Concrete mixer truck

Abstract

To enable discharge of ready mixed concrete with a single vehicle during an emergency without adding a driving source.SOLUTION: A mixer vehicle 100 comprises: a mixer drum 10 rotatably mounted on a vehicle; a water tank 31 in which water used for cleaning is stored; and a water pump 32 having a pump 32a connected to the water tank 31 and a motor 32b for driving the pump 32a. The motor 32b is detachably or disconnectably connected to the mixer drum 10 and is capable of rotating the mixer drum 10.SELECTED DRAWING: Figure 3

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 as an emergency measure, but if a backup vehicle cannot be arranged, it may be necessary to scrape the ready-mixed concrete out of the mixer drum to prevent it from solidifying.The technology of Patent Document 2 can rotate the mixer drum in an emergency, but requires a new tool that can be rotated as a drive source to rotate the mixer drum.

[0006] The present invention has been made in view of such problems, and has as its object to make it possible to discharge ready-mixed concrete using a single vehicle in an emergency without adding an additional driving source. [Means for solving the problem]

[0007] The present invention is a mixer vehicle comprising a mixer drum rotatably mounted on the vehicle, a water tank for storing water used for cleaning, and a water pump having a pump connected to the water tank and a motor for driving the pump, wherein the motor is detachably or disconnectably connected to the mixer drum and is capable of rotating the mixer drum.

[0008] According to this invention, in an emergency when the mixer drum loses power from its drive source, the mixer drum can be rotated using the water pump motor that is generally installed as standard equipment on mixer trucks, so that ready-mixed concrete can be discharged using a single vehicle without the need for an additional drive source.

[0009] The present invention is also characterized in that a connecting portion is provided on the drive shaft of the motor, and the motor is removed from a permanent position where the motor is connected to the pump and connected to the mixer drum via the connecting portion.

[0010] According to this invention, in an emergency, the motor can be removed from its permanent location and reconnected to the mixer drum via the connecting part, so that the motor of the water pump normally used for cleaning can be used as the drive source for the mixer drum in an emergency, eliminating the need to add a new drive source.

[0011] The present invention also features a mixer drum including a drive source that drives a mixer drum to rotate; a reducer having an input gear to which the drive source is connected and that reduces the input rotation from the drive source and outputs it to the mixer drum; an electric clutch that functions as a brake that regulates rotation of the input gear of the reducer from the side opposite to the side to which the drive source is connected and that is released and cut off depending on whether electricity is applied; and a rotating shaft that is connected to the input gear on the side opposite to the side to which the drive source is connected, passes through the electric clutch, and has its rotation regulated by the electric clutch, and the motor is connected to the input gear by being connected to the rotating shaft via a connecting portion.

[0012] According to this invention, the electric clutch prevents the mixer drum from spinning freely when it is no longer driven by the drive source. Furthermore, the motor is connected to the input gear of the reducer by connecting it to the rotating shaft that passes through the electric clutch via a connecting part, so the space on the opposite side to the side where the drive source is connected can be effectively utilized. Furthermore, even if the motor is connected in this way, in an emergency, the mixer drum can be rotated by the motor by releasing the electric clutch, so that ready-mix concrete can also be discharged. [Effects of the Invention]

[0013] According to these inventions, in an emergency, ready-mixed concrete can be discharged using a single vehicle without the need for an additional driving source. [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. [Figure 3] This is a diagram showing the installation state of the motor when discharging ready-mixed concrete in an emergency. [Figure 4] FIG. 2 is a diagram illustrating an example of a power transmission member. 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, or an engine and 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 installed at a permanent installation position L1, which is a position where the motor 32b is disposed while connected to the pump 32a (the pump 32a connected to the water tank 31). The pump 32a includes a rotating shaft 32aa and a flange 32ab attached to the tip of the rotating shaft 32aa. The motor 32b includes a drive shaft 32ba and a flange 32bb attached to the tip of the drive shaft 32ba. The drive shaft 32ba of the motor 32b is connected to the rotating shaft 32aa of the pump 32a by bolting the flange 32bb to the flange 32ab. The flange 32bb corresponds to a connecting portion.

