JPH04118101U - Liquid supply dispersion device in vacuum belt dryer - Google Patents

Abstract

(57) [Summary] [Purpose] To make the film thickness of the liquid material uniform on the endless conveyor belt when drying the liquid material using a vacuum belt dryer, thereby promoting atomization of the final product. [Structure] The liquid material to be dried 9 supplied from the fixed discharge pipe 8 onto the endless conveyor belt 3 is forced and spread uniformly by leveling plates 10 arranged on the endless conveyor belt with an opposing interval L. Adjust to the desired thickness.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a feed liquid dispersion device for a vacuum belt dryer.

0002

[Conventional technology]

Drying of food and pharmaceutical ingredients formulated in liquid, slurry, or paste form A vacuum belt dryer is used as the drying device. Vacuum belt dryers are for example As shown in Japanese Patent Application Laid-open No. 63-148967, an endless conveyor belt is installed inside a vacuum container. , a first and second constant rate drying zone and a decreasing rate drying zone are located in the rotating region of this endless conveyor belt. In addition to sequentially arranging the cooling zone and the cooling zone, An oscillating raw material discharge nozzle is installed on the flow side, and the endless conveyor belt rotates accordingly. Constructed into a continuous drying device by installing a crusher device on the downstream side of the flow path. has been done.

0003

[Problem that the idea aims to solve]

By using the above-mentioned vacuum belt dryer, you can avoid problems with spray dryers and freeze dryers. The problem of soaring drying costs and changes in product solubility and composition will not be resolved. Although it is true, the swing-type raw material discharge nozzle requires a drive device, so the operation cost is low. In addition, the supply of raw materials onto the endless conveyor belt at the point of change of direction of the oscillating motion increases. It has been pointed out that the problem is that the amount of supply increases locally. dead center like this In order to eliminate poor dispersion of raw materials caused by the formation of The swing speed was changed along the width direction of the endless conveyor belt, and the swing trajectory was adjusted. This type of structure increases the complexity of the equipment and requires maintenance work. Another problem arises, which is that the work becomes difficult.

0004 Especially if the material to be dried is a thixotropic material such as a paint additive. In some cases, after vacuum drying, the particle surface area can be increased by atomization. unevenness in film thickness of the material to be dried when spread on the endless conveyor belt. is a major obstacle. In other words, even when the thick part of the film has not completely dried, When the thickness of a thin part is finished, the temperature of the part increases as the drying process ends. Paint additives tend to adhere to the surface of the conveyor belt and prevent atomization. The surface area of the additive becomes smaller.

[0005]

[Means to solve the problem]

As a means of solving the above problems, the present invention provides a liquid, slurry, or paste form. The mixed raw materials are fed onto an endless conveyor belt inside a vacuum container and dried. In the vacuum belt dryer, the raw material discharge pipe is located upstream of the endless conveyor belt. An endless conveyor belt is fixedly installed on the endless conveyor belt on the downstream side as seen from this raw material discharge pipe. with a predetermined spacing between the upper surface of the belt and the entire width of the belt. Liquid supply in a vacuum belt dryer characterized by a leveling board for raw materials It provides a dispersion device.

[0006]

[Effect]

Liquid, slurry, or paste is transferred from the opening of the discharge pipe onto the endless conveyor belt. Discharges the raw material of the shape. After this, the downstream side of the endless conveyor belt as seen from the above discharge pipe The thickly accumulated raw materials are spread out using leveling plates installed in the Distance between the lower edge of the flattening plate and the top surface of the endless conveyor belt Gives a film thickness equal to . The raw material whose film thickness has been made uniform in this way is transferred to an endless conveyor belt. The constant rate drying zone, decreasing rate drying zone, and cooling zone are sequentially moved by A product with a fine particle size that has been vacuum dried under specified temperature conditions. Finished in.

[0007]

【Example】

The vacuum belt dryer (1) consists of a vacuum container (2) maintained at a vacuum level of around 10 torr. ), an endless conveyor belt (3) is rotatably stretched and supported within the endless conveyor belt (3). ), from the upstream side to the downstream side, there is a first constant rate drying zone (4) and a second constant rate drying zone (4). rate drying zone (5), lapse rate drying zone (6), and cooling zone (7) in sequence. This arrangement constitutes continuous vacuum drying means. Endless conveyor belt ( 3) On the upstream side of the rotation path, multiple raw material discharge holes are aligned on the lower surface of the pipe wall. The raw material discharge pipe (8) is perforated with respect to the rotating direction of the endless conveyor belt (3). The pipes are fixedly installed so that they are substantially orthogonal to each other, and the downstream side when viewed from this raw material discharge pipe (8) On the endless conveyor belt (3), as shown in an enlarged view in FIG. ) with a predetermined facing distance L approximately equal to the film thickness of the raw material (9), and , a leveling plate (10) is provided so as to extend over the entire width direction of the endless conveyor belt (3). Install. An endless conveyor belt corresponding to the above-mentioned discharge pipe (8) and leveling plate (10) On the downstream side of the rotary path of (3), there is a crushing device for vacuum-dried raw materials (9). A pre-crusher (11) equipped with a shearing blade that moves up and down, and a mesh and rotating blade. A main crusher (12) consisting of a blade is provided. Leveling board (10) and the endless conveyor belt (3), depending on the type and characteristics of the material to be dried (9). Adjust accordingly. For this reason, the leveling plate (10) has adjustment screws etc. Equipped with an adjustment mechanism.

[0008] Vacuum drying agent for paint additives with thixotropic properties as shown in Table 1 below. The operating conditions and product characteristics of the device of the present invention will be explained based on an example.

[0009]

[Table 1]

0010 Table 1 above shows examples of vacuum drying using conventional equipment equipped with a swing-type discharge nozzle. They are also listed for comparison.

[0011]

[Effect of the idea]

The material to be dried (9) fed onto the endless conveyor belt (3) is leveled with a leveling plate (10). By damming, the upper surface of the endless conveyor belt (3) and the lower edge of the leveling plate (10) The film is spread to a constant film thickness that is approximately equal to the opposing spacing.

0012 By keeping the film thickness constant, the material to be dried (9) on the endless conveyor belt (3) An ideal drying condition is created where the drying conditions are uniform and no excess heat is involved in vacuum drying. maintained. As a result, the surface area of the material to be dried (9) increases during drying, resulting in less atomization. The result is a high quality product. In addition, the material to be dried is placed on the entire surface of the endless conveyor belt (3). (9) is spread, so the non-liquid supply space is reduced and the drying capacity is greatly improved.

[Brief explanation of drawings]

[Figure 1] Longitudinal cross-sectional view of a vacuum belt dryer

[Figure 2] Plan view of vacuum belt dryer

[Figure 3] Partially enlarged view of leveling plate and endless conveyor belt

[Explanation of symbols]

1 Vacuum belt dryer 2 Vacuum container 3 Endless conveyor belt 8 Raw material discharge pipe 9 Material to be dried 10 Leveling board

Claims (1)

[Scope of utility model registration request] Claim 1: In a vacuum belt dryer that supplies and dries raw materials prepared in the form of liquid, slurry, or paste onto an endless conveyor belt provided in a vacuum container, a dryer is provided in the upstream region of the endless conveyor belt. A raw material discharge pipe is fixedly installed on the endless conveyor belt on the downstream side as seen from the raw material discharge pipe, with a predetermined opposing interval between the top surface of the endless conveyor belt and the entire width of the belt. A liquid supply dispersion device for a vacuum belt dryer, characterized in that a leveling plate for raw materials is arranged.