JPH02255296A - Screw dehydrator - Google Patents

Abstract

PURPOSE:To prevent the corotation of hydrous cake around screw shafts and to improve a dehydration efficiency by providing a pair of the screw shafts having blades on a core shaft in a screw dehydrating cylinder for the hydrous cake and rotating these shafts in opposite directions. CONSTITUTION:Two pieces of the screw shafts 3, 3 having the blades 6 on the outer peripheries of the core shafts 5 are adjacently disposed in the dehydrating cylinder 2 in such a manner that the blades 6, 6, overlap on each other in the core shaft direction. The twisting directions of the two blades 6, 6 are set in the opposite directions and the blades 6, 6 are disposed in proximity to each other in an axial direction to form a partition part 14. The hydrous cake C is put into this dehydrating cylinder 2 and the screw shafts 3, 3 are rotated by a driving device 4 in the directions opposite to each other. The hydrous cake collides against each other in the adjacent part over the entire width in the axial direction of the screw shafts 3, 3 and interfere with each other so that the cake is advanced and moved while the corotation of the cake C on the other side of the collision is prevented from corotating around the screw shafts 3, 3. The hydrous cake is thus subjected to the dehydration treatment with the excellent dehydration effect.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a screw dehydrator for separating liquid juice and water from a water-containing cake, and is characterized by means for preventing the water-containing cake from being entrained in the dehydration cylinder.

[Conventional technology]

In a screw dehydrator, a rotating screw shaft is provided inside the dehydration cylinder, and dehydration is achieved by gradually reducing the inter-blade volume per pitch toward the outlet, as disclosed in, for example, Japanese Utility Model Publication No. 55-46395. It is.

[Problem to be solved by the invention]

Such a screw dehydrator is characterized by the ability to continuously process a water-containing cake, but due to differences in the physical properties of the raw material cake, such as the viscosity of the raw material cake and the adhesion of the cake to the screw shaft, dehydration may become impossible or the dehydration efficiency may significantly decrease. There was a problem in that the processing target was specified. For example, when dehydrating fruit cakes such as tangerines and apples using a screw dehydrator, the raw material cake remains attached to the screw shaft and rotates along with it, making it impossible to obtain forward force in the dehydration cylinder and dewatering becomes impossible. Sometimes it happened. Even if dehydration did not become impossible, there was a disadvantage that dehydration required a long time.

Therefore, the purpose of the present invention is to improve the dehydration efficiency by preventing the water-containing cake from moving around in the dehydration cylinder, and at the same time, to make it possible to dehydrate all kinds of raw material cakes regardless of the physical properties of the raw material cakes. You are on the way to getting a screw dehydrator.

[Means to solve the problem]

As illustrated in FIG.
3, and the outer surface of these screw shafts 3, 3 with blades 6,
6 and the screw shaft 3.
The screw shafts 3, 3 are arranged adjacently with their respective blades 6, 6 overlapping each other in the axial direction, and the blades 6 of the adjacent screw shafts 3, 3 are - The twisting direction of screw 6 is set in the opposite direction, and the drive mechanism 4 rotates each screw shaft 3 in the opposite direction.

The blades 6 and 6 of the adjacent screw shafts 3 and 3 are arranged so as to be close to each other in the axial direction in the adjacent portions, and both blades 6
・A partition portion 14 is formed between the six.

[Effect]

A plurality of adjacent screw shafts 3. - When the water-containing cakes C are fed into the dehydration cylinder 2 in step 3, the water-containing cakes C fed by the respective shafts 3, 3 collide and press against each other in adjacent parts across the entire axial width of the screw shafts 3, 3. Therefore, even if the water-containing cake C adheres to the screw shafts 3 and tries to rotate together, they interfere with each other in the adjacent portions, and each prevents the rotation of the water-containing cake C on the collision partner side.

Therefore, the water-containing cake C can be reliably moved forward along the screw shafts 3.

