Temperature controller and temperature control method of fresh concrete of agitator vehicle

Abstract

PURPOSE: To provide a temperature controller and a temperature control method of fresh concrete of an agitator vehicle capable of efficiently and securely managing a temperature of fresh concrete received in a drum, and allowing application without large modification of the agitator vehicle.CONSTITUTION: A temperature controller of fresh concrete in an agitator vehicle is configured to arrange a Peltier element on a drum surface of the agitator vehicle in a face contact state to make a side in face contact with the drum surface to be a cooling surface or a heating surface, and a temperature control method of the fresh concrete of the agitator vehicle is to control a temperature of the fresh concrete in the drum through cooling or heating the drum surface by arranging the Peltier element on the drum surface of the agitator vehicle in the face contact state and supplying power to the Peltier element so as to make the side in face contact with the drum surface of the Peltier element to be the cooling surface or the heating surface.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a temperature control device and a temperature control method for fresh concrete in an agitator vehicle, and more particularly, to a device and a method for adjusting the temperature to prevent deterioration of the quality of the fresh concrete in the drum when fresh concrete produced in a concrete factory is placed in the drum of an agitator vehicle and transported to a construction site. [Background technology]

[0002] Fresh concrete produced at a concrete plant is generally transported to the site in the drum of an agitator truck. During this transportation, if the temperature of the fresh concrete in the drum rises above a specified value due to high temperatures during the summer, direct sunlight, or the heat of hydration of the fresh concrete itself, there is a risk of the quality decreasing. For fresh concrete manufactured within the quality limits set by JIS (Japan Industrial Standards), the Japan Society of Civil Engineers, the Architectural Institute of Japan, etc., the allowable time from mixing to the end of pouring is within 2.0 hours if the average daily temperature is below 25°C, and within 1.5 hours if it exceeds 25°C. The allowable time from mixing to the arrival at the unloading point is also within 1.5 hours regardless of the outside temperature. In addition, the temperature of concrete when poured is set at 35°C or below.

[0003] The relative relationship between the temperature change of materials and that of fresh concrete is generally said to be that for a temperature change of cement ±8°C, water ±4°C, and aggregate ±2°C, the temperature change of fresh concrete is ±1°C. Therefore, if the temperature of the materials rises during transportation due to direct sunlight or high outside temperatures, or the temperature of the fresh concrete rises due to hydration reactions, and falls outside the range specified by JIS etc., this can cause problems such as an increased risk of defects such as cold joints.

[0004] Therefore, a technology has been proposed to suppress the temperature rise of the drum containing the fresh concrete, thereby suppressing the temperature rise of the fresh concrete inside the drum and preventing deterioration in the quality of the fresh concrete during transport (for example, see Patent Documents 1 to 5).

[0005] Patent Document 1 describes a configuration in which a cooling pan that stores a cooling medium is disposed below a drum, and the lower part of the rotating drum is immersed in the cooling medium in the cooling pan to cool the drum.

[0006] Patent Document 2 describes a configuration in which a plurality of water injection ports are intermittently arranged along the longitudinal direction of a drum, and water is dispersed and sprayed over the entire surface of the rotating drum to cool the drum.

[0007] Patent document 3 describes a configuration in which two pipes are arranged above and below a drum, water is pumped from a water tank and sprayed onto the surface of the drum, and the drum is cooled by the heat of vaporization generated when the sprayed water evaporates on the drum surface.

[0008] Patent document 4 describes a configuration in which a water-transporting sheet with multiple grooves formed on its surface is placed on the surface of a drum, water channels are formed by the grooves in the sheet and the drum surface, and the drum is cooled by supplying water to this channel.

[0009] Patent Document 5 describes a configuration in which an outer shell is provided on the outside of a drum, and a heat transfer medium is caused to flow in the gap between the drum and the outer shell, thereby regulating the temperature of the drum. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Patent No. 4601384 [Patent Document 2] Patent Publication No. 2008-246816 [Patent Document 3] Utility model registration No. 3154220 [Patent Document 4] Patent Publication No. 2017-170863 [Patent Document 5] Patent Publication No. 2013-244635 Summary of the Invention [Problem to be solved by the invention]

[0011] In the techniques of Patent Documents 1 to 5, a fluid refrigerant mainly made of water is used as the cooling means. In the cooling configuration using this fluid refrigerant, in any of the techniques of Patent Documents 1 to 5, modifications such as the addition of a specific mechanism for cooling (for example, a cooling pan in Patent Document 1) are essential.

