Traction pin is one of the key parts connecting the tractor and the semi-trailer in the semi-trailer train. There are two types of traction pin in the national standard: no. 50 and 90. The two types of traction pins are also available in sizes 50 and 90. The traction pin is mounted on the semi-trailer and the traction seat is mounted on the traction vehicle. Each tractor can only have one type of traction seat, and the semi-trailer can only have one type of traction pin. In the transportation or production process of ports, logistics parks and semi-trailer manufacturers, semi-trailers need to be scheduled frequently in different places, and the tractor equipped with no. 50 and no. 90 traction seats should be prepared at any time to match the semi-trailers with different types of traction pins. Is common on the market situation is need to make sure when tractor semi-trailer semi-trailer traction pin model, and then dispatch to match the tractor, because of the existence and uniqueness of traction and traction pin matching, so need to frequent replacement of tractor, and in the process of shunting is also inevitable there will be a tractor traction and chaos of the semi-trailer traction pin matching problem, work efficiency correspondingly. Therefore, the emergence of traction pin conversion device technology has solved this problem.

The principle of traction pin conversion device: the tractor with no. 50 traction seat passes the conversion device of traction pin, which can satisfy both the semi-trailer with no. 90 traction pin and the semi-trailer with no. 50 traction pin.

The specific design of the conversion device: it is composed of two semi-cylindrical sleeves, which are axisymmetrically fastened on the traction pin of no. 50 semi-trailer and fixed in the clamping groove with a fine iron wire with a diameter of 3 mm, so as to quickly realize the conversion from no. 50 to no. 90 traction pin. The installation and disassembly is simple, convenient and fast, which not only improves the universality of the tractor, but also improves the working efficiency.

The daily operation of half-train is calculated at 600 km and 10 hours, with a gross profit of 1,000 yuan per day. Traditionally, from no. 50 a traction changing into 90, do not calculate the cost of the traction seat itself, only the replacement of man-hour costs and losses caused by the replacement of take up the shipping time, consumption of about 4 hours each time, amounted to 200 yuan, delay the operating margins of 400 yuan, and using traction pin conversion device, without having to replace the traction seats, only 15 min, can save cost 580 yuan, calculated on replacement of 100 times a year, can save 58000 yuan, more fully make use of social resources, the social benefit is remarkable