RU204913U1 - Tension clamp - Google Patents

Abstract

The utility model relates to the power industry, in particular to tension clamps for hanging aluminum and steel-aluminum electrical bare wires of overhead power lines, aluminum wires with a composite core. Tension clamp containing a body, an anchor installed in the body. The body of the clamp is made of a pipe with an increased inner diameter on one side, the body has a hole for filling with a compound, the pressed part of the anchor is completely hidden inside the body. EFFECT: increased reliability of the tension clamp. 4 ill.

Description

The utility model relates to the power industry, in particular to tension clamps for hanging aluminum and steel-aluminum electrical bare wires of overhead power lines, aluminum wires with a composite core.

Known tension clamp for attaching a wire with a composite core to an anchor-angle support of a power line according to patent No. 123243, published on 12/20/2012, containing an electrically conductive housing with a shank for a loop wire, a steel anchor with an eyelet for linear reinforcement and a cavity for the end of the composite core, tapered a collet for a composite core and a steel sleeve with a hole for a tapered collet, while the sleeve and anchor are made with the possibility of threaded connection, and the body is made with the possibility of crimping it on the anchor and on the conductive wire strand. The disadvantages of the known tension clamp according to patent No. 123243 are complex design, high metal content and use only for wire with a composite core.

The closest analogue to the utility model is the pressing tension clamp NAS-330-2 (http://www.gig-group.com/catalog/zazhimy_natyazhnye_pressuemye_tipa_nas/zazhim_natyazhnoy_pressuemyy_nas_330_2/).

The disadvantages of the NAS-330-2 clamp is the difficult installation of the wire going into the loop due to repeated raising and lowering of the wire from the traverse to the ground or forced pressing at a height. Retention of the wire occurs due to a complex collet and wedge system to manufacture. The retention of the wire in the proposed solution occurs due to the crimping of the body and the anchor. Also, the disadvantages include low reliability due to the lack of proper protection against corrosion of the anchor after pressure testing.

The technical problem solved by the utility model is the expansion of the arsenal of technical means, namely tension clamps for fixing and holding aluminum, steel-aluminum and aluminum wires with a composite core.

EFFECT: increased reliability of the tension clamp.

An additional technical result is the creation of a tension clamp of a simplified design with increased ease of installation.

To achieve the technical result in a tension clamp containing a body, an anchor installed in the body, according to the utility model, the body of the clip is made of a pipe with an increased inner diameter on one side, the body has a hole for filling with a compound, the pressed part of the anchor is hidden inside the body entirely.

To achieve an additional technical result, a terminal block is welded to the body, to which the loop is connected, the terminal block is connected to the loop through bolts, washers, grovers and nuts.

The presence of a hole in the housing allows it to be filled with a compound, which prevents moisture from entering the inner cavity of the clamp, protects the anchor from corrosion and increases the electrical conductivity between the wire and the housing, and also increases the mechanical load. Due to the fact that the pressed part of the anchor is completely hidden inside the body, it is completely protected from corrosion. As a result of the obtained protection of the anchor from corrosion and an increase in the mechanical load, the clamping reliability is increased.

The manufacture of the clamp body from a pipe, in which on one side the inner diameter is increased or the outer diameter is reduced, allows to reduce the stress in the metal from the crimping dies, and, consequently, to increase the reliability of the clamp.

The presence of a terminal block welded to the body to which the loop is connected, the connection of the terminal block with the loop through bolts, washers, grovers and nuts eliminates the need to connect the loop with thermite cartridges or loop clamps and at any time you can disconnect the line without cutting the wire by simply disconnecting the bolts, as a result of which the convenience and speed of installation increases. Thus, a tension clamp of increased reliability is created, with a simplified design with increased ease of installation.

The essence of the utility model is illustrated by drawings:

in fig. 1 shows a general view of the tension clamp;

in fig. 2 is a left side view of the tension clamp;

in fig. 3 - internal and external cavity of the body;

in fig. 4 - an integral part of the anchor.

The tension clamp for aluminum, steel-aluminum and aluminum wires with a composite core has an aluminum case 1. The clamp is completely made of non-magnetic alloy, which ensures the openness of the magnetic circuit of the clamp and the reduction of magnetization reversal losses.

The body 1 of the clamp is made of a pipe in which on one side the inner diameter 2 is increased or the outer diameter 3 is reduced. This is done in order to reduce the stress in the metal from the crimping dies, and, consequently, to increase the clamping reliability. Outside there is a marking in the form of machined rings for visibility of the crimping points. In addition, a hole 4 is made in the body for possible filling with a special compound. The compound prevents moisture from entering the inner cavity of the clamp, protects the anchor from corrosion and increases the electrical conductivity between wire 5 and body 1. It also increases mechanical stress. As a result of the obtained protection against corrosion, an increase in the mechanical load, the clamping reliability is increased.

The anchor 6 is inserted from the side into the hole in the housing 1 until it stops. Anchor 6 is made of rolled steel by stamping.

Conventionally, the anchor 6 consists of three parts: the first part is a part for a steel or composite wire core, the second part is a part of attachment to the body 1 and the third part is a part of the connection with subsequent reinforcement in a garland.

