JP2008246816A - Method and apparatus for adjusting temperature of drum of track agitator for transporting ready-mixed concrete - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drum temperature adjusting manufacturing which adjusts the temperature of a drum by utilizing the water in a washing water tank currently installed on a track agitator, prevents the quality deterioration of ready-mixed concrete in a transport process, avoids the scaling-up and weight increase of a temperature adjusting device and not accompanying the unnecessary reduction of the loading amount of ready-mixed concrete. <P>SOLUTION: The water in the washing water tank C1 discharged from a pump C3 is branched as temperature adjusting water, this temperature adjusting water is applied to the drum D to adjust the temperature of the ready-mixed concrete in the drum D, the temperature adjusting water applied to the drum D is recovered and the recovered temperature adjusting water is returned to the washing water tank C1 to be circulated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a truck agitator that accommodates ready-mixed concrete manufactured in a ready-mixed concrete factory in a drum and transports it to a concrete structure construction site (hereinafter referred to as “site”). The present invention relates to a drum temperature adjusting method and a drum temperature adjusting device intended to prevent quality deterioration of ready-mixed concrete in a drum.

  Typically, ready-mixed concrete produced in a ready-mixed concrete factory is transported to the site in a state of being housed in a drum of a truck agitator. During transport, it suppresses the temperature rise of the ready-mixed concrete in the drum due to direct sunlight in summer, high outside air temperature, or heat of hydration reaction of ready-mixed concrete, and JIS (Japanese Industrial Standards), Japan Society of Civil Engineers, and Architectural Institute of Japan. It is required to deliver ready-mixed concrete manufactured at a quality within the specified range, etc. to the site while maintaining the quality at the time of manufacture. The temperature management of ready-mixed concrete in hot and cold is regulated by JIS. ing.

  The relative relationship between the temperature change of the material and the temperature change of the ready-mixed concrete is generally ± 1 ° C with respect to the temperature change of cement ± 8 ° C, water ± 4 ° C, aggregate ± 2 ° C. It is said that. Therefore, during transportation, the temperature of the ready-mixed concrete in the drum rises by several degrees as the temperature of the material increases due to direct sunlight and high outside air temperature, or due to the hydration reaction of the ready-mixed concrete itself. The temperature may be outside the range specified by JIS, etc., resulting in quality degradation.

  Therefore, in summer, a method of adjusting the temperature of ready-mixed concrete by precooling the material before manufacture of ready-made concrete has been considered. However, the specific method is based on water spraying on the coarse aggregate, and naturally, the surface water of the coarse aggregate greatly fluctuates when water spraying is performed, so that the method is not actively adopted. In addition, when a method other than watering is adopted as a method for precooling the material before production of ready-mixed concrete, the cost burden is large, and a remarkable effect commensurate with the high cost cannot be obtained. is the current situation.

  On the other hand, it is not a method of pre-cooling the material before manufacturing the ready-mixed concrete, but by suppressing the temperature rise of the drum itself, the temperature rise of the ready-mixed concrete in the drum is suppressed, and the quality deterioration of the ready-mixed concrete during transportation Truck agitators aimed at preventing this are being considered. Hereinafter, some aspects will be described.

  First, Patent Document 1 below discloses a mode in which the outer portion of the drum has a double structure in which a heat insulating material is interposed, thereby suppressing the temperature rise of the drum itself.

  Further, in Patent Document 2 below, the drum is surrounded by a heat insulation box, and cooling air is blown into a space formed between the outer surface portion of the drum and the heat insulation box, thereby suppressing the temperature rise of the drum itself. Is disclosed.

  Patent Document 3 below discloses a mode in which the temperature of the drum itself is suppressed by covering the top of the drum with a cover and spraying cooling water directly onto the drum.

Further, in Patent Document 4 below, a drum is provided by providing a pan below the drum, putting a cooling medium for cooling the lower part of the drum in the pan, and immersing the lower part of the rotating drum in the cooling medium. The aspect which suppresses the temperature rise of this is disclosed.
JP-A-9-277245 JP-A-11-277523 JP 2003-94425 A JP 2006-111150 A

  However, the aspect described in Patent Document 1 not only requires modification to the drum, but also does not actively cool or heat the drum, and thus may not be able to appropriately manage the temperature of the drum. The quality of the ready-mixed concrete in the drum may be deteriorated.

  Moreover, the aspect of the said patent document 2 and the patent document 3 requires the large sized apparatus which covers a drum, and also must equip the apparatus for supplying cooling air, and the tank for cooling water newly. Therefore, the weight of the entire apparatus for cooling the drum increases, and accordingly, there arises a problem that the loading amount of the ready-mixed concrete decreases. That is, the total vehicle weight (total weight obtained by multiplying the vehicle weight, maximum loading capacity and 55 kilograms of riding capacity) is regulated by the law (Road Transport Vehicle Law), and the large-sized device for adjusting the drum temperature As a matter of course, the weight of the vehicle increases the weight of the vehicle, and as a result, the amount of ready-mixed concrete that can be loaded on the vehicle greatly decreases. This means that the transport efficiency from the ready-mixed concrete factory to the site is deteriorated, which is a fatal problem for the truck agitator that is required to improve the transport efficiency.

