JP2001227004A - Operation control device for work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To grasp a substantial operation state of a work machine with a simple means. SOLUTION: This work machine having a hydraulic power source 2, an actuator 3 actuated by pressure oil supplied and discharged from the hydraulic power source 2 and a directional control valve 5 arranged in a main pipeline for connecting the hydraulic power source 2 to the actuator 3 and controlling the direction and a flow rate of the pressure oil supplied and discharged to the actuator 3 by being operated by an operation means 4, is featured, by having a hydraulic pressure sensor 6 being arranged in the main pipeline between the directional control valve 5 and the hydraulic power source 2 and detecting hydraulic pressure supplied and discharged from the hydraulic power source 2, an operation judging means 71 for judging whether or not the work machine operates by comparing a hydraulic pressure signal with a prescribed value by inputting the hydraulic pressure signal from the hydraulic pressure sensor 6 and an operation data recording means 72 for recording the elapsed time as operation data when judged as being in operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation management device for a working machine, and more particularly to an operation management device for a working machine driven by hydraulic pressure such as a hydraulic shovel or a crane.

[0002]

2. Description of the Related Art In general, working machines such as hydraulic shovels and cranes are often used under severe conditions, and each part of the machine is severely damaged. Is required. As a general maintenance pipe filling method for work machines, use the hour meter installed on the work machine, count up the hour meter while the power is on, grasp the operation time, and perform maintenance management There is something. As a method of determining the operating state, Japanese Patent Application Laid-Open No. 62-247938 discloses a method of detecting the operating state using an engine oil pressure sensor. In this method, the presence or absence of engine start is determined based on a change in oil pressure of an engine oil pressure sensor.

[0003]

However, in the method of grasping the operating state by the above-mentioned hour meter, the work machine counts up while the power is turned on even if the working machine is not in the substantial operating state. The operating state of the work machine cannot be accurately grasped.

In the method disclosed in the above-mentioned publication, the operating state is detected by detecting the engine oil pressure, even if the engine is idle or the working machine is not operated at all, the operating state is detected. Therefore, the operation time is measured as an operation time equivalent to an operation such as an excavation operation in which each part of the machine is severely damaged, so that the maintenance management data becomes inaccurate.

[0005] The object of the present invention, in view of the above problems,
It is an object of the present invention to provide a work machine operation management device capable of grasping a substantial operation state of the work machine by simple means.

[0006]

The present invention employs the following means in order to solve the above-mentioned problems.

The first means is provided on a hydraulic source, an actuator operated by pressure oil supplied / discharged from the hydraulic source, and a main conduit connecting the hydraulic source and the actuator, and operated by operating means. A working machine having a directional control valve for controlling the direction and flow rate of pressure oil supplied and discharged to and from the actuator, provided in a main conduit between the directional control valve and the hydraulic source, and supplied and discharged from the hydraulic source. An oil pressure sensor for detecting oil pressure, an oil pressure signal from the oil pressure sensor, operation judgment means for comparing the oil pressure signal with a predetermined value, and judging whether or not the work machine is operating, And operating data recording means for recording the elapsed time as operation data when it is determined that the operation is in progress.

[0008] A second means is the first means, wherein the pressure sensor is provided near a discharge port of the hydraulic pressure source, and the operation judging means is provided when a hydraulic signal detected by the pressure sensor is larger than a predetermined value. And determining that the working machine is operating.

The third means is the first means, wherein the pressure sensor is provided in a return line of the discharge oil discharged from the hydraulic pressure source at a neutral position of the direction control valve, and the pressure sensor discharges the pressure sensor. A throttle is provided in the return line on the oil discharge side, and the operation determining unit determines that the work machine is operating when a hydraulic signal detected by the pressure sensor is smaller than a predetermined value. I do.

[0010] A fourth means is the one of the first means to the fourth means, wherein the operation data recorded by the operation data recording means is transmitted to a management section for managing the work machine. Operation data transmitting means for the operation.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a hydraulic circuit diagram of a work machine operation management device according to the present embodiment.

