Cordless roller shutter spring regulator

A cordless roller shutter spring regulator, comprising a roller shutter spring pre-tightening force adjustment mechanism and a self-locking mechanism, wherein the roller shutter spring pre-tightening force adjustment mechanism comprises an adjustment shaft and a pipe sleeve, one end of the adjustment shaft extends into the pipe sleeve, the other end of the adjustment shaft is provided with an adjustment wheel, and a through hole is provided on a wheel surface of the adjustment wheel;

• wherein the self-locking mechanism is used to lock the adjustment shaft on the roller shutter spring pre-tightening force adjustment mechanism before an installation weight is installed;
• after the installation weight is installed, the self-locking mechanism unlocks the adjustment shaft on the roller shutter spring pre-tightening force adjustment mechanism under a top pressure of the installation weight;
• wherein the self-locking mechanism comprises a pressing spring, a self-locking ring and a fixing ring, an end face of the self-locking ring being provided with a top pressure transmission rod and a ring of ratchet teeth A, the top pressure transmission rod being surrounded by the ring of ratchet teeth A, an end face of the fixing ring being provided with a ring of ratchet teeth B, the fixing ring being fixed on an end of the pipe sleeve via a screw, the adjustment shaft passing through the fixing ring, the pressing spring and the self-locking ring being sheathed on the adjustment shaft, the pressing spring pressing the self-locking ring against an end face of the fixing ring, so that the ratchet teeth A engage with the ratchet teeth B, the ratchet teeth A are able to slide relatively to the ratchet teeth B in one direction, one end of the top pressure transmission rod protrudes out of the pipe sleeve via the through hole on the adjustment wheel, and after the installation weight is installed, a plate surface of the installation weight pushes the top pressure transmission rod forward, and the top pressure transmission rod pushes the self-locking ring forward, so that the ratchet teeth A are disengaged from the ratchet teeth B and are unlocked.