WO2017047298A1

WO2017047298A1 - Mixer vehicle

Info

Publication number: WO2017047298A1
Application number: PCT/JP2016/073610
Authority: WO
Inventors: 和徳田中; 茂川島; 清水　弘之
Original assignee: Ｋｙｂ株式会社
Priority date: 2015-09-17
Filing date: 2016-08-10
Publication date: 2017-03-23
Also published as: JP2017056849A; AU2016322237A1; JP6093823B1

Abstract

Provided is a mixer vehicle capable of preventing ready-mixed concrete from spilling out from an opening of a mixer drum when driving up an ascending slope. A vehicle body (10) includes a mount (13). A mixer drum (20) has an opening (27) that opens to the rear end, and is rotatably mounted on the mount (13) in a forward-tilted orientation. The mixer drum (20) includes a helical drum blade (25) fixed to the inner wall surface thereof, and when the mixer drum (20) is subjected to positive rotation, ready-mixed concrete introduced therein is moved forward by the drum blade (25). A rotating device (40) causes the mixer drum (20) to rotate. An angle acquisition device (50) acquires the inclination angle of the mount (13) in the front-to-rear direction. When the inclination angle acquired by the angle acquisition device (50) becomes greater than or equal to a predetermined angle in a state where the mount (13) is in a downwardly inclined state from the front end toward the rear, a control device (70) executes a sloping road control by which the rotating device (40) increases the rotation speed of the positive rotation of the mixer drum (20).

Description

Mixer truck

The present invention relates to a mixer truck.

Patent Document 1 discloses a conventional mixer truck. This mixer vehicle includes a vehicle body, a mixer drum, and a rotating device. The vehicle body has a mount. The mixer drum has an opening into which a ready-mixed concrete is introduced, opened at the rear end, and is rotatably mounted on the gantry of the vehicle body in a forward tilt posture. The mixer drum has two spiral drum blades fixed to the inner wall surface. When this mixer drum rotates forward, the ready mixed concrete is moved forward by the drum blade. The mixer drum has a seal pipe fixed inside the drum blade on the opening side. The rotating device rotates the mixer drum. In this mixer vehicle, the ready-mixed concrete can be agitated by rotating the mixer drum forward while preventing the ready-mixed concrete from overflowing from the opening of the mixer drum by the seal pipe.

JP-A-8-40136

However, even if it is a mixer truck of patent document 1, when ready mixed concrete of a specified weight is thrown into a mixer drum without considering the attitude of the mixer drum when traveling uphill, the ready mixed concrete has a low specific gravity. Since the volume with respect to the weight is large, the ready-mixed concrete may overflow from the opening of the mixer drum when traveling uphill.

The present invention has been made in view of the above-described conventional situation, and provides a mixer vehicle capable of suppressing overflow of ready-mixed concrete from an opening of a mixer drum when traveling uphill. This is a problem to be solved.

The mixer vehicle of the present invention includes a vehicle body, a mixer drum, a rotating device, an angle acquisition device, and a control device. The vehicle body has a mount. The mixer drum has an opening into which the ready-mixed concrete is thrown open at the rear end, and is rotatably mounted on the gantry in a tilted position. The mixer drum has a spiral drum blade fixed to the inner wall surface. When the mixer drum rotates forward, the ready-mixed concrete thrown in by the drum blade moves forward. The rotating device rotates the mixer drum. The angle acquisition device acquires the inclination angle of the gantry in the front-rear direction. The control device executes slope control that increases the rotational speed of the mixer drum in the normal rotation when the tilt angle acquired by the angle acquisition device is equal to or greater than a predetermined angle with the gantry tilted downward from the front end. To do.

The mixer vehicle rotation device of the present invention includes a hydraulic motor, a hydraulic pump, and a drive device. The hydraulic motor rotates the mixer drum. The hydraulic pump can change the amount of hydraulic oil supplied to and discharged from the hydraulic motor by changing the discharge capacity of the hydraulic oil. The drive device rotates the hydraulic pump.

