JPS5943034Y2 - Dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dryer of the so-called rotating drum type, which is equipped with electrodes for detecting the degree of dryness of the material to be dried within the drum.

A so-called rotary drum type dryer, that is, a drum with a cylindrical horizontal axis is rotatably installed, and the material to be dried stored in the rotary drum is stirred up and down by the rotation of the drum, and is quickly blown with hot air. Conventionally, in devices designed to dry evenly, electrodes are attached to the inner circumferential wall of the body of the drum, and a slip ring, which is a good electrical conductor, is provided on the outer circumferential wall of the drum body along its entire circumference. A brush that slides against the outer peripheral surface of the slip ring that rotates with the rotation of the drum is provided at a stationary part outside the drum, and the dryness signal of the object to be dried is detected by the contact between the electrode and the object to be dried. is transmitted to a receiving section, for example, a control circuit, through the sliding contact between the slip ring and the brush, and when the material to be dried is sufficiently dried and its electrical resistance exceeds a predetermined value, the control circuit is sent to the control circuit to generate hot air and A configuration is provided that automatically stops the rotation of the drum.

However, in the above-mentioned conventional configuration, since the material to be dried is stirred up and down in the drum during drying as described above,
The drum tends to swing up and down due to the objects to be dried and the impact of falling due to this vertical agitation, and therefore the slip ring provided on the outer peripheral wall of the drum also swings up and down, resulting in the friction between the slip ring and the brush. The connection tends to be unstable, and even if the drying of the material to be dried is not completed, the control circuit may malfunction and stop the generation of hot air or the rotation of the drum, resulting in poor reliability. .

Furthermore, since a slip ring, which is a good electrical conductor and is expensive, is provided all around the outer circumferential wall of the body of the drum, there is a problem in that it is relatively expensive.

The present invention has been made in view of the above circumstances, and therefore, its purpose is to provide a dryer that can improve reliability and be inexpensive.

An embodiment of the present invention will be specifically described below with reference to the drawings.

To explain the overall structure of the housing in FIG. A filter 5 is formed directly below the entrance/exit 4, and this filter 5
A dust filter 6 is attached to the holder.

Reference numeral 7 denotes a door for opening/closing the entrance/exit port 4 for dried materials attached to the front plate 2, and a door back 9 protruding from the back side thereof to create a gap 8 between the door 7 and the peripheral edge of the entrance/exit 4 for dried materials. ing.

On the other hand, a group of intake holes 10 are formed around the back plate 3,
A baffle plate 12 having a heater 11 is attached to its inner side.

13 is a duct piped in the lower part of the outer box 1, one end 13a of which is extended through the filter housing 5, and the other end 13b is connected to the back plate 3.
An end tube runs from the bottom of the machine to the rear of the machine.

14 is a fan casing part 15 which is a part of the duct 13
The fan is installed inside the fan casing part 15 and is driven to rotate by a motor 16 outside the fan casing part 15.

17 is a rotating drum installed inside the outer box 1, and the inside is a drying chamber 1.
8, the front part of this drum 17 is supported on the front plate 2 via a bearing member 20 fitted in the peripheral part 19 of the drying material inlet/outlet 40, and the rear part of the drum 17 is supported in the center here. Shaft 21 which is a drum shaft inserted into
The drum 17 is supported by the back plate 3 via a bearing 22, so that the drum 17 rotates around the shaft 21 together with the rear plate 3.

23 is a baffle formed on the peripheral wall of the body of the drum 17 for stirring the material to be dried; 24 and 25 are a pair of electrodes attached to one of the baffles 23 located in the drying chamber 18; 26 is a drum 17; A group of intake holes formed on the rear wall; 27 is a pulley attached to the end of the motor 16 opposite to the 7-ring 14; 28 is a belt stretched between the pulley 27 and the drum 1T; 29 is a constant This is a tension pulley that provides tension.

Now, to explain the configuration of the main parts in Figure 2, 3
Reference numeral 0 denotes a ring holder manufactured in a cylindrical shape from an insulating material such as synthetic resin, which is fitted onto the shaft 21 and attached to the center of the rear wall of the rotary drum 17 with a screw 31. There is.

