CN218541749U - Compound cross arm and power transmission pole - Google Patents

Abstract

The application discloses a composite cross arm which is fixedly connected to a rod body of a power transmission pole and comprises a first composite cross arm and a second composite cross arm; one end of the first composite cross arm is fixedly connected with the rod body, the other end of the first composite cross arm is a first free end, and the part of the first composite cross arm, which is far away from the rod body, is used for hanging a lead; the second composite cross arm is hung on the part of the first composite cross arm, which is far away from the rod body, and is used for hanging at least two phases of wires; all the leads are arranged in a double-layer mode at least along the vertical direction. The composite cross arm adopting the structure has good interphase insulation performance and high wire transmission capacity, and can also reduce the width of a line corridor; the upper cross arm is shorter, so that the height of the lightning conductor bracket and the lightning protection distance can be shortened; the whole body is stressed evenly, the force transmission is clear, and the appearance is beautiful. The application also discloses a power transmission pole.

Description

Compound cross arm and power transmission pole

Technical Field

The application relates to the technical field of power transmission, in particular to a composite cross arm and a power transmission pole.

Background

The existing transmission tower generally adopts an insulator to connect the tower and a wire, the insulator and the wire can swing along with the wind when strong wind blows, and the problems of wind deflection, flashover and the like exist, so that the requirement on the space between the wires is high, enough wire electrical clearance circles need to be designed, the problems of complex installation, high tower height and the like exist in the design structure, and meanwhile, certain requirements are provided for the transmission tower installed in a scenic spot area and the attractiveness of the transmission tower.

SUMMERY OF THE UTILITY MODEL

The main purpose of this application is to provide a compound cross arm and transmission of electricity pole to improve the connection stability and the interphase insulation performance of each wire in the transmission tower, can also improve pleasing to the eye degree simultaneously.

In order to solve the technical problem, the technical scheme adopted by the application is as follows: the composite cross arm is fixedly connected to a rod body of a power transmission pole and comprises a first composite cross arm and a second composite cross arm; one end of the first composite cross arm is fixedly connected with the rod body, the other end of the first composite cross arm is a first free end, and the part of the first composite cross arm, which is far away from the rod body, is used for hanging a lead; the second composite cross arm is hung on the part of the first composite cross arm, which is far away from the rod body, and is used for hanging at least two phases of wires; all the wires are arranged in a double layer along the vertical direction at least.

Wherein, first compound cross arm includes at least one first post composite insulator, the one end and the body of rod fixed connection of first post composite insulator, and the other end is first free end.

The first composite cross arm further comprises at least one first cable-stayed composite insulator, one end of the first cable-stayed composite insulator is fixedly connected with the part, far away from the rod body, of the first pillar composite insulator, and the other end of the first cable-stayed composite insulator is fixedly connected with the rod body above the first pillar composite insulator.

The second composite cross arm is of a triangular structure and comprises a second pillar composite insulator and two second cross arm insulators, one ends of the two second cross arm insulators are connected with each other to form the top end of the triangular structure, the other ends of the two second cross arm insulators are connected to the two ends of the second pillar composite insulator respectively to form two second free ends, and the second composite cross arm is fixedly connected with the first free end through the top end.

Wherein the two second free ends are located at the same level.

The composite cross arm further comprises a third cross arm insulator, and two ends of the third cross arm insulator are fixedly connected with the second composite cross arm and the rod body respectively.

Wherein, connect through the triangle yoke plate between two second cross arm insulators, the compound cross arm of second passes through the triangle yoke plate to be connected in first free end.

The second pillar composite insulator and the third cross arm insulator are coaxially and horizontally arranged.

The second composite cross arm comprises four second cross arm insulators and a second pillar composite insulator, the four second cross arm insulators are connected end to form a diamond structure, and two ends of the second pillar composite insulator are fixedly connected with two vertexes of the diamond structure respectively.

The second pillar composite insulator is horizontally arranged, and the second composite cross arm is connected with the first free end through any vertex which is not connected with the second pillar composite insulator in the diamond structure.

The second pillar composite insulator is vertically arranged, and the second composite cross arm is connected with the first free end through any vertex connected with the second pillar composite insulator in the diamond structure.

The composite cross arm further comprises a fourth cross arm insulator, one end of the fourth cross arm insulator is fixedly connected with the rod body, and the other end of the fourth cross arm insulator is fixedly connected with the end point below the diamond structure.

In addition, in order to solve the technical problem, the application also provides a power transmission pole, which comprises a vertically arranged pole body and a plurality of composite cross arms fixedly connected to the pole body.

The beneficial effect of this application is: different from the situation of the prior art, the composite cross arm adopting the structure has good interphase insulation performance and high wire transmission capacity, and can reduce the width of a line corridor; the upper cross arm is shorter, so that the height of the lightning conductor bracket and the lightning protection distance can be shortened; the whole body is stressed evenly, the force transmission is clear, and the appearance is beautiful.

