Concrete mixer truck

Abstract

To enable rapid discharge of ready mixed concrete with a single vehicle during an emergency.SOLUTION: A concrete mixer truck 100 comprises: a mixer drum 10 rotatably mounted on a vehicle; a water tank 31 in which water for cleaning is stored; a water pump 32 connected to the water tank 31; and a hydraulic motor 51 which is driven by water of the water tank 31 supplied from the water pump 32, and rotates the mixer drum 10.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a mixer vehicle. [Background technology]

[0002] Patent Document 1 discloses a technology for dealing with a breakdown of the hydraulic pump of a concrete mixer truck by connecting the hydraulic pump of a backup truck to the hydraulic motor of the broken-down truck to quickly discharge the ready-mixed concrete from the drum. Patent Document 2 discloses a mixer truck in which a tool is connected to the emergency input section at the tip of the input shaft of the reducer and operated to rotate the mixer drum via the reducer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-329628 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-68532 Summary of the Invention [Problem to be solved by the invention]

[0004] In an emergency situation where the mixer drum loses power from a drive source such as a hydraulic motor due to an abnormality, the mixer drum cannot be rotated in the direction of discharge of the fresh concrete to discharge the fresh concrete, which causes the fresh concrete inside the mixer drum to solidify.

[0005] The technology of Patent Document 1 uses a backup vehicle to discharge the ready-mixed concrete in an emergency, but if a backup vehicle cannot be arranged, there is a risk that the ready-mixed concrete will need to be scraped out of the mixer drum to prevent it from solidifying.The technology of Patent Document 2 is capable of rotating the mixer drum in an emergency, but because it is structured to connect tools, the need to connect tools means that it takes time and effort to discharge the ready-mixed concrete inside the mixer drum, and there is a risk that the hardening of the ready-mixed concrete inside the mixer drum will progress.

[0006] The present invention has been made in view of such problems, and has as its object to enable the rapid discharge of ready-mixed concrete by a single vehicle in an emergency. [Means for solving the problem]

[0007] The present invention is a mixer vehicle characterized by comprising a mixer drum rotatably mounted on the vehicle, a water tank in which water to be used for cleaning is stored, a water pump connected to the water tank, and a hydraulic motor driven by water from the water tank supplied by the water pump to rotate the mixer drum.

[0008] According to this invention, in an emergency when the mixer drum loses power from its drive source, the water tank and water pump, which are generally installed as standard equipment on mixer trucks, can be used to drive the hydraulic motor and rotate the mixer drum. This makes it possible to quickly discharge ready-mixed concrete using a single vehicle.

[0009] The present invention is also characterized in that a first socket into which a first plug is detachably attached is connected to the water discharge port of the water pump, a second socket into which a second plug is detachably attached is connected to the water supply port of the water hydraulic motor, and the water hydraulic motor is connected to the water pump through piping provided with a first plug and a second plug that are detachably attached to the first socket and the second socket.

[0010] According to this invention, in an emergency, simply by connecting a hose or other pipe, it is possible to use the water stored in the water tank to drive the water hydraulic motor, thereby enabling a quick response.

[0011] The present invention is also characterized in that the water hydraulic motor is connected to the water pump through piping, and the piping is provided with a valve that can switch between communication and cut-off between the water hydraulic motor and the water pump.

[0012] According to this invention, in an emergency, simply by opening the valve, it is possible to use the water stored in the water tank to drive the water hydraulic motor, thereby enabling a quicker response. [Effects of the Invention]

[0013] These inventions make it possible to quickly discharge ready-mixed concrete using a single vehicle in an emergency. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a plan view of a mixer truck according to an embodiment of the present invention, as viewed from the side. [Figure 2] 1 is a configuration diagram showing a main part of a mixer vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0016] First, the overall configuration of a mixer truck 100 according to an embodiment of the present invention will be described with reference to Figures 1 and 2. The mixer truck 100 is a vehicle that transports so-called ready-mixed concrete (hereinafter referred to as "ready-mixed concrete") such as mortar or ready-mixed concrete, and is driven by the power of an engine (not shown). The driving source for driving may be, for example, a driving motor. The following description will be given of the case where the mixer truck 100 is loaded with ready-mixed concrete.

