JP4056908B2 - Anti-condensation device for bulk vehicles for powder transportation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
When loading bulk powder containing moisture, such as milled flour, into bulk car tanks when the outside air temperature is low, such as in winter, the bulk car's Since the tank is cooled, water vapor generated from the powder condenses due to the temperature difference between the temperature of the tank cooled by the outside air and the temperature of the bulk powder containing moisture. Condensation may occur on the wall. The present invention relates to a dew condensation prevention device for a bulk vehicle for powder transportation for preventing this dew condensation.
[0002]
[Prior art]
When transporting moisture-containing bulk powder, for example, edible powder such as milled flour (hereinafter described by taking wheat flour as an example) from a mill to a customer's processing plant such as a bakery In the past, the flour was packed in a 25kg bag, etc., and then the packaged flour was transported by truck, but in recent years it has been packed mainly by customers who purchase large quantities. There is an increasing number of cases in which wheat flour is loaded and loaded in an on-board tank of a tank truck while being in bulk form, and the flour loaded on the on-board tank is transported. A tank truck that transports such bulk powder is referred to as a bulk vehicle.
[0003]
This bulk car transport allows you to transport the flour without bagging and deliver it directly to the silo (storage tank) of the customer's processing plant. In addition to the fact that it can be transported, the bagging process at the flour mill and the removal work from the bag at the customer's processing plant are no longer necessary, and the transportation cost can be greatly reduced. It is about 50% of the amount of flour transported.
[0004]
The bulk vehicle for transporting the bulk flour is, for example, a bulk vehicle 80 as shown in FIG. 9, and the vehicle is loaded with the flour on a vehicle-mounted tank 82 (hereinafter simply referred to as a tank 82) of the bulk vehicle 80. To do. In this figure, both the method of putting flour into the tank 82 of the bulk car 80 at the mill and the method of discharging flour at the customer's factory are drawn at the same time.
[0005]
That is, when the flour is put into the bulk car 80 at the mill, for example, the flour milled at the mill is conveyed to the second floor as a loading place, and the tank 82 of the bulk car 80 parked on the first floor is bellows-like. It is carried out by putting wheat flour into the tank 82 of the bulk car 80 by allowing it to fall naturally through the transport tube 84.
[0006]
During the loading operation of the flour, the flour is introduced from the two hatches 86a on both sides provided on the upper surface of the tank 82 of the bulk car 80 by, for example, two bellows-shaped transfer tubes 84, and the center The hatch 86b (one or two) is opened and used to wind the air sent with the flour.
[0007]
In addition, when the flour is discharged into the silo at the customer's factory, it is carried out by pneumatic transportation from the rear discharge port 88 through the conveyance tube 90, and the front part of the tank 82 is pushed up by the hydraulic cylinder 92 so that the tank 82 is removed. By tilting, the flour can be completely discharged from the rear outlet 88.
[0008]
The wheat flour immediately after being milled has a temperature of about 25 ° C. and a vapor pressure that equilibrates when the relative humidity of the surrounding air is about 70%. This means that the air introduced together with the wheat flour has a temperature of about 25 ° C. and the relative humidity at this temperature is about 70%, and the moisture from the flour is maintained so as to maintain the absolute humidity of this air. This indicates that moisture is absorbed or absorbed, and when air temperature and humidity fluctuate due to factors such as outside air temperature, heat and moisture are supplied from the flour to prevent fluctuations in air temperature and humidity become.
[0009]
Therefore, when the flour immediately after milling is loaded into the tank 82 of the bulk car 80 and loaded, the air charged into the tank 82 together with the flour has a temperature of about 25 ° C. and a relative humidity of about 70%. After that, the temperature in the tank 82 is equilibrated at a temperature of about 22 ° C. to 23 ° C. as the flour is cooled.
