JP2009166355A - Cooling device of mixer drum - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To retain a water effectively in a cover sheet which is wound around the outer periphery of a mixer drum mounted on a concrete mixer and cools the mixer drum by a vaporization heat of the water after sprinkling the water. <P>SOLUTION: The cover sheet 3 includes a sandwich structure composed of a hardly water-permeable sheet, a water retention sheet and a water-permeable sheet in order from the mixer drum 2 side, and seams penetrating each sheet are provided in a grid form. Further, a plurality of hardly extendable belts sewed to the hardly water-permeable sheet in the peripheral direction of the mixer drum 2, and bands are provided for detachably fixing ends of each belt mutually. The cover sheet 3 is fixed to the mixer drum 2 by fastening with the belts and the bands. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tank-shaped container cooling apparatus, and more particularly to a cooling apparatus suitable for cooling a mixer drum mounted on a concrete mixer truck.

  In a concrete mixer truck, a mixer drum is rotatably mounted in a forward tilting posture of about 15 degrees on a loading platform portion of a vehicle capable of running on itself, and the mixer drum is rotated while traveling to maintain a ready-mixed state of ready-mixed concrete.

  It is known that ready-mixed concrete reacts with an increase in temperature and causes a decrease in strength. For example, Patent Documents 1 and 2 disclose a cover sheet that is formed so as to be wound around the outer periphery of the mixer drum and covers the outer peripheral surface of the mixer drum. By including it, the mixer drum is cooled by the heat of vaporization when water evaporates when the temperature of the cover sheet rises due to sunshine during traveling, etc., and the temperature rise of the ready-mixed concrete in the mixer drum is suppressed.

Non-Patent Document 1 introduces a product called “drum cooling cover”. This product has a three-layer structure in which a non-combustible cloth with a two-layer structure and a surface material are bonded together by quilting, so that water is contained in the internal superabsorbent fibers and cooled by the heat of vaporization when the moisture evaporates By doing so, the drum is actively cooled simultaneously with blocking direct sunlight.
Japanese Utility Model Publication No. 60-159608 Japanese Patent Laid-Open No. 2001-9826 [Search January 16, 2008], <URL: http://www.kgw.co.jp/dv/sp/thermo/thermo01.html>

  The cover sheet of Patent Document 1 is a water-absorbing sheet single layer, and in Patent Document 2 and Non-Patent Document 1, it has a three-layer structure. In either case, a cover sheet is wound around the mixer drum.

  The fastening structure of Patent Document 1 is fastened by attaching a hook-and-loop fastener to one sheet surface and the other sheet back surface. On the other hand, according to Non-Patent Document 1, a buckle is provided at the mating end and fastened. Patent Document 2 further discloses one using the above buckle, one using a binding string, one using a hook-and-loop fastener, or one that tightens the outer periphery of the cover sheet with a fastening band.

  The surface area of the mixer drum is vast, and if it is sprinkled with water, its weight becomes excessive. When using the above buckle or binding string, it is necessary to increase the number of places to be fastened and distribute the tightening force to withstand the weight of water, which is very laborious to install. It was. For this reason, it was not uncommon to leave the cover sheet worn throughout the year. Moreover, when the surface sheets of the cover sheet are fastened together, it works as a force for squeezing out the water that has been impregnated, and the water flows out to the mixer car body and is exposed to rust corrosion. On the other hand, when the outer periphery of the cover sheet is tightened with a fastening band, the number of bands is reduced compared to the buckle due to the difficulty of attachment, and as a result, the tightening strength is increased and the surface sheet is locally covered with a wide band. Therefore, the cooling effect is not obtained by the width of the band, and attachment is difficult.

  The present invention has been made with a focus on the above-mentioned conventional problems and has been made to solve the problems, and prevents the outflow of water from the cover sheet covering the mixer drum.

  As a means for solving the above-mentioned problems, the present invention provides a tank-like container that is wound around the outer periphery of a tank-like container and sprayed with water on a sheet that is detachably fastened to the ends thereof. In the cooling device for cooling, the tank-shaped container has a sandwich structure composed of a hardly water-permeable sheet, a water-retaining sheet, and a water-permeable sheet from the surface side of the tank-like container, and has seams penetrating each sheet in a lattice shape. A plurality of non-stretchable belts sewn on the hardly water-permeable sheet toward the circumferential direction, and a locking structure for detachably fastening the end portions of each belt.

  According to the present invention, a large amount of water can be retained without any unevenness of water, and the outflow of water from the cover sheet can be suppressed.

  Hereinafter, embodiments will be described with reference to the drawings. This embodiment shows an example in which the cover sheet 3 by the cooling device of this embodiment is applied to a mixer drum 2 of a concrete mixer truck 1 as a tank-like container. In FIG. 1, the cover sheet 3 according to this embodiment is wound around the mixer drum 2 and then sprayed with water to sufficiently contain water. During traveling, the mixer drum 2 is cooled by the heat of vaporization when the water absorbed in the cover sheet 3 evaporates, and the temperature rise of the ready-mixed concrete in the mixer drum 2 is suppressed.