[0017] As shown in Figure 1, the mixer truck 100 comprises a driver's cab 1, a frame 2 extending in the fore-and-aft direction of the vehicle, a mixer drum 10 rotatably mounted on the frame 2, a drum drive unit 20 that drives the mixer drum 10 to rotate, a hopper 15 that guides ready-mixed concrete fed from outside into the mixer drum 10, and a chute 17 that guides the ready-mixed concrete discharged from the mixer drum 10 to a predetermined position.

[0018] The mixer drum 10 is a cylindrical container that rotates about a rotation axis C1. An opening 10a, through which ready-mixed concrete is charged and discharged, is provided at the rear end of the mixer drum 10 on the rear side of the vehicle, and a drive shaft 11 that extends outward along the rotation axis C1 is provided at the front end on the front side of the vehicle. The mixer drum 10 is supported by the frame 2 with the rear end, where the opening 10a is provided, raised higher than the front end.

[0019] The drive shaft 11 of the mixer drum 10 is connected to a drum drive device 20. As shown in FIG. 2 , the drum drive device 20 includes a drive motor 21 that is a drive source for the mixer drum 10, and a reducer 22 that reduces the input rotation from the drive motor 21 and outputs it to the mixer drum 10. The drive shaft 11 of the mixer drum 10 is connected to the drive motor 21 via the reducer 22. The drive motor 21 is an electric motor that can rotate forward and backward. Therefore, the mixer drum 10 is rotationally driven in the forward or reverse direction by the drive motor 21. The drive source for the mixer drum 10 may be a hydraulic motor.

[0020] Returning to FIG. 1 , a pair of blades 12, 13 are spirally arranged along the inner wall surface of the mixer drum 10 within the mixer drum 10. Each blade 12, 13 is divided into a front blade 12a, 13a arranged on the front side of the vehicle and a rear blade 12b, 13b arranged on the rear side of the vehicle at approximately the middle of the mixer drum 10. Each rear blade 12b, 13b is joined to the inner wall surface of the mixer drum 10 at the opening 10a and is joined to a cylindrical seal pipe 14 arranged on the rotation axis C1 of the mixer drum 10. The seal pipe 14 is provided to smoothly guide the ready-mixed concrete charged into the hopper 15 into the interior of the mixer drum 10.

[0021] The hopper 15 is disposed above the opening 10a of the mixer drum 10 to guide the ready-mixed concrete fed from above the mixer truck 100 into the mixer drum 10 through the seal pipe 14. A hopper cover 16 that covers the opening of the hopper 15 is provided above the hopper 15 and is rotatable via a hinge 16a. Meanwhile, a chute 17 is disposed below the opening 10a of the mixer drum 10 to guide the ready-mixed concrete discharged from the mixer drum 10 to a predetermined position.

[0022] The mixer vehicle 100 has the following operating states of the mixer drum 10: a stirring state in which the mixer drum 10 is rotated at a first rotational speed to stir the ready-mixed concrete inside the mixer drum 10; a kneading state in which the mixer drum 10 is rotated at a second rotational speed faster than the first rotational speed to knead the ready-mixed concrete inside the mixer drum 10; and a discharge state in which the mixer drum 10 is rotated in the opposite direction to the stirring and kneading states to discharge the ready-mixed concrete from the opening 10a.

[0023] In the mixing state, the mixer drum 10 is driven to rotate in the forward direction, which is counterclockwise when viewed from the rear of the vehicle. In the mixing state, the blades 12, 13 rotate forward together with the mixer drum 10, so that the ready-mixed concrete in the mixer drum 10 moves toward the front of the mixer drum 10 while being mixed. By rotating the mixer drum 10 in this way to mix the ready-mixed concrete, separation and solidification of the ready-mixed concrete are prevented.

[0024] In the kneading state, the mixer drum 10 is driven to rotate in the forward rotation direction at a second rotation speed that is faster than the first rotation speed of the mixer drum 10 in the agitation state. The kneading state is performed to knead the ready-mixed concrete before discharging it.

[0025] In the discharge state, the mixer drum 10 is driven to rotate in the reverse direction, that is, clockwise when viewed from the rear of the vehicle. In the discharge state, the blades 12, 13 rotate together with the mixer drum 10, so that the ready-mixed concrete moves to the rear of the mixer drum 10 while being agitated. By rotating the mixer drum 10 in the reverse direction in this way, the ready-mixed concrete can be discharged from the opening 10a of the mixer drum 10. The ready-mixed concrete discharged from the opening 10a of the mixer drum 10 is guided to a predetermined position via a chute 17.

