JPS6046907A - Production of dry ice having definite form - Google Patents

Abstract

PURPOSE:To provide the titled compact apparatus giving a uniform and dense dry ice in high workability, by placing an air-permeable wall and a barrier wall alternately at the top opening part of a forming chamber, and placing a ram at the bottom of the chamber to press the fluffy dry ice upward. CONSTITUTION:An air-permeable wall 4 of the lid 6 is attached to the top-opening 3 of the forming chamber 2 having opened top 1, and liquefied carbon dioxide is ejected through the nozzle 10 attached to the bottom of the chamber 2. The formed fluffy dry ice is preliminarily pressed between said permeable wall 4 by ascending the ram 7 with hydraulic cylinder 8. The barrier wall 5 of the lid 6 is shifted to the top opening 3 by the hydraulic cylinder 30, and the dry ice is pressed between the barrier wall 5 and the ram 7. The barrier wall 5 is retreated, the ram 7 is lifted to the top, and the solid dry ice is pushed out through the sliding path 11 and the opening 27 by the action of the pushing arm 14 operated by the cylinder 30.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shaped dry ice production apparatus that compacts snow-like dry ice into a predetermined shape using a ram in a forming chamber.

Conventionally, there is an apparatus for manufacturing regular shaped dry ice, as shown in FIG.

That is, the ram 7 is positioned at the top of the closed molding chamber 2,
A cylinder 8 is driven vertically and slidably within the molding chamber 2, a plurality of gas vent holes 50 are opened above the molding chamber to suppress pressurization of carbon dioxide gas, and a horn 51 is installed below the gas vent holes 50. A nozzle 1o is installed to spout liquefied carbon dioxide gas.
is provided within the bone 51.

liquefied carbon dioxide gas from the above nozzle 1o through the horn 51
When the carbon dioxide gas is injected into the mold, the liquid carbon dioxide gas flows into the molding chamber 2 and undergoes adiabatic expansion to generate snow-like dry ice.

Further, the increase in gas pressure caused by sublimation of the snow-like dry ice is removed through the gas vent hole 5o, while the snow-like dry ice is compressed by the ram 7 and compacted into regular-shaped dry ice.

However, since the snow-like dry ice cannot be compressed at the position where the gas vent hole 5o is formed, the stroke of the molding chamber 2 and the sill 8 must be improved by the amount of the gas vent hole, and the height of the device is reduced. It gets bigger and the whole thing becomes bulkier.

Further, since the snow-like dry ice generated in the molding chamber 2 is easily guided by the outflowing gas, it accumulates more densely around the force relief hole 50, and only at a lower density in the lower part of the molding chamber. Moreover, the closer the ram 7 is, the higher the compression efficiency becomes, so when compressed by the ram, regular dry ice with low density is produced at the bottom, and the quality of all the tri-ice is not uniform.

Moreover, the regular shaped dry ice that has come out has to be taken out by pushing down the lower lid 52 of the molding chamber 2.
If the extraction position is low and requires manual labor, the operation must be repeated while bending over, resulting in extremely low work efficiency.

Furthermore, since the ram 7 located on one side of the molding chamber 2 is operated by a hydraulic cylinder 8, there is a risk that oil may fall into the molding chamber and mix into the dry ice during the production of dry ice. Particularly when dry ice is used to cool food products, impurities in the dry ice are unfavorable from the viewpoint of food hygiene.

Moreover, since the molding chamber 2 is of a closed type, there is a drawback in that the scrap dry ice that has been taken out cannot be reintroduced into the molding chamber to be recycled.

Furthermore, as an international problem, dry ice thinner than 25.-30111111 could not be manufactured.

The present invention is intended to solve the above-mentioned problems, and its main purpose is to make dry ice high-density and homogeneous, and to make the device compact and improve workability.

In order to achieve this objective, the present invention is constructed as follows.

First, it is equipped with a molding chamber whose upper end is completely open, and a ventilation wall that covers one end of the molding chamber and a wall connected to one side of the molding chamber.
, and a lid wall consisting of a sealing wall. Then, the lid wall is displaced to an in/- formation position where the ventilation wall covers the upper end opening, a molding position where the sealing wall covers the upper opening, an opening position where the binary opening is opened, and a third position. A drive device is provided.

