Folding cross arm and transmission pole

Abstract

The present invention discloses an insulating crossarm and a transmission pole, wherein the insulating crossarm comprises a first crossarm and a second crossarm arranged oppositely, a first root connecting fitting is arranged at one end of the first crossarm, a second root connecting fitting is arranged at one end of the second crossarm, a first pin hole is arranged at the end of the first root connecting fitting away from the first crossarm, a second pin hole is arranged at the end of the second root connecting fitting away from the second crossarm, and the first crossarm and the second crossarm are hinged by a first pin shaft after the first pin hole and the second pin hole are matched with each other. The insulating crossarm of the present invention has a simple structure, is lightweight and high-strength, is corrosion-resistant and aging-resistant, and has good insulation performance. The folded insulating crossarm reduces the transportation volume and transportation costs, and is convenient and efficient to install on site. The insulating crossarm is applicable to a variety of pole bodies and has universality. The present invention also discloses a transmission pole.

Description

Technical Field

[0001] The invention relates to the field of power transmission insulation equipment, and more specifically to an insulating cross arm and a power transmission pole. Background Art

[0002] In the field of power equipment, the insulated crossarms used in transmission lines are important supporting structural parts of transmission poles, used to support conductors, lightning arresters, etc., and to keep them at a certain safety distance as required. Currently, iron crossarms are mostly used in transmission lines, which have poor insulation and are prone to flashover problems. In addition, the crossarm tower head needs to be composed of multiple crossarms, which need to be transported separately. When installing on site, they need to be assembled under the tower in advance before they can be fixed on the tower, and the steps are relatively complicated. Summary of the invention

[0003] In view of the deficiencies of the prior art, the object of the present invention is to provide an insulating cross arm and a transmission pole to solve the problems of high transportation costs and complicated on-site installation steps of the existing cross arm.

[0004] In order to achieve the above-mentioned invention objectives, the technical means adopted by the present invention are as follows: an insulating crossarm, comprising a first crossarm and a second crossarm arranged opposite to each other, a first root connecting fitting is arranged at one end of the first crossarm, a second root connecting fitting is arranged at one end of the second crossarm, a first pin hole is arranged at the end of the first root connecting fitting away from the first crossarm, and a second pin hole is arranged at the end of the second root connecting fitting away from the second crossarm, and the first crossarm and the second crossarm are hinged by a first pin shaft after the first pin hole and the second pin hole correspond to each other.

[0005] The above-mentioned insulating crossarm is hinged by setting pin holes in the root hardware of the two insulating crossarms and passing pin shafts through the two pin holes, that is, the first crossarm and the second crossarm after hinged can rotate relatively freely. When the angle between the first crossarm and the second crossarm is 0°, it is the state of the insulating crossarm after folding, which can reduce the transportation volume, reduce the transportation cost, and facilitate packaging and transportation; when the angle between the first crossarm and the second crossarm is 180°, it is the state of the insulating crossarm after unfolding, and can be directly connected to the transmission pole, eliminating the splicing assembly before the installation of the insulating crossarm, making the on-site installation convenient, fast and efficient.

[0006] Preferably, a first fixing plate is provided at the end of the first root connecting hardware away from the first crossarm, and a second fixing plate is provided at the end of the second root connecting hardware away from the second crossarm, a first fixing hole is provided on the first fixing plate, and a second fixing hole is provided on the second fixing plate, the first fixing hole and the second fixing hole correspond to each other and are fixedly connected through a locking piece, so that the first crossarm is fixedly connected to the second crossarm and the axis of the first crossarm and the axis of the second crossarm are parallel to each other, so that the unfolded insulating crossarm cannot rotate relatively freely and remains stable, which is convenient for fixed connection with the transmission pole and ensures stable operation of the insulating crossarm.

[0007] Preferably, the first fixing plate and the second fixing plate are both L-shaped, the center of the first fixing hole is located in the vertical or horizontal plane where the axis of the first crossarm is located, the line formed by the center of the first pin hole and the center of the first fixing hole is perpendicular to the axis of the first crossarm, the center of the second fixing hole is located in the vertical or horizontal plane where the axis of the second crossarm is located, and the line formed by the center of the second pin hole and the center of the second fixing hole is perpendicular to the axis of the second crossarm, providing space for the relative rotation of the first crossarm and the second crossarm, thereby facilitating the folding and unfolding of the insulating crossarm.

[0008] Preferably, the number of the first fixing plate and the second fixing plate is one, and a baffle is provided at an end portion of the first fixing plate away from the first pin hole, and the baffle is vertically arranged on a side of the first fixing plate close to the second fixing plate, so that the first crossarm and the second crossarm can be positioned to a coaxial position of the first crossarm and the second crossarm after changing from a folded state to an unfolded state, and the position can be maintained to facilitate fixed connection of the first crossarm and the second crossarm, while also reducing the material used for the first fixing plate and the second fixing plate.

