13B coupler and coupler tail frame are new-type couplers designed and improved by Qi Equipment Company on the basis of 13A coupler and coupler tail frame in order to meet the needs of further development of railway transportation in China and solve the train separation accident caused by bolt fracture of coupler tail pin. In 2007, the Equipment Department of the Transportation Bureau of the Ministry of Railways approved the 13B coupler and coupler tail frame in the document No.370 of Freight Cars (2007), passed the ministerial technical examination, and began to be widely used in the repair of new 60t freight cars and freight cars.
13B coupler body On the basis of 13A coupler body, the process hole at the coupler tail is cancelled to increase the bearing area of coupler tail pin and improve the stress state of coupler tail pin. Other coupler parts, such as coupler pusher, lock iron, lower lock pin and coupler pin, all adopt 13A coupler parts, which will not change the product performance; The hook material is improved from C-grade steel to E-grade steel, which further improves the strength of the hook.
13B coupler tongue modified the structure of coupler tongue cavity, increased the number of reinforcing ribs from 2 to 3, and increased the thickness of reinforcing ribs, further improving the structural strength and fatigue reliability of coupler tongue. The requirements of no draft angle on the S-plane of traction and parting along the lock surface of the seat are increased, and the draft angle on the lock surface is specified, which improves the stress concentration state on the S-plane of the hook tongue. 13B coupler tongue is made of C-grade steel and E-grade steel, which can meet the needs of new construction and maintenance of freight cars.