JP2001009826A - Covering member for cooling of tank-shaped container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a temperature rise due to the veporization and scattering of the moisture content of a material stored in a tank-shaped container by providing a covering belt which can envelope the outer peripheral face of the tank-shaped container such as a mixer drum of a concrete mixer truck or the like, and in such a manner that the covering belt having water absorptive property makes the moisture content vaporize and disperse from the outer surface. SOLUTION: When a covering fitment 3 for cooling is attached to a mixer drum 2 of a concrete mixer truck 1, the covering fitment 3 comes into close contact with the outer peripheral face of the mixer drum 2 to be wound around the latter. The covering fitment 3 also has a covering belt 3A made of a flexible material and a fitting means 3B for fixing the covering belt 3 to the mixer drum 2. The covering belt 3A is formed to fit the peculiar shape of the mixer drum 2 in such a way that the cylindrical winding part corresponding to a cylindrical part 2A in the intermediate part of the mixer drum 2 is of a slender rectangular and beltlike shape and the tapered winding part corresponding to the forward and the back tapered part 2B, 2C of the mixer drum 2 is formed by stitching seams of a plurality of cut sector pieces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system for a tank-shaped container for preventing the temperature of a container stored in a tank-shaped container from rising due to heat of vaporization caused by evaporation of water or reducing the temperature in a hot outdoor environment. The present invention relates to a covering device.

[0002]

2. Description of the Related Art For example, a concrete mixer truck has been generally used as a means for transporting ready-mixed concrete obtained by adding water to cement, aggregate, sand or the like to a concrete casting site. In this concrete mixer truck, a mixer drum is rotatably mounted in a forward leaning posture on a carrier part of a self-propelled vehicle, and the ready-mixed concrete drum is filled in the mixer drum and transported to a construction site, During the running, the mixer drum is rotated to maintain and promote the kneading state. In order to ensure the reaction characteristics of the ready-mixed concrete and the strength after solidification, particularly the compressive strength, the time required for transferring the ready-mixed concrete to the construction site after kneading is set to 90 minutes at the maximum.

[0005] As shown in FIG. 9, the relationship between the strength of concrete and the decrease in strength is seen from about May, and reaches a peak in August.

[0004] From late July to early August, the increase in the ratio of factory with reduced strength is lower than the rise in temperature, because most factories have modified their blends in summer. .

In view of this situation, it has been found that the decrease in summer strength of concrete is caused by an increase in the temperature of the concrete and the rise in the temperature at which the concrete is kneaded.

Since the reaction of the ready-mixed concrete proceeds in proportion to the rise in the temperature of the ready-mixed concrete, various measures have been taken to suppress the progress of the reaction of the ready-mixed concrete. As the means, means for mixing a reaction retarder to prevent the reaction of ready-mixed concrete from proceeding, means for mixing low-temperature water to prevent temperature rise,
Means for providing a sunshade or a heat insulating material above the mixer drum are generally employed. Regarding the use of this insulation,
For example, as disclosed in Japanese Patent Application Laid-Open No. Sho 59-38014, there is an example in which it is also used as a means for preventing a decrease in temperature of concrete.

[0007]

However, in the means for mixing the above-mentioned reaction retarder, the reaction delay agent itself is expensive, which leads to an increase in cost, and reduces the heat with respect to heat given from the outside. There are disadvantages such as no function. In the above-mentioned means for adding a large amount of low-temperature water, mixing with groundwater or the like is conceivable as a means for obtaining low-temperature water. However, there are some aspects that cannot be expected due to restrictions on water intake due to land subsidence. Also in this case, it is not possible to prevent a rise in the temperature of the ready-mixed concrete due to heat from the outside over time. Further, the above-described sunshade has a drawback that even if it can block direct sunlight, it cannot solve temperature rise due to external heat at all, as in the case described above. Further, in the case where the heat insulating material is provided, it is impossible to maintain or lower the initial temperature of the ready-mixed concrete, although the heat transfer can be slightly prevented.

[0008] At the work site, the concrete cannot be poured due to high temperature or direct sunlight, the pouring after 4:00 pm is specified, or the scheduled time of transportation is exceeded due to traffic congestion or the like. In some cases, pouring was refused because the temperature of the ready-mixed concrete exceeded 35 ° C.

