JP2013244635A - Concrete mixermobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete mixermobile capable of suppressing a temperature of open air during transport from affecting a ready mixed concrete so as to maintain a temperature in a fixed range.SOLUTION: A concrete mixermobile 1 has a rotatable mixer drum 2 and also has a temperature adjusting device 10 for relatively fluidizing a heating medium A along a wall surface of the mixer drum 2 to perform temperature adjustment for the mixer drum 2 by heat exchange with the heating medium A.

Description

  The present invention relates to a concrete mixer truck.

  Concrete is generally made by placing and hardening raw concrete mixed with materials such as cement, aggregate, and water. A concrete mixer truck is used when transporting ready-mixed concrete made in a ready-mixed factory to a construction site for constructing a concrete structure. The concrete mixer truck rotates the mixer drum during transportation to prevent separation of aggregate, water, etc. from the ready-mixed concrete and to homogenize the kneaded material.

  By the way, in summer, there is a problem that the mixer drum is exposed to hot weather and the ready-mixed concrete becomes hot during transportation. When ready-mixed concrete becomes hot, it tends to solidify in the mixer drum, and a fatal defect such as temperature cracking tends to occur during placement. In addition, when the moisture contained in the ready-mixed concrete is frozen during transportation in the winter, etc., initial hardening damage is likely to occur because the hardening is delayed at the time of placing and the strength of the concrete cannot be secured.

For this reason, measures are taken to maintain the temperature of ready-mixed concrete within a certain range (for example, about 20 ° C. to 30 ° C.) regardless of the outside air temperature while the concrete mixer truck travels from the ready-mixed factory to the construction site. .
In Patent Document 1 below, in order to protect the quality of the drum contents of a concrete mixer truck from the influence of temperature, solar radiation, etc., the outer surface of the drum body is made into a double structure using a honeycomb core, and a heat insulating material is provided inside. A mixer drum that employs a structure in which a metal plate is attached is disclosed.

Japanese Patent Laid-Open No. 9-277245

However, the above prior art has the following problems.
Since ready-mixed concrete generates heat due to the heat of hydration caused by the hydration reaction between cement and water, if the mixer drum has a heat-insulating structure, the internal heat cannot be released to the outside during transportation, but instead the ready-mixed concrete There is a problem that becomes high temperature.
Also, if the construction site is far away and the transportation time is long, even if it is a heat insulating structure, it will be gradually affected by the outside air temperature, and when it arrives at the construction site, the temperature of the ready-mixed concrete will be high or low. There is a problem that.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a concrete mixer truck capable of suppressing the influence on fresh concrete due to the outside air temperature during transportation and maintaining the temperature within a certain range.

  In order to solve the above problems, the present invention provides a concrete mixer truck having a rotatable mixer drum, wherein a heat medium is caused to flow relatively along a wall surface of the mixer drum, and The temperature adjustment device for adjusting the temperature of the mixer drum by heat exchange is provided.

  In the present invention, the temperature adjusting device integrally connects the outer shell that surrounds the outside of the mixer drum to form a space in which the heat medium flows, and the mixer drum and the outer shell. A configuration is adopted in which a plurality of spacers are provided interspersed between the mixer drum and the outer shell.

  Further, in the present invention, the temperature adjusting device employs a configuration in which a space around which the heat medium flows surrounds the outside of the mixer drum and the outer surface of the mixer drum is relatively rotatable. .

  In the present invention, the temperature adjusting device comprises: a heat exchanger that exchanges heat with the heat medium; and a circulation device that circulates the heat medium between the space and the heat exchanger. The structure of having is adopted.

  In the present invention, the outer shell has an inlet for introducing the heat medium into the space, and an outlet for discharging the heat medium from the space. The inlet and the outlet are A configuration is adopted in which the mixer drum has a positional relationship with the rotating shaft interposed therebetween.

  In the present invention, a configuration is adopted in which the introduction port and the discharge port are openable and closable.