[0028] The motor 32b is an electric motor and is driven by power supplied from a battery 40. The battery 40 is, for example, a battery with an output voltage of 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 starting and stopping the water pump 32. When a user turns the first switch 41 on and off, the water pump 32 is started and stopped. The first switch 41 is provided on the motor 32b, thereby integrating the first switch 41 with the motor 32b. The first switch 41 can be provided on the motor 32b via a bracket (not shown) or the like. The water outlet 32o of the water pump 32 is connected to a shower head (not shown) for cleaning through piping 34 formed of a hose or the like.

[0029] The reducer 22 has an input gear 22a to which the drive motor 21 is connected, an output gear 22b that meshes with the input gear 22a, an input shaft 22c that is connected to the input gear 22a on the side opposite to the side to which the drive motor 21 is connected and rotates integrally with the input gear 22a, and a case 22d that accommodates the input gear 22a and the output gear 22b. 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.

[0030] The drive shaft 11 of the mixer drum 10 is connected to the output gear 22b of the reducer 22 from the axially opposite side 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, which creates a surplus space to the side of the input gear 22a on the side opposite to the side to which the drive motor 21 is connected. 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.

[0031] The mixer vehicle 100 further includes an electromagnetic clutch 51. The electromagnetic clutch 51 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 51, and a flange 22ca is provided on the tip of the input shaft 22c that passes through the electromagnetic clutch 51. When engaged, the electromagnetic clutch 51 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 disengaged, the electromagnetic clutch 51 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 51 and constitutes a rotating shaft whose rotation is restricted by the electromagnetic clutch 51.

[0032] The electromagnetic clutch 51 is disengaged when energized and engaged when de-energized. In other words, the electromagnetic clutch 51 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 51, an electric clutch that is driven by an electric actuator and is disengaged when energized and engaged when de-energized may be used. The electric clutch 51 functions as a brake that restricts the rotation of the input gear 22a from the side opposite to the side to which the drive motor 21 is connected, and corresponds to an electric clutch that is disengaged and engaged depending on whether or not it is energized.

[0033] The controller 50 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 program stored in the ROM, the operation of the drive motor 21 is controlled, thereby controlling the mixer drum 10. The controller 50 also controls the operation of the electromagnetic clutch 51.

[0034] The controller 50 is programmed to be able to execute at least the processes necessary to execute the control according to this embodiment. The controller 50 may be composed of multiple microcomputers. The controller 50 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.

[0035] The electromagnetic clutch 51 is disengaged in response to a rotation command for the mixer drum 10 under the control of the controller 50. The presence or absence of a rotation command for the mixer drum 10 can be determined based on internal processing of the controller 50, for example, by checking whether a drive flag that is turned on when the mixer drum 10 is driven is on or off.

[0036] A clutch release command is input from the controller 50 to the electromagnetic clutch 51 in response to a rotation command for the mixer drum 10, and as a result, the electromagnetic clutch 51 is energized and released by the controller 50. 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 51.

[0037] When the rotation command for the mixer drum 10 is no longer given, the controller 50 no longer inputs a clutch release command to the electromagnetic clutch 51, causing the electromagnetic clutch 51 to be de-energized from the controller 50 and engaged. As a result, the mixer drum 10 is fixed to the case 22d of the reducer 22 via the electromagnetic clutch 51. As a result, immediately after the rotation of the mixer drum 10 stops, reverse rotation of the mixer drum 10 due to unevenness of the ready-mixed concrete inside the mixer drum 10 is restricted, preventing impact caused by reverse rotation.

[0038] The electromagnetic clutch 51 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 51, and power can also be supplied from the battery 40 via the second switch 42. Therefore, even if the electromagnetic clutch 51 is engaged in a de-energized state, turning on the second switch 42 will cause the electromagnetic clutch 51 to be energized and released, thereby releasing the fixation of the mixer drum 10.

[0039] 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 piping 34. 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.