  Moreover, the aspect of the said patent document 4 cannot obtain sufficient cooling effect, when the cooling medium once heat-exchanged between drums is used as it is, and cannot adjust the temperature of a drum. There is a problem that it cannot be performed precisely. On the other hand, in order to continuously obtain the cooling effect, the replacement / replenishment operation is troublesome when the mode of replacing or replenishing the cooling medium that has exchanged heat with the drum is replaced with a new cooling medium. In addition, a large amount of cooling medium is required, resulting in an increase in the weight of the entire vehicle. As a result, the amount of ready-mixed concrete that can be loaded is reduced.

  Furthermore, each aspect of said patent documents 2-4 requires the medium for exclusive use for cooling a drum, especially when special media other than water are applied as a medium, a cost burden is large, and a medium Depending on the situation, it may be necessary to dispose of the product as industrial waste.

  The present invention has been made paying attention to such a problem, and a main purpose thereof is to adjust the temperature of the drum using cleaning water stored in a tank for cleaning water already installed in the track agitator. This prevents deterioration of the quality of the ready-mixed concrete during the transportation process, avoids the increase in size and weight of the device itself for adjusting the drum temperature, and adjusts the drum temperature without unnecessarily reducing the load of ready-mixed concrete. It is to provide a method and a drum temperature adjusting device.

  That is, the method for adjusting the drum temperature of a track agitator according to the present invention comprises a drum for transporting ready-mixed concrete, a cleaning water tank for storing cleaning water, and a cleaning nozzle for cleaning water in the cleaning water tank. In a truck agitator loaded with a pump for feeding toward the water, the water in the washing water tank discharged from the pump is branched as temperature adjusting water, and the temperature adjusting water is The temperature of the ready-mixed concrete in the drum is adjusted by being engaged with the drum, the temperature adjusting water after being engaged with the drum is recovered, and the recovered temperature adjusting water is supplied to the washing water tank. It is a method characterized by returning and circulating.

  In the present invention, “fresh concrete” is a concept that broadly indicates what is transported using a truck agitator as well as narrow concrete. That is, it is a concept that includes mortar, cement paste, and the like that do not include coarse aggregate.

  In such a case, since the temperature of the drum is adjusted using the water stored in the existing washing water tank, not only a dedicated refrigerant device and refrigerant are required, but also the existing Since the temperature of the drum is adjusted using the washing water tank and the pump, the temperature of the ready-mixed concrete in the drum can be adjusted without significantly increasing the weight of the vehicle. As a result, measures were taken to adjust the temperature of the ready-mixed concrete in the drum, so that the conventional problem that the amount of ready-mixed concrete that can be loaded onto the vehicle was significantly reduced was eliminated, and the ready-mixed concrete factory moved to the site. This will not cause a decrease in transport efficiency. Further, by circulating and reusing water for temperature adjustment, it is possible to continuously obtain the effect of cooling or warming the drum, and hence the ready-mixed concrete in the drum.

  In particular, by adjusting the temperature of the temperature adjusting water to be circulated with a water temperature adjusting device such as a chiller or hot water machine, the temperature of the circulating temperature adjusting water is precisely adjusted to a temperature suitable for cooling or heating the drum. The temperature can be controlled, and the drum is actively cooled or heated with water for temperature adjustment, thereby suppressing the temperature rise or temperature drop of the drum and, therefore, the ready-mixed concrete in the drum for a long time. can do.

  The drum temperature control device for a track agitator according to the present invention comprises a drum for transporting ready-mixed concrete, a cleaning water tank for storing cleaning water, and cleaning the water in the cleaning water tank for drum cleaning. A heat exchanging means for bringing the water into direct or indirect contact with the drum in order to adjust the temperature of the ready-mixed concrete in a structure in which a pump for feeding toward the nozzle is loaded, and the heat exchange A temperature adjustment water supply system for supplying water discharged from the pump to the means as temperature adjustment water, and a recovery means for recovering the temperature adjustment water after heat exchange with the drum And a temperature adjustment water return path for returning the temperature adjustment water recovered by the recovery means to the washing water tank.