  Moreover, in this invention, the said temperature control apparatus employ | adopts the structure that it is provided in the outer side of the said mixer drum spirally, and has the heat exchanger tube which the said heat medium flows inside.

  Moreover, in this invention, the structure that the said heat medium is a liquid is employ | adopted.

According to the present invention, the temperature of the ready-mixed concrete is positively generated without causing a temperature distribution by relatively flowing the heating medium along the wall surface of the rotatable mixer drum and by exchanging heat with the heating medium. Can be adjusted. For this reason, for example, in the summer, the temperature of the ready-mixed concrete can be actively lowered by flowing the cooled heat medium along the wall surface of the mixer drum. In the winter, the heated heat medium is mixed with the mixer. By flowing along the wall surface of the drum, the temperature of the ready-mixed concrete can be positively increased.
Therefore, in this invention, the concrete mixer truck which suppresses the influence on the ready-mixed concrete by the external temperature during conveyance and can hold | maintain temperature in a fixed range is obtained.

It is a block diagram of the concrete mixer truck in 1st Embodiment of this invention. It is a perspective view which shows the structure around the mixer drum in 1st Embodiment of this invention. It is a figure for demonstrating arrangement | positioning of the inlet and discharge port in 1st Embodiment of this invention. It is a figure for demonstrating the operation | movement and effect | action by the concrete mixer truck in 1st Embodiment of this invention. It is a block diagram of the concrete mixer truck in 2nd Embodiment of this invention. It is a perspective view which shows the structure of the temperature control apparatus in another embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is an overall configuration diagram of a concrete mixer truck 1 according to a first embodiment of the present invention. FIG. 2 is a perspective view showing a configuration around the mixer drum 2 in the first embodiment of the present invention. FIG. 3 is a view for explaining the arrangement of the introduction port 15 and the discharge port 16 in the first embodiment of the present invention.

  As shown in FIG. 1, a concrete mixer truck 1 has a mixer drum 2 on a loading platform of a vehicle main body (truck) 3. The outside of the mixer drum 2 of the present embodiment is covered with an outer shell 11. The mixer drum 2 is a rotatable cylindrical container supported by a bearing or the like. The mixer drum 2 accommodates ready-mixed concrete manufactured in a ready-mixed factory.

  As is well known, the mixer drum 2 is configured to be rotatable (forward rotation, reverse rotation) about the rotation axis L by a rotation drive mechanism 4 mounted on the vehicle body 3. Inside the mixer drum 2, a spiral mixing blade (not shown) is provided along the inner peripheral surface of the drum. When the blade rotates as the mixer drum 2 rotates, the raw material contained therein is provided. The concrete is moved by the blade and is moderately stirred.

  The concrete mixer truck 1 includes a temperature adjustment device 10 that relatively moves the heat medium A along the wall surface 2a of the mixer drum 2 and adjusts the temperature of the mixer drum 2 by heat exchange with the heat medium A. The temperature adjusting device 10 of the present embodiment actively adjusts the temperature of the mixer drum 2 so that the temperature of the ready-mixed concrete is within a certain range (for example, about 20 ° C. to 30 ° C.) even in summer and winter. The temperature is adjusted.

As the heat medium A, a cooling agent can be used in summer and a heating agent can be used in winter. The heat medium A of the present embodiment employs a liquid having a heat capacity larger than that of gas. As this liquid, water which is easily available and low in cost is preferable. In winter and the like, a liquid obtained by dissolving a predetermined solute in water to lower the freezing point, oil having a low freezing point, or the like may be used.
The temperature adjustment device 10 of this embodiment includes an outer shell 11, a spacer 12 (see FIG. 2), a heat exchanger 13, and a circulation device 14.

  The outer shell 11 forms a space S in which the heat medium A flows around the outside of the mixer drum 2. The outer shell 11 is a cylindrical container having a similar shape larger than that of the mixer drum 2. In the present embodiment, by providing the outer shell 11 with a certain distance outside the mixer drum 2, a double shell structure surrounding the fresh concrete accommodation space can be formed. The space S formed by this double shell structure faces substantially the entire area of the wall surface 2 a of the mixer drum 2.