The anchor 6 for the aluminum wire has no part for the steel or composite core.

In the part for the steel or composite core, a hole 7 is made, which is filled with anti-corrosion grease and closed with a plug 8. The hole 7 is used to install a steel wire core in it, and an additional copper insert is installed for the composite core. After installation in the hole in the core of the wire, this part of the anchor 6 is pressed with hex dies. The pressed part of the anchor 6 is hidden inside the body 1 as a whole, thanks to which it is completely protected from corrosion.

The part of the attachment to the body 1 has a circular cross-section D, slightly smaller than the body 1. On the outer surface, the part of the attachment to the body 1 has grooves 9 located with a certain pitch. The metal flows into the grooves 9 during the pressure testing of the body, forming a single whole from the body 1 and the anchor 6.

The part of the connection with the subsequent reinforcement in the garland can be made with a foot, eyelet or chain connection for possible assembly with any mating suspension part. The chain connection will dampen the vibration coming from the wire.

A terminal block 10 is welded to the housing 1 through a hole slightly larger than the outer diameter of the housing. Terminal block 10 is made of sheet aluminum alloy. Terminal 10 can be welded at any angle. In the terminal box 10 there are holes for a bolted connection with a loop 11 through bolts 12, washers 13, grovers 14 and nuts 15. The contact point of the terminal box 10 and the loop 11 is pre-cleaned and covered with a highly conductive paste.

The loop 11 is made of an aluminum pipe, at the end having a platform obtained by stamping or welding. On the site there are holes for assembly with a terminal block 10. Outside there is a marking in the form of a turned ring for visibility of the crimping point. Stub 11 has a deviation from the vertical of 30 ° or more. This angle makes it possible to install the loop on the other side of the terminal block 10. This is extremely important for transposition.

The presence of a terminal block 10 and a loop 11 ensures easy and quick installation.

Additionally, the clamp can be completed with a ball 16, which closes the hole 4 in the housing 1 after filling the latter with a compound. The ball 16 is packed in a bag 17 and is securely attached to the body 1 by means of an adhesive tape 18.

The clamp is mounted on the wire as follows.

Straighten the wire to remove rings and kinks. This is extremely important. The wire should be as straight as possible for correct installation. Cut the wire exactly so that all the wires are the same length. Wrap the wire with tape near the cut so that the wires lie flat. If the wire is damaged, it must be cut so that all damaged strands are removed. The following sequence of steps is different depending on the wire used.

For steel-aluminum wire and wire with a composite core: the first mark on the wire must be made by wrapping the wire with tape at a distance of 1.2 times the length of the anchor hole 6. Make the second mark on the wire by wrapping the wire with tape at a distance from the edge of the first mark specified in installation documentation. Remove aluminum strands of wire up to the first mark.

For aluminum wire: the first mark on the wire must be made by wrapping the wire with tape from the edge at the distance specified in the installation documentation.

For all types of wires, push the body 1 of the clamp onto the prepared end of the wire. The following sequence of steps is different depending on the wire used.

For steel-aluminum wire: remove the plug on the anchor 6 8. Push the anchor 6 onto the steel core of the wire prepared for crimping 6. Press the anchor part 6 with hex dies in the direction of the arrow indicated on the anchor 6. Push the housing 1 onto the pressed anchor 6. part of the body 1, where the anchor 6 is located in the direction of the arrow indicated on the body 1.

For wire with composite core: Remove plug 8 on anchor 6. Insert a copper gasket into the anchor hole 6. Push the anchor 6 onto the composite wire core prepared for crimping. Press the anchor part with the hexagonal dies in the direction of the arrow indicated on the anchor 6. Push the housing 1 onto the pressed anchor 6. Press the housing 1 with the hexagonal dies, where the anchor 6 is located in the direction of the arrow, indicated on the body 1.

For aluminum wire: Push the housing 1 onto the anchor 6. Press the housing 1 part, where the anchor 6 is located, in the direction of the arrow indicated on the housing 1 with hex dies. Insert the prepared end of the wire until it stops into the housing hole 1.

The further sequence is the same for any wire.

Pump the compound through the hole in the housing 1. The compound protects the steel core from rust and increases the mechanical stress on the clamp. Seal the hole with a ball 16. Crimp the part of the body 1, where the wire is located in the direction of the arrow indicated on the body 1, with hex dies.

Insert the other end of the cut wire into the loop hole 11 until it stops. Crimp the loop 11 with hex dies, the part of the loop 11, where the wire is located in the direction of the arrow indicated on the loop 11. Docking the loop 11 and the terminal block 10, after applying contact paste to the connection point, using bolts 12, washers 13, grovers 14 and nuts fifteen.

The proposed clamp provides reliable fixation of the wire, while the cable can be crimped separately from the clamp. It has a simple design, increased reliability, easy to manufacture, convenient and safe during installation.

Claims (1)

Tension clamp containing a body, an anchor installed in a body, characterized in that the body of the clip is made of a pipe with an increased inner diameter on one side, the body has a hole for filling with a compound, the pressed part of the anchor is hidden inside the body entirely.

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