Drawings

In order to more clearly illustrate the technical solutions in the present application, the drawings required in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts. Wherein:

fig. 1 is a schematic structural view of a transmission pole 10 according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a first connection hardware 1120 according to an embodiment of the present disclosure;

FIG. 3 is a schematic view of a rod connector 300 according to an embodiment of the present application;

fig. 4 is a schematic structural view of a transmission pole 10 according to another embodiment of the present application;

fig. 5 is a schematic structural view of a transmission pole 10 according to still another embodiment of the present application;

fig. 6 is a schematic structural view of a transmission pole 10 according to still another embodiment of the present application;

fig. 7 is a schematic structural view of a transmission pole 10 according to still another embodiment of the present application;

fig. 8 is a schematic structural view of a transmission pole 10 according to still another embodiment of the present application;

fig. 9 is a schematic structural view of a transmission pole 10 according to still another embodiment of the present application;

fig. 10 is a schematic structural view of a transmission pole 10 according to still another embodiment of the present application;

fig. 11 is a schematic structural view of a transmission pole 10 according to still another embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In one embodiment, as shown in fig. 1, a composite cross arm 100 is fixedly connected to a pole body 200 of a power transmission pole 10, and the composite cross arm 100 includes a first composite cross arm 110 and a second composite cross arm 120; one end of the first composite cross arm 110 is fixedly connected with the rod body 200, the other end is a first free end, and the part of the first composite cross arm 110 far away from the rod body 200 is used for hanging a conducting wire; the second composite cross arm 120 is hung on the part of the first composite cross arm 110 far away from the rod body 200, and the second composite cross arm 120 is used for hanging at least two phases of conducting wires; all the conducting wires hung on the power transmission pole 10 are at least arranged in a double-layer mode along the vertical direction.

Specifically, the first composite cross arm 110 includes a first composite post insulator 1110, one end of the first composite post insulator 1110 is fixedly connected to the rod 200, and the other end is a first free end, and the first free end is used for hanging a wire. In order to balance the stress of the composite cross arm 100 and to achieve a compact structure, the first pillar composite insulator 1110 is horizontally disposed. Certainly, in other embodiments, the wire can also be hung at any position of the first pillar composite insulator far away from the rod body, and only the requirement of the electrical gap is met; the first post composite insulator may be inclined upward or downward. Preferably, first post composite insulator upwards inclines, can reduce the whole height of the body of rod to practice thrift the cost, and first post composite insulator bears the wire and articulates intensity better.

The first pillar composite insulator 1110 includes an insulator and a shed covering the periphery of the insulator. The insulator may be a solid insulating core or a hollow insulating tube, wherein when the insulator is a solid insulating core, it may be a solid core rod formed by winding glass fiber or aramid fiber impregnated with epoxy resin, or formed by pultrusion, and when the insulator is a hollow insulating tube, it may be a hollow pultruded tube formed by pultrusion of glass fiber or aramid fiber impregnated with epoxy resin, or a glass steel tube formed by winding curing glass fiber impregnated with epoxy resin, or formed by winding curing aramid fiber impregnated with epoxy resin, without limitation. The umbrella skirt can be made of materials such as high-temperature vulcanized silica gel, liquid silicone rubber or room-temperature vulcanized silicone rubber, and the like, without limitation.

The first pillar composite insulator 1110 further includes a connecting fitting, specifically, one end of the insulator is connected with a first connecting fitting 1120 for being fixedly connected with the rod body 200, the other end of the insulator is connected with a second connecting fitting 1130 as a first free end, and a first wire hanging point formed on the first free end is used for hanging a wire.

With reference to fig. 1 and 2, the first connection fitting 1120 includes: a flange tube 1121, a flange 1122, a first attachment plate 1123, and a second attachment plate 1124. The flange tube 1121 is axially arranged to be a hollow structure and sleeved at the end of the insulator; the flange 1122 covers one end of the flange tube 1121, which is away from the insulator, wherein the flange tube 1121 and the flange 1122 may be integrally formed, or may be separately formed and then connected together by welding or the like; the first connection plates 1123 extend from one side of the flange 1122 away from the flange tube 1121 to opposite sides of the flange tube 1121 to be connected to the flange tube 1121, that is, in the axial direction of the first post composite insulator 1110, the first connection plates 1123 extend outward from one side of the flange 1122 away from the flange tube 1121, and in the radial direction of the first post composite insulator 1110, the first connection plates 1123 extend to opposite sides of the flange tube 1121 to be connected to the flange tube 1121; the side edge of the second connecting plate 1124 abuts against the plate surface of the first connecting plate 1123 and extends from the first connecting plate 1123 to the outer circumferential surface of the flange tube 1121, so that an installable space is formed between the first connecting plate 1123 and the second connecting plate 1124, and the installable space can be used for placing a locking member (such as a bolt and the like) for locking the first post composite insulator 1110 and the rod body 200 or other components.