[0009] Preferably, there are two first fixing plates and two second fixing plates, the two first fixing plates and the two second fixing plates are arranged in parallel, and at least one first fixing plate is inserted between the two second fixing plates to firmly connect the first cross arm and the second cross arm.

[0010] Preferably, the above-mentioned insulating crossarm also includes a top phase crossarm arranged perpendicularly to the first crossarm, a third root connecting hardware is arranged at one end of the top phase crossarm, a third pin hole is arranged at the end of the third root connecting hardware away from the top phase crossarm, a fourth pin hole is arranged on the first crossarm, and after the third pin hole and the fourth pin hole are matched, the top phase crossarm is hinged to the first crossarm through the second pin shaft.

[0011] The above-mentioned insulating crossarms are arranged in a triangle, and the top phase crossarm and the first crossarm after being hinged can rotate relatively freely. When the angle between the top phase crossarm and the first crossarm is 0°, it is the state of the insulating crossarm after folding, which can reduce the transportation volume, reduce transportation costs, and facilitate packaging and transportation; when the angle between the top phase crossarm and the first crossarm is 90°, it is the state of the insulating crossarm after unfolding, and can be directly connected to the transmission pole, eliminating the splicing assembly before the crossarm installation, making on-site installation convenient, fast and efficient.

[0012] Preferably, a threaded hole is provided at the end of the third root connecting fitting away from the top phase crossarm, and the top phase crossarm is fixedly connected to the first crossarm and the second crossarm through the threaded holes and fasteners, so that the insulating crossarm can be firmly connected after being unfolded.

[0013] Preferably, a top phase wire hanging fitting is provided at the other end of the top phase cross arm, and the top phase wire hanging fitting includes a connecting part connected to the main body of the top phase cross arm and a winding part provided on the connecting part, and the diameter of the winding part is smaller than the diameter of the connecting part, so as to facilitate the binding of the wires.

[0014] Preferably, a support platform is provided at one end of the winding portion away from the connecting portion, and a wire groove is provided on the support platform for hanging the wire.

[0015] To achieve the above-mentioned purpose, another technical solution adopted by the present invention is as follows: a transmission pole is provided, comprising a pole body and any of the above-mentioned insulating cross arms fixed on the pole body.

[0016] The insulating cross arm provided by the present invention is foldable, and at least two cross arms are hinged by a pin shaft and can rotate relatively freely so that the insulating cross arm can maintain a folded state and an unfolded state. The folded insulating cross arm is small in size and easy to transport, and the unfolded insulating cross arm can be firmly connected and can be directly connected to the transmission pole, eliminating the need for splicing and assembling before the installation of the insulating cross arm, making on-site installation convenient, fast and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an insulating cross arm 10 according to a first embodiment of the present invention;

[0018] Figure 2 1 is a schematic structural diagram of a first root connection fitting 100 according to a first embodiment of the present invention;

[0019] Figure 3 is a schematic structural diagram of the second root connection fitting 200 according to the first embodiment of the present invention;

[0020] Figure 4 is a structural schematic diagram of another view of the insulating cross arm 10 of the first embodiment of the present invention;

[0021] Figure 5 is a schematic structural diagram of an insulating cross arm 20 according to a second embodiment of the present invention;

[0022] Figure 6 is a schematic structural diagram of a first root connection fitting 300 according to a second embodiment of the present invention;

[0023] Figure 7 is a schematic structural diagram of a second root connection fitting 400 according to a second embodiment of the present invention;

[0024] Figure 8 is a schematic structural diagram of a third root connection fitting 500 according to the second embodiment of the present invention;

[0025] Fig. 9 1 is a schematic structural diagram of a top phase hanging wire fitting 600 according to a second embodiment of the present invention;

[0026] Fig.10 is a schematic structural diagram of an insulating cross arm 30 according to a third embodiment of the present invention;

[0027] Fig.11 is a schematic structural diagram of a first root connection fitting 700 according to a third embodiment of the present invention;

[0028] Fig.12 is a schematic structural diagram of a second root connection fitting 800 according to a third embodiment of the present invention;

[0029] Fig.13 It is a schematic structural diagram of the third root connection fitting 900 of the third embodiment of the present invention. DETAILED DESCRIPTION

[0030] Upon request, specific embodiments of the present invention will be disclosed herein. However, it should be understood that the embodiments disclosed herein are merely typical examples of the present invention, which may be embodied in various forms. Therefore, the specific details disclosed herein are not to be considered restrictive, but merely as a basis for the claims and as a representative basis for teaching those skilled in the art to apply the present invention in various ways in any appropriate manner in practice, including using the various features disclosed herein and in combination with features that may not be explicitly disclosed herein.

