JP2006240376A - Drum cleaning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drum cleaning device capable of performing optimum drum cleaning irrespective of charging amount of cleaning water. <P>SOLUTION: The drum cleaning device is equipped with the drum D rotatably mounted to a stand of a mixer vehicle, having a spiral blade 21 in the inner peripheral side, and drive means 1, 2 driving to rotate the drum D to clean the inside of the drum D by charging, discharging, and rotating the drum D alternately. The discharge rotation amount of the drum is controlled based on the charging amount of the cleaning water charged into the drum D. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drum cleaning device for a mixer truck, and more particularly to a drum cleaning device for automatically cleaning the inside of a drum of a mixer truck.

  In an agitator truck called a mixer truck, if mortar or ready-mixed concrete (hereinafter referred to as “green concrete”), which is a transported material, remains in the drum mounted on the chassis, the agitation performance deteriorates in the worst case. It becomes a cause of various adverse effects such as difficulty in charging and discharging the raw food from the drum.

  Therefore, for the maintenance of the mixer truck, it is preferable to clean the inside of the drum promptly after discharging the live concrete. Traditionally, for example, about one-fifth of the maximum load capacity in the drum in order to perform the drum cleaning. The cleaning water is added, and then the drum is alternately charged and discharged. The operator determines the drum rotation speed (number of rotations per unit time), rotation direction and cleaning time based on experience. However, since all the operations were performed manually, there was a problem that the burden on the operator was great and the cleaning results were uneven.

Therefore, in recent years, in order to simplify the drum cleaning operation, a plurality of drum rotation patterns that determine the drum rotation speed, rotation direction, and cleaning time during drum cleaning are prepared in advance corresponding to the slump value of the live controller. A drum cleaning device has been proposed in which one of a plurality of drum rotation patterns is selected based on the slump value to control a hydraulic motor and a hydraulic pump. Since the drum cleaning operation can be performed automatically only by pressing the switch, the work load on the operator is greatly reduced, and the cleaning result can be stabilized (for example, see Patent Document 1).
JP 2002-67782 A (pages 5 to 12, FIGS. 3 and 8)

  However, since the rotation control of the drum is performed based only on the slump value in accordance with the conventional drum cleaning device, it may be pointed out that there are the following problems.

  That is, in order to wash the drum, it is necessary to throw the washing water into the drum as described above, as long as the amount of washing water is charged in accordance with the standard of the drum washing device, If the amount of cleaning water is too small, the cleaning water may not reach the blade or the drum inner wall in the vicinity of the drum inlet during cleaning and during drum discharge rotation.

  In other words, the degree of cleaning of the drum varies depending on the amount of cleaning water input, and particularly when the level of cleaning is poor, the adherence of the ready-mixed material to the drum inner wall and blade surface advances, leading to a decrease in drum loading and discharge. It may cause problems such as performance degradation.

  On the other hand, if the amount of cleaning water is too large, there is a risk that cleaning water containing raw concrete may leak from the drum during cleaning and during drum discharge rotation.

  Therefore, the present invention was devised to improve the above-described problems, and an object of the present invention is to provide a drum cleaning device that can perform optimal drum cleaning regardless of the amount of cleaning water input. That is.

  In order to achieve the above-mentioned object, a first problem solving means of the present invention comprises a drum that is rotatably mounted on a pedestal of a mixer car and has a spiral blade on the inner peripheral side, and rotationally drives the drum. In a drum cleaning apparatus that includes a driving unit and alternately rotates the discharge of drums to clean the inside of the drum, the discharge rotation amount of the drum is controlled based on the input amount of cleaning water that is input into the drum. To do.

  The second problem-solving means includes a drum that is rotatably mounted on the frame of the mixer car and has a spiral blade on the inner peripheral side, and a driving means that rotationally drives the drum. In a drum cleaning apparatus for cleaning the inside of a drum by discharging and rotating, the discharge rotation time of the drum is controlled based on the amount of cleaning water charged into the drum.

  Furthermore, the third means for solving the problem includes a drum that is rotatably mounted on the frame of the mixer car and has a spiral blade on the inner peripheral side, and a driving means that rotationally drives the drum. In a drum cleaning apparatus for cleaning the inside of a drum by discharging and rotating, the discharging rotation time and discharging rotation speed of the drum are controlled based on the amount of cleaning water charged into the drum.