[0012] Furthermore, when water is used as the cooling medium, a large amount of water is lost through evaporation during the hottest months of the year, especially during sunny days in midsummer, when cooling of the fresh concrete in the drum is most necessary. Therefore, in order to maintain stable and continuous cooling, it is necessary to constantly replenish water, and heavy items such as a replenishment tank and replenishment water must be carried on the vehicle. The maximum load capacity of an agitator vehicle, which is a type of freight vehicle, is regulated by laws such as the Road Traffic Act and the Trucking Business Act, and the volume of fresh concrete that can be loaded is limited to several levels so as to fall within the range of the regulations. Therefore, when a refill tank and refill water are loaded, their weight is also added, so it is necessary to reduce the load capacity of fresh concrete by the weight of the refill tank and refill water, or to use a vehicle with a maximum load capacity of a higher level.

[0013] Furthermore, in the case of the technology of Patent Document 5, it is not enough to simply add a specific cooling mechanism to an existing agitator vehicle; it is necessary to manufacture a tank with a special configuration (a double-structure tank with an outer shell) and use this in a newly designed and newly manufactured agitator vehicle.

[0014] Therefore, the cooling configurations using a fluid refrigerant described in Patent Documents 1 to 5, etc., have the problem that high costs are unavoidable, such as requiring significant modifications to the agitator vehicle, increasing the size of the vehicle, or requiring a newly designed and newly manufactured vehicle.

[0015] Therefore, an object of the present invention is to provide a temperature control device and a temperature control method for fresh concrete in an agitator car, which can efficiently and reliably control the temperature of fresh concrete contained in a drum and can be applied without significantly modifying the agitator car. [Means for solving the problem]

[0016] The present invention, which solves the above problems, has the following configuration.

[0017] 1. A temperature control device for fresh concrete in an agitator vehicle, characterized in that a Peltier element is arranged in surface contact with the drum surface of the agitator vehicle, and the side in surface contact with the drum surface is used as the cooling surface or heating surface.

[0018] 2. A fresh concrete temperature control device for an agitator vehicle as described in 1 above, characterized in that it is configured to have a measuring unit that measures either or both of the temperature of the drum and the temperature of the fresh concrete inside the drum, and a control unit that controls the power supply to the Peltier element based on the temperature measured by the measuring unit.

[0019] 3. The temperature control device for fresh concrete of an agitator vehicle as described in 1 or 2 above, characterized in that the Peltier element is detachably arranged on the drum of an existing agitator vehicle.

[0020] 4. A temperature control device for fresh concrete of an agitator truck described in 1 or 2 above, characterized in that a Peltier element is attached to one side of a breathable sheet body, and the sheet body is attached to the drum surface so that this one side is in close contact with the drum surface.

[0021] 5. A temperature control device for fresh concrete of an agitator truck described in 1 or 2 above, characterized in that a Peltier element is attached to one side of an insulating sheet body, and the sheet body is attached to the drum surface so that this one side is in close contact with the drum surface.

[0022] 6. A temperature control device for fresh concrete of an agitator vehicle as described in 1 or 2 above, characterized in that the Peltier elements are arranged in a series in the form of multiple strips, and the multiple strip-shaped Peltier elements are wound around the drum surface.

[0023] 7. A temperature control device for fresh concrete in an agitator truck as described in 1 or 2 above, characterized in that by changing the polarity of the Peltier element, the side in surface contact with the drum surface becomes the cooling surface in hot weather and the heating surface in cold weather.

[0024] 8. A temperature control device for fresh concrete of an agitator car described in 1 or 2 above, characterized in that the power supply unit of the Peltier element is arranged on the body side of the agitator car and power is supplied from the power supply unit to the Peltier element via a slip ring or a trolley wire.

[0025] 9. A temperature control device for fresh concrete in an agitator car as described in 1 or 2 above, characterized in that a sunshade member that suppresses direct exposure of the drum to sunlight is provided in the agitator car.