[0031] The "connection" described in the present invention should be understood in a broad sense, unless otherwise clearly specified or limited, and can be directly connected or connected through an intermediate medium. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by "upper", "lower", "horizontal", "vertical", "side", "end", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0032] Embodiment 1:

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, the present embodiment provides an insulating cross arm 10, which includes a first cross arm 11 and a second cross arm 12 arranged opposite to each other. A first root connecting fitting 100 is arranged at one end of the first cross arm 11, and a second root connecting fitting 200 is arranged at one end of the second cross arm 12. A first pin hole 122 is arranged at the end of the first root connecting fitting 100 away from the first cross arm 11, and a second pin hole 222 is arranged at the end of the second root connecting fitting 200 away from the second cross arm 12. After the first pin hole 122 and the second pin hole 222 are matched with each other, the first cross arm 11 and the second cross arm 12 are hingedly connected through a first pin shaft 001.

[0034] Specifically, Figure 2 As shown, the first root connection fitting 100 includes a body 110, a first fixing plate 120 and two connecting ears 130. The first fixing plate 120 is an L-shaped flat plate, which is located at the end of the first root connection fitting 100 away from the first cross arm 11. The plate surface of the first fixing plate 120 is horizontally arranged, and the first fixing hole 121 and the first pin hole 122 are arranged on the first fixing plate 120. The through direction of the first fixing hole 121 and the first pin hole 122 is perpendicular to the plate surface of the first fixing plate 120, and the center of the first fixing hole 121 is located in the vertical plane where the axis of the first cross arm 11 is located, and the line formed by the center of the first pin hole 122 and the center of the first fixing hole 121 is perpendicular to the axis of the first cross arm 11. The main body 110 includes an upper surface 111 and a lower surface 112 that are arranged opposite to each other. Two square flat connecting ears 130 are symmetrically arranged on the upper surface 111 and the lower surface 112 respectively. The plate surfaces of the two connecting ears 130 are arranged vertically. Both connecting ears 130 are provided with connecting holes 131, and the penetration direction of the connecting holes 131 is perpendicular to the plate surfaces of the connecting ears 130.

[0035] like Figure 3 As shown, the second root connection fitting 200 has the same structure as the first root connection fitting 100, specifically including a body 210, a second fixing plate 220 and two connecting ears 230. The second fixing plate 220 is an L-shaped flat plate, located at the end of the second root connection fitting 200 away from the second cross arm 12, the plate surface of the second fixing plate 220 is horizontally arranged, and a second fixing hole 221 and a second pin hole 222 are arranged on the second fixing plate 220, the through direction of the second fixing hole 221 and the second pin hole 222 is perpendicular to the plate surface of the second fixing plate 220, and the center of the second fixing hole 221 is located in the vertical plane where the axis of the second cross arm 12 is located, and the line formed by the center of the second pin hole 222 and the center of the second fixing hole 221 is perpendicular to the axis of the second cross arm 12. The main body 210 includes an upper surface 211 and a lower surface 212 that are arranged opposite to each other. Two square flat connecting ears 230 are symmetrically arranged on the upper surface 211 and the lower surface 212 respectively. The plate surfaces of the two connecting ears 230 are arranged vertically. Both connecting ears 230 are provided with connecting holes 231, and the penetration direction of the connecting holes 231 is perpendicular to the plate surfaces of the connecting ears 230.

[0036] After the first pin hole 122 and the second pin hole 222 cooperate, the first cross arm 11 and the second cross arm 12 are hingedly connected through the first pin shaft 001, so that the first cross arm 11 and the second cross arm 12 can rotate relatively freely in the horizontal plane. Of course, the plate surfaces of the first fixing plate 120 and the second fixing plate 220 can also be set vertically, so that the first cross arm 11 and the second cross arm 12 can rotate relatively freely in the vertical plane.

[0037] Furthermore, if Figure 1As shown, in one embodiment, the number of the first fixing plate 120 and the second fixing plate 220 are both two, and at least one first fixing plate 120 is inserted between the two second fixing plates 220, so that the first cross arm 11 and the second cross arm 12 are firmly connected. At the same time, the first fixing plate 120 and the second fixing plate 220 are L-shaped, which can provide sufficient space for the relative free rotation of the first cross arm 11 and the second cross arm 13, and facilitate the folding and unfolding of the insulating cross arm 10.

[0038] In other embodiments, the number of the first fixing plate 120 and the number of the second fixing plate 220 may both be one, and a baffle is provided at the end of the first fixing plate 120 away from the first pin hole 122, and the baffle is vertically provided on the side of the first fixing plate 120 close to the second fixing plate 220, so that the first cross arm 11 and the second cross arm 12 can be positioned to the coaxial position of the first cross arm 11 and the second cross arm 12 after changing from the folded state to the unfolded state, and the position can be maintained to facilitate the fixed connection of the first cross arm 11 and the second cross arm 12. Of course, a baffle can also be provided at the end of the second fixing plate 220 away from the second pin hole 222, and the baffle is vertically provided on the side of the second fixing plate 220 close to the first fixing plate 120.

