1. China's spring washer performance standard GB/T 94.1
( 1 ) Hardness: 42 to 50HRC .
(2) Flexibility: The steel spring washer flattened after three consecutive loaded, free height measurement, should not be less than the nominal 1.67 S.
( 3 ) Resilience: The steel spring washer is clamped on the bench vise, and it must not be broken when twisted 90o .
2. German spring washer performance standard DIN267 T26
( 1 ) Hardness: 430 ~ 530HV .
( 2 ) Permanent deformation test: After pressing the steel spring washer for 2 min , measure the free height, which should not be less than DIN267 T26 .
( 3 ) Permanent load test: 10 spring washers are separated by 10 flat washers and placed on the test bar. After pressing for 48 hours , the washers must not be broken.
( 4 ) Torsion test: The steel spring washer is clamped on the bench vise and twisted 90 o must not be broken. Continue loading until twisted and the section should be smooth.
( 5 ) Elastic test: After pressing the steel spring washer for 2 min , loosen 20 Î¼m and the residual elastic force shall comply with the provisions of DIN 267 T26 .
3. American Spring Washer Performance Standard ASME B18.21.1
( 1 ) Hardness: 38 ~ 46HRC .
( 2 ) Elastic test: After flattening the steel spring washer, measure the free height, which should be no less than 2/3 of the original height .
( 3 ) Torsion test: The steel spring washer is clamped on the bench vise and twisted 90 o must not be broken.
4. British spring washer performance standard BS 1802
( 1 ) Hardness: 42 to 50HRC .
( 2 ) Elasticity: Apply a load to the steel spring washer so that it is completely flattened. After carrying tea to release free height measurements should not be less than 1.66S nominal. The load is then applied and released 20 times in succession and its free height should not be further reduced.
In addition, for plated spring washers, hydrogen flooding should be performed immediately after plating. After the plating, the gasket should be flattened for more than 48 hours to observe whether there is brittle fracture.
Each winch has 2 separate brake systems, a disc brake on the transmission input (service brake) and a disc brake directly on the drum (parking brake). The position of the cable drum is determined by means of an absolute encoder and checked by a gear limit switch with 4 switching elements. For a precise measurement of the tensile force, a measuring system with 2 load cells is available. Due to the special suspension of the winch frame, only the tensile force is transmitted to the load cells. The sum of the two measured forces gives the pulling force on the rope. The torque determined by the inverter checks this measuring system. The measured tensile force is primarily used to control the automatic cycle. When unwinding, the system is also used to leave a certain minimum pulling force on the ropes.
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Jinzhou Jinshi Mining Equipment Technology Co., Ltd. , https://www.jsminingeqpt.com