JPH0761805A - Apparatus for producing granular dry ice - Google Patents

Abstract

PURPOSE:To simply and surely obtain granular dry ice by forming molding holes for the dry ice at the tip of a cylinder into a tapered shape of spreading toward the outside of the cylinder. CONSTITUTION:This apparatus for producing dry ice is obtained by constructing a cylindrical cylinder 1, a piston, advancing, retreating and moving in the cylinder 1, a hydraulic driving device for driving the piston, a mold metallic fixture 4 and a cylinder tip flange 5, etc., at the tip of the cylinder 1. Many dry ice molding holes 6 formed into a tapered shape of spreading toward the tip are bored in the mold metallic fixture 4 of the apparatus. Liquid gaseous carbon dioxide is then jetted into the interior of the cylinder 1 to compact the produced snow dry ice between the piston and the mold metallic fixture 4 and extrude the compacted snow dry ice from the molding holes 6 into a slender rodlike form. Thereby, the granular dry ice is produced at 170-180kg/hr rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing dry ice, and more particularly to an apparatus for producing granular dry ice.

[0002]

2. Description of the Related Art Generally, dry ice is formed in a block shape, but the block dry ice is used by cutting or breaking it into an appropriate size. Hard to get. Further, since the variation in the size of the dry ice block greatly affects the cooling capacity, there is a problem that it is difficult to set an accurate cooling capacity, and the shape of the object to be cooled is not familiar. There was also a problem that it was difficult to perform uniform cooling. Further, since the dry ice is block-shaped, it is troublesome to handle it.

On the other hand, it is also possible to use dry ice in a snow shape without solidifying it. In this case,
There was also a problem that the required amount of dry ice was sublimed quickly and snow-like dry ice could not be cooled for a long time. Therefore, granular dry ice is provided that can be easily handled, can be reliably weighed, and has a long cooling duration.

As a conventional apparatus for producing this granular dry ice, there is one shown in FIG. This device is a small-diameter rod-shaped product that pushes dry ice snow generated by ejecting liquid carbon dioxide into a cylinder (52) with a large number of molding holes (51) formed at the tip by the operation of a piston (53). This dry ice was extruded, and the extruded small-diameter rod-shaped dry ice was cut with a rotary cutting tool (54) to form granular dry ice.

[0005]

However, in the conventional granular dry ice manufacturing apparatus, since the molding hole (51) formed at the tip of the cylinder (52) is formed in a taper, a large extrusion pressure is required. In addition to the above, the rod-shaped dry ice extruded from the cylinder is surely compacted, so that it does not become granular as it is and requires a crushing means such as a cutting tool. For this reason, the conventional granular dry ice production apparatus has to be equipped with a cutting means as well as an extrusion means, which causes a problem that the granular dry ice production apparatus becomes complicated. The present invention has been made in view of these points, and an object thereof is to provide an apparatus capable of reliably producing granular dry ice with a simple apparatus.

[0006]

In order to achieve the above-mentioned object, the present invention is characterized in that a dry ice forming hole provided at the tip of a cylinder is formed in a taper that is divergent toward the outside of the cylinder.

[0007]

According to the present invention, since the dry ice forming hole provided at the tip of the cylinder is formed in a taper shape that spreads toward the outside of the cylinder, the base end portion of the forming hole has the smallest opening cross-sectional area and is extruded. The density of the dry ice is determined only by the opening cross-sectional area at the base end. As a result, the density of the rod-shaped dry ice becomes coarser than that of the rod-shaped dry ice in the tapered tapered forming hole, and immediately after being squeezed, the cross-sectional area of the passage expands and the restraining force is released. It expands to remove the cracks and cracks occur from the rod surface to the inside. The part that exits the forming hole breaks due to its own weight, and the impact when dropped causes it to break from this cracked part, producing granular dry ice.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of the present invention. FIG. 1 is a partially cutaway perspective view of a granular dry ice manufacturing apparatus, and FIG. This granular dry ice manufacturing apparatus is composed of two cylindrical cylinders (1) placed horizontally and a hydraulic drive unit (3) for driving a piston (2) that moves in and out of each cylinder (1). The mold (4) is attached to the tip of the cylinder (1).