Specifically, the flange plate 1122 is arranged to cover one end, far away from the insulator, of the flange tube 1121, so that corrosion of external water vapor and the like to the insulator can be avoided, the insulator is protected, the service life of the first pillar composite insulator 1110 is prolonged, and meanwhile, the strength of the first connecting hardware 1120 can be improved due to the arrangement of the first connecting plate 1123 and the second connecting plate 1124, and further the strength of the first pillar composite insulator 1110 is improved.

In order to prevent the first connection fitting 1120 from being corroded by moisture, etc., a surface of the first connection fitting 1120 is treated by hot galvanizing, and a material inside the first connection fitting 1120 may be cast aluminum, cast iron, or alloy steel, which is not limited herein.

The first composite cross arm 110 is fixedly connected to the mast 200 by the mast connector 300. Referring to fig. 1 and 3, the rod connector 300 includes an anchor ear 301, a third connecting plate 302 and a fourth connecting plate 303 disposed on the outer circumferential surface of the anchor ear 301. The hoop 301 comprises two half hoops matched with each other, the two half hoops are combined to form a cylindrical inner cavity to accommodate the rod body 200, the two sides of the two half hoops are provided with connecting lugs, and the connecting lugs are tightly held on the rod body 200 through locking pieces after being combined in pairs. The third connecting plate 302 is disposed on the outer surface of the half hoop, and the plate surface is perpendicular to the outer surface of the half hoop, that is, the third connecting plate 302 extends from the outer surface of the half hoop away from the half hoop, the fourth connecting plate 303 is disposed on one side plate surface of the third connecting plate 302, and the fourth connecting plate 303 is disposed perpendicular to the third connecting plate 302 and extends along the axial direction of the hoop 301. A plurality of through holes are formed in the third connecting plate 302, a plurality of through holes are correspondingly formed in the first connecting plate 1123 of the first connecting fitting 1120, and the other side plate surface of the third connecting plate 302 is fixedly connected with the first connecting plate 1123 through a retaining member after being attached. The two half hoops of the hoop 301 may be provided with a third connecting plate 302 and a fourth connecting plate 303.

The second connection hardware 1130 includes a flange cylinder, a flange plate, and a hanging portion. The flange cylinder is axially arranged into a hollow structure and sleeved at the end part of the insulator; the flange plate is used for sealing one end, far away from the insulator, of the flange cylinder, and the hanging part is arranged on one side, far away from the flange cylinder, of the flange plate so as to form a first hanging line point.

In order to equalize the electric field of the first pillar composite insulator 1110, grading rings 1140 are further sleeved on the peripheries of the end portions at the two ends of the first pillar composite insulator. Meanwhile, in order to improve the installation efficiency, the equalizing ring 1140 is arranged to be connected with the connecting hardware fitting through the connecting bracket.

In order to enhance the structural stability and reduce the corridor width, the second composite cross arm 120 is a triangular structure, and includes a second pillar composite insulator 1210 and two second cross arm insulators 1220, preferably, the two second cross arm insulators 1220 are insulators with the same size and material, so that the second composite cross arm 120 is in an isosceles triangle structure, and the second composite cross arm 120 can uniformly bear the wire hanging force. One ends of the two second cross arm insulators 1220 are connected to each other by a triangular yoke plate 121 to form the top end of a triangular structure, and the other ends are connected to two ends of the second post composite insulator 1210 respectively to form two second free ends. Two hanging points are respectively formed on the two second free ends and used for hanging and connecting a lead, and for convenience of expression, the hanging point far away from the rod body 200 is a second hanging point, and the hanging point close to the rod body 200 is a third hanging point. The second composite cross arm 120 is fixedly connected with the first wire hanging point through a triangular connecting plate 121, and meanwhile, a wire hung on the first wire hanging point can also be hung through the triangular connecting plate 121. That is, the wire hooked on the first composite cross arm 110 may be directly hooked on the wire hooking portion of the second link fitting 1130 or may be hooked on the triangular yoke plate 121, and only the wire hooking portion is required to be hooked on the position of the first wire hooking point, which may be flexibly selected according to actual situations.

The second post composite insulator 1210 includes an insulator and a shed covering the periphery of the insulator, and is the same as the insulator and the shed of the first post composite insulator 1110, which is not described herein again. The second post composite insulator 1210 further includes two third connecting fittings 1211 fixedly connected to both ends of the insulator, respectively. The third connection fitting 1211 includes a flange cylinder and a flange plate. The flange cylinder is axially arranged into a hollow structure and sleeved at the end part of the insulator; the flange plate covers one end of the flange cylinder far away from the insulator, wherein the flange cylinder and the flange plate can be integrally formed, or can be separately formed and then connected together through welding and the like. The flange plate is provided with a wire hanging hole for hanging a wire, and the wires hung on the second wire hanging point and the third wire hanging point can be realized by hanging the wires in the wire hanging hole of the flange plate.

