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以在钢筋冷弯性能检测采用燕尾装配式压头（图！），实践证明，这种燕尾装配式弯曲压头，在大直径钢筋弯曲检测时，检测动力，工作效率低。对不同规格钢筋的试验，还要换用不同规格的弯曲压头，劳动强度大且易出现挤碰等安全事故。为此我们研制了一种钢套式组合弯曲压头，它可
In order to test the cold bending performance of steel bars, dovetail assembly type indenters have been used (Figures!). Practice has proved that this kind of dovetail assembly type bending indenters can detect the power and work efficiency when large-diameter steel bars are bent. As for the tests of different specifications of steel bars, they must also be replaced with different specifications of bending heads, which are labor-intensive and prone to collision and other safety accidents. For this purpose we have developed a steel sleeve combined bending head which can be