[0040] If a power loss from the drive motor 21 occurs due to an abnormality or other reason (emergency) during the transportation of ready-mixed concrete or at the site where the ready-mixed concrete is used, the mixer drum 10 will no longer be driven to rotate, and the electromagnetic clutch 51 will no longer be energized and will be engaged. In this case, the mixer truck 100 can discharge ready-mixed concrete as follows.

[0041] 3 is a diagram showing the installation state of motor 32b when discharging ready-mixed concrete in an emergency. As shown in FIG. 3, when discharging ready-mixed concrete in an emergency, motor 32b is removed from permanent installation position L1 and connected to mixer drum 10 via flange 32bb. Specifically, motor 32b removed from permanent installation position L1 is installed at connection position L2 with mixer drum 10, which is located to the side of input gear 22a of reducer 22, opposite the side to which drive motor 21 is connected. Flange 32bb of motor 32b is connected by bolts to flange 22ca provided at the tip of input shaft 22c of reducer 22. As a result, motor 32b is connected to input shaft 22c via flange 32bb, and is connected to input gear 22a via input shaft 22c of reducer 22, which passes through electromagnetic clutch 51. As a result, motor 32b is detachably connected to mixer drum 10 via flange 32bb, enabling mixer drum 10 to rotate.

[0042] Therefore, during emergency discharge of ready-mixed concrete, motor 32b is connected to mixer drum 10 via reducer 22 separately from drive motor 21 as an emergency drive source for mixer drum 10. Motor 32b is connected to input gear 22a of reducer 22 from the side opposite to the side connected to drive motor 21, and rotating shaft 21a of drive motor 21 and drive shaft 32ba of motor 32b are connected to input gear 22a of reducer 22 from opposite sides to each other. Flange 22ca is the other connecting part that is connected to flange 32bb, which is one connecting part.

[0043] The motor 32b, when connected to the mixer drum 10, is arranged to rotate around 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 rotation axis of the input gear 22a. In this case, the rotation axis 21a of the drive motor 21 and the drive shaft 32ba of the motor 32b are aligned with the rotation axis of the input gear 22a, so that the drive motor 21, the motor 32b, and the input gear 22a are arranged coaxially. As a result, the radial protrusion of the motor 32b is suppressed, resulting in a more compact design.

[0044] When discharging ready-mixed concrete in an emergency, if the first and second switches 41, 42 are turned on with the motor 32b connected to the mixer drum 10, power can be supplied from the battery 40 to the motor 32b to drive the motor 32b, and power can be supplied from the battery 40 to the electromagnetic clutch 51 to release the electromagnetic clutch 51. This allows the mixer drum 10 to rotate with the motor 32b even in an emergency.

[0045] The motor 32b rotates the mixer drum 10 in the reverse direction while connected to the mixer drum 10. In other words, the rotation direction of the motor 32b at the permanent installation position L1 is set so that the motor 32b connected to the mixer drum 10 rotates in the reverse direction. Therefore, when the first switch 41 is turned on, the motor 32b rotates the mixer drum 10 in the reverse rotation direction, thereby rotating the mixer drum 10 in the ready-mixed concrete discharge direction, and thereby the ready-mixed concrete is discharged from the mixer drum 10.

[0046] In this way, in the mixer truck 100, in an emergency when the drive motor 21 loses power, the mixer drum 10 can be rotated using the water pump 32 that is permanently installed as standard equipment on the mixer truck 100, so ready-mixed concrete can be discharged using a single vehicle without adding an additional drive source. This reduces the cost increase that would otherwise be incurred by adding a new drive source. In addition, because the water pump 32 is frequently used for cleaning, the risk of it not working when needed is reduced compared to when an additional drive source that is only activated in an emergency is provided.

[0047] Motor 32b is connected to mixer drum 10 via reducer 22, which reduces the rotation of drive motor 21 and transmits it to mixer drum 10, thereby utilizing the reducer 22 for driving mixer drum 10 as is. This eliminates the need for a new mechanism for deceleration, simplifying the emergency configuration. Furthermore, since it is sufficient in an emergency 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 reducer 22, it is possible to use an extremely small motor as motor 32b.

