JPH07239184A - Screw type drier - Google Patents

Abstract

PURPOSE:To prevent matters to be dried from being deposited on a specific point by fixing an inner heating cylindrical part disposed about an axis to an outer heating casing part so that only a ribbon-shaped screw is rotated. CONSTITUTION:By the construction wherein the position of an outer heating casing part 4 and the position of an inner heating cylindrical part 5 also are fixed and only a ribbon-shaped screw 7 can be rotated, even if matters to be dried (a) are deposited on the part 5 and part 4, the deposited matters (a) are separated from the part 5 or the part 4 by the screw 7 so that the separated matters are sent toward a discharge port 3, while they are heated and dried. And while the matters are sent to the port 3, the matters (a) are crushed and mixed by a plurality of claws 7b provided on the screw 7. As a result, the matters (a) are prevented from being deposited on the part 5 or the part 4 so that heating and drying can be effected efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a screw type for drying various chemical products, industrial products, foods, sludges, plastics, high-concentration fluids, powders, etc. that require drying in the production process. It concerns a dryer.

[0002]

2. Description of the Related Art A conventional screw type dryer of this type is provided with a supply port for supplying a material to be dried at one end and a discharge port for discharging the material to be dried at the other end. A screw body in which a rotary shaft and a blade portion are integrally formed is rotatably supported in the casing portion.
And, for example, the casing is provided with a heating mechanism,
While the material to be dried supplied from the supply port is sent to the outlet side by the screw body, the material to be dried is heated and dried by the casing part.

[0003]

However, according to the screw type dryer having the above-mentioned conventional structure, since the rotary shaft of the screw body and the blade portion are integrally rotated, the rotation shaft and the blade portion are rotated. The material to be dried may adhere to the vicinity of the axis and grow while co-rotating. In this case, the material to be dried may be unevenly dried, or the material to be dried may not be delivered well. Was causing problems. Therefore, conventionally, the material to be dried adhering to the rotary shaft and the portion near the rotary shaft of the blade portion is appropriately scraped off, which requires extra labor and time.

The present invention solves the above problems, and an object of the present invention is to provide a screw type dryer capable of preventing an object to be dried from adhering to a specific place.

[0005]

In order to solve the above problems, a screw type dryer of the present invention is provided with a supply port for supplying an object to be dried at one end and an object to be dried at the other end. Is provided with a discharge port for discharging the material to be dried which passes through the inside thereof, and an external heating casing portion for heating the material to be dried, and an external heating casing portion fixed at an axial position along the longitudinal direction of the material to be dried passing through the outside thereof. The internal heating tubular portion to be heated, and the external heating casing portion and the internal heating tubular portion are rotatably arranged around the axial center position, and are rotated by a driving device so that the internal heating tubular portion is rotated from the supply port. It is provided with a ribbon-shaped screw that sends out the supplied material to be dried to the discharge port side.

[0006]

With the above structure, the internal heating tubular portion arranged at the axial center position is fixed to the external heating casing portion, and only the ribbon-shaped screw is rotated. Even when adhered, the adhered object to be dried is sent to the discharge port side by the ribbon screw while being heated and dried by the internal heating cylindrical portion, and is discharged from the discharge port.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially vertical front view of a screw dryer showing an embodiment of the present invention, and FIG. 2 is a vertical side view of an external heating casing portion of the screw dryer and its vicinity.

As shown in FIGS. 1 and 2, the screw dryer 1 has a supply port 2 to which the material to be dried a is supplied to one end side.
And an external heating casing part 4 provided with a discharge port 3 for discharging the material to be dried a on the other end side, and a concentric shape at a position of an axis X along the longitudinal direction of the external heating casing part 4. The inner heating tubular portion 5 fixed to the inner heating tubular portion 5 and the outer heating casing portion 4 and the inner heating tubular portion 5 are rotatably disposed about the axial center X position and are rotated by the drive device 6. The ribbon-shaped screw 7 that sends out the material to be dried a supplied from the supply port 2 to the discharge port 3 side by
And are provided.

The external heating casing portion 4 has a hollow structure having a substantially U-shaped cross section, and high temperature heat such as steam flowing into the chamber of the external heating casing portion 4 through a heating medium inlet 4a provided at a lower end of one end. The medium b heats and dries the material to be dried a sent along the inner surface of the external heating casing portion 4. In addition, 4b is an external heating casing part 4
Is a heating medium outlet provided at the lower end of the other end of the.

The upper surface of the external heating casing 4 is covered with a lid 8, and gas inlets and outlets 9 and 10 are provided at appropriate places, in this embodiment, both ends with respect to the direction of the axis X, and are heated. The gas component evaporated from the material to be dried a is released to the outside.

The internal heating tubular portion 5 fixed concentrically at the axial center X position of the external heating casing portion 4 has a tubular hollow structure and is internally fed through a heating medium inlet 5a provided at one end. The high-temperature heat medium c such as steam flowing into the heating tubular portion 5 heats and dries the material to be dried a sent along the outer peripheral surface of the internal heating tubular portion 5. In addition, 5b is a heating medium outlet provided at the other end of the internal heating tubular portion 5.

The ribbon screw 7 has a rotary ring portion 7a integrally formed at the base end thereof.
Bearing 1 fitted externally to the end of the internal heating tubular portion 5
It is rotatably supported via 2. Rotating ring part 7
A driven gear 11 is fixed to one end of a, and the driven gear 1
1 is meshed with the drive gear 13 fixed to the drive shaft of the drive motor 12 in the drive device 6, and the drive force of the drive motor 12 is the drive gear 13, the driven gear 11, and the rotary ring portion 7a.
It is adapted to be transmitted to the internal heating tubular portion 5 via the and to be rotated.