  As shown in FIG. 2, a plurality of spacers 12 are provided interspersed between the mixer drum 2 and the outer shell 11. The spacer 12 has a column shape and is erected with respect to the wall surface 2 a of the mixer drum 2. The spacers 12 are arranged so that each one has a predetermined gap therebetween. In addition, the spacer 12 is configured to keep a constant space between the mixer drum 2 and the outer shell 11 and to integrally connect the two. For this reason, in this embodiment, the mixer drum 2 and the outer shell 11 rotate integrally.

  As shown in FIG. 1, the outer shell 11 has an inlet 15 for introducing the heat medium A into the space S, and an outlet 16 for discharging the heat medium A from the space S. In the present embodiment, in order to smoothly perform the discharge operation of the used heat medium A (refrigerant or heat medium) after heat exchange and the introduction operation of a new heat medium A, the introduction port 15 is provided at a position as high as possible. The outlet 16 is provided as low as possible.

  As shown in FIG. 3, the introduction port 15 and the discharge port 16 have a positional relationship with the rotation axis L of the mixer drum 2 interposed therebetween. In the present embodiment, the introduction port 15 and the discharge port 16 are provided at the positions of the counter electrodes displaced by 180 ° so that the discharge port 16 is positioned directly below when the introduction port 15 is positioned directly above. The introduction port 15 has a connection part 15a to which a dedicated hose can be attached and detached, and an on-off valve 15b for opening and closing the introduction port 15. Further, the discharge port 16 includes a connection portion 16a to which a dedicated hose can be attached and detached, and an opening / closing valve 16b for opening and closing the discharge port 16.

  As shown in FIG. 1, the heat exchanger 13 is mounted on the vehicle body 3. The heat exchanger 13 is configured to adjust the temperature of the heat medium A to a predetermined temperature by exchanging heat with the heat medium A discharged from the space S via the discharge port 16. As the heat exchanger 13, known ones such as a radiator type heat exchanger, a shell and tube type heat exchanger, a plate fin type heat exchanger, and the like can be used. For example, in summer, heat can be taken from the heat medium A by heat exchange between the cooler-cooled refrigerant and the heat medium A. In winter, heat can be applied to the heat medium A by heat exchange between the heat medium heated by the heater and the heat medium A.

  The circulation device 14 is configured to circulate the heat medium A between the space S and the heat exchanger 13. The circulation device 14 includes a hose 17 that connects between the heat exchanger 13 and the introduction port 15, a hose 18 that connects between the discharge port 16 and the heat exchanger 13, and a heat medium A that is circulated and pumped (not shown). And a pump. In this embodiment, as shown in FIG. 3, each of the connection portion 15a and the connection portion 16a has a screw structure. Therefore, the hose 17 is detachable from the introduction port 15 and the hose 18 is detachable from the discharge port 16.

Next, the operation and action of the concrete mixer truck 1 having the above configuration will be described with reference to FIG.
FIG. 4 is a diagram for explaining the operation and action of the concrete mixer truck 1 according to the first embodiment of the present invention.

  Fig.4 (a) has shown the mode of the concrete mixer truck 1 at the time of heading to a construction site from a ready-mix factory. The concrete mixer truck 1 accommodates ready-mixed concrete in a mixer drum 2 in a ready-mix factory and travels toward a construction site. At this time, about half the capacity of the heat medium A is stored in the space S, the inlet 15 is closed by the on-off valve 15b, and the outlet 16 is closed by the on-off valve 16b (see FIG. 3). . Moreover, the hose 17 is removed from the connection part 15a, and the hose 18 is removed from the connection part 16a.

  The mixer drum 2 rotates around the rotation axis L until it arrives at the construction site from the ready-mix factory, and appropriately mixes the ready-mixed concrete. When the mixer drum 2 rotates, the outer shell 11 connected via the spacer 12 also rotates integrally. The heat medium A is stored in the space S between the mixer drum 2 and the outer shell 11, and relatively flows along the wall surface 2a as the mixer drum 2 rotates.

