CN203983911U - A kind of anti-icing destruction strain clamp - Google Patents

Abstract

The utility model provides a kind of anti-icing destruction strain clamp, this wire clamp comprises aluminum pipe, steel anchor and sealing bolt, described steel anchor is connected and composed successively by conductor compression jointing portion, aluminum pipe pressure contact portion and draw ring, described conductor compression jointing portion, aluminum pipe pressure contact portion all stretch in described aluminum pipe, described aluminum pipe pressure contact portion and aluminum pipe crimping, on the just right aluminum pipe outer wall of described conductor compression jointing portion or aluminum pipe pressure contact portion, offer greasing hole, described sealing bolt is connected with greasing hole.The utility model offers greasing hole on aluminum pipe, conductive grease can be injected to aluminum pipe internal cavities, after greasing, seal with aluminum bolt, make like this in the time that strain insulator line string hangs upside down, owing to having filled conductive grease in strain clamp cavity, rainwater does not have local storage in strain clamp inside, thereby prevents strain clamp aluminum pipe because of water freezing expansion damage strain clamp in operation engineering.

Description

A kind of anti-icing destruction strain clamp

Technical field

The utility model relates to high-tension line gold utensil field, especially relates to a kind of anti-icing destruction strain clamp.

Background technology

Strain clamp is for fixing cord, to bear wire tension, and wire is hung to the gold utensil on strain insulator-string group or shaft tower.Strain clamp is divided into by structure: three kinds of bolt-type strain clamps, compression type strain clamp, wedge shape strain clamp.Wherein, compression type strain clamp is that wire is fixed on to the gold utensil on strain insulator string, and its structure has been all national standard, and tradesman makes product according to this standard.The compression type strain clamp of making according to industry standard, as patent ZL201320216928.4, shown in patent ZL201110172850.6 etc., it is by aluminum pipe, steel anchor, drainage plate and conduction wire clamp composition, one end of aluminum pipe and conductor compression jointing, the other end and the crimping of steel anchor, steel anchor and wire are in aluminum pipe inside also crimping, and drainage plate one end is provided with a collar, drainage plate is socketed on aluminum pipe by this collar, and conduction wire clamp one end is connected with drainage plate with wire jumper crimping, the other end.

But, above-mentioned compression type strain clamp is in the time that reality is used, especially in the time that compression-type strain insulator line string hangs upside down, rainwater easily enters the aluminum pipe inside of compression type strain clamp, and pile up and store in inside, after the water for cooling storing freezes, compression type strain clamp can destroy aluminum pipe because water expands, and forms the accident phenomenon of " bulge ".

Utility model content

The purpose of this utility model is: the problem existing for prior art, a kind of anti-icing destruction strain clamp is provided, and solve conventional compression type strain clamp and can destroy aluminum pipe because water expands, cause the problem of " bulge ".

The purpose of this utility model is achieved through the following technical solutions:

A kind of anti-icing destruction strain clamp, it is characterized in that, this wire clamp comprises aluminum pipe, steel anchor and sealing bolt, described steel anchor is connected and composed successively by conductor compression jointing portion, aluminum pipe pressure contact portion and draw ring, described conductor compression jointing portion, aluminum pipe pressure contact portion all stretch in described aluminum pipe, described aluminum pipe pressure contact portion and aluminum pipe crimping, offer greasing hole on the just right aluminum pipe outer wall of described conductor compression jointing portion or aluminum pipe pressure contact portion, and described sealing bolt is connected with greasing hole.

Preferably, the outer surface of described aluminum pipe pressure contact portion is provided with multi-turn groove.

Preferably, described greasing hole is opened on the just right aluminum pipe wall of described groove.

Preferably, described sealing bolt is metal bolts.

Preferably, described sealing bolt is aluminum bolt.

Preferably, be conductive grease from the fat of injection aluminum pipe inside, greasing hole.

Preferably, this wire clamp also comprises drainage plate and conduction wire clamp, and described drainage plate is sheet veneer, and described conduction wire clamp and drainage plate are superimposed together, and fixes by 4 bolts.

Preferably, described drainage plate thickness is 20mm.

