JP2010228505A - Mixer drum driving control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mixer drum driving control device capable of reducing manufacturing cost in a concrete mixer truck. <P>SOLUTION: This mixer drum driving control device has a traveling engine 3 as a power source of a mixer drum 2, a hydraulic pump 5 and a hydraulic motor 6 variable in capacity for reciprocally rotating and accelerating-decelerating the mixer drum 2 based on power of the traveling engine 3, a controller 10 for controlling operation of the hydraulic pump 5 and the hydraulic motor 6 so that the mixer drum 2 becomes a target rotation state in response to a rotating speed of the traveling engine 3, a transmission mechanism 8 for transmitting rotation of the traveling engine 3 to the hydraulic pump 5, and a rotating speed signal output means 36 for outputting a rotating speed signal to the controller 10 in response to rotation of a rotary part of the transmission mechanism 8. The controller 10 arithmetically operates the rotating speed of the traveling engine 3 based on the rotating speed signal output from the rotating speed signal output means 36. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a mixer drum drive control device that drives and controls a mixer drum mounted on a mixer vehicle.

  A conventional mixer vehicle is known that includes a mixer controller that automatically controls the operation of a mixer drum drive system (see, for example, Patent Document 1).

  In a conventional mixer vehicle, the rotational speed of a traveling engine is input from an engine control device to a mixer controller, and the mixer controller is configured to be a hydraulic pump so that the mixer drum is in a target rotational state according to the input engine rotational speed. And the operation of the hydraulic motor.

  A connector for taking out the engine speed signal is arranged in the cab, and this connector and a mixer controller arranged in the cab are connected via a harness.

JP 2002-187477 A

  However, the voltage value of the engine speed signal varies depending on the type of the vehicle, and the connector for extracting the engine speed signal also differs in shape and extraction position in the vehicle depending on the type of vehicle.

  Therefore, in the assembly process for attaching the mixer drum unit including the mixer controller to the vehicle, the connection work between the connector for taking out the engine speed signal and the mixer controller differs depending on the type of the vehicle. Moreover, it is necessary to prepare a dedicated harness for connecting the connector and the mixer controller according to the type of the connector. As described above, since the connection work between the connector for taking out the engine speed signal and the mixer controller is not a unified work, the work man-hours increase and the manufacturing cost increases.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a mixer drum drive control device that can reduce the manufacturing cost of a mixer truck.

  The present invention is a mixer drum drive control device for driving and controlling a mixer drum mounted on a mixer vehicle, wherein the traveling drum as a power source of the mixer drum, and the mixer drum is rotated forward and backward based on the power of the traveling engine. And a hydraulic pump and a hydraulic motor with variable capacity for acceleration / deceleration, and a controller for controlling the operation of the hydraulic pump and the hydraulic motor so that the mixer drum is in a target rotational state according to the rotational speed of the traveling engine. A transmission mechanism for transmitting the rotation of the traveling engine to the hydraulic pump; and a rotation speed signal output means for outputting a rotation speed signal to the controller in accordance with the rotation of the rotating portion of the transmission mechanism, Is based on the rotational speed signal output from the rotational speed signal output means. Characterized by calculating the rotational speed.

  The present invention calculates the rotational speed of the traveling engine based on the rotational speed signal output to the controller along with the rotation of the transmission mechanism that transmits the rotation of the traveling engine to the hydraulic pump. That is, the rotational speed of the traveling engine is calculated by the controller based on the rotational speed signal output from the mixer drum unit, and is not input from the vehicle side to the controller. Therefore, according to the present invention, in the assembling process for attaching the mixer drum unit to the vehicle, the connection work between the controller of the mixer drum unit and the equipment on the vehicle side is reduced, so that the manufacturing cost of the mixer truck can be reduced.