On the other hand, in a tank truck, etc.,
When the temperature of gasoline, etc., stored in the tank rises due to heat from the outside, vaporization proceeds in the tank and evaporation loss occurs. There is a problem that it is necessary to stand up and perform degassing, so that the work is troublesome.

[0010] Further, in the silo in the form of a tank, there is a problem that the fermentation proceeds rapidly due to heat from the outside, the grass is putrefied, and it is not suitable for feed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has been made to solve the above problems, and is intended to prevent the contents in a tank-like container from being affected by high temperatures.

That is, in the case of a concrete mixer truck, the temperature rise of the ready-mixed concrete in the mixer drum is suppressed or the temperature is lowered until the ready-mixed concrete is transported to the work site by the concrete mixer truck, thereby deteriorating the characteristics of the ready-mixed concrete. In the case of tank trucks, regardless of whether the vehicle is a car or a freight car, heat from the outside suppresses the temperature rise of the stored material, preventing gasification even if the stored material is gasoline, reducing evaporation loss. It is an object of the present invention to provide a cooling device for a tank-like container which can prevent silage in the case of silos.

[0013]

As a means for solving the above-mentioned problems, the present invention relates to a covering band made of a flexible material which is formed so as to be wound around the outer periphery of a tank-like container and which can cover the outer peripheral surface of the container. The coated band has a water absorbing property and the outer surface is capable of evaporating moisture. When the target container is a mixer drum, the coating band has a cylindrical winding portion having a length corresponding to a middle cylindrical portion in the front-rear direction thereof, and is provided in front of and behind the cylindrical winding portion so as to be continuous with the cylindrical winding portion. And a tapered winding portion wound in a pre-squeezed shape corresponding to the tapered portion.

[0014] Thus, the inside of the tank is cooled by the heat of vaporization when the water impregnated by the water absorption is evaporated by the heat received from the outside, whereby the active cooling can be achieved in addition to the heat insulation effect.

In the above case, the inner surface of the covering zone in contact with the outer peripheral surface of the tank-shaped container is formed of a water-impermeable or poorly water-permeable sheet, and the outer surface is formed of a water-permeable sheet. It is preferable to sandwich the material. As the water-impermeable sheet or the water-impermeable sheet, a tightly packed fabric, a synthetic resin sheet, or another flexible sheet material can be used, and as the water-permeable sheet, a coarse-grained cloth, a nonwoven fabric, A flexible sheet material such as a mesh material or a perforated resin sheet can be used.

It is preferable to use an absorbent mainly composed of a water-absorbing polymer fiber as the above-mentioned water-absorbing material, since the cooling time can be extended. It is also preferable to include the shape-retaining fiber in the absorbent body, since it is useful for the polymer fiber to be present as an independent single fiber, and in addition to securing a surface area and improving water evaporation.

As fastening means for fixing the covering band to the tank-like container, fastening members such as a binding string and a connecting band are attached in advance at a plurality of locations at the butting ends of the covering band. Means for fixing the covering band with a garment, or means for fastening the covering band separately from or integral with the covering band around a plurality of locations on the outer periphery of the covering band wound around the tank-like container, and the like can be used.

At least at the front end side of the covering band, a fastening means for folding along the front end surface of the tank-like container from the outer peripheral portion of the front end of the tank-like container to fasten the front end of the covering band is provided so that the covering band can be covered during traveling. Stripping of the band can be prevented. As the fastening means, a rope is passed through the front edge of the covering band as a bag binding, a means for clamping by tightening the rope, a fixing means by a flat fastener, and other appropriate means are employed. Can be.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 shows an embodiment in which a cooling coating device 3 (hereinafter simply referred to as a coating device) according to the present invention is applied to a mixer drum 2 of a concrete mixer truck 1. FIG. 3 shows an example of an appearance in a state in which the cover 3 is wound, FIG. 2 shows a perspective view of only the covering device 3, and FIG. 3 shows a side view.

The concrete mixer truck 1 is generally used, and a mixer drum 2 is supported at a rear portion of a vehicle body 1a in a forwardly inclined posture so as to be rotatable around its axis.
At the rear end of the vehicle body 1a, a hopper 4 for pouring ready-mixed concrete into the mixer drum 2 and a chute 5 for discharging are provided.

The above-mentioned mixer drum 2 has a unique shape in which an intermediate portion in the axial direction has a cylindrical shape, and a front portion and a rear portion thereof have a peculiar shape in which a tapered shape of a squeezed shape is provided. There is a passive portion 6 made up of friction wheels (or gears), and power is transmitted through a rotation transmission system, so that the mixer drum 2 is given a gentle rotation during traveling, and the ready-mixed concrete inside is continuously kneaded.