[0026] 2, the mixer vehicle 100 includes a water tank 31 that stores water used for cleaning, and a water pump 32 connected to the water tank 31. The water tank 31 and the water pump 32 are permanently installed on the mixer vehicle 100 as standard equipment, and the user fills the water tank 31 with water. A water supply port 31o of the water tank 31 communicates with a water suction port 32i of the water pump 32 via a pipe 33.

[0027] The water pump 32 is an electric pump and includes a pump 32a connected to the water tank 31 and a motor 32b that drives the pump 32a. The motor 32b is an electric motor that is driven by power supplied from a battery 40. The battery 40 has an output voltage of, for example, DC 24V and is mounted on the mixer vehicle 100 as a low-voltage power supply. The motor 32b is electrically connected to the battery 40 via a first switch 41, which is an operation unit for driving and stopping the water pump 32. When the user turns the first switch 41 on and off, the water pump 32 is driven and stopped.

[0028] A first quick-connect socket 60a serving as a first socket is connected to the water pump 32 via piping 34, and the first quick-connect socket 60a communicates with the water discharge port 32o of the water pump 32. A first quick-connect plug 60b serving as a first plug is detachably attached to the first quick-connect socket 60a. The first quick-connect socket 60a, together with the first quick-connect plug 60b, constitutes a first quick-connect fitting 60, which is a fitting that detachably connects an emergency hose 65 (described below) to the piping 34 that communicates with the water discharge port 32o of the water pump 32.

[0029] The first quick socket 60a has a plug receptacle (not shown) into which the first quick plug 60b is attached and detached, and when the first quick plug 60b is not attached, communication between the inside and outside through the plug receptacle is blocked. On the other hand, when the first quick plug 60b is inserted into the plug receptacle of the first quick socket 60a, the internal flow path of the first quick plug 60b inserted into the plug receptacle is connected to the internal flow path of the first quick socket 60a. The same applies to the second quick joint 70 described below.

[0030] Another quick plug 80 that can be replaced with the first quick plug 60b can be attached to the first quick socket 60a, and in Fig. 2, the other quick plug 80 provided at one end of the piping 35 is attached to the first quick socket 60a. The first quick socket 60a communicates with a shower head (not shown) for cleaning through the other quick plug 80 and the piping 35 that is configured from a hose or the like.

[0031] As shown in Figures 1 and 2, the mixer truck 100 further includes a water motor 51 that rotates the mixer drum 10. The water motor 51 serves as an emergency drive source for the mixer drum 10 and is connected to the mixer drum 10 via a reducer 22, separate from the drive motor 21. The water motor 51 is connected to an input gear 22a, which is an input rotating member of the reducer 22, from the axial side opposite to the side to which the drive motor 21 is connected. The input rotating member may be the input shaft 22c of the reducer 22. The rotating shaft 21a of the drive motor 21 and the rotating shaft 51a of the water motor 51 are connected to the input shaft 22c of the reducer 22 from opposite sides to each other.

[0032] The water hydraulic motor 51 is arranged to rotate about a common axis A1 with the drive motor 21 and the input gear 22a of the reducer 22. The common axis A1 is, for example, the rotational axis of the input gear 22a, and in this case, the rotational shaft 21a of the drive motor 21 and the rotational shaft 51a of the water hydraulic motor 51 are aligned with the rotational axis of the input gear 22a, so that the drive motor 21, water hydraulic motor 51, and input gear 22a are arranged coaxially, so to speak. As a result, radial protrusion of the water hydraulic motor 51 is suppressed, and compactness is achieved.

[0033] The input gear 22a of the reducer 22 meshes with the output gear 22b of the reducer 22. The number of teeth of the output gear 22b is set to be greater than the number of teeth of the input gear 22a, and the rotation of the input gear 22a is reduced by the output gear 22b. The drive shaft 11 of the mixer drum 10 is connected to the output gear 22b of the reducer 22 from the axial side opposite to the side to which the drive motor 21 is connected. Meanwhile, the rotation axes of the input gear 22a and the output gear 22b are spaced apart from each other in the radial direction, thereby creating extra space for installing a water hydraulic motor 51 that is connected to the input gear 22a from the same axial side as the mixer drum 10. The reducer 22 may have a structure in which an additional gear is interposed between the input gear 22a and the output gear 22b, or may have a structure including a planetary gear mechanism.