[0010]
On the other hand, the tank 82 of the bulk vehicle 80 is generally made of aluminum. As is well known, aluminum has a high thermal conductivity and is easily in thermal equilibrium with the temperature of the surrounding air, so it is a bulk that travels in the outside air or stops and stands by in the outside air. The tank 82 of the car 80 is cooled by the outside air at 0 ° C. or lower in the winter, and the temperature of the aluminum tank 82 that has high thermal conductivity and is easily cooled, and the tank 82 is charged into the tank 82. There will be a large temperature difference with the temperature of the flour.
[0011]
Thus, since there is a large temperature difference between the temperature of the tank 82 of the bulk car 80 and the temperature of the flour to be charged, the air charged with the flour is rapidly cooled on the inner wall surface of the tank 82. Then, dew condensation occurs on the inner wall surface of the tank 82 and water droplets are generated. As a result, the flour loaded in the tank 82 adheres to the water droplets condensed on the inner wall surface of the tank 82, and the flour in the form of lumps or flakes adheres to the inner wall surface of the tank 82.
[0012]
This lump or flake flour must be washed and removed after the flour is discharged into the silo at the customer's factory, but this lump or flake flour, especially once dried and solidified flour It was not easy to remove the water with water, and it was unexpectedly troublesome.
[0013]
[Problems to be solved by the invention]
The present invention has been made in view of such circumstances, and the object of the present invention is to solve the above-described problems, and in winter, etc., bulk powder containing moisture such as flour in a bulk car When loading the body, condensation is prevented from forming on the inner wall surface of the tank and water droplets are prevented from adhering to the inner wall surface of the tank. An object of the present invention is to provide a dew condensation prevention device for a bulk vehicle for powder transportation, which can save the trouble of removing the dry powder adhered to the wall surface.
[0014]
[Means for Solving the Problems]
In order to solve these problems, a dew condensation prevention device for a powder transport bulk vehicle according to the present invention provides a supply of the powder in a bulk vehicle having a tank on which moisture-containing bulk powder is loaded. An anti-condensation device for a bulk vehicle used for loading the powder to prevent dew condensation that occurs when the tank is originally loaded on the tank using a transfer tube, wherein the air around the tank an air supply device for supplying to the interior, an air delivery device for delivering along the inner wall surface of the tank the air supplied by the air supply device and an air discharge unit for discharging the air in the tank to the outside The air delivery device is installed in a hatch provided on the upper surface of the tank, and the air supplied by the air supply device is radially arranged in a lower portion of the air delivery device. It is characterized in that the delivery nozzle for delivering is disposed.
[0015]
Here, the air delivery device is a double tube, the air supply device is connected to an outer tube, the delivery nozzle is disposed at a lower portion of the outer tube, and the air discharge device is connected to an inner tube. it is not preferable that is. Further, the air delivery device is a double tube, the air supply device is connected to an outer tube, the delivery nozzle is disposed at a lower portion of the outer tube, and the powder is supplied to the inner tube. It is preferable that the conveyance tube is connected. In addition, it is also preferable that the air delivery device is an existing ventilation pipe installed at the rear upper part of the tank.
[0016]
The air supply device is preferably provided with a filter on the upstream side and the downstream side of the fan, and the fan is preferably a ring blower. The air supplied by the air supply device is preferably outside air.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a dew condensation prevention device for a bulk vehicle for powder transportation according to the present invention will be described based on preferred embodiments shown in the accompanying drawings. FIG. 1 is a partial cross-sectional front view showing an example of a powder loading device employing the dew condensation prevention device for a powder transport bulk vehicle according to the present invention, and FIG. 2 is an air feed in the powder loading device of FIG. FIG. 3 and FIG. 4 are enlarged views of part A of FIG. 2, FIG. 5 is a sectional view taken along line BB of FIG. 4, and FIG. FIG. 7 is a sectional view showing the details of the air delivery device in the powder loading device of FIG. 6, and FIG. 8 is a powder of the present invention. It is the front view made into the partial cross section which shows the 3rd example of the powder loading apparatus which employ | adopted the dew condensation prevention apparatus of the bulk vehicle for body transportation.
