Oil injection valve for tensioning device

The utility model discloses an oil injection valve for a tensioning device. The device comprises a valve body, an oil injection nozzle, an overflow valve I, an overflow valve II, a one-way valve and avalve body joint, the check valve is characterized in that the valve body is provided with an oil inlet channel and an oil outlet channel; wherein the one-way valve is arranged between the oil inletchannel and the oil outlet channel to ensure that grease can only flow from the oil inlet channel to the oil outlet channel, the oil injection nozzle is connected with the oil inlet channel, the valvebody joint is connected with the oil outlet channel, the overflow valve I is connected with the oil inlet channel, and the overflow valve II is connected with the oil outlet channel. The oil injection valve is provided with the overflow valve, the problem that the tensioning degree of the caterpillar band is inaccurate during oil injection is solved, meanwhile, the pressure of the grease cylindercan be reduced in time when