  According to the present invention, it is possible to prevent the cleaning water containing raw concrete from leaking from the drum during rotation of the drum during cleaning regardless of the amount of cleaning water, and the opening of the drum during rotation of the drum regardless of the amount of cleaning water. The cleaning water can reach the blade and the drum inner wall near the inlet, which is the end, and can be reliably cleaned up to the vicinity of the drum inlet.

  Further, the quality of cleaning can be improved without causing variations in the degree of cleaning of the drum depending on the amount of cleaning water introduced. Further, since the cleaning quality can be improved, there is no problem that the raw concrete adheres to the drum inner wall and the blade surface, and it is possible to prevent a decrease in the drum loading amount and a deterioration in the discharge performance.

  From the above, in this drum cleaning apparatus, optimum drum cleaning can be performed regardless of the amount of cleaning water input.

  Furthermore, since the operator is released from operations such as checking the cleaning status one by one and rotating the drum, it is possible to drastically reduce the operator's burden on the cleaning operation.

  Further, since the amount of sticking and sticking of the ready-mixed drum to the drum can be reduced, the number of chipping operations of the drum inner surface and the blade can be reduced.

  The present invention will be described below based on the illustrated embodiment. FIG. 1 is a conceptual diagram of a drum cleaning device according to an embodiment. FIG. 2 is a longitudinal sectional view of a drum according to one embodiment. FIG. 3 is a flowchart showing a cleaning procedure of the drum cleaning device according to the embodiment. FIG. 4 is a diagram showing the relationship between the amount of washing water and the allowable amount of rotation. FIG. 5 is a diagram showing the relationship between the amount of washing water and the allowable discharge rotation time. FIG. 6 is a conceptual diagram of a drum cleaning device in a modification of the embodiment.

  As shown in FIG. 1, a drum cleaning apparatus according to an embodiment includes a hydraulic motor 1 that is a driving unit that rotationally drives a drum D, a hydraulic pump 2 that supplies hydraulic pressure to the hydraulic motor 1, and a hydraulic pressure A controller 5 that controls the motor 1 and the hydraulic pump 2 and an operation device 4 that is connected to the controller 5 and can input a cleaning command to the controller 5 are configured.

  The hydraulic pump 2 is connected to an engine (not shown) of the mixer vehicle via a PTO (Power Take Off), and the rotational motion of the crankshaft of the engine is transmitted and driven to rotate.

  The hydraulic pump 2 is specifically configured as an axial bidirectional pump that changes the discharge direction and the discharge amount by changing the inclination angle of a swash plate cam (not shown). The hydraulic motor 1 connected to the pressure pump 2 via a loop-shaped pipe line 14 can be rotated forward and backward, respectively.

  The inclination cam of the hydraulic pump 2 is changed by, for example, a servo cylinder. The discharge direction and the discharge amount of the hydraulic pump 2 are detected by the capacity detection sensor 6 and input to the controller 5. Thus, the controller 5 can control the discharge direction and the discharge amount of the hydraulic pump 2 by driving the servo cylinder by using the capacity detected by the capacity detection sensor 6 as feedback.

  In addition, the hydraulic motor 1 is specifically set so that the rotation speed is changed by changing the tilt angle, and the rotation speed sensor 7 detects the rotation direction and the rotation speed. 5 is configured to control the rotation direction and rotation speed of the hydraulic motor 1 by adjusting the tilt angle by using the rotation direction and rotation speed detected by the rotation speed sensor 7 as feedback.

  The rotational speed and direction of the hydraulic motor 1 may be controlled by using the discharge direction and discharge capacity of the hydraulic pump 2 and the tilt angle of the hydraulic motor 1 as feedback.

  As shown in FIG. 2, the drum D includes a bottomed cylindrical drum shell 20, a spiral blade 21 whose outer peripheral side is fixed to the inner peripheral surface of the drum shell 20, and an open end in the drum shell 20. And a seal pipe 22 fixed to the inner peripheral side of the blade 21 on the side and disposed on the shaft core portion of the drum shell 20, and the cleaning water is introduced into the drum shell 20 through the drum shell 20. Is done.

  Further, the bottom portion of the drum shell 20 is connected to the hydraulic motor 1 via a rotary shaft (not shown) via a speed reducer (not shown), and the drum D is rotationally driven by the hydraulic motor 1.

