JP2003226192A - Truck mixer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a truck mixer capable of rotating a drum even while an engine is suspended. <P>SOLUTION: This truck mixer is provided with an electric generator 3 driven by the engine 1, a accumulator 6, which accumulates the electric power from the generator 3, an electric motor 8A driven by the electric power accumulated in the accumulator 6 and the drum 16 driven and rotated by the electric generator 8A. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixer vehicle,
More particularly, the present invention relates to a mixer drum drive system for an electric mixer vehicle that enables low noise, fuel saving, and emission reduction. 2. Description of the Related Art A conventional ready-mixed concrete mixer truck is shown in FIG.
As shown in (1), a mixer drum (hereinafter referred to as a drum) is rotationally driven by a hydraulic motor, and the hydraulic motor is rotated by hydraulic oil discharged from a hydraulic pump connected to an engine output shaft. Drum drive
In general, when putting ready-mixed concrete in a ready-mixed concrete plant, transporting to a construction site, waiting for ready-mixed concrete to be discharged at a construction site, kneading just before discharge, discharging,
Washing inside the drum, returning to the plant, and washing the car can be roughly classified, but all of them are based on the assumption that the engine is running. [0003] As described above, in the conventional ready-mixed concrete mixer vehicle, the engine must be operated when the drum is driven, so that the construction site is located near the residential area. Environmental problems such as engine noise at certain times, exhaust gas during tunnel construction, and exhaust gas and noise during idling operation due to signal waiting and traffic congestion have been pointed out greatly. Further, there is a large problem in terms of effective use of resources with respect to wasteful fuel consumption caused by a decrease in engine efficiency due to an increase in the engine speed in each operation such as engine idling, kneading, washing, and car washing. [0004] Further, when discharging the ready-mixed concrete by sufficiently lowering the rotation of the drum (for example, a discharging method in which a small amount of ready-mixed concrete is taken out and transported to a cat car), the swash plate tilt angle of the hydraulic pump is used. Discharge volume control
Due to the region extremely close to the stability limit or the region outside the region, it has been difficult to obtain a stable rotation of the drum by the conventional method. An object of the present invention is to solve such a problem. SUMMARY OF THE INVENTION The present invention provides a power generator driven by an engine, a power storage device for storing the output of the power generator, and a motor driven by the power stored in the power storage device. And the drum is rotated by the electric drive device. According to the present invention, a power generator driven by an engine, a power storage device storing the output of the power generator, and a motor driven by the power stored in the power storage device are provided. Since the drum can be rotated by the electric drive device and the electric drive device, the drum can be rotated with the engine stopped. FIG. 1 is a circuit diagram showing a configuration of an electric mixer car according to an embodiment of the present invention. An electric mixer vehicle according to an embodiment of the present invention includes an engine 1 and a generator 3 driven by the engine 1.
And a storage battery 6 for storing the output of the generator 3 or the power from a charger 17 placed in a plant facility, a motor 8A driven by the output of the storage battery 6, and a drum 16 rotated by the motor 8A. Have. The engine 1 is an automobile engine which is the main motive power of an electric mixer car, and a gasoline engine or a diesel engine is used. The driving force of the engine 1 is taken out through a power take-out shaft 2 and drives a generator 3. Electric power generated by the generator 3 is stored in the storage battery 6 via the automatic voltage regulator 4 and the switch 5. The automatic voltage regulator 4 is provided with an appropriate protection function for preventing a certain amount of power from being output to a subsequent stage. If the generator 3 is of an AC type, a rectifier for converting AC to DC is also added to the automatic voltage regulator 4, and if the generator 3 is of a DC type, no rectifier is required. The switch 5 is a means for selecting which of the electric power from the generator 3 and the electric power from the charger 17 installed in the ready-mixed concrete plant is sent to the storage battery 6 and the variable speed driver 7. The variable speed driver 7 is a power converter for driving the electric motor 8A at a variable speed in both forward and reverse directions. The electric motor 8 </ b> A receives electric power from the variable speed driver 7,