[0039] In another embodiment, the first fixing hole 121 and the second fixing hole 221 are smooth holes, which are locked and fixed by a locking member, which may be a bolt and a nut, or other components that can be locked and fixed, such as a snap-fit ​​structure, etc.; in other embodiments, the first fixing hole 121 and the second fixing hole 221 may also be threaded through holes, which are fixedly connected by fasteners, so that the first crossarm 11 and the second crossarm 12 can continue to maintain this state after being unfolded.

[0040] Furthermore, the first crossarm 11 and the second crossarm 12 both include a crossarm body, an insulating layer and a wire hanging fitting. The cross section of the crossarm body is a solid square, a circle or other formable shapes, and of course it can also be a hollow structure. The crossarm body is made of a composite material, for example, glass fiber or aramid fiber is impregnated with resin and then pultruded. The composite material is corrosion-resistant and low-cost relative to metal, and can reduce the weight of the crossarm. The insulating layer is coated on the crossarm body. The insulating layer is a silicone rubber material with good aging resistance and hydrophobic migration, which can reduce the probability of pollution flashover and rain flashover. Of course, the insulating layer can also be made of other forms of rubber materials. The wire hanging fitting is used to fix the wire. The wire can be fixed to the wire hanging fitting by a bundling process, or a pressure cap can be set to fix the wire. The specific structure of the wire hanging fitting is not limited here. At the same time, the materials of the first root connecting fitting 100, the second root connecting fitting 200 and the wire hanging fitting can all be metal or composite materials, and the metal material can be iron, steel, aluminum and other metals.

[0041] In addition, combined Figure 1-Figure 4The first root connection fitting 100 and the second root connection fitting 200 are both provided with support members on the same side of the insulating cross arm 10. Specifically, the first root connection fitting 100 is provided with a support member 140, and the second root connection fitting 200 is provided with a support member 240, which is used to cooperate with the transmission pole so that the insulating cross arm 10 and the transmission pole can be tightly connected. At the same time, the first root connection fitting 100 and the second root connection fitting 200 are fixedly connected to the transmission pole through the connecting holes 131 and the connecting holes 231 through the pole body fixing member (not shown in the figure). The pole body fixing member is generally a combination of a clamp and a nut. The support member 140 and the support member 240 can be triangular supports, which are suitable for connecting cylindrical or conical transmission poles. Of course, the support member 140 and the support member 240 can also be set to other shapes, as long as they can match the corresponding transmission pole shape, which will not be repeated here.

[0042] The insulating crossarm 10 provided in this embodiment is a combined crossarm of a first crossarm 11 and a second crossarm 12, and is used for supporting the conductors of a double-circuit transmission line, and three insulating crossarms 10 can be installed at the same time; it can also be used for supporting the conductors of a single-circuit transmission line, and one insulating crossarm 10 and an upper crossarm can be installed; it can also be used for supporting the conductors of a transmission line with more circuits, and a corresponding number of insulating crossarms 10 can be installed. The insulating crossarm 10 has a simple structure, is lightweight and high-strength, is corrosion-resistant, aging-resistant, and has good insulation performance, and is suitable for a variety of rods. A first pin hole 122 is set on the first root connecting fitting 100 on the first crossarm 11, and a second pin hole 222 is set on the second root connecting fitting 200 on the second crossarm 12. The first pin hole 122 and the second pin hole 222 are matched with each other, and the first crossarm 11 and the second crossarm 12 are hinged by using the first pin shaft 001. After the hinge, the first crossarm 11 and the second crossarm 12 can rotate relatively freely. Assume that the angle between the first cross arm 11 and the second cross arm 12 is α, and α is less than or equal to 180°. In one embodiment, α=0° during transportation, that is, the first cross arm 11 and the second cross arm 12 are completely folded through the hinge structure, which can reduce the transportation volume, reduce the transportation cost, and facilitate packaging and transportation; when installing on site, the first cross arm 11 and the second cross arm 12 are unfolded so that α=180°, that is, the first cross arm 11 and the second cross arm 12 are fully unfolded. At this time, the first fixing hole 121 and the second fixing hole 221 are matched and fixedly connected through the locking member, so that the first cross arm 11 and the second cross arm 12 are fixedly connected, and the axis of the first cross arm 11 and the axis of the second cross arm 12 are parallel to each other. After unfolding, the insulating cross arm 10 is fixedly connected by the locking member and cannot rotate relatively freely, which is convenient for the fixed connection with the transmission pole and the stable operation of the insulating cross arm 10. At this time, the insulating cross arm 10 can be directly connected to the transmission pole, eliminating the splicing assembly before the installation of the insulating cross arm, making the on-site installation convenient, fast and efficient.