The covering device 3 is tightly wound around the outer peripheral surface of the mixer drum 2 and has a covering band 3A made of a flexible material. The covering band 3A is fixed to the mixer drum 2. Fastening means 3B for performing the fixing.

As shown in a developed view in FIG. 5, a cylindrical winding corresponding to the cylindrical portion 2A at the intermediate portion of the mixer drum 2 is formed so that the coating band 3A conforms to the above-mentioned specific form of the mixer drum 2. The portion 7 is formed in an elongated rectangular band shape, and the tapered winding portions 8, 9 corresponding to the front and rear taper portions 2B, 2C of the mixer drum 2 are divided into sector-shaped pieces 8a, 8a,. 9a ... seam 10, 1
1 are connected by sewing, so that the tapered portions 2B and 2B of the mixer drum 2 can be wound when wound around the mixer drum 2.
It is formed so as to be wound in conformity with the taper of C. These tapered winding portions 8 and 9 are sewn to the cylindrical winding portion 7 to form the configuration shown in FIG.

In the illustrated embodiment, the fastening means 3B for winding the coating band 3 around the mixer drum 2 and fixing it to the butting ends 3C, 3C of the coating band 3A.
Is provided.

In the embodiment shown in FIGS. 1 to 3, the binding strings 12,
12 are attached correspondingly, and these binding strings 1
By tying 2 and 12, covering band 3A as shown in FIG.
Is fixed in a state of being closely attached to the outer peripheral surface of the mixer drum 2.

As the fastening means 3B, as shown in FIG. 4A, one end of a band 12 is fixed to one inner surface of each of the butting ends 3C, 3C, and a buckle 12a is attached to a region. A structure for fastening by coupling with the buckle 12a, or a structure for attaching the binding strings 14, 14 to the butting ends 3C, 3C as shown in FIG. 4 (B), and further, as shown in FIG. 4 (C). 3
A configuration in which C and 3C are formed to be slightly longer so as to partially overlap each other, and the hook side and the loop side of the planar fastener 13 are respectively fixed to the mating surfaces thereof, and the butt ends 3C and 3C are fixed by overlapping. Alternatively, an appropriate means such as a configuration in which binding straps 14 and 14 are provided in addition to the planar fastener 13 can be adopted.

The fastening means 3B is not necessarily required to be integral with the covering band 3A. For example, as shown in FIG. The fastening band 15 may be wrapped around a plurality of surroundings for fastening.
Instead of 5, a fastening rope may be used.

The constituent material of the covering band 3A is formed of a flexible sheet material that can be wound closely on the outer peripheral surface of the mixer drum 2.

In the case where the cover 3A has a heat insulating property, the cover 3A is made of a heat reflecting sheet, a foam sheet, a sheet material having a gap made of rock wool fiber or glass wool fiber, or the like.

Since the inside of the mixer drum 2 is actively cooled by utilizing the heat of vaporization due to the evaporation of water in addition to the above-mentioned heat insulating function, as shown in FIG.
The constituent material of A is made of a material having water absorption, for example, a thick cloth, an open-cell foamed resin sheet, or a nonwoven fabric, and the outer surface 3a is capable of evaporating moisture, and the inner surface 3b
(The side in contact with the mixer drum 2) is an impermeable or impervious sheet. After the covering tool 3 is wound around the mixer drum 2, water is sprayed on the covering band 3A prior to the start of operation of the concrete mixer truck 1. When the temperature of the coating zone 3A rises due to sunshine while traveling, the mixer drum 2 is cooled by the heat of vaporization when the water evaporates, so that the water in the mixer drum 2 is cooled. The rise in temperature of concrete is suppressed.

In the case of imparting the above-mentioned water absorbency, as shown in FIG. 6B, the inner side 3b is coated with an impermeable sheet 16, for example, a resin sheet such as vinyl or polyethylene, or a cloth of nylon or the like by applying the above-mentioned resin film. Pasted (or coated) sheet, highly airtight fabric, rubber sheet, waterproof paper,
The outer surface 3a is formed of a water-permeable sheet 17, for example, a sheet made of a mesh material, a cloth such as a cotton cloth, a porous resin sheet, or the like.
A sandwich structure in which a water-absorbing material 18, for example, a water-absorbing material using a particulate polymer absorbent, a polymer absorbing fiber, a water-retentive irregular-shaped fiber, or the like, is interposed between the materials 17.