[0034] The mixer vehicle 100 further includes an electromagnetic clutch 52. The electromagnetic clutch 52 is a brake and is provided on the case 22d of the reducer 22. The input shaft 22c of the reducer 22 passes through the electromagnetic clutch 52 and is connected to the rotating shaft 51a of the water hydraulic motor 51. Therefore, the water hydraulic motor 51 is connected to the input gear 22a of the reducer 22 via the input shaft 22c of the reducer 22, which passes through the electromagnetic clutch 52.

[0035] When engaged, the electromagnetic clutch 52 fixes the input shaft 22c of the reducer 22 to the case 22d of the reducer 22, thereby restricting the rotation of the input shaft 22c, and thereby restricting the rotation of the input gear 22a of the reducer 22 from the side opposite to the side to which the drive motor 21 is connected. When released, the electromagnetic clutch 52 releases the fixation between the input shaft 22c of the reducer 22 and the case 22d of the reducer 22, thereby releasing the restriction on the rotation of the input gear 22a. The input shaft 22c passes through the electromagnetic clutch 52 and constitutes a rotating shaft whose rotation is restricted by the electromagnetic clutch 52.

[0036] The electromagnetic clutch 52 is disengaged when energized and engaged when de-energized. In other words, the electromagnetic clutch 52 is a normally closed type electromagnetic clutch (a non-excitation type electromagnetic brake) that is disengaged and engaged depending on whether or not it is energized. Instead of the electromagnetic clutch 52, an electric clutch that is driven by an electric actuator and is disengaged when energized and engaged when de-energized may be used.

[0037] A second one-touch socket 70a serving as a second socket is connected to the water hydraulic motor 51 through the piping 36, and the second one-touch socket 70a communicates with the water supply port 51i of the water hydraulic motor 51. The second one-touch socket 70a, together with a second one-touch plug 70b serving as a second plug that is detachably attached to the second one-touch socket 70a, constitutes a second one-touch joint 70 that detachably connects the emergency hose 65 to the piping 36 that communicates with the water supply port 51i of the water hydraulic motor 51, and the second one-touch plug 70b, together with the first one-touch plug 60b, is provided on the emergency hose 65. The emergency hose 65 is a rubber hose (a hose mainly made of rubber, etc.) and corresponds to a pipe. The first one-touch plug 60b is provided at one end of the emergency hose 65, and the second one-touch plug 70b is provided at the other end of the emergency hose 65. The water tank 31 is further connected to the water hydraulic motor 51 via a pipe 37 that returns water from the water hydraulic motor 51 to the water tank 31 , and a water outlet 51 o of the water hydraulic motor 51 communicates with a water return port 31 i of the water tank 31 .

[0038] The controller 90 is a control device for the mixer drum 10 and is composed of a microcomputer equipped with a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), and I / O interface (Input / Output Interface). The RAM stores data for CPU processing, the ROM stores the CPU's control program and other programs in advance, and the I / O interface is used for inputting and outputting information to and from connected devices. By operating the CPU, RAM, and other programs in accordance with the programs stored in the ROM, the operation of the drive motor 21 is controlled, thereby controlling the mixer drum 10. The controller 90 also controls the operation of the electromagnetic clutch 52.

[0039] The controller 90 is programmed to be able to execute at least the processes necessary to execute the control according to this embodiment. The controller 90 may be composed of multiple microcomputers. The controller 90 may be configured as a single device, or may be divided into multiple devices and configured to perform distributed processing of the control according to this embodiment among the multiple devices.

[0040] The electromagnetic clutch 52 is disengaged in response to a rotation command for the mixer drum 10 under the control of the controller 90. The presence or absence of a rotation command for the mixer drum 10 can be determined based on internal processing of the controller 90, for example, by checking whether a drive flag that is turned on when the mixer drum 10 is driven is on or off.

[0041] A clutch release command is input from the controller 90 to the electromagnetic clutch 52 in response to a rotation command for the mixer drum 10, and as a result, the electromagnetic clutch 52 is energized and released by the controller 90. Therefore, when the mixer drum 10 rotates normally in response to the rotation command, the rotation of the mixer drum 10 is not hindered by the electromagnetic clutch 52.

