JPH05253404A - Construction of antisticking for feed nozzle in vacuum drier - Google Patents

Abstract

PURPOSE:To completely prevent raw material from sticking to a feed nozzle in a vacuum drier not by a mechanical means. CONSTITUTION:The invention relates to the construction of antisticking for a feed nozzle 15 in a vacuum drier 1. In a device where raw material M is fed from the fed nozzle 15 to a raw material transfer device installed in a vacuum chamber 2 and is given drying treatment during raw material transfer, a fluid acting nozzle 18 faces the feed nozzle 15. Fluid or gas is jetted, dropped, flows down, etc., from fluid acting nozzle toward the feed nozzle 15 to scatter, dissolve or push adhering matter to let it flow. Thus the adhering matter is removed in the initial stage.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous vacuum dryer for continuously supplying a raw material into a vacuum chamber and heating and drying the raw material, and in particular, around a supply nozzle for supplying the raw material onto a raw material transfer device in the vacuum chamber. It is related to the structure.

[0002]

BACKGROUND OF THE INVENTION There is a continuous vacuum drying device as a device capable of continuously drying high-concentration and high-viscosity substances which are difficult to process with a spray dryer or the like. This product is equipped with a belt conveyor 5'in the vacuum chamber, to which the supply nozzle 1 is attached.
The raw material M is supplied from 5 ', and the raw material M is supplied by the belt conveyor 5'.
It is to dry while heating at a relatively low temperature during transfer. However, in such a device, since a raw material having a high viscosity or a highly viscous material such as a polymer dissolved in a solvent is a processing target, the raw material M adheres to the supply nozzle 15 ′ as shown in FIG. This can grow.

[0003] Such deposits form a lump and drop on the belt conveyor 5 ', and become an undried product as it is, or the supply state of the raw material M to the belt conveyor 5'is non-uniform, resulting in uneven drying. It has been a cause of problems such as the occurrence of.

As a means for preventing such adhesion, a method of mechanically scraping off the adhered material can be considered, but the adhesion and growth of the raw material on the scraping device itself poses a problem. Therefore, conventionally, the material of the nozzle was made of a material such as Teflon that does not adhere easily, and the nozzle position (height, angle, etc.) with respect to the belt conveyor was adjusted, but the material adhered during long-term operation. Growth could not be completely prevented.

[0005]

[Technical Items Attempted to Develop] The present invention has been made in view of such a background, and a fluid is made to act on an adhering substance without directly contacting the adhering substance to a supply nozzle. The present inventors have attempted to develop an adhesion preventing structure for a supply nozzle that can remove the adhering matter before it grows.

[0006]

[Constitution of the invention]

[Means for Achieving the Object] That is, in the first invention of the present application, the structure for preventing attachment of the supply nozzle in the vacuum drying device supplies the raw material from the supply nozzle to the raw material transfer device provided in the vacuum chamber to transfer the raw material. In the apparatus for performing a drying process on the above, a fluid action nozzle faces the supply nozzle.

In addition to the above requirements, the structure for preventing attachment of the supply nozzle in the vacuum drying apparatus according to the second aspect of the present invention is characterized in that the fluid action nozzle is provided so as to surround the outer periphery of the supply nozzle. It consists of These inventions are intended to achieve the above object.

[0008]

In the present invention, since the fluid action nozzle faces the supply nozzle, liquid or gas is jetted, dropped, or flown from the fluid action nozzle toward the supply nozzle to scatter, melt, or wash away the deposit. Thus, the deposit can be removed in the initial stage.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on the illustrated embodiments. Reference numeral 1 is a vacuum drying apparatus to which the present invention is applied, which mainly comprises a vacuum chamber 2 in which a cylinder whose both ends are sealed by a lid 3 is placed horizontally.

A closed chamber 4 is formed inside the vacuum chamber 2, and two closed belt conveyors 5 are provided in the closed chamber 4 as an example. An exhaust port 6 and a product discharge mechanism 7 are provided at the bottom.

The closed chamber 4 is divided into a steam heating zone 8, a hot water heating zone 9 and a cooling zone 10 from the starting end side of the belt conveyor 5, and in each zone, the raw material can be heated or cooled from the lower surface side of the belt conveyor 5. It has become. The heating of the steam heating zone 8 and the hot water heating zone 9 is performed using steam or warm water produced by heating the water in the water tank 11 provided outside.

Further, a raw material supply mechanism 12 is provided on the transfer surface starting end side of each belt conveyor 5. As shown in FIG. 2, the raw material supply mechanism 12 includes a swing shaft 13 connected to a swing arm mechanism 12a provided outside the chamber, an arm 14 and an arm 14.
The raw material supply pipe 14a is provided through the above, and the supply nozzle 15 is provided at the end thereof. Further, the supply nozzle 15 can perform zigzag movement by the swing of the arm 14 accompanying the reciprocal reversal of the swing shaft 13 and the piston movement of the air cylinder 16 attached to the arm 14. As a result, as an example, as shown in FIG. 3, the raw material M is supplied on the belt conveyor 5 in a zigzag-shaped trajectory almost evenly.

Next, the raw material supply pipe 14a is provided with a fluid supply pipe 17 in parallel with the raw material supply pipe 14a, and a fluid action nozzle 18 is provided at the tip thereof so as to face the supply nozzle 15 from above the supply nozzle 15. It is provided. In this embodiment, a thin tube made of Teflon (registered trademark) is used as the fluid supply pipe 17, and the tip of the thin tube is used as the fluid action nozzle 18 so that the liquid is dropped onto the supply nozzle 15. Further, on the outside of the fluid action nozzle 18, in the case where the fluid L is jetted from the nozzle, the cover 1 is provided to prevent the fluid L from being scattered and to protect the nozzle from radiant heat in the steam heating zone.
9 is attached. The fluid L supplied from the fluid action nozzle 18 can be appropriately selected depending on the type of the deposit, and may be a liquid such as water, hot water, a solvent for the deposit, or a gas such as air.