In addition, a ram is positioned at the bottom of the molding chamber, and two lower slides are driven simultaneously within the molding chamber by a sill, and a nozzle that spouts liquefied carbon dioxide upward from the lowest position of the ram is installed at the bottom of the molding chamber. It was established.

Hereinafter, embodiments of the present invention will be explained based on the drawings.

Figure 1 is a longitudinal cross-sectional front view of the foot-shaped dry ice manufacturing equipment, Figure 2
5 to 5 are schematic longitudinal sectional front views of the same apparatus for each manufacturing process, with the upper end surface 1 of the vertical dry ice molding chamber 2 completely open, and the horizontal direction along this upper end surface 1. sliding passage 1
form 1.

The upper end of the molding chamber 2 is covered with a recovery chamber 12 via a sliding passage 11, and a recovery line 3 is led out from the recovery chamber 12.

Then, a lid wall 6 in which a porous ventilation wall/1 and an airtight sealing wall 5 are connected from side to side is slidably inserted into the sliding passage 11, and the upper end opening 3 of the molding chamber 2 is slidably inserted. is opened and closed by the cover wall 6 as follows.

That is, a hydraulic cylinder 3o is arranged on the left side of the molding chamber 2, and the cylinder 30 closes the lid wall 6, and the ventilation wall 4 closes the binary opening 3.
Snow forming position A (Figs. 2 and 3) where the sealing wall 5 covers the upper end opening 3 (Fig. 4), and opening position C (Fig. 4) where the upper end opening 3 is opened. 5) and 1), the upper end opening 3 is opened and closed by the lid wall 6.

A dry ice extrusion arm 14 is provided on the right side of the sealing wall 5, if necessary.

Furthermore, a hydraulic cylinder 8 is provided at the bottom of the molding chamber 2 to drive the ram 7 downward. This sill 8 allows the ram 7 to slide downward from the bottom wall 15 of the molding chamber 2 to a position slightly above the upper end opening 3.

Then, one nozzle 1() for liquefied carbon dioxide gas is arranged in a left-right opposed manner at the bottom of one of the molding chambers from the lowest position of the ram 1).

That is, a recess] 7 is formed in the side wall 16 of the molding chamber 2, and a glue 10 is made to protrude from the center of the four parts. /Iy
The valve 18 is connected to the nozzle 1 ( ) to the liquefied carbon dioxide gas supply source 2 .

On the other hand, a recovery line 13 led out from the recovery chamber 12 above the molding chamber includes a compressor 2], a dehumidification tower 22, a deodorization tower 23,
The condensers 24 are connected in sequence and connected to a high liquefied carbon dioxide supply line 26 via an operating valve 25.

If necessary, a conveyor 26 is disposed near the right end opening 2 ?j of the sliding passage 11, and the regular dry ice extruded from the right end [127] is placed on the conveyor 26 and transferred.

Furthermore, both the side wall 16 of the molding chamber and the upper surface 7a of the ram 7 are coated with a polytetrafluoroethylene film to improve lubrication performance.

To explain the function of this apparatus, first, as shown in FIG. )
At the same time, the already manufactured regular-shaped dry ice is pushed out into the sliding passage 11 by the push-out arm 14 at the right end of the lid wall 6.
between the right ends of ``] 27 to the conveyor 26.

Then, liquefied carbon dioxide gas is injected into the molding chamber through the injection nozzle 1o to generate snow-like dry ice through adiabatic expansion.

In addition, the snow-like dry ice generated at this time is stored in the molding chamber 2.
It is concentrated more densely around one ventilation wall 4.

Next, especially when forming thin plate-like regular dry ice, as shown in FIG. 3, the hydraulic cylinder 3 is operated to raise the ram 7 to create an air vent where more snow-like dry ice is concentrated. The dry ice is preformed by pressing the ram 7 against the wall 4.

At this point, the carbon dioxide vapor accompanying the sublimation of the snow-like dry ice escapes to the collection chamber 12 through the ventilation wall.
The resistance to compression of dry ice is reduced, and smooth compression can be achieved.

Of course, the recovery line 13 is activated at the stage shown in FIG.
It is also possible to form snow-like dry ice and recover excess carbon dioxide gas at the same time, omitting the third and first steps.

Furthermore, as shown in FIG. 4, the sealing wall 5 is positioned at the upper end opening 3 of the molding chamber by operating the sill 30 (molding position B), and the pre-pressed dry ice is strongly compressed in the closed system. Press into regular dry ice.