Compared with prior art, the utlity model has following advantage:

1, on aluminum pipe, offer greasing hole, conductive grease can be injected to aluminum pipe internal cavities, after greasing, seal with aluminum bolt, make like this in the time that strain insulator line string hangs upside down, owing to having filled conductive grease in strain clamp cavity, rainwater does not have local storage in strain clamp inside, thereby prevents strain clamp aluminum pipe because of water freezing expansion damage strain clamp in operation engineering;

2, be provided with multi-turn groove at aluminum pipe pressure contact portion, in the time of aluminum pipe pressure contact portion and aluminum pipe crimping, can increase crimp force between the two;

3, greasing hole be opened in aluminum pipe pressure contact portion groove on just right aluminum pipe wall, while being convenient to greasing, can ensure that conductive grease as much as possible is infused in the cavity between aluminum pipe and aluminum pipe pressure contact portion, because this cavity is nearest from port, thereby can at utmost avoid rainwater to enter aluminum pipe inside, cause " bulge ";

4, sealing bolt adopts aluminum bolt, can ensure the unobstructed of conduction, can avoid again corrosion;

5, drainage plate is taked the reinforced pattern of veneer, drainage plate is in increasing contact area, adopt 4 M16 bolts to ensure having good electrical contact between conduction wire clamp and drainage plate, drainage plate veneer thickness is increased to 20mm simultaneously, to ensure that drainage plate has enough intensity.

Brief description of the drawings

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

Fig. 2 is the structural representation of steel anchor;

Fig. 3 is the structural representation of sealing bolt;

Fig. 4 is the syndeton schematic diagram of drainage plate and conduction wire clamp.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.

Embodiment

As shown in Figure 1 to 4, a kind of anti-icing destruction strain clamp of the utility model is mainly made up of aluminum pipe 1, steel anchor 2, drainage plate 4, conduction wire clamp 5 and sealing bolt 3.Wherein, steel anchor 2 is connected and composed successively by conductor compression jointing portion 21, aluminum pipe pressure contact portion 22 and draw ring 23.Aluminum pipe 1 is for being connected with the aluminium stranded conductor part of steel reinforced aluminium conductor, and steel anchor 2, for being connected with the steel core part of steel reinforced aluminium conductor, both by produce plastic deformation under pressure, thereby is combined into entirety with aluminium stranded conductor and steel core respectively.When use, the conductor compression jointing portion 21 of steel anchor 2, aluminum pipe pressure contact portion 22 are stretched in aluminum pipe 1, first that conductor compression jointing portion 21 is good with the steel core part crimping of steel reinforced aluminium conductor, then, by good to aluminum pipe pressure contact portion 22 and aluminum pipe 1 crimping, steel reinforced aluminium conductor, aluminum pipe 1, steel anchor 2 have just formed an entirety like this.On aluminum pipe 1 outer wall, offer greasing hole 11, when connecting after wire, by this greasing hole 11 to the interior injection conductive grease of aluminum pipe 1, thereby the cavity of aluminum pipe inside is all filled up, finally with sealing bolt 3, greasing hole 11 is sealed up, make like this in the time that strain insulator line string hangs upside down, owing to having filled conductive grease in strain clamp cavity, rainwater does not have local storage in strain clamp inside, thereby prevents strain clamp aluminum pipe because of water freezing expansion damage strain clamp in operation engineering.Wherein greasing hole 11 can be opened on conductor compression jointing portion 21 or 22 just right aluminum pipe walls of aluminum pipe pressure contact portion, as long as can be communicated with the cavity that inside forms.

In order to increase crimp force, the outer surface of aluminum pipe pressure contact portion 22 is provided with multi-turn groove 221, in the time of aluminum pipe pressure contact portion and aluminum pipe crimping, thereby can increase crimp force between the two, makes both connections more firm.

In order to make waterproof effect better, greasing hole 11 is opened on 221 just right aluminum pipe walls of groove of aluminum pipe pressure contact portion 22.Like this, because ensureing conductive grease, the existence of groove injects smoothly aluminum pipe inside, simultaneously, in the time of greasing, can also ensure that conductive grease as much as possible is infused in the cavity between aluminum pipe and aluminum pipe pressure contact portion, because this cavity is nearest from port, thereby can at utmost avoid rainwater to enter aluminum pipe inside, cause " bulge ".

Sealing bolt 3 can adopt metal bolts.This bolt length is shorter, just to seal greasing hole for well.The sealing bolt 3 of the present embodiment adopts aluminum bolt, and it can ensure the unobstructed of conduction, can avoid again corrosion.

Drainage plate 4 is the reinforced pattern of sheet veneer, and its one end is provided with a collar, and drainage plate is socketed on aluminum pipe 1 by this collar.Conduction wire clamp 5 is also laminated structure, and its one end and wire jumper crimping, the other end and drainage plate 4 are superimposed together, and fixing by 4 M16 bolts 6.Adopt fixing can the guarantee of 4 M16 bolts to have good electrical contact between conduction wire clamp and drainage plate, drainage plate veneer thickness is increased to 20mm simultaneously, to ensure that drainage plate has enough intensity.