The fluid action nozzle 18 for causing the fluid L to act on the supply nozzle 15 is not limited to the above-mentioned embodiment.
Various forms can be adopted. That is, in the structure shown in FIG. 4, the fluid supply pipe 17 is made of metal, and the fluid action nozzle 18 is provided at its tip.
Is provided, and the liquid is jetted from this nozzle. In the case where the fluid action nozzle 18 is provided independently of the supply nozzle 15 including the above-described embodiment, the number of the fluid action nozzles 18 may be plural, and the direction thereof depends on the adhesion state of the raw material to the supply nozzle 15. The fluid action nozzle 18 may be in contact with the base of the supply nozzle 15 as shown in FIG.

Another embodiment shown in FIG. 6 is as follows.
A fluid action nozzle 18 is provided so as to surround the outer periphery of the supply nozzle 15 excluding the tip portion.
The liquid is made to flow down along the outer circumference of the supply nozzle 15 from 8. Of course, the liquid may be ejected also in such a structure. Further, in any of the structures described above, gas may be jetted instead of liquid. The injection form of the fluid L may be a continuous constant directional flow, a swirling flow, or an intermittent or shocking injection.

Next, the supply mechanism of the fluid supplied from the fluid action nozzle 18 will be briefly described by taking the case where the fluid L is water as an example. A storage tank 20 is provided on the outer peripheral portion of the vacuum chamber 2, and the other end of a pipe 21 extending from the bottom thereof is connected to the fluid supply pipe 17. In the middle of the pipe 21, a solenoid valve 2 whose ON / OFF is controlled by a timer 22 is provided.
3, and a needle valve 24 for performing precise flow rate control is provided downstream thereof.

When the method of dropping the solvent is adopted,
When the temperature of the solvent is high or when it contains gas, it may spray without dripping, so a cooling facility may be provided in the storage tank 20 or equipment for degassing under reduced pressure may be installed. It should be provided and dealt with.

The vacuum drying apparatus 1 to which the present invention is applied has the structure described above, and the operation state will be described below centering around the supply nozzle. First, each belt conveyor 5 is driven in a state where the sealed chamber 4 is maintained in vacuum.

In this state, the raw material M is supplied onto the belt conveyor 5 while moving the supply nozzle 15 so as to draw the locus shown in FIG. The raw material M is heated and dried on the way of being transferred by the belt conveyor 5, and becomes a foamed porous product, which is a product discharge mechanism 7
Recovered from.

In this way, the raw material M is supplied from the supply nozzle 15.
Is continuously supplied, the raw material M adheres to the vicinity of the tip of the supply nozzle 15 and grows with time. Therefore, for example, water is dropped from the fluid action nozzle 1 to dissolve the raw material M and wash the tip portion of the nozzle before the adhered state of the raw material M grows too much. The dropping interval may be appropriately adjusted depending on the type of the raw material and the adhesion state, and if necessary, it may be in a continuous flowing state. The same applies to the case of ejecting a liquid or gas from the fluid action nozzle 18.

[0021]

In the present invention, the fluid action nozzle 18 is made to face the raw material supply nozzle 15 to remove the deposits on the supply nozzle 15 by dropping, flowing or jetting the fluid. It is possible to surely remove the adhered substances without causing any trouble. Therefore, it is possible to carry out stable continuous drying without causing undried products and unevenness in drying to occur in the product.

[Brief description of drawings]

FIG. 1 is a schematic view showing a skeleton flow from a raw material supply to a product completion in a vacuum drying apparatus to which a supply nozzle adhesion prevention structure of the present invention is applied.

FIG. 2 is a vertical cross-sectional side view showing an enlarged part of a raw material supply side in a vacuum drying device.

FIG. 3 is a plan view showing a skeletal structure of a swinging arm mechanism of a supply nozzle.

FIG. 4 is a side view showing another embodiment in which the configurations of the fluid supply pipe and the fluid action nozzle are different.

FIG. 5 is a skeletal side view showing an embodiment in which a fluid action nozzle faces a root of a supply nozzle.

FIG. 6 is a perspective view showing an embodiment in which a fluid action nozzle is provided on an outer peripheral portion of a supply nozzle.

FIG. 7 is a skeletal side view showing the operating state of the same.

FIG. 8 is a skeletal side view showing a problem in the conventional vacuum drying apparatus.

[Explanation of symbols]

 1 Vacuum Dryer 2 Vacuum Chamber 3 Lid 4 Sealing Chamber 5 Belt Conveyor 6 Vacuum Exhaust Port 7 Product Discharging Mechanism 8 Steam Heating Zone 9 Hot Water Heating Zone 10 Cooling Zone 11 Water Tank 12 Raw Material Supply Mechanism 12a Swing Arm Mechanism 13 Swing Shaft 14 Arm 14a Raw material supply pipe 15 Supply nozzle 16 Air cylinder 17 Fluid supply pipe 18 Fluid action nozzle 19 Cover 20 Storage tank 21 Piping 22 Timer 23 Solenoid valve 24 Needle valve L Fluid M Raw material

Claims (2)

[Claims] 1. An apparatus for supplying a raw material from a supply nozzle onto a raw material transfer device provided in a vacuum chamber and performing a drying process during the transfer of the raw material, wherein the supply nozzle faces a fluid action nozzle. A structure for preventing attachment of a supply nozzle in a vacuum dryer. 2. The adhesion preventing structure for a supply nozzle in a vacuum dryer according to claim 1, wherein the fluid action nozzle is provided so as to surround an outer periphery of the supply nozzle.