Further, the ribbon-shaped screw 7 is arranged so that the inner peripheral side thereof is closely arranged along the outer peripheral surface of the inner heating tubular portion 5, and the outer peripheral side is substantially outer peripheral to the inner peripheral surface of the outer heating casing portion 4. Although they are arranged close to each other along the surface, the outer peripheral side is slightly smaller than the inner peripheral surface of the external heating casing portion 4 at an appropriate position on the ribbon-shaped screw 7, that is, in the central portion with respect to the axial center X direction in this embodiment. A small diameter portion 7c having a small diameter is formed. And this small diameter portion 7c
A plurality of claws 7b are provided on the outer peripheral surface of the claw at appropriate intervals, and the claws 7b are configured to crush and stir the material to be dried a.

A gate 15 is provided at the discharge port 3 provided on the other end side of the external heating casing portion 4 and is retracted by a cylinder 14, and the gate 15 opens and closes the discharge port 3.

In the above-mentioned structure, the material to be dried a, which has been charged into the external heating casing portion 4 from the supply port 2, is sequentially sent to the discharge port 3 side by the ribbon screw 7. And
While being sent, it is heated and dried from both sides of the external heating casing part 4 and the internal heating tubular part 5.

In this case, not only the external heating casing portion 4 but also the internal heating tubular portion 5 is fixed in position, and only the ribbon screw 7 is rotated, so that the internal heating tubular portion 5 and the external heating casing 5 are rotated. Even if the material to be dried a adheres to the portion 4, the material to be dried a thus adhered is separated from the internal heating cylindrical portion 5 or the external heating casing portion 4 by the ribbon screw 7, and is heated and dried while the ribbon screw 7 is being dried. Is sent to the discharge port 3 side. Further, when being sent to the discharge port 3 side, the dried object a is crushed and stirred by the plurality of claw portions 7b provided on the ribbon screw 7.

As a result, the material to be dried a is reliably and efficiently heated and dried while being well dispersed in the external heating casing portion 4 without adhering to the internal heating tubular portion 5 or the external heating casing portion 4. . In addition, the opening degree of the discharge port 3 is adjusted by the gate 15 provided in the discharge port 3, and a desired dry state can be obtained.

For example, when the material to be dried a is sludge or sludge, a screw type dehydrator is provided in the preceding step of the screw type dryer 1 so that its water content is about 50%.
It is possible to dehydrate until it becomes, and by throwing the dried material a such as sludge and sludge dehydrated by the screw type dehydrator into the screw type dryer 1, the water content of the dried material a is about It can be dried to 30%. Thereby, the material to be dried a is sterilized well, and the fermentation of the material to be dried a can be stopped.

In the above embodiment, the case where the material a to be dried a is heated and dried by circulating the high-temperature heating mediums b and c such as steam in the inner heating cylindrical portion 5 and the outer heating casing portion 4, respectively. However, the present invention is not limited to this, and other drying heat sources, for example, electric heat may be generated. The ribbon-shaped screw 7 may be heated in addition to the internal heating tubular portion 5 and the external heating casing portion 4, and the material to be dried a may be heated and dried by the ribbon-shaped screw 7. As a means for heating the ribbon-shaped screw 7, a high-temperature heat medium such as steam may be passed or electrothermal heat may be generated. Further, in the above embodiment, the case where the discharge port 3 is provided at the end portion of the external heating casing portion 4 in the axial center X direction is shown, but it may be provided at a part of the outer heating surface of the external heating casing portion 4. Good. Further, the inner heating tubular portion 5 may be indirectly fixed instead of being fixed directly to the outer heating casing portion 4, so that the inner heating tubular portion 5 and the outer heating casing portion 4 are in a fixed state. It can be installed in.

[0020]

As described above, according to the present invention, the internal heating tubular portion arranged at the axial center position is fixed to the external heating casing portion, and only the ribbon screw is rotated. Even if the material to be dried adheres to the heating tubular portion, the material to be dried is heated and dried by the internal heating tubular portion, separated by the ribbon screw and sent out to the discharge port side. The product is surely heated and dried while being well dispersed. Moreover, since not only the external heating casing portion but also the internal heating tubular portion is used for heating, the drying capacity can be improved.

[Brief description of drawings]

FIG. 1 is a partially longitudinal front view of a screw dryer showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional side view of an external heating casing portion of the screw type dryer and a portion in the vicinity thereof.

[Explanation of symbols]

 1 Screw Type Dryer 2 Supply Port 3 Discharge Port 4 External Heating Casing Section 5 Internal Heating Cylindrical Section 6 Drive Unit 7 Ribbon Screw 7b Claws 15 Gate a Gates b, c High Temperature Heat Medium X Shaft Center

Claims (1)

[Claims] 1. An outside for heating an object to be dried passing through an inside thereof, a supply port for supplying the object to be dried is provided, and another end is provided with an outlet for discharging the object to be dried. A heating casing portion, an inner heating tubular portion fixed to an axial center position along the longitudinal direction of the outer heating casing portion, and heating an object to be dried passing outside thereof, the outer heating casing portion and the inner heating tubular portion. And a ribbon-shaped screw that is rotatably disposed around the axial center position and that is driven by a drive device to send the material to be dried supplied from the supply port to the discharge port side. A screw dryer characterized in that