Connecting device for protective cover

The utility model provides a connecting device for a protective cover, which is characterized in that a grease pump comprises a wave-shaped grease tank body, a protective cover, a pump body and a base, the protective cover covers the wave-shaped grease tank body, a groove is arranged on the bottom surface of the protective cover, the base is arranged on the pump body, and a base hole channel is arranged on the base. A bouncing assembly matched with the groove in the bottom face of the protective cover to achieve positioning and locking is arranged in the base hole channel and comprises a steel ball seat, a steel ball and a spring, the steel ball seat is installed in the base hole channel in an interference fit mode, a bouncing channel is formed in the center of the steel ball seat, the steel ball is arranged in the bouncing channel, and the spring is arranged between the steel ball and the inner bottom face of the base hole channel in an abutting mode. The bouncing channel is provided with a diameter smaller