  In such a case, by using the wash water already mounted on the vehicle as the temperature adjustment water, a dedicated refrigerant device or refrigerant becomes unnecessary, and it is stored in the wash water tank. By circulating the wash water as temperature adjustment water in the order of the wash water tank, the temperature adjustment water supply system, the heat exchange means, the recovery means, the temperature adjustment water return system, and the wash water tank, As a result, the effect of cooling or warming the ready-mixed concrete in the drum can be continuously obtained. In addition, there is no need for a large-scale device such as a conventional structure in which the outer portion of the drum has a double structure with an insulating material interposed, or the drum is surrounded by a heat insulating box, or the upper portion of the drum is covered with a cover. The drum temperature can be adjusted without increasing the size and weight of the drum temperature adjusting device. As a result, loading a device for adjusting the temperature of ready-mixed concrete in the drum can avoid a situation in which the amount of ready-mixed concrete that can be loaded on the vehicle is reduced. This will not cause a decrease in transport efficiency.

  The drum temperature adjusting device further includes a water temperature adjusting device for adjusting a temperature of the temperature adjusting water circulating through the temperature adjusting water return path, the washing water tank, and the temperature adjusting water supply path. The circulating water can be precisely controlled to a temperature suitable for heat exchange with a water temperature adjusting device, and the drum is actively cooled or heated using such temperature adjusting water. As a result, it is possible to suppress an increase or decrease in the temperature of the drum over a long period of time.

  In addition, if the heat exchanging means is a heat exchanging nozzle that disperses and sprays temperature adjusting water on the outer peripheral surface of the drum, the temperature adjusting water is surely brought into contact with the drum while having a simple structure. It is possible to accurately exchange heat between the temperature-adjusting water and the drum.

  In addition, in order to easily switch between the drum cleaning operation and the drum temperature adjustment operation, the temperature adjustment water supply path shuts off the water from the pump to the cleaning nozzle by the switching operation, and the temperature is changed. A branch valve that leads to the adjustment port, and a pipe such as a pipe or a hose that guides the water discharged from the temperature adjustment port of the branch valve to the heat exchange means as temperature adjustment water. It is desirable.

  If the recovery means is provided with a recovery tray erected on the lower surface side of the drum, it is possible to efficiently recover water for temperature adjustment after heat exchange with the drum.

  In the case where the recovery means is provided with the recovery tray, the recovery means is an air jet for preventing leakage of temperature adjusting water from between the drum and the edge of the recovery tray. A drum, a blow source that sends air to the air injection nozzle, and a pipe such as a pipe or a hose that guides the air sent from the blow source to the air injection nozzle. Among the water for temperature adjustment after heat exchange between them, the water droplets that have adhered to the drum without evaporating are pushed back by the air pumped from the air injection nozzle, so that the recovery rate of the temperature adjustment water is made possible Can be enhanced.

  In addition, if the temperature adjustment water return path is provided with an auxiliary pump that biases the temperature adjustment water collected by the collection means toward the washing water tank, the downstream end of the collection means However, even when it is at a lower position than the washing water tank, the temperature adjustment water collected by the recovery means can be sent to the washing water tank by the auxiliary pump, and the circulation of the temperature adjustment water is smooth. It can be carried out.

  As a suitable arrangement | positioning aspect of the said water temperature adjustment apparatus, the aspect provided in the said water return system for temperature adjustment is mentioned.

  As described above, according to the present invention, since the temperature of the drum is adjusted using the existing tank for the cleaning water, the pump, and the cleaning water for the track agitator, the weight of the entire vehicle is greatly increased. It is possible to prevent the deterioration of the quality of the ready-mixed concrete in the drum during the transportation process without being accompanied by unnecessary reduction of the load of ready-mixed concrete. Further, by actively cooling or heating the drum using the circulating water, it is possible to suppress the temperature rise or temperature drop of the drum, and hence the ready-mixed concrete in the drum, over a long period of time.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the track agitator A according to this embodiment includes a vehicle body T, a drum D for transporting ready-mixed concrete mounted on the vehicle body T, and an input for charging ready-mixed concrete into the drum D. The hopper H is provided, and the ready-mixed concrete manufactured in the ready-mixed concrete factory is transported to the site while being accommodated in the drum D. And when it arrives at a conveyance destination (site), the fresh concrete in the drum D is discharged using the discharge chute S.

  The track agitator A is loaded with a drum cleaning device C for cleaning the inside of the drum D after the ready-mixed concrete is discharged, like the conventional track agitator. The drum cleaning device C cleans the water in the cleaning water tank C1, the cleaning nozzle C2 for cleaning the drum D, and the cleaning water tank C1, as shown in FIGS. And a pump C3 for feeding toward the nozzle C2. In this embodiment, a branch valve R21, which will be described later, is arranged between the pump C3 and the cleaning nozzle C2, and the cleaning water sent from the pump C3 is discharged from the cleaning port R212 of the branch valve R21 and guided to the cleaning nozzle C2. I am doing so. Further, as shown in FIGS. 3 and 4, there is a pipe or a space between the cleaning water tank C1 and the pump C3, between the pump C3 and the branch valve R21, and between the branch valve R21 and the cleaning nozzle C2. A first pipe P1, a second pipe P2, and a third pipe P3 such as a hose are provided.