[0026] 10. A method for controlling the temperature of fresh concrete in an agitator vehicle, comprising: arranging a Peltier element in surface contact with the drum surface of the agitator vehicle; and supplying power to the Peltier element so that the side of the Peltier element in surface contact with the drum surface becomes the cooling surface or heating surface, thereby controlling the temperature of the fresh concrete in the drum by cooling or heating the drum surface.

[0027] 11. A method for controlling the temperature of fresh concrete in an agitator vehicle as described in claim 10, characterized in that the temperature of the drum of the agitator vehicle is cooled to a range of 20 to 35°C when the average daytime air temperature exceeds 25°C.

[0028] 12. A method for controlling the temperature of fresh concrete in an agitator truck as described in claim 10, characterized in that the temperature of the drum of the agitator truck before loading fresh concrete during hot weather is pre-cooled to be within the range of 20 to 35°C.

[0029] 13. A method for controlling the temperature of fresh concrete in an agitator truck as described in claim 10, characterized in that the temperature of the drum of an agitator truck loaded with fresh concrete during hot weather is cooled to within the range of 5 to 20°C.

[0030] 14. A method for controlling the temperature of fresh concrete in an agitator truck as described in claim 10, characterized in that the drum of the agitator truck is heated to a temperature within the range of 5 to 20°C when the average daytime air temperature falls below 4°C.

[0031] 15. A method for controlling the temperature of fresh concrete in an agitator truck as described in claim 10, characterized in that the drum of the agitator truck before loading fresh concrete in cold weather is preheated to a temperature within the range of 5 to 20°C.

[0032] 16. A method for controlling the temperature of fresh concrete in an agitator truck as described in claim 10, characterized in that the drum of the agitator truck loaded with fresh concrete in cold weather is heated so that the temperature is within the range of 5 to 20°C. Effect of the Invention

[0033] According to the invention as set forth in claim 1 or 10, it is possible to provide a temperature control device and a temperature control method for fresh concrete in an agitator truck, which can efficiently and reliably control the temperature of the fresh concrete contained in a drum and can be applied without significantly modifying the agitator truck.

[0034] In particular, since water is not the main refrigerant, there is no risk of refrigerant leakage, and there is no need to add specific mechanisms that are heavy, such as a refill tank, refill water, and a mechanism for supplying water, etc. Therefore, it is possible to control the temperature of the drum and the fresh concrete contained in the drum by simply adding a simple structure, without increasing the weight of the maximum load capacity. Furthermore, since the Peltier element has good temperature response, it is possible to start cooling or heating quickly.

[0035] According to the invention recited in claim 2, the temperature of the fresh concrete being transported can be controlled to a desired temperature that allows quality maintenance based on the measured temperature.

[0036] According to the invention recited in claim 3, it can be extremely easily applied to existing agitator vehicles.

[0037] According to the invention recited in claim 4, when the side in surface contact with the drum is used as the cooling surface, the sheet body side becomes the heating surface, but since this sheet body has air permeability, it is possible to dissipate heat, thereby preventing or suppressing a decrease in thermal efficiency. Examples of the air permeable sheet body include a mesh sheet and a net-like sheet.

[0038] According to the invention shown in claim 5, since the side in surface contact with the drum is used as the heating surface and heating efficiency can be maintained when the temperature drops in winter, it is possible to prevent the drum and the fresh concrete in the drum from becoming cold. Examples of the sheet body having heat insulating properties include a sheet coated with foamed resin, an aluminum vapor deposition sheet, and a quilted sheet.

[0039] According to the invention recited in claim 6, the belt-shaped Peltier element can be disposed on the drum surface simply by winding it around the drum surface.

[0040] According to the invention set forth in claim 7, by changing the polarity of the Peltier element, the drum and the fresh concrete contained in the drum can be cooled in the summer and heated in the winter, so that the fresh concrete can be controlled to an appropriate temperature range throughout the year.

[0041] According to the invention recited in claim 8, an on-board battery or the like can be used as the power source for the Peltier element. In addition, by utilizing a slip ring or the like, it is possible to supply power to the Peltier element disposed on the drum, which is a rotating body, using existing technology.