The second cross arm insulator 1220 may be a post composite insulator or a diagonal composite insulator. When the second cross arm insulator 1220 is a cable-stayed composite insulator, the second cross arm insulator 1220 is the second cable-stayed composite insulator 1220. The second cable-stayed composite insulator 1220 comprises a core rod, a sheath wrapped outside the core rod, at least one umbrella skirt arranged on the outer wall of the sheath, and two hardware fittings arranged at two ends of the core rod. The core rod is formed by pultrusion of glass fiber impregnated by epoxy resin, and can also be formed by other modes such as compression molding, winding molding and the like, and can also be made of other materials such as glass fiber impregnated by vinyl ester resin. The sheath and the umbrella skirt are integrally formed and coated on the core rod by high-temperature vulcanized silicone rubber through injection molding, wherein the sheath is arranged between the core rod and the umbrella skirt. It is of course conceivable that the sheath could also be made separately from the skirt and then combined. The sheath is coated on the whole core rod, and part of the sheath is coated on the hardware fitting. The hardware fitting comprises a sleeve portion sleeved on the end portion of the core rod and a connecting plate arranged on one side, far away from the core rod, of the sleeve portion, and a connecting hole is formed in the connecting plate. The second diagonal composite insulator 1220 is connected to the triangular yoke plate 121 and the second pillar composite insulator 1210 by hardware fittings.

When the second cross arm insulator 1220 is a post composite insulator, the second cross arm insulator 1220 is a third post composite insulator 1220. The structure and material of the third post composite insulator 1220 are similar to those of the second post composite insulator 1210, and are not described herein again. Of course, in another embodiment, the third post composite insulator may have the same size as the second post composite insulator, such that the second composite cross arm has an equilateral triangle structure.

In other embodiments, the sizes of the two second cross arm insulators may be different, so that the second composite cross arm is in a scalene triangle structure, and thus the two phase wires hooked on the second wire hanging point and the third wire hanging point on the second composite cross arm are not in the same horizontal line, so that the three phase wires are arranged in three layers along the vertical direction of the rod body, and of course, the wires hooked on the second composite cross arm can meet the requirement of the electrical gap.

In order to equalize the electric field of the second composite cross arm 120, grading rings 1140 are respectively sleeved on the peripheries of the two ends of the second post composite insulator 1210 and the peripheries of the two ends of the second cross arm insulator 1220.

The triangular yoke plate 121 is a triangular metal plate, and a plurality of through holes are formed in the triangular metal plate for connecting with other components. With reference to fig. 1, the triangular connecting plate 121 is an isosceles triangle, and three corners of the triangular connecting plate are respectively provided with a through hole. The apex angle and the first free end fixed connection of triangle yoke plate 121 to with the compound cross arm 120 of second and the compound cross arm 110 fixed connection of first, through-hole and the hanging that sets up on the portion of hanging of second attach fitting 1130 that specifically sets up on the apex angle through triangle yoke plate 121 connect through retaining member fastening connection after the hole cooperation, certainly also can adopt other modes such as welding. Two base angles of the triangular yoke plate 121 are respectively connected with one ends of the two second cross arm insulators 1220, and specifically, the through holes arranged on the base angles are matched with the connecting holes in the hardware fittings of the second cross arm insulators 1220 and then are fixedly connected through locking pieces. The bottom edge of the triangular connecting plate 121 is provided with a wire hanging hole for hanging a wire.

Of course, in other embodiments, the first composite cross arm may also include two, three or more first pillar composite insulators, and the plurality of first pillar composite insulators are connected to each other and arranged in a straight line; the second composite cross arm can also be hung at any position of the first composite cross arm far away from the rod body, and the wire hung on the second composite cross arm can meet the requirement of an electrical gap.

Further, in order to optimize the height of the transmission pole 10, both the second free ends are located at the same level and respectively hook the wires. That is, the second post composite insulator 1210 is horizontally disposed, the second composite cross arm 120 is an isosceles triangle structure, and the wires connected to the two second free ends of the second composite cross arm 120 are located at the same horizontal height. The two-phase wire that articulates on the second string line point of the compound cross arm 120 of second and the third string line point is located the lower floor to, three-phase wire is the double-deck setting along the vertical direction of the body of rod 200. The first composite cross arm 110 and the second composite cross arm 120 can be used for hanging single-loop wires, and one side of the transmission pole 10 can be used for hanging single-loop three-phase wires, so that the connection stability and the interphase insulation performance of each wire in the transmission tower can be improved, the structure is compact, and the stress is balanced.

