JP4443308B2 - Drum cleaning device - Google Patents

Description

  The present invention relates to a drum cleaning device for a mixer truck, and more particularly to a drum cleaning device for automatically cleaning the inside of a drum of a mixer truck.

  For mixer trucks, if mortar, ready-mixed concrete, etc. (hereinafter referred to as “green concrete”) remain in the drum mounted on the chassis, the stirring performance deteriorates, and in the worst case, it is difficult to charge and discharge the green concrete to the drum. Cause various adverse effects.

  Therefore, for the maintenance of the mixer truck, it is preferable to quickly clean the inside of the drum after discharging the live concrete at the construction site. However, in practice, there may not be enough space for cleaning work at the construction site. In most cases, the drum cleaning work is unavoidably performed on the road in the vicinity.

  However, this cleaning operation is usually performed while rotating the drum. The rotation of this drum requires the engine of the mixer truck to be driven, and the cleaning water containing a large amount of raw concrete after the cleaning is discarded. Since it is necessary, this cleaning operation is regarded as a problem as it deteriorates the surrounding environment.

Therefore, in order to overcome the above problem, a drum cleaning device has been proposed that can clean the inside of the drum while running after discharging the raw food (see, for example, Patent Document 1). A water level sensor is arranged in the nozzle that injects the cleaning water, and a tank that stores the cleaning water, and it is judged how much the cleaning water has flowed into the drum based on how much the cleaning water is reduced. It is said that it will prevent splashing and falling of cleaning water outside the drum when washing the drum while running the mixer truck, by devising such means as stopping the injection.
Utility Model Registration No. 3092991 (pages 5 to 12, FIGS. 3 and 8)

  However, the proposed drum cleaning apparatus may be pointed out to have the following problems.

  That is, in the above drum cleaning device, it is possible to prevent the washing water from falling and splashing outside the drum under the condition that the drum is rotating forward, but in the state where the drum is rotated reversely, that is, discharged. The cleaning water accumulated in the drum falls outside the drum.

  This is because mixer trucks are equipped with selector switches such as levers that change the rotation direction of the drums so that workers can discharge them outside the vehicle in order to discharge raw concrete at the construction site. This is because there is a situation in which the changeover switch is caught by another member or the like during traveling, and at the same time, the drum may be washed while being discharged and rotated due to misunderstanding of the operator.

  Normally, in such a situation, the driver is informed that the drum is rotating by a warning light, an alarm, etc. provided in the vehicle, so that the driver stops the discharging rotation of the drum. However, since the driver is driving the mixer truck, the driver may not be able to respond promptly. There is a risk of running while scattering.

  Accordingly, the present invention was devised to improve the above-mentioned problems, and the object of the present invention is to enable automatic washing while the mixer truck is running while preventing the washing water from falling outside the drum. A drum cleaning device is provided.

In order to achieve the above-described object, the problem-solving means of the present invention is a drum cleaning device for cleaning the inside of a drum of a mixer truck, and a cleaning cylinder provided with a cleaning nozzle for cleaning the inside of the drum, and a cleaning cylinder from the tank. a pump for supplying water, and a motor for driving the pump, and a control unit for controlling the motor, a hydraulic motor for rotating the drum, and an oil pressure pump that to supply hydraulic pressure to the hydraulic motor, the direction of rotation of the hydraulic motor a rotation direction detecting means for detecting, the control unit does not put the washing water to de ram when the drum is discharged rotation, characterized in that the drum washing does not start.

  According to the present invention, even when the mixer truck receives an indication of the intention of cleaning while traveling, when the cleaning drum is discharged and rotated, cleaning is not performed, that is, cleaning water is injected into the drum. Therefore, it is possible to reliably prevent water falling during automatic washing while the mixer vehicle is running.

  The present invention will be described below based on the illustrated embodiment. FIG. 1 is a conceptual diagram of a drum cleaning device according to an embodiment. FIG. 2 is a flowchart showing a cleaning procedure of the drum cleaning device according to the embodiment.

  As shown in FIG. 1, a drum cleaning apparatus according to an embodiment includes a cleaning cylinder 1 having a cleaning nozzle for cleaning the inside of the drum 10, a pump 2 for supplying cleaning water from a tank T to the cleaning cylinder 1, and a pump 2, a control unit 5 that controls the motor 3, a rotation direction detection unit that detects the rotation direction of a hydraulic motor 11 that is a drive source that rotates the drum 10, and a load is loaded in the drum 10. It is comprised with the load detection means which detects whether it is carried out.

