CN1019536B

CN1019536B - Low-pressure overhead circuit cross arm of glass fiber reinforced plastics

Info

Publication number: CN1019536B
Application number: CN 88107801
Authority: CN
Inventors: 尤大千; 蒋礼堂; 吴淦清
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-11-15
Filing date: 1988-11-15
Publication date: 1992-12-16
Also published as: CN1042810A

Abstract

The present invention relates to a cross arm of a low voltage glass fiber reinforced plastic erecting circuit, which belongs to a low voltage distribution device. The cross arm is designed into a linear type and an expansion resistant type, wherein the linear type cross arm is composed of a line clamping guard sheet, an I-shaped or rectangular cross arm, an M-shaped holding iron, a U-shaped holding hook, screws and nuts; except for the components, the expansion resistant type cross arm is also provided with a draw rod with a fixing plate, a draw rod sleeve and an enhancing part. The two cross arms have the advantages of convenient manufacture, light weight, convenient transportation and installation, long service life, good insulating property, etc.

Description

Low-pressure overhead circuit cross arm of glass fiber reinforced plastics

The present invention relates to low-voltage distribution equipment, relate in particular to low-voltage overhead line road cross-arm.

At present, cross-arm commonly used has two kinds of wooden cross arm and iron cross arms on low-voltage circuit.Wooden cross arm is molecular by the insulation of a wooden bearing bar and an insulating effect, and bearing bar relies on bolt, nut and diagonal brace ferropexy on electric pole.Its major defect is to be subject to damage by worms and corrode, and useful life is shorter, is eliminated substantially in today of wood supply growing tension.Iron cross arm is to be bearing bar with section bars such as angle steel or channel-section steels, and embraces the securing member that iron forms with U-shaped anchor ear and M shape its and electric pole are fixed together, and installs on the bearing bar that insulator is used for installing electric wiring and an insulating effect again.This iron cross arm has higher load intensity, and useful life is also longer, is generally adopted.But that its most fatal shortcoming is a weight is big, transportation and difficulty is installed, and in carrying the very easy insulator that breaks.The structure of above-mentioned two kinds of cross-arms all be with bearing bar as stressed member, insulator assembles between the two as insulating element.

The ceramic cross-arm of increasingly extensive use in recent years has good insulation and chemical stability, the phenomenon of not damaging by worms, but its major defect has 2 points: the one, cost an arm and a leg, and be used on the high-tension overhead line so be only limited to.The 2nd, because its structure of ceramic cross-arm is limit, a cross-arm can only set up an electric wire; And the ceramic cross-arm of strain insulator formula load bar must be used with metal cross arm, only can be installed in the metal cross arm both sides, and can not become independently cross-arm as being subjected to sliding insulator, and, be irrational as used by draw piece because the tensile strength of ceramic material is lower.

The objective of the invention is to overcome the deficiency of aforementioned three kinds of technology, and provide a kind of good insulation preformance, in light weight, the mechanical strength height, long service life, be easy to transportation and installation, load and two kinds of functions of insulation realized at a global facility simultaneously, and can on a cross-arm, set up the fiberglass low-voltage overhead line road cross-arm of 2-6 electric wire simultaneously.

The objective of the invention is to realize according to following design.

The present invention includes the design of orthoscopic and two kinds of cross-arms of strain insulator formula.

One. orthoscopic low pressure overhead circuit cross arm

The securing member of embracing iron and U-shaped anchor ear composition by M shape is fixed on bearing bar on the electric pole.Bearing bar adopts fiberglass to make.Bearing bar is connected as a single entity the insulator of the 2-6 line of the formula that forms a whole with 2-6 the stringing slotware which is provided with.

But stringing slotware integral die-cast also can be made up of some card line washers, and wherein per two card line washers constitute one group of stringing slotware side by side, and is fixed on the bearing bar and becomes one with it.Fixing mode can adopt adhering method, also can adopt the method that is compressed to one.

Two. strain insulator formula low-voltage overhead line road cross-arm.

The securing member of embracing iron and U-shaped anchor ear composition by M shape is fixed on bearing bar on the electric pole.Bearing bar adopts glass-reinforced plastic material to make.Bearing bar is connected as a single entity the insulator of the 2-6 line of the formula that forms a whole with 2-6 the stringing slotware which is provided with.When this cross-arm bears bigger tension force, be designed to adjustable English truss structure.

Adjustable English truss is made up of arm-tie, pull bar and the drag link sleeve of bearing bar, U-shaped anchor ear, angle adjustable, wherein arm-tie is welded on the outside, U-shaped anchor ear top as securing member, the arm-tie two ends are the welding rod cover respectively, pull bar one end band screw thread, flexibly connect with nut and drag link sleeve, the other end is connected with the bearing bar end.