In some application scenarios, referring to fig. 4, both sides of the mast body 200 of the power transmission mast 10 are provided with composite cross arms 100, and the two composite cross arms 100 are symmetrically arranged about the mast body 200. Composite cross arm 100 includes a first composite cross arm 110 and a second composite cross arm 120. The two first composite cross arms 110 and the rod body 200 are connected to the same position through the hoop 300, and the two first free ends of the two first composite cross arms 110 are located on the same horizontal plane. The four second free ends of the two second compound cross arms 120 are located on the same horizontal plane. The hanging points on the first free end and the second free end are used for hanging the conducting wires, and the composite cross arm 100 on each side of the rod body 200 can be hung with the three-phase conducting wires, so that the power transmission rod 10 can be hung with the double-loop conducting wires.

In other embodiments, the two first composite cross arms may also be arranged in a "V" shape in the same vertical plane, that is, the two first pillar composite insulators are disposed obliquely upward or obliquely downward; and two second composite cross arms can also be arranged in a V shape in the same vertical plane, namely two second pillar composite insulators are obliquely arranged upwards or obliquely downwards, as long as the two first free ends of the first composite cross arm and the wire hanging points on the four second free ends of the second composite cross arm can be used for hanging the wires. Preferably, first pillar composite insulator and second pillar composite insulator all incline upwards and set up, can reduce the whole height of the body of rod to practice thrift the cost, and first pillar composite insulator and second pillar composite insulator bear the wire and articulate intensity better.

In still other application scenarios, in order to improve the structural strength of the composite cross arm 100, as shown in fig. 5, on the basis of the structure shown in fig. 4, the first composite cross arm 110 further includes a first cable-stayed composite insulator 1150, one end of the first cable-stayed composite insulator 1150 is fixedly connected to the first free end of the first pillar composite insulator 1110, and the other end is fixedly connected to the rod 200 above the first pillar composite insulator 1110. Through setting up first composite insulator 1150 to one side for form the triangle-shaped structure between first composite cross arm 110 and the body of rod 200, further promoted composite cross arm 100's overall structure stability. In other embodiments, the first composite cross arm may also include two or more first cable-stayed composite insulators, one end of each of the first cable-stayed composite insulators is fixedly connected to the first free end, and the other end of each of the first cable-stayed composite insulators is sequentially and fixedly connected to the rod body above the connection position of the first pillar composite insulator and the rod body. Or, one end of each of the first diagonal composite insulators can be sequentially connected to the part of the first pillar composite insulator, which is far away from the rod body, and the other end of each of the first diagonal composite insulators is sequentially fixedly connected with the rod body above the connecting position of the first pillar composite insulator and the rod body, so that specific limitation is not required, and only the structural strength of the composite cross arm needs to be enhanced.

In other application scenarios, on the basis of the structure shown in fig. 4, as shown in fig. 6, in order to enhance the stability of the composite cross arm 100 and prevent windage yaw, the composite cross arm 100 further includes a third cross arm insulator 1300, and both ends of the third cross arm insulator 1300 are respectively fixedly connected to the second composite cross arm 120 and the rod body 200. Due to the arrangement of the third cross arm insulator 1300, the connection point between the second composite cross arm 120 and the rod body 200 can be increased, windage yaw swing of the second composite cross arm 120 in the extending direction of the lead wire is prevented, and the connection stability of the composite cross arm 100 is enhanced.

In the aforementioned embodiment, that is, the power transmission pole 10 shown in fig. 4 and 5, since the second composite cross arm 120 and the first composite cross arm 110 are connected only by the triangular yoke 121, the structural stability of the second composite cross arm 120 is not strong when windage yaw occurs in the direction in which the conductor extends, and therefore the power transmission pole 10 can be used only for a tangent tower line and not for a tension tower line. In the present embodiment, the third cross arm insulator 1300 is provided to connect and fix the second composite cross arm 120 to the rod body 200 through the third cross arm insulator 1300, so that the stability of the second composite cross arm 120 is further improved, and thus the power transmission pole 10 can be used for both tangent tower wire hanging and tension tower wire hanging. This is because, under normal operation, the tangent tower only bears vertical load and horizontal wind load (i.e. horizontal load), and the tension tower can bear larger tension along the line direction, including longitudinal unbalanced tension generated by broken line, or load caused by anchoring wires and lightning conductor during construction and maintenance, besides having the same bearing capacity as the tangent tower. Therefore, the tension tower wire needs a higher mechanical strength of the transmission pole to support than the tangent tower wire, and then the second composite cross arm 120 needs a higher strength of the post composite insulator.