  Since the drum D, the charging hopper H, the discharge chute S, the cleaning water tank C1, the cleaning nozzle C2, and the pump C3 are known, detailed description of each part is omitted.

  Therefore, the track agitator A according to this embodiment includes a drum temperature adjusting device R for adjusting the temperature of the drum D in order to adjust the temperature of the ready-mixed concrete in the drum D.

  As shown in FIGS. 1 to 4, the drum temperature adjusting device R includes a washing water tank C1, a pump C3, a heat exchange nozzle R1 serving as a heat exchange means for bringing water into direct contact with the drum D, Water for temperature adjustment after heat exchange between the temperature adjustment water supply system R2 for supplying water discharged from the pump C3 to the heat exchange nozzle R1 as water for temperature adjustment and the drum D A recovery means R3 for recovery and a temperature adjustment water return path R4 for returning the temperature adjustment water recovered by the recovery means R3 to the washing water tank C1 are provided.

  The washing water tank C1 and the pump C3 are already installed in the track agitator A as described above. In this embodiment, the washing water tank C1 and the pump C3 constituting a part of the drum washing apparatus C are replaced with the drum temperature. It functions as a part of the adjusting device R.

  The heat exchange nozzle R1 includes a substantially cylindrical heat exchange nozzle body R11 extending along the longitudinal direction of the drum D, and injection ports R12 intermittently arranged at a predetermined pitch along the longitudinal direction of the heat exchange nozzle body R11. And water for temperature adjustment is dispersed and sprayed on the outer peripheral surface of the drum D.

  The temperature adjustment water supply path R2 is configured to switch the water sent from the pump C3 to the temperature adjustment port R211 by blocking the water from the pump C3 to the cleaning nozzle C2 by switching operation, and the branch valve R21. It includes a fourth pipe P4 such as a pipe or a hose that guides water discharged from the temperature adjustment port R211 to the heat exchange nozzle R1 as temperature adjustment water.

  The branch valve R21 includes a temperature adjustment port R211 and a washing port R212, and a first valve open state for leading water sent from the pump C3 to the temperature adjustment port R211 by electric or manual operation, and for washing It can be switched between the second valve open state led to the port R212. The branch valve R21 positively functions as part of the temperature adjustment water supply path R2 when in the first valve open state.

  The recovery means R3 is an air injection nozzle for preventing the temperature adjusting water from leaking between the recovery tray R31 erected on the lower surface side of the drum D and the edge R31a of the recovery tray R31 and the drum D. R32.

  The collection tray R31 includes a generally bowl-shaped tray body R311 that opens upward and can cover the lower surface side of the drum D, and a discharge port R312 provided at the bottom of the tray body R311.

  The saucer body R311 is configured by a sloped wall portion set so that the boundary with the discharge port R312 is at the lowest position. In the present embodiment, the vicinity of the edge R31a of the tray main body R311 is an upright portion that is erected in a substantially vertical direction, and water for temperature adjustment collected in the collection tray R31 leaks from the edge R31a of the collection tray R31. To prevent that.

  The discharge port R312 has a substantially funnel shape in which the opening width is gradually reduced toward the lower end.

  The air injection nozzle R32 is connected to a blower source R32A such as a blower via an eighth pipe P8 such as a pipe or a hose, and has a substantially cylindrical air injection nozzle body R321 extending along the longitudinal direction of the drum D, and an air An air injection port R322 intermittently arranged at a predetermined pitch along the longitudinal direction of the injection nozzle body R321 is provided, and air is dispersed and sprayed onto the outer peripheral surface of the drum D. In this embodiment, as shown in FIGS. 2 and 3, the air injection nozzle R32 and the heat exchange nozzle R1 are arranged at positions substantially opposite to each other across the drum D. Specifically, when the drum D rotates in the forward direction (the arrow X direction shown in FIG. 3), the heat exchange nozzle R1 faces the same surface of the drum D before the air injection nozzle R32. The relative positional relationship between the heat exchange nozzle R1 and the air injection nozzle R32 is set so as to be obtained. Thereby, the water for temperature adjustment sprayed on the outer surface portion of the drum D by the heat exchange nozzle R1 is pushed back by the air injection nozzle R32 and collected in the collection tray R31. In the present embodiment, as shown in FIG. 3, the heat exchange nozzle R1 is arranged in the vicinity of the edge R31a on the other side of the tray body R311 and the air injection nozzle R32 is arranged on the edge on one side of the tray body R311. Arranged in the vicinity of R31a. In particular, in the present embodiment, the air injection nozzle R32 is arranged slightly above the edge R31a of the tray body R311. On the other hand, the heat exchange nozzle R1 is arranged between the edge R31a of the tray body R311 and the drum D. The air injection nozzle R32 and the heat exchange nozzle R1 are fixed by appropriate means at positions separated from the outer surface of the drum D by approximately 10 cm.

