CN113241701B

CN113241701B - Strain clamp

Info

Publication number: CN113241701B
Application number: CN202110650888.3A
Authority: CN
Inventors: 周材力
Original assignee: Zhejiang Dahongmen Power Equipment Co ltd
Current assignee: Zhejiang Dahongmen Power Equipment Co ltd
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2022-11-15
Anticipated expiration: 2041-06-10
Also published as: CN113241701A

Abstract

The utility model provides a light strain clamp, includes fastener main part, briquetting, U-shaped screw, packing ring, nut, its characterized in that: the wire clamp comprises a wire clamp body and is characterized in that a groove for a wire to pass through is formed in the wire clamp body along the axial direction, a pressing block is arranged in the groove, a U-shaped screw passes through a screw hole of the wire clamp body and is fixed through a gasket and a nut, and the wire clamp body is prepared from continuous fiber reinforced polyamide resin.

Description

Strain clamp

Technical Field

The application relates to a strain clamp

Background

The strain clamp is a hardware fitting used for fixing a lead to bear the tension of the lead and hanging the lead to a strain insulator-string group or a tower; the strain clamp is mainly used for corner turning, connection and terminal connection; in the process of using the strain clamp, the high-voltage wire needs to be limited, so that the high-voltage wire can not deviate under the influence of wind power.

The conventional strain clamp usually adopts the friction acting force of the clamp and other matched components to clamp or loosen the stranded wire, but the locking of the stranded wire by the mode has great limitation, firstly, the stranded wire cannot be effectively clamped by the action of the friction force, so that the locking effect of the stranded wire is poor; secondly, the change of environment can arouse the change of fastener friction power itself for some are originally locked complete stranded conductor and appear the problem of unclamping because of the environment changes, influence the locking effect of user to the stranded conductor originally, and the direct clamp with the stranded conductor of the locking device of majority can cause the damage to the wire.

In addition, most of the existing strain clamps are made of metal, so that the strain clamps are heavy and high in cost. Although some reports of plastic strain clamps exist, the mechanical properties of the strain clamps are not too critical, and the strain clamps cannot replace metal strain clamps.

Disclosure of Invention

The invention aims to solve the problems that the locking effect is poor and a locking device damages a wire in the prior art, and provides a strain clamp which can provide a clamping effect on a stranded wire and simultaneously avoid damage to the stranded wire by the locking device.

The invention also aims to solve the problem of high cost in the weight of the metal strain clamp in the prior art, and provides the polymer light strain clamp which has better mechanical property.

In order to achieve the above object, the present invention adopts the following aspects.

The utility model provides a light strain clamp, includes fastener main part, briquetting, U-shaped screw, packing ring, nut, its characterized in that: the wire clamp main body is provided with a groove for a wire to pass through along the axial direction, a pressing block is arranged in the groove, and the U-shaped screw passes through a screw hole of the wire clamp main body and is fixed by a gasket and a nut;

the cable clamp is further characterized in that the cable clamp main body is prepared from continuous fiber reinforced polyamide resin,

the preparation process comprises the following steps:

impregnating a continuous fiber body with a polyamide resin melt to obtain a fiber impregnated body, wherein the polyamide resin melt comprises PA resin, an anti-ultraviolet auxiliary agent, an anti-aging auxiliary agent, a toughening agent and a flame retardant;

spirally winding the fiber impregnant in a preheating state on a mandrel, and solidifying and cooling to obtain a continuous fiber reinforced polyamide cylindrical body;

cutting the cylindrical body along the axial direction to obtain a rough blank of the wire clamp main body with a groove;

and machining the screw hole in the rough blank of the wire clamp main body.

Further, for the light tension-resistant wire clamp, the pressing block is provided with a groove, and the groove in the pressing block is matched with the groove in the wire clamp main body to clamp the wire.

Furthermore, for the light strain clamp, the pressing block is made of a polyamide resin block, and the pressing block made of a thermoplastic resin material is adopted to reduce damage to the wire.

Further, for the lightweight strain clamp, the reinforcing fiber body is a glass fiber bundle.

Further, with the aforementioned lightweight strain clamp, in which the continuous fiber heated at the time of impregnation is introduced into a mold and brought into contact with the polyamide resin melt, a prepreg is obtained.

Furthermore, for the light strain clamp, the preheating temperature is 200-300 ℃, the winding tension is 50-100N, and the winding speed is 15-20m/min.

Further, for the light strain clamp, the polyamide resin comprises 40-60% of PA resin, 2-4% of ultraviolet resistance auxiliary agent, 0.3-0.6% of anti-aging auxiliary agent, 2-5% of toughening agent and 25-30% of flame retardant, wherein the toughening agent is POE-g-MAH, the ultraviolet resistance auxiliary agent is carbon black, the anti-aging auxiliary agent is pentaerythritol ester, and the flame retardant is brominated polystyrene.

Further, with the lightweight strain clamp described above, the reinforcing fiber body is a continuous strip having a warp direction and a weft direction.

Technical effects

1. The main body of the strain clamp uses PA resin, belongs to non-metallic non-magnetic conducting materials, and therefore, the strain clamp has the advantages of no electric energy loss, high mechanical strength, ageing resistance, ultraviolet resistance, light weight, and reduced cost and energy consumption.

