JPS6320954Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a drying device that efficiently dries the material to be dried in the rotating drum by heating the rotating drum while rotating. The goal is to prevent the rubber friction wheel that rotates the drum from deteriorating and being damaged by the heat that warms the drum, and to ensure that the drum always rotates in a stable state to improve the efficiency of drying work. .

Conventionally, while rotating the rotary drum, the inside of the rotary drum is heated to a required temperature by an external heat source to dry the material to be dried stored in the rotary drum. Conventionally, means for heating the inside of the rotating drum include circulating hot water inside the rotating drum through piping to heat the inside of the rotating drum, or directly feeding hot air into the rotating drum. It was warming up. However, since the rotating drum is made of a metal material such as a stainless steel plate, if the inside of the rotating drum is kept at the required temperature during drying work, the rotating drum will reach almost the same temperature as the inside. It is heated. However, in order to maintain good friction with the rotating drum, heat-resistant rubber wheels are normally used for the friction wheels that rotate the rotating drum in response to the rotational force of the electric motor. Friction wheels can become distorted due to heat when the temperature of the rotating drum itself increases.
There is a risk that the rotational force of the electric motor will not be transmitted smoothly to the rotating drum due to softening.In other words, the temperature inside the rotating drum cannot be raised, so the drying process takes time and the work becomes difficult. In addition, it was difficult to dry items that required high-temperature drying.For this reason, for example, large metal parts were installed in the body of the rotating drum. A gear is disposed around the drum, and a small metal gear that receives the rotational force of an electric motor is meshed with the large gear to cope with the above-mentioned problems caused by the temperature rise of the rotating drum. However, this method uses metal gears instead of rubber friction wheels, so
Not only does the rotating drum generate extremely loud noise while it is in operation, but it also requires a lot of time and effort to manufacture the rotating drum because large diameter gears are placed around the outer periphery of the rotating drum, which also increases the manufacturing cost. It was hot.

