RU39341U1 - DEVICE FOR REGULATING THE MILLING PROCESS IN A DISK MILL - Google Patents

Abstract

The utility model relates to pulp and paper production and can be used to regulate the grinding process in continuous grinding machines, such as disk mills. The device includes a mass flow sensor (1), a vibration transducer (2), a division unit (3), a comparison unit (4), a power sensor of the main electric motor (5), a setter (6), an electric motor (7), an additive mechanism (8)

Description

The device for controlling the grinding process in a disk mill.

The utility model relates to pulp and paper production and can be used to regulate the grinding process in continuous grinding machines, such as disk mills.

A known method of regulating the grinding process in grinding machines is that they measure the specific pressure acting on the grinding headset, compare it with the given parameters, and then carry out the rotor addition.

When implementing the known method, the static specific pressure between the grinding sets is measured, which depends on the difference in mass pressure at the inlet and outlet of the mill.

This does not take into account the pressure pulses that occur during the operation of the mill when crossing the knives of the rotor sets and the stator

A device for controlling the process of grinding paper pulp described in utility model No. 14584 (IPC D 21 B 1/14, 02 C 7/00) is a prototype. A device for controlling the process of grinding paper pulp in a disk mill, consisting of a vibrating transducer mounted on a stator of a disk mill, a driving signal supply unit, an additive unit, a signal comparing unit from a vibration converter and a driving signal supply unit, characterized in that it further comprises a device for measuring the flow rate of feedstock and a division unit.

The technical task is to reduce energy consumption during grinding.

The task is achieved by means of an electric motor power sensor and a comparison unit that control the operation of the electric motor, in such a way as to maintain a constant ratio of the level of vibration acceleration of the stator and the mass flow through the mill with minimal energy consumption.

The method is regulated as follows.

During the operation of the mill, the stator vibration is measured using a vibration transducer, it is converted into an electrical signal, and the consumption of the semi-finished product is also measured. The control is carried out with a constant ratio of the rms vibration acceleration of the stator and the flow rate of the mill with a minimum power consumption.

The mean square value of the vibration acceleration of the mill stator headset depends on the installation location of the vibration transducer and the type of mill, and ranges from one to several thousand ms. The installation location of the vibration transducer is determined specifically for each mill by removing and analyzing the vibration field of the stator structure. Subsequently, for specific mills and types of headsets, the installation location of the vibration transducer does not change, and the system is calibrated while the vibration transducer remains at the same position.

To determine the increase in the qualitative characteristics of the grinding mass by the level of vibration on the stator, it is necessary to calibrate, since the relationship between these indicators is determined by many factors: the type of grinding mass and the qualitative characteristics of the mass at the mill inlet, the material, the condition and relative position of the grinding sets, type of mill and the place of installation of the vibration transducer, mill design, mass flow rate and headset pattern.

The drawing shows a diagram of the proposed device.

The device includes a mass flow sensor (1), a vibration transducer (2), a division unit (3), a comparison unit (4), a power sensor of the main electric motor (5), a setter (6), an electric motor (7), an additive mechanism (8) works as follows.

When the rotor knives cross over the stator knives, pressure pulses occur that act on the semi-finished product, causing it to grind, and on the headset of the rotor and stator, causing it to vibrate. Vibration transducer (2) converts it into an electrical signal, and the mass flow sensor (1) converts the consumption of the semi-finished product also into an electrical signal. Further, the electrical signals from the sensors enter the division unit (3), where the quotient of the vibration acceleration level at the mill flow rate is determined. The signal from the division unit is fed to the comparison unit (4), which also receives the signal from the power sensor of the main electric motor (5) and from the master (6). From the master, the signal goes to the additive mechanism (8) and to the main electric motor (7). The operation of the mill is controlled by maintaining a constant ratio of the level of vibration acceleration of the stator to the consumption of the semi-finished product with a minimum power of the main electric motor.

Claims (1)

A device for controlling the grinding process in a disk mill, consisting of a vibrating transducer mounted on a stator, a driving signal supply unit, an additive mechanism, a flow sensor, a signal comparison unit from the sensors and a division unit, characterized in that it further comprises a main power sensor an electric motor, the output of which is connected to the input of the comparison unit.