Patent ID: 9604396
Date: 2017-03-28
CPC Classifications: B29C

Claim:
1. A mold clamping device for an automatic mold opening and closing machine being applied to a mold mounting unit and used to clamp or release an upper mold which has a pair of wings, the mold clamping device comprising: two pressure cylinder units located at two lateral surfaces of the mold mounting unit and each including a cylinder fixed to the lateral surfaces, two protrusions formed on the cylinder, and a piston inserted in the cylinder and movable between a first position and a second position, wherein each of the pistons includes a rod portion exposed out of the cylinder; two pivot units pivoted to the two pressure cylinder units, respectively, and each including two swing members, wherein each of the swing members is provided with a first pivot portion pivoted to a corresponding one of the protrusions, and a second pivot portion; and two clamping members pivotally disposed between the pressure cylinder units and the pivot units, and each including an outer portion pivoted to the rod portion of a corresponding one of the pistons, an inner portion for clamping or releasing the wings of the upper mold, and a middle portion located between the inner and outer portions and pivoted to the second pivot portion of a corresponding one of the swing members; wherein the clamping members are driven to rotate an angle to disengage the inner portions with the wings of the upper mold when the pistons are moved to the first positions, and the clamping members are driven to rotate an angle in a reverse direction when the pistons are moved to the second positions, so that the wings of the upper mold are clamped by the inner portions and the bottom surface of the mold mounting unit respectively.