JPS58163712A - Rotating drum type dryer - Google Patents

Abstract

PURPOSE:The titled machine, designed to set the rotational speed of a rotating drum according to the amount of a material to be dried, capable of preventing the material in a large amount from entangling in the form of a dumping and further the rotation of the material to be dried together with the drum while sticking to the inner surface thereof. CONSTITUTION:A lead switch 12 is turned on by a permanent magnet 10 on every rotation of a rotating drum 1, and signals generated by the turning on of the lead switch 12 are processed by a control circuit to sense the rotational speed of the rotating drum 1. The control circuit is capable of keeping the output of a motor 3 at the time of starting the hot-air drying step constant, and sensing the amount of a material to be dried contained in the rotating drum 1 on the basis of the signals from a sensing mechanism 9 for the rotational speed to store the amount in a memory. Thus, the rotational speed of the motor 3 is changed in proportion to the memorized amount of the material to be dried.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotary drum type dryer that dries materials to be dried while stirring them within a rotating drum.
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[Technical Background 4 of the Invention and Its Problems] In the conventional rotary drum dryer, 1. When the amount of material to be dried is large, the rotation speed of the rotary drum becomes slow, and the amount of material to be dried decreases. The rotational speed of the rotating drum tended to increase when the amount of Therefore, when there is a large amount of material to be dried, the rotation speed of the rotating dot is slow as described above, even though the material to be dried is in a state where it is likely to get tangled in a ball shape. As the stirring ability decreases, the material to be dried becomes more likely to become entangled in clusters or particles, and if the amount of material to be dried is small, the material to be dried may adhere to the inner surface of the rotating drum due to centrifugal force. As mentioned above, the rotational speed of the rotating drum increases and the centrifugal force increases, despite the fact that the so-called co-rotation occurs and the stirring becomes insufficient. As a result, the conventional rotary drum type dryer has a serious drawback in that the drying efficiency deteriorates depending on the amount of the material to be dried. Ta.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to reduce the amount of material to be dried in the form of dumplings when the amount of material to be dried is large.
It is possible to prevent the drying material from drying, and also to prevent the occurrence of so-called co-rotation in which the material to be dried is rotated while being attached to the inner surface of the rotating drum due to centrifugal force when the amount of material to be dried is large. It is an object of the present invention to provide a rotating drum type drying method which can perform sufficient agitation and improve drying efficiency of a material to be dried.

[Summary of the invention]

The present invention is characterized in that the rotational speed of the rotating drum is set proportionally according to the amount of material to be dried.

[Embodiments of the invention]

Embodiments of the present invention will be described below. First, a first embodiment will be described with reference to FIGS. 1 to 4.

In FIGS. 1 and 2, reference numeral 1 denotes a rotary drum rotatably supported within an outer box 2, which is driven via a petite 4 by a motor 3 also disposed within the outer box 2. Further, 5 is a blower duct connected to the back side of the rotating drum 1, and 6 is a heater for generating hot air disposed inside the blower duct 5. When the motor 3 is driven, the rotating drum 1
At the same time, a fan (not shown) is rotated, and according to the rotation of the fan, air is sucked from outside the outer box 2 into the ventilation duct 5, and after being hot-aired by the Toichi Taro, it is supplied into the rotating drum 1. Further, 7 is an opening provided on the front side of the outside 12 for entering and exiting the material to be dried, and 8 is a door provided to open and close this opening 7.

Now, 9 is a rotation speed detection mechanism which is a detection means for detecting the amount of material to be dried stored in the rotary drum 1.
This consists of a permanent magnet 10 attached to the back surface of the rotating drum 1 and a round reed switch 12 attached to an O-arm 11 for supporting the rotating drum 1 so as to face the rotation locus of the second permanent magnet 100. In this rotational speed detection mechanism 9, the reed switch 12 is activated every time the rotating drum 1 rotates once.
is turned on by the permanent magnet 10, and a signal generated in response to the turning on is processed by a control circuit 15, which is a control means to be described later, to control the ID rotating drum 10.
The number of rotations per unit time, that is, the rotational speed of the rotating drum 1 is detected. In this case, under the condition that the output of the basket 5 is constant, as shown by the two-dot chain line in FIG. The rotational speeds of the rotary drum 1 are continuous, and therefore, the amount of material to be dried can be determined based on the rotational speed of the rotary drum 1 detected as described above.

On the other hand, FIG. 4 shows the electrical configuration of the control circuit 15 and related parts, which will be described below. That is, the control circuit 13 performs a hot air drying process II@ in which hot air is supplied to the inside of the rotary drum 1 while rotating it.
A cold air drying step in which cold air is supplied to the inside of the chotsum 1 while rotating it.