[0042] According to the invention recited in claim 9, by placing the drum in the shade, it is possible to suppress or prevent the temperature of the drum from increasing due to direct sunlight.

[0043] According to the invention recited in claim 11, the quality of fresh concrete during transportation can be maintained during the period when hot weather concreting is required.

[0044] According to the invention as set forth in claim 12, in hot weather when the daily average temperature exceeds 25°C, the drum, which directly transfers heat to the fresh concrete, can be cooled before loading the fresh concrete, thereby making it possible to maintain the fresh concrete to be loaded at a temperature of 35°C or less, which is a temperature at which the quality of the concrete can be maintained.

[0045] According to the invention recited in claim 13, in hot weather when the daily average temperature exceeds 25°C, the drum through which heat is directly transferred to the fresh concrete can be cooled, thereby keeping the temperature of the fresh concrete loaded in the drum at 35°C or below, which is a temperature at which the quality of the concrete can be maintained.

[0046] According to the invention as set forth in claim 14, the quality of fresh concrete can be maintained during transportation during the period when cold weather concreting must be taken into consideration.

[0047] According to the invention set forth in claim 15, in cold weather when the daily average temperature is below 4°C, the drum, which directly transfers heat to the fresh concrete, can be preheated before loading the fresh concrete, thereby making it possible to maintain the fresh concrete at a temperature of 5°C or higher, which is sufficient to maintain its quality.

[0048] According to the invention recited in claim 16, by heating the drum through which heat is directly transferred to the fresh concrete during cold weather when the daily average air temperature is below 4°C, the fresh concrete loaded in the drum can be maintained at a temperature of 5°C or higher, which is a temperature at which the quality of the concrete can be maintained. [Brief description of the drawings]

[0049] [Figure 1] FIG. 1 is a schematic diagram showing an embodiment of a temperature control device for fresh concrete in an agitator truck according to the present invention; [Diagram 2] FIG. 1 is a schematic perspective view showing an example of an arrangement of Peltier elements on a drum surface; [Diagram 3] FIG. 1 is a partial schematic plan view showing an example of a mounting configuration of a Peltier element on a drum surface; [Figure 4] FIG. 1 is a partial schematic cross-sectional view showing an example of a mounting configuration of a Peltier element on a drum surface. [Diagram 5] FIG. 1 is a schematic perspective view showing an example of a sunshade member; [Figure 6] FIG. 6 is a schematic diagram showing an example of a configuration in which the sunshade member shown in FIG. 5 is added to the agitator vehicle shown in FIG. [Figure 7] FIG. 13 is a partially schematic perspective view showing another example of a mounting configuration of a Peltier element on a drum surface. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0050] Hereinafter, a temperature control device and a temperature control method for fresh concrete of an agitator truck according to the present invention (hereinafter, sometimes simply referred to as a temperature control device and a temperature control method) will be described.

[0051] As mentioned above, for fresh concrete manufactured within the quality ranges stipulated by JIS (Japan Industrial Standards), the Japan Society of Civil Engineers, the Architectural Institute of Japan, etc., the allowable time from mixing to the end of pouring is within 2.0 hours when the average daily temperature is below 25°C, and within 1.5 hours when it exceeds 25°C, and the allowable time from mixing to arrival at the unloading point is within 1.5 hours regardless of the outside temperature. In addition, the temperature of concrete when poured is set at 35°C or less.

[0052] If the average daily temperature is below 25°C, no special adjustments are required to the temperature of the fresh concrete while it is being transported by the agitator truck, and care should be taken to allow it to cure after pouring. However, during hot weather when the average daily temperature is over 25°C, the temperature of the drum of the agitator truck rises not only due to the outside temperature but also due to exposure to direct sunlight, and the heat from this hot drum is transferred directly to the fresh concrete inside, causing an increase in temperature and a deterioration in quality. In order to prevent deterioration in quality, it is necessary to adjust the temperature of drum 2 so that the temperature of the fresh concrete in drum 2 does not exceed 35°C during hot weather.

[0053] In other words, if the drum temperature of the agitator truck when transporting fresh concrete during times when the average daily temperature is 25°C or higher is cooled (temperature adjustment / temperature control) to the drum temperature when the average daily temperature is below 25°C, it will be possible to maintain the quality of the fresh concrete during transport.

