Servo control device and method for disc gap in disc powder grinding system

Patent metadata

Field	Value
Publication number	US-2020101468-A1
Application number	US-201816318594-A
Country	US
Kind code	A1
Filing date	Dec 13, 2018
Priority date	Sep 30, 2018
Publication date	Apr 2, 2020
Grant date	—

Abstract

Provided is a disc gap servo control device and method for a powder grinding system, which includes a disc powder grinding machine, a rotating speed regulating device of a rotating disc, the disc gap servo control device and a control cabinet. The method includes the following steps of: (1) inputting a control information; (2) an industrial computer obtaining a current disc gap and displaying the disc gap on a touch screen; (3) the disc gap servo control device adjusting the disc gap; (4) the current disc gap reaches a target disc gap; and (5) a frequency converter controlling a motor rotating speed, so that the actual rotating disc rotating speed can reach a target rotating speed of the rotating disc. The operation parameters of the rotating disc are observed by the industrial computer in real time, and finally a high-precision servo control of the disc gap can be realized.

First claim

What is claimed is:

1 . A disc gap servo control device for a disc powder grinding system, the disc powder grinding system comprising a disc powder grinding machine, a rotating speed regulating device of a rotating disc, the disc gap servo control device and a control cabinet, wherein the control cabinet comprises a touch screen, an industrial computer and a programmable controller;
the touch screen is connected with the industrial computer, and a control information is input to the industrial computer through the touch screen; the industrial computer is connected with the programmable controller, and a working state of the disc gap servo control device is controlled by the programmable controller; the industrial computer is separately connected with the rotating speed regulating device of the rotating disc and the disc gap servo control device and receives a working state information of the disc gap servo control device, and the working state information is displayed on the touch screen; the programmable controller is separately connected with and controls the rotating speed regulating device of the rotating disc and the disc gap servo control device; a feed opening and a discharge opening are disposed in a grinding chamber of the disc powder grinding machine, and the rotating disc and a static disc are arranged in the grinding chamber, wherein a center of the rotating disc is fixedly connected with a rotating shaft; the static disc is fixed inside the grinding chamber; the rotating shaft is connected with the rotating speed regulating device of the rotating disc; the rotating speed regulating device of the rotating disc comprises a driving motor; the rotating speed regulating device of the rotating disc forms a transmission connection with the rotating shaft through a conveyor belt, and drives the rotating disc through the rotating shaft to provide power for the disc powder grinding machine: the disc gap servo control device comprises an AC servo motor, a transmission device and a displacement sensor; the transmission device comprises a decelerator and a mechanical linkage, wherein the mechanical linkage is connected with the rotating shaft; one end of the decelerator is connected to the AC servo motor, and the other end of the decelerator is connected to the mechanical linkage; the decelerator is used for converting the power of the AC servo motor into the power that drives the mechanical linkage to move horizontally, so as to control a spacing between the rotating disc and the static disc; the position sensor is mounted on the mechanical linkage of the disc powder grinding machine, a position signal of the rotating disc is collected in real time with a position movement of the mechanical linkage, and the position signal is fed back to the control cabinet; the disc powder grinding machine is a double-disc powder grinding machine; and the diameters of the static disc and the rotating disc, the specification of the driving motor, and the rotating speed of the rotating disc are determined according to the actual production efficiency and material hardness.

2 . The disc gap servo control device for the disc powder grinding system of claim 1 , wherein the diameters of the static disc and the rotating disc are 500 mm.

3 . The disc gap servo control device for the disc powder grinding system of claim 1 , wherein the driving motor is a three-phase asynchronous motor, of which the power is 3 kW and the rotating speed is 0-3000 r/min.

4 . The disc gap servo control device for the disc powder grinding system of claim 1 , wherein the power of the AC servo motor is 1 kW.

5 . The disc gap servo control device for the disc powder grinding system of claim 1 , wherein the rotating speed regulating device of the rotating disc further comprises a frequency converter; and
the frequency converter is separately connected with the driving motor and the programmable controller of the control cabinet, wherein the programmable controller controls the frequency converter according to a control command of the industrial computer, so as to control the rotating speed of the driving motor.

6 . A control method for a disc gap servo control device for a disc powder grinding system, which adopts the disc gap servo control device for the disc powder grinding system of claim 1 , the method comprising the following steps:
step 1, inputting a control information to the industrial computer through the touch screen, wherein the control information comprises a target rotating disc rotating speed and a target disc gap; step 2, transmitting a position information to the industrial computer through the position sensor, so that the industrial computer obtains a current disc gap accordingly and displays the disc gap on the touch screen; step 3, using the industrial computer to generate a control command according to a difference value between the current disc gap and the target disc gap and control the disc gap servo control device to adjust a disc spacing, which specifically comprises the following steps that: step 3.1, the industrial computer generates the control command according to the difference value between the current disc gap and the target disc gap, and controls the servo motor to rotate accordingly; and step 3.2, the servo motor is decelerated by the decelerator, drives the mechanical linkage, and further drives the rotating shaft and the rotating disc to move horizontally for a certain distance, so as to realize precise control of the disc spacing; step 4, repeating the steps 2-3 until the current disc gap reaches the target disc gap, then going to the next step; and step 5, controlling the rotating speed of the driving motor by the industrial computer through the frequency converter according to the target rotating disc rotating speed, and further controlling the rotating disc rotating speed, so that the actual rotating disc rotating speed can reach the target rotating disc rotating speed.

Assignees

• Univ Northeastern

Inventors

• Zhou Ping
• Li Mingjie
• Wang Hong
• Chai Tianyou

Classifications

• B02C7/16

  Driving mechanisms · CPC title

• D21D1/30

  Disc mills · CPC title

• B02C7/14 Primary

  Adjusting, applying pressure to, or controlling distance between, discs · CPC title