The invention relates to an expansion clasping hydraulic mould
locking mechanism, which comprises a pull rod pressing plate, a pull rod nut, a pull rod pressing plate screw, a pull rod, a mould moving oil cylinder, a fixed template, a mould, a movable template, an expansion clasping oil cylinder pull rod, a guide sleeve, an expansion supporting seat, a supporting body, a pull screw, an expansion oblique block, a compression spring, an expansion clasping oil cylinder rear cover, an expansion clasping oil cylinder
piston rod, an expansion clasping oil cylinder body, an expansion clasping oil cylinder
front cover, a high-pressure mould locking oil cylinder
piston rod, a high-pressure mould locking oil cylinder rear cover, a high-pressure mould locking oil cylinder body, a high-pressure mould locking oil cylinder pull rod and a high-pressure mould locking oil cylinder
front cover. The mechanism ensures that huge clasping force is generated between an inner ring of the expansion oblique block and the pull rod through hydraulic thrust according to an oblique surface principle, an expansion clasping oil cylinder generates
high pressure to clasp the pull rod, and a high-pressure mould locking oil cylinder generates
high pressure to generate mould locking force, so that the mould is locked quickly, accurately and reliably.