The utility model relates to a fixed bolt hydraulic pretightening device which is composed of an oil cylinder and a piston. The cylinder is arranged in the center of the threaded hole and pre tightening bolt matching, an annular groove at the lower end of the external screw hole, is provided with an oil cavity at the bottom of the groove is arranged on the upper part of the oil cylinder, the oil chamber and on both sides of the oil inlet and exhaust holes; the piston is a barrel type structure with step type through hole, the barrel wall into the annular groove and the upper cylinder the match, the seal between the ring groove of the inner wall, the top is provided with a sealing ring, the lower side is provided with screw thread is provided with a lock nut. The invention has the advantages of simple structure, small size, convenient operation and no disassembly, and is especially suitable for occasions with compact mechanical structure and small operating space.
【技术实现步骤摘要】
本专利技术涉及一种固定式螺栓液压预紧装置,属于螺栓液压预紧装置制造领域。
技术介绍
对于直径大于1英寸的螺栓,应用普通手动扭矩扳手是很难将其预紧,必须借助 一种专用螺栓液压预紧装置来将其预紧,如专利号为CN97234407. 1 “螺栓液压上紧装置”、ZL201020173692. 7 “组合式螺栓液压上紧装 置”、ZL201020216976. X “复位式螺栓液压拉伸器”、ZL201020216973. 6 “强密封螺栓液压拉 伸器”、ZL201020216978. 9 “双油缸螺栓液压拉伸器”、ZL201020216954. 3 “液压上紧装置”均属于这一类。这类螺栓液压上紧装置均为拆卸式,即将螺栓预紧后,要将其从预紧螺栓上 卸下。其需带支撑圈,存在结构复杂,装卸操作繁琐费力,工作效率低,对在使用中预紧螺栓 预紧力的校正调节不方便等缺点。
技术实现思路
为克服现有拆卸式螺栓液压预紧装置所存在的不足,本专利技术提供一种固定式螺栓 液压预紧装置,由油缸和活塞组成,其特征在于油缸中心设有与预紧螺栓相配的螺纹孔, 在螺纹孔下端外部设有环形槽,在槽底设有油腔;所述活塞 ...
【技术保护点】
1.一种固定式螺栓液压预紧装置,由油缸和活塞组成,其特征在于:油缸中心设有与预紧螺栓相配的螺纹孔,在螺纹孔下端外部设有环形槽,在槽底设有油腔;所述活塞为设有台阶型通孔的桶型结构,桶壁上部伸进与其相配的油缸环形槽内,与环形槽内壁之间设有密封圈,其顶部装有密封环,桶壁下部外侧设有螺纹,螺纹上装有锁紧螺母。
【技术特征摘要】
【专利技术属性】
技术研发人员:耿晓曦,陈进海,
申请(专利权)人:江苏拓盛重工机械有限公司,
类型:发明
国别省市:32
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