The mixer vehicle rotating device of the present invention includes a hydraulic motor, a hydraulic pump, and a driving device. The hydraulic motor rotates the mixer drum. The hydraulic motor can change the rotational speed of the mixer drum by changing the discharge capacity of the hydraulic oil. The hydraulic pump supplies and discharges hydraulic oil to and from the hydraulic motor. The drive device rotates the hydraulic pump.

The control apparatus for a mixer truck according to the present invention executes slope control when the amount of ready-mixed concrete put into the mixer drum exceeds a predetermined amount.

The mixer vehicle angle acquisition device of the present invention includes a storage device that stores map information for determining the inclination angle of a road, and a position specifying device that specifies the traveling position of the mixer vehicle. The angle acquisition device acquires the tilt angle in the front-rear direction of the gantry from the map information stored in the storage device and the travel position specified by the position specifying device.

It is the schematic which shows the mixer truck of Embodiment 1 and 2. FIG. It is the schematic which shows the state which the mixer truck of Embodiment 1 and 2 drive | works an uphill. 1 is a system diagram of a mixer truck according to a first embodiment. 5 is a flowchart illustrating slope control for changing the discharge capacity of the hydraulic motor in the mixer vehicle of the first embodiment. It is a system diagram of the mixer truck of the second embodiment. It is a flowchart which shows slope control which changes the discharge capacity of a hydraulic pump in the mixer truck of Embodiment 2.

Embodiments 1 and 2 embodying the mixer truck of the present invention will be described with reference to the drawings.

<Embodiment 1>
As shown in FIGS. 1 and 2, the mixer truck of the first embodiment includes a vehicle body 10, a mixer drum 20, a hopper 30, a chute 35, a rotating device 40, an angle acquisition device 50, and a weight sensor. 60 and a control device 70. The vehicle body 10 includes a cabin 11, a gantry 13, and an engine 80. The cabin 11 is provided on the front side of the vehicle body 10. The gantry 13 is provided on the vehicle body 10 behind the cabin 11. The engine 80 is a drive device that drives the vehicle body 10 and rotates the hydraulic pump 43 as will be described later. The engine 80 is disposed below the cabin 11.

The mixer drum 20 includes a drum body 21, a drive shaft 23, and two drum blades 25. The drum body 21 is cylindrical. The drum body 21 has an opening 27 at the rear end. The drum body 21 has a front end closed by a closing portion 29. The mixer drum 20 rotates on the pedestal 13 in a forward tilt posture in which the opening 27 of the drum body 21 is positioned above the rear end of the vehicle body 10 and the opening 27 of the drum body 21 is lifted above the closing part 29. It is installed freely.

The drive shaft 23 is connected to the center of the closing portion 29 of the drum body 21 and extends outward from the drum body 21. The drive shaft 23 extends on the center line of the rotation shaft of the mixer drum 20. Each drum blade 25 is helically fixed along the inner wall surface of the drum body 21 with a predetermined interval. Each drum blade 25 rotates with the drum body 21.

The hopper 30 has an input port 31 that opens while spreading upward. The hopper 30 has a discharge port 33 having a lower end opened forward and downward. The hopper 30 has a discharge port 33 facing the center of the opening 27 of the drum body 21. The ready-mixed concrete that is input from the input port 31 of the hopper 30 is input into the drum body 21 through the discharge port 33 of the hopper 30.

The chute 35 has a semi-cylindrical shape and extends long with the inner surface facing upward. The base end of the chute 35 is disposed below the opening 27 of the drum body 21. The chute 35 is supported so that its distal end is rotatable in the horizontal and vertical directions with the base end as the center. The chute 35 can guide the ready mixed concrete discharged from the opening 27 of the drum body 21 to a desired position.

As shown in FIGS. 1 to 3, the rotating device 40 has a hydraulic motor 41, a hydraulic pump 43, and an engine 80 as a driving device. The hydraulic motor 41 is mounted on the mount 13. The hydraulic motor 41 is connected to the drive shaft 23 of the mixer drum 20 via the speed reducer 37. The hydraulic pump 43 is also mounted on the mount 13. The hydraulic pump 43 is connected to a power take-out shaft 81 of the engine 80. The hydraulic pump 43 is a two-speed type that can switch the discharge capacity of the hydraulic oil in two stages of large and small. The hydraulic pump 43 has a regulator 43A for switching the discharge capacity.