[0048] After the discharge of the ready-mixed concrete is completed, the operation of the motor 32b can be stopped by turning off the first and second switches 41, 42, and the electromagnetic clutch 51 can be engaged to restrict the rotation of the mixer drum 10. This ensures safety during work such as chipping work to remove ready-mixed concrete stuck inside the mixer drum 10.

[0049] After the ready-mixed concrete has been discharged, the motor 32b can be removed by releasing the bolts connecting the flange 22ca to the flange 32bb, and by reconnecting the removed motor 32b to the pump 32a and turning on the first switch 41, cleaning can be performed using water from the water tank 31.

[0050] The wiring connecting the first switch 41 provided on the motor 32b and the battery 40 can be set to a length with some leeway in preparation for the case where the motor 32b installed at the permanent installation position L1 is installed at the connection position L2 with the mixer drum 10. Alternatively, the wiring may be extended using an extension cable or the like to connect the first switch 41 and the battery 40.

[0051] The water pump 32 may be an integrated pump-motor type in which the pump 32a and motor 32b are housed together in a common case. In this case, if the drive shaft 32ba (see FIG. 2) protrudes from the common case and a flange 32bb is provided at its tip, the entire water pump 32 can be removed from its permanent installation position L1 used for cleaning and connected to the mixer drum 10. Furthermore, if the pipes 33 and 34 are connected to the pump 32a via a quick joint such as a coupler, they can be easily attached and detached to and from the pump 32a. The pump 32a may be detached from the integrated pump-motor water pump 32.

[0052] The drive shaft 32ba of the motor 32b and the input shaft 22c of the reducer 22 may be connected by, for example, a spline connection. In this case, for example, a spline shaft may be provided as a connecting portion (one connecting portion) at the tip of the drive shaft 32ba, and a connecting portion (the other connecting portion) having a spline hole may be provided at the tip of the input shaft 22c.

[0053] The water pump 32 may be permanently installed at a connection position L2 between the motor 32b and the mixer drum 10, that is, on the side of the input gear 22a opposite to the side connected to the drive motor 21. In other words, the connection position L2 may be set as the permanent installation position L1.

[0054] In this case, the drive shaft 32ba of the motor 32b and the input shaft 22c of the reducer 22 can be connected via a power transmission member 60 that is detachably provided between the flanges 32bb and 22ca, for example, and that enables power transmission between the flanges 32bb and 22ca, as shown in Fig. 4. In the example shown in Fig. 4, the flanges 32bb and 22ca are connected by bolting the flanges 32bb and 22ca to the power transmission member 60, which is a disk-shaped rotating member set between the flanges 32bb and 22ca.

[0055] As a result, by leaving the power transmission member 60 removed from between the flange 32bb and the flange 22ca under normal circumstances, the flange 32bb and the flange 22ca can be separated and separated. Therefore, even when the electromagnetic clutch 51 is normally engaged, the water pump 32 can be used for cleaning. In addition, in an emergency, by attaching the power transmission member 60 with bolts, the water pump 32 can be used to rotate the mixer drum 10.

[0056] At this time, the water discharged from the pump 32a can be returned to the water tank 31 by installing, for example, a shower head (not shown) in the water tank 31. Alternatively, if the rotation speed of the pump 32a is low when discharging ready-mixed concrete in an emergency, the amount of water discharged from the pump 32a will also be small, so if there is no particular problem, the water discharged from the pump 32a may be discharged directly into the surrounding area.

[0057] The power transmission member 60 may be provided as a spacer between the flange 32bb and the flange 22ca, in which case, by providing a bolt insertion hole in the spacer, the flange 32bb and the flange 22ca can be fastened with a bolt. The power transmission member 60 may also be a manual or electric clutch, and when the water pump 32 is permanently installed at the connection position L2, the motor 32b is detachably or disconnectably connected to the mixer drum 10 via the power transmission member 60 to rotate the mixer drum 10.

[0058] The configuration, operation, and effects of the embodiment of the present invention will be described below.