[0054] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A temperature control device and a temperature control method according to the present invention will now be described with reference to the accompanying drawings. As shown in Figures 1 and 2, The temperature control device of the present invention is mainly configured such that a Peltier element 3 is disposed in surface contact with the surface of a drum 2 of an agitator wheel 1, and the side in surface contact with the drum 2 surface serves as a cooling surface. The temperature control method of the present invention mainly comprises a configuration in which a Peltier element 3 is disposed in surface contact with the surface of a drum 2 of an agitator vehicle 1, and power is supplied to the Peltier element 3 so that the side of the Peltier element 3 in surface contact with the surface of the drum 2 serves as a cooling surface, thereby cooling the surface of the drum 2 and controlling the temperature of fresh concrete in the drum 2.

[0055] As shown in FIGS. 1 and 2, a large number of Peltier elements 3 are attached at appropriate intervals over the entire surface of the drum 2 in order to efficiently cool substantially the entire drum 2. The number of units to be installed is determined appropriately according to the capacity of the drum 2 and the cooling capacity of the Peltier element 3. For example, if the agitator vehicle 1 is a 10-ton vehicle and the capacity of the drum 2 is about 4.0 to 4.4 m 3 In this case, by using 90 Peltier elements of 30W each, it is possible to remove heat energy equivalent to 1870W (calculated based on an efficient operating rate of 70% of 30W x 90 elements = 2700W), in other words, it has the cooling capacity to quickly lower the drum temperature, which is sufficient even during periods of extreme heat.

[0056] Furthermore, the mounting configuration of the Peltier element 3 to the drum 3 is preferably configured so that the Peltier element 3 can be detached from the drum 2 of an existing agitator vehicle 1 so that it can be applied to an agitator vehicle of an existing general configuration without making major modifications to the existing agitator vehicle, such as adding a cooling pan, cooling water tank, etc., or using a newly designed or newly manufactured agitator vehicle equipped with a tank having a dedicated configuration, such as a double-structure cooling tank with an outer shell.

[0057] An example of a detachable configuration of the Peltier element 3 is a configuration in which the Peltier element 3 is attached to one surface of a breathable sheet body 4, and the sheet body 4 is attached to the surface of the drum 2 so that the one surface side is in close contact with the surface of the drum 2, as shown in Fig. 3. In Fig. 3, reference numeral 31 denotes wiring for the Peltier element 3. When one surface of the Peltier element 3 is a cooling surface, the other surface serves as a heat dissipation surface (heating surface). In other words, when the side in surface contact with the drum 2 is the cooling surface, the sheet body 4 side serves as the heating surface, but since this sheet body 4 has air permeability, it is possible to dissipate heat. Therefore, it is possible to prevent or suppress a decrease in thermal efficiency. Examples of the air permeable sheet body 4 include a mesh sheet and a net-like sheet as shown in FIG. 3.

[0058] 4, a configuration in which a plurality of Peltier elements 3 are connected in a belt shape and the plurality of belt-shaped Peltier elements 3 are wound around the surface of the drum 2 can also be used. The number of belts can be increased or decreased according to the required cooling capacity. In FIG. 4, reference numeral 31 denotes wiring for the Peltier elements 3.

[0059] As described above, it is preferable that the Peltier element 3 disposed on the surface of the drum 2 has a power supply unit disposed on the body side of the agitator car 1, and is configured to supply power from this power supply unit via a slip ring or a trolley wire. In the embodiment shown in Fig. 2, a trolley wire 5 is used. Note that any known and publicly used slip ring and trolley wire can be used without any particular restrictions. As the power supply unit, an existing vehicle battery or an additional vehicle battery can be used.

[0060] In addition, it is preferable that the temperature control device of the present invention is configured to have a measuring unit that measures either or both of the temperature of the drum 2 and the temperature of the fresh concrete in the drum 2, and a control unit that controls the power supply to the Peltier element 3 based on the temperature measured by the measuring unit. According to this configuration, the temperature of the fresh concrete being transported can be controlled to a desired temperature that allows quality maintenance based on the measured temperature.