1 is a plan view of a mixer truck equipped with a mixer drum drive control device according to an embodiment of the present invention. It is a fragmentary top view of the mixer truck in which the mixer drum drive control apparatus which concerns on embodiment of this invention is mounted. 1 is a partial side view of a mixer vehicle equipped with a mixer drum drive control device according to an embodiment of the present invention. It is a principal part perspective view of the mixer vehicle by which the mixer drum drive control apparatus which concerns on embodiment of this invention is mounted. It is a system configuration figure of a mixer drum drive control device concerning an embodiment of the invention. 1 is a partial side view of a mixer vehicle equipped with a mixer drum drive control device according to an embodiment of the present invention. It is a fragmentary top view of the mixer truck in which the mixer drum drive control apparatus which concerns on embodiment of this invention is mounted. 1 is a partial front view of a mixer vehicle equipped with a mixer drum drive control device according to an embodiment of the present invention.

  Hereinafter, a mixer drum drive control device 20 according to an embodiment of the present invention and a mixer vehicle 100 in which the mixer drum drive control device 20 is mounted will be described with reference to the drawings.

  The mixer vehicle 100 transports mortar, ready-mixed concrete or the like (hereinafter referred to as “raw concrete”) on a mixer drum (hereinafter referred to as “drum”) 2 mounted on the gantry 1.

  First, an overall configuration of the mixer truck 100 will be described mainly with reference to FIG.

  The drum 2 is rotatably mounted on the gantry 1 and is driven by a traveling engine 3 (see FIG. 5) mounted on the mixer vehicle 100 as a power source, and is connected to the variable displacement hydraulic pump 5 and the variable displacement hydraulic motor 6. Forward / reverse and increase / decrease. Hereinafter, the variable displacement hydraulic pump and the variable displacement hydraulic motor are referred to as “hydraulic pump” and “hydraulic motor”, respectively.

  The rotational movement of the crankshaft of the engine 3 is transmitted to the hydraulic pump 5 via the transmission mechanism 8 (see FIGS. 5 and 6). The transmission mechanism 8 includes a power take-out mechanism 9 (see FIGS. 5 and 6) for constantly taking power from the engine 3, and a drive shaft 4 (see FIGS. 4 to 7) that connects the power take-out mechanism 9 and the hydraulic pump 5. ). The power take-out mechanism 9 always takes out the power of the engine 3 through the flywheel. In this way, the hydraulic pump 5 is rotationally driven by the power that is always extracted from the engine 3 through the power extraction mechanism 9 and the drive shaft 4.

  The hydraulic oil discharged from the hydraulic pump 5 is supplied to the hydraulic motor 6, and the hydraulic motor 6 rotates. The drum 2 is connected to the hydraulic motor 6 via the speed reducer 7, and the drum 2 rotates as the hydraulic motor 6 rotates.

  Since the hydraulic pump 5 is rotationally driven by the power always taken out from the engine 3, the rotational speed of the hydraulic pump 5 is greatly influenced by the rotational speed of the engine 3 that varies depending on the traveling state of the vehicle. Therefore, the mixer vehicle 100 includes a mixer drum controller (hereinafter simply referred to as “controller”) that controls the operation of the hydraulic pump 5 and the hydraulic motor 6 so that the drum 2 is in a target rotational state in accordance with the rotational speed of the engine 3. .) 10 (see FIGS. 2 to 5) is mounted.

  The engine 3, the hydraulic pump 5, the hydraulic motor 6, and the controller 10 constitute a mixer drum drive control device 20 that drives and controls the drum 2.

  The hydraulic pump 5 is a swash plate type axial piston pump with a variable capacity, receives a command signal from the controller 10 and switches the tilt angle of the pump to the forward rotation direction or the reverse rotation direction, and adjusts the tilt angle. And a discharge direction and a discharge capacity are adjusted by the solenoid valve. When the drum 2 is rotated in the forward direction by the hydraulic pump 5, the raw control in the drum 2 is agitated, and when the drum 2 is operated in the reverse rotation, the raw control in the drum 2 is discharged to the outside.