  Since the spacers 12 are provided interspersed between the mixer drum 2 and the outer shell 11, the heat medium A can freely flow in the gap between the spacers 12 and 12 (see FIG. 2). . Further, since the mixer drum 2 rotates about the rotation axis L, even when the heat medium A stored in the space S is about half, the heat medium A can flow over substantially the entire area of the wall surface 2a. it can. As described above, according to the present embodiment, the heat medium A is caused to flow relatively along the wall surface 2a of the rotatable mixer drum 2, thereby causing no temperature distribution and between the heat medium A and the heat medium A. The temperature of ready-mixed concrete can be positively adjusted by heat exchange.

  For example, in the summertime, the temperature of the ready-mixed concrete can be actively reduced by flowing the precooled heat medium A along the wall surface of the mixer drum 2, and in the wintertime, the preheated heat medium A Can be made to flow along the wall surface of the mixer drum 2, so that the temperature of the ready-mixed concrete can be positively increased. In this embodiment, in order to prevent kinking of the pipe due to the rotation of the mixer drum 2, the hoses 17 and 18 are removed and the heat exchanger 13 is not used during traveling, but a liquid having a large heat capacity is adopted as the heat medium A. Thus, for example, even in summer when the outside air temperature is 30 ° C. to 40 ° C. or in the winter where the outside air temperature is −10 ° C. to 0 ° C., the temperature of the ready-mixed concrete is kept within a certain range (for example, 20 ° C. to 30 ° C. Degree). For this reason, generation | occurrence | production of the temperature crack in a construction site, initial stage frost damage, etc. can be suppressed.

  FIG.4 (b) has shown the mode of the concrete mixer truck 1 at the time of returning to a ready-mixed factory from a construction site. The concrete mixer truck 1 travels toward a ready-mixed factory to transport the next ready-mixed concrete after unloading ready-mixed concrete at a construction site. At this time, the hose 17 is connected to the connection portion 15a, and the hose 18 is connected to the connection portion 16a. Further, the inlet 15 is opened by the on-off valve 15b, and the discharge port 16 is opened by the on-off valve 16b.

On the way back from the construction site to the ready-mix factory, the rotation of the mixer drum 2 is stopped, and the hoses 17 and 18 are connected to the heat exchanger 13 to exchange heat with the heat medium A. Since the introduction port 15 and the discharge port 16 have a positional relationship with the rotation axis L of the mixer drum 2 interposed therebetween, the introduction port 15 is located as high as possible and the discharge port 16 is located as low as possible. The operation of discharging the used heat medium A (refrigerant or heat medium) after heat exchange and the operation of introducing a new heat medium A by the circulation device 14 can be performed smoothly. The heat medium A discharged from the space S is temperature-adjusted to an initial temperature in the heat exchanger 13 and introduced into the space S again.
In this way, by adjusting the temperature of the heat medium A on the way back from the construction site to the ready-mixed factory, preparation for transporting the next ready-mixed concrete can be performed smoothly.

  Therefore, according to the above-described embodiment, the concrete mixer truck 1 having the rotatable mixer drum 2 is configured to flow the heat medium A relatively along the wall surface of the mixer drum 2 and The temperature of the ready-mixed concrete can be positively adjusted by adopting the configuration in which the temperature adjusting device 10 that adjusts the temperature of the mixer drum 2 by heat exchange is provided. For this reason, in this embodiment, the concrete mixer truck 1 which suppresses the influence on the ready-mixed concrete by the outside temperature during conveyance and can hold | maintain temperature in a fixed range is obtained.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

FIG. 5 is a configuration diagram of the concrete mixer truck 1 according to the second embodiment of the present invention.
As shown in FIG. 5, the second embodiment differs from the above embodiment in that the mixer drum 2 can be rotated relative to the outer shell 11.