[0042] When the rotation command for the mixer drum 10 is no longer issued, the controller 90 no longer issues a clutch release command to the electromagnetic clutch 52, causing the electromagnetic clutch 52 to be de-energized and engaged by the controller 90. As a result, the mixer drum 10 is fixed to the case 22d of the reducer 22 via the electromagnetic clutch 52. As a result, immediately after the rotation of the mixer drum 10 stops, reverse rotation of the mixer drum 10 due to uneven distribution of ready-mixed concrete inside the mixer drum 10 is restricted, preventing impact caused by reverse rotation.

[0043] The electromagnetic clutch 52 is electrically connected to the battery 40 via a second switch 42, which is an operation unit for switching between energizing and de-energizing the electromagnetic clutch 52, and power can also be supplied from the battery 40 via the second switch 42. Therefore, even if the electromagnetic clutch 52 is engaged in a de-energized state, turning on the second switch 42 will cause the electromagnetic clutch 52 to be energized and released, thereby releasing the fixation of the mixer drum 10.

[0044] In the mixer truck 100 configured as described above, when the user turns on the first switch 41 to operate the water pump 32 after discharging ready-mixed concrete, water is supplied from the water pump 32 to the shower head (not shown) through the pipes 34 and 35. The shower head can be switched between discharging and stopping water, and when the shower head is switched to the water discharge side while water is being supplied to the shower head from the water pump 32, high-pressure water is sprayed from the shower head. This allows the inside and outside of the mixer drum 10 to be high-pressure washed using the shower head.

[0045] The water in the water tank 31 is usually not used up in just one cleaning after discharging the ready-mixed concrete, and the user refills the water tank 31 with water after cleaning in preparation for discharging the next load of ready-mixed concrete to be transported. Therefore, when the mixer truck 100 transports ready-mixed concrete, water is stored in the water tank 31.

[0046] If a situation (emergency) occurs in which the drive motor 21 loses power due to an abnormality or the like while the ready-mixed concrete is being transported or at the place where the ready-mixed concrete is used, the mixer drum 10 will no longer be driven to rotate, and the electromagnetic clutch 52 will no longer be energized and will be engaged.

[0047] In an emergency, the first quick plug 60b provided on the emergency hose 65 is attached to the first quick socket 60a, and the second quick plug 70b provided on the emergency hose 65 is attached to the second quick socket 70a, thereby connecting the water hydraulic motor 51 and the water pump 32 through the emergency hose 65. Furthermore, in this state, by turning on the first and second switches 41 and 42, water can be supplied from the water pump 32 to the water hydraulic motor 51 through the emergency hose 65, and power can be supplied from the battery 40 to the electromagnetic clutch 52 to release it.

[0048] Therefore, by turning on the first and second switches 41, 42, the water hydraulic motor 51 is driven by water from the water tank 31 supplied by the water pump 32 to rotate the mixer drum 10. The water hydraulic motor 51 rotates the mixer drum 10 in the reverse direction, thereby rotating the mixer drum 10 in the direction in which the ready-mixed concrete is discharged.

[0049] As a result, in the mixer truck 100, in an emergency when the drive motor 21 loses power, the water tank 31 and water pump 32, which are permanently installed as standard equipment on the mixer truck 100, can be used to drive the hydraulic motor 51 and rotate the mixer drum 10, making it possible to quickly discharge ready-mixed concrete using a single vehicle. Also, simply by connecting the emergency hose 65, it is possible to use the water stored in the water tank 31 to drive the hydraulic motor 51, allowing for a quick response.

[0050] The emergency hose 65 can be stored as an accessory of the mixer truck 100 except in emergencies, so it does not take up space under normal circumstances. Note that, like the emergency hose 65, the piping 37 may also be configured as a detachable hose or other piping, and in this case too, it does not take up space under normal circumstances.

[0051] The water hydraulic motor 51 is connected to the mixer drum 10 via a reducer 22, which reduces the rotation of the drive motor 21 and transmits it to the mixer drum 10, thereby utilizing the reducer 22 for driving the mixer drum 10 as is. This eliminates the need for a new mechanism for speed reduction, simplifying the emergency configuration. Furthermore, since in an emergency it is sufficient to obtain the minimum rotation speed (for example, 1 to 2 rpm) required to discharge the ready-mixed concrete from the mixer drum 10, by utilizing the reduction ratio of the reducer 22, it is possible to use an extremely small motor as the water hydraulic motor 51.