  In turn, as shown in FIG. 2, the operating device 4 includes a cleaning switch 4a for cleaning the drum D, a volume type switch 4b for inputting the amount of cleaning water to be put into the drum D, and an operator switch. A display unit 4c for displaying the amount of cleaning water input by the 4b operation is provided, and communication with the controller 5 is enabled by being connected to the controller 5 through the signal line 11.

  In this case, the operator can set the cleaning water amount by twisting and operating the volume type switch 4b. However, the switch 4b may be another input switch such as a numeric keypad.

  The communication between the controller device 4 and the controller 5 may be performed wirelessly without using the signal line 11.

  Further, the above-described cleaning switch 4a is specifically set to a push switch type, for example. By pressing this, the cleaning command signal U and the cleaning water amount signal V input by the switch 4b are sent to the controller 5. It is set to send.

  The controller 5 receives signals output from the capacity detection sensor 6 and the rotation speed sensor 7, a cleaning command signal U, and a cleaning water amount signal V, and currents necessary for driving the hydraulic motor 1 and the hydraulic pump 2. Alternatively, as long as it can output a voltage, for example, although not shown as hardware, an amplifier for amplifying each signal, a converter for converting an analog signal into a digital signal, and a CPU (Central Processing) Unit) and a storage device such as ROM (Read Only Memory), and the calculation processing procedure and control signal output procedure necessary for driving the hydraulic motor 1 and the hydraulic pump 2 are stored in the ROM as a program. Or as a well-known computer system that is stored in advance in another storage device. It is.

  Specifically, the controller 5 controls the solenoid of a solenoid valve that can supply hydraulic pressure to a servo cylinder that adjusts the tilt angle of the hydraulic motor 1 and the tilt cam of the hydraulic pump 2 (not shown). A control voltage or a control current is output to drive and control the hydraulic motor 1 and the hydraulic pump 2.

  In this case, the rotation amount and the rotation speed of the drum D are obtained from the rotation time, the rotation speed of the hydraulic motor 1 detected by the rotation speed sensor 7, and the reduction ratio of the reduction gear.

  And the drum washing apparatus comprised as mentioned above is controlled according to the control procedure shown in FIG. This control procedure is stored in advance in the storage device of the controller 5 as described above.

  Hereinafter, the control procedure will be described. First, a cleaning command signal U is transmitted to the controller 5 by pressing the cleaning switch 4a of the operating device 4, whereby the following control procedure related to cleaning is executed.

  In step F1, it is determined whether or not the rotation direction of the drum D is the discharge rotation direction. Specifically, the controller 5 grasps the rotation direction of the drum D from the signal input from the rotation speed sensor 7 to determine whether the drum D is stopped, charged or discharged.

  If it is determined that the drum D is rotating, the control process is terminated without cleaning. On the other hand, when the drum D is rotated or stopped, the process proceeds to step F2.

  Incidentally, in the present embodiment, the rotation direction of the drum D is detected by the rotation speed sensor 7, but instead of this, the capacity detection sensor 6 for detecting the discharge direction of the hydraulic pump 2 detects the drum D. It may be determined whether or not the drum D is discharging and rotating by estimating the rotation direction.

  Accordingly, when the drum D is rotating and discharging, even if the cleaning switch 4a provided in the operation device 4 is pressed by the operator and the cleaning command signal U is input to the controller 5, the drum 10 is rotating and discharging. The cleaning operation is not performed, that is, the cleaning operation is not performed without performing the preparatory operation for supplying the cleaning water into the drum D. Therefore, the operator does not perform the cleaning operation and is necessary for the cleaning. You can be informed that you are not ready.

  Subsequently, in Step F2, the controller 5 determines whether or not the amount of cleaning water has reached the amount necessary for cleaning from the cleaning water amount signal V input into the drum D.

  If the amount of cleaning water charged into the drum D is less than the amount necessary for cleaning, the process proceeds to step F3, and the controller 5 does not perform cleaning, but calculates the amount of cleaning water input from the required amount of cleaning water. By subtracting and calculating the amount of insufficient cleaning water, for example, the display unit 4c that displays the amount of cleaning water of the operating device 4 blinks and displays the amount of insufficient cleaning water to prompt the operator to add additional cleaning water.