  The hydraulic motor 6 is a swash plate type axial piston pump having a variable capacity. The hydraulic motor 6 is rotationally driven in response to supply of hydraulic oil discharged from the hydraulic pump 5. The hydraulic motor 6 includes an electromagnetic valve that receives a command signal from the controller 10 and adjusts the tilt angle of the motor, and is divided into two stages, a small capacity for high speed rotation and a large capacity for normal rotation. The capacity is switched.

  The hydraulic pump 5 and the hydraulic motor 6 are mounted on the gantry 1 of the mixer truck 100, and the controller 10 is also mounted on the gantry 1. As described above, the controller 10 together with the drum 2, the hydraulic pump 5, and the hydraulic motor 6 constitutes a body mounted on the gantry 1.

  Hereinafter, the mounting position of the controller 10 will be described in detail with reference to FIGS.

  The mixer vehicle 100 performs wireless communication with the management center of the raw plant, and a radio (not shown) for performing wireless communication with the management center is mounted in the cab 11. Therefore, when the controller 10 is disposed in the cab 11, the controller 10 is affected by radio noise of radio communication. However, as shown in FIGS. 2 and 3, in the mixer vehicle 100, the controller 10 is mounted not on the cab 11 but on the gantry 1, so that it is not affected by the radio device mounted in the cab 11. .

  As shown in FIG. 4, a pair of main frames 15 a and 15 b extending in the traveling direction of the vehicle are arranged on the gantry 1 of the mixer vehicle 100 in parallel. On the main frames 15a and 15b, a front frame 16 and a rear frame (not shown) for supporting the front part and the rear part of the drum 2 so as to be rotatable are arranged upright.

  A hydraulic motor 6 and a speed reducer 7 are fixedly disposed on the front frame 16. A pump bracket 17 is disposed on the front side of the front frame 16 over a pair of main frames 15 a and 15 b, and the hydraulic pump 5 is disposed on the pump bracket 17 via a pump stay 19.

  The controller 10 is fixedly disposed on the side surface 16 a of the front frame 16 via a support base 14. As described above, the controller 10 is fixed to the front frame 16. Since the front frame 16 supports the load of the drum 2, it has high rigidity and is difficult to vibrate. Therefore, the front frame 16 is suitable as a place where the controller 10 is weak against vibration and impact. Since the controller 10 is mounted on the gantry 1 and exposed to wind and rain, it is accommodated in a waterproof box.

  Since the controller 10 is fixed to the front frame 16, the controller 10 is mounted on the frame 1 such as the drum 2, the hydraulic pump 5, the hydraulic motor 6, the main frames 15 a and 15 b, the front frame 16, and the rear frame. And the mixer drum unit. Therefore, the controller 10 can be manufactured as a unit in the process of manufacturing the mixer drum unit.

  In a conventional mixer vehicle in which the controller 10 is disposed in the cab 11, an operation for mounting the controller 10 in the cab 11 of the vehicle is required in an assembly process for mounting the mixer drum unit to the vehicle. In addition, since the mounting position of the controller 10 in the cab 11 differs depending on the vehicle type, it is necessary to prepare a dedicated stay for mounting the controller for each vehicle type. However, in the mixer vehicle 100, since the controller 10 is one of the constituent members of the mixer drum unit and is mounted on the gantry 1, in the assembling process for attaching the mixer drum unit to the vehicle, the work of attaching the controller 10 to the vehicle becomes unnecessary, and It is not necessary to prepare a dedicated stay for attaching the controller 10 for each vehicle type.

  Next, the mixer drum drive control device 20 will be described with reference to FIG.

  As shown in FIG. 5, a main battery 23 mounted on the mixer vehicle 100 is connected to the controller 10. The controller 10 is provided with a power supply relay 21. When the power supply relay 21 operates and is turned on, a current is supplied from the main battery 23 to the controller 10 to drive the controller 10.

