The testing principle is point-load method,having the advantage of high efficiency,be quick,economic,reliable,time-saving and easy to operate.

Analysis of flow rate and polished rod load for hydraulic feedback hollow sucker rod pump;

Effect of centralizer on polished rod load for polymer flooding artificial lift wells;

Mathematical simulation for calculation chart of polished rod load in beam pumping unit

Discussion on adaptability of point load test of rocks;

In order that irregular rock pieces could be used at the site to test the point load strength of rockthe laboratory and the in-situ contrastive testing and analysis are conducted.

The writers put forward a new method: collecting some fresh irregular rock piece from the rock bed, the height, length and width of which are accoring accordance with certiai certain regulation, testing them on a point load apparatus at the workplace directly, and processing the data to find the point load strengh of ro.

By solving load-constant,this paper presents equivalent nodal load of several applied-loads on parabolic wedge-shaped beam with rectangular section in cross-beam structures.

Breaking characters of coal-rock under point load press;