[0052] After the discharge of the ready-mixed concrete is completed, the operation of the water hydraulic motor 51 can be stopped by turning off the first and second switches 41, 42, and the electromagnetic clutch 52 can be engaged to fix the mixer drum 10. This ensures safety during operations such as chipping to remove ready-mixed concrete stuck inside the mixer drum 10. After the discharge of the ready-mixed concrete is completed, the remaining water in the water tank 31 can be used for cleaning.

[0053] Instead of configuring the emergency hose 65 to be detachable using the first one-touch coupling 60 and the second one-touch coupling 70, the emergency hose 65 may be configured as follows: That is, the emergency hose 65 may be configured as a piping (permanent piping) such as a metal pipe, and the water hydraulic motor 51 and the water pump 32 may be connected through this piping, and a valve may be provided in this piping that can switch between communication and cut-off between the water hydraulic motor 51 and the water pump 32.

[0054] In this case, in an emergency, simply by opening the valve, it is possible to use the water stored in the water tank 31 to drive the water hydraulic motor 51, allowing for a quicker response.

[0055] The configuration, operation, and effects of the embodiment of the present invention will be described below.

[0056] The mixer vehicle 100 comprises a mixer drum 10 rotatably mounted on the vehicle, a water tank 31 storing water used for cleaning, a water pump 32 connected to the water tank 31, and a water hydraulic motor 51 driven by water from the water tank 31 supplied by the water pump 32 to rotate the mixer drum 10.

[0057] With this configuration, in an emergency when the drive motor 21 loses power, the water tank 31 and water pump 32, which are permanently installed as standard equipment on the mixer vehicle 100, can be used to drive the hydraulic motor 51 and rotate the mixer drum 10. Therefore, ready-mixed concrete can be quickly discharged using a single vehicle.

[0058] The water discharge port 32o of the water pump 32 is connected to a first one-touch socket 60a to which a first one-touch plug 60b is attached and detached, and the water supply port 51i of the water hydraulic motor 51 is connected to a second one-touch socket 70a to which a second one-touch plug 70b is attached and detached, and the water hydraulic motor 51 is connected to the water pump 32 through an emergency hose 65, which is a pipe provided with the first one-touch plug 60b and the second one-touch plug 70b that are attached and detached to the first one-touch socket 60a and the second one-touch socket 70a.

[0059] According to this configuration, in an emergency, simply connecting the emergency hose 65 makes it possible to use the water stored in the water tank 31 to drive the water hydraulic motor 51, thereby enabling a quick response.

[0060] The water hydraulic motor 51 is connected to the water pump 32 through a piping such as a metal pipe, and the piping may be provided with a valve that can switch between communication and cut-off between the water hydraulic motor 51 and the water pump 32.

[0061] Even with this configuration, in an emergency, simply by opening the valve, it is possible to use the water stored in the water tank 31 to drive the water hydraulic motor 51, thereby enabling a quicker response.

[0062] Although the embodiments of the present invention have been described above, the above embodiments merely illustrate some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above embodiments. [Explanation of symbols]

[0063] 10···Mixer drum, 31···Water tank, 32···Water pump, 32o···Water outlet, 51···Water pressure motor, 51i···Water supply port, 60a···First one-touch socket (first socket), 60b···First one-touch plug (first plug), 65···Emergency hose (piping), 70a···Second one-touch socket (second socket), 70b···Second one-touch plug (second plug), 100···Mixer truck

Claims

1. A mixer truck, a mixer drum rotatably mounted on the vehicle; a water tank storing water to be used for cleaning; a water pump connected to the water tank; a water motor that is driven by the water in the water tank supplied from the water pump to rotate the mixer drum, A mixer truck characterized by:

2. The mixer vehicle according to claim 1, a first socket to which a first plug is attached and detached is connected to a water discharge port of the water pump; a second socket to which a second plug is detachably attached is connected to the water supply port of the water hydraulic motor; The water motor is connected to the water pump through a pipe provided with the first plug and the second plug that are detachably attached to the first socket and the second socket. A mixer truck characterized by:

3. The mixer vehicle according to claim 1, The water motor is connected to the water pump through a pipe, and a valve is provided in the pipe to switch between communication and cut-off between the water motor and the water pump. A mixer truck characterized by:

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