When pull bar and bearing bar are fastening, for the screw of exempting fiberglass bearing bar end bears extrusion stress and the shearing that the pull bar screw causes, the spy respectively inserts a metal drawer formula plug that matches with the support bar wall in two ends of bearing bar, by the screw fixed form bearing bar, drawer type plug and pull bar is fixed together.Between drawer type plug and the support bar end, can add a sticking insulating trip to increase climbing arc distance.

Stringing slotware in the cross-arm of strain insulator formula low-voltage overhead line road can be made up of pad wire loop, pad line slip ring and card line shelves ring, wherein fills up the line slip ring sleeve outside the pad wire loop, and for being slidingly matched, card line shelves ring then is positioned at pad wire loop both sides between the two.

Above-mentioned two kinds of cross-arms all can be divided into two wires, four lines, three kinds of standards of six lines, to satisfy the multiple needs of low-voltage circuit.

Advantage of the present invention can be summarized as follows:

1. be one with fiberglass bearing bar and stringing slotware group, stressed and insulation function is realized in a cross-arm simultaneously.Saved insulator.

2. owing to adopt glass-reinforced plastic material to make, so in light weight, low price, saving steel or timber.

3. be convenient to make, transport, install, can save installation work-hour greatly, and spoilage is extremely low.

4. long service life.

5. electrical insulation capability is good.

Embodiment and description of drawings:

Fig. 1 is the assembling schematic diagram of embodiment 1.

Fig. 2 is the assembly drawing of embodiment 1.

Fig. 3 is the assembling schematic diagram of embodiment 2.

Fig. 4 is the assembly drawing of embodiment 2.

Wherein: 1-card line washer, the 2-bearing bar, 3-M shape is embraced iron, 4-electric pole, 5-U shape anchor ear, the 6-elastomeric pad, the 7-nut, the 8-electric wire, the 9-insulating trip, mother falls in 10-, 11-stringing slotware, 12-drag link sleeve, 13-drawer type plug, 14-pull bar, 15-pull bar fixed head, 16-adjusting nut, 17-screw, 18-nut, the 19-elastic washer, 20-nut, 21-pad wire loop, 22-card line shelves ring, 23-pad line slip ring, 24-arm-tie, 25-iron cross arm, 26-pottery cross-arm.

As shown in the figure, embodiment 1 is a kind of version of orthoscopic fiberglass cross-arm.It has two transversely arranged flat through holes at the middle part of fiberglass bearing bar 1, M shape embrace iron 3 be two ends have with cross-arm on the flat pitch-row from cooperating consistent rectangular flat with size, two bar shaped Ka Jiao that lay respectively at inboard, flat hole are arranged on a plane of plate, contact in order to cylinder with electric pole 4; U-shaped anchor ear 5 has an arc-shaped curved surface that curves with bar-shaped plate, the both ends of curved surface respectively have one with the consistent pillar-bolt of U-shaped anchor ear 5 opening directions, M shape is embraced iron 3 in whole orthoscopic cross-arm is embraced iron 3 and bearing bar 2 midfields by M shape two flat holes and bearing bar 2 is through on two bolts of U-shaped anchor ear, fastening and be fixed on U-shaped anchor ear and M shape are embraced electric pole 4 between the iron with being screwed in nut 7 on the bolt.