Reference numerals 32 and 33 denote a pair of slip rings made of a good electrical conductor, which are arranged side by side on the outer peripheral edge of the ring holder 30 so as to be insulated from front to back. It is particularly provided concentrically with the shaft 21 at a location near the shaft 21, which is the center.

34 is a brush holder manufactured in a ring shape from an insulating material such as synthetic resin, similar to the ring holder 30, and 2 is attached to the back, which is a stationary part outside the rotating drum 17, via an elastic body 35 such as rubber. It is attached to the center of the face plate 3 with a screw 36.

Reference numerals 37 and 38 denote a pair of brushes located on the inner peripheral edge of the brush holder 34 and arranged side by side in an insulated manner from front to back.They are ring-shaped like the slip rings 32 and 33, respectively, and the front brush 37 to the outer circumferential surface of the slip ring 32 at the front, and the brush 38 at the rear to the outer circumferential surface of the rear slip ring 33, the brush 37 can be attached to the entire circumference of the slip ring 32.
Moreover, the brushes 38 are provided around the entire circumference of the slip rings 33, and cover the outer peripheral surfaces of the slip rings 32 and 33, respectively, so that the sliding contact portions of the slip rings 32 and 33 are not exposed.

Here, the slip rings 32 and 33 are also covered by a brush holder 34 adjacent to them.

39 is a lead wire led out from the electrode 24 and connected to the slip ring 32, and 40 is a lead wire led out from the electrode 25 and connected to the slip ring 33.

Although not shown outside the rotating drum 17, there is a brush 37.
A lead wire 41 from the brush 38 and a lead wire 42 from the brush 38
A receiving section, for example, a control circuit, is provided to receive signals from these connected devices.

In addition, 43 is a stop ring for suppressing the rattling of the shaft 21 and the rotating drum 17 in the front and back direction;
is the cover.

Next, to explain the operation of the above configuration, the rotating drum 1
In order to dry the material to be dried A stored in the container 7, first, the heater 11 is energized to generate heat, and the motor 16 is
The fan 14 and the drum 11 are energized to rotate the fan 14 and the drum 11, thereby hot airing the outside air sucked through the intake hole group 10 of the back plate 3, and stirring the material A to be dried up and down.

Then, the hot air sucked into the drying chamber 18 from the suction hole group 26 is dried by the object to be dried AKa which is being stirred, and is further passed through the gap 8 and the dust collection filter 6 to the other end 1 of the duct 13.
Released from 3b to outside the aircraft.

The material to be dried A stirred in the drying chamber 18 comes into contact with the electrodes 24 and 25 due to the stirring, and this contact causes the electrodes 24 and 25 to output the electrical resistance of the material to be dried A as a dryness signal. To detect.

Then, the dryness signal detected in this way is transmitted to the lead wire 39.
and 40 - sliding contact between slip rings 32 and 33 and brushes 37 and 38 - transmitted to the control circuit via lead wires 41 and 42.

Here, the electrical resistance of the object A to be dried is small when the object A is wet and increases as it dries, and the control circuit is designed to respond to this. As the drying progresses, when the electrical resistance, in other words, the dryness signal becomes greater than a predetermined value, the control circuit automatically cuts off the electricity to the heater 11 and motor 16 to stop the drying operation.

Now, during the drying operation as described above, the rotary drum 17 tilts back and forth due to the impact of falling as the material to be dried A is stirred up and down, and the rotary drum 17 moves exclusively up and down around the shaft 21. However, in this case, the vibration of the portion near the shaft 21, which is the center of rotation of the rotating drum 170, is significantly smaller than the vibration of the outer circumferential wall of the drum 17, or almost nonexistent.

In this regard, in this embodiment, as mentioned above, the sea shaft 2
A ring holder 30 is fitted and inserted into the shaft 21 , and the slip rings 32 and 33 are installed in the ring holder 30 .
Since the slip ring 3 is provided in a nearby location, the slip ring 3
The vibrations of the drums 2 and 33 can be similarly significantly reduced or almost eliminated, and therefore the sliding contact can be carried out almost independently of the vibrations of the drum 17 and can always be kept in a stable state, which is different from the conventional method. Different control circuits will not malfunction and their reliability can be greatly improved.