[0043] In some embodiments, after the first cross arm 11 and the second cross arm 12 are unfolded and fixed, the axis of the first cross arm 11 and the axis of the second cross arm 12 are coaxial, that is, during the folding and unfolding process, the axis of the first cross arm 11 and the axis of the second cross arm 12 are located in the same plane, and after being unfolded and fixed, the first cross arm 11 and the second cross arm 12 are symmetrically arranged, and after being fixed to the transmission pole, the insulating cross arm 10 can be arranged horizontally, with balanced force on both sides and good stability. In some other embodiments, after the first cross arm 11 and the second cross arm 12 are unfolded and fixed, the first cross arm 11 can be located above the second cross arm 12 in the vertical plane, and at this time, the axis of the first cross arm 11 and the axis of the second cross arm 12 are parallel to each other. In some other embodiments, after the first cross arm 11 and the second cross arm 12 are unfolded and fixed, they can be arranged at an obtuse angle in the horizontal direction or the vertical direction, as long as the wires can be hung.

[0044] Embodiment 2:

[0045] like Figure 5-Figure 9 As shown, the insulating crossarm 20 of this embodiment has a similar structure to the insulating crossarm 10. The insulating crossarm 20 includes a first crossarm 21, a second crossarm 22 and a top-phase crossarm 23. The first crossarm 21 and the second crossarm 22 are arranged opposite to each other, and the top-phase crossarm 23 is arranged perpendicular to the first crossarm 21. A first root connecting fitting 300 is arranged at one end of the first crossarm 21, a second root connecting fitting 400 is arranged at one end of the second crossarm 22, and a third root connecting fitting 500 is arranged at one end of the top-phase crossarm 23. A first pin hole 322 and a fourth pin hole 332 are arranged at the end of the first root connecting fitting 300 away from the first crossarm 21, a second pin hole 422 is arranged at the end of the second root connecting fitting 400 away from the second crossarm 22, and a third pin hole 522 is arranged at the end of the third root connecting fitting 500 away from the top-phase crossarm 23. After the first pin hole 322 and the second pin hole 422 correspond to each other, the first crossarm 21 and the second crossarm 22 are hinged through the first pin shaft 002. After the third pin hole 522 and the fourth pin hole 332 correspond to each other, the top phase crossarm 23 is hinged to the first crossarm 21 through the second pin shaft 003. Of course, a fourth pin hole (not shown in the figure) can also be set on the second crossarm 22 to vertically hinge the top phase crossarm 23 and the second crossarm 22.

[0046] Specifically, the third root connection fitting 500 includes a body 510 and a third fixing plate 520, the vertical side of the body 510 close to the first cross arm 21 is 511, the third fixing plate 520 is a square flat plate arranged on the side 511, the third fixing plate 520 is provided with a third pin hole 522, and the penetration direction of the third pin hole 522 is perpendicular to the plate surface of the third fixing plate 520. The first root connection fitting 300 includes an upper surface 311, and the fourth pin hole 332 is located on the connection ear 330 on the upper surface 311, and is located at one end of the connection ear 330 close to the top phase cross arm 23, and the penetration direction of the fourth pin hole 332 is perpendicular to the plate surface of the connection ear 330.

[0047] Furthermore, a threaded hole 513 is provided at the end of the third root connecting hardware 500 away from the top phase crossarm 23, and the axis of the threaded hole 513 is located on the axis of the third root connecting hardware 500. The first crossarm 21, the second crossarm 22 and the top phase crossarm 23 are fixedly connected by cooperating with the first fixing hole 321, the second fixing hole 421, the threaded hole 513 and fasteners (not shown in the figure), thereby ensuring that the insulating crossarm 20 can operate stably after being unfolded.

[0048] Furthermore, the main body of the top phase crossarm 23 is consistent with the main body structure and materials of the first crossarm 21 and the second crossarm 22, and the materials of the first root connecting hardware 300, the second root connecting hardware 400 and the third root connecting hardware 500 are also consistent with the materials of the first root connecting hardware 100 in Example 1, which will not be repeated here.

[0049] In addition, if Figure 5 and Fig. 9 As shown, a top phase wire hanging fitting 600 is provided at one end of the top phase cross arm 23 away from the third root connection fitting 500, and the top phase wire hanging fitting 600 includes a connecting portion 610 connected to the body of the top phase cross arm 23 and a winding portion 620 provided on the connecting portion 610, and the diameter of the winding portion 620 is smaller than the diameter of the connecting portion 610, so as to facilitate the binding of the wire. A support platform 630 is provided at one end of the winding portion 620 away from the connecting portion 610, and a wire groove 631 is provided on the support platform 630 for hanging the wire.