  The power supply relay 21 operates and is turned on when the output voltage of the power generation device 22 that generates power with the rotation of the drive shaft 4 is applied. Since the drive shaft 4 rotates as the engine 3 starts, the controller 10 can control the drum 2 while the engine 3 is running. The power generator 22 will be described in detail later.

  In the cab 11, a parking brake 31, an operating device 32 for operating the drum 2, a travel engine controller 33 for controlling the engine 3, and the like are arranged.

  The parking brake 31 is provided with a detector that detects the lever position of the parking brake 31. When the parking brake 31 is applied, a stop signal is output from the detector to the controller 10.

  The operation device 32 includes a knob-type operation switch 32a for switching the rotation direction and the number of rotations of the drum 2, a stop switch 32b for emergency stop of the rotation of the drum 2, and automatically rotating the drum 2 with stirring. And an automatic agitation switch 32c. A command signal is output from the operating device 32 to the controller 10 based on the driver operating the switches 32a, 32b, and 32c. Based on the command signal, the controller 10 determines a target rotation state of the drum 2, specifically, a rotation direction and a rotation speed.

  A throttle adjustment signal is output from the controller 10 to the traveling engine controller 33 in accordance with the target rotation state of the drum 2. The travel engine controller 33 to which the throttle adjustment signal is input adjusts the throttle opening of the engine 3 based on the throttle adjustment signal. Further, a vehicle speed signal of the vehicle is input from the travel engine controller 33 to the controller 10.

  The engine 3 is connected to the hydraulic pump 5 via a transmission mechanism 8 including a power take-out mechanism 9 and a drive shaft 4. Along with the rotation of the rotating part of the transmission mechanism 8, a rotation speed signal indicating the rotation speed of the rotating part is output from the magnetic sensor 46 to the controller 10. The rotational speed signal output mechanism 36 as rotational speed signal output means for outputting the rotational speed signal to the controller 10 using the magnetic sensor 46 will be described in detail later.

  Since the transmission mechanism 8 is connected to the engine 3, the rotational speed of the rotating portion of the transmission mechanism 8 matches the rotational speed of the engine 3. Therefore, the controller 10 can calculate the rotational speed of the engine 3 based on the rotational speed signal input from the magnetic sensor 46.

  The controller 10 controls the operation of the hydraulic pump 5 and the hydraulic motor 6 so that the rotation direction and the rotation speed of the drum 2 are in the target rotation state according to the calculated rotation speed of the engine 3. Specifically, the controller 10 calculates the discharge direction and discharge capacity of the hydraulic pump 5 and calculates the capacity of the hydraulic motor 6 so that the rotation direction and rotation speed of the drum 2 are in the target rotation state. A control signal and a second speed switching signal are output to 5 and the hydraulic motor 6, respectively. A load pressure signal is input from the hydraulic pump 5 through a sensor to the controller 10 and a rotation direction signal and a rotation speed signal are input from the hydraulic motor 6 through the sensor. The controller 10 is based on these input signals. The operations of the hydraulic pump 5 and the hydraulic motor 6 are controlled.

  Rear operation devices 38 for enabling the drum 2 to be operated outside the mixer vehicle 100 are arranged at three locations on the rear portion of the mixer vehicle 100. As with the operation device 32, the rear operation device 38 is provided with a knob-type operation switch 38a for switching the rotation direction and the number of rotations of the drum 2, and a stop switch 38b for emergency stop of the rotation of the drum 2. It is done. A command signal is output from each rear operation device 38 to the controller 10 based on the driver operating each rear operation device 38.

  Further, the mixer vehicle 100 is provided with an automatic cleaning / kneading operation device 39 for enabling the automatic cleaning of the inside of the drum 2 and the kneading operation of the ready-mixed food outside the mixer vehicle 100.

  In addition, the controller 10 is provided with a connection connector 40 that can connect a wireless controller receiver, a communication personal computer, and a communication module.