〔Effect of the invention〕

As explained above, in the screw dehydrator of the present invention, a plurality of screw shafts 3, 3 are provided in the dehydrating cylinder 2, and the screw shafts 3, 3 are arranged in a state where the respective blades 6, 6 are weighted together in the axial direction. are arranged adjacent to each other, and each screw shaft 3.
The mutual interference of the water-containing cake C fed in prevents the water-containing cake C from moving around, thereby ensuring its forward movement. Therefore, according to the present invention, even when the viscosity of the raw material cake or the adhesive strength to the screw shaft 3 is high, the water-containing cake C can be reliably squeezed and dehydrated, and various raw material cakes can be reliably dehydrated regardless of their physical properties. I can do it.

Adjacent blades 6 are brought close to each other in the axial direction to form a partition part 1.
4, the water-containing cakes C that are pressurized to the same degree can collide with each other, and the water-containing cakes C can be divided in the axial direction at adjacent parts, so that the water-containing cakes C can be easily separated when they interfere with each other. Escape in the axial direction can be prevented, and entrainment movement can be more effectively prevented.

(First Embodiment) FIGS. 1 to 4 show a first embodiment of a screw dehydrator according to the present invention.

In FIGS. 1 and 2, the screw dehydrator has a dehydrating cylinder 2 fixed to one side of a hopper chamber 1, and two screw shafts 3 arranged adjacently and in parallel extending from the hopper chamber 1 into the dehydrating cylinder 2. Both screw shafts 3 are connected to a drive mechanism 4.
can be rotated at the same time.

The screw shaft 3 consists of a core shaft 5 and a blade 6 fixedly wound around the outer surface of the core shaft 5 in a spiral manner. The end of the core shaft 5 on the inlet side is supported in a cantilevered manner by a bearing fixed to the left outer surface of the hopper chamber 1 by a unit 7.

Both adjacent screw shafts 3, 3 are connected so as to be rotatable in conjunction with each other via gears 8, 8 of the same diameter fixed to their respective shaft ends. It is rotated in the direction.

That is, the drive mechanism 4 uses a motor 9 as a drive source, and has a sprocket 10 fixed to its output shaft 9a, a sprocket 11 fixed to the outer end of one gear 8, and a sprocket wound around both sprockets 10 and 11. The chain 12 transmits rotational power to one screw shaft 3, and the other screw shaft 3 is further rotated in the opposite direction via gears 8.

The core shafts 5 and 5 of each of the screw shafts 3 and 3 have a tapered shaft shape in which the diameter of the feeding part 3a facing the hose par chamber 1 is small, and the diameter of the pressing part 3b facing the dehydration tube 2 gradually increases toward the outlet side. It is formed.

The winding of the blade 6 is fixed so that the outer diameter is the same over the entire length of the core shaft 5, and the winding is fixed so that the outer diameter is the same over the entire length of the core shaft 5.
It is twisted so that the winding direction is reversed.

When the outer diameter of the blade 6 is D, the distance P between adjacent screw shafts 3 is set smaller than the outer diameter (see FIG. 3). As a result, both screw shafts 3
- 3, the respective blades 6 are adjacent to each other in a state where they overlap in the axial direction.

In the plan view of FIG. 1, the screw shaft 3 is arranged so that the axially overlapping parts are close to each other in the axial direction without contact
・The blades 6 and 3 are arranged slightly offset in the axial direction, and both blades 6・
A partition portion 14 is formed adjacent to the portion 6.

The dewatering cylinder 2 includes a cylinder main body 15 and a filter screen 16 fitted to the inner surface of the cylinder body 15, and is formed as a cylinder with a cocoon-shaped cross section along the outline of both blades 6, 6, as shown in FIG. The filtration screen 16 is provided with fine holes throughout its entire surface, and the wall surface of the cylinder body 15 is provided with relatively large water passage holes 15a throughout its entire surface.

The reference numeral 17 in FIG. 2 is a cake discharge cylinder, and the reference numeral 18 is a hopper into which the raw material cake is charged.

