The utility model discloses a roller bit which can realize the sealing and non sealing conversion, including a roller and a roller, the roller is connected with the roller through the journal, the inner hole port of the roller is provided with a bearing sealing ring, and the bearing sealing ring and the journal are matched to form a bearing cavity; the roller is provided with a valve cavity, and the valve cavity is connected with the bearing cavity through the oil hole; the valve cavity is provided with a conversion valve, and the conversion valve includes a valve body The upper end of the valve body is provided with a baffle plate, and the baffle plate and the lower end of the valve body are provided with through holes; the upper end and the lower end of the valve body are staggered with a number of through holes; the inner cavity of the valve body is provided with a slide valve which can move to the lower end of the valve body under the gas pressure; the slide valve is in the I-shaped shape, which is composed of the upper end slide plate and the lower end slide plate connected by a connecting rod; when the slide valve is located at the upper end of the inner cavity of the valve body, the upper end Several vent holes of are located above the lower slide plate of the slide valve. The roller bit of the utility model can realize the full sealing of the bearing cavity in the working process, so as to avoid the water and impurities entering the bearing cavity.
【技术实现步骤摘要】
一种能实现密封非密封转换的牙轮钻头
本技术属于油气井工程及矿山开采
,尤其涉及一种能实现密封非密封转换的牙轮钻头。
技术介绍
牙轮钻头是使用最广泛的一种钻井钻头,其工作时切削齿交替接触井底,切削齿与井底接触面积小,比压高,易于吃入地层;其工作刃总长度大,因而相对减少磨损。牙轮钻头能够适应从软到坚硬的多种地层。目前,为了提高矿用牙轮钻头的使用寿命,需要对牙轮钻头的轴承进行润滑,要保持良好的润滑,则要避免水分和杂质进入轴承内腔,造成油品的变质。为避免水分和杂质进入轴承内腔,有密封性矿用牙轮钻头,但其实际为半密封结构的牙轮钻头。出于环保需要及改善钻机操作人员的工作环境,矿山开采中,为了防尘,习惯在钻孔过程中加水除尘。而且,开采过程中经常遇到地下水造成水孔。正是这些状态,水通过注油管进入轴承内腔,造成润滑油变质,影响轴承润滑,加速轴承的磨损和发热,造成轴承密封圈8的快速失效,减少牙轮钻头使用寿命。有数据显示,相对理论寿命,牙轮钻头的实际寿命减少了30%。
技术实现思路
本技术的目的是提供一种能实现密封非 ...
【技术保护点】
1.一种能实现密封非密封转换的牙轮钻头,包括牙掌(1)和牙轮(2),所述牙掌(1)通过轴颈(3)与所述牙轮(2)相连,牙轮(2)内孔端口设置有轴承密封圈(4),轴承密封圈(4)与轴颈(3)相配合形成轴承腔;其特征是:/n所述牙掌(1)上设置有阀腔,阀腔通过油孔(5)与轴承腔导通;/n阀腔内置有转换阀,所述转换阀包括阀体(6),阀体(6)上端口设有挡板(7),挡板(7)及阀体(6)下端均开设有通孔;阀体(6)上端部和下端部均交错分布若干通气孔(10);/n阀体(6)内腔设有可在气体压力下向阀体(6)下端移动的滑阀(8),挡板(7)用来对滑阀(8)进行限位;所述滑阀(8)呈工字 ...
【技术特征摘要】
1.一种能实现密封非密封转换的牙轮钻头,包括牙掌(1)和牙轮(2),所述牙掌(1)通过轴颈(3)与所述牙轮(2)相连,牙轮(2)内孔端口设置有轴承密封圈(4),轴承密封圈(4)与轴颈(3)相配合形成轴承腔;其特征是:
所述牙掌(1)上设置有阀腔,阀腔通过油孔(5)与轴承腔导通;
阀腔内置有转换阀,所述转换阀包括阀体(6),阀体(6)上端口设有挡板(7),挡板(7)及阀体(6)下端均开设有通孔;阀体(6)上端部和下端部均交错分布若干通气孔(10);
阀体(6)内腔设有可在气体压力下向阀体(6)下端移动的滑阀(8),挡板(7)用来对滑阀(...
【专利技术属性】
技术研发人员:沈劲松,汪学军,汪杨志,胡敏,
申请(专利权)人:湖北鸣利来冶金机械股份有限公司,
类型:新型
国别省市:湖北;42
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