The hydraulic pump 43 and the hydraulic motor 41 each have two inflow and outflow ports (ports) for hydraulic oil. A hydraulic circuit that forms a closed circuit is configured by a flow path 45 that communicates the inflow and outflow ports of the hydraulic pump 43 and the hydraulic motor 41. The hydraulic circuit can circulate the hydraulic oil in both directions by switching the hydraulic oil supply / discharge direction of the hydraulic pump 43 and the hydraulic motor 41. That is, when the hydraulic oil is circulated in one direction of the hydraulic circuit, the drum body 21 rotates forward and the ready-mixed concrete is stirred while moving forward in the drum body 21. When hydraulic oil is circulated in multiple directions of the hydraulic circuit, the drum body 21 rotates in the reverse direction, and the ready-mixed concrete moves backward in the drum body 21 and is discharged from the opening 27.

In this mixer vehicle, the property of the ready-mixed concrete put into the drum body 21 is normal when the running road is not a steep uphill, that is, when the control device 70 is not executing slope control described later. In order not to change, the mixer drum 20 is agitated by rotating it forward at a slow rotational speed. For this reason, this mixer car supplies and discharges hydraulic oil to and from the hydraulic motor 41 in a state in which the hydraulic oil discharge capacity of the hydraulic pump 43 is switched to a small value during normal traveling.

The angle acquisition device 50 is mounted on the gantry 13 as shown in FIGS. 1 and 2. This angle acquisition device 50 is a digital inclinometer. This angle acquisition device 50 can acquire the inclination angle in the front-rear direction of the mixer 13.

The weight sensor 60 is provided between the drum body 21 and a frame 15 that rotatably supports the drum body 21. The weight sensor 60 can detect the weight change of the ready-mixed concrete when the ready-mixed concrete is put into the drum body 21 and can detect the weight of the ready-mixed concrete.

The control device 70 is mounted on the gantry 13. The control device 70 starts control of the hydraulic pump 43 when the engine 80 is driven and the hydraulic pump 43 rotates so that the mixer drum 20 rotates forward. When the control device 70 starts control, as shown in FIG. 4, first, the weight (input amount) of the ready-mixed concrete input to the drum body 21 detected by the weight sensor 60 is equal to or greater than a predetermined weight (V). It is determined whether or not there is (step S1). The predetermined weight is a weight calculated from the maximum volume of the ready-mixed concrete that does not overflow from the opening 27 of the drum body 21 even when traveling on a steep uphill, and is determined by the size of the drum body 21. Is done. If the weight (input amount) of the ready-mixed concrete detected by the weight sensor 60 is lighter (smaller in volume) than the predetermined weight (V), the mixer vehicle is capable of moving the drum body 21 even when traveling on a steep uphill. The ready mixed concrete does not overflow from the opening 27. For this reason, the control device 70 does not execute the slope control described later, and the state in which the discharge capacity of the hydraulic pump 43 is switched to a small value (the tilt of the hydraulic pump 43 so as to reduce the discharge capacity) as in the normal travel. In a state where the angular position is changed), hydraulic oil is supplied to and discharged from the hydraulic motor 41 (step S5). For this reason, in this mixer truck, the mixer drum 20 rotates forward at a slow rotational speed (step S6) and travels while stirring the ready-mixed concrete. The control device 70 returns from step S6 to step S1, and continues to control the hydraulic pump 43 until the engine 80 stops and the rotation of the hydraulic pump 43 stops.

