CN105181443A - Horizontal tension tester's fixture for round wire concentric-lay-stranded overhead conductors - Google Patents

Abstract

The invention relates to a clamp for a round wire concentric stranded overhead wire used in a horizontal tensile testing machine. It includes a pair of clamping mechanisms with the same specifications. Each pair of clamping mechanisms includes a pair of clamping blocks and a pair of clamping shells; a pair of clamping blocks is composed of two clamping blocks corresponding to the jaws. The two clamping blocks are respectively There are groove-shaped jaws for clamping round concentric stranded overhead wires. The jaw end of a pair of clamp blocks is the clamping end, and the corresponding other end is the positioning end; a pair of clamp shells are fixed by two corresponding matching pieces. The two fixed bodies are respectively provided with clamping block grooves; a pair of clamping blocks are correspondingly located in the clamping block grooves of a pair of fixture shells, and the clamping ends of a pair of clamping blocks are located outside a pair of fixture shells, and the clamping blocks A pair of fixture shells on the outer periphery of the groove are fixedly connected through threaded connectors. When in use, a pair of clamping mechanisms hold the two ends of the overhead wire respectively, and realize self-locking when the force is applied; by changing clamping blocks of different sizes, it is suitable for overhead wires with different cross-sectional areas.

Description

A clamp for round wire concentric stranded overhead wire used in horizontal tensile testing machine

technical field

The invention belongs to the technical field of stress-strain detection of round wire concentric stranded overhead wires, and in particular relates to a clamp for round wire concentric stranded overhead wires suitable for a horizontal tensile testing machine.

By changing the size of the jaws, it can be applied to round wire concentric twisted overhead conductors with different cross-sectional areas, which is simple and efficient.

Background technique

Round wire concentric stranded overhead wire refers to a wire twisted with one or more layers of single wires spirally twisted around one or a bunch of central wire cores, and the adjacent layers are twisted in opposite directions. The round wire concentric stranded overhead conductor needs to be laid overhead, so the conductor itself will bear a certain tension. If the rated tensile strength of the overhead conductor is unqualified, it is easy to cause a disconnection accident. In addition, the overhead wire will have a certain degree of strain under the action of tension, especially in the case of ice, the tension will increase greatly. If the strain is too large, the sag of the overhead wire may exceed the safe range. Stress-strain testing is critical. When the stress-strain curve test is performed on the wire, both ends of the sample need to be clamped. The wire clamping methods include casting method, sleeve pressure method, winding method and direct clamping method. The direct clamping method has the characteristics of easy operation. However, the traditional chuck is generally complex in structure and heavy in weight. When used on a horizontal tensile testing machine, its own gravity has a certain degree of influence on the test results.

Contents of the invention

The object of the present invention is to overcome the above-mentioned disadvantages in the prior art, and provide a clamp for round wire concentric stranded overhead conductors with small dead weight and simple operation for a horizontal tensile testing machine.

The specific technical solutions are as follows:

A clamp for round wire concentric stranded overhead wires used in a horizontal tensile testing machine, comprising a pair of clamping mechanisms with the same specifications, each pair of clamping mechanisms includes a pair of clamping blocks and a pair of clamping shells; a pair of clamping blocks consists of The clamping blocks corresponding to the two clamping jaws are combined, and the two clamping blocks are respectively provided with groove-shaped jaws for clamping the round wire concentric twisted overhead wire; the jaw end of a pair of clamping blocks is the clamping end, The corresponding other end is the positioning end; a pair of clamp shells is composed of two correspondingly matched fixed bodies, and the two fixed bodies are respectively provided with sliding grooves; In the locked state, the clamping ends of a pair of clamping blocks are located outside the pair of clamping shells, and the pair of clamping shells on the outer periphery of the sliding groove are fixedly connected by threaded connectors;

When in use, a pair of clamping mechanisms respectively clamp the two ends of the round wire concentric stranded overhead conductors.