Embodiment 2 is a kind of version of strain insulator formula fiberglass cross-arm.For bearing the variation of bigger wire tension and adaptation pole diameter, be designed to adjustable English truss structure.The structure of its fiberglass bearing bar 1 is a hollow tubular, has two horizontal oblate through holes on the abdomen of middle part, and two ends respectively have a through hole.The drawer type plug is made with metal, and it is by constituting with hollow bearing bar cavity shape kissing and drawer type insert that is slidingly matched with it and the drawer face that is equal to or greater than the cross-arm cross section, and insert and drawer face are connected as a single entity.Have on its insert 1 with the corresponding through hole of cross-arm termination perforate, bearing bar 2 is connected with the drawer type plug 13 usefulness adhesives that insert its end, with the mechanical strength of increase bearing bar and disperse the rod member port and the suffered stress of through-hole section; The drag link sleeve 12 of welding is the short metal tube that two internal diameters are a bit larger tham the pull bar external diameter on the arm-tie 24 of U-shaped anchor ear 5, two sleeve pipes 12 divide on the arm-tie 24 that is welded in the U-shaped anchor ear 5 arc-shaped curved surfaces outside symmetrically, the plane that two sleeve pipe center lines constitute and the plane of U-shaped anchor ear two bolts coincide, pull bar and cross-arm centreline space angle α are advisable (wherein to approximate 2arctg2d/b, d is a pole diameter, and b is a cross-arm length); Described pull bar 14 is Metallic rod, on the one end pin thread is arranged, and the other end is welded with a pull bar fixed head, has 1 and the corresponding to circular hole of cross-arm termination through hole on it; The M shape that M shape is embraced in iron and the orthoscopic cross-arm is embraced iron phase together.Two bolts of U-shaped anchor ear 5 pass M shape respectively and embrace through hole in iron 3 and the bearing bar 2, and with nut 20 that bearing bar and electric pole 4 is fastening, add an elastic washer 19 between nut and the bearing bar.For strengthening the mechanical strength of strain insulator formula cross-arm, cross-arm is designed to an adjustable English truss, it is as follows that it forms structure: at first fix a rubber-like arm-tie 24 in the outside of U-shaped anchor ear 5, the two ends of arm-tie 24 are welded with drag link sleeve 12 respectively, one end of drag link sleeve 14 has pin thread and inserts in the drag link sleeve and fix with adjusting nut 16, and comes adjustment of tonicity by adjusting nut.For ensure pull-rod nut not reason shaken and become flexible, also can add and fall mother 10.The pull bar other end is the pull bar fixed head 15 of a metal, perforate on the pull bar fixed head, and screw 17 passes the drawer type plug 13 and the through hole on the pull bar fixed head 15 and fixing with nut 18 of bearing bar 2, bearing bar respectively.

Pad wire loop 21 in the present embodiment is with rotary way socket not and be fixed on the support bar 2, and it is outer and become turn cooperation with it that pad line slip ring then is enclosed within the pad wire loop, so that the stringing operation during the installation electric wire carries out and reduce the wearing and tearing of electric wire epidermis smoothly.

Above-mentioned two types cross-arm all can be divided into two wires, four lines, three kinds of standards of six lines, and the cross-arm length ratio of three kinds of standards is about 3.21/7.2/11.2.Correspondingly, the stringing slotware also is provided with 2-6 as required, and frame is fixed between two card line washers 1 and with reinforcing wire at the electrical wire fastener on the orthoscopic cross-arm; Strain insulator formula cross-arm then can be used as the electric wire terminal, and each group electric wire is erected at respectively on the pad line slip ring 23 and with reinforcing wire from both direction and fixes.

Can find out by the foregoing description, present invention can be implemented in the function of setting up many wires on the insulating part.And, make bearing bar and the stringing slotware on it have realized being the dual-use function that load insulate again because the bearing bar that glass fiber reinforced plastic shapes is done has good insulation property.Through preliminary experiment, proving effect is good.

Claims

1, a kind of orthoscopic low-voltage overhead line road cross-arm is close to firmware bearing bar is fixed on the electric pole, and it is characterized in that: bearing bar is made of glass-reinforced plastic material; The form a whole 2-6 line insulator of formula of bearing bar and the 2-6 on it stringing slotware.

2, orthoscopic low-voltage overhead line according to claim 1 road cross-arm is characterized in that the stringing slotware is made up of card line washer, and wherein per two card line washers one group of stringing slotware of formation and being fixed on the bearing bar side by side become one with it.

3, a kind of strain insulator formula low-voltage overhead line road cross-arm is close to firmware bearing bar is fixed on the electric pole, and it is characterized in that: bearing bar is made of glass material; The form a whole 2-6 line insulator of formula of bearing bar and the 2-6 on it stringing slotware; Wherein four lines and six pin crossarm are an adjustable English truss structure.

4, according to the described strain insulator formula of claim 3 low-voltage overhead line road cross-arm, it is characterized in that adjustable English truss is by bearing bar, U-shaped anchor ear, is used to adjust the arm-tie of angle, pull bar and drag link sleeve are formed, wherein arm-tie is welded in the U-shaped anchor ear outside of securing member, arm-tie two ends welding rod cover, pull bar one end respectively flexibly connect with nut and drag link sleeve, and the other end is connected with the bearing bar end.

5, according to claim 3 or 4 described strain insulator formula low-voltage overhead line road cross-arms, it is characterized in that: a metal drawer formula plug that matches with the support bar wall is respectively inserted in two ends of support bar, by the screw fixed form bearing bar, drawer type plug and pull bar is fixed together.

6, according to claim 3 or 4 described strain insulator formula low-voltage overhead line road cross-arms, it is characterized in that the stringing slotware is by filling up wire loop, pad line slip ring and blocking line shelves ring and form, wherein fill up the line slip ring sleeve outside the pad wire loop, for being slidingly matched, card line shelves ring is positioned at pad wire loop both sides between the two.