In addition, the control device 70 is in a state where the frame 13 of the mixer truck is inclined downward from the front end toward the rear when the weight (input amount) of the ready-mixed concrete detected by the weight sensor 60 is equal to or greater than a predetermined weight (V). In step S2, it is determined whether the inclination angle acquired by the angle acquisition device 50 is equal to or greater than a predetermined angle (A). This predetermined angle is the maximum inclination angle of the gantry 13 in a range where the drum body 21 into which the ready-mixed concrete having a predetermined weight (V) is thrown back and the ready-mixed concrete does not overflow from the opening 27, It is determined by the size and shape of the drum body 21. Since the ready-mixed concrete does not overflow from the opening 27 of the drum body 21 when the inclination angle acquired by the angle acquisition device 50 is during normal traveling smaller than the predetermined angle (A), the discharge capacity of the hydraulic pump 43 The hydraulic oil is supplied to and discharged from the hydraulic motor 41 in a state in which is switched to small (step S5). For this reason, in this mixer truck, the mixer drum 20 rotates forward at a slow rotational speed (step S6) and travels while stirring the ready-mixed concrete.

Further, when the inclination angle acquired by the angle acquisition device 50 is equal to or greater than the predetermined angle (A), the control device 70 switches the discharge capacity of the hydraulic pump 43 to a large level and executes slope control (step S3). That is, the tilt angle position of the hydraulic pump 43 is changed so that the discharge capacity of the hydraulic pump 43 increases. When the protruding capacity of the hydraulic pump 43 is increased, the hydraulic oil supplied to and discharged from the hydraulic motor 41 increases, and the rotational speed of the hydraulic motor 41 increases. That is, the forward rotation speed of the mixer drum 20 is increased (step S4). The control device 70 returns from step S4 to step S1, and continues to control the hydraulic pump 43 until the engine 80 stops and the rotation of the hydraulic pump 43 stops.

As described above, the mixer truck according to the first embodiment includes the vehicle body 10, the mixer drum 20, the rotation device 40, the angle acquisition device 50, and the control device 70. The vehicle body 10 has a mount 13. The mixer drum 20 has an opening portion 27 into which ready-mixed concrete is introduced at the rear end of the drum body 21, and is rotatably mounted on the gantry 13 in a forward inclined posture. The mixer drum 20 has a spiral drum blade 25 fixed to the inner wall surface of the drum main body 21. When the drum drum 20 rotates forward, the ready-mixed concrete thrown in by the drum blade 25 moves forward. The rotating device 40 rotates the mixer drum 20. The angle acquisition device 50 acquires the inclination angle of the gantry 13 in the front-rear direction. When the inclination angle acquired by the angle acquisition device 50 is equal to or greater than a predetermined angle (A) while the gantry 13 is inclined downward from the front end toward the rear, the control device 70 causes the rotation device 40 to rotate the mixer drum 20 in the normal direction. Execute slope control to increase the speed.

When this mixer car travels uphill, the gantry 13 is inclined downward from the front end toward the rear. At this time, if the inclination angle acquired by the angle acquisition device 50 is equal to or greater than the predetermined angle (A), the mixer vehicle increases the rotational speed of the mixer drum 20 in the normal rotation. That is, when this mixer car travels on a steep uphill, the rotational speed of the forward rotation of the mixer drum 20 increases, and therefore the force to move the ready-mixed concrete in the drum body 21 of the mixer drum 20 in the forward direction becomes strong. It is possible to suppress the ready-mixed concrete from being agitated in the drum body 21 so as to be separated from the opening 27 and overflowing from the opening 27.

Therefore, when the mixer truck of the first embodiment travels uphill, the ready-mixed concrete can be prevented from overflowing from the opening 27 of the mixer drum 20.

Further, the rotating device 40 of the mixer truck according to the first embodiment includes a hydraulic motor 41, a hydraulic pump 43, and an engine 80 that is a driving device. The hydraulic motor 41 rotates the mixer drum 20. The hydraulic pump 43 is a two-speed type that can switch the discharge capacity of the hydraulic oil in two stages, large and small, and switches the amount of hydraulic oil supplied to and discharged from the hydraulic motor 41 in two stages. The engine 80 rotates the hydraulic pump 43. For this reason, when the mixer vehicle travels uphill, the gantry 13 is inclined downward from the front end toward the rear, and the inclination angle acquired by the angle acquisition device 50 is equal to or greater than a predetermined angle (A). By switching the discharge capacity of the hydraulic pump 43 to a large value, the rotation speed of the mixer drum 20 can be increased. In this way, the mixer vehicle can increase the rotational speed of the normal rotation of the mixer drum 20 without increasing the output of the engine 80, and when the vehicle runs on an uphill, it is ready from the opening 27 of the mixer drum 20. It is possible to suppress the overflow of concrete.

