CN215934316U - Back-twist waterproof high-voltage cable traction head - Google Patents
Back-twist waterproof high-voltage cable traction head Download PDFInfo
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- CN215934316U CN215934316U CN202121601976.6U CN202121601976U CN215934316U CN 215934316 U CN215934316 U CN 215934316U CN 202121601976 U CN202121601976 U CN 202121601976U CN 215934316 U CN215934316 U CN 215934316U
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Abstract
The utility model relates to a back-twist waterproof high-voltage cable drawing head, which comprises: the high-voltage cable consists of a conductor, an insulating sleeve, a corrugated aluminum sheath and an outer sheath which are sequentially coated outside the conductor, and a traction head provided with a back-twist traction device; the front end of the high-voltage cable is provided with a stepped shaft-shaped exposed section consisting of a conductor section, an insulating sleeve section and a corrugated aluminum sheath section; the traction head includes: the rear end is provided with a compression joint hole which is sleeved outside the conductor section and a traction body which is compressed with the conductor section, a waterproof insulating adhesive tape inner layer which is coated outside the insulating sleeve, a ring groove which is arranged at the outer side wall of the rear end of the traction body, connecting pipes of which the two ends are connected with the ring groove side wall and the outer side wall of the corrugated aluminum sheath section in a one-to-one correspondence manner, a waterproof insulating adhesive tape outer layer which is coated outside the connecting pipe and the joint of the corrugated aluminum sheath, and a semi-conductive buffering water-blocking tape layer which is coated outside the corrugated aluminum sheath section, the waterproof insulating adhesive tape outer layer and the connecting pipe.
Description
Technical Field
The utility model relates to the technical field of cable laying, in particular to a back-twist waterproof high-voltage cable drawing head.
Background
In the process of laying a high-voltage cable, a traction head arranged at the head of the cable is usually pulled by a traction rope for laying; the construction of the pulling head is known from the utility model of the chinese patent application No. 201320033453.5. In the cable laying process of the traditional cable traction head, torsion generated by rotation of a traction rope acts on the traction head and a cable, so that a connecting pipe of the traction head is easy to distort and damage, the cable is easy to distort and deform, and the cable laying quality is influenced; therefore, design one kind at the cable laying in-process, can not cause the connecting pipe distortion damage, the cable can not distortion laying quality better, inside water can not get into the cable from the cable head of being connected with the traction head, the waterproof high tension cable traction head of back torsion that improves high voltage electric network operation security becomes the problem that awaits a urgent need to solve.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects that a connecting pipe of a pulling head is easy to distort and damage, the cable distorts and deforms to influence the cable laying quality, water easily enters the cable from the head of the cable connected with the pulling head, and serious hidden danger is caused to the safe operation of a high-voltage power grid in the cable laying process of the conventional back-twist waterproof high-voltage cable pulling head.
The specific technical scheme of the utility model is as follows:
a untwisted waterproof high-voltage cable pulling head comprising: the high-voltage cable consists of a conductor, an insulating sleeve, a corrugated aluminum sheath and an outer sheath which are sequentially coated outside the conductor, and a traction head provided with a back-twist traction device; the front end of the high-voltage cable is provided with a stepped shaft-shaped exposed section consisting of a conductor section, an insulating sleeve section and a corrugated aluminum sheath section; the traction head includes: the rear end is provided with a crimping hole sleeved outside the conductor section and a traction body crimped with the conductor section, the length of the conductor section is equal to or less than that of the crimping hole, the rear end of the traction body is abutted against the front end of the insulating sleeve section, a waterproof insulating adhesive tape inner layer is positioned between the rear end of the traction body and the front end of the corrugated aluminum sheath section and is coated outside the insulating sleeve, a ring groove is arranged at the outer side wall of the rear end of the traction body, a connecting pipe is arranged at the outer side of the outer side wall of the rear end of the traction body, the outer diameter of the connecting pipe is less than that of the ring groove, two ends of the connecting pipe are in one-to-one correspondence with the ring groove side wall and the outer side wall of the corrugated aluminum sheath section, a waterproof insulating adhesive tape outer layer is coated outside the connecting part of the connecting pipe and the corrugated aluminum sheath section, and a semi-conductive buffer water blocking tape layer is positioned between the front end of the outer sheath and the ring groove and is coated outside the corrugated aluminum sheath section, the waterproof insulating adhesive tape outer layer and the connecting pipe; the outer diameter of the conductor section is matched with the diameter of the crimping hole; the connecting pipe is an aluminum connecting pipe.
