Patent ID: 7717305

Claim:
An extrusion apparatus for high viscosity liquid, said extrusion apparatus comprising a gun body ( 2 ), a retainer ( 1 ) fixedly connected to the gun body ( 2 ), a push rod ( 3 ) slidably running through the gun body ( 2 ), a wrench ( 5 ) hinged to the gun body ( 2 ) and a handle ( 24 ) connected to the gun body ( 2 ), wherein a push block ( 6 ) is hinged to one end of the wrench ( 5 ) adjacent to the push rod ( 3 ), an outer end face of a hinge end of the push block ( 6 ) is an arc-shaped face or an inclined face, the outer end face of the hinge end of the push block ( 6 ) is movable to contact with the gun body, and the two contact surfaces are matched with each other, the push rod ( 3 ) has a rod body ( 33 ) provided with several teeth ( 331 ) on a side facing the push block ( 6 ), an anti-back mechanism ( 4 ) is set between the gun body ( 2 ) and the rod body ( 33 ) for restricting reverse movement of the rod body ( 33 ), the anti-back mechanism ( 4 ) is set within an anti-back hole ( 44 ) in the gun body ( 2 ), said anti-back mechanism comprises a steel ball ( 43 ), a spring ( 42 ) and a plug ( 41 ), the spring ( 42 ) is placed between the steel ball ( 43 ) and the plug ( 41 ), the steel ball ( 43 ) is pressed against the teeth ( 331 ) on the rod body ( 33 ), and the plug ( 41 ) is threadedly connected to the gun body ( 2 ), a push tooth is provided on the push block ( 6 ), a permanent magnet is placed on the push block ( 6 ) or the push rod ( 3 ), and the push tooth is movable to snap to the teeth ( 331 ) under action of the magnetic force of the permanent magnet.