机械化程度较低的铸造车间大多采用带式松砂机进行松砂。这种松砂机的突出缺点为;①由于两滚筒在运行过程中难以保证平行精度和滚筒表面上容易进入砂子,致使松砂胶带常常跑偏。②松砂胶带易损坏,寿命短,每松制700～1000m~3型砂,就要更换一次胶带,每年更换胶带需花费三千多元。③结构复杂,检修不 Most of the foundries with lower mechanization use loose belt sanding machines for loose sand. Outstanding shortcomings of this loose sand machine; ① As the two rollers in the course of the operation is difficult to ensure the parallel accuracy and easy access to the surface of the drum sand, resulting in loose sliver tape often deviation. ② loose sand tape easily damaged, short life expectancy, each loose system 700 ~ 1000m ~ 3 sand, it is necessary to replace the tape, tape replacement each year to spend more than 3,000 yuan. ③ complex structure, maintenance is not