  The temperature adjustment water return path R4 for returning the temperature adjustment water collected by the recovery means R3 to the washing water tank C1 is an auxiliary for energizing the collected temperature adjustment water in the direction of the washing water tank C1. A pump R41 is provided. The auxiliary pump R41 has a delivery capacity equal to or higher than that of the pump C3 and can be driven by an automobile power source.

  Furthermore, the drum temperature adjusting device R according to the present embodiment includes a temperature adjusting water circulating through the temperature adjusting water return path R4, the washing water tank C1, and the temperature adjusting water supply path R2. A water temperature adjusting device R5 for adjusting the temperature is provided.

  The water temperature adjusting device R5 forcibly adjusts the temperature of the temperature adjusting water collected by the collecting means R3 within a predetermined numerical value. In the present embodiment, a chiller is applied as the water temperature adjusting device R5. This water temperature adjusting device R5 can be driven by an automobile power supply, and is set to cool the temperature adjusting water collected by the collecting means R3 to about 1 to 5 ° C.

  In the drum temperature adjusting device R according to the present embodiment, such a water temperature adjusting device R5 is provided in the temperature adjusting water return path R4. Specifically, this water temperature adjusting device R5 is arranged on the downstream side of the auxiliary pump R41. Further, as shown in FIGS. 3 and 4, between the discharge port R312 of the collection tray R31 and the auxiliary pump R41, between the auxiliary pump R41 and the water temperature adjusting device R5, and between the water temperature adjusting device R5 and the washing water tank. A fifth pipe P5, a sixth pipe P6, and a seventh pipe P7 such as a pipe or a hose are arranged between the pipe C1 and the pipe C1, respectively. Therefore, the temperature adjusting water collected by the collecting means R3 is guided in the order of the fifth pipe P5, the auxiliary pump R41, the sixth pipe P6, the water temperature adjusting device R5, and the seventh pipe P7, and is used for washing water. Return to tank C1. That is, the temperature adjustment water return path R4 in the present embodiment is configured by the fifth pipe P5, the auxiliary pump R41, the sixth pipe P6, the water temperature adjusting device R5, and the seventh pipe P7.

  Next, the operation of the drum temperature adjusting device R having such a configuration will be described along the temperature adjusting water circulation path.

  When transporting ready-mixed concrete manufactured in a ready-mixed concrete plant to the site while being accommodated in the drum D, the drum D is rotated forward in order to agitate the ready-mixed concrete in the drum D, and the branch valve R21 is connected to the first valve. 2. The valve opening state (state in which water sent from the pump C3 is led to the cleaning port R212) is switched to the first valve opening state (state in which water sent from the pump C3 is led to the temperature adjustment port R211).

  In this state, by driving the pump C3, the water in the cleaning water tank C1 moves the first pipe P1, the pump C3, the second pipe P2, the branch valve R21, and the fourth pipe P4 in this order. Pass by. The water for temperature adjustment that is sent to the branch valve R21 through the second pipe P2 by the pump C3 is guided to the temperature adjustment port R211 of the branch valve R21, and the heat exchange nozzle R1 by the fourth pipe P4. Be guided to.

  The water for temperature adjustment guided to the heat exchange nozzle R1 is dispersed from each injection port R12 and sprayed evenly on the lower surface side of the outer peripheral surface of the drum D. As a result, water for temperature adjustment is sequentially sprayed over the entire outer peripheral surface of the positively rotating drum D, and the temperature rise of the drum D itself is suppressed and cooled.

  The temperature adjusting water sprayed on the outer peripheral surface of the drum D is recovered by the recovery means R3, and then returned to the washing water tank C1 by the temperature adjusting water return path R4. More specifically, of the temperature adjustment water sprayed on the outer peripheral surface of the drum D, the water that has not evaporated drops down and is collected by the collection tray R31. Further, the water adhering to the outer peripheral surface of the drum D without dripping is blown off by the air fed from the air injection nozzle R32 to the outer peripheral surface of the drum D and recovered in the recovery tray R31. At this time, blowing air from the air injection nozzle R32 to the outer peripheral surface of the drum D itself contributes to cooling of the outer peripheral surface of the drum D. That is, the air injection nozzle R32 also functions as a cooling unit that suppresses the temperature rise of the drum D and eventually the ready-mixed concrete in the drum D.

  The water for temperature adjustment collected in the collection tray R31 is led from the discharge port R312 of the collection tray R31 to the auxiliary pump R41 through the fifth pipe P5, and subsequently to the washing water tank C1 by the auxiliary pump R41. Sent out.