[0059] The mixer vehicle 100 includes a mixer drum 10 rotatably mounted on the vehicle, a water tank 31 that stores water used for cleaning, and a water pump 32 that has a pump 32a connected to the water tank 31 and a motor 32b that drives the pump 32a. The motor 32b is detachably or disconnectably connected to the mixer drum 10 and can rotate the mixer drum 10.

[0060] According to this configuration, in an emergency when the mixer drum 10 loses power from the drive motor 21, the mixer drum 10 can be rotated using the motor 32b of the water pump 32 that is permanently installed as standard equipment on the mixer truck 100, so that ready-mixed concrete can be discharged using a single vehicle without the need for an additional drive source.

[0061] A flange 32bb is provided on the drive shaft 32ba of the motor 32b as a coupling portion. The motor 32b is removed from the permanent installation position L1, where the motor 32b is connected to the pump 32a, and is connected to the mixer drum 10 via the flange 32bb.

[0062] According to this configuration, in an emergency, the motor 32b can be removed from the permanent installation position L1 and reconnected to the mixer drum 10 via the flange 32bb, so that the motor 32b of the water pump 32, which is normally used for cleaning, can be used as the drive source for the mixer drum 10 in an emergency, eliminating the need to add a new drive source.

[0063] The mixer vehicle 100 further includes a drive motor 21, which is a drive source that rotates and drives the mixer drum 10, a reducer 22 that has an input gear 22a to which the drive motor 21 is connected and that reduces the input rotation from the drive motor 21 and outputs it to the mixer drum 10, an electromagnetic clutch 51, which is an electric clutch that functions as a brake that restricts 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 and is released or cut off depending on whether or not electricity is applied, and an input shaft 22c, which is connected to the input gear 22a on the side opposite to the side to which the drive motor 21 is connected, passes through the electromagnetic clutch 51, and is a rotating shaft whose rotation is restricted by the electromagnetic clutch 51. A motor 32b is connected to the input shaft 22c via a flange 32bb, and is thereby connected to the input gear 22a.

[0064] With this configuration, the electromagnetic clutch 51 can prevent the mixer drum 10 from spinning freely when it is no longer driven by the drive motor 21. Furthermore, the motor 32b is connected to the input gear 22a of the reducer 22 by being coupled via a flange 32bb to the input shaft 22c that passes through the electromagnetic clutch 51, thereby making it possible to effectively use the space on the opposite side to the side where the drive motor 21 is connected. Furthermore, even if the motor 32b is connected in this manner, in an emergency, the mixer drum 10 can be rotated by the motor 32b by releasing the electromagnetic clutch 51, making it possible to discharge ready-mixed concrete.

[0065] 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]

[0066] 10···Mixer drum, 21···Drive motor, 22···Reduction gear, 22a···Input gear, 22c···Input shaft (rotating shaft), 31···Water tank, 32···Water pump, 32a···Pump, 32b···Motor, 32ba···Drive shaft, 32bb···Flange (connecting part), 51···Electromagnetic clutch (electric clutch), 100···Mixer car, L1···Permanent position

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 having a pump connected to the water tank and a motor for driving the pump; The motor is detachably or disconnectably connected to the mixer drum and can rotate the mixer drum. A mixer truck characterized by:

2. The mixer vehicle according to claim 1, a coupling portion is provided on the drive shaft of the motor; the motor is removed from a permanently installed position where the motor is connected to the pump and connected to the mixer drum via the coupling; A mixer truck characterized by:

3. The mixer vehicle according to claim 2, a drive source that rotates the mixer drum; a reducer having an input gear to which the drive source is connected, the reducer reducing the input rotation from the drive source and outputting the reduced rotation to the mixer drum; an electric clutch that functions as a brake that restricts rotation of the input gear from the side opposite to the side to which the drive source is connected, and that is released or cut off depending on whether or not electricity is being applied; a rotating shaft connected to the input gear on the side opposite to the side connected to the drive source, passing through the electric clutch and having its rotation restricted by the electric clutch; Furthermore, the motor is connected to the rotary shaft via the coupling portion, and thereby connected to the input gear; A mixer truck characterized by:

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