The present invention eliminates the above-mentioned drawbacks, suppresses the transfer of heat from the rotating drum to the rubber friction wheel, prevents deterioration and damage of the friction wheel due to heat, and maintains the rotating drum in a stable state for a long time. The present invention provides a drying device that can be operated in the following manner.An embodiment of the present invention will be explained below with reference to the drawings.The reference numeral 1 is a base of the drying device, and the four corners of this base 1 are provided with markings as shown in Figure 1. Bearings 3 are disposed to support the rotating shafts 2 in parallel with each other. 4 is a friction wheel made of heat-resistant rubber fixed to both ends of the rotating shaft 2 so as not to contact the base 1; 5 is a pulley installed between the bearings of the rotating shaft 2; and 5 is a pulley attached to the back surface of the base 1. A belt 8 is stretched in a V-shape between the electric motor 6 and the base 1 through a belt insertion hole 7. Reference numeral 9 denotes a rotary drum formed of a steel plate into a hollow cylindrical shape and rotatably mounted on the friction wheel 4. A plurality of scraping plates 10 are arranged on the inner peripheral surface of the rotary drum 9 along the axis of the rotary drum 9.
are arranged at required intervals in the circumferential direction. Both ends of the rotary drum 9 in the axial direction have a lid body 11 that opens and closes an opening formed in a truncated conical shape and having a smaller diameter than the body, which has a larger diameter.
is removably attached with a locking metal fitting 12. Reference numeral 13 denotes a cover tube that surrounds the outer periphery of the inclined surface a formed by narrowing both sides of the rotating drum 9, and has approximately the same diameter as the outer periphery of the large-diameter body of the rotary drum 9. A flange 13a is integrally formed on one side facing outward, and when this cover tube 13 is attached to the rotating drum 9, a flange 13a is formed on the large-diameter body of the rotary drum 9 so that the flange 13a corresponds to the flange 13a of the cover tube 13. The cover tube 13 is attached to the installed mounting piece 14 via a hard heat insulating member 15 formed into a ring shape from a material with excellent thermal insulation, such as an asbestos cement board.
is fixed by bolting using the flange 13a. Then, the rotating drum 9
The friction wheels 4, 4 are mounted using the outer periphery of the cover tube 13.
It will be rotatably mounted on top. 16 connects the lower half of the large-diameter body of the rotating drum 9 to the rotating drum 9.
This is a box for mounting a heating device that is mounted on the base 1 so as to sandwich it from both sides of the drum. The heating device 17 has an induction heating coil 17a and a magnetic shielding plate made of a ferrite core arranged under the coil 17a using a heat-resistant resin having an arc shape. The top plate 18 is attached to the box plate 16 so as to be exposed on the side of the rotating drum 9 in correspondence with the lower surface of the rotating drum 9. As shown in FIG. 3, the high-frequency induction heating device 17 converts a commercial frequency power source 19 into a DC power source using a rectifier 20, converts it into high-frequency power using a high-frequency 1 inverter 21, and then converts it into high-frequency power using an induction heating coil 17a. A high frequency current is applied, and the high frequency magnetic flux generated by the induction heating coil 17a generates an eddy current in the metal of the rotating drum 9, causing the rotating drum 9 to generate heat due to the Joule heat generated by the resistance of the metal. 2
A temperature sensor 2 detects the heating state of the rotating drum 9, and is arranged below the rotating drum 9 at a required interval. Reference numeral 23 denotes a small box connected to both sides of the box 16 (on the left and right sides in FIG. 1), which accommodates the bearing 3 and pulley 5 inside, and connects the rotating shaft 2 from the left and right small boxes 23. The friction wheel 4 is mounted on the base 1 together with the box 16 in a penetrating state, and the friction wheel 4 is fixed to the protruding end of the rotary shaft 2. Reference numeral 24 denotes a cover that covers the upper half of the large-diameter body of the rotating drum 9 so that it can be opened and closed freely without interfering with the rotation of the rotating drum 9. As shown in FIG. A heat insulating material 25 such as Glasral is pasted on the inside, and it is attached to the small box 23 with a hinge b so that it can be opened and closed, and as shown by the solid line in FIG.
When 4 and 24 are surrounded on the rotating drum 9,
The covers 24, 24 are latched at their tops by a latch 26 to prevent the covers 24, 24 from being opened. 27 is a cooling fan for the induction heating coil 17a installed in the case 16, 28 is an outside air inlet, and 29 is a moisture drain provided by pasting a fine wire mesh to an opening in the center of the lid 11. The outlet 30 is a heat insulating material pasted on the inside of the cover tube 13,
31 is a cover plate that prevents the heat insulator 30 from being exposed to the outside.