[0018]
FIG. 1 is a front view showing an example of a powder loading apparatus employing a dew condensation prevention device for a powder transport bulk vehicle according to the present invention. A tank 12 for loading flour, which is a bulk powder containing moisture, is provided at the upper part of the body of the bulk vehicle 10 for transporting powder, and the flour is loaded on the upper surface of the tank 12 for loading. Three or four hatches 14 are provided. The hatch 14 is used for loading flour, and in the powder transport bulk vehicle 10 of this embodiment, as in the powder transport bulk vehicle 80 shown in FIG. As shown by the thick arrows, the flour is introduced from the two hatches 14 a by the two bellows-shaped transfer tubes 16 and accumulated in the tank 12 as indicated by the accumulation 18 of the flour.
[0019]
On the other hand, an air delivery device 20 is provided in the central hatch 14b. As shown in FIG. 2, the air delivery device 20 is a double tube, and an air supply device 26 (see FIG. 1) is connected to a curved tube 24 provided on the upper portion of the outer tube 22. A delivery nozzle that sends air for blocking moisture generated from the powder from coming into contact with the inner wall surface of the tank 12 along the inner wall surface of the tank 12, as indicated by a thin arrow, below the outer tube 22. 28 is arranged.
[0020]
The outer tube 22 is a space formed between the outer tube 30 and the inner tube 32, and the delivery nozzle 28 is disposed at the lower portion of the outer tube 22, and is shown in detail in FIGS. As shown, the wall 34 is provided at the lower end of the outer cylinder 30 and the plate 38 is fixed via a spacer 36. The air supplied from the air supply device 26 to the outer tube 22 formed between the outer tube 30 and the inner tube 32 via the bent tube 24 passes through the through holes 40 provided in the wall surface 34. It is supplied to the reservoir 42 and is sent out radially from the slit 44 defined by the thickness of the spacer 36.
[0021]
Here, the through-hole 40 connects the outer cylinder 30 and the air reservoir 42, and as shown in FIG. 3, a large number of circular through-holes 40 may be provided, or as shown in FIG. In addition, it may have a shape that is entirely cut out except for a portion for fixing the spacer 36 and the plate 38.
[0022]
The air sent in the horizontal direction from the slit 44 of the delivery nozzle 28 diffuses along the inner wall surface of the tank 12 and circulates in the tank 12 as shown by the thin arrows in FIG. Is discharged by the discharged air discharge device 48. Here, the inner tube 46 is a space inside the inner cylinder 32, and has a simple cylindrical shape in this embodiment.
[0023]
The air supply device 26 and the air discharge device 48 include pipe lines 50 and 52 connected to the air delivery device 20, filters 54 and 60 provided on the upstream side of the fans 54 and 56, and the fans 54 and 56, and downstream of the fan 54. And a filter 58 provided on the side. The fan 54 and 56, there is the flow rate and blowing air on the order of 10 m ³ / min in the interior of the tank 12 of the bulk vehicle 10 for powder transport, or discharged from the interior of the tank 12, using a ring blower It is desirable to do.
[0024]
The filter 62 provided on the upstream side of the fan 54 of the air supply device 26 protects the fan 54 by preventing inhalation of dust in the air. Further, the filter 58 provided on the downstream side of the fan 54 is configured such that dust that has passed through the filter 62 provided on the upstream side of the fan 54 or foreign matter such as oil droplets or abrasion powder generated from the ventilation fan 54 is stored in the tank. 12 is prevented from being mixed into the flour loaded on the No. 12.
[0025]
On the other hand, the filter 60 provided on the upstream side of the fan 56 of the air exhaust device 48 is for filtering the dusty flour sucked out from the inside of the tank 12 through the conduit 52, and if necessary. Thus, a strainer may be provided on the lower surface of the inner tube 46 to reduce the dusty flour sucked into the conduit 52.