Further, the control device 70 for the mixer truck according to the first embodiment executes slope control when the amount of ready-mixed concrete put into the drum body 21 exceeds a predetermined weight (V). In this way, in this mixer vehicle, the controller 70 controls the slope only when ready-mixed concrete having a weight that may overflow from the opening 27 of the mixer drum 20 is thrown into the drum body 21 when traveling on the uphill. Is executed. For this reason, this mixer truck can prevent agitation of ready-mixed concrete more than necessary, and can reduce the property change of ready-mixed concrete.

<Embodiment 2>
In the mixer truck of the second embodiment, as shown in FIGS. 5 and 6, the rotation device 140 can switch the hydraulic oil discharge capacity of the hydraulic oil 143 that does not change and the hydraulic oil discharge capacity in two stages of large and small. The point of having a high speed hydraulic motor 141 and a regulator 141A for switching the discharge capacity of the hydraulic motor 141 and the point that the control device 170 controls the hydraulic motor 141 are different from the first embodiment. Other configurations are the same as those of the first embodiment, and the same configurations as those of the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

This mixer car has a property of ready-mixed concrete put into the drum body 21 during normal driving where the road on which the vehicle is traveling is not a steep uphill, that is, when the control device 170 is not executing slope control described later. In order not to change, the mixer drum 20 is agitated by rotating it forward at a slow rotational speed. For this reason, the mixer vehicle is in a state where the discharge capacity of the hydraulic oil of the hydraulic motor 141 is switched to a large value during normal traveling.

This control device 170 starts control of the hydraulic motor 141 when the engine 80 is driven so that the mixer drum 20 rotates in the forward direction, the hydraulic pump 143 rotates, and hydraulic oil is supplied to and discharged from the hydraulic motor 141. When the control device 170 starts control, as shown in FIG. 6, first, the weight (input amount) of the ready-mixed concrete input to the drum body 21 detected by the weight sensor 60 is not less than a predetermined weight (V). It is determined whether or not there is (step S11). The predetermined weight is a weight calculated from the maximum volume of the ready-mixed concrete that does not overflow from the opening 27 of the drum body 21 even when traveling on a steep uphill, and is determined by the size of the drum body 21. Is done. If the weight (input amount) of the ready-mixed concrete detected by the weight sensor 60 is lighter (smaller in volume) than the predetermined weight (V), the mixer vehicle is capable of moving the drum body 21 even when traveling on a steep uphill. The ready mixed concrete does not overflow from the opening 27. For this reason, the control device 170 does not execute slope control, which will be described later, and is in a state in which the discharge capacity of the hydraulic motor 141 is switched to a large value (as in normal driving) A state in which the angular position is changed) (step S15). For this reason, in this mixer truck, the mixer drum 20 rotates forward at a slow rotational speed (step S16) and travels while stirring the ready-mixed concrete. Control device 170 returns from step S16 to step S11, and continues control of hydraulic motor 141 until engine 80 stops and rotation of hydraulic motor 141 stops.

Further, when the weight (input amount) of the ready-mixed concrete detected by the weight sensor 60 is equal to or more than a predetermined weight (V), the control device 170 is in a state in which the mixer 13 is tilted downward from the front end toward the rear. In step S12, it is determined whether the inclination angle acquired by the angle acquisition device 50 is equal to or greater than a predetermined angle (A). This predetermined angle is the maximum inclination angle of the gantry 13 in a range where the drum body 21 into which the ready-mixed concrete having a predetermined weight (V) is thrown back and the ready-mixed concrete does not overflow from the opening 27, It is determined by the size and shape of the drum body 21. Since the ready-mixed concrete does not overflow from the opening 27 of the drum body 21 when the inclination angle acquired by the angle acquisition device 50 is during normal traveling smaller than the predetermined angle (A), the discharge capacity of the hydraulic motor 141 is not increased. Is switched to a large state (step S15). For this reason, in this mixer truck, the mixer drum 20 rotates forward at a slow rotational speed (step S16) and travels while stirring the ready-mixed concrete.