The third cross arm insulator 1300 preferably adopts a post composite insulator, and the power transmission pole 10 can be used for a tension tower hanging wire or a tangent tower hanging wire at the moment; certainly, the third cross arm insulator 1300 may also adopt an insulator such as a line composite insulator or an insulating rod, and the power transmission rod 10 may only be used for hanging a line on a tangent tower, because the strength of the line composite insulator against windage yaw is not enough, the difference between the tangent tower and the tension tower is the same as the above, and the description is omitted.

The second cross arm insulator 1220 may be a post composite insulator or a cable-stayed composite insulator, and when the power transmission pole 10 is used for hanging a line on a strain tower, the second cross arm insulator 1220 is the post composite insulator; when transmission pole 10 is used for the tangent tower to hang the line, second cross arm insulator 1220 is for drawing composite insulator or pillar composite insulator to one side, and the difference of concretely relating to tangent tower and strain insulator tower is unanimous with the aforesaid, and is no longer described.

Preferably, the second post composite insulator 1210 and the third cross arm insulator 1300 are coaxially and horizontally arranged, so that the third cross arm insulator 1300 bears the minimum windage yaw tension of the wire, and the length of the third cross arm insulator 1300 is the shortest at this time, thereby saving the cost the most. Specifically, one end of the third cross arm insulator 1300 is provided with a first flange connected to the rod body 200 through the hoop, the structure of the first flange is the same as the first connection fitting 1120 of the first pillar composite insulator 1110, and the hoop structure and the connection mode with the rod body 200 are also the same as above, which is not repeated herein. The other end of third cross arm insulator 1300 sets up the third link fitting 1211 fixed connection that is close to body of rod 200 one side on second flange and the second pillar composite insulator 1210, and the second flange is the same with third link fitting 1211's structure, and it can to pass through retaining member fastening connection after with the ring flange butt of both. At this time, because the third cross arm insulator 1300 is provided, only one end of the second post composite insulator 1210 away from the rod body 200 in the second composite cross arm 120 is a second free end, a connection point of the third cross arm insulator 1300 and the second post composite insulator 1210 is used as a third wire hanging point, the wire can still be hung in the wire hanging hole of the flange, and the second composite cross arm 120 still hangs the two-phase wire through the second wire hanging point and the third wire hanging point. At this moment, a right-angled trapezoid structure is formed between the composite cross arm 100 and the rod body 200, all the components are stably connected, the mechanical performance is good, the stress is balanced, and the stability is good. When the two sides of the rod body 200 are connected with the composite cross arms 100, the whole body is of an isosceles trapezoid structure, the structure is stable, the whole stress is balanced, the force transmission is clear, and the appearance is attractive.

In other embodiments, the third cross arm insulator may be connected between the second cross arm insulator and the rod body, and the third cross arm insulator may be disposed obliquely as long as a connection point between the second composite cross arm and the rod body can be increased, in which case the second composite cross arm still has two second free ends for hooking the two phase wires.

In another embodiment, in order to improve the structural strength of the composite cross arm 100, as shown in fig. 7, in addition to the structure shown in fig. 6, the first composite cross arm 110 further includes a first cable-stayed composite insulator 1150, and the first cable-stayed composite insulator 1150 is identical to the first cable-stayed composite insulator 1150 of the structure shown in fig. 5, and thus the description thereof is omitted. Through setting up first composite insulator 1150 to one side for form the triangle-shaped structure between first composite cross arm 110 and the body of rod 200, further strengthen composite cross arm 100's stability, prevent windage yaw, improve overall structure stability.

In yet another embodiment, as shown in fig. 8, composite cross arm 100 includes a first composite cross arm 110, a second composite cross arm 120 and a third cross arm insulator 1300, wherein first composite cross arm 110 includes a first cable-stayed composite insulator 1150, one end of first cable-stayed composite insulator 1150 is connected to rod body 200, and the other end of first cable-stayed composite insulator 1150 is connected to second composite cross arm 120 to form a first cable hanging point. The second composite cross arm 120 has the same structure as the above structure, and is not described herein again. Compared with the composite cross arm 100 in fig. 7, the first composite cross arm 110 of the present embodiment includes only one first diagonal composite insulator 1150, and does not include the first pillar composite insulator 1110, and can also achieve hooking of three-phase wires, prevent windage yaw, and save cost. The diameter of the first cable-stayed composite insulator 1150 can be increased under the condition of large bearing load to ensure the stability of the whole structure.