  In other words, when the amount of cleaning water is not sufficient, the cleaning quality of the drum D is deteriorated, so that the problem that the cleaning is completed as it is and that the operator has recognized that the cleaning has been completed is solved. This can improve the cleaning quality.

  On the other hand, when the amount of the supplied cleaning water has reached the required amount of cleaning water, the process proceeds to step F4.

  Further, in step F4, the controller 5 calculates the rotation amount that the drum D can allow on the discharge side from the amount of washing water introduced into the drum D. Here, the allowable amount of rotation is specifically, for example, as shown in FIG. 2, when the drum D is first charged and rotated, the surface W of the cleaning water indicated by the two-dot chain line feeds the cleaning water into the back of the drum shell 20. When the water is discharged and rotated from the state of the water surface W1 indicated by the long broken line, the rotation amount is such that the washing water does not spill from the opening end of the drum shell 20, and the controller 5 determines the allowable rotation amount as the controller. 4 is obtained by performing map calculation with reference to a map showing the relationship between the amount of washing water and the allowable rotation amount shown in FIG.

  The map showing the relationship between the cleaning water amount and the permissible rotation amount is the rotation amount by which the cleaning water is actually spilled from the drum D by measuring the amount of rotation that the cleaning water spills from the drum D by rotating and discharging the cleaning water into the drum D. It can be created by reducing the arbitrary amount to an allowable rotation amount, but it may be created by analyzing the shape dimensions of the drum shell 20 and the blade 21.

  In addition, if the value of the arbitrary amount that determines the allowable rotation amount is too small, the mixer vehicle may be stopped on a horizontal road surface. However, particularly when the washing starts on the downward slope, the drum D becomes horizontal. Therefore, the cleaning water may be spilled out, so that it is preferable to set the value in consideration of this.

  Here, when an angle meter is installed in the mixer vehicle and an inclination input device is provided in the operation device 4 so that the operator can input the inclination of the front and rear of the mixer vehicle, a map calculation is performed according to this inclination. The permissible rotation amount may be corrected, and a plurality of maps showing the relationship between the cleaning water amount and the permissible amount corresponding to, for example, an inclination every 5 degrees are prepared in the controller 5 in advance. The allowable amount may be calculated by referring to a map corresponding to the above.

  In the above description, the allowable rotation amount is calculated. However, when the rotation speed in the discharge direction is controlled to be constant, the discharge rotation time, that is, FIG. 5 is used instead of calculating the allowable rotation amount. As shown in FIG. 6, the controller 5 may be made to calculate the allowable discharge rotation time using a map showing the relationship between the allowable discharge rotation time and the amount of cleaning water. In this case, it is natural that the allowable discharge rotation time with respect to the washing water amount is mapped in consideration of the rotation speed change at the beginning of the discharge rotation and at the end of the discharge rotation.

  Subsequently, the process proceeds to step F5, where the controller 5 starts driving the drum by controlling the driving of the hydraulic motor 1 and the hydraulic pump 2. At this time, the controller 5 first rotates the drum D by a predetermined amount, then rotates the drum D by the permissible rotation amount calculated in step F4, and then repeats the charging rotation and discharging rotation.

  Specifically, the predetermined amount for the charging rotation is an arbitrary value set to be equal to or larger than the allowable rotation amount of the discharging rotation.

  In this way, by setting the predetermined amount to be equal to or greater than the allowable rotation amount, even if the cleaning water is guided to the opening end side of the drum shell 20 during the discharge rotation, as shown in FIG. The water surface of the washing water can be returned to the water surface W1, which is the initial state of the discharge rotation.

  That is, since the water surface of the cleaning water can be set to the water surface W1 that is in the initial stage of the discharge rotation, the cleaning water does not spill from the drum D even if the discharge water is rotated by an allowable rotation amount.

  Therefore, as shown in FIG. 2, the washing water is in the state of the water surface W1 at the end of the charging rotation, and is in the state of the water surface W2 indicated by a one-dot chain line in the drawing at the end of the subsequent discharging rotation. The inner surface of the drum shell 20 and the surface of the blade 21 are cleaned while alternately changing to one state.

