Pneumatic adjustment cutter rod structure of underwater granulator

Abstract

The invention discloses a pneumatic adjustment cutter rod structure of an underwater granulator. The structure comprises a cutter rod assembly, a connecting flange and a pneumatic adjustment structure; a bearing base of the cutter rod assembly is connected with a water cavity of the underwater granulator through the connecting flange; the back end of a cutter rod is mounted in the bearing base, and is connected with an output shaft of an alternating-current motor; the middle part of the cutter rod penetrates through the connecting flange; a front end oil seal and a back end oil seal are arranged between the connecting flange and the cutter rod at intervals; an intake port is formed between the front end oil seal and the back end oil seal, and is connected with an air source of compressed air through the pneumatic adjustment structure; an intake hole is formed in the cutter rod opposite to the intake port; the front end of the cutter rod extends into the water cavity; a plunger slide hole is formed in the front end of the cutter rod, and communicates with the intake hole through a ventilation hole; a pneumatic plunger is arranged in the plunger slide hole, and is connected with a cutter base through a compression spring; the cutter base is provided with a cutter head shaft; and the cutter head shaft is connected with a cutter disc. The structure can guarantee tightness between acutter and a hot-cut mold surface, improves the granulation quality, and reduces wear of the cutter.

Description

technical field [0001] The invention relates to a pneumatically adjustable knife rod structure of an underwater granulator. Background technique [0002] The underwater pelletizer can perfectly cut and process a variety of polymer materials with various particle sizes. When multiple cutters are under appropriate pressure, the blades of each cutter are closely attached to the surface of the hot cutting die, and are driven by the cutter rod. The bottom slides along the surface of the hot-cutting die to cut the polymer material extruded from the hot-cutting head into spherical or olive-shaped particles. . [0003] At present, there are three types of close-fit structures that use multiple cutters and hot-cutting die surfaces at home and abroad: [0004] 1. The cutter disc is driven by the elastic force of the compression spring to ensure that the blades of multiple cutters on the cutter disc are closely attached to the hot cutting die surface at the same time to ensure the pe...

AI Technical Summary

Problems solved by technology

[0004] 1. The cutter disc is driven by the elastic force of the compression spring to ensure that the blades of multiple cutters on the cutter disc are closely attached to the hot cutting die surface at the same time to ensure the pelletizing effect. The disadvantage is that the elastic force of the compression spring cannot Material properties are adjusted, especially when cutting soft polymer materials, which will cause particle tailing and more debris;

[0005] 2. The piston in the cylinder is driven by the compressed air, and the knife rod is pushed by the piston, and the knife rod withstands the cutting disc to ensure that the blades of multiple cutters on the cutting disc are closely attached to the surface of the hot-cutting die at the same time to ensure granulation The disadvantage is that under the thrust of compressed air, the blades of the multiple cutters on the cutter disc are hard and close to the surface of the hot-cutting die, and the blades of the cutters are easily worn, which increases the production cost;

[0006] 3. By adjusting the screw rod to push the knife rod, the underwater granulator runs for a period of time, when the blade of the cutter is worn out, in order to ensure that the blades of multiple cutters on the cutter disc are closely attached to the hot cutting die surface at the same time , by manually adjusting the screw rod to ensure the pelletizing effect, the disadvantage is that under the hard pressing force of the screw rod, the blade of the cutter is easy to wear, and in addition, due to the need for frequent manual adjustment of the screw rod during operation, manpower is increased

[0007] For the above three structures, mechanical seals are used for the sealing of the cutting knife and the hot-cutting die surface, which is complicated in structure and not conducive to maintenance.

In addition, due to the complex working conditions of the underwater pelletizer, it is easy to cause damage to the friction end face of the mechanical seal and cause water leakage, which increases the maintenance cost

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