[0026]
In the powder loading apparatus of the present embodiment, the air supply and discharge mechanism for blocking moisture generated from the powder so as not to contact the inner wall surface of the tank 12 is configured as described above. After the air sent in the horizontal direction from the slit 44 of the delivery nozzle 28 of the air delivery device 20 diffuses along the inner wall surface of the tank 12 and circulates in the tank 12 as shown by thin arrows in FIG. Since the air is discharged by the air discharge device 48 connected to the inner pipe 46, the tank 12 is fed from the feed nozzle 28 between the inner wall surface of the tank 12 and the flour to be fed or the air to be charged together with the flour. A layer of air diffusing along the inner wall surface of the tank is formed to prevent the inner wall surface of the tank 12 cooled with the outside air from directly contacting the humid air introduced together with the flour. Is condensation on the inner wall surface of the tank 12 can be prevented from occurring.
[0027]
In the winter season when most condensation occurs on the inner wall surface of the tank 12, as is well known, the outside air is often low temperature and dry, so the moisture generated from the powder is transferred to the tank 12. It is most suitable to adopt as air for blocking so as not to contact the inner wall surface. Therefore, the above description is based on the premise that the outside air is directly adopted as air for blocking moisture generated from the powder from coming into contact with the inner wall surface of the tank 12. However, in the case of rain or the like, since the air is moist, a dehumidifying device is arranged in the middle of the air supply device 26, for example, between the fan 54 and the filter 58 or between the filter 62 and the fan 54, Desirably, the outside air is forcibly dehumidified and used as air for blocking the moisture generated from the powder from coming into contact with the inner wall surface of the tank 12.
[0028]
FIG. 6 is a front view showing another example of a powder loading apparatus employing the dew condensation prevention device for a powder transport bulk vehicle according to the present invention. This embodiment also uses the same powder transport bulk car 10 as in the first embodiment, and the upper part of the body of the powder transport bulk car 10 is made of bulk powder containing moisture. A tank 12 for loading a certain flour is provided, and three or four hatches 14 for loading and loading the flour are provided on the upper surface of the tank 12. In this embodiment, flour is introduced from two hatches 14a on both sides by two bellows-shaped transfer tubes 16 as shown by thick arrows, and tank 12 as shown by flour accumulation 18 is shown. The air delivery device 66 is provided in the two hatches 14a on both sides while being deposited inside.
[0029]
As shown in FIG. 7, this air delivery device 66 is a double pipe, and the same air supply as that of the first embodiment shown in FIG. A device 26 (see FIG. 6) is connected, and air for blocking water generated from the powder from coming into contact with the inner wall surface of the tank 12 is indicated by a thin arrow at the lower portion of the outer tube 68. A delivery nozzle 72 is provided for delivery along the inner wall of the tank 12. On the other hand, as shown in FIG. 7, the inner pipe 74 connects the conveying tube 16 to the tapered portion at the upper end, and serves as an input path for flour when the flour is introduced into the tank 12.
[0030]
Air for blocking moisture generated from the powder from coming into contact with the inner wall surface of the tank 12 is sent radially from the delivery nozzle 72 and diffuses along the inner wall of the tank 12. After being circulated in the tank 12, the air is discharged by the air discharge device 48 through the air discharge pipe 78 provided in the central hatch 14b. The air discharge pipe 78 may be a hollow pipe that simply discharges the air in the tank 12 as in the case of the inner pipe 46 in the first embodiment shown in FIG. To do.
[0031]
In the embodiment described above, the outer tube 22 of the air delivery device 20 of the first embodiment shown in FIG. 1 is provided in the hatch 14a to which the conveying tube 16 is connected and the flour is charged, and only the inner tube 46 is hatched 14b. The structure of the bulk transportation vehicle 10 for powder transportation is exactly the same, the air supply device 26 and the air discharge device 48 can be used exactly the same, and the structure of the delivery nozzle 72 is also shown in FIG. 6 has the same structure as the delivery nozzle 28 shown in FIG. 5, the same reference numerals as those in the first embodiment shown in FIG.