  In step F4, the allowable rotation amount is calculated, and the discharge rotation amount is integrated from the rotation speed and discharge rotation time of the drum D during the discharge rotation control of the drum D, and the rotation amount is within the allowable rotation amount range. You may make it control the rotational speed and discharge | emission rotation time of the drum D so that it may become inside.

  Then, after the start of the cleaning, in step F6, the controller 5 determines whether or not a predetermined cleaning time determined from the slump value of the live control has elapsed, and if the cleaning time has elapsed, automatic cleaning is performed. finish.

  That is, in this drum cleaning device, it is possible to prevent the cleaning water containing raw concrete from leaking out of the drum during the rotation of the drum discharge during cleaning, regardless of the amount of cleaning water, and to discharge the drum regardless of the amount of cleaning water. When rotating, the cleaning water can reach the blade and the inner wall of the drum near the inlet, which is the opening end of the drum, so that the cleaning can be reliably performed to the vicinity of the drum inlet.

  Further, the quality of cleaning can be improved without causing variations in the degree of cleaning of the drum depending on the amount of cleaning water introduced. Further, since the cleaning quality can be improved, there is no problem that the raw concrete adheres to the drum inner wall and the blade surface, and it is possible to prevent a decrease in the drum loading amount and a deterioration in the discharge performance.

  From the above, in this drum cleaning apparatus, optimum drum cleaning can be performed regardless of the amount of cleaning water input.

  Furthermore, since the operator is released from operations such as checking the cleaning status one by one and rotating the drum, it is possible to drastically reduce the operator's burden on the cleaning operation.

  Further, since the amount of sticking and sticking of the ready-mixed drum to the drum D can be reduced, the number of chipping operations for the inner surface of the drum D and the blade can be reduced.

  In the above description, the case where the operator puts the cleaning water into the drum D has been described. However, like the cleaning apparatus in the modification of the embodiment of FIG. In the case where the washing water feeding device 30 that automatically feeds the washing water into the drum D when the command is received, the step of determining whether or not the raw food is loaded in the drum D is performed. You may include in the said control procedure.

  Specifically, the cleaning water charging device 30 is provided in the middle of the piping 33, a nozzle 31 extending into the seal pipe 22, a tank 32 for storing cleaning water, a pipe 33 connecting the nozzle 31 and the tank 32, and the piping 33. A pump 34 driven by the motor M and a flow rate sensor 35 provided in the middle of the pipe 33 may be provided, and the drive control of the pump 34 may be performed by the controller 5.

  Further, a pressure sensor 8 is provided in the middle of a conduit 14a on the side for supplying the hydraulic pressure to the hydraulic motor 1 when the hydraulic motor 1 rotates the drum D in the forward direction, that is, when the rotation is turned on. A voltage signal output from the pressure sensor 8 is set to be input to the controller 5.

  It may be determined whether or not the raw control unit is loaded in the drum D depending on whether or not the pressure value detected by the pressure sensor 8 is higher than a predetermined value. Specifically, this control step is operated by the operator. It is preferable to join before and after Step F1 after the operation of the device 4.

  If it is determined that the raw control unit is loaded in the drum D, the process is terminated without cleaning, and conversely, if it is determined that the unit is not being loaded, the cleaning water feeding device 30 is driven. Then, the cleaning water amount input by the operator using the operation device 4 is put into the drum D, and the process proceeds to Step F1 or Step F2.

  In the case of this modification, in step F2, it is determined whether or not the amount of cleaning water has reached the required amount. If the amount of cleaning water has not reached the required amount, the amount of cleaning water input by the operation device 4 is stored in the tank 32. Or the operator originally entered an amount of cleaning water that is less than the required amount.

  At this time, if the operator inputs an amount of cleaning water that is less than the required amount even though there is a sufficient amount of cleaning water in the tank 32, the controller 5 controls the controller 5 so that the amount of cleaning water becomes the required amount. By putting it in the drum D, it is possible to continue the cleaning operation and reduce the operator's workload.

  In other words, the ready-mixed container has a higher viscosity than the cleaning water, is easily attached to the blade in the drum D, and the ready-mixed container that is transported compared to the empty state of the drum D or the state containing only the cleaning water. Since the inertial mass of the drum D containing the transported material increases and the torque for rotating the drum D increases, the pressure in the conduit 14a that supplies the hydraulic pressure to the hydraulic motor 1 is as follows. Since the load at the time of loading the raw control becomes higher, it can be determined whether or not the raw control is inserted into the drum D based on the fact that the pressure detected by the pressure sensor 8 is higher than the predetermined value as described above.

