The invention relates to an excavator arm, in order to solve the problem that the rear support and the lower support of the existing upper arm are liable to crack and lead to the reliability decline when they are subjected to huge loads, it provides an upper arm, which is mainly a box-shaped structure formed by welding the upper wing plate, the lower wing plate, the left web plate and the right web plate, and has a front support welded at the front end of the box-shaped structure, and an upper support welded on the upper wing plate, and also includes the following. The hinged support is welded at the opening of the back end of the box structure. The hinged support is formed by casting. The hinged hole of the lower arm and the hinged hole of the upper arm cylinder are arranged on the hinged support. At the same time, the front part of the hinged support is welded with the upper wing plate, the lower wing plate, the left web plate and the back end of the box structure. In the present invention, the articulated holes used for articulating the lower arm and the upper arm cylinder are arranged on the articulated support formed in one casting body, there is no weld between the two articulated holes, and there is no risk of weld cracking under load, and the weld between the articulated support and the box structure is simple and regular, so the welding quality can be easily controlled.
【技术实现步骤摘要】
上动臂和双节动臂及挖掘机
本专利技术涉及一种动臂,更具体地说,涉及一种上动臂和双节动臂及挖掘机。
技术介绍
挖掘机中有一种双节动臂挖掘机,在这种挖掘机中,动臂由两节动臂构成。双节动臂分别为下动臂和上动臂,下动臂的下端铰接于挖掘机回转平台,并在下动臂与回转平台之间连接有推动下动臂绕铰接点转动的下动臂油缸。上动臂的后端与下动臂的上端铰接,上动臂与下动臂之间设置有上动臂油缸推动上动臂油缸绕下动臂上端铰接点转动,上动臂的前端与斗杆铰接。现有的上动臂为箱型结构,其主要由左右腹板、上翼板和下翼板焊接而成,在箱型结构的后端设置有后支座,用于与下动臂上端铰接,箱型结构后部的下侧设置有下支座,用于与上动臂油缸连接。箱型结构的前端设置有前支座用于与斗杆铰接,箱型结构的上侧设置有上支座用于与斗杆油缸铰接。在现有的结构中,下支座通常是有铰接耳板焊接在下翼板上,后支座通常为单铰接孔的铸件或铰接圆筒,后支座与箱型结构的上下翼板和左右腹板相焊接。在现有的技术中,后支座与下支座是各自通过焊接方式固定在上动臂箱型结构上的两个部件,而后支座与下支座上承受的载荷巨大,在下支座与后支座上之间具有众多焊缝且焊缝不规整,在巨大的载荷作用下,这些焊缝处容易出现应力集中的情形而使得焊缝开裂的风险提升,从而降低了上动臂的可靠性。
技术实现思路
本专利技术要解决的技术问题是针对现有上动臂后支座与下支座在承受巨大载荷时容易出现开裂而导致可靠性下降,而提供一种上动臂和双节动臂及挖掘机,简化上动臂后部的结构,减少焊缝,降低上动臂后部焊缝开裂的可能性而提高上动臂的可靠性。本专利技术为实现其目的的技术方案是这样的:提供一 ...
【技术保护点】
1.一种上动臂,主要由上翼板、下翼板和左腹板、右腹板焊接而成后端开口的箱型结构,在箱型结构的前端焊接有前支座,上翼板上焊接有上支座,其特征在于还包括焊接在所述箱型结构后端开口处的铰接支座,所述铰接支座为铸造一体成型,其上设置有下动臂铰接孔和上动臂油缸铰接孔,所述铰接支座的前部同时与所述箱型结构的上翼板、下翼板、左腹板和有腹板的后端相焊接。
【技术特征摘要】
1.一种上动臂,主要由上翼板、下翼板和左腹板、右腹板焊接而成后端开口的箱型结构,在箱型结构的前端焊接有前支座,上翼板上焊接有上支座,其特征在于还包括焊接在所述箱型结构后端开口处的铰接支座,所述铰接支座为铸造一体成型,其上设置有下动臂铰接孔和上动臂油缸铰接孔,所述铰接支座的前部同时与所述箱型结构的上翼板、下翼板、左腹板和有腹板的后端相焊接。2.根据权利要求1所述的上动臂,其特征在于所述铰接支座的前部呈矩形,其每一边的外侧均具有台阶结构,每个台阶结构的两个平面分别构成与箱型结构内壁贴合的搭接面和与箱型结构侧壁后端面对接相焊的坡口。3.根据权...
【专利技术属性】
技术研发人员:李志军,孙天帅,邵荣刚,
申请(专利权)人:柳州柳工挖掘机有限公司,柳工常州机械有限公司,广西柳工机械股份有限公司,
类型:发明
国别省市:广西,45
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