The clamping block is a right-angled trapezoidal block, and the jaw is located on one right-angled side of the clamping block, and is in a through shape; two clamping blocks cooperate to form an isosceles trapezoidal block.

The cross section of the jaw is V-shaped or arc-shaped.

The fixed body is in the shape of a rectangular plate, the outer end of the sliding groove is located at the edge of one side of the fixed body in the length direction, the sliding groove extends to the middle of the fixed body in a groove shape, and the sliding groove is an outer end with a smaller inner end A large wedge-shaped groove, with a limit block inside, and the outer end of the sliding groove is located at the edge of one side of the fixed body; the pair of clamping blocks are located in the sliding groove of a pair of clamp shells, and the clamping end extends to the fixed body Outside, the positioning end is in contact with the limit block, and is in a self-locking state; the fixed body at the inner end of the sliding groove is provided with mounting holes; the two sides of the fixed body in the width direction are respectively equipped with more than three connecting holes.

Beneficial technical effect of the present invention is embodied in the following aspects:

1. The clamp of the present invention can realize the clamping of round concentric stranded overhead conductors with different cross-sectional areas. The clamp is fastened by bolts and self-locking when force is applied.

^2. The present invention can clamp concentrically stranded overhead conductors of round wires with a cross-sectional area of 10-1200mm2 by replacing clamping blocks of jaws of different sizes. If V-shaped jaws are used, it is suitable for clamping steel strands. The arc-shaped jaws can increase the contact area between the wire and the jaws, and reduce the probability of broken strands or wires in the jaws or near the jaws. It is suitable for aluminum stranded wire, steel-cored aluminum stranded wire or other aluminum and steel Combine wires.

3. By wrapping 0.1mm thick aluminum foil or aluminum strip on the wire, it can further reduce the probability of aluminum stranded wire, steel cored aluminum stranded wire or other combined aluminum and steel wire breaking in or near the jaws.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic diagram of the structure of the fixture shell.

Figure 3 is a schematic diagram of the clamping block structure.

Serial number in the above picture: fixed body 1, clamping block 2, round wire concentric strand overhead wire 3, sliding groove 11, connection hole (bolt hole) 12, limit block 13, installation hole (tension testing machine connection hole) 14 , fixed body 15, V-shaped jaw 21, arc-shaped jaw 22.

Detailed ways

The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.

Example 1

Referring to Fig. 1 , a round wire concentric stranded overhead wire clamp for a horizontal tensile testing machine includes a pair of clamping mechanisms with the same specifications, and each pair of clamping mechanisms includes a pair of clamping blocks and a pair of clamp shells.

Referring to Fig. 3, a pair of clamping blocks is composed of clamping blocks 2 corresponding to two clamping jaws. The two clamping blocks are respectively provided with groove-shaped jaws 21 for clamping round concentric stranded overhead conductors. The mouth 21 is a V-shaped jaw; the clamping block 2 is a right-angled trapezoidal block, and the jaw 21 is located on one side of the clamping block 2 at a right angle, and is in a through shape. Two clamping blocks 2 cooperate to form an isosceles trapezoidal block. The jaw ends of a pair of clamping blocks are clamping ends, and the corresponding other ends are positioning ends.

Referring to FIG. 2 , a pair of clamp shells is composed of two correspondingly matched fixed bodies 1 , and the two fixed bodies 1 are respectively provided with sliding grooves 11 in the length direction, and the sliding grooves 11 are wedge-shaped grooves. The fixed body 1 is in the shape of a rectangular plate, and the outer end of the sliding groove 11 is located at the edge of one side in the length direction of the fixed body 1, and extends to the middle of the fixed body 1 in a groove shape, and the sliding groove 11 is small at the outer end and large at the inner end. A wedge-shaped groove with a limiting block 13 inside; a pair of clamping blocks are located in the sliding groove 11 of a pair of fixture shells, the clamping end extends to the outside of the fixed body 1, and the positioning end contacts the limiting block 13, showing a self-locking state; Mounting holes 14 are provided on the fixed body 1 at the inner end of the sliding groove 11; five connection holes 12 are evenly distributed on both sides of the fixed body 1 in the width direction, and a pair of clamping blocks are fixed by threaded connectors. Clamped within a pair of clamp housings.

