylindrical pipes.

4. The 110 KV cable accessory intermediate joint expansion device according to claim 1, characterized in that, The two clamping plates of the clamp are connected by screws and nuts.

5. The 110 KV cable accessory intermediate joint expansion device according to claim 1, characterized in that, The second through holes are arranged at equal intervals along the length direction of the vertical bar.

6. The 110 KV cable accessory intermediate joint expansion device according to claim 1, characterized in that, There are two first through holes.

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