高效回转式泵站拦污清污机研制

为提高拦污清污设备的可靠性和清污效率,对齿耙牵引链条采用滚轮凸轨行走方式和限位装置,避免脱轨,提高齿耙左右定位精度;在此基础上,优化栅条、耙齿和齿耙管断面形状,实现耙齿、齿耙与栅条精确紧密配合,减少栅条污物粘附与卡堵,切断拖拽的水草,避免清污初期由于栅前过多的水草造成耙齿和齿耙过载损坏;单孔较宽的拦污栅采用2～3片分体结构拦污栅架,便于栅体吊装检修和更换;采用侧边导污板和底部弧形前置栅,提高侧边和底部污物清污效率。应用结果表明,回转式拦污清污机通过结构改进,提高了运行可靠性和拦污清污效率,降低了设备故障率和维护成本,减小了拦污栅前后水位差,提高了泵站运行可靠性和效率,运行维护费用节省9%以上,清污效率提高30%以上,拦污栅体前后平均水位差由60 cm减小到10 cm以下,泵站运行费用减小8%左右。

Development of rotary sewage interceptor and cleaning machine with high efficiency in pumping station

In the past decades, China had rapid economic development accompanied by a large number of garbage production, eventually most of them converge in various rivers. In order to protect the normal operation of the pumping station, it is required that the trash rack of the pumping station can be cleaned in time. Due to the structural defects, the conventional rotary sewage interceptor and cleaning machine has low waste clean efficiency, high leakage rate of the waste and high failure rate of equipment, which affects the normal operation of the sewage interception and cleaning equipment and pumping station units. In order to improve the reliability and efficiency of the cleaning equipment, the structure of the conventional rotary sewage interceptor and cleaning machine is improved and optimized. The walking mode of the roller convex rail and the limit device are advanced on the rack traction chain to avoid the derailment of the chain and improve the positioning accuracy of the rack. On this basis, the rack bar section is changed from rectangle to diamond arrow type, and the rack teeth are changed from triangle to plate type. The plate tooth surface is supported by a triangular stiffened plate, and the tooth harrow pipe is changed from a circular pipe to a rectangular one, which enhances the load-carrying capacity of the single harrow tooth and the bending strength of the tooth harrow. It has been realized that the harrow teeth, the tooth harrow and the rack are precisely matched with each other, the adhesive blockage of the rack is reduced, the overload of harrow tooth and harrow pipe is avoided by cutting off the dragging weeds in front of the rack in the initial cleaning stage, and the broken accidents of harrow tooth and harrow tube are avoided, also. 2-3 pieces of split structure trash rack are used in the wide single-hole trash rack to facilitate the lifting, maintenance and replacement of the grid. Side dirt guide plates and bottom arc front rack are used to clean the trash accumulating at the pier beam and bottom of the rack and improve the trash-cleaning efficiency at the sides and bottom. The application results show that through structure improvement, the operation reliability and the trash-cleaning efficiency of the rotary sewage interceptor and cleaning machine has been improved, the equipment failure rate and maintenance cost has been reduced, the water level difference before and after the trash rack has been reduced also, and therefore, the operation reliability and the efficiency of the pump station have been improved. Compared with the conventional rotary sewage interceptor and cleaning machine, the improved rotary sewage interceptor and cleaning machine has higher reliability, increases the cleaning efficiency by more than 30%, reduces the average water level difference before and after the trash interception grid from 60 cm to less than 10 cm, and reduces the operation cost of the pumping station by about 184 thousand yuan.