When a polymer absorbing fiber is used as the water-absorbing material, it is desirable to add a shape-retaining fiber thereto.
Normally, when a cotton-like or non-woven fabric is manufactured using only a polymer fiber absorber, the fibers tend to stick together via water to form a lump, and the lump-like lump reduces the surface area and reduces the water evaporation function. However, when the absorbent is mixed with shape-retaining fibers such as polyethylene, polyester, polypropylene and nylon to form a cloth (non-woven fabric), different kinds of fibers are interposed between the fibers. The above-mentioned clumping is prevented, and the fibers constituting the absorber are present as single fibers, so that a large surface area is ensured and water can be smoothly evaporated.

FIG. 7 shows the front end of the coating band 3A so that when the concrete mixer truck 1 travels with the covering device 3 wound around the mixer drum 2, the covering device 3 does not peel off due to the wind pressure received during traveling. Is provided with fastening means 19.

That is, the front end 3D of the covering band 3A is formed so as to be folded along the front end surface 2D of the mixer drum 2, a loop 20 for threading is formed on the front end 3D, and the string 21 is passed through this. By pulling and tying both ends of the string 20, the front end 3D is fastened so as to cover the periphery of the front end face 2D of the mixer drum 2 as shown in FIG. This prevents the front end 3D of the cover band 3A from being turned up even when the traveling wind of the concrete mixer truck 1 is received.

The covering device 3 of the tank-shaped container according to the present invention is made of a water-permeable cloth coated with silvery white on the outer surface side of the covering band 3A, and is made of water-impermeable or poorly water-permeable cloth on the inner surface side. A concrete mixer truck (2t car) without a covering and a concrete mixer truck (2t car) with a molecular fiber absorber narrowly arranged and having a thickness of about 3 mm applied to the mixer drum 2 of the concrete mixer truck 1 (2t truck) under the same conditions Table 1 and FIG. 8 show the results of a comparative experiment in which the robots were run in parallel.

[0037]

[Table 1] In Table 1, “Test No.” indicates the number of runs.
"Transportation time" is the actual time of actual travel, and "Outside air temperature" is the temperature at the time of traveling. , "Initial temperature"
Indicates the temperature of the ready-mixed concrete in the mixer drum before the start of traveling. The “rising temperature” indicates a difference between the temperature of the ready-mixed concrete after the lapse of the transfer time and the initial temperature. FIG. 8 is a graph showing the experimental results shown in Table 1.

From these results, it was found that in the case of "without covering device", the temperature reached the maximum allowable temperature of 35 ° C. of the ready-mixed concrete twice, and that the ready-mixed concrete was cast. And it has to be disposed of. In some cases, it is sufficiently estimated that even if the actual running time does not reach 35 ° C., it will reach 35 ° C. if the running time is prolonged. It has been found.

On the other hand, in the case where the covering device 3 is covered, the temperature of all the components is significantly lower than 35 ° C., and the temperature rise is 2 ° C. at the maximum. This indicates that the water contained in 3A was cooled by the heat of vaporization accompanying the evaporation of the water contained therein, and it was found that the temperature remained sufficiently within the allowable temperature even if the transport time was extended.

The above description has been given of the case where the covering tool for a tank-shaped container according to the present invention is applied to the mixer drum 2 of the concrete mixer truck 1. However, when the object is a tank of a tank truck, a tapered covering band 3A is formed on the covering band 3A. It is only necessary to provide a straight shape without providing the winding portions 8 and 9. By winding this, the temperature of gasoline and the like in the tank is prevented from rising, and gasoline and the like are prevented from being vaporized and gasified. It is possible to prevent the inside from becoming high pressure, and it becomes unnecessary to perform degassing at the time of discharge.

When applied to a silo, the inside can be prevented from being heated to a high temperature, so that decay of grass can be prevented, and a good feed can be obtained.

[0042]

As described above, when the present invention is applied to a concrete mixer truck, even if the mixed concrete is filled in a mixer drum of the concrete mixer truck and conveyed to a construction site, it can be exposed to direct sunlight. The heating of the mixer drum can be prevented by the heat of vaporization due to the evaporation of the water, and the heating of the ready-mixed concrete in the mixer drum can be prevented, and the deterioration of the properties of the concrete can be prevented.