  The temperature adjusting water sprayed on the outer peripheral surface of the drum D and later recovered in the recovery tray R31 has a higher temperature than before spraying due to heat exchange with the drum D. Therefore, in the present embodiment, in the process of sending such temperature adjusting water toward the washing water tank C1 by the auxiliary pump R41, the water temperature adjusting device R5 is connected by the sixth pipe P6 connected to the auxiliary pump R41. Then, it is cooled to a predetermined temperature (about 1 to 5 ° C. in this embodiment) by the water temperature adjusting device R5. The water cooled by the water temperature adjusting device R5 is guided to the washing water tank C1 through the seventh pipe P7. Thus, the water guided to the washing water tank C1 is again supplied to the washing water tank C1, the temperature adjustment water supply system R2, the heat exchange nozzle R1, the recovery means R3, and the temperature adjustment water return system R4. Then, the water is circulated in the order of the washing water tank C1 and heat exchange with the drum D is performed. As a result, the temperature rise of the drum D itself is suppressed, and quality deterioration due to the temperature rise of the ready-mixed concrete in the drum D can be avoided.

  As described above, the drum temperature adjusting method for the track agitator A according to the present embodiment branches the water in the cleaning water tank C1 discharged from the existing pump C3 as water for temperature adjustment, The temperature of the ready-mixed concrete in the drum D is adjusted by bringing the water into contact with the drum D, the water for adjusting the temperature after being brought into contact with the drum D is recovered, and the recovered temperature adjusting water is used for washing water. Since the water is returned to the tank C1 and circulated, the use of the water in the washing water tank C1 normally loaded on the track agitator A eliminates the need for a dedicated refrigerant. The temperature of the ready-mixed concrete in the drum D can be adjusted using the washing water tank C1 and the pump C2 that are normally loaded. This avoids a significant increase in the weight of the vehicle, avoids a significant decrease in the amount of ready-mixed concrete that can be loaded on the vehicle, and reduces the transport efficiency from the ready-mixed concrete plant to the site. Do not invite. Furthermore, a sufficient cooling effect can be continuously obtained by circulating and reusing water for temperature adjustment.

  In particular, since the temperature of the water for adjusting the temperature to be circulated is adjusted by the water temperature adjusting device R5, the temperature of the circulated water can be precisely managed to a temperature suitable for cooling the drum D. By positively cooling the drum D using water for temperature adjustment, the cooling effect can be maintained and maintained over a long period of time.

  In addition, the drum temperature adjusting device R of the track agitator A according to this embodiment includes a heat exchange nozzle R1 for directly bringing water into contact with the drum D and a heat exchange nozzle R1 for adjusting the temperature of the ready-mixed concrete. Recovery means for recovering water for temperature adjustment after heat exchange between the temperature adjustment water supply system R2 for supplying water discharged from the existing pump C3 as temperature adjustment water and the drum D R3 and the temperature adjustment water return path R4 for returning the temperature adjustment water recovered by the recovery means R3 to the washing water tank C1 are provided. It is not a drum temperature adjustment device with a significant weight increase such as a double structure with a heat insulating material interposed, or a drum D surrounded by a heat insulating box, or an upper portion of the drum D covered with a cover. Lightweight It is possible to realize the ram temperature regulator R. Thereby, the situation that the quantity of the ready-mixed concrete which can be loaded on the vehicle main body T can be avoided, and it contributes to the improvement of the conveyance efficiency from a ready-mixed concrete factory to the spot.

  In addition, the wash water stored in the wash water tank C1 is used as temperature adjustment water, and the wash water tank C1, the temperature adjustment water supply system R2, the heat exchange nozzle R1, the recovery means R3, the temperature adjustment A sufficient cooling effect or heating effect can be continuously obtained by circulating the water return path R4 and the washing water tank C1 in this order.

  As described above, the drum temperature adjusting device R according to the present embodiment adjusts the temperature of the drum D by using the cleaning water normally loaded on the track agitator A, and prevents the quality deterioration of the ready-mixed concrete during the transportation process. At the same time, the increase in weight can be suppressed as much as possible, and the load of ready-mixed concrete is not reduced, which makes it practical.

  Further, the drum temperature adjusting device R according to the present embodiment adjusts the temperature of the temperature adjusting water circulating through the temperature adjusting water return path R4, the washing water tank C1, and the temperature adjusting water supply path R2. The water temperature adjusting device R5 is provided, and the temperature adjusting water whose temperature has been increased by performing heat exchange with the drum D is set to a predetermined temperature suitable for heat exchange by the water temperature adjusting device R5. The temperature of the temperature adjustment water can be precisely controlled to a temperature suitable for heat exchange. By actively cooling the drum D using such temperature adjustment water, the transportation time is long. Even if it exists, a cooling effect is fully exhibited and quality deterioration of ready-mixed concrete can be prevented.

