Southwest Petroleum University

Meishan Crrc Brake Science & Technology Co., Ltd.

Chengdu Hairui Energy Technology Co., Ltd

Qin Wang

Chao Lv

Yi Liu

Lian Chen

Hong An

Weiyuan Xiao

Chen Xiao

Jianhong Shen

Kaien Wang

Zhiming Shi

Yuchun Kuang

Junying Zhang

Liang Lv

Yunxiao Shi

Fuying Mao

Xueli Wei

Xia Du

Qiong Quan

Guo Li

A fixed cutting structure-composite cone drill bit includes a drill bit body, a fixed cutting structure, and at least one cone. The cone and the fixed cutting structure are disposed on the drill bit body. The cone is rotatably connected to the drill bit body by means of a bearing structure. The distance from the outermost tooth or back cone of the at least one cone to the front side surface of the fixed cutting structure La&#x2264;&#x3c0;R/3, and the distance from the outermost tooth or back cone of the at least one cone to the rear side surface of the fixed cutting structure Lb&#x2264;&#x3c0;R/3. In the composite drill bit, the distance from the cone to the front/rear side surface of the fixed cutting structure is short, the gap between the cone and the fixed cutting structure is small, transition between cutting structure is smooth.

Fixed cutting structure-composite cone drill bit

A brake cylinder dust cover is installed on a waterproof brake cylinder. The brake cylinder includes a brake cylinder body and a front cover. A waterproof dust cover assembly is arranged on the front cover. The waterproof dust cover assembly includes a dust cover fixedly connected to the front cover, and a filter felt support and a filter felt pad which are arranged in the dust cover. The filter felt support is connected with the dust cover, and the filter felt pad is fixed on the filter felt support. An outwards extending skirt is arranged at the edge of the dust cover in the axial direction thereof.

Brake cylinder dust cover and waterproof brake cylinder using such dust cover

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Sichuan, China

Qin Wang