Preferably, the back-twist traction device comprises: the traction device comprises a rear traction rod, a front traction rod, a traction groove and a traction pull column, wherein the rear traction rod consists of a rear section, a front section with the diameter smaller than that of the rear section, and a conical section with two ends respectively connected with the front end of the rear section and the rear end of the front section; the rear end of the traction body is provided with a stepped shaft-shaped connecting section which is positioned in the containing counter bore, and the small end of the stepped shaft-shaped connecting section is positioned on the front side; the big end of the stepped shaft-shaped connecting section is provided with an external thread screwed with the internal thread; a sealing ring is arranged between the rear end of the traction rod and the front end of the front section.
Preferably, the untwisting waterproof high-voltage cable pulling head further comprises: the heat-shrinkable sleeve is coated on the front part of the outer sheath, the semi-conductive buffering water-blocking tape layer, the traction head, the rear section and the conical section; the overlapping length of the thermoplastic sleeve and the cable outer sheath is 90mm to 110 mm.
Preferably, the inner layer of the waterproof insulating tape is formed by overlapping and winding two layers of waterproof insulating tapes, and the overlapping rate is 50-60%; the elongation of the waterproof insulating tape is 30% to 50%.
Preferably, the outer layer of the waterproof insulating tape is formed by overlapping and winding two layers of waterproof insulating tapes, and the overlapping rate is 50-60%; the elongation of the waterproof insulating tape is 30% to 50%.
Preferably, the semiconductive buffering water-blocking tape layer is formed by lapping and covering a semiconductive buffering water-blocking tape, and the lapping rate is 50-60%.
The preparation method of the untwisted waterproof high-voltage cable drawing head comprises the following steps of (1) stripping a stepped shaft-shaped exposed section which is arranged at the front end of a high-voltage cable and consists of a conductor section, an insulating sleeve section and a corrugated aluminum sheath section by using a wire stripping machine; (2) placing the conductor section in a crimping hole, and mechanically pressing the small end of the stepped shaft-shaped connecting section by using a crimping machine to crimp the conductor section with the traction body; (3) the conductor is a split conductor, and copper wires or copper bars must be filled in gaps of the conductor section during crimping; (4) the waterproof insulating tape is used for winding the inner layer of the waterproof insulating tape which is positioned between the rear end of the traction body and the front end of the corrugated aluminum sheath section and is coated outside the insulating sleeve; (5) welding two ends of the connecting pipe with ring groove side walls and outer side walls of the corrugated aluminum sheath section in a one-to-one correspondence manner by using an argon arc welding machine, cleaning and brushing the welding joint for multiple times in the circumferential direction by using a steel wire brush before welding, wherein the width of a welding seam between the inner side walls of the connecting pipe and the outer side walls of the corrugated aluminum sheath section is equal to or larger than the pitch of the corrugated aluminum sheath, and the thickness of the position with the minimum radial thickness of the welding seam is equal to or larger than 3 mm; (6) the outer layer of the waterproof insulating tape is wound and coated outside the joint of the connecting pipe and the corrugated aluminum sheath; (7) winding a semiconductive buffer water-blocking tape layer which is positioned between the front end of the outer sheath and the front end of the ring groove and is wrapped on the corrugated aluminum sheath section, the outer layer of the waterproof insulating tape and the outside of the connecting pipe by using the semiconductive buffer water-blocking tape; (8) screwing an internal thread arranged at the large end of the stepped shaft-shaped connecting section with an external thread arranged at the rear end of the accommodating counter bore, and installing a back-twist traction device; (9) and uniformly heating and plastically packaging the heat-shrinkable sleeve, and coating the heat-shrinkable sleeve outside the front part of the outer sheath, the semi-conductive buffering water-blocking tape layer, the traction head, the rear section and the conical section.
