CN203645279U - Slidable suspension clamp - Google Patents

Abstract

The utility model relates to a slidable hanging wire clip, in particular to a slidable hanging wire clip which can automatically adjust the tension of the wires of the power transmission line when the local tension of the power transmission line is too large. It includes the clamp hull, U-shaped screws, U-shaped screw nuts, pressure strips and pre-twisted wires; it is characterized in that: it also includes wire pressure blocks, springs and constant torque screws; the pressure strips are installed on the U-shaped screws, and the wires are pre-twisted A wire pressing block is installed between the wire and the pressing bar, the fixed torque screw passes through the pressing bar and is threadedly connected with the wire pressing block, and the spring sleeve is located on the surface of the fixed torque screw and is located on the pressing bar. It is used for any type of conductor of the straight tower of overhead transmission lines of 110 kV and above, and is suitable for transmission lines with a span of more than 300 meters. It reduces the friction that the wire needs to overcome in the state of extreme unbalanced force. When the unbalanced tension of the wires on both sides of the tower reaches 5%, the constant torque screw will undergo shear strain and then break, losing the fastening effect, and releasing the wire to eliminate the limit unbalance. Balance tension.

Description

Slidable Suspension Clamp

technical field

The utility model relates to a slidable hanging wire clip, in particular to a slidable hanging wire clip which can automatically adjust the tension of the wires of the power transmission line when the local tension of the power transmission line is too large. the

Background technique

Transmission line fittings are responsible for the important mission of safe power supply, and play the role of transmitting mechanical loads, electrical loads and special protection. The material selection and process quality are produced in accordance with the requirements of mechanical strength, wear resistance, corrosion and other conditions. of.

With the damage of icing to the power grid lines in this century, the maximum ultimate tension load will be generated due to external factors such as icing, which will cause the tower structure to be stressed unevenly, and the tower will be broken or broken, and the tower or broken line will cause emergency repairs. Difficulties, delays in power supply reliability.

The existing method of hanging wires on straight poles and towers of overhead transmission lines in power systems is to use XGU-type fixed clamps. The principle is to use U-shaped screws and pressure strips to squeeze the wires into the hull of the clamp, and run normally on overhead transmission lines. Under normal circumstances, the conductors are squeezed by U-shaped screws and pressure strips for a long time in the hull of the cable clamp. At the same time, under the action of vibration load, the mechanical strength of the conductors will be greatly reduced, and the expected service life will not be reached and damage will occur. In the case of a disconnection fault on the overhead transmission line, because the wire cannot be pulled out from the clamp under the action of the extreme unbalanced tension, the tower will be damaged to a certain extent, and the tower will collapse in severe cases.

In order to ensure the safe operation of line equipment under severe weather conditions, reduce capital investment, optimize power grid equipment in local areas, ensure that line equipment damage is minimized under special weather conditions, and improve the ability of transmission lines to resist disasters, it is necessary to study and Line fittings suitable for equipment health level. the

Contents of the invention

The purpose of this utility model is to solve the problem that the suspension wire can break free from the extrusion of the U-shaped screw and the bead under the limit unbalanced tension, release the limit unbalanced tension in time, and prevent the structure from twisting or falling down on the iron tower.

The implementation of the utility model is: a slidable suspension wire clamp, including the wire clamp hull, U-shaped screw, nut of the U-shaped screw, bead and wire pre-twisted; And the constant torque screw; the pressure bar is installed on the U-shaped screw, the wire pressure block is installed between the pre-twisted wire and the pressure bar, the constant torque screw passes through the pressure bar and is threaded with the wire pressure block, and the spring sleeve is located on the surface of the constant torque screw and is located on the pressure bar.

The suspension wire clamp provided by the utility model adopts a sitting-stand bolt type structure. Under the premise that the main parameters such as the original wire clamp material, bolt connection, connection mode, shape, and size are not changed, only the shape of the wire clamp pressure strip is changed. The structure makes the original one bead into two pieces, and the bead is widened and opened and installed on the U-shaped screw. The material of the bead matches the material of the original wire clamp. It is made of A3 steel or ordinary steel plate by stamping. It satisfies the original mechanical strength and holding force of the wire clamp, and ensures that the wire clamp can not only meet the needs of general operating conditions, but also meet the release of the limit unbalanced tension of the wire under special conditions; the changed bead is according to the suspension wire clamp U The type and size of the type screw, punch the eye hole for the U-shaped screw in the bead, and cover the U-shaped nut on the bead when in use to prevent the bead from falling off, so that the bead no longer bears the extrusion force, and It is to protect the wire from coming out of the wire clamp hull; to control the constant torque screw and to be able to be tightened and loosened freely.

Since the fixed torque screw is easy to break when it exceeds its preload, the fixed torque screw screw is covered with a spring to prevent vibration and falling off. The spring must have strong elastic deformation and is not easy to permanently fail under the maximum torque extrusion; The wire pressing block that squeezes the wire is installed at the lower end of the constant torque nut. When the constant torque nut is tightened, the wire pressing block can fasten the wire together with the clamp hull. When the wire pressing block clamps the wire, it will produce point contact. The acting force reduces the contact surface of the wire in the clamp hull and reduces the friction force that needs to be overcome when the wire slides; when the wire bears the ultimate unbalanced tension, the wire pressing block that touches the wire at a point will produce shear or torsional deformation and Transfer to the constant torque nut screw, so that the shear surface is generated on the constant torque screw, and when the excessive shear force or torque exceeds the maximum shear force of the constant torque screw, it will break at the easily broken part and lose the effect of restraining the wire; After the constant torque screw breaks, the wire pressing block also loses its fastening effect, and the wire is in a state of free movement. The wire moves freely according to the principle of force balance. When the tension is adjusted to achieve balance, the limit unbalanced tension will be removed without affecting the connection with the wire. Twist the structure of the iron tower; when the wire is in a free-moving state, the wire will not come out of the clamp hull or fall to the ground because the bead installed on the U-shaped screw plays a role.