Be below selection and the technique of the each building block of the utility model:

Selection: steel anchor material of the present utility model is by the regulation of GB/T700, and the trade mark is Q235A level, yield strength 235MPa, finished product hardness is not more than HB156.Steel anchor adopts integrate forging process processing, and the non-finished surface steel seal degree of depth is not more than 1mm, and width is not more than 3mm, has not allowed crackle, delamination and oxide skin to exist.Steel anchor adopts hot galvanizing anticorrosion, after steel pipe is also zinc-plated, should return remaining zinc.Aluminum pipe is selected hot-extrusion aluminum tube, and aluminum pipe intensity is not less than 80MPa, and elongation is not less than 20%.Drainage plate material selection aluminium purity is not less than 99.5% hot extruded shapes.

Technique:

1, steel anchor

(1) pipe diameter of steel anchor conductor compression jointing portion

Internal diameter is considered the detector for outer diameter error of zinc-coated wire, comprehensively shells steel core external diameter after aluminium thigh and changes and facilitate the composite factor such as poling, compression ratio to consider that pipe diameter Ф design value is 9.1mm.

(2) outer diameter of steel pipes of steel anchor conductor compression jointing portion

After the compacting of steel anchor conductor compression jointing portion, mid portion can be thought and is equal to steel core area, outer diameter of steel pipes D ₂designing requirement be the steel core intensity that the intensity of the steel pipe after crimping is more than or equal to steel reinforced aluminium conductor, that is:

F steel anchor=F steel core

Parameter is brought into and calculated rear value: D ₂=17.234mm

That is: outer diameter of steel pipes is greater than 17.234 steel strengths and meets the demands.D ₂design value is 18mm.

(3) the steel pipe compression ratio of steel anchor conductor compression jointing portion checks

Compression ratio (K) is the important symbol of pressure, and compression ratio is little means that pressure does not reach requirement and even there is no pressure; But compression ratio is excessive can cause again the overlap after crimping excessive, waste of material, even affects compacting.

$K=\frac{S_1-S_2}{S_1}\×100\%$

Wherein:

S ₁---steel pipe presses starting section long-pending

S ₂---steel pipe is pressed rear sectional area

$S_1=\frac{\mathrm{\π}}{4}{D_2}^2-\frac{\mathrm{\π}}{4}{{\mathrm{\Φ}}_1}^2=189.43$

$S_1=\frac{\mathrm{\π}}{4}{D_2}^2\×k_1-S_1=168.109$

$K=\frac{S_1-S_2}{S_1}\×100\%=11.3\%$

Approach with the common value 12% of China compression ratio, this compression ratio value is reasonable.

(4) steel anchor and steel core crimping length

The pulling force of steel reinforced aluminium conductor steel core is to be held with a firm grip by the steel pipe of steel anchor conductor compression jointing portion, ensure the enough intensity of holding, and needs the crimping length that keeps certain.An empirical coefficient of the general employing of calculating of crimping length, for 7 strands of steel cores, crimping length approximates 13.5 times of steel strand wire external diameter.This design is taken as 120mm.

2, aluminum pipe

(1) aluminum pipe internal diameter

Aluminum pipe internal diameter is considered the error of the aluminium lamination aluminium monofilament of steel reinforced aluminium conductor, and internal diameter design value is 31.5mm.

(2) aluminum pipe external diameter

The designing requirement of aluminum pipe external diameter is that the intensity of aluminum pipe meets: the requirement of the pull-off force sum of the aluminium stranded conductor of the pull-off force >=steel reinforced aluminium conductor after aluminum pipe crimping.

Wherein:

σ ₂---aluminum pipe intensity

D ₁---aluminum pipe external diameter (mm)

S---the steel reinforced aluminium conductor gross area

σ _n---aluminium stranded conductor intensity

S _aluminium---aluminium stranded conductor sectional area

Strain clamp aluminum pipe external diameter comprehensive compression ratio and design margin, D1 design value is 52mm herein.

(3) aluminium aluminium hydraulic pressed connecting pipe crimping length

Aluminium aluminium hydraulic pressed connecting pipe crimping length is about 7 times of steel reinforced aluminium conductor external diameter according to empirical equation crimping length.Be 7X30+52 (pulling out slightly length)=262, round as L1=260mm.