In the figure, 1 is a hydraulic oil tank, 2 is a main pump which is a power source of the work machine, 3 is an actuator of the work machine, 4 is an operation lever for an operator to operate the work machine, 5 is an operation lever. A directional control valve for controlling the flow direction and amount of pressure oil to the actuator 3 by the lever 4; 6 is a pressure sensor provided on the discharge side of the main pump 2 for detecting the operating state of the work machine; Is a controller that measures operation data based on the pump discharge pressure detected by the pressure sensor 6, and 8 is an engine that drives the main pump 2.

The controller 7 has an operation determining unit 71 for determining whether or not the work machine is operating based on a hydraulic pressure signal detected by the pressure sensor 6, and a controller for determining whether or not the operating machine is operating. An operation data recording unit 72 that starts measurement and records the measured operation data, and an operation data transmission unit 73 that transmits the recorded operation data to a management unit (not shown) that manages the work machine. Prepare.

FIG. 2 is a diagram showing the time course of the pump discharge pressure waveform detected by the pressure sensor 6 shown in FIG.

In FIG. 1, P1 indicates a substantial operating state.
It is a set pressure provided to determine the non-operation state,
As shown in the figure, if there is no operation input by the operator after the engine starts, the pump discharge pressure Px of the main pump 2
Is less than or equal to the set pressure P1, and the controller 7 determines that it is not operating during this period. When the operation is started by an operation input by the operator, the main pump discharge pressure Px becomes P1 or more to drive the actuator 3, and the controller 7 determines that the work machine is in a substantially operating state, and starts measurement. .

FIG. 3 is a flowchart showing a processing procedure of the operating state measurement processing in the controller 7 shown in FIG.

First, in step 1, it is determined whether or not the engine 8 of the work machine has been started. If the engine 8 has not been started, it is determined that the work machine is not in the operating state, and the measurement process is terminated. When the engine 8 is in the starting state, in step 2, the operation determination unit 71 determines whether the pump discharge pressure Px detected by the pressure sensor 6 is higher than the set pressure P1. When it is determined that it is not large, it is determined that it is not in a substantial operating state, and the processing from step 1 is repeated. If it is determined that the pump discharge pressure Px is higher than the set pressure P1, in step 3, it is determined that the pump is substantially in operation, and the operation time is counted up. Then
In step 4, the operation data that has been counted up and integrated is recorded in the operation data recording unit 72. After recording the operation time, the processing from step 1 is repeated.

As described above, according to the invention of this embodiment,
Pump discharge pressure Px equal to or higher than set pressure P1 from main pump 2.
In the state where is supplied to the actuator 3, the operating time is integrated assuming that the operating machine is in the operating state, so that the operating time in which the working machine is substantially in the operating state can be accurately grasped.

Further, according to the present embodiment, the operation data recorded in the operation data recording section 72 is transmitted to the management section for managing the work machine by the operation data transmission section 73, so that the operation The operating status can be managed remotely.

Next, a second embodiment of the present invention will be described with reference to FIGS.

FIG. 4 is a hydraulic circuit diagram of the operation management device for the working machine according to the present embodiment.

In FIG. 1, numeral 9 denotes a tank return line a for discharging the oil discharged from the main pump 2 to the hydraulic oil tank 1 at a neutral position of the directional control valve 5 in order to detect the operating state of the working machine. The pressure sensors 10 are throttle valves provided between the pressure sensor 9 provided in the tank return pipe a and the hydraulic oil tank 1. Other configurations are shown in FIG.
The description is omitted because it corresponds to the configuration of the same symbol shown in FIG.

FIG. 5 is a diagram showing the time course of the pump return pressure waveform detected by the pressure sensor 9 shown in FIG.