  The operation of the drum 2 by the mixer drum drive control device 20 will be described. When the automatic stirring switch 32c is on and there is no stop signal from the parking brake 31 and the vehicle speed is equal to or higher than a predetermined speed, the controller 10 It is determined that the vehicle is running, and the drum 2 is automatically agitated and rotated in order to prevent the discharge of the raw food and to maintain the quality of the raw food. On the other hand, when the automatic agitation switch 32c is off, the controller 10 operates the operation device 32 so that the raw control in the drum 2 can be discharged to the outside even when the vehicle is traveling. Thus, the drum 2 can be rotated in the reverse direction. Further, even when a stop signal is output from the parking brake 31, the controller 10 can reversely rotate the drum 2 by operating the operation device 32 so that the live control in the drum 2 can be discharged to the outside. And

  Hereinafter, the power generation device 22 will be described with reference to FIG. FIG. 6 is a side view of the vicinity of the drive shaft 4 in the mixer vehicle 100.

  As shown in FIG. 6, the drive shaft 4 has one end 4 a connected to the power take-out mechanism 9 via the universal joint 24 and the other end 4 b connected to the input shaft 5 a of the hydraulic pump 5 via the universal joint 25. Then, the rotation of the engine 3 is transmitted to the hydraulic pump 5.

  The power generation device 22 includes a magnet 26 attached to the outer peripheral surface of the drive shaft 4 and a coil portion 27 disposed to face the outer peripheral surface of the drive shaft 4.

  A support member 29 that extends in parallel with the drive shaft 4 is coupled to the pump stay 19 that supports the hydraulic pump 5, and the coil portion 27 is fixed to the distal end portion of the support member 29. Coil portion 27 is electrically connected to power supply relay 21.

  The operation of the power generation device 22 will be described. When the driver operates the ignition switch in the cab 11 and the engine 3 is started, the drive shaft 4 also starts rotating accordingly. When the drive shaft 4 rotates and the magnet 26 on the outer peripheral surface of the drive shaft 4 passes through the coil portion 27, an electromotive force is generated in the coil portion 27. The electromotive force causes the power supply relay 21 to operate and turn on. As a result, current is supplied from the main battery 23 to the controller 10 to drive the controller 10. As described above, the controller 10 is driven based on the application of the output voltage of the power generation device 22.

  Since the power generation device 22 generates power with the rotation of the drive shaft 4, the power relay 21 is kept on when the engine 3 is running, and the controller 10 can control the drum 2. It becomes. When the engine 3 is stopped, the power generation of the power generation device 22 is also stopped, so that the supply of current from the main battery 23 to the controller 10 is stopped and the controller 10 is stopped. As described above, the controller 10 is driven only by the operation of the power generation device 22 while the engine 3 is running.

  Only one magnet 26 may be attached to the outer peripheral surface of the drive shaft 4, or a plurality of magnets 26 may be attached to the outer peripheral surface of the drive shaft 4 at a predetermined interval. However, when a plurality of magnets 26 are attached to the outer peripheral surface of the drive shaft 4, the power generation device 22 can perform stable power generation.

  As described above, the power generation device 22 generates power with the rotation of the drive shaft 4 and is a body mounted on the gantry 1, and thus is one of the constituent members of the mixer drum unit. Therefore, in the process of manufacturing the mixer drum unit, the power generator 22 can also be manufactured as a unit. As described above, the controller 10 is driven by receiving a signal from the mixer drum unit, and is not driven by receiving a signal from the ignition power source of the vehicle unlike a conventional mixer vehicle. There is no need to provide a facility for outputting a signal for driving 10. Therefore, in the assembly process of attaching the mixer drum unit to the vehicle, the operation of connecting the controller 10 and the ignition power source of the vehicle is not necessary, so that the manufacturing cost of the mixer vehicle can be reduced.