[0050] The insulating crossarm 20 provided in this embodiment is arranged in a triangle, that is, a combined crossarm of a first crossarm 21, a second crossarm 22 and a top-phase crossarm 23, and is used for supporting the conductors of a single-circuit power transmission line. Its function is the same as that of the insulating crossarm 10 of the first embodiment, and will not be described in detail here. The top-phase crossarm 23 and the first crossarm 21 after being hinged can rotate relatively freely. It is assumed that the angle between the top-phase crossarm 23 and the first crossarm 21 is β, and β is less than or equal to 90°. In one embodiment, β=0° during transportation, that is, the first crossarm 21 and the top-phase crossarm 23 are completely folded by the hinge structure, which can reduce the transportation volume, reduce transportation costs, and facilitate packaging and transportation; when installing on site, the first crossarm 21 and the top-phase crossarm 23 are unfolded so that β=90°, that is, the first crossarm 21 and the top-phase crossarm 23 are fully unfolded. At this time, the first fixing hole 321, the second fixing hole 421 and the threaded hole 513 are matched correspondingly and fixedly connected through locking members, so that the first crossarm 21, the second fixing hole 421 and the threaded hole 513 are matched correspondingly and fixedly connected through locking members, so that the first crossarm 21, the second crossarm 21 and the top-phase crossarm 23 are completely folded by the hinge structure, so that the first crossarm 21, the second crossarm 21 and the top-phase crossarm 23 are completely folded. The second crossarm 22 is fixedly connected to the top phase crossarm 23, and the axis of the first crossarm 21 and the axis of the second crossarm 22 are parallel to each other, and the axis of the top phase crossarm 23 is perpendicular to the axis of the first crossarm 21. The unfolded insulating crossarm 20 is fixedly connected by a locking piece and cannot rotate relatively freely, which facilitates the fixed connection with the transmission pole and the stable operation of the insulating crossarm 20. At this time, the insulating crossarm 20 can be directly connected to the transmission pole, eliminating the splicing assembly of the insulating crossarm before installation, making on-site installation convenient, fast and efficient.

[0051] Embodiment three:

[0052] like Figure 10-13 As shown, the insulating cross arm 30 of this embodiment is similar in structure to the insulating cross arm 20, except for the folding method between the first cross arm 31, the second cross arm 32 and the top phase cross arm 33. Specifically, a first root connecting fitting 700 is provided at one end of the first cross arm 31, a second root connecting fitting 800 is provided at one end of the second cross arm 32, and a third root connecting fitting 900 is provided at one end of the top phase cross arm 33. A first pin hole 732 is provided at the end of the first root connecting fitting 700 away from the first cross arm 31, a second pin hole 832 is provided at the end of the second root connecting fitting 800 away from the second cross arm 32, and a third pin hole 932 and a fourth pin hole 942 are provided at the end of the third root connecting fitting 900 away from the top phase cross arm 33, and the third pin hole 932 is close to the first cross arm 31, and the fourth pin hole 942 is close to the second cross arm 32. After the first pin hole 732 and the third pin hole 932 are matched with each other, the top phase cross arm 33 is hinged to the first cross arm 31 through the first pin shaft 004, and after the second pin hole 832 and the fourth pin hole 942 are matched with each other, the top phase cross arm 33 is hinged to the second cross arm 32 through the second pin shaft 005.

[0053] Furthermore, if Fig.11As shown, the first root connection fitting 700 includes a body 710, a first fixing plate 720, a connection ear 730 and a connection ear 740. The first fixing plate 720 is a square flat plate, located at the end of the first root connection fitting 700 away from the first cross arm 31, the plate surface of the first fixing plate 720 is vertically arranged, and a first fixing hole 721 is arranged on the first fixing plate 720, the through direction of the first fixing hole 721 is perpendicular to the plate surface of the first fixing plate 720, and the center of the first fixing hole 721 is located in the horizontal plane where the axis of the first cross arm 31 is located. The main body 710 includes an upper surface 711 and a lower surface 712 which are arranged opposite to each other. The connecting ear 730 and the connecting ear 740 are square flat plates which are symmetrically arranged on the upper surface 711 and the lower surface 712 respectively. The plate surfaces of the connecting ear 730 and the connecting ear 740 are both arranged vertically. A connecting hole 731 is provided on the connecting ear 730, and a connecting hole 741 is provided on the connecting ear 740. The penetration direction of the connecting hole 731 is perpendicular to the plate surface of the connecting ear 730, and the penetration direction of the connecting hole 741 is perpendicular to the plate surface of the connecting ear 740. A first pin hole 732 is also provided on the connecting ear 730. The first pin hole 732 is arranged away from the first cross arm 31, and the penetration direction of the first pin hole 732 is perpendicular to the plate surface of the connecting ear 730.