Compared with the prior art, the utility model has the beneficial effects that: in the untwisting waterproof high-voltage cable traction head, in the cable laying process, the traction rope connected with the traction pull column pulls the high-voltage cable to move forwards, when the traction rope rotates to generate torsion, the rear end of the front traction rod and the front end of the front section are pivoted and can be untwisted, and a plurality of waterproof and waterproof layers are formed by a waterproof insulating tape inner layer, a waterproof insulating tape outer layer, a semi-conductive buffer water-blocking tape layer and a heat-shrinkable sleeve which are arranged in an inner-outer staggered mode, for the occasions with worse construction conditions or the south China with higher underground water level, particularly when the cable is penetrated through a large-length top pipe, the traction head is not easy to be damaged by pulling to cause water inflow at the front end of the high-voltage cable, in the cable laying process, the connecting pipe cannot be distorted and damaged, the cable cannot be distorted and deformed, the laying quality is good, water cannot enter the cable from the cable head connected with the traction head, and the operation safety of a high-voltage power grid is improved. A sealing ring is arranged between the rear end of the traction rod and the front end of the front section, so that water resistance is facilitated. The heat-shrinkable sleeve is coated outside the front part of the outer sheath, the semi-conductive buffering water-blocking tape layer, the traction head, the rear section and the conical section, and the overlapping length of the heat-shrinkable sleeve and the cable outer sheath is 90mm to 110mm, so that the tensile strength and the shearing strength are favorably improved. The waterproof insulating tape inner layer is formed by overlapping and winding two layers of waterproof insulating tapes, the overlapping rate is 50% -60%, the waterproof insulating tape outer layer is formed by overlapping and winding two layers of waterproof insulating tapes, the overlapping rate is 50% -60%, the semi-conductive buffering water-blocking tape layer is formed by overlapping and covering the semi-conductive buffering water-blocking tape layer, the overlapping rate is 50% -60%, the waterproof water-blocking effect is better, the elongation rate of the waterproof insulating tapes is 30% -50%, and the waterproof insulating tape inner layer and the waterproof insulating tape outer layer are not prone to damage.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
In the figure: the outer sheath 1, the conductor section 2, the insulating sleeve section 3, the corrugated aluminum sheath section 4, the crimping hole 5, the traction body 6, the waterproof insulating tape inner layer 7, the ring groove 8, the connecting pipe 9, the waterproof insulating tape outer layer 10, the semi-conductive buffering water-blocking tape layer 11, the rear section 12, the front section 13, the tapered section 14, the tapered roller bearing 15, the front traction rod 16, the traction groove 17, the traction pull column 18, the stepped shaft-shaped connecting section 19, the accommodating counter bore 20, the heat-shrinkable sleeve 21 and the sealing ring 22.
Detailed Description
The utility model will be further described with reference to the drawings.
As shown in figure 1: a untwisted waterproof high-voltage cable pulling head comprising: the high-voltage cable consists of a conductor, an insulating sleeve, a corrugated aluminum sheath and an outer sheath 1 which are sequentially coated outside the conductor, and a traction head provided with a back-twist traction device; the front end of the high-voltage cable is provided with a stepped shaft-shaped exposed section consisting of a conductor section 2, an insulating sleeve section 3 and a corrugated aluminum sheath section 4; the traction head includes: the rear end is provided with a compression joint hole 5 which is sleeved outside the conductor section 2 and a traction body 6 which is compressed with the conductor section 2, the length of the conductor section 2 is less than the length of the compression joint hole 5 by 0.5mm, the rear end of the traction body 6 is pressed against the front end of the insulating sleeve section 3, a waterproof insulating adhesive tape inner layer 7 which is positioned between the rear end of the traction body 6 and the front end of the corrugated aluminum sheath section 4 and is coated outside the insulating sleeve, a ring groove 8 which is arranged on the outer side periphery of the rear end of the traction body 6, a connecting pipe 9 which is smaller than the outer diameter of the ring groove 8 and has two ends which are correspondingly welded with the side periphery of the ring groove 8 and the outer side periphery of the corrugated aluminum sheath section 4 one by one, a waterproof insulating adhesive tape outer layer 10 which is coated outside the welding part of the connecting pipe 9 and the corrugated aluminum sheath, and a semi-conductive buffer water-blocking tape layer 11 which is positioned between the front end of the outer sheath 1 and the front end of the ring groove 8 and is coated outside the corrugated aluminum sheath section 4, the waterproof insulating adhesive tape outer layer 10 and the connecting pipe 9; the outer diameter of the conductor section 2 is in clearance fit with the diameter of the crimping hole 5; the connection pipe 9 is an aluminum connection pipe.
