Simple harmonic type circumferential vibration mechanism with adjustable frequency and amplitude

The utility model discloses a simple harmonic type circumferential vibration mechanism with adjustable frequency and amplitude, which can convert single rotation of a motor into simple harmonic type rotation, adjust the simple harmonic type rotation frequency by changing the rotation speed of the motor, and change the included angle between a first connecting rod and a second connecting rod by changing the extension length of a push rod of a linear driving piece. Therefore, the stroke of the second U-shaped connecting piece sliding in the arc-shaped sliding groove of the arc-shaped piece during rotation is changed, then the swing amplitude of the first U-shaped connecting piece is changed, and finally the amplitude of simple harmonic rotation of the rotating shaft is changed. The simple harmonic rotation generated in the utility model is helpful for the sampling pipe to go deep into the soil for sampling, and meanwhile, the damage to the original soil layer structure of the soil can be reduced, or the resista