Resin pelletizer apparatus and abnormality determination method for resin pelletizer apparatus

• US 10,661,463 B2
• Filed: 05/16/2017
• Issued: 05/26/2020
• Est. Priority Date: 06/10/2016
• Status: Active Grant

• Current Assignee: Klaus Schmidt
• Original Assignee: Kobe Steel Limited
• Inventors: Takahashi, Eiji, Tabuse, Ryo, Araki, Kaname, Manabe, Chitaka, Iwasaki, Shin, Miyamoto, Tatsuru
• Primary Examiner(s): Zhao, Xiao S
• Assistant Examiner(s): Leyson, Joseph S
• Application Number:
  US16/098,957
• Publication Number:
  US 20190184590A1
• Time in Patent Office: 1,106 Days
• CPC Class Codes: B26D 1/28 and rotating continuously in one direction during cutting
• CPC Class Codes: B26D 5/00 Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
• CPC Class Codes: B26D 5/26 wherein control means on the work feed means renders the cutting member operative
• CPC Class Codes: B29B 9/06 in the form of filamentary material, e.g. combined with extrusion
• CPC Class Codes: B29B 9/065 under-water, e.g. underwater pelletizers
• CPC Class Codes: G01M 13/028 Acoustic or vibration analysis
• CPC Class Codes: G01M 15/12 by monitoring vibrations

Abstract

A resin pelletizer apparatus (100) is provided with: a die (6) that has a die surface (61) having a die hole (63) formed therein; a rotary blade (21) that cuts a resin extruded from the die hole (63) into a pellet shape in water when being rotated on the die surface (61) in the water; a sensor (150) that detects elastic waves generated by the rotary blade (21) during the rotation on the die surface (61); and a determination unit (121) that monitors the output value of the sensor (150) and determines that an abnormality has occurred when the output value of the sensor (150) is outside a predetermined range (R).

Claims

1. A resin pelletizer apparatus comprising:

a die that has a die surface having a die hole formed therein;

a rotary blade that cuts a resin extruded from the die hole into a pellet shape in water when being rotated on the die surface in the water;

a sensor that detects elastic waves generated by the rotary blade during rotation on the die surface;

a determination unit that monitors an output value of the sensor and determines that an abnormality has occurred when the output value of the sensor is outside a predetermined range;

a rotation shaft that drives the rotary blade; and

a plurality of the sensors that are disposed to be spaced apart from each other,

wherein the determination unit determines that the rotation shaft is tilted when, among the plurality of the sensors, the output values of a part of the sensors are above an upper limit value of the predetermined range and the output values of a rest of the sensors are below a lower limit value of the predetermined range.

2. The resin pelletizer apparatus according to claim 1, wherein the determination unit determines that a contact surface pressure between the rotary blade and the die surface is too large when the output value of the sensor is above an upper limit value of the predetermined range.

3. The resin pelletizer apparatus according to claim 1, wherein the determination unit determines that an abrasion of at least one of the rotary blade and the die surface is in progress when the output value of the sensor is below a lower limit value of the predetermined range.

4. The resin pelletizer apparatus according to claim 1, wherein the determination unit determines that a cavitation has occurred when both of a case in which the output value of the sensor is above an upper limit value of the predetermined range and a case in which the output value of the sensor is below a lower limit value of the predetermined range have occurred within a predetermined period of time.

5. A resin pelletizer apparatus comprising:

a die that has a die surface having a die hole formed therein;

a rotary blade that cuts a resin extruded from the die hole into a pellet shape in water when being rotated on the die surface in the water;

a sensor that detects elastic waves generated by the rotary blade during rotation on the die surface;

a determination unit that monitors an output value of the sensor and determines that an abnormality has occurred when the output value of the sensor is outside a predetermined range;

a rotation shaft that drives the rotary blade; and

a plurality of the sensors that are disposed to be spaced apart from each other, wherein

the determination unit determines that a contact surface pressure between the rotary blade and the die surface is too large when the output values of the plurality of the sensors are each above an upper limit value of the predetermined range,

the determination unit determines that an abrasion of at least one of the rotary blade and the die surface is in progress when the output values of the plurality of the sensors are each below a lower limit value of the predetermined range,

the determination unit determines that a cavitation has occurred when both of a case in which the output values of the plurality of the sensors are each above the upper limit value of the predetermined range and a case in which the output values of the plurality of the sensors are each below the lower limit value of the predetermined range have occurred within a predetermined period of time, and

the determination unit determines that the rotation shaft is tilted when, among the plurality of the sensors, the output values of a part of the sensors are above the upper limit value of the predetermined range and the output values of a rest of the sensors are below the lower limit value of the predetermined range.