As shown in FIG. 2, the metal mold (4) has a convex cross section, and the small diameter portion of the metal mold (4) is fitted in the tip of the cylinder (1) so that the flange (5) of the cylinder tip is present. It is attached and fixed to. Further, a large number of dry ice forming holes (6) formed in a tapered shape are formed in the mold fitting (4) in a transparent manner.

The piston (2) which moves in and out of the cylinder (1) is separated from the inner end surface of the mold (4) by 30 when the pushing operation is performed.
The stroke is set so as to leave a space of about 50 mm. As a result, the tip of the piston (2) and the metal mold are
The snow dry ice produced by ejecting liquid carbon dioxide gas into the cylinder (1) between (4) and (4) is once hardened and pushed out from the molding hole (6) in the form of a thin rod.

Two cylinders (1) arranged in parallel
Is configured to blow dry carbon dioxide gas into the other cylinder (1) while the extrusion operation is performed in the one cylinder (1) to generate dry ice snow. Further, in FIG. 1, reference numeral (7) is a passage for introducing liquid carbon dioxide into the cylinder (1), (8) is a passage for discharging vaporized carbon dioxide from the cylinder (1),
(9) is a hydraulic oil supply / discharge passage of the hydraulic drive system (3).

In the dry ice producing apparatus thus constructed, the snow dry ice produced in the cylinder (1) is pushed out in the form of a rod. At this time, since the dry ice forming hole (6) is formed in a tapered taper with the base end portion being most narrowed, the extruded rod-shaped dry ice is externally applied only at the starting end portion of the forming hole (6). The binding force is received, and the binding force from the outside is not received in other parts of the molding hole (6). For this reason, the diameter of the rod-shaped dry ice expands due to open strain while passing through the molding hole (6), and is extruded with fine cracks on the surface.

Since the extruded rod-shaped dry ice is supported in a cantilever manner at the inner end of the molding hole (6), a downward bending force based on its own weight is exerted from the stage of exiting the molding hole. As a result, as shown in FIG. 2, the rod-shaped dry ice breaks into an appropriate length from the cracked portion and falls. Then, when it is dropped, it is further crushed from the cracked portion, and the length becomes almost the same size as the diameter, resulting in granular dry ice.

Then, the granular dry ice thus formed and the conventional granular dry ice formed by cutting with a cutter the rod-shaped dry ice produced by passing through a molding hole having a tapered taper Was used to determine the hardness of the dry ice by blasting each of the dry ice particles together with compressed air and determining the hardness of the dry ice according to the open state of the blasted object, but there was no great difference between the two.

Further, when the tapered hole having the tapered shape is used, the production amount is about 25 to 30 kg / h,
The amount produced when using a taper hole with a divergent taper is 1
It was 70 to 180 Kg / h, and about 6 times as much production amount was obtained. This is because the taper of the tapered taper gradually increases the resistance by sequentially compacting, whereas the taper of the taper taper increases the resistance when passing through the molding hole only by drawing at the base end. It seems that it is due to not having.

[0016]

According to the present invention, since the molding hole of the metal mold attached to the tip of the cylinder is formed in the taper of the tapered end, the dry ice formed in the rod shape in the molding hole is the base of the molding hole. The restraint force is removed in a state where it exceeds the end portion, and cracks are formed on the surface due to open strain. In addition, the rod-shaped dry ice extruded from the molding hole is cantilevered, so if it is extruded to a certain length it will break under its own weight and will be crushed from the cracks (cracks) on the surface of the rod-shaped dry ice due to the impact of falling. It becomes granular. As a result, it is possible to generate granular dry ice with a simple mechanism using only the extrusion device without using a crushing mechanism such as a cutter.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of an apparatus for producing granular dry ice.

FIG. 2 is an enlarged view of a main part of the granular dry ice manufacturing device.

FIG. 3 is a schematic view showing a conventional device.

[Explanation of symbols]

 1 ... Cylinder, 6 ... Molding hole.

Claims (1)

[Claims] 1. Dry ice formed so as to form linear dry ice by extruding dry ice snow formed by ejecting liquefied carbon dioxide into a cylinder (1) through a forming hole (6) formed at the tip of the cylinder. In the manufacturing apparatus, the dry ice molding hole (6) provided at the tip of the cylinder (1) is formed in a taper that spreads toward the outside of the cylinder.