  Therefore, even if the drum D is being turned on or stopped by the control process in this step, the cleaning operation of the drum D is not performed when the raw control is loaded in the drum D. Even if the intention to perform cleaning is mistakenly displayed, it is possible to prevent the disadvantage that raw concrete loaded in the drum is discharged and the disadvantage that the raw concrete is scattered on roads and workplaces.

  And since the above-mentioned adverse effects are prevented, the operator is not forced to confirm whether or not there is any abnormality in the cleaning operation during the cleaning operation, so that the operator's workload is drastically reduced. Can handle cleaning with a sense of security.

  Further, in the drum cleaning apparatus of the present embodiment, the deterioration of the quality of the raw cooking appliance due to unnecessary water mixing into the raw cooking appliance due to human error is also avoided at the same time.

  Further, in the present embodiment, the detection means is referred to as the pressure sensor 8 in the present embodiment, but it is sufficient that the difference in torque due to the inertial mass of the raw control in the drum D can be detected. It may be determined whether raw control is loaded in the drum D using a pressure switch that is set so that an ON signal can be input to the controller 5 when the pressure increases or decreases.

  When the pressure sensor 8 is used, it is possible to detect a failure of the drum drive system in combination with the rotation speed sensor 7, and it is convenient in that automatic cleaning is not performed at the time of the failure. It is.

  Further, the means for detecting the loading of the raw control may be a means for detecting the torque of the rotating shaft of the hydraulic motor 1, and in this case as well, it is determined whether the raw control is loaded in the drum D as described above. it can.

  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

It is a conceptual diagram of the drum washing | cleaning apparatus in one Embodiment. It is a longitudinal cross-sectional view of the drum in one Embodiment. It is the flowchart which showed the washing | cleaning procedure of the drum washing | cleaning apparatus in one Embodiment. It is a figure which shows the relationship between the amount of washing water and allowable rotation amount. It is a figure which shows the relationship between the amount of washing water and permissible discharge rotation time. It is a conceptual diagram of the drum washing | cleaning apparatus in the modification of one Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic motor 2 Hydraulic pump 4 Operation apparatus 4a Cleaning switch 4b Switch 4c Display part 5 Controller 6 Capacity detection sensor 7 Rotation speed sensor 8 Pressure sensor 11 Signal line 14, 14a Pipe line 20 Drum shell 21 Blade 22 Seal pipe 30 Cleaning Water injection device 31 Nozzle 32 Tank 33 Piping 34 Pump 35 Flow rate sensor D Drum

Claims (6)

A drum that is rotatably mounted on a mixer truck base and has a drum having a spiral blade on the inner peripheral side, and a driving means for rotationally driving the drum, and the drum is cleaned by rotating the drum alternately in and out. In the cleaning apparatus, a drum cleaning rotation amount is controlled based on an input amount of cleaning water input into the drum. A drum that is rotatably mounted on a mixer truck base and has a drum having a spiral blade on the inner peripheral side, and a driving means for rotationally driving the drum, and the drum is cleaned by rotating the drum alternately in and out. In the cleaning apparatus, the drum cleaning rotation time is controlled based on the amount of cleaning water input into the drum. A drum that is rotatably mounted on a mixer truck base and has a drum having a spiral blade on the inner peripheral side, and a driving means for rotationally driving the drum, and the drum is cleaned by rotating the drum alternately in and out. In the cleaning apparatus, the drum cleaning apparatus controls the discharge rotation time and discharge rotation speed of the drum based on the input amount of the cleaning water input into the drum. The drum cleaning apparatus according to claim 1, wherein the discharge rotation amount is controlled based on an input amount of the cleaning water input into the drum and a forward / backward inclination of the mixer truck. The drum cleaning apparatus according to claim 2, wherein the discharge rotation time is controlled based on an input amount of the cleaning water input into the drum and a forward / backward inclination of the mixer truck. 4. The drum cleaning apparatus according to claim 3, wherein the discharge rotation time and the discharge rotation speed are controlled based on an input amount of the cleaning water input into the drum and a forward / backward inclination of the mixer truck.

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