[0032]
Since the dew condensation prevention device for the powder transport bulk vehicle of the present embodiment is configured as described above, it is fed from the feed nozzle 72 in the horizontal direction as in the first embodiment shown in FIG. As shown by thin arrows in FIG. 6, the air diffuses along the inner wall of the tank 12, circulates through the tank 12, and then is discharged by the air discharge device 48 connected to the air discharge pipe 78. The flour is introduced through the inner pipe 74 of the air delivery device 66.
[0033]
For this reason, the air sent out in the horizontal direction from the sending nozzle 72 circulates in the tank 12 without being hindered by the flour that is thrown in, and between the inner wall surface of the tank 12 and the air thrown in with the flour. Is formed with a layer of air that is delivered from the delivery nozzle 72 and diffuses along the inner wall surface of the tank 12, and the inner wall surface of the tank 12 that is cooled by the outside air, and the high-humidity air that is introduced together with the flour. Can be prevented from coming into direct contact, and condensation can be prevented from occurring on the inner wall surface of the tank 12.
[0034]
FIG. 8 is a front view showing a third example of a powder loading apparatus employing the dew condensation prevention apparatus for a powder transport bulk vehicle according to the present invention. Similarly to the first embodiment, this embodiment is also provided with a tank 12 for loading flour, which is a bulk powder containing moisture, on the upper part of the body of the bulk vehicle 10 for powder transportation. Three or four hatches 14 are provided on the upper surface of the tank 12 to load and load flour. In this embodiment, the flour 12 is fed from the two hatches 14 a on both sides by the two bellows-shaped transfer tubes 16 as indicated by thick arrows, and the tank 12 as shown in the accumulation 18 of flour as shown in FIG. The air delivery device 76 uses the existing vent pipe installed in the upper rear part of the tank as it is.
[0035]
In this embodiment, an existing vent pipe installed in the upper rear part of the tank 12 is used as it is as the air delivery device 76, and is sent from the horizontally arranged vent pipe which is the air delivery device 76 in the horizontal direction. The air diffuses along the inner wall surface of the tank 12, circulates as shown by the thin arrows in the figure, and is discharged by the air discharge device 48 via the air discharge pipe 78A provided in the central hatch 14b. . The function of the air exhaust pipe 78A is exactly the same as the function of the air exhaust pipe 78 in the second embodiment shown in FIG. 6, and thus further detailed description is omitted. The structure of the powder transport bulk vehicle 10 is exactly the same as that of the first and second embodiments described above, and the same air supply device 26 and air discharge device 48 can be used. Are denoted by the same reference numerals as those in the first embodiment shown in FIG.
[0036]
Since the dew condensation prevention device of the bulk vehicle for powder transportation according to this embodiment is configured as described above, it is sent in the horizontal direction from the air delivery device 76 as in the first embodiment shown in FIG. The air thus diffused along the inner wall of the tank 12 as shown by thin arrows in FIG. 8, circulates in the tank 12, and is then discharged by the air discharge device 48 connected to the air discharge pipe 78A. . For this reason, a layer of air that is sent from the air delivery device 76 and diffuses along the inner wall surface of the tank 12 is formed between the inner wall surface of the tank 12 and the air introduced together with the flour. Direct contact between the cooled inner wall of the tank 12 and the high-humidity air introduced together with the flour can be prevented, and condensation on the inner surface of the tank 12 can be prevented.
[0037]
As described above, the anti-condensation device for a bulk vehicle for powder transportation according to the present invention is a powder loaded when a bulk powder containing moisture such as flour is loaded on a tank of a bulk vehicle. It is characterized in that air for blocking the moisture generated from the body from coming into contact with the inner wall surface of the tank 12 is sent out along the inner wall surface of the tank, and various types can be used without departing from the gist of the present invention. It goes without saying that improvements and changes can be made.
[0038]
【The invention's effect】
As described in detail above, when a bulk powder containing moisture such as flour is loaded on a tank of a bulk car cooled by outside air in winter or the like, moisture generated from the powder is stored in the tank 12. Air that is blocked so as not to come into contact with the inner wall surface is sent along the inner wall surface of the tank, and the inner wall surface of the tank 12 cooled by the outside air and the high-humidity air introduced together with the flour are in direct contact with each other. By preventing the dew condensation on the inner wall surface of the tank 12 can be prevented.
