Patent ID: 8206142

Claim:
A hydraulic locking mechanism for multiple extrusion heads of an extruder, comprising: two Y-shaped clamping arms ( 1 ), each having three arms; six wedges ( 2 ); six pushing bars ( 3 ), each having a front end and a slant ( 10 ) on an outer side of said front end; six oil cylinder brackets ( 4 ); six oil cylinders ( 5 ); six piston rods; six locking holes ( 6 ), each having an inner wall; a barrel ( 7 ), an extrusion head ( 8 ), six through holes ( 9 ); and six branches each defined by one of said arms of each of said two Y-shaped clamping arms; wherein said Y-shaped clamping arms ( 1 ) are symmetrically disposed on both sides of said barrel ( 7 ) and said extrusion head ( 8 ) via fastening devices; is respectively formed on both sides of said barrel ( 7 ) and both sides of an upper portion and a lower portion of said extrusion head ( 8 ) said six oil cylinders ( 5 ) are fixed each on one of said six branches via said six oil cylinder brackets ( 4 ), respectively; said through holes ( 9 ) are disposed each in one of said branches, and are disposed each at an opening of one of said oil cylinders ( 5 ); each of said locking holes ( 6 ) is formed on both sides of an upper portion and a lower portion of said barrel ( 7 ) and said extrusion head ( 8 ), and said locking holes ( 6 ) and adjacent each to one of said through holes ( 9 ); said wedges ( 2 ) are disposed each on the inner wall of one of said locking holes ( 6 ), and each of said wedges ( 2 ) has a sectional area gradually decreasing in a direction away from said locking holes ( 6 ); said piston rods are disposed each within one of said six oil cylinders ( 5 ); and said pushing bars ( 3 ) are penetrably disposed each in one of said through holes ( 9 ) and are connected each at a rear end thereof to one of said piston rods, whereby when said pushing bars ( 3 ) are driven by said oil cylinders ( 5 ) to move along said through holes ( 9 ), said front ends are inserted into said locking holes ( 6 ).