JPS632639B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a dehydrator that controls the rotation of a dehydrating tank without using a timer such as a clockwork type, and when the material to be dehydrated reaches the optimum dehydration rate. The purpose is to quickly stop dehydration.

Conventional dehydrators operate a timer depending on the amount of material to be dehydrated or the fabric thereof, and set the dehydration time as appropriate. In this way, if you set the dehydration time unilaterally, if the material to be dehydrated is put into the dehydration tank in an unbalanced state and it takes a long time for the rotation to start up at the beginning of dehydration, the timer setting time will change. However, the disadvantage is that the desired degree of dehydration effect cannot be obtained.

The present invention eliminates such conventional drawbacks,
Examples thereof will be described below. Figure 1 shows the characteristic N that shows the relationship between the operating time and the rotation speed of the motor (dehydrating tank) and the characteristic S that shows the relationship between the operating time and the dewatering rate in a dehydrator in which a dehydrating tank is directly connected to the motor. Each is shown below. As is clear from characteristic S, the dehydration rate takes a short time to rise, and saturates after a certain period of time. When using a conventional timer, the set time is set to a time at which the dehydration rate is saturated, which causes the above-mentioned problems.

On the other hand, the relationship between the cumulative number of rotations expressed as the product of the number of rotations and time of the dehydration tank and the dehydration rate is as shown in Figure 2. Therefore, it is possible to detect how many times the dehydration tank has rotated after the start of dehydration. If this is controlled, a constant dehydration rate can always be obtained regardless of the rise characteristics.

A specific configuration for obtaining the characteristics shown in FIG. 2 is as shown in FIG. 3. In this Figure 3, 1 is a power supply, 2 is a motor for rotating the dehydration tank, 3 is a motor 2,
This is a control circuit connected between power supply 1.

4 is a device for detecting the rotational speed of the motor 2, which is mainly composed of an integrated circuit (Hall IC) that integrates a Hall element that detects changes in the magnetic field and an amplifier that amplifies the output from this element, or a photocoupler, etc. Output digital value. 5 is a counter,
The output of the rotation detection device 4 is counted and the output is input to the comparator 6. Reference numeral 7 denotes a reference setting circuit in which a reference rotation speed is set. Comparator 6 compares the output of counter 2 and the output of reference setting circuit 7,
Output when both match. The control circuit 3 receives the output from the comparator 6 and operates to stop the power supply to the motor 2.

The reference setting circuit 7 is configured so that its reference value can be freely and variably set.

According to the above configuration, the user can set the reference value according to the amount of material to be dehydrated and the fabric.
When the dehydration tank reaches the (rotation speed of the dehydration tank) x (time) corresponding to the reference value, the rotation of the motor 2 can be stopped, and a constant dehydration rate can always be obtained.

As described above, the dehydrator control device of the present invention includes means for integrating the number of revolutions of the dehydrating tank, and means for comparing the number of revolutions integrated by this means with a set value,
The system is configured so that the rotation of the dehydration tank is stopped when the rotation speed reaches the reference value, and the dehydration rate can always be kept almost constant regardless of the start-up characteristics of the dehydration tank, and the reference value can be changed. The optimum dehydration effect can be given according to the amount of material to be dehydrated and the type of fabric by setting, and there is also an effect that the dehydration rate does not get tired due to unnecessary operation for a long time in a state where the dehydration rate is saturated as in the past.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the rotational speed and dewatering rate of a dehydrator in an embodiment of the present invention, FIG. 2 is a diagram showing the basic principle of the present invention, and FIG. 3 is an electric circuit diagram showing its specific configuration. 2...Motor, 5...Counter, 6...Comparator.

Claims (1)

[Claims] 1.Equipped with means for integrating the number of rotations of the dehydration tank, and means for comparing the number of rotations integrated by this means with a reference value, and said reference value is determined according to the amount of material to be dehydrated and the type of fabric of the dehydrated material, etc. A control device for a dehydrator, characterized in that the control device is configured to be arbitrarily variable, and configured to stop the rotation of the dehydration tank when the integrated number of rotations reaches a reference value.