Process tension pulley torsion spring

The present invention relates to an automobile using the belt tensioner idler pulley torsion spring process. Solve the drawbacks of the prior art springs can not improve the processing efficiency of the inspection, high labor intensity of selection; coil springs; straight end of the torsion spring is bent; heat; imaging test; surface treatment; final inspection; packing; made after the coil spring imaging test, the test is more convenient, eliminating the need for angle measurement, diameter measurement, more intuitive test structure, the test efficiency can be improved, while improving the yield and accuracy of the torsion spring.