3, strain clamp electric conductivity

Because the conductive capability of steel core is compared and can be ignored with aluminium stranded conductor, we think that steel reinforced aluminium conductor electric current is mainly transmitted as aluminium stranded conductor.The current delivery wire of same strain clamp also can be similar to and think aluminum pipe.Strain clamp part current delivery ability after the pressure contact portion of aluminum pipe and aluminium stranded conductor divides all depends on aluminum pipe, and this just need to ensure that the smallest cross-section area of aluminum pipe can not be less than the sectional area of the aluminium stranded conductor part of steel reinforced aluminium conductor.The smallest cross-section area of aluminum pipe is positioned at and steel pipe crimp segment, and its cross-sectional area is:

$S_3=\frac{\mathrm{\π}}{4}{D_1}^2{K}_1-\frac{\mathrm{\π}}{4}{D_3}^2=1146.93$

Obviously, S ₃be greater than steel reinforced aluminium conductor aluminium stranded conductor partial cross section and amass 500, electric conductivity satisfies condition.

4, steel anchor draw ring

The intensity of steel anchor draw ring should be not less than the calculating pull-off force of steel reinforced aluminium conductor, and when the designing requirement of external diameter is steel anchor draw ring elongation 1% (surrender), intensity equals steel reinforced aluminium conductor, and for ease of producing, T value is got the calculating pull-off force of larger steel-core-aluminium strand:

${\mathrm{\σ}}_1\×2\×\frac{\mathrm{\π}\×{D_4}^2}{4}=T$

σ 1---tube material yield strength (235MPa)

D ₄---steel anchor draw ring external diameter (mm)

The calculating pull-off force (128.1kN) of T---steel reinforced aluminium conductor

Bring calculation of parameter into and obtain D ₄=18.628mm, value is D ₄=20mm.

The radius of draw ring annular is taken as 13mm, and the straight line portion length of annular is taken as 52mm.Draw ring Leading end chamfer 2X45 °, plays the effect that navigates to aluminum pipe, and ensures to contact closely with aluminum pipe section after compacting, prevents that rainwater from entering aluminum pipe.

5, the pattern of strain clamp drainage plate and processing request:

Drainage plate will meet the requirement of strain clamp electric conductivity, therefore will determine that the thickness of drainage plate and width are to determine the sectional area of drainage plate, and sectional area size can not be less than the sectional area of steel reinforced aluminium conductor aluminum portions.Conduction wire clamp often occurs in domestic conduction wire clamp in the past to be contacted bad or contact-making surface is too little and cause that high temperature even burns red phenomenon by drainage plate and conduction wire clamp with drainage plate.This takes the reinforced pattern of veneer to strain clamp drainage plate, drainage plate adopts 4 M16 bolts to ensure between conduction wire clamp and drainage plate according to there being good electrical contact in increasing contact area, drainage plate veneer thickness is increased to 20mm simultaneously, to ensure that drainage plate has enough intensity.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; it should be pointed out that all any amendments of doing within spirit of the present utility model and principle, be equal to replacement and improvement etc., within all should being included in protection range of the present utility model.

Claims (8)

1. an anti-icing destruction strain clamp, it is characterized in that, this wire clamp comprises aluminum pipe, steel anchor and sealing bolt, described steel anchor is connected and composed successively by conductor compression jointing portion, aluminum pipe pressure contact portion and draw ring, described conductor compression jointing portion, aluminum pipe pressure contact portion all stretch in described aluminum pipe, described aluminum pipe pressure contact portion and aluminum pipe crimping, offer greasing hole on the just right aluminum pipe outer wall of described conductor compression jointing portion or aluminum pipe pressure contact portion, and described sealing bolt is connected with greasing hole.

2. the anti-icing destruction strain clamp of one according to claim 1, is characterized in that, the outer surface of described aluminum pipe pressure contact portion is provided with multi-turn groove.

3. the anti-icing destruction strain clamp of one according to claim 2, is characterized in that, described greasing hole is opened on the just right aluminum pipe wall of described groove.

4. the anti-icing destruction strain clamp of one according to claim 1, is characterized in that, described sealing bolt is metal bolts.

5. the anti-icing destruction strain clamp of one according to claim 4, is characterized in that, described sealing bolt is aluminum bolt.

6. the anti-icing destruction strain clamp of one according to claim 1, is characterized in that, the fat that injects aluminum pipe inside from greasing hole is conductive grease.

7. the anti-icing destruction strain clamp of one according to claim 1, is characterized in that, this wire clamp also comprises drainage plate and conduction wire clamp, and described drainage plate is sheet veneer, and described conduction wire clamp and drainage plate are superimposed together, and fixes by 4 bolts.

8. the anti-icing destruction strain clamp of one according to claim 7, is characterized in that, described drainage plate thickness is 20mm.