In yet another embodiment, as shown in fig. 9, composite cross arm 100 includes a first composite cross arm 110, a second composite cross arm 120. First composite cross arm 110 includes a first pillar composite insulator 1110, a first oblique-pulling composite insulator 1150, first composite cross arm 110 one end and body of rod 200 fixed connection, the other end is a first free end, forms first hanging wire point A1 on the first free end. The second composite cross arm 120 comprises four second cross arm insulators 1220 and a second pillar composite insulator 1210, the four second cross arm insulators 1220 are connected end to form a diamond structure, the second pillar composite insulator 1210 is horizontally arranged, and two ends of the second pillar composite insulator 1210 are respectively and fixedly connected with two vertexes of the diamond structure, which are distributed along the horizontal direction, so as to enhance the structural stability of the second composite cross arm 120. The second cross arm insulator 1220 is identical to the second cross arm insulator 1220 shown in fig. 1 in structure and material, and is not repeated here.

Specifically, the second post composite insulator 1210 is horizontally disposed. Among the four second cross arm insulators 1220, two second cross arm insulators 1220 located above form a triangular structure with the second post composite insulator 1210, one ends of the two second cross arm insulators 1220 are connected with each other through the triangular connecting plate 121 to form the top end of the triangular structure, and the other ends are connected to two ends of the second post composite insulator 1210 respectively to form two second free ends. Two wire hanging points are respectively formed on the two second free ends, the wire hanging point far away from the rod body 200 is a second wire hanging point A2, and the wire hanging point close to the rod body 200 is a third wire hanging point A3. Two second cross arm insulators 1220 that are located below also form a triangular structure with second pillar composite insulator 1210, and one end of these two second cross arm insulators 1220 is connected each other through triangle yoke plate 122 and forms the bottom of triangular structure, and the other end is connected to second pillar composite insulator 1210 both ends respectively in the below of second pillar composite insulator 1210, and triangle yoke plate 122 department forms fourth string A4.

The composite cross arm 100 is used for hanging three-phase wires, and three-phase wires can be hung at any three of a first wire hanging point A1, a second wire hanging point A2, a third wire hanging point A3 and a fourth wire hanging point A4.

In an application scene, a first hanging line point A1 is used for hanging a first phase conductor, any one of a second hanging line point A2 and a third hanging line point A3 is used for hanging a second phase conductor, a fourth hanging line point A4 is used for hanging a third phase conductor, all the conductors hung on the power transmission pole 10 are arranged in three layers in the vertical direction, the connection stability is high, and the phase-to-phase insulation performance is good. That is, the first composite cross arm 110 is connected with a conducting wire of one phase, and the second composite cross arm 120 is connected with a conducting wire of two phases. Preferably, a first wire hanging point A1, a second wire hanging point A2 and a fourth wire hanging point A4 are selected to hang the three-phase wire.

In another application scene, select second hanging wire point A2, third hanging wire point A3, fourth hanging wire point A4 and be used for articulating the three-phase wire, all wires that articulate on the transmission of electricity pole 10 at this moment are two-layer setting along vertical direction, and need not to pass triangular structure when three hanging wire point articulates the wire, construction convenience. At this time, the first composite cross arm 110 is not connected with the wires, and the second composite cross arm 120 is connected with the three-phase wires.

In this embodiment, the vertices of the second composite cross arms 120, which are connected to each other through the second cross arm insulators 1220 but not connected to the second post composite insulators 1210, are connected to the first free ends to prevent the diamond structure from being deformed. Of course, in other embodiments, the second composite cross arms may be connected to each other through the second cross arm insulators, and the vertex connected to the second post composite insulator may be connected to the first free end, in which case the second post composite insulator is vertically disposed.

In another embodiment, as shown in fig. 10, in addition to the structure shown in fig. 9, the composite cross arm 100 further includes a third cross arm insulator 1300 in order to enhance the stability of the composite cross arm 100 and prevent windage yaw. Both ends of third cross arm insulator 1300 are respectively fixedly connected with second composite cross arm 120 and rod body 200. Specifically, one end of the third cross arm insulator 1300 is provided with a first flange connected to the rod 200 through the hoop, the structure of the first flange is the same as the first connection fitting 1120 of the first pillar composite insulator 1110, and the hoop structure and the connection mode with the rod 200 are also the same as those in the foregoing fig. 6, which is not repeated herein. The other end of third cross arm insulator 1300 sets up the third link fitting 1211 fixed connection that is close to body of rod 200 one side on second flange and the second pillar composite insulator 1210, and the second flange is the same with third link fitting 1211's structure, and it can through retaining member fastening connection after with the ring flange butt between them. The third cross arm insulator 1300 can increase the connection point between the second composite cross arm 120 and the rod body 200, prevent windage yaw of the second composite cross arm 120 in the extension direction of the wire, and enhance the connection stability of the composite cross arm 100.