Further, when the inclination angle acquired by the angle acquisition device 50 is equal to or greater than the predetermined angle (A), the control device 170 switches the discharge capacity of the hydraulic motor 141 to a small value and executes slope control (step S13). That is, the tilt angle position of the hydraulic motor 141 is changed so that the discharge capacity of the hydraulic motor 141 is reduced. When the protruding capacity of the hydraulic motor 141 is reduced, the hydraulic motor 141 rotates with a small amount of hydraulic oil supplied and discharged, so that the rotational speed of the hydraulic motor 141 increases. That is, the forward rotation speed of the mixer drum 20 is increased (step S14). The control device 170 returns from step S14 to step S11, and continues to control the hydraulic pump 143 until the engine 80 stops and the rotation of the hydraulic pump 143 stops.

As described above, when the inclination angle acquired by the angle acquisition device 50 in the state in which the gantry 13 is inclined downward from the front end toward the rear is also greater than or equal to the predetermined angle, the control device 170 for the mixer vehicle of the second embodiment also rotates the rotation device 140. Executes the slope control for increasing the forward rotation speed of the mixer drum 20. For this reason, this mixer car also has a strong force to move the ready-mixed concrete in the drum body 21 of the mixer drum 20 in the forward direction because the rotational speed of the forward rotation of the mixer drum 20 increases when traveling on a steep uphill. Thus, the ready-mixed concrete can be prevented from overflowing from the opening 27 by being stirred in the drum body 21 so as to be separated from the opening 27.

Therefore, the ready-mixed concrete can be prevented from overflowing from the opening 27 of the mixer drum 20 when the mixer vehicle of the second embodiment also travels uphill.

Further, the rotating apparatus 140 for the mixer vehicle according to the second embodiment is a two-speed type in which the hydraulic motor 141 can switch the discharge capacity of the hydraulic oil in two stages of large and small, and the rotational speed of the mixer drum 20 can be changed. For this reason, when the mixer 13 travels uphill, the pedestal 13 is inclined downward from the front end toward the rear, and when the inclination angle acquired by the angle acquisition device 50 is equal to or greater than a predetermined angle, the hydraulic motor By switching the discharge capacity of 141 to a small value, the rotation speed of the mixer drum 20 can be increased. In this way, the mixer vehicle can increase the forward rotation speed of the mixer drum 20 without increasing the amount of hydraulic oil supplied to and discharged from the hydraulic motor 141 by the hydraulic pump 143. The ready mixed concrete can be prevented from overflowing from the opening 27 of the mixer drum 20.

