Through modification of the framework of a beam pumping unit by removing the cross tension link, a great quantity of steel can be saved and the manufacturing cost can be reduced.
采取去掉横拉筋的办法改造抽油机游梁支架，可节省大量钢材，降低制造成本。对改造后的游梁支架进行了动态应力测试、位移测试和稳定性计算。
Under the cushions can buy toilet paper volumes, do not have to move back or bottom mattresses, can be used at any time pumping, can effectively prevent cross-infection at the clinic.
座垫底下可置卫生纸卷，不必移动背板或底部床垫，即可随时抽用，能有效防止门诊时的交互感染。
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