Mould-clamping oil cylinder device

Abstract

The invention belongs to the technical field of high-pressure mould-clamping equipment, and particularly discloses a mould-clamping oil cylinder device, which comprises a piston rod and a piston, wherein the piston is connected with the piston rod, the outer circumferential wall, near the upper end surface and the lower end surface, of the piston is respectively provided with a first guide ring and a second guide ring, the middle part of the outer circumferential wall of the piston is provided with a first sealing ring, the outer circumferential wall, near the lower end surface, of the piston rod is provided with a third guide ring, the middle part of the outer circumferential wall of the piston rod is provided with a second sealing ring, and the cross sections of the first guide ring, the second guide ring and the third guide ring are respectively in a concave shape. By adopting the structure, a buffer space with a larger angle is generated when a deflection angle is formed between the piston and a cylinder barrel, so easiness in scratching of the cylinder barrel is avoided, and easiness in oil leakage is also avoided.

Description

technical field [0001] The invention belongs to the technical field of high-pressure mold clamping equipment, and in particular relates to a mold clamping oil cylinder device. Background technique [0002] The clamping cylinder device is a mechanism for providing high-pressure clamping of the vertical two-platen extrusion molding machine. like figure 1 As shown, when the mold 6 is clamped under high pressure, the moving beam 1 and the fixed beam 2 are clamped on both sides of the mold 6, one end of the tie rod 3 penetrates the fixed beam 2 and is locked together with the clamping cylinder 5, and the tie rod 3 The other end runs through the moving beam 1 and is screwed together with the clutch nut 4. Once the high-pressure oil is injected into the clamping cylinder 5, one end of the tie rod 3 can be moved to the outside of the fixed beam 2, and then the moving beam 1 is pulled closer to the fixed beam 2. , to achieve the purpose of tightly locking the mold 6. [0003] like...

AI Technical Summary

Problems solved by technology

[0008] like figure 1 and 2 As shown, in the process of the movable beam 1 and the fixed beam 2 extruding the mold 6, the force on the fixed beam 2 will produce a slight bending in the direction shown by the dotted line in the figure, and then drive the front end cover 51, cylinder barrel 52, and the connecting cover 56 deflect together, but the piston rod 53, the piston 54, and the main nut 55 are fixed on the pull rod 3 and will not deflect together with the fixed beam 2, which will cause an angle to be formed between the piston 54 and the cylinder barrel 52. Now Due to the small gap between the piston 54 and the cylinder barrel 52 and the small gap between the piston rod 53 and the front end cover 51 in some oil cylinder structures, the seal of the mold clamping cylinder is often damaged. What is more serious is that when the fixed beam deforms greatly, the piston The gap between 54 and the cylinder 52 will no longer exist, so the inner wall of the cylinder 52 will be strained, resulting in failure of the clamping cylinder

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