  On the other hand, in order to rotationally drive the drum 10, a hydraulic motor 11 serving as a drive source connected to the end of the drum 10 and a bidirectional discharge hydraulic pump 12 that supplies hydraulic pressure to the hydraulic motor 11 are provided. Yes.

  The hydraulic pump 12 is connected to an engine (not shown) of the mixer vehicle via a PTO (Power Take Off), and the rotational motion of the crankshaft of the engine is transmitted to be driven to rotate.

The hydraulic pump 12 is specifically configured as an axial type pump that changes the discharge direction and the discharge amount by changing the inclination angle of a swash plate cam (not shown). The hydraulic motor 11 connected via the pipe line 14 can be rotated forward and backward, respectively.

  A proximity switch 6 that is a rotation direction detecting means is installed opposite to the tilt cam. For example, when the tilt cam is switched to a position close to the proximity switch 6, the hydraulic motor 11 causes the drum 10 to move. It is set to reversely rotate, that is, to rotate the drum 10 so as to discharge the raw concrete that is the load. The proximity switch 6 is turned on when the proximity of the inclined cam is detected, and the on signal is sent to the control unit 5. Can be communicated to.

  Further, a pressure switch 7 serving as a load detecting means is provided in the middle of the conduit 14a on the side for supplying hydraulic pressure to the hydraulic motor 11 when the hydraulic motor 11 rotates the drum 10 forward. Is turned on when the pressure in the pipe line 14a becomes equal to or higher than a set value, and the ON signal is transmitted to the control unit 5.

And the control part 5 should just receive the signal from the said proximity switch 6 and the pressure switch 7, and can output the electric current or voltage required in order to drive the motor 3, Specifically, Although not shown as hardware, an amplifier for amplifying an ON signal from the proximity switch 6 and the pressure sensor 7, a converter for converting an analog signal into a digital signal, and an arithmetic device such as a CPU (Central Processing Unit) , ROM (Read Only Memory) and the like, and a drive circuit for the motor 3, the calculation processing procedure and control signal output procedure necessary for the drive control of the motor M are stored in advance in the ROM and other storage devices as a program. It may be a well-known computer system for storing, or the proximity switch 6 It is also possible to realize the drive control of the motor 3 with a simple circuit configuration without using an arithmetic unit such as when using a device such as a switching operation by a signal.

  And the drum washing apparatus comprised as mentioned above is controlled according to the control procedure shown in FIG. This control procedure is stored in advance in the storage device of the control unit 5 as described above.

  Hereinafter, this control procedure will be described. First, in step F1, it is determined whether or not the rotation direction of the drum 10 is the discharge rotation direction. Specifically, the control unit 5 determines whether or not the hydraulic motor 12 is rotating the drum 10 by the signal output from the proximity switch 6.

  That is, when the tilt cam of the hydraulic pump 11 is close to the proximity switch 6, the proximity switch 6 senses the approach of the tilt cam and outputs an ON signal to the control unit 5, and the control unit 5 receives this ON signal. If it is determined that the drum 10 is rotating, the drum 10 is determined to be in the forward rotation or stopped state when the tilt cam is not close to the proximity switch 6. If it is determined that the drum 10 is rotating and discharging, the process ends without performing cleaning, and if it is determined that the drum 10 is not discharging and rotating, the process proceeds to step F2.

  Incidentally, in the present embodiment, the rotation direction detecting means is the proximity switch 6, but instead of the proximity switch 6, a sensor capable of detecting the rotation direction of the hydraulic motor 12 or the rotation direction of the drum 10, for example, A rotary encoder or the like can be used.

  In the process of step F1, a switch for performing drum cleaning intention display, for example, automatic cleaning is provided by the cleaning operator, and when this switch is turned on by the cleaning operator, the process is automatically performed. It has come to be.

  Therefore, even if the mixer truck receives an indication of the intention of washing while the mixer is running, washing is not performed when the washing drum 10 is rotating, that is, the controller 5 does not drive the motor 3 and does washing. Since water is not sprayed into the drum 10, it is possible to reliably prevent water from falling during automatic washing while the mixer vehicle is running.

  Subsequently, in step F2, it is determined whether or not a raw component as a load is loaded in the drum 10. Specifically, when the pressure switch 7 is turned on, the loading of the live control unit is detected. When the pressure switch 7 is turned on, the control unit 5 determines that the live control unit is loaded in the drum 10.

  That is, since the torque for rotating the drum 10 is higher in the state where the drum 10 is loaded in the drum 10 than in the empty state in the drum 10, the pressure in the pipe 14 a that supplies hydraulic pressure to the hydraulic motor 12 is Since it becomes higher when the raw concrete is loaded, the pressure switch 7 is set to be turned on by the pressure at this time.