[0039]
And by configuring in this way, when loading bulk powder containing moisture such as wheat flour on a bulk car in winter etc., it prevents condensation from occurring on the inner wall surface of the tank and generating water droplets The powder transportation bulk vehicle eliminates the need to remove the powder adhering to the inner wall surface of the tank and removing the powder adhering to the inner wall surface of the tank as a post-operation after transportation. It is possible to provide a dew condensation prevention device.
[Brief description of the drawings]
FIG. 1 is a front view, partly in section, illustrating an example of a powder loading apparatus employing a dew condensation prevention device for a powder transport bulk vehicle according to the present invention.
2 is a cross-sectional view showing details of an air delivery device in the powder loading device of FIG. 1;
FIG. 3 is an enlarged view of a part A in FIG. 2;
4 is an enlarged view of a part A in FIG. 2;
5 is a cross-sectional view taken along line BB in FIG.
FIG. 6 is a partial cross-sectional front view showing another example of a powder loading device employing the dew condensation prevention device for a powder transport bulk vehicle according to the present invention.
7 is a cross-sectional view showing details of an air delivery device in the powder loading device of FIG. 6. FIG.
FIG. 8 is a partial cross-sectional front view showing a third example of a powder loading device employing the dew condensation prevention device for a powder transport bulk vehicle according to the present invention.
FIG. 9 is a front view depicting a method of feeding flour and a method of discharging flour into a bulk vehicle for powder transportation according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Bulk vehicle 12 for powder transportation Tank 14 Hatch 16 Conveying tube 18 Flour accumulation 20 Air delivery device 22 Outer tube 24 Curved tube 26 Air supply device 28 Delivery nozzle 30 Outer cylinder 32 Inner cylinder 34 Wall surface 36 Spacer 38 Plate 40 Through-hole 42 Air reservoir 44 Slit 46 Inner tube 48 Air exhaust device 50, 52 Pipe line 54, 56 Fan 58, 60, 62 Filter 66 Air delivery device 68 Outer tube 70 Connection tube 72 Delivery nozzle 74 Inner tube 76 Air delivery device 78, 78A Air discharge pipe

Claims (6)

In bulk vehicle having a tank for stacking bulk powder containing water, the powder of the powder, in order to prevent condensation that occurs when stacked on the tank using the transfer tube from the source A dew condensation prevention device for bulk vehicles used when loading
An air supply device for supplying air around the tank to the inside of the tank;
An air delivery device for delivering the air supplied by the air supply device along the inner wall surface of the tank;
An air discharge device for discharging the air in the tank to the outside ,
The air delivery device is installed in a hatch provided on the upper surface of the tank, and a delivery nozzle that radially delivers the air supplied by the air supply device is disposed below the air delivery device. An anti-condensation device for a bulk vehicle for transporting powder, characterized in that The air delivery device is a double tube, the air supply device is connected to an outer tube, the delivery nozzle is arranged at the lower part of the outer tube, and the air discharge device is connected to an inner tube. The dew condensation prevention device for a bulk vehicle for powder transportation according to claim 1 . The air delivery device is a double tube, the air supply device is connected to an outer tube, the delivery nozzle is disposed at a lower portion of the outer tube, and the carrier tube supplies the powder to the inner tube The dew condensation prevention device for a bulk vehicle for powder transportation according to claim 1 , wherein The dew condensation prevention device for a powder transport bulk vehicle according to any one of claims 1 to 3 , wherein the air supply device is provided with a filter on an upstream side and a downstream side of a fan. The said fan is a ring blower, The dew condensation prevention apparatus of the bulk vehicle for powder transport of Claim 4 characterized by the above-mentioned. The dew condensation prevention device for a bulk vehicle for powder transportation according to any one of claims 1 to 5 , wherein the air supplied by the air supply device is outside air.

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