  Further, when the power generation device 22 is applied to the conventional mixer truck in which the controller 10 is disposed in the cab 11, the connection wiring between the controller 10 and the power generation device 22 becomes long, and wiring work is difficult. However, in the mixer vehicle 100, since the controller 10 is mounted on the gantry 1 and the controller 10 and the power generation device 22 together constitute a mixer drum unit, the wiring between the controller 10 and the power generation device 22 is short, and the wiring work is also simple. is there.

  Hereinafter, the rotation speed signal output mechanism 36 will be described with reference to FIGS. 7 and 8. 7 and 8 are a plan view and a front view of the vicinity of the connecting portion between the drive shaft 4 and the hydraulic pump 5 in the mixer vehicle 100, respectively.

  The rotation speed signal output mechanism 36 rotates with the rotation of the rotating portion of the transmission mechanism 8, and is arranged to face the gear 45 having a plurality of magnetized teeth 45a formed on the outer periphery and the gear 45. And a magnetic sensor 46 that detects the teeth 45a with the rotation of 45 and outputs a rotation speed pulse signal to the controller 10. The controller 10 that has received the rotation speed pulse signal calculates the rotation speed of the gear 45 from the number of rotation speed pulse signals per predetermined time.

  The gear 45 is formed in a ring shape, and teeth 45a and notches 45b are alternately formed at equal intervals on the outer periphery. The magnetic sensor 46 is supported by a support member 50 that is coupled to the pump stay 19 and extends parallel to the drive shaft 4. The magnetic sensor 46 is arranged in the axial direction of the gear 45, and is arranged so that the detection portion 46 a at the tip faces the tooth 45 a of the gear 45. As the gear 45 rotates, the teeth 45a and the notches 45b alternately face the detection unit 46a of the magnetic sensor 46, and a rotation pulse signal is output from the magnetic sensor 46 when the teeth 45a face each other.

  As shown in FIG. 7, the input shaft 5a of the hydraulic pump 5 is inserted into a hollow portion of a sleeve 48 having a flange portion 48a at an end portion. The input shaft 5a and the sleeve 48 are connected via a rotation stop mechanism and rotate integrally.

  The sleeve 48 is inserted through the hollow portion of the gear 45, and the gear 45 is disposed in surface contact with one side surface of the flange portion 48a. The flange portion 25a of the universal joint 25 is disposed in surface contact with the other side surface of the flange portion 48a. The flange portion 48a of the sleeve 48, the gear 45, and the flange portion 25a of the universal joint 25 are fastened by bolts (not shown). As a result, the drive shaft 4 and the hydraulic pump 5 are connected, and a gear 45 is provided at the connecting portion between the drive shaft 4 and the hydraulic pump 5.

  Thus, since the gear 45 is provided at the connecting portion between the drive shaft 4 and the hydraulic pump 5, the rotation speed of the gear 45 matches the rotation speed of the engine 3. Therefore, calculating the rotation speed of the gear 45 from the rotation speed pulse signal accompanying the rotation of the gear 45 calculates the rotation speed of the engine 3. That is, the controller 10 can acquire the rotational speed of the engine 3.

  As described above, the rotation speed signal output mechanism 36 outputs a rotation speed pulse signal to the controller 10 along with the rotation of the transmission mechanism 8 that transmits the rotation of the engine 3 to the hydraulic pump 5. Therefore, it is one of the constituent members of the mixer drum unit. Therefore, in the process of manufacturing the mixer drum unit, the rotation speed signal output mechanism 36 can also be manufactured as a unit. In this way, the controller 10 receives the rotation speed pulse signal output from the mixer drum unit and calculates the rotation speed of the engine 3, and the engine rotation from the engine control device on the vehicle side like a conventional mixer vehicle. Since the number information is not acquired, a cable or the like for outputting the engine speed information from the vehicle side to the controller 10 becomes unnecessary. In addition, in the assembly process for attaching the mixer drum unit to the vehicle, the connection work between the controller 10 and the equipment on the vehicle side is reduced, so that the manufacturing cost of the mixer vehicle can be reduced.