As described above, in the present invention, the rotating drum 9 that is rotatably mounted on the base 1 via the friction wheel 4 has a large-diameter body end portion of the rotating drum 9 at both ends in the axial direction. A cylindrical cover tube 13 is attached to a ring-shaped mounting piece 14 provided around the circumference of the rotating drum 9 via a heat insulating member 15, and the friction wheel 4 is brought into sliding contact with this cover tube 13.
is rotatably mounted on the base 1, and a box 16 containing the high-frequency induction heating device 17 is placed on the lower half of the outer periphery of the body of the rotary drum 9 on the base 1 with the rotary drum 9 sandwiched therebetween. Furthermore, a heat insulating material 25 is attached to the upper half of the outer periphery of the body of the rotating drum 9.
The covering body 24 with the above-mentioned material affixed thereon is attached to the small box body 23 connected to the box body 16 so as to be openable and closable while keeping a required distance from the rotating drum 9, so as to cover the upper half of the rotating drum 9. When drying, remove one side of the lid 11 from the rotating drum 9 and
After storing an appropriate amount of material that requires drying inside, the lid body 11 is again attached to the rotating drum 9 using the locking metal fittings 12. Thereafter, the drying temperature is set using the scale 32 and the switch S is turned on. As a result, the electric motor 6 is started and rotates the rotary drum 9 by the friction wheel 4 via the cover tube 13, and also passes through the rectifier 20 and high frequency inverter 21 to the induction heating coil 17.
A high frequency current is passed through the induction heating coil 17a, and the high frequency magnetic flux generated by the induction heating coil 17a generates an eddy current in the metal of the rotating drum 9, thereby heating the rotating drum 9. Therefore, the material to be dried on the rotary drum 9 is gradually dried by the heat that heats the rotary drum 9 while being scraped up inside the rotary drum 9 . Moisture generated within the rotating drum 9 is discharged to the outside through the dehumidification hole 29 of the lid 11. When the heating temperature of the rotating drum 9 reaches the set temperature, it is detected by the temperature sensor 22, and this detection signal is passed through the comparison element 33 to the control unit 3.
The controller 34 sends a stop signal to the high frequency inverter 21 to stop the high frequency inverter 21 and temporarily stop heating the rotating drum 9. When the temperature of the rotating drum 9 falls below the set value, the high frequency inverter 21 is operated again according to a command from the control unit 34 to reduce the temperature of the rotating drum 9.
Resume heating. By repeating such an operation, the drying process for the material to be dried in the rotating drum 9 is performed. In addition, during the drying work, the induction heating coil 1
7a is cooled by the fan 27, so it does not overheat, and since the cooling air passes through the inside of the box 16 and is discharged to the outside from the belt insertion hole 7 of the base 1, the rotating drum 9 is cooled. Never. After drying, when taking out the dried material from the rotary drum 9, the cover 2 covering the upper half of the rotary drum 9 is removed.
4 and 24 are opened as shown by the two-dot chain line in FIG. 2, and after the rotary drum 9 has cooled down, the lid 11 is opened and taken out. Note that the rotary drum 9 may be forcibly cooled from the outside to take out the dried material early.

It should be noted that the present invention is also applicable to the case where the cover tube 13 is provided around the outer periphery of the large-diameter body of the rotating drum 9 with the heat insulating member 15 interposed therebetween.

Since the present invention is configured as described above, it has the following effects.

(1) The cover tube that comes into sliding contact with the friction wheel is attached to the end of the rotating drum through a heat insulating member, so the cover tube has a heat insulating material that blocks heat conduction from the rotating drum. As a result, the rubber friction wheels do not get damaged by the heat that heats up the rotating drum, unlike conventional rubber friction wheels.
The friction wheel can be used in a stable state for a long period of time. Therefore, the heating temperature of the rotating drum can be set in accordance with the drying temperature of the object to be dried, which has the advantage that the drying work can be carried out smoothly and efficiently. In addition, since a rubber friction wheel can be used, the noise of the drying equipment can be reduced.
Cost reduction can be achieved.

(2) Furthermore, since the cover tube that comes into sliding contact with the friction wheel can be attached using the end of the rotating drum, it is not necessary to make the rotating drum particularly large or to make it difficult to take in and out the material to be dried. The rotating drum can be installed by effectively utilizing the space created on the outer periphery of the inclined surface formed by squeezing both sides of the rotating drum in the axial direction, and its structure is only cylindrical. There is no particular increase in the production cost.

As explained above, the present invention suppresses the transfer of heat from the rotating drum to the friction wheel made of heat-resistant rubber on which the rotating drum is rotatably mounted, thereby avoiding damage to the friction wheel due to heat. The present invention provides a drying device capable of operating a rotating drum that is heated to a predetermined temperature by a heating device in a stable state over a long period of time.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of the drying device of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a schematic diagram for explaining the operation of the drying device of the present invention. It is. 4... Friction wheel, 9... Rotating drum, 13... Cover tube, 15... Heat insulating member.

Claims (1)

[Scope of utility model registration request] A rotary drum rotatably mounted on a friction wheel is rotated by the electrically driven friction wheel, and the material to be dried in the rotary drum is stirred and heated by heat that heats the rotary drum. In the dryer for drying, a cover tube is attached to both ends of the rotary drum in the axial direction through a heat insulating member having excellent thermal insulation properties, and the rotary drum is placed on the friction wheel via the cover tube. A drying device characterized by being mounted rotatably.