[0054] like Fig.12 As shown, the second root connection fitting 800 has a similar structure to the first root connection fitting 700, and specifically includes a body 810, a second fixing plate 820, a connecting ear 830, and a connecting ear 840. The second fixing plate 820 is a square flat plate, located at the end of the second root connection fitting 800 away from the second cross arm 32, and the plate surface of the second fixing plate 820 is vertically arranged, and a second fixing hole 821 is arranged on the second fixing plate 820, the through direction of the second fixing hole 821 is perpendicular to the plate surface of the second fixing plate 820, and the center of the second fixing hole 821 is located in the horizontal plane where the axis of the second cross arm 32 is located. The main body 810 includes an upper surface 811 and a lower surface 812 that are relatively arranged. The connecting ear 830 and the connecting ear 840 are square flat plates, which are symmetrically arranged on the upper surface 811 and the lower surface 812 respectively. The plate surfaces of the connecting ear 830 and the connecting ear 840 are both vertically arranged. A connecting hole 831 is provided on the connecting ear 830, and a connecting hole 841 is provided on the connecting ear 840. The penetration direction of the connecting hole 831 is perpendicular to the plate surface of the connecting ear 830, and the penetration direction of the connecting hole 841 is perpendicular to the plate surface of the connecting ear 840. A second pin hole 832 is also provided on the connecting ear 830. The second pin hole 832 is arranged away from the second cross arm 32, and the penetration direction of the second pin hole 832 is perpendicular to the plate surface of the connecting ear 830.

[0055] like Fig.13As shown, the third root connection fitting 900 includes a body 910, a third fixing plate 920, a connection ear 930 and a connection ear 940. The third fixing plate 920 is a square flat plate, located at the end of the third root connection fitting 900 away from the top phase cross arm 33, the plate surface of the third fixing plate 920 is vertically arranged, and a third fixing hole 921 is arranged on the third fixing plate 920, the through direction of the third fixing hole 921 is perpendicular to the plate surface of the third fixing plate 920, and the center of the third fixing hole 921 is located in a plane perpendicular to the axis of the top phase cross arm 33. The main body 910 includes a side surface 911 and a side surface 912 that are arranged opposite to each other. The connecting ears 930 and the connecting ears 940 of two square flat plates are symmetrically arranged on the side surface 911 and the side surface 912 respectively. The plate surfaces of the connecting ears 930 and the connecting ears 940 are both arranged vertically. A third pin hole 932 is provided on the connecting ear 930, and a fourth pin hole 942 is provided on the connecting ear 940. The penetration direction of the third pin hole 932 is perpendicular to the plate surface of the connecting ear 930, and the penetration direction of the fourth pin hole 942 is perpendicular to the plate surface of the connecting ear 940.

[0056] After the first pin hole 732 and the third pin hole 932 are matched, the top phase cross arm 33 is hinged to the first cross arm 31 through the first pin shaft 004, so that the top phase cross arm 33 and the first cross arm 31 can rotate relatively freely; after the second pin hole 832 and the fourth pin hole 942 are matched, the top phase cross arm 33 and the second cross arm 32 are hinged through the second pin shaft 005, so that the top phase cross arm 33 and the second cross arm 32 can rotate relatively freely. The number of the first fixing plate 720, the second fixing plate 820 and the third fixing plate 920 is one, and the third fixing plate 920 is inserted between the first fixing plate 720 and the second fixing plate 820, and the first cross arm 31, the second cross arm 32 and the top phase cross arm 33 are firmly connected through the locking member.

[0057] The insulating cross arm 30 provided in this embodiment is arranged in a triangle, that is, a combined cross arm of the first cross arm 31, the second cross arm 32 and the top phase cross arm 33, and is used for supporting the conductor of a single-circuit power transmission line. Its function is the same as that of the insulating cross arm 20 of the second embodiment, and will not be repeated here. The top phase cross arm 33 and the first cross arm 31 and the second cross arm 32 after articulation can all rotate relatively freely. Assume that the angle between the top phase cross arm 33 and the first cross arm 31 is β, and the angle between the top phase cross arm 33 and the second cross arm 32 is γ, and the sum of β and γ is less than or equal to 180°. In one embodiment, during transportation, β=γ=0°, that is, the top phase cross arm 33 and the first cross arm 31 and the second cross arm 32 are completely folded through the hinge structure, which can reduce the transportation volume, reduce the transportation cost, and facilitate packaging and transportation; when arriving at the site for installation, the first cross arm 31, the second cross arm 32 and the top phase cross arm 33 are unfolded so that β=γ=90°, that is, the first cross arm 31, the second cross arm 32 and the top phase cross arm 33 are fully unfolded, and at this time, the first fixing hole 721, the second fixing hole 821 and the third fixing hole 921 are matched and connected. The first crossarm 31, the second crossarm 32 and the top phase crossarm 33 are fixedly connected by locking members, and the axis of the first crossarm 31 and the axis of the second crossarm 32 are parallel to each other, and the axis of the top phase crossarm 33 is perpendicular to the axis of the first crossarm 31. The unfolded insulating crossarm 30 cannot rotate relatively freely, which facilitates the fixed connection with the transmission pole and the stable operation of the insulating crossarm 30. At this time, the insulating crossarm 30 can be directly connected to the transmission pole, eliminating the splicing assembly of the insulating crossarm before installation, making on-site installation convenient, fast and efficient.