Furthermore, the slip rings 32 and 33 are attached to the rotating drum 170.
Since it is provided near the shaft 21, which is the center of rotation, the size of the expensive slip rings 32 and 33 can be made significantly smaller than in the past, and the price can be reduced accordingly.

In particular, since the slip rings 32 and 33 are provided around the shirt 121, which is the center of rotation of the rotating drum 1γ, concentrically with the shaft 21 via only the ring holder 30,
The slip rings 32 and 33 can be kept to a minimum size, making it even more advantageous.

By the way, 1. Conventionally, the brush only partially slides on the outer circumferential surface of the slip ring provided all around the outer circumferential wall of the body of the rotating drum, and the outer circumferential surface of the slip ring other than the sliding contact area is exposed. If it is exposed in this way, lint, etc. released from the material to be dried during drying will adhere to the exposed surface, and as a result, the sliding contact between the slip ring and the brush will be inhibited by the attached lint, etc. As a result, there is a problem in that the transmission of the dryness signal is hindered.

In this regard, in this embodiment, the brush 3T is provided in an annular manner around the entire circumference of the slip ring 32, and the brush 38 is provided in an annular manner around the entire circumference of the slip ring 7' IJ ring 33, so that the slip ring 32 and It is possible to eliminate the exposure of the sliding contact portion of No. 33, so that lint does not adhere to the sliding contact portion,
Therefore, slip rings 32 and 33 and brushes 37 and 3
Good sliding contact with 8 can be ensured at all times, and the dryness signal can also be transmitted smoothly.

In particular, in this embodiment, in which the brush holder 34 holding the brushes 37 and 38 is attached to the back plate 3 via an elastic body 35, the brushes 37 and 38 are
The brushes 37 and 38 can be made to follow the slip rings 32 and 33 better, and the sliding contact between the brushes 37 and 38 and the slip rings 32 and 33 can be further ensured.

Incidentally, the brush holder 34 via such an elastic body 35
Attaching the slip ring 32 around the shirt 121
and 33 may be arranged so as to provide only those for which further effects are desired.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and may be implemented with appropriate modifications within the scope of the invention.

As explained above, the present invention includes an electrode provided inside a rotating drum supported by a shaft, and a dryness signal detected by the electrode coming into contact with the material to be dried in the drum, which is detected by a slip ring and a brush in sliding contact therewith. In the dryer, a ring holder is fitted and inserted into the shaft, the slip ring is provided on the outer circumferential surface of the ring holder, and the brush is connected to the slip. It is characterized by being provided in an annular shape around the entire circumference of the ring.This makes it possible to significantly reduce or almost eliminate the deflection of the slip ring, and also allows the sliding contact portion of the slip ring and brush to float. A dryer that has excellent practical effects in that it can be protected from lint, and therefore its sliding contact can always be kept in a stable and good condition, greatly improving reliability, and furthermore, reducing the price. It is possible to provide

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being an overall longitudinal sectional side view, and FIG. 2 being an enlarged longitudinal sectional side view of the main parts. In the figure, 3 is a back plate (stationary part outside the drum), 1T is a rotating drum, 21 is a shaft, 24 and 25 are electrodes, 30 is a ring holder, 32 and 33 are slip rings, 34
35 is a brush holder, 35 is an elastic body, 37 and 38 are brushes, and A is an object to be dried.

Claims (1)

[Claims for Utility Model Registration] 1. An electrode is provided inside a rotating drum supported by a shaft, and a dryness signal detected by the electrode when it comes into contact with an object to be dried in the drum is detected by a slip ring and a brush that is in sliding contact with the slip ring. In this device, a ring holder is fitted onto the shaft, the slip ring is provided on the outer peripheral surface of the ring holder, and the brush is attached to the entire surface of the slip ring. A dryer characterized by being installed in a ring around the circumference. 2. The dryer according to claim 1, wherein the brush holder holding the brush is attached to a stationary part outside the drum via an elastic body.