Clamp facilitating feeding and discharging

The clamp comprises a base, a through groove is formed in the middle of the top of the base in a penetrating mode, a first limiting assembly is installed in the through groove in a sliding mode, a second installation frame is fixedly installed at the bottom of the base, and an air cylinder is fixedly installed in the middle of the top of the second installation frame. The moving end of the air cylinder is fixedly connected with the first limiting assembly, a second limiting assembly and a guiding assembly are fixedly installed at the two ends of the top of the base correspondingly, connecting rods are movably installed between the second limiting assembly and the guiding assembly jointly, and second clamping blocks are fixedly installed on the corresponding side faces of the two connecting rods correspondingly. Through cooperative use of the first limiting assembly, the second mounting frame, the air cylinder and the second limiting assembly, when the device is used, a proper limiting mode can be selected acc