In the figure, P2 indicates a substantial operating state.
It is a set pressure provided to determine the non-operation state,
As shown in the figure, if there is no operation input by the operator after the engine is started, the pressure oil discharged from the main pump 2 passes through the tank return line a as it is by the direction control valve 5 and is detected by the pressure sensor 9. The tank return line pressure Py rises above the set pressure P2, and it is determined that the controller 7 is not operating during this period. When the operation is started by an operation input by the operator, the tank return line a is closed, and the pressure oil passes through the actuator 3 and passes through the tank return line b, so that the tank return line pressure detected by the pressure sensor 9 is detected. Py becomes equal to or less than the set pressure P2, and the controller 7 determines that the work machine is in a substantial operating state, and starts measurement.

FIG. 6 is a flowchart showing a processing procedure of the operation state measurement processing in the controller 7 shown in FIG.

First, in step 11, it is determined whether or not the engine of the work machine has been started, and if the engine has not been started, it is determined that the engine is not in the operating state, and the measurement process is terminated. When the engine is in the starting state, step 1
In 2, the operation determination unit 71 determines whether the tank return pipeline pressure Py detected by the pressure sensor 9 is smaller than the set pressure P2. If it is determined that it is not smaller, it is determined that it is not substantially in the operating state, and the processing from step 11 is repeated. If it is determined that the tank return line pressure Py is smaller than the set pressure P2, the operation time is counted up in step 13 assuming that the tank is substantially in the operating state. Next, in step 14, the operation time counted up and integrated is recorded in the operation data recording unit 72. After recording the operation time, the processing from step 11 is repeated.

As described above, according to the invention of this embodiment,
The direction control valve 5 is switched by the operation of the operator, and the pressure sensor 9 switches from the state where the pump discharge pressure is detected at the neutral position of the direction control valve 5 to the state where the tank return pressure is detected as the pump return pressure Py. In other words, in a state where the pump return pressure Py is equal to or less than the set pressure P2, the operating time is integrated assuming that the operating state is in operation, so that the operating time in which the working machine is substantially in operating state can be accurately grasped.

Also, in the invention of this embodiment, similarly to the invention of the first embodiment, the operation data is transmitted by the operation data transmission unit 73 to the management unit that manages the work machine. The operating status can be managed remotely.

[0030]

According to the first aspect of the present invention, since the supply / discharge pressure of the hydraulic power source, which is the power source of the work machine, is detected, the substantial operation state of the work machine can be grasped. Therefore, the engine idle time or the no-operation time and the actual operation time can be clearly distinguished.

Further, since the operation time close to the actual operation can be measured, the maintenance of each part of the working machine can be performed reasonably and simply.

According to the second aspect of the present invention, in a state where the discharge pressure equal to or higher than the predetermined pressure is output from the hydraulic pressure source, the operating time is integrated and the operating time is integrated. The operating time in the operating state can be accurately grasped.

According to the third aspect of the present invention, the state in which the pump discharge pressure is detected at the neutral position of the directional control valve is switched to the state in which the tank return pressure is detected, so that the pump return pressure becomes a predetermined value. Under pressure
Since the operating time is integrated assuming that the operating machine is in the operating state, the operating time in which the working machine is substantially in the operating state can be accurately grasped.

According to the invention described in claim 4 of the present application, the recorded operation data is transmitted to the management section that manages the work machine, so that the operation state of the work machine can be remotely managed. it can.

[Brief description of the drawings]

FIG. 1 is a hydraulic circuit diagram of a work machine operation management device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a time course of a pump discharge pressure waveform detected by a pressure sensor 6 shown in FIG.

FIG. 3 is a flowchart showing a processing procedure of an operation state measurement process in a controller 7 shown in FIG. 1;

FIG. 4 is a hydraulic circuit diagram of a work machine operation management device according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a time course of a pump return pressure waveform detected by the pressure sensor 9 shown in FIG. 4;

6 is a flowchart showing a processing procedure of an operation state measurement process in the