  In the concrete mixer truck 1, a mixer drum 2 is supported at a rear portion thereof so as to be rotatable around an axis inclined with respect to a horizontal plane in a forward inclined posture. A hopper 21 for pouring ready concrete into the mixer drum 2 and a chute 22 for discharging are attached to the rear end.

  The mixer drum 2 has a cylindrical shape in the middle in the axial direction of the rotating shaft 4 having an angle slightly inclined from the horizontal, and has a shape in which the front and rear portions are pre-squeezed tapered, and the rear portion 2C. Near the rear end, there is a passive part 5 made of a friction wheel (or gear), power is transmitted through a rotation transmission system, and gentle rotation is given to the mixer drum 2 while traveling, and the internal ready-mixed concrete is continuously kneaded.

  FIG. 2 shows a development view of the cover sheet 3. The cover sheet 3 has an elongated rectangular band portion 6 corresponding to the cylindrical portion 2 </ b> A in the middle portion of the mixer drum 2. The fan portions 7 and 8 corresponding to the front and rear taper portions 2B and 2C of the mixer drum 2 are configured by connecting the pieces 61 to 67 and 81 to 87 cut into a sector shape in a fan shape. ing. The fan portions 7 and 8 are connected to the left and right long sides b and c of the belt portion 6 by sewing the outer peripheral side end portions thereof. As a result, as shown in FIG. 4, a shape suitable for covering the shape of the mixer drum 2 is formed.

  The cover sheet 3 is further quilted with a grid-like mesh so as to penetrate the three-layer structure sheets 31, 32, and 33. In the figure, the grating applied to the belt part 6 and the fan parts 7 and 8. The meshes 9, 10 indicate the direction of quilting seams. That is, in the band portion 6, this lattice-like mesh has a line connecting the upper and lower diagonal vertices P and P ′ intersecting the upper and lower sides a and d of the band portion 6, and apexes Q in the left and right diagonals, The line connecting Q ′ is arranged so as to intersect the left and right sides b and c of the cylindrical winding part 7.

  On the other hand, the pieces 61 to 67 and 81 to 87 are also quilted so as to form a lattice-like mesh, and this mesh has a line connecting the vertices P and P ′ at the upper and lower diagonals. Are arranged so that the lines connecting the vertices Q and Q 'on the left and right diagonals intersect the left and right sides f and i of the sector.

  As shown in FIG. 3, the belt part 6 and the pieces 61 to 67 and 81 to 87 have a three-layer structure, and the inner surface side sheet 31 is made of a non-permeable sheet, for example, a resin sheet such as vinyl or polyethylene, nylon or the like. The sheet is made of a sheet of vinyl or polyethylene resin film (or coated), or a sheet of high airtight cloth, rubber sheet, waterproof paper, metal or the like. The outer surface side sheet 33 is composed of a water permeable sheet, for example, a sheet made of a mesh material, a cloth such as a cotton cloth, a porous resin sheet, and the like. A water retention sheet 32 is disposed between the inner and outer surface side sheets 31 and 33, and a water absorbent cloth or the like using a granular polymer absorber, a polymer absorption fiber, a modified cross-section fiber having water retention, or the like is interposed therebetween. Sandwich structure.

  FIG. 5 is a cross-sectional view in which the mixer drum 2 is omitted in a state of being wound around the mixer drum 2, and is a view of the fastening portion of the cover sheet 3 as viewed from the inside of the cover sheet 3. A plurality of belts 11 made of a non-stretchable cloth material are drawn on the entire inner surface of the cover sheet 3 that is in contact with the mixer drum 2 so as to draw a circumference. The belt 11 is provided at three locations corresponding to the cylindrical portion 2 </ b> A at the intermediate portion of the xerer drum 2, and about 1 to 2 locations corresponding to the front and rear tapered portions 2 </ b> B and 2 </ b> C of the mixer drum 2.

  The belt 11 is a portion to which a tightening force is applied when the cover sheet 3 is attached to the mixer drum 2, and the surface on the side in direct contact with the mixer drum 2 is processed to prevent slipping. The belt 11 is sewn so as to be integrated with the inner surface side sheet 31 up to a slightly inner side (part indicated by a broken line S in the drawing) of the fastening portions on both sides that become the joints of the cover sheet 3.

  As a locking structure between the belts, one end of the band 11 is firmly sewn to one end 13 of the belt 11. A male hook 15 is attached to the other end of the belt 11. The band 12 is an elastic material made of rubber, and a hole through which a male hook is inserted is provided at the tip of the band 12, and a grommet 14 that reinforces the periphery of the hole is set. The cover sheet 3 is locked by the eyelet 14 of the band 11 and the hook 15 to be detachable. The belt 11 is only sewn to the inner surface side sheet 31 up to a slightly inner position (broken line s), and only one end of the band 11 is fixed to one end 13 of the belt 11. Since there is no portion stitched with the cover sheet 3, when the cover sheet 3 is fixed to the mixer drum 2, the butted ends (a, d) of the cover sheet 3 overlap each other.