[0061] First, when the daily average temperature exceeds 25°C, the temperature of the drum 2 of the agitator wheel 1 is cooled to within a range of 20 to 35°C. According to this configuration, by cooling the drum 2, which directly transfers heat to the fresh concrete during hot weather when the daily average temperature exceeds 25°C, the fresh concrete can be maintained at a temperature of 35°C or less, which is a temperature at which the quality of the concrete can be maintained.

[0062] Cooling of the drum 2 by the Peltier element 3 is preferably performed so that the temperature of the drum 2 is within the range of 20 to 35°C. Examples of the cooling include a configuration in which the drum 2 is cooled in advance before the fresh concrete is loaded, and a configuration in which the drum 2 is cooled after the fresh concrete has been loaded.

[0063] According to the temperature control device and temperature control method of the present invention, it is possible to efficiently and reliably control the temperature of the fresh concrete contained in the drum 2, and further, it is possible to apply the device and method without significantly modifying the agitator vehicle 1. In particular, since water is not the main refrigerant, there is no risk of refrigerant leakage, and there is no need to add specific mechanisms that are heavy, such as a refill tank, refill water, and a mechanism for supplying water, etc. Therefore, it is possible to control the temperature of the drum 2 and the fresh concrete contained in the drum by simply adding a simple structure, without increasing the weight of the maximum load capacity. In addition, the Peltier element 3 has good temperature response, so that cooling can begin quickly.

[0064] In the temperature control device of the present invention described above, in order to further improve the cooling effect, a sunshade member 6 as shown in Fig. 5 for suppressing direct irradiation of sunlight on the drum 2 may be provided on the agitator wheel 1 as shown in Fig. 6. In Figs. 5 and 6, reference numeral 61 denotes a framework such as a pillar member or a beam member that supports the sunshade member 6, and reference numeral 62 denotes a light-shielding sheet. According to this configuration, by placing the drum 2 in the shade, it is possible to suppress or prevent a temperature rise of the drum 2 due to direct sunlight. Therefore, the cooling effect of the Peltier element 3 can be exhibited more efficiently.

[0065] The temperature control device and the temperature control method of the present invention are applicable not only to the above-mentioned hot weather concreting, but also to cold weather concreting. That is, in the above-mentioned temperature control device and method for fresh concrete in hot weather, the side of the Peltier element 3 that comes into contact with the drum 2 is used as the cooling surface, but in cold weather, the side of the Peltier element 2 that comes into contact with the drum 2 is used as the heating surface.

[0066] By simply changing the polarity of the Peltier element 3, it is possible to switch between a cooling surface and a heating surface on the side that comes into surface contact with the surface of the drum 2. By switching the polarity of this Peltier element, the drum 2 and the fresh concrete contained in the drum 2 can be cooled in the summer and heated in the winter, so that the fresh concrete can be controlled to an appropriate temperature range throughout the year.

[0067] That is, the drum 2 of the agitator wheel 1 can be heated to a temperature within a range of 5 to 20°C when the daily average air temperature is 4°C or lower. According to this configuration, by heating drum 2, which directly transfers heat to fresh concrete, in cold weather when the average daily temperature is below 4°C, the fresh concrete can be maintained at a temperature of 5°C or higher, which is a temperature at which the quality of the concrete can be maintained.

[0068] It is preferable that the drum 2 is heated by the Peltier element 3 so that the temperature of the drum 2 is within a range of 5 to 20°C. Examples of the heating method include a method in which the drum 2 is preheated before the fresh concrete is loaded, and a method in which the drum 2 is heated after the fresh concrete has been loaded.

[0069] During cold weather when the daily average temperature is below 4°C, it is preferable to use a heat-insulating sheet body 4 as shown in Fig. 7 instead of a breathable sheet body 4 in order to make heating by the Peltier element 3 more effective. The Peltier element 3 is attached to one surface of this heat-insulating sheet body 4, and the sheet body 4 is attached to the surface of the drum 2 so that this one surface is in close contact with the drum 2 surface. According to this configuration, the side in surface contact with the drum 2 serves as the heating surface, and heating efficiency can be maintained when temperatures drop in winter, thereby preventing the drum 2 and the fresh concrete inside the drum 2 from becoming colder. Examples of the sheet body 4 having thermal insulation properties include a sheet coated with foamed resin, an aluminum vapor deposition sheet, and a quilted sheet. [Explanation of symbols]

[0070] 1 Agitator car 2 Drums 3 Peltier element 31 Wiring 4 Sheet body 5. Trolley Wire 6 Sunshade materials 61 Skeleton 62 Blackout Sheet

Claims

1. A temperature control device for fresh concrete of an agitator vehicle, characterized in that a Peltier element is arranged in surface contact with the drum surface of the agitator vehicle, and the side in surface contact with the drum surface is configured as a cooling surface or a heating surface.