Next, to explain the dynamics of the water-containing cake C in the dehydration cylinder 2, the raw material cake introduced into the hopper chamber 1 is sent by each screw shaft 3, and the dehydration cylinder 2 is filled. In this state, if the viscosity of the water-containing cake C is high or if its adhesive force is large, the water-containing cake C tends to rotate together with the screw shafts 3.

However, as shown in FIG. 4, the water-containing cakes C fed by the respective screw shafts 3, 3 collide and push against each other at the overlapping portions of the blades 6, 6.

Moreover, this mutual interference occurs over the entire range of the compressed portion 3b of the screw shaft 3. Therefore, the water-containing cake C is prevented from rotating and moves toward the exit side under the driving force of the blade 6.

At this time, adjacent water-containing cakes C are separated in the axial direction by the dehydration tube 2 and a partition portion 14 formed by the adjacent blades 6. Therefore, in each adjacent section, the squeezing pressures of the colliding water-containing cakes C become balanced, and when mutual interference occurs, the water-containing cakes C are prevented from escaping toward the other shaft side or axially toward the lower pressure side, thereby improving efficiency. Dehydrates well.

[Second Embodiment] FIG. 5 shows a second embodiment of the screw dehydrator according to the present invention, in which the core shaft 5 and the blades 6 are each formed into a tapered shape, and the dehydration tube 2 is also formed into a tapered shape. A similar tapered shape was formed to reduce the inter-blade volume toward the exit side.

[Third Embodiment] FIG. 6 shows a third embodiment of the screw dehydrator according to the present invention, in which the blade 6 in the first embodiment is
- The axial distance between the blades 6 and 6 has been changed, and the screw shafts 3 and 3 are arranged so that both blades 6 and 6 alternately face each other with a larger distance E in the adjacent portion.

[Another embodiment example]

The screw shafts 3 may be arranged adjacent to each other vertically or diagonally, or three or more screw shafts 3 may be arranged adjacent to each other along the same plane.

In each of the above embodiments, the twist directions of the blades 6, 6 of the adjacent screw shafts 3, 3 are reversed, and the driving rotation direction of each shaft 3, 3 is set in the opposite direction, so that the blades 6, 6 during rotation are set in opposite directions.
6, mutual interference is avoided, but this is not necessarily necessary. For example, the screw shafts 3 whose blades 6 are twisted in the same direction may be arranged adjacently, and the shafts 3 may be rotated in the same direction. Furthermore, each screw shaft 3 may have the same diameter of the core shaft 5 and the same outer diameter of the blades 6, and the pitch of the blades 6 may be made smaller toward the exit side.

[Brief explanation of drawings]

1 to 4 show a first embodiment of the screw dehydrator according to the present invention, FIG. 1 is a cross-sectional plan view, FIG. 2 is a longitudinal sectional front view, and FIG. 3 is an A in FIG. 1. - A sectional view and FIG. 4 are operation explanatory diagrams. FIG. 5 is a cross-sectional plan view showing a first embodiment of the screw dehydrator according to the present invention. FIG. 6 is a cross-sectional plan view showing a first embodiment of the screw dehydrator according to the present invention. 1... Hopper chamber, 2... Dehydration cylinder, 3... Screw shaft, 4... Drive mechanism, 5... Core shaft, 6... Blade, 14...・Partition section.

Claims (2)

[Claims] (1) Screw shafts 3 and 3 having blades 6 on the outer periphery of the core shaft 5, dewatering tube 2 that covers the outer surfaces of these screw shafts 3 and 3 along the outline of the blades 6 and 6, and screw shafts 3 and 3. and a drive mechanism 4 for rotationally driving the screw dehydrator, wherein the screw shafts 3 are arranged adjacent to each other with respective blades 6 overlapping each other in the axial direction. (2) The blades 6 of adjacent screw shafts 3 are arranged so as to be close to each other in the axial direction.
2. The screw dehydrator according to claim 1, wherein a partition part 14 is formed between the screw dehydrators.