The utility model is used for any type of wire of the straight pole tower of the overhead power transmission line of 110 kV and above, and is suitable for the power transmission line with a span of more than 300 meters. The utility model is characterized in that it completely changes the basic shape and structure of the inner bead of the original suspension wire clamp, reduces the holding force of the wire clamp hull surface-to-surface contact, and reduces the friction that the wire needs to overcome in the state of extreme unbalanced force reduce the risk of twisting or falling of the tower due to the extreme unbalanced tension of the wire; the initial preload of the constant torque screw has the ability to withstand a certain shear force, when the unbalanced tension of the wires on both sides of the tower reaches 5% When the constant torque screw occurs shear strain and then breaks, the fastening effect is lost, and the wire is released to eliminate the extreme unbalanced tension.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the side view of Fig. 1;

Fig. 3 is the structural representation of bead;

Fig. 4 is a schematic diagram of the structural relationship between the constant torque screw and the wire pressing block.

In the figure: 1—clamp hull, 2—U-shaped screw, 3—nut of U-shaped screw, 4—layering strip, 5—pre-twisted wire, 6—conducting wire, 7—conducting wire pressing block, 8—threaded hole, 9—spring, 10—fixed torque screw, 11—U-shaped screw mounting hole.

Detailed ways

The utility model is described in detail below with reference to accompanying drawing and embodiment. As shown in Figure 1, Figure 2 and Figure 4: a suspension clamp used on overhead transmission lines in power systems, including a clamp hull 1, U-shaped screws 2, nuts 3 for U-shaped screws, bead 4 and Conductor pre-twisted wire 5; also includes wire press block 7, spring 9 and constant torque screw 10; press bar 4 is installed on U-shaped screw 2, and wire press block 7 and constant torque screw 10 are installed between lead wire pre-twisted wire 5 and press bar 4 Through the pressure bar 4 and threaded connection with the wire pressure block 7, the spring 9 is sleeved on the surface of the fixed torque screw 10 and is located on the pressure bar 4.

See Fig. 3: the bead 4 is provided with two U-shaped screw mounting holes 11, and a threaded hole 8 is provided between the two U-shaped screw mounting holes 11, and the constant torque screw 10 passes through the threaded hole 8 and is threadedly connected with the wire pressing block 7; The bead 4 has a thickness of 10-15 mm.

Referring to FIG. 2 , the lower end of the wire pressing block 7 is an arc, and the arc is adapted to the outer surface of the pre-twisted wire 5 .

The installation and working process of the utility model are roughly as follows: After the wire 6 is wound around the wire pre-twisted wire 5, it is installed in the groove of the wire clamp hull 1, the U-shaped screw 2 is inserted into the wire clamp hull 1, and then the hanging wire is clamped with the pressure strip 4 Set in the U-shaped screw 2, after installing the washer, cover it with double U-shaped nuts 3, when tightening the wire 6, install the fixed torque screw 10 with the spring 9 in the threaded hole 8, the fixed torque screw 10 screw The lower end is equipped with a wire pressing block 7, and gradually moves the wire pressing block 7 to clamp the wire according to the initial preload of the constant torque screw 10 screw rods, so that the wire can not be drawn out under normal operating conditions, and vibration displacement does not occur. When the wire 6 produces limit unbalanced tension, the force on the wire pressing block 7 fastening the wire 6 will increase rapidly, and through the interaction of forces, the wire pressing block 7 will transmit the action force to the constant torque screw 10, so that The fixed torque screw 10 produces a large shear force at the screw rod. When the fixed torque screw 10 screw cannot bear its rated maximum load, a shear surface that is easy to break will be generated. The fixed torque screw 10 screw breaks, and the wire clamp 7 loses The role of fastening the wire 6, the wire 6 is in a state of free sliding, through the principle of force balance, the wire 6 will remove the excess unbalanced tension by itself, because the bead 4 is installed in the U-shaped screw 2, and there is a U-shaped nut 3 Covering, the wire 6 can only move freely in the wire clip hull, and will not cause the twisting or falling of the iron tower. the

Claims (4)

1. A slidable suspension clamp, including the clamp hull, U-shaped screws, U-shaped screw nuts, beading and pre-twisted wires; it is characterized in that: it also includes a wire pressing block (7), a spring (9) and the constant torque screw (10); the pressure bar (4) is installed on the U-shaped screw (2), the wire pressure block (7) is installed between the wire pre-twisted wire (5) and the pressure bar (4), and the constant torque screw (10) passes through The pressure bar (4) is threadedly connected with the lead pressing block (7), and the spring (9) is sleeved on the surface of the constant torque screw (10) and is positioned on the top of the pressure bar (4). 2. A slidable suspension clamp as claimed in claim 1, characterized in that: the bead (4) is provided with two U-shaped screw mounting holes (11), between the two U-shaped screw mounting holes (11) A threaded hole (8) is provided, and the torque-fixing screw (10) passes through the threaded hole (8) and is threadedly connected with the wire pressing block (7). 3. A slidable suspension clamp according to claim 1 or 2, characterized in that: the lower end of the wire pressing block (7) is an arc, and the arc is adapted to the outer surface of the pre-twisted wire (5). 4. A slidable suspension clamp according to claim 3, characterized in that the thickness of the bead (4) is 10-15mm.

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