Further, if the structure is such that a water-absorbing material is provided in the covering band of the covering device and water is evaporated from the outer surface side,
After being wrapped around a mixer drum of a concrete mixer truck, tank lorry tank, or silo, and immediately before starting operation, spray water to impregnate the coated band and receive heat. Evaporates, the inside of the tank-shaped container is cooled by the heat of vaporization at the time of the evaporation, and the temperature rise of the stored items is positively suppressed, and in the case of a concrete mixer truck, the property deterioration is prevented even if the transportation time is long, In the case of a tank lorry, gasoline can be prevented from evaporating, and in the case of a silo, decay of grass can be prevented.

Further, if a fastening means is provided at the front end of the covering band, the covering band will not be turned up even if it receives wind pressure during traveling of a concrete mixer truck or the like, so that the covering band is prevented from being damaged and the vehicle can travel safely. Can be.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a mixer drum of a concrete mixer truck is covered with a covering device according to the present invention.

FIG. 2 is a perspective view showing an embodiment in which the covering device according to the present invention is used for a mixer drum of a concrete mixer truck.

FIG. 3 is a side view showing a state in which butting ends are stapled.

FIGS. 4 (A) to (D) are exemplary views of fastening means for fixing a butt end of a covering band.

FIG. 5 is a developed plan view of a covering band in the covering device of FIG. 2;

FIGS. 6A to 6C are partial cross-sectional views illustrating constituent materials of a covering band.

FIG. 7 is a partial cross-sectional view showing an example of a case where a fastening means is provided at a front end of a covering band.

FIG. 8 is a graph showing experimental results of the covering device according to the present invention.

FIG. 9 is a graph showing a relationship between an air temperature and a concrete strength reduction factory ratio.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete mixer truck 2 Mixer drum 3 Covering device according to the present invention 3A Covering band 3B Fastening means 3C Butt end 3D Front end 4 Hopper 5 Chute 6 Passive part 7 Cylindrical winding part 8, 9 Tapered winding part 10, 11 Seam 12 binding string 13 planar fastener 14 fastening band 15 fastening band 16 impermeable sheet 17 water-permeable sheet 18 water-absorbing material 19 fastening means 20 loop 21 string

Claims (11)

[Claims] 1. A covering band made of a flexible material which is formed so as to be wound around the outer periphery of a tank-shaped container and which can cover the outer peripheral surface of the container. A cooling device for a tank-shaped container, characterized in that the surface is capable of evaporating moisture. 2. The cooling device for a tank-shaped container according to claim 1, wherein said coating band has fastening means for fixing said band to said tank-shaped container. 3. The coating belt has an inner surface in contact with the outer peripheral surface of the tank-shaped container made of a water-impermeable or poorly water-permeable sheet, and an outer surface made of a water-permeable sheet. The coating device for cooling a tank-shaped container according to claim 1 or 2, wherein the material is interposed. 4. The cooling cover for a tank-shaped container according to claim 3, wherein the sheet on the inner surface side is made of a water-impermeable or poorly water-permeable cloth, and the outer surface side is made of a water-permeable cloth. 5. The cooling device for a tank-shaped container according to claim 3, wherein the water-absorbing material is mainly composed of a water-absorbing polymer fiber absorbent. 6. The covering device for cooling a tank-like container according to claim 5, wherein said water-absorbent polymer fiber absorbent contains shape-retaining fibers. 7. A fastening means for folding at least a front end side of the covering band from an outer peripheral portion of a leading end of the tank-shaped container along a leading end surface of the container to fasten a leading end of the covering band. The coating device for cooling a tank-shaped container according to any one of claims 1 to 6. 8. The coating device for cooling a tank-shaped container according to claim 1, wherein said drum-shaped container is a mixer drum of a concrete mixer truck. 9. A cylindrical winding part having a length corresponding to a middle cylindrical part of the mixer drum in the front-rear direction,
9. The tank-shaped container according to claim 8, further comprising a tapered winding portion connected before and after the cylindrical winding portion and wound in a squeezed shape corresponding to the tapered portions before and after the mixer drum. Cooling device. 10. The cooling device for a tank-shaped container according to claim 1, wherein the drum-shaped container is a tank of a tank truck. 11. The covering device for cooling a tank-shaped container according to claim 1, wherein said drum-shaped container is a tank-shaped silo for pasture fermentation.