This is to automatically execute the drying operation end notification process in sequence, and basically consists of d, OP'U14. Timer circuit 1
5. It is configured as a microcomputer including a workbook controller A/E circuit 16, a memory 17, an input buffer control circuit 18, and an output buffer controller A/A/circuit 19. ? : , control circuit 13
In the external input section, 20 is a door switch for detecting opening/closing of the door 8, 21 is a temperature switch for detecting the exhaust temperature from the rotating drum 1, and 22 is a time selection switch for setting the drying operation time. , the rotational speed detection mechanism 9 is also included in this external input section. In the external output section 11 of the control circuit 15, 23 is a buzzer for notifying the end of the drying operation O, 24 is a light emitting element for displaying W that the drying operation is being carried out, and %
This external output section BK is configured. The control circuit 1s receives a signal from the external input unit 4117 via the push buffer control circuit 18, and reads out data from the memory 4117 according to the read contents, thereby controlling the hot air drying process and the cold air drying process. And each part of the external output section B necessary for executing the end notification process is controlled via the output buffer control circuit 19. Therefore, of the contents of control by the control circuit 15, only nine parts directly related to the essential WK of the present invention will be explained. That is,
The control circuit 13 maintains the output of the mower 113 at a constant level at the start of the hot air drying process, and during this holding period, the control circuit 13 maintains the output of the motor 113 at a constant level, and controls the speed of the drying material stored in the rotary drum 1 based on the signal from the rotational speed detection mechanism 9 during this holding period. The amount of the object is detected as described above and stored in the memo 17, and after the above retention period has elapsed, the memo! The motor 3 is stored in the memory 717 according to the amount of dried material.
The rotation speed of the rotating drum 10 is shown in Figure 3 by frequency control or voltage control of the 0 rotation speed! j! Set by changing proportionally as shown by the line. As a result of controlling the rotational speed of the drum 10 in one rotation, when the amount of material to be dried is large, the rotational speed of the drum 10 in one rotation increases, increasing its stirring ability. ni<<S, again,
When the amount of material to be dried is small, the rotational speed of the rotating drum 10 becomes slow and its centrifugal force becomes small, so that so-called co-rotation occurs in which the material to be dried is rotated 1E while remaining attached to the inner surface of the rotating drum. This makes it possible to prevent the situation where K<<, resulting in insufficient stirring of the material to be dried.

In the above embodiment, the control circuit 15 detects the amount of material to be dried at the start of the hot air drying process.
A configuration may also be adopted in which the amount of material to be dried is detected again and corrected during the hot air drying process.

Further, in the above embodiment, the rotation speed detection mechanism 9 consisting of the permanent magnet 10 and the reed switch 12 is provided as the detection means, but the fifth F! ! A rotational arrest detection horizontal structure 25 such as the @22s collar shown in J may be provided as a detection means. That is, the same rotation speed detection mechanism 25 in FIG.
, 26 is a light-shielding piece that is integrally polished from the outer circumferential edge of the back surface of the rotary doff A1 in the radial direction thereof, and 27 is a light-emitting element 2 that is arranged to sandwich the rotation locus of the light-shielding piece 260.
7a and a light receiving element 27,
A light-shielding piece 26 is positioned between the light-emitting element 27a1 and the light-receiving element 27b every time the rotating drum 1 rotates once, and the photocoupler 2
When the output voltage changes and the change signal is processed by the control circuit 1s, it is detected that the rotational driver has made 10 rotations.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to prevent the material to be dried from becoming entangled in a ball shape when the amount of material to be dried is large, and it is possible to prevent the material to be dried from becoming entangled in a ball shape when the amount of material to be dried is small. It is possible to prevent the occurrence of so-called co-rotation, in which the material adheres to the inner surface of the rotating drum due to centrifugal force and is rotated 11 times, and to sufficiently agitate the material, thereby improving the drying efficiency of the material to be dried. It is possible to achieve the excellent effect of being able to achieve this goal.

[Brief explanation of the drawing]

Figures 1 to 4 are rounded figures for explaining the tIg1 embodiment of the present invention, with Figure 1 being a cross-sectional view of the whole, and Figure 2 being a cross-sectional view with the back plate of the outer box not removed. Partial rear view, Figure 3 is a diagram showing the relationship between the amount of material to be dried and the rotation speed of the rotating drum,
FIG. 4 is a block diagram showing the electrical configuration. Mae, 1
FIG. 115 is a perspective view of essential parts showing a second embodiment of the present invention. In the figure, 1 is a rotating drum, 2 is an outer box, 5 is a motor, 6 is a heater, 9, 25 is a rotation speed detection mechanism (detection means), 1s
is a control circuit (control means). Figure 1 Figure 2 Figure 3' Figure 4 Figure 5

Claims (1)

[Claims] 1. A detection means for detecting the amount of the material to be dried stored in a rotating drum, and a rotational speed and degree of the rotating drum according to the amount of the material to be dried detected by the detection means. Rotating drum dryer.