JPH0445904A - Control device for fine grinding by mill - Google Patents

Abstract

PURPOSE:To manufacture slurry ground finely and evenly without referring to the fine grinding time by sensing the sound generated inside a mill by means of a microphone to sense the grain size in the mill and discontinue the mill work when the same comes to a set grain size. CONSTITUTION:A mill is formed with a cylindrical drum 1, and a microphone 7 is disposed below said drum 1 to sense the impact sound generated when the drum 1 rotates. An amplifier circuit 8 is connected with said microphone 7, and a control circuit 9 for controlling the action of the mill is connected with said amplifier circuit 8 according to the input values. A raw material of slurry is fed into the drum 1, and the impact sound of impact of feldspar, silica, boulder and the like with the drum 1 is large and high in the initial stage, and gets lower gradually as the material is granulated smaller. Said impact sound, therefore, is sensed successively by the microphone 7, and when the sound amount is lowered to the set value (a), the grain size comes to the set grain size, and a driving motor 5 is stopped by the control circuit 9.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a mill for making a slurry (1) for making ceramics, etc., and a method for making slurry in the mill to a certain particle size. It is related to the device.

[Prior art]

Traditionally, clay has been used to make clay, which is the raw material for ceramics.
Feldspar, silica, cobblestone, water, etc. were put into the mill at a fixed rate to form a cotton layer. Then, the particle size of the cotton layer formed by the mill was determined by mixing the raw materials, etc., and setting the dusting time to obtain a slurry.

[Problem to be solved by the invention]

However, since the raw materials for slurry inside the mill are input from one end and the slurry is pushed out from the other end, if the amount of input materials such as clay or water is different, or the moisture content of the clay is different, only the time can be adjusted to 1tiIJ. If this were done, the particle size would not be constant, and there would be differences in the finished product, such as hardness.

Also, although it is possible to insert a sensor inside the mill to detect the viscosity, it will wear out due to cobbles etc. during operation.
Therefore, it is necessary to stop the mill operation, which reduces efficiency.

[Means to solve the problem]

In view of the above points, the present invention is constructed as follows in order to be able to easily detect the particle size and control the milling operation.

A microphone is placed near the drum in the mill, and the microphone detects the sound emitted from inside the mill to detect the grain size inside the mill, and the mill operation is stopped when the set grain size is reached.

[For production]

Since the present invention is constructed as described below, when raw materials are put into the mill and the ram is rotated, impact noise is generated due to the collision of stones and stones and stones and drum. The sounds rub against each other, water and clay? The impact sound is reduced by F4. The impact sound generated in this way is detected one after another by a microphone, amplified by an amplifier circuit Q, and when the value of the impact sound falls below a certain value by a control circuit, the drive motor is stopped and the rotation of the drum is stopped. 1 unit stopped the mill work,
- It is intended to obtain slurry with a fixed particle size.

[Embodiments of the invention]

Next, the configuration of the embodiment shown in the attached drawings will be explained.

Figure 1 shows the mill and the control device of the present invention.
The figure is a cross-sectional view of the raw material placed in the mill, and FIG. 3 is a diagram showing the relationship between input values obtained from the microphone and time.

The mill rotates a cylindrical drum 1 to layer the cotton, and rotating shafts 2 on both sides are pivotally supported on support stands 3.
- A sprocket 4 is fixed to the rotating shaft 2 in the example, and a sprocket is fixed to the drive shaft of the drive motor 5, -J
The drum 1 is configured to be rotated by the drive of the drive motor 5.

A raw material 1 input port 1a is provided on a part of the circumferential surface of the tonne J,1, and can be opened and closed when inputting raw materials and discharging slurry.

A microphone 17 is provided below the tram 1 so that the impact sound generated when the drum rotates 10 times can be detected. However, the position of the macrophone 7 is suitable for the position where the impact noise is the loudest, and the position can be adjusted depending on the rotational speed of the drum and the amount of raw material input.

An amplifier circuit 8 for obtaining a constant sound volume is connected to the microphone 7, and a control circuit 9 for controlling the operation of the mill according to the human power value is connected to the amplifier circuit. Connected to the circuit 1 is an input device 14 for inputting the drive motor 5 that drives the drum 1 and setting values for stopping the mill, and a display circuit 15 that indicates input values from the microphone 7, operation, stop, alarm, etc. has been done.

In such a configuration, as shown in FIG. 2, inside the drum 1 are clay]O, which is the raw material for slurry, feldspar and silica 11,
Cobblestones 12, water 13, etc. are charged at a constant rate from the input port 1a, and the drive motor 5 is driven to rotate the drum 1, thereby forming a cotton layer.

During the work on the cotton layer, not only viscosity, water, and stones are mixed, but also feldspar, silica stone 11, cobblestone 12, etc. are rubbed against each other in the drum 1.
The impact sound between the feldspar, silica 11, cobblestone 12, etc. and the drum 1 at this time may be due to the impact being made into fine grains by hitting the drum 1, as shown in Figure 3. The sound becomes louder, and as the drum is rotated and the raw materials inside become finer particles, the viscosity also increases and the impact noise gradually becomes smaller.

Therefore, when the impact sound of the car is sequentially detected by the microphone 7, amplified by the amplifier circuit 8, and the volume decreases to the set value a inputted by the input device 14, it means that the particle size has reached the set particle size. The drive motor 5 is stopped by the control circuit 9 (a). Incidentally, it is also possible to determine the sound pressure level and to stop the drive motor when the attenuation value reaches a set value.

〔effect〕

By virtue of the second configuration, the present invention can achieve the following effects.

In other words, the structure is such that the impact sound generated during milling is detected and the particle size is controlled based on the value, so that the fine dust gets trapped in a simple detection device and the cotton layer is constantly detected. This made it possible to obtain slurry of the desired particle size while keeping the quality constant.

In addition, since the drum is configured to detect particles from the outside without installing a sensor, the sensor that detects the particle size does not wear out, improving durability and making maintenance easier.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the mill and the control device of the present invention, Fig. 2 is a cross-sectional view of the raw material placed in the mill, and Fig. 3 is a drawing showing the damping characteristics obtained from the machine. . ■ Dora J1 Microphone

Claims (1)

[Claims] The mill is characterized in that a microphone is arranged near the drum in the mill, the microphone detects the sound emitted from inside the mill, the grain size inside the mill is detected, and the mill operation is stopped when the set grain size is reached. Polishing control device.