  In addition, when the controller 10 applies the rotation speed signal output mechanism 36 to a conventional mixer vehicle disposed in the cab 11, the connection wiring between the controller 10 and the rotation speed signal output mechanism 36 becomes long, and the wiring work Is also difficult. However, in the mixer vehicle 100, the controller 10 is mounted on the gantry 1, and the controller 10 and the rotation speed signal output mechanism 36 together constitute a mixer drum unit. Therefore, the wiring between the controller 10 and the rotation speed signal output mechanism 36 is short. Wiring work is also easy.

  As described above, the configuration of the rotation speed signal output mechanism 36 has been described in the case where the gear 45 is rotated in accordance with the rotation of the connecting portion between the drive shaft 4 and the hydraulic pump 5 and the rotation speed pulse signal is output to the controller 10. As another configuration of the rotation speed signal output mechanism 36, the gear 45 may be rotated in accordance with the rotation of the connecting portion between the power take-out mechanism 9 and the drive shaft 4, and the rotation speed pulse signal may be output to the controller 10. . In this case, the gear 45 may be fastened to the universal joint 24 (see FIG. 6). As another configuration of the rotation speed signal output mechanism 36, a rotation speed pulse signal may be output to the controller 10 as the drive shaft 4 rotates. In this case, the gear 45 may be coupled to the outer periphery of the drive shaft 4 so as not to be relatively rotatable, or the teeth 45 a may be formed on the outer periphery of the drive shaft 4.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

  In the above embodiment, it has been described that the controller 10 is mounted on the gantry 1. However, the controller 10 may be disposed in the cab 11.

  The present invention can be applied to a control device that drives and controls a mixer drum mounted on a mixer vehicle.

DESCRIPTION OF SYMBOLS 100 Mixer vehicle 1 Base 2 Drum 3 Traveling engine 4 Drive shaft 5 Variable displacement hydraulic pump 6 Variable displacement hydraulic motor 8 Transmission mechanism 9 Power take-off mechanism 10 Mixer drum controller 11 Cab 16 Front frame 20 Mixer drum drive controller 21 Power supply Relay 22 Power generation device 26 Magnet 27 Coil portion 45 Gear 46 Magnetic sensor

Claims (4)

A mixer drum drive control device for driving and controlling a mixer drum mounted on a mixer vehicle,
A traveling engine as a power source of the mixer drum;
Based on the power of the traveling engine, a hydraulic pump and a hydraulic motor having a variable capacity for forward / reverse rotation and acceleration / deceleration of the mixer drum;
A controller for controlling the operation of the hydraulic pump and the hydraulic motor so that the mixer drum is in a target rotational state in accordance with the rotational speed of the traveling engine;
A transmission mechanism for transmitting rotation of the traveling engine to the hydraulic pump;
A rotation speed signal output means for outputting a rotation speed signal to the controller along with the rotation of the rotating portion of the transmission mechanism;
2. The mixer drum drive control device according to claim 1, wherein the controller calculates a rotational speed of the traveling engine based on the rotational speed signal output from the rotational speed signal output means. The transmission mechanism is
A power takeout mechanism for constantly taking out power from the traveling engine;
A drive shaft that connects the power take-off mechanism and the hydraulic pump;
2. The rotating part of the transmission mechanism is a connecting part between the power take-out mechanism and the drive shaft, a connecting part between the drive shaft and the hydraulic pump, or the drive shaft. The mixer drum drive control apparatus of description. The rotation speed signal output means includes
A gear having a plurality of magnetized teeth formed on the outer periphery, which rotates with the rotation of the rotating portion of the transmission mechanism;
The mixer drum drive control device according to claim 1, further comprising: a magnetic sensor that detects teeth as the gear rotates and outputs a pulse signal to the controller.   4. The mixer drum drive control device according to claim 1, wherein the controller is mounted on a frame of the mixer vehicle. 5.

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