In some application scenarios, the composite cross arm 100 may further include a fourth cross arm insulator 1400, and referring to fig. 11, one end of the fourth cross arm insulator 1400 is fixedly connected to the rod 200, and the other end is fixedly connected to the second composite cross arm 120. Specifically, in the second composite cross arm 120, the lower end of the second cross arm insulator 1220 connected with each other but not connected with the second post composite insulator 1210 is fixedly connected with the fourth cross arm insulator 1400, that is, the other end of the fourth cross arm insulator 1400 is connected to the triangular yoke plate 122, so as to further enhance the structural stability of the second composite cross arm 120. The second cross arm insulator 1220 has the same structure and material as the second cross arm insulator 1220 shown in fig. 9, and is not repeated herein. In another embodiment, the composite cross arm may include only the first composite cross arm, the second composite cross arm, and the fourth cross arm insulator, and the third cross arm insulator is not provided.

Further, in order to solve the above technical problem, the present application also provides a power transmission pole 10. As shown in fig. 1 to 11, the power transmission pole 10 includes a vertically arranged pole body 200 and a composite cross arm 100 fixedly connected to the pole body 200. Preferably, in order to optimize the force structure of the transmission pole 10, two sets of composite cross arms 100 are symmetrically arranged on both sides of the pole body 200. Of course, in other embodiments, one, three, four or more sets of composite cross arms may be disposed on the power transmission pole, and the sets of composite cross arms may also be disposed on two sides of the pole body asymmetrically, which is not limited herein based on actual requirements.

The beneficial effect of this application is: compared with the prior art, the composite cross arm adopting the structure has good interphase insulation performance and high wire transmission capacity, and can also reduce the width of a line corridor; the upper cross arm is shorter, so that the height of the lightning conductor bracket and the lightning protection distance can be shortened; the whole stress is balanced, the force transmission is clear, and the appearance is beautiful.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (13)

1. A composite cross arm is fixedly connected to a rod body of a power transmission pole and is characterized by comprising a first composite cross arm and a second composite cross arm;

one end of the first composite cross arm is fixedly connected with the rod body, the other end of the first composite cross arm is a first free end, and the part of the first composite cross arm, which is far away from the rod body, is used for hanging a lead;

the second composite cross arm is hung on the part of the first composite cross arm, which is far away from the rod body, and is used for hanging at least two phases of conducting wires;

all the leads are arranged in a double-layer mode at least along the vertical direction.

2. The composite cross arm of claim 1, wherein the first composite cross arm comprises at least one first post composite insulator, one end of the first post composite insulator is fixedly connected to the rod body, and the other end of the first post composite insulator is the first free end.

3. The composite cross arm of claim 2, wherein the first composite cross arm further comprises at least one first cable-stayed composite insulator, one end of the first cable-stayed composite insulator is fixedly connected with the portion of the first post composite insulator far away from the rod body, and the other end of the first cable-stayed composite insulator is fixedly connected with the rod body above the first post composite insulator.

4. The composite cross arm of claim 1, wherein the second composite cross arm is of a triangular structure and comprises a second post composite insulator and two second cross arm insulators, one end of each of the two second cross arm insulators is connected to form a top end of the triangular structure, the other end of each of the two second cross arm insulators is connected to two ends of the second post composite insulator to form two second free ends, and the second composite cross arm is fixedly connected to the first free end through the top end.

5. A composite cross arm according to claim 4, wherein the two second free ends are at the same level.

6. The composite cross arm of claim 4, further comprising a third cross arm insulator, wherein both ends of the third cross arm insulator are fixedly connected to the second composite cross arm and the rod body, respectively.

7. The composite cross arm of claim 4, wherein two of said second cross arm insulators are connected by a triangular yoke plate, and wherein said second composite cross arm is connected to said first free end by said triangular yoke plate.

8. The composite cross arm of claim 6, wherein the second post composite insulator and the third cross arm insulator are coaxially and horizontally disposed.

9. The composite cross arm of claim 1, wherein the second composite cross arm comprises four second cross arm insulators and a second post composite insulator, the four second cross arm insulators are connected end to form a diamond structure, and two ends of the second post composite insulator are respectively and fixedly connected with two vertexes of the diamond structure.

10. The composite cross arm of claim 9, wherein the second post composite insulator is horizontally disposed, and the second composite cross arm is connected to the first free end through any vertex of the diamond-shaped structure that is not connected to the second post composite insulator.

11. The composite cross arm of claim 9, wherein the second post composite insulator is vertically disposed, and the second composite cross arm is connected to the first free end through any vertex of the diamond-shaped structure that is connected to the second post composite insulator.

12. The composite cross arm of claim 9, further comprising a fourth cross arm insulator, wherein one end of the fourth cross arm insulator is fixedly connected to the rod body, and the other end of the fourth cross arm insulator is fixedly connected to the lower end point of the diamond structure.

13. A power transmission pole comprising a vertically arranged pole body and a plurality of composite cross arms fixedly connected to the pole body, wherein the composite cross arms employ a composite cross arm as claimed in any one of claims 1 to 12.

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