  In the second embodiment, the outer shell 11 is fixed to the vehicle main body 3 by the fixing member 19, and only the mixer drum 2 is rotatable. According to this configuration, even if the mixer drum 2 rotates, the outer shell 11 is fixed to the vehicle main body 3 so that it does not rotate. Therefore, the heat exchanger 13 and the circulation device 14 can be always operated even when heading from the ready-mix factory to the construction site as shown in FIG.

  As described above, in the second embodiment, since the heat exchanger 13 and the circulation device 14 can be operated at all times, even if the construction site is far away and the transportation time becomes long, it does not depend on the outside air temperature. Moreover, the temperature of ready-mixed concrete can be easily maintained within a certain range (for example, about 20 ° C. to 30 ° C.). Moreover, since the inlet 15 is always located at a high position, the heat medium A can be introduced into the space S from above. Since the heat medium A introduced from above can exchange heat with the upper part of the mixer drum 2, for example, heat can be exchanged over the entire wall surface 2a of the mixer drum 2 without storing more than half of the heat medium A in the space S. It becomes.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

For example, in the above-described embodiment, the configuration in which the outer shell 11 is provided outside the mixer drum 2 to form a double shell structure and the heat medium A flows in the space S has been described, but the present invention is limited to this configuration. For example, a configuration as shown in FIG. 6 may be adopted.
FIG. 6 is a perspective view showing the configuration of the temperature adjustment device 10 in another embodiment of the present invention.
In another embodiment shown in FIG. 6, the temperature adjusting device 10 includes a heat transfer tube 20 that is provided spirally outside the mixer drum 2 and through which the heat medium A flows. According to this configuration, the heat medium can be relatively fluidized along the wall surface 2 a of the mixer drum 2, so that positive heat exchange can be performed over substantially the entire mixer drum 2.

  For example, in the above-described embodiment, the configuration in which the opening / closing valve 15b is provided in the introduction port 15 and the opening / closing valve 16b is provided in the discharge port 16 has been described. However, the present invention is not limited to this configuration. A cap member that can be screwed into the screw structure may be employed instead of the on-off valves 15b and 16b using the screw structure of 16a.

  DESCRIPTION OF SYMBOLS 1 ... Concrete mixer truck, 2 ... Mixer drum, 2a ... Wall surface, 3 ... Vehicle main body, 10 ... Temperature control apparatus, 11 ... Outer shell, 12 ... Spacer, 13 ... Heat exchanger, 14 ... Circulation apparatus, 15 ... Inlet , 16 ... discharge port, 20 ... heat transfer tube, A ... heat medium, L ... rotating shaft, S ... space

Claims (8)

A concrete mixer truck having a rotatable mixer drum,
A concrete mixer truck, comprising: a temperature adjusting device that causes a heat medium to flow relatively along a wall surface of the mixer drum and adjusts the temperature of the mixer drum by heat exchange with the heat medium. The temperature adjusting device is:
An outer shell surrounding the outside of the mixer drum to form a space in which the heat medium flows;
2. A plurality of spacers that integrally connect the mixer drum and the outer shell and that are provided in a scattered manner between the mixer drum and the outer shell. Concrete mixer truck as described in   2. The concrete according to claim 1, wherein the temperature adjusting device forms a space in which the heat medium flows around the outside of the mixer drum, and the mixer drum has an outer shell capable of relative rotation. Mixer truck. The temperature adjusting device is:
A heat exchanger for exchanging heat with the heat medium;
The concrete mixer truck according to claim 2, further comprising a circulation device that circulates the heat medium between the space and the heat exchanger. The outer shell has an inlet for introducing the heat medium into the space, and an outlet for discharging the heat medium from the space,
The concrete mixer truck according to any one of claims 2 to 4, wherein the introduction port and the discharge port have a positional relationship with a rotating shaft of the mixer drum interposed therebetween.   The concrete mixer truck according to claim 5, wherein the introduction port and the discharge port are openable and closable.   2. The concrete mixer truck according to claim 1, wherein the temperature adjusting device includes a heat transfer tube provided spirally outside the mixer drum and through which the heat medium flows.   The concrete mixer truck according to claim 1, wherein the heat medium is a liquid.

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