Composite crossarm and power transmission tower

A composite crossarm, comprising:

• at least two post insulators and at least two suspension insulators, wherein the at least two post insulators and the at least two suspension insulators have first ends configured to be connected to a tower body of a power transmission tower, and second ends connected together to form an end portion of the composite crossarm to hang a power transmission line, wherein the at least two suspension insulators are located on a same side of the at least two post insulators and respectively arranged adjacent to the at least two post insulators;
• and
• an angle between the at least two post insulators ranges from 20° to 50°, and an angle between one of the post insulators and one of the suspension insulators adjacent thereto ranges from 15° to 45°;
• wherein each of the post insulators includes an insulating body and a shed cladding a periphery of the insulating body, the insulating body is a solid insulating core, or the insulating body is a hollow insulating tube, an insulating gas is sealed in the hollow insulating tube, and an absolute pressure value of the insulating gas ranges from 0.1 MPa to 0.15 MPa;
• wherein each post insulator further includes two first link fittings, each of first and second ends of the post insulator is connected to a respective first link fitting to mount the post insulator, and each first link fitting includes:
• a flange cylinder arranged in a hollow structure along an axial direction and sleeving an end portion of the insulating body;
• a flange plate capping one end of the flange cylinder away from the insulating body;
• a first connecting plate, in an axial direction of the post insulator, the first connecting plate extending outwards from one side of the flange plate away from the flange cylinder, and in a radial direction of the post insulator, the first connecting plate extending to two opposite sides of the flange cylinder to be connected to the flange cylinder;
• and
• a second connecting plate having a side edge abutting against a plate surface of the first connecting plate and extending from the first connecting plate to an outer peripheral surface of the flange cylinder, so that a mountable space is formed between the first connecting plate and the second connecting plate;
• wherein the two first connecting plates on the first and second ends of the post insulator are not arranged in parallel;
• wherein an inner wall of the flange cylinder is provided with a plurality of binding grooves spaced along the axial direction and a flow groove communicated with the plurality of binding grooves, wherein the binding grooves and the flow groove are filled with an adhesive to fixedly connect the flange cylinder and the insulating body;
• wherein a plate surface of the flange plate facing the insulating body is provided with a first sealing groove facing an end surface of the insulating body, the first sealing groove being internally provided with a first sealing member;
• and the inner wall of the flange cylinder is provided with a second sealing groove adjacent to the flange plate, the second sealing groove and the plurality of binding grooves are sequentially spaced in a direction away from the flange plate, and the second sealing groove is internally provided with a second sealing member;
• wherein a width of the first sealing groove and/or the second sealing groove remains constant or gradually decreases in a direction close to the insulating body.