When in use, a pair of clamping mechanisms respectively clamp the two ends of the round wire concentric stranded overhead conductor 3 .

Take the steel strand overhead wire as an example, first put a pair of clamp blocks into the sliding grooves 11 of a pair of fixture shells, put the two ends of the steel strand overhead wire into the middle of the V-shaped jaws of a pair of clamp blocks respectively, and then A pair of clamp shells are fixedly connected through threaded connectors, so that the two ends of the steel strand overhead conductors are clamped. Then, the stress-strain test can be carried out on the steel strand overhead wire through the horizontal tensile testing machine. When the horizontal tensile testing machine starts to apply force, the clamp realizes self-locking, and the steel strand overhead wire cannot slip out of the jaws of the clamp block.

When it is necessary to test steel strands with different cross-sectional areas, it is sufficient to select clamping blocks with V-shaped jaws of corresponding specifications according to the cross-sectional areas of the wires.

Example 2

When testing aluminum stranded aerial conductors, steel-cored aluminum stranded overhead conductors, or other combined aluminum and steel conductors, it is necessary to wrap aluminum foil or aluminum strips at both ends of the overhead conductors first, and select a clamp with an arc-shaped jaw 22 of corresponding specifications. block, see Figure 3. Other steps are with embodiment 1.

Claims (4)

1., for a round line concentric gallows empty conductor fixture for horizontal tensile testing machine, it is characterized in that:

Comprise the clamping device that a pair specification is consistent, often pair of clamping device comprises a pair fixture block and a pair fixture shell; A pair fixture block is coordinated by the grip block that two pieces of jaws are corresponding and forms, and two pieces of grip blocks offers respectively the jaw of the channel-shaped for clamping round line concentric gallows empty conductor; The vice jaw part of a pair fixture block is bare terminal end, and the corresponding other end is positioning end; A pair fixture shell is made up of the fixed body of two pieces of corresponding matching, and two pieces of fixed bodies are respectively equipped with slippage slot; The slippage slot that a pair fixture block is positioned at a pair fixture shell is self-locking state, and the bare terminal end of a pair fixture block is positioned at the outside of a pair fixture shell, is threaded connection part and is fixedly connected with between a pair fixture shell of slippage slot periphery;

During use, a pair clamping device holds the two ends of round line concentric gallows empty conductor respectively.

2. a kind of round line concentric gallows empty conductor folder for horizontal tensile testing machine according to claim 1, is characterized in that: described grip block is right-angled trapezium block, and described jaw is positioned on the side right-angle side of grip block, and in through shape; Two pieces of grip blocks coordinate composition isosceles trapezoid block.

3. a kind of round line concentric gallows empty conductor folder for horizontal tensile testing machine according to claim 1 and 2, is characterized in that: the xsect of described jaw is V-arrangement or circular arc.

4. a kind of round line concentric gallows empty conductor folder for horizontal tensile testing machine according to claim 1, it is characterized in that: described fixed body is rectangular plate-like, the outer end of described slippage slot is positioned at the edge of the length direction side of fixed body, slippage slot extends in the middle part of fixed body in groove-like, slippage slot is the large wedge-shaped slot in little the inner, outer end, inside is provided with limited block, and the outer end of slippage slot is positioned at the edge of the side of fixed body; Described a pair fixture block is positioned at the slippage slot of a pair fixture shell, and bare terminal end extends the outside of fixed body, and positioning end contacts with limited block, in self-locking state; The fixed body of the inner of slippage slot offers mounting hole; The dual-side of the Width of fixed body is laid with respectively the connecting hole of more than three.