Rotate 6. The speed reducer 15 reduces the rotation speed of the electric motor 8A to an appropriate rotation speed, and rotates the drum 16. The drum 16 kneads and transports and discharges the stored ready-mixed concrete. The rotation direction and the number of rotations are controlled by the variable speed driver 7. Next, the operation of the first embodiment of the present invention will be described. During operation of the engine 1, the driving force of the engine 1 is transmitted to the generator 3 via the power take-off shaft 2, and
Drive. Electric power generated by the generator 3 is sent to the storage battery 6 and the variable speed driver 7 via the automatic voltage regulator 4 and the switch 5. The variable speed driver 7 is controlled by an operator's operation, receives power from the automatic voltage regulator 4 or the storage battery 6, and outputs power to drive the electric motor 8A in an appropriate rotation direction and rotation speed. When rotating the drum 16, the electric motor 8 </ b> A is driven by the electric power from the variable speed driver 7. The driving force of the electric motor 8A drives and rotates the drum 16 via the power transmission shaft 14 and the speed reducer 15. The electric power output from the generator 3 is a motor 8A
When the electric power is larger than the electric power required for driving the electric motor, the generator 3 simultaneously charges the storage battery 6 and drives the electric motor 8A, and when the electric power output from the electric generator 3 is smaller than the electric power necessary for driving the electric motor 8A. Supplies the insufficient power from the storage battery 6. While the engine 1 is stopped, the electric power stored in the storage battery 6 is sent to the electric motor 8A via the variable speed driver 7 to drive the electric motor 8A. The driving force of the motor 8A is
The drum 16 is driven and rotated via the power transmission shaft 14 and the speed reducer 15. When the engine 1 is started again, the electric power generated by the generator 3 is sent to the storage battery 6 and the variable speed driver 7 via the automatic voltage regulator 4 and the switch 5 to drive the electric motor 8A. The driving force of the electric motor 8A drives and rotates the drum 16 via the power transmission shaft 14 and the speed reducer 15. The power and electric power required for driving the drum 16 while the engine 1 is stopped vary depending on the working mode of the mixer truck, the shape and amount of the ready-mixed concrete, and the like. The capacity of the storage battery 6 is selected, and the amount of charge of the storage battery performed during operation of the engine 1 such as while the vehicle is running is set to a value that can supplement the amount of discharge of the storage battery accompanying the driving of the drum 16 performed while the engine 1 is stopped. Set the capacity. Since the actual operating condition of the mixer truck varies greatly depending on the distance between the construction site and the ready-mixed concrete plant, it is particularly difficult to calculate the required amount of storage battery charging, and in some cases, the charging may be insufficient. In such a case, the storage battery 6 can be charged from the charger 17 installed in the ready-mixed concrete plant via the switch 5. As described above, according to the embodiment of the present invention, in the stirring operation of the ready-mixed concrete in the drum while arriving at the construction site and waiting for the ready-mixed concrete to be discharged, even if the engine 1 is stopped, the storage battery Since the drum 16 can be driven using the electric power stored in the drum 6,
It is not necessary to always drive the engine when the drum is driven as in a conventional mixer vehicle, and it is possible to reduce engine noise and exhaust gas generated in a conventional mixer vehicle in which the engine cannot be stopped and to save fuel. In addition, the engine 1 can be idling-stopped while maintaining the rotation of the drum 16 even during traffic congestion or waiting for a traffic light, and the engine 1 can be stopped without stopping the drum 16.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a configuration of an electric mixer vehicle according to a first embodiment of the present invention. FIG. 2 is a circuit diagram showing a configuration of a conventional mixer car. [Description of Signs] 1 Engine 2 Power take-off shaft 3 Generator 4 Automatic voltage regulator 5 Switch 6 Battery 7 Variable speed driver 8A Electric motor 9A Main hydraulic pump 9B Auxiliary hydraulic pump 9C Pump control mechanisms 10A, 10B Check valves 11, 12A, 12B Relief valve 13 Hydraulic motor 14 Power transmission shaft 15 Reducer 16 Drum 17 Charger

Claims (1)

Claims: 1. A mixer vehicle having an engine for supplying power for driving a vehicle and a drum driven to rotate, a power generator driven by the engine, and an output of the power generator. A mixer car characterized by comprising: a power storage device that accumulates electric power; an electric drive device including a motor driven by electric power stored in the power storage device; and the drum driven by the electric drive device.