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At present, the combined structure of socket and plug used for the power connection of 24V ABS anti-lock braking system of trailer and semi-trailer has the following defects: after the plug and socket are plugged in, it is easy to loosen in the working environment where the vehicle vibrates violently, resulting in failure. The inner surface of the hinged socket cover on the socket is in contact with the plug shell, which is easy to wear and damage the hinged structure under vibration environment. Summary of the Invention The utility model provides a 24-volt plug-and-socket combination of a trailer ABS system, aiming at solving the shortcomings of the prior art, and provides a 24-volt plug-and-socket combination of a trailer ABS system which is firmly combined, difficult to damage and convenient to maintain. The technical scheme adopted by the utility model to solve the technical problem is that a 24V plug and socket combination of trailer ABS system comprises a socket and a plug which are plugged together, wherein the socket consists of a socket shell, a socket cover hinged at the top of the socket shell, a plug component arranged in the socket shell, an induction fastener arranged at the bottom of the socket shell and a cable socket, and the plug consists of a plug shell, a jack component arranged in the plug shell and a plug rod connected with the jack component. The bolt assembly is inserted into the bolt hole assembly, and is characterized by having two housings, wherein the two housings are locked on the end faces of the bolt housings by screws, the two housings contain the bolt rods, and the lower end faces press the stepped end faces of the bolt rods; A fixed hook is hinged on the plug shell, and the fixed hook hooks the bolt post arranged on the socket shell; The side surface of the plug shell is provided with a side disk, and the inner surface of the socket cover abuts against the side disk. The technical scheme has the advantages that the bolt rod is tightly fixed by two shells, and the two shells are screwed on the plug shell, accommodated outside the bolt rod and kept connected with the jack assembly, so that the installation and maintenance are convenient; The fixing hook on the plug shell hooks the stud on the socket shell, so that the plug shell and the socket shell are more firmly connected together and are not easy to loosen in the working environment with severe vibration; The inner surface of the socket cover abuts against the side plate to provide stable support for the socket cover, so that the socket cover and its hinged structure with the socket shell are not easy to be damaged in the vibration environment.