  Further, in the present embodiment, as a heat exchanging means for bringing water into direct contact with the drum D in order to adjust the temperature of the ready-mixed concrete, a heat exchanging nozzle that disperses and sprays water for adjusting the temperature on the outer peripheral surface of the drum D. Since R1 is applied, the heat exchanging means can be realized with a simple structure, and the rotating drum is compared with a mode in which the lower part of the drum is immersed in a refrigerant in a pan provided on the lower surface side of the drum. Water for temperature adjustment before performing heat exchange can always be brought into contact with D, and the cooling effect becomes even more remarkable.

  Further, the temperature adjustment water supply system R2 is connected to the branch valve R21 that shuts off the water from the pump C3 to the cleaning nozzle C2 by the switching operation and leads to the temperature adjustment port R211, and the temperature adjustment port R211 of the branch valve R21. Since the discharged water is provided with a fourth pipe P4 that guides the discharged water as temperature adjustment water to the heat exchange nozzle R1, it is stored in the washing water tank C1 only by the switching operation to the branch valve R21. One of the cases where the water used as cleaning water or the temperature adjusting water is used can be selected, and the drum cleaning operation and the drum temperature adjustment operation can be easily switched.

  In addition, since the recovery means R3 is provided with a recovery tray R31 provided on the lower surface side of the drum D, water for temperature adjustment after heat exchange with the drum D is efficiently recovered. can do.

  In particular, since the collecting means R3 further includes an air injection nozzle R32 for preventing leakage of temperature adjusting water from between the drum D and the edge R31a of the collecting tray R31, the drum D Of the water for temperature adjustment after heat exchange with the water is carried out by pushing back the water droplets adhering to the drum D without evaporating by the air fed from the air injection nozzle R32. The rate can be increased as much as possible. Moreover, the drum D can be cooled by pumping air to the outer peripheral surface of the drum D by the air injection nozzle R32, and the cooling effect increases in combination with the water temperature adjusting device R5 and the heat exchange nozzle R1. . This means that even if the ability of the water temperature adjustment device R5 is low, the air injection nozzle R32 complements it and exhibits a sufficient cooling effect. For example, the water temperature adjustment is relatively compact and lightweight. The range of choice of water temperature adjustment equipment is widened, such as the ability to use equipment, and the design flexibility is great.

  Furthermore, since the temperature adjustment water return path R4 includes an auxiliary pump R41 that urges the temperature adjustment water collected by the collection means R3 toward the wash water tank C1, Even when the downstream end is at a lower position than the washing water tank C1, the auxiliary pump R41 can accurately send the temperature adjustment water collected by the collecting means R3 to the washing water tank C1. The temperature adjustment water can be circulated smoothly and accurately.

  In addition, since the water temperature adjusting device R5 is provided in the temperature adjusting water return path R4, the water temperature adjusting device R5 has a predetermined temperature in the water temperature adjusting device R5 before returning the temperature adjusting water collected by the collecting means R3 to the washing water tank C1. By cooling to the temperature, the entire water in the washing water tank C1 can be brought to a temperature suitable for adjusting the temperature of the drum D.

  The present invention is not limited to the embodiment described in detail above.

  For example, instead of the nozzle type that injects the temperature adjustment water, a type that drops the temperature adjustment water may be applied as the heat exchange means. In addition, the heat exchange means may bring temperature adjusting water into contact with the outer peripheral surface of the drum from above or below the drum. Moreover, although the aspect which arranged the heat exchange nozzle substantially horizontally was illustrated in FIG. 1, not only this but the aspect which arranged the heat exchange nozzle in the state inclined gradually downward from the upstream toward the downstream May be adopted. In this way, it is possible to ensure a smooth flow of temperature adjusting water.

  Furthermore, as the heat exchange means, a sheet-like heat exchanger that covers the outer surface of the drum and can exhibit a cooling action or a heating action may be employed.

  Further, the recovery means may be provided with a scraper such as a brush or rubber that can contact the outer peripheral surface of the drum, instead of the air injection nozzle.

  In addition, when the downstream end of the recovery means is located higher than the washing water tank, the temperature adjustment water return path applies the temperature adjustment water collected by the recovery means toward the washing water. It is not necessary to have an auxiliary pump to power. Similarly, in the case where the temperature adjustment water circulates in a closed loop circulation path, a temperature adjustment water return path that does not have an auxiliary pump may be applied.

  Further, when used in winter or when used in a cold region, a water heater may be applied as a water temperature adjusting device. In this case, if the air injection nozzle of the recovery means pumps warm air to the outer peripheral surface of the drum, the air injection nozzle functions as a heating means that suppresses the temperature drop of the drum and eventually the ready-mixed concrete in the drum. .