The present invention is not limited to Embodiments 1 and 2 described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In Embodiments 1 and 2, the angle acquisition device is a digital inclinometer, but the angle acquisition device is a storage device that stores map information, and a position specifying device that specifies the traveling position of the mixer vehicle (for example, A global positioning system (GPS)), and the tilt angle in the front-rear direction of the gantry may be acquired from the map information and the travel position. That is, the traveling direction is grasped from the traveling position identified by the position identifying device, and the road on which the mixer vehicle travels based on the map information stored in the storage device, and the altitude data (data) along the direction in which the mixer vehicle on the road travels. ) To determine whether the road on which the mixer vehicle is traveling is uphill or downhill, and the inclination angle may be acquired. Or you may memorize | store and use the map information which has the inclination angle of a road as data directly in a memory | storage device. In this case, since the inclination angle of the mixer truck base is equal to the inclination angle of the road on which the mixer truck travels, the inclination angle of the mixer truck base can be acquired, and the slope control can be executed accurately. Therefore, this mixer truck can suppress the ready-mixed concrete from overflowing from the opening of the mixer drum when traveling uphill.
(2) In Embodiments 1 and 2, the weight sensor is provided to grasp the amount of ready-mixed concrete by weight. However, the sensor for measuring the volume of ready-mixed concrete in the drum body is provided to measure the amount of ready-mixed concrete by volume You may grasp.
(3) In the first and second embodiments, the mixer vehicle is equipped with a weight sensor to grasp the amount of ready-mixed concrete put into the drum body. You do not have to prepare for the car. In this case, the amount (weight or volume) of the ready-mixed concrete measured on the equipment side when the ready-mixed concrete is put into the drum body may be input to the control device and used.
(4) In the first and second embodiments, the rotating device has a two-speed hydraulic pump or hydraulic motor that can switch the discharge capacity in two stages of large and small, but the discharge capacity can be changed continuously. A possible hydraulic pump or hydraulic motor may be used. In this case, the control device may continuously change the discharge capacity of the hydraulic pump or hydraulic motor according to the amount of ready-mixed concrete input and the inclination angle of the gantry.
(5) In Embodiments 1 and 2, the rotating device that rotates the mixer drum is configured by a hydraulic device having a hydraulic motor and a hydraulic pump. However, the mixer drum may be rotated electrically.
(6) In Embodiments 1 and 2, the driving device that rotates the hydraulic pump is the engine that travels the vehicle body, but the hydraulic pump may be rotated by an engine or an electric motor that is different from the engine that travels the vehicle body. . In this case, the mixer drum can be rotated by rotating the hydraulic pump even when the engine is stopped.
(7) In Embodiments 1 and 2, the mixer drum rotation speed was increased by increasing the discharge capacity of the hydraulic pump or decreasing the discharge capacity of the hydraulic motor. To increase the rotational speed of the mixer drum.

DESCRIPTION OF SYMBOLS 10 ... Vehicle body, 13 ... Mount, 20 ... Mixer drum, 25 ... Drum blade, 27 ... Opening, 40 ... Rotating device, 41, 141 ... Hydraulic motor, 43, 143 ... Hydraulic pump, 50 ... Angle acquisition device, 70, 170 ... Control device, 80 ... Engine (drive device)

Claims

A vehicle body having a mount;
An opening into which ready-mixed concrete is thrown opens at the rear end, is rotatably mounted on the gantry in a forward-tilting posture, and has a spiral drum blade fixed to the inner wall surface. A mixer drum in which the ready-mixed concrete thrown into the interior by the drum blade moves forward;
A rotating device for rotating the mixer drum;
An angle acquisition device for acquiring an inclination angle of the gantry in the front-rear direction;
When the gantry tilts downward from the front end toward the rear, and the tilt angle acquired by the angle acquisition device is equal to or greater than a predetermined angle, the rotator executes slope control to increase the rotational speed of the mixer drum in the normal rotation. A control device,
A mixer vehicle characterized by comprising:
The rotating device includes a hydraulic motor that rotationally drives the mixer drum, a hydraulic pump that changes a discharge capacity of hydraulic oil and changes an amount of hydraulic oil supplied to and discharged from the hydraulic motor, and a driving device that rotates the hydraulic pump. The mixer vehicle according to claim 1, further comprising:
The rotating device rotationally drives the mixer drum, changes a hydraulic oil discharge capacity to change the rotational speed of the mixer drum, a hydraulic pump that supplies and discharges hydraulic oil to and from the hydraulic motor, and the hydraulic pump The mixer vehicle according to claim 1, further comprising a drive device that rotates the vehicle.
The said control apparatus performs the said slope control, when the quantity of the ready-mixed concrete thrown in in the said mixer drum exceeds predetermined amount, The said slope control is performed. Mixer car.
The angle acquisition device includes a storage device that stores map information in which the inclination angle of a road is known, and a position specifying device that specifies a travel position, and the map information and the travel position indicate the front-rear direction of the gantry. The mixer vehicle according to any one of claims 1 to 3, wherein an inclination angle is acquired.