  In the automatic cleaning, cleaning water is stored in the drum 10, but in the case of cleaning water, the fluidity is higher than that of the raw control, so the torque for rotating the drum 10 is much smaller than that when loading the raw control. Therefore, the pressure switch 7 is not turned on.

  Then, if it is determined that the ready-container is being loaded, the process is terminated without cleaning, and conversely, if it is determined that it is not being loaded, the process proceeds to step F3.

  Therefore, the cleaning operation during loading of the raw concrete is avoided by the processing of step F2, and even if the operator makes an intention to perform automatic washing by mistake, the quality of the raw concrete is deteriorated, that is, an appropriate water cement ratio is obtained. It is possible to prevent a decrease in the strength of the concrete after curing without being realized.

  In short, in the drum cleaning apparatus according to the present embodiment, the deterioration of the quality of the live control due to unnecessary water mixing into the live control due to human error is avoided.

  Further, in the present embodiment, the load detecting means is the pressure switch 7 in the present embodiment. However, since it is sufficient that the weight of the load in the drum 10 can be detected, a pressure sensor may be used. In this case, it is convenient that it is possible to detect a failure of the drum drive system in combination with the rotation detecting means, and that automatic cleaning is not performed at the time of the failure.

  Further, the loading detection means may be configured to detect the torque of the hydraulic motor 12, and detects the weight of the drum 10, specifically, measures the distortion of a support member or the like that supports the drum 10. However, the method of detecting the weight of the drum 10 is more accurate than the method of accurately detecting the torque of the hydraulic motor 12 by vibrations during traveling of the mixer vehicle. Therefore, it is advantageous to detect the torque of the hydraulic motor 12 in that respect.

  Further, in step F3, the control unit 5 drives the motor 3 to drive the pump 2 when the drum 10 is not in the discharging rotation based on the determinations in the steps F1 and F2 and that the live control is not loaded in the drum 10. To supply the cleaning water stored in the tank T to the cleaning cylinder 1.

  Then, cleaning water is jetted from the cleaning nozzle provided in the cleaning cylinder 1 and the inside of the drum 10 is cleaned.

  After the start of the cleaning, in step F4, it is determined whether or not an arbitrarily set cleaning time has elapsed. If the cleaning time has elapsed, the automatic cleaning ends.

Note that when the hydraulic pump 11 is switched to a position for discharging and rotating the drum 10 for some reason during traveling of the mixer vehicle, the control unit 5 is caused to perform the same determination as in step F1 during automatic cleaning. In addition, since the automatic cleaning can be finished, the risk of falling water can be further avoided.

  As described above, in the drum cleaning apparatus according to the present embodiment, automatic cleaning while the mixer truck is running can be performed while preventing the cleaning water from falling outside the drum.

  In the above description, the drum 10 is rotated by using a hydraulic pump and a hydraulic motor. However, an object of the present invention is that automatic cleaning is not performed during the discharge rotation of the drum 10. Therefore, for detecting the driving and discharging rotation of the drum, other known techniques may be used. However, as described above, the stack detection for detecting whether or not the raw concrete is loaded in the drum 10. In mounting the means, it is advantageous in that respect because it is possible to accurately detect the loading of the raw control by combining a hydraulic motor and a device capable of torque detection.

  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

It is a conceptual diagram of the drum washing | cleaning apparatus in one Embodiment. It is the flowchart which showed the washing | cleaning procedure of the drum washing | cleaning apparatus in one Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cleaning cylinder 2 Pump 3 Motor 5 Control part 6 Proximity switch which is a rotation direction detection means 7 Pressure switch 10 which is a load detection means Drum 11 Hydraulic motor 12 which is a drive source Hydraulic pumps 14 and 14a Pipe line T Tank

Claims (2)

In a drum cleaning device for cleaning the inside of a mixer car drum, a cleaning cylinder having a cleaning nozzle for cleaning the inside of the drum, a pump for supplying cleaning water from the tank to the cleaning cylinder, a motor for driving the pump, and a motor control a control unit for a hydraulic motor for rotating the drum, and an oil pressure pump that to supply hydraulic pressure to the hydraulic motor, and a rotation direction detecting means for detecting a rotational direction of the hydraulic motor, and the control unit, drum the wash water without feeding the de ram if you are discharged rotating drum cleaning apparatus characterized by the drum cleaning is not started.   A load detecting means for detecting whether or not a load is loaded in the drum; the load detecting means is a side on which a hydraulic pump supplies hydraulic pressure to the hydraulic motor when the hydraulic motor rotates the drum in a forward direction; The drum cleaning device according to claim 1, wherein the drum cleaning device is a pressure switch provided in the middle of the pipe.

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