  The cover sheet 3 fastened in this way is used for tightening the mixer drum 2 by the belt 11 and the band 12. The belt 11 is connected to the inner sheet 31 of the cover sheet 3 and is fastened by quilting with the water retaining sheet 32 and the outer sheet 33. On the other hand, a large number of lattice-shaped small rooms k (see FIG. 2) having quilting seams 9 and 10 as walls exist, and water is stored in each small room. Here, the outer surface side sheet 33 is not applied with a tightening force when being attached to the mixer drum 2 and is only fixed to the inner surface side sheet 31 by sewing by quilting processing. As a result, it is possible to make a state in which a large number of water droplets are stably attached to the inner surface side sheet 31.

  As a result, even when water is contained in the cover sheet 3, the water is retained by being dispersed in the small rooms having the seams 9 and 10 as walls, so that the water can be smoothly contained without being unevenly distributed. Moreover, since there is no water bias even in rainy weather or cold weather, the burden on the rotating shaft of the mixer drum 2 is small.

  Returning to FIG. 1, as shown in the drawing, a zigzag path 20 is formed on the surface of the cover sheet 3 that has been quilted into a lattice shape by a stitch. This is because the line connecting the upper and lower diagonals of the lattice-like mesh intersects the upper and lower sides of the cylindrical winding part 7 and the line connecting the upper and lower diagonals is the cylindrical winding part 7. It is because it arrange | positioned so that it may cross | intersect the right-and-left side of. As a result, the water overflowing on the surface of the cover sheet 3 does not fall linearly on the surface of the cover sheet 3, but is taken in by the seam and falls down through the seam of the jigsag. Furthermore, since the path length on the surface of the cover sheet 3 becomes longer due to the zigzag, the upper part is pulled upward again before dropping from the mixer drum 2 due to the rotation of the mixer drum 2. As a result, it is possible to suppress water from falling below the mixer drum 2 and to reduce the influence of rust corrosion.

  When the cover sheet 3 is attached to the mixer drum 2 with respect to the outer sheet of the cover sheet 3, the butted ends overlap each other. A hook-and-loop fastener may be attached to the overlapping portion, and the overlapping portion may be stopped and the shape may be adjusted so that the appearance becomes a cylindrical shape.

  In the above embodiment, the band 12 is a rubber member. However, the belt 11 may be made longer to correspond to the band 12. In this case, if the length of the belt 11 is equal to the circumferential length of the mixer drum 2, the attachment to the hook 15 becomes somewhat difficult, so it may be slightly longer.

  In the above embodiment, the belt 11 is provided between the inner surface side sheet 31 and the mixer drum 2, but may be provided between the inner surface side sheet 31 and the water retaining sheet 32. In this case, the belt 11 is sewn to the inner surface side sheet 31 and is fixed to the band 12 via the inner surface side sheet 31.

  The hook 12 is used for the detachable attachment of the band 12. However, a buckle may be used or a binding string may be used. The type of the locking piece is not limited, but a locking piece in which the belts 12 are firmly connected is used.

  In the above embodiment, the mixer drum of a concrete mixer truck is shown as an example, but the present invention can be applied to a vehicle such as a tank truck having a tank-like container, and further to a silo, an asphalt drum, and the like. In this case, the tank-shaped container that does not rotate cannot be expected to obtain the effect of suppressing the falling of water from the outer surface of the cover sheet by the zigzag path formed by the lattice stitches. However, there is a water retention effect due to the fact that the tightening force on the tank-shaped container is hardly applied to the surface-side sheet having a three-layer structure.

The side view which shows the state which coat | covered the cover sheet 3 by a present Example on the mixer drum 2 of the concrete mixer truck 1. FIG. FIG. FIG. 6 is a cross-sectional view illustrating the constituent materials of the cover sheet 3. Completion drawing of cover sheet 3. Sectional view in which the mixer drum 2 is omitted while being wound around the mixer drum 2

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete mixer truck 2 Mixer drum 3 Cover sheet 6 Band part 7, 8 Fan part 11 Belt 12 Band

Claims (3)

In a cooling device that wraps around the outer periphery of the tank-shaped container and sprays water onto a sheet that is detachably fastened between the ends, and cools the tank-shaped container by the heat of vaporization of water,
It is a sandwich structure consisting of a hardly water permeable sheet, a water retaining sheet, and a water permeable sheet from the surface side of the tank-shaped container, and has a grid-like seam that penetrates each sheet, and further toward the circumferential direction of the tank-shaped container A cooling device for a tank-like container, comprising: a plurality of non-stretchable belts sewn on the hardly water-permeable sheet; and a locking structure that detachably fastens end portions of each belt.   The tank-shaped container is a mixer drum of a concrete mixer truck, and the lattice-shaped seams are provided so as to form a zigzag path from above when wound around the outer periphery of the mixer drum. The cooling apparatus according to claim 1, wherein the cooling apparatus is provided.   2. The locking structure includes a bunt made of an elastic material having one end fixed to one end of the belt, and a locking piece provided with the other end of the belt and the other end of the band. Cooling system.

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