  In addition, the drum cleaning operation and the drum temperature can be performed by selectively connecting either the pipe connected to the cleaning nozzle or the pipe connected to the heat exchange means to the discharge port of the pump without using a branch valve. You may employ | adopt the aspect which enables switching with adjustment work, or the aspect which connects the pipe line connected to the heat exchange means to the front-end | tip of a washing nozzle at the time of temperature adjustment work.

  Further, the water temperature adjusting device may be arranged at a place other than the temperature adjusting water return path.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

The figure which abbreviate | omits a part of side surface of the track agitator which concerns on one Embodiment of this invention, and shows typically. The figure which shows typically the whole schematic diagram of the drum temperature control apparatus which concerns on the same embodiment. The figure which shows typically the layout of the drum temperature control apparatus which concerns on the same embodiment. The figure which shows typically the circulation path of the water for temperature control in the drum temperature control apparatus which concerns on the same embodiment.

Explanation of symbols

A ... Truck agitator C1 ... Wash water tank C2 ... Wash nozzle C3 ... Pump D ... Drum P4 ... Pipe line (fourth pipe line)
R ... Drum temperature adjusting device R1 ... Heat exchange means (heat exchange nozzle)
R2 ... Temperature adjustment water supply path R21 ... Branch valve R211 ... Temperature adjustment port R3 ... Recovery means R31 ... Recovery tray R32 ... Air injection nozzle R32A ... Air source R32B ... Pipe line (eighth pipe)
R4 ... Water return path for temperature adjustment R41 ... Auxiliary pump R5 ... Water temperature adjustment equipment

Claims (10)

It is equipped with a drum for transporting ready-mixed concrete and is loaded with a washing water tank for storing washing water and a pump for sending water in the washing water tank toward a washing nozzle for drum washing A drum temperature adjustment method for a track agitator,
Branching water in the washing water tank discharged from the pump as temperature adjustment water, and adjusting the temperature of the ready-mixed concrete in the drum by engaging the temperature adjustment water with the drum; The drum temperature of the truck agitator for transporting ready-mixed concrete, wherein the temperature adjusting water after being engaged with the drum is recovered, and the recovered temperature adjusting water is returned to the washing water tank and circulated. Adjustment method. The method for adjusting the drum temperature of a truck agitator for transporting fresh concrete according to claim 1, wherein the temperature of the water for temperature adjustment to be circulated is adjusted by a water temperature adjusting device such as a cold water heater or a hot water heater. It is equipped with a drum for transporting ready-mixed concrete and is loaded with a washing water tank for storing washing water and a pump for sending water in the washing water tank toward a washing nozzle for drum washing A drum temperature control device for a track agitator,
In order to adjust the temperature of the ready-mixed concrete, heat exchange means for bringing the water into direct or indirect contact with the drum, and water discharged from the pump is supplied to the heat exchange means as temperature adjustment water. A temperature adjusting water supply system and a recovery means for recovering the temperature adjusting water after heat exchange between the drum and the temperature adjusting water recovered by the recovery means for the washing water A drum temperature adjusting device for a truck agitator for transporting ready-mixed concrete, comprising a water return system for temperature adjustment for returning to a tank. The raw temperature adjustment apparatus which adjusts the temperature of the water for temperature adjustment which circulates through the said water return path for temperature adjustment, the said tank for washing water, and the said water supply path for temperature adjustment. Drum temperature control device for truck agitator for transporting concrete. The drum temperature adjusting device for a truck agitator for transporting fresh concrete according to claim 3 or 4, wherein the heat exchanging means is a heat exchanging nozzle that disperses and sprays water for adjusting the temperature on the outer peripheral surface of the drum. The temperature adjustment water supply system uses a switching operation to block water from the pump to the washing nozzle and lead to the temperature adjustment port, and temperature adjustment of water discharged from the temperature adjustment port of the branch valve 6. The drum temperature adjusting apparatus for a truck agitator for transporting ready-mixed concrete according to claim 3, comprising pipes such as pipes and hoses that guide the heat exchange means as water for use. 7. A drum temperature adjusting device for a truck agitator for transporting ready-mixed concrete according to claim 3, wherein the recovery means includes a recovery tray that is provided on the lower surface side of the drum. An air injection nozzle for preventing the temperature adjusting water from leaking from between the drum and the edge of the recovery tray, a blowing source for sending air to the air injection nozzle, and 8. The drum temperature adjusting device for a truck agitator for transporting ready-mixed concrete according to claim 7, further comprising a pipe line such as a pipe or a hose for guiding air sent from a blow source to the air injection nozzle. The temperature adjustment water return path includes an auxiliary pump that biases the temperature adjustment water collected by the collection means toward the washing water tank. The drum temperature adjusting device for a truck agitator for transporting ready-mixed concrete according to 7 or 8. The drum temperature adjusting apparatus for a truck agitator for transporting ready-mixed concrete according to claim 4, 5, 6, 7, 8, or 9, wherein the water temperature adjusting device is provided in the temperature adjusting water return path.

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