Next, as shown in FIG. 5), actuate the sill 30 to release the lid wall 6 from the upper end opening 3 along the sliding passage 11 to the opening position C), and move the ram 7 upward to its 1st limit. position the regular-shaped dry ice in the sliding passage 11, slide the lid wall 6 to the right, and move the regular-shaped dry ice to the right end opening 27 of the sliding passage 11 with the push-out arm 14, and then remove the lid. Return the wall 6 to the snow formation position A.

By repeating such a cycle, regular-shaped dry ice is mass-produced.

In the embodiment described above, the lid wall 6 is slid linearly with respect to the upper end opening of the molding chamber 2, but as shown in FIG. Alternatively, the upper end opening 3 of the molding chamber may be closed off by the sealing wall 4 and the ventilation wall 5, or may be opened.

As shown in the above, the present invention provides a displacement driving mechanism for displacing and driving a lid wall, which is connected to a ventilation wall and a sealing wall, between one end of the molding chamber.
The ram is slid by a sill set at the bottom of the molding chamber, and a liquefied carbon dioxide injection nozzle is installed above the lowest position of the ram and below the molding chamber, resulting in the following effects: play.

First of all, compared to the conventional example, there is no force vent hole, so no space is required for gas venting, and since liquefied carbon dioxide gas is ejected into the molding chamber to form snow-like dry ice, it is possible to create snow-like dry ice. The entire device can be made smaller in size compared to conventional devices that have a snow formation chamber for ice formation.

In addition, when forming dry ice, the density of the snow-like dry ice increases at the lid wall located far from the ram, so when compacting it with the ram, the density is increased not only near the ram but also at the lid wall. It is compacted to a high density, resulting in a dense and homogeneous product.

Furthermore, the dry ice produced in the molding room 2 is
Since it is taken out from 1 between the ends, the extraction position is high, for example 7
It can be obtained from a take-out position that is accessible to 50 to 850 man workers, improving work efficiency.

Furthermore, since the sill that operates the ram is located below the molding chamber, oil does not fall down and mix into the molding chamber during dry ice production, unlike in conventional methods, and the purity of dry ice is maintained at a high level. It can also be used safely, especially for cooling food, since it eliminates hygiene problems.

Moreover, since the upper end surface of the molding chamber is completely open, it is possible to easily regenerate the deflated dry ice into regular-shaped dry ice by reintroducing the deflated dry ice once removed into the molding chamber through the opening.

Furthermore, with this device 1, even a small amount of snow-like dry ice can be formed in a high yield in the molding chamber.
It is also possible to produce extremely thin dry ice of less than 0.

[Brief explanation of the drawing]

1 to 6 show embodiments of the present invention, in which FIG. 1 is a longitudinal sectional front view of a regular-shaped dry ice manufacturing apparatus, and FIGS.
The figure is a suggested longitudinal sectional front view of the same device for each manufacturing process,
Fig. 2 shows the snow injection process, Fig. 3 shows the snow forming process, Fig. 4 shows the dry ice process, Fig. 5 shows the dry ice removal process, and Fig. 6 shows another example of manufacturing shaped dry ice. The implied plan view of the device, FIG. 7, is a diagram corresponding to FIG. 1 showing a conventional example. DESCRIPTION OF SYMBOLS 1... Upper end surface, 2... Molding chamber, 3... Upper end opening of 2, 4... Ventilation wall, 5... Sealing wall, 6... Lid wall,
7... Ram, 8... Cylinder, 10... Nozzle,
A...In/-forming position, B...molding position, C...
Opening position, D...7 lowest position. Patent applicant: Iwatani Sangyo Co., Ltd.

Claims (1)

[Claims] 1. A molding chamber 2 with the upper end surface 1 completely open, and a lid wall 6 consisting of a ventilation wall 4 covering the upper end opening 3 of the molding chamber 2 and a sealing wall 5 connected to one side of the ventilation wall 4. The lid wall 6 is placed in three positions: a snow forming position A where the ventilation wall 4 covers the top opening 3, a forming position B where the sealing wall 5 covers the top opening 3, and an opening position C where the top opening 3 is open. Drive device 30 for displacement
A ram 7 is inserted into the molding chamber 2 so as to be able to slide up and down, and a sill 2 is provided to drive the ram 7 outwardly. A shaped dry ice production device characterized by being provided with a nozzle 10 that spouts carbon dioxide gas.