2. The strain clamp adopts a continuous fiber reinforcement process, has a higher mechanical reinforcement effect compared with a short fiber material, improves the circumferential tension of a clamp main body by adopting winding forming, and prolongs the service life.

3. According to the winding forming manufacturing process of the wire clamp main body, two wire clamp main bodies are formed at one time through axis cutting, the production efficiency is improved, and the cost is reduced.

4. According to the invention, the pressing block made of the thermoplastic resin is used for reducing the damage to the wire, and the thermoplastic PA resin can improve the adhesion force with the U-shaped screw and improve the locking effect.

Drawings

FIG. 1 is a schematic view of the structure of a lightweight strain clamp of the present invention

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

A light strain clamp comprises a clamp main body 1, a pressing block 2, a U-shaped screw 3, a gasket and a nut 4, wherein the clamp main body 1 is provided with a groove for a wire to pass through along the axial direction, the pressing block 2 is arranged in the groove, and the U-shaped screw 3 passes through a screw hole of the clamp main body 1 and is fixed by the gasket and the nut 4;

the wire clamp main body 1 is prepared from continuous fiber reinforced polyamide resin,

the preparation process comprises the following steps:

spirally winding the fiber impregnation body in a preheating state on a mandrel, and solidifying and cooling to obtain a continuous fiber reinforced polyamide cylindrical body;

machining the screw hole in the rough blank of the wire clamp main body;

the pressing block 2 is provided with a groove, and the groove on the pressing block 2 is matched with the groove of the wire clamp main body 1 to clamp a wire;

the briquetting 2 is made of polyamide resin, and the resin briquetting is used for effectively reducing damage to the wire.

The reinforced fiber body is a glass fiber bundle;

for the aforementioned lightweight strain clamp, in which the heated continuous fibers are introduced into a mold during impregnation, and contacted with the polyamide resin melt to obtain a prepreg;

wherein the preheating temperature is 200-300 ℃, the winding tension is 50-100N, and the winding speed is 15-20m/min;

the polyamide resin comprises 40-60% of PA resin, 2-4% of ultraviolet resistance auxiliary agent, 0.3-0.6% of ageing resistance auxiliary agent, 2-5% of toughening agent, 25-30% of flame retardant, POE-g-MAH, carbon black as the ultraviolet resistance auxiliary agent, pentaerythritol ester as the ageing resistance auxiliary agent and brominated polystyrene as the flame retardant agent.

Further, for the light tension-resistant cable clamp, the reinforcing fiber body adopts a continuous strip material with a radial direction and a weft direction, and the continuous strip material increases the radial tension of the cable clamp body on one hand, and also increases the axial tension of the cable clamp body on the other hand, so that the mechanical strength and the durability of the cable clamp are improved.

The strain clamp main body is made of PA resin, belongs to a non-metallic non-magnetic-conductive material, and therefore has the advantages of no electric energy loss, high mechanical strength, ageing resistance, ultraviolet resistance, light weight, and reduced cost and energy consumption.

Above-mentioned strain clamp adopts continuous fibers reinforcing process, compares short-staple material mechanical reinforcement effect higher, adopts winding forming to improve fastener main part hoop tension, has improved life.

According to the winding forming manufacturing process of the wire clamp main body, two wire clamp main bodies are formed at one time through axis cutting, the production efficiency is improved, and the cost is reduced.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent replacement or change of the technical solution and the inventive concept thereof within the technical scope of the present invention.

Claims

1. The utility model provides a light strain clamp, includes fastener main part, briquetting, U-shaped screw, packing ring, nut, its characterized in that: the wire clamp main body is provided with a groove for a wire to pass through along the axial direction, a pressing block is arranged in the groove, and the U-shaped screw passes through a screw hole of the wire clamp main body and is fixed by a gasket and a nut;

the preparation process comprises the following steps:

impregnating a polyamide resin melt with a continuous fiber body to obtain a fiber impregnated body, wherein the polyamide resin melt comprises PA resin, an anti-ultraviolet auxiliary agent, an anti-aging auxiliary agent, a toughening agent and a flame retardant, the heated continuous fiber is introduced into a mould during impregnation and is contacted with the polyamide resin melt to obtain the prepreg, the preheating temperature is 200-300 ℃, the winding tension is 50-100N, the winding speed is 15-20m/min, the polyamide resin comprises 40-60% of the PA resin, 2-4% of the anti-ultraviolet auxiliary agent, 0.3-0.6% of the anti-aging auxiliary agent, 2-5% of the toughening agent, 25-30% of the flame retardant agent, POE-g-MAH, the anti-ultraviolet auxiliary agent is carbon black, the anti-aging auxiliary agent is pentaerythritol ester, the flame retardant agent is brominated polystyrene, and the reinforced fiber body adopts a continuous strip with a radial direction and a latitudinal direction;

and machining the screw hole in the rough blank of the wire clamp main body.

2. The strain clamp of claim 1, wherein the press block is provided with a groove, the groove on the press block cooperating with the groove on the clamp body to clamp the wire.

3. The strain clamp of claim 1, wherein the compact is a polyamide resin compact.

4. The strain clamp of claim 1, wherein the reinforcing fiber body is a glass fiber bundle.