The back-twist traction device comprises: the traction device comprises a rear traction rod, a front traction rod 16, a traction groove 17 and a traction pull column 18, wherein the rear traction rod is composed of a rear section 12, a front section 13 with the diameter smaller than that of the rear section 12, a conical section 14 with two ends respectively connected with the front end of the rear section 12 and the rear end of the front section 13, the rear end of the front traction rod is pivoted with the front end of the front section 13 through a tapered roller bearing 15, the traction groove 17 is arranged at the front end of the front traction rod 16, and the two ends of the traction pull column are respectively in threaded connection with the traction rod and penetrate through the traction groove 17; the rear end of the traction body 6 is provided with a stepped shaft-shaped connecting section 19 which is positioned in the containing counter bore and the small end of which is positioned at the front side, and the containing counter bore 20 which is positioned at the rear end of the rear traction rod and the rear end of which is provided with internal threads; the big end of the stepped shaft-shaped connecting section 19 is provided with an external thread screwed with the internal thread; a sealing ring 22 is arranged between the rear end of the traction rod and the front end of the front section. The seal ring 22 is an O-ring; the traction groove 17 is a U-shaped traction groove.
The waterproof high tension cable traction head of back-twist still include: the heat-shrinkable sleeve 21 is coated outside the front part of the outer sheath 1, the semi-conductive buffering water-blocking tape layer 11, the traction head, the rear section 12 and the conical section 14; the overlapping length of the thermoplastic sleeve and the cable outer sheath 1 is 100 mm.
The inner layer 7 of the waterproof insulating tape is formed by overlapping and winding two layers of waterproof insulating tapes, and the overlapping rate is 50%; the elongation of the waterproof insulating tape was 50%.
The outer layer 10 of the waterproof insulating tape is formed by overlapping and winding two layers of waterproof insulating tapes, and the overlapping rate is 50%; the elongation of the waterproof insulating tape was 50%.
The semiconductive buffering water-blocking tape layer 11 is formed by lapping and covering a semiconductive buffering water-blocking tape, and the lapping rate is 50%.
The preparation method of the untwisted waterproof high-voltage cable drawing head comprises the following steps of (1) stripping a stepped shaft-shaped exposed section which is arranged at the front end of a high-voltage cable and consists of a conductor section 2, an insulating sleeve section 3 and a corrugated aluminum sheath section 4 by using a wire stripping machine; (2) placing the conductor section 2 in the crimping hole 5, and mechanically pressing the small end of the stepped shaft-shaped connecting section 19 by using a crimping machine to crimp the conductor section 2 with the traction body 6; (3) the conductor is a split conductor, and copper wires or copper bars must be filled in gaps of the conductor section 2 during crimping; (4) a waterproof insulating tape is used for winding a waterproof insulating tape inner layer 7 which is positioned between the rear end of the traction body 6 and the front end of the corrugated aluminum sheath section 4 and is coated outside the insulating sleeve; (5) welding two ends of the connecting pipe 9 with the side walls of the ring groove 8 and the outer side wall of the corrugated aluminum sheath section 4 in a one-to-one correspondence manner by using an argon arc welding machine, cleaning and brushing the welding joint by using a steel wire brush for multiple times in the circumferential direction before welding, wherein the width of a welding seam between the inner side wall of the connecting pipe 9 and the outer side wall of the corrugated aluminum sheath section 4 is equal to the pitch of the corrugated aluminum sheath, and the thickness of the position with the minimum radial thickness of the welding seam is equal to 3 mm; (6) the waterproof insulating tape outer layer 10 is wound and coated on the outer side of the joint of the connecting pipe 9 and the corrugated aluminum sheath; (7) a semi-conductive buffer water-blocking tape layer 11 which is positioned between the front end of the outer sheath 1 and the front end of the ring groove 8 and is wrapped outside the corrugated aluminum sheath section 4, the waterproof insulating tape outer layer 10 and the connecting pipe 9 is wound by the semi-conductive buffer water-blocking tape; (8) screwing an internal thread arranged at the large end of the stepped shaft-shaped connecting section 19 with an external thread arranged at the rear end of the accommodating counter bore 20, and installing a back-twist traction device; (9) and (3) coating the heat-shrinkable sleeve 21 on the front part of the outer sheath 1, the semi-conductive buffering water-blocking tape layer 11, the traction head, the rear section 12 and the conical section 14, and uniformly heating and plastically packaging.