2. The temperature control device for fresh concrete of an agitator truck according to claim 1, characterized in that it is configured to have a measuring unit that measures either or both of the temperature of the drum and the temperature of the fresh concrete in the drum, and a control unit that controls the power supply to the Peltier element based on the temperature measured by the measuring unit.

3. 3. The temperature control device for fresh concrete of an agitator vehicle according to claim 1, wherein the Peltier element is detachably mounted on the drum of an existing agitator vehicle.

4. 3. The temperature control device for fresh concrete of an agitator truck as described in claim 1 or 2, characterized in that a Peltier element is attached to one side of a breathable sheet body, and the sheet body is attached to the drum surface so that this one side is in close contact with the drum surface.

5. 3. The temperature control device for fresh concrete of an agitator truck as described in claim 1 or 2, characterized in that a Peltier element is attached to one side of a heat-insulating sheet body, and the sheet body is attached to the drum surface so that this one side is in close contact with the drum surface.

6. 3. The temperature control device for fresh concrete of an agitator vehicle according to claim 1, wherein the Peltier elements are arranged in a plurality of bands, and the plurality of band-shaped Peltier elements are wound around the surface of the drum.

7. The temperature control device for fresh concrete of an agitator truck according to claim 1 or 2, characterized in that by changing the polarity of the Peltier element, the side in surface contact with the drum surface becomes the cooling surface in hot weather and the heating surface in cold weather.

8. 3. The temperature control device for fresh concrete of an agitator car according to claim 1, wherein a power supply unit for the Peltier element is arranged on the body side of the agitator car, and power is supplied from the power supply unit to the Peltier element via a slip ring or a trolley wire.

9. 3. The temperature control device for fresh concrete of an agitator car according to claim 1, further comprising a sunshade member provided on the agitator car to suppress direct irradiation of sunlight onto the drum.

10. A method for controlling the temperature of fresh concrete in an agitator vehicle, comprising the steps of: arranging a Peltier element in surface contact with the drum surface of the agitator vehicle; and supplying power to the Peltier element so that the side of the Peltier element in surface contact with the drum surface becomes a cooling surface or a heating surface, thereby cooling or heating the drum surface to control the temperature of the fresh concrete in the drum.

11. The method for controlling the temperature of fresh concrete in an agitator vehicle according to claim 10, characterized in that the temperature of the drum of the agitator vehicle is cooled to within the range of 20 to 35 ° C when the daily average air temperature exceeds 25 ° C.

12. The method for controlling the temperature of fresh concrete in an agitator truck according to claim 10, characterized in that the temperature of the drum of the agitator truck before loading fresh concrete in hot weather is cooled in advance to a range of 20 to 35°C.

13. The method for controlling the temperature of fresh concrete in an agitator truck according to claim 10, characterized in that the temperature of the drum of the agitator truck loaded with fresh concrete during hot weather is cooled to be within the range of 5 to 20°C.

14. The method for controlling the temperature of fresh concrete in an agitator vehicle according to claim 10, characterized in that the drum of the agitator vehicle is heated to a temperature within the range of 5 to 20 ° C when the daily average air temperature is 4 ° C or lower.

15. The method for controlling the temperature of fresh concrete in an agitator truck according to claim 10, characterized in that the drum of the agitator truck before loading fresh concrete in cold weather is preheated to a temperature within the range of 5 to 20 ° C.

16. The method for controlling the temperature of fresh concrete in an agitator truck according to claim 10, characterized in that the drum of the agitator truck loaded with fresh concrete in cold weather is heated to a temperature within the range of 5 to 20°C.

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