[0058] Embodiment 4:

[0059] The present embodiment provides a transmission pole, comprising a pole body and the insulating cross arm of the above-mentioned embodiments 1-3 fixed on the pole body. The insulating cross arm is a combined cross arm, which can be folded by hinged means during transportation, thereby reducing the transportation volume, reducing the transportation cost, and facilitating packaging and transportation. During on-site installation, it is only necessary to unfold and fix the insulating cross arm, and fix it to the transmission pole through the pole body fixing piece, thereby eliminating the need for splicing and assembling the insulating cross arm before installation, making on-site installation convenient, fast and efficient.

[0060] The technical content and technical features of the present invention have been disclosed above, but it is understood that under the creative ideas of the present invention, those skilled in the art can make various changes and improvements to the above structures and materials, including combinations of technical features disclosed or claimed separately herein, and obviously including other combinations of these features. These variations and / or combinations all fall within the technical field involved in the present invention and fall within the protection scope of the claims of the present invention.

Claims

1. An insulating cross arm, characterized in that: It comprises a first cross arm and a second cross arm which are arranged opposite to each other, wherein a first root connecting fitting is arranged at one end of the first cross arm, and a second root connecting fitting is arranged at one end of the second cross arm, a first pin hole is arranged at an end of the first root connecting fitting away from the first cross arm, and a second pin hole is arranged at an end of the second root connecting fitting away from the second cross arm, and the first pin hole and the second pin hole are correspondingly matched to hinge the first cross arm and the second cross arm through a first pin shaft; The insulating cross arm further comprises a top phase cross arm vertically arranged with the first cross arm, a third root connecting hardware is arranged at one end of the top phase cross arm, a third pin hole is arranged at the end of the third root connecting hardware away from the top phase cross arm, a fourth pin hole is arranged on the first cross arm, and the top phase cross arm is hinged to the first cross arm through a second pin shaft after the third pin hole and the fourth pin hole are matched; A first fixing plate is disposed at an end of the first root connecting fitting away from the first cross arm, and a second fixing plate is disposed at an end of the second root connecting fitting away from the second cross arm. A first fixing hole is disposed on the first fixing plate, and a second fixing hole is disposed on the second fixing plate. The first fixing hole and the second fixing hole are matched with each other and are fixedly connected through a locking member, so that the first cross arm is fixedly connected to the second cross arm and the axis of the first cross arm and the axis of the second cross arm are located in the same plane; A threaded hole is provided at the end of the third root connecting hardware away from the top phase cross arm, and the top phase cross arm is fixedly connected with the first cross arm and the second cross arm through the threaded hole and fasteners.

2. The insulating cross arm according to claim 1, characterized in that: The first fixing plate and the second fixing plate are both L-shaped, the center of the first fixing hole is located in the vertical or horizontal plane where the axis of the first cross arm is located, the line formed by the center of the first pin hole and the center of the first fixing hole is perpendicular to the axis of the first cross arm, the center of the second fixing hole is located in the vertical or horizontal plane where the axis of the second cross arm is located, and the line formed by the center of the second pin hole and the center of the second fixing hole is perpendicular to the axis of the second cross arm.

3. The insulating cross arm according to claim 1, characterized in that: The number of the first fixing plate and the number of the second fixing plate are both one, and a baffle is provided at an end of the first fixing plate away from the first pin hole, and the baffle is vertically arranged on a side of the first fixing plate close to the second fixing plate.

4. The insulating cross arm according to claim 1, characterized in that: The number of the first fixing plates and the number of the second fixing plates are both two, the two first fixing plates and the two second fixing plates are arranged in parallel, and at least one first fixing plate is inserted between the two second fixing plates.

5. The insulating cross arm according to claim 1, characterized in that: A top phase hanging wire fitting is provided at the other end of the top phase cross arm, and the top phase hanging wire fitting comprises a connecting portion connected to the main body of the top phase cross arm and a winding portion provided on the connecting portion, wherein the diameter of the winding portion is smaller than the diameter of the connecting portion.

6. The insulating cross arm according to claim 5, characterized in that: A support platform is arranged at one end of the winding portion away from the connecting portion, and a wire groove is arranged on the support platform.

7. A transmission pole, comprising a pole body and an insulating cross arm fixed to the pole body, characterized in that: The insulating cross arm adopts the insulating cross arm as described in any one of claims 1-6.

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