In addition to the above embodiments, the technical features or technical data of the present invention may be reselected and combined to form new embodiments within the scope of the claims and the specification of the present invention, which are all realized by those skilled in the art without creative efforts, and thus, the embodiments of the present invention not described in detail should be regarded as specific embodiments of the present invention and are within the protection scope of the present invention.
Claims (6)
1. A untwisted waterproof high-voltage cable pulling head comprising: by the conductor, wrap up the high tension cable that insulating cover, wrinkle aluminium sheath and the oversheath constitutes outside the conductor in proper order, characterized by, back twist reverse waterproof high tension cable traction head still include: a traction head provided with a back-twist traction device; the front end of the high-voltage cable is provided with a stepped shaft-shaped exposed section consisting of a conductor section, an insulating sleeve section and a corrugated aluminum sheath section; the traction head includes: the rear end is provided with a compression joint hole which is sleeved outside the conductor section and a traction body which is compressed with the conductor section, a waterproof insulating adhesive tape inner layer which is coated outside the insulating sleeve, a ring groove which is arranged at the outer side wall of the rear end of the traction body, connecting pipes of which the two ends are connected with the ring groove side wall and the outer side wall of the corrugated aluminum sheath section in a one-to-one correspondence manner, a waterproof insulating adhesive tape outer layer which is coated outside the connecting pipe and the joint of the corrugated aluminum sheath, and a semi-conductive buffering water-blocking tape layer which is coated outside the corrugated aluminum sheath section, the waterproof insulating adhesive tape outer layer and the connecting pipe.
2. The untwisted waterproof high-voltage cable pulling head as claimed in claim 1, wherein the untwisted pulling device comprises: the traction device comprises a rear traction rod, a front traction rod, a traction groove and a traction pull column, wherein the rear traction rod consists of a rear section, a front section with the diameter smaller than that of the rear section, and a conical section with two ends respectively connected with the front end of the rear section and the rear end of the front section; the rear end of the traction body is provided with a stepped shaft-shaped connecting section which is positioned in the containing counter bore, and the small end of the stepped shaft-shaped connecting section is positioned on the front side; the big end of the stepped shaft-shaped connecting section is provided with an external thread which is in threaded connection with the internal thread.
3. The untwisted waterproof high-voltage cable pulling head according to claim 2, further comprising: the heat-shrinkable sleeve is coated on the front part of the outer sheath, the semi-conductive buffering water-blocking tape layer, the traction head, the rear section and the conical section; the overlapping length of the thermoplastic sleeve and the cable outer sheath is 90mm to 110 mm.
4. The untwisted waterproof high-voltage cable pulling head as claimed in claim 1, 2 or 3, wherein the inner layer of the waterproof insulating tape is formed by overlapping and winding two layers of waterproof insulating tapes, and the overlapping rate is 50% to 60%; the elongation of the waterproof insulating tape is 30% to 50%.
5. The untwisted waterproof high-voltage cable pulling head as claimed in claim 1, 2 or 3, wherein the outer layer of the waterproof insulating tape is formed by overlapping and winding two layers of waterproof insulating tapes, and the overlapping rate is 50% to 60%; the elongation of the waterproof insulating tape is 30% to 50%.
6. The untwisted waterproof high-voltage cable pulling head as claimed in claim 1, 2 or 3, wherein the semi-conductive buffering water-blocking tape layer is formed by lapping and covering the semi-conductive buffering water-blocking tape, and the lapping rate is 50% to 60%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121601976.6U CN215934316U (en) | 2021-07-13 | 2021-07-13 | Back-twist waterproof high-voltage cable traction head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121601976.6U CN215934316U (en) | 2021-07-13 | 2021-07-13 | Back-twist waterproof high-voltage cable traction head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215934316U true CN215934316U (en) | 2022-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121601976.6U Active CN215934316U (en) | 2021-07-13 | 2021-07-13 | Back-twist waterproof high-voltage cable traction head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215934316U (en) |
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2021
- 2021-07-13 CN CN202121601976.6U patent/CN215934316U/en active Active
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