Adjustable door closer with buffering and damping functions

The adjustable door closer with the buffering and damping functions comprises an installation base, a rotating shaft, an outer connecting rod, an inner connecting rod, a guide rail and a sliding block, an installation plate is installed at the front end of the installation base, the rotating shaft is installed in the installation base and penetrates through the top of the installation base, and the top of the rotating shaft is fixedly connected with the left end of the outer connecting rod. The inner connecting rod is inserted into the right side of the outer connecting rod and is in threaded connection with the outer connecting rod, the locking nut is arranged on the inner connecting rod, the guide rail is arranged in front of the outer connecting rod, the sliding block is arranged in the guide rail, and the connecting boss is fixedly arranged at the rear end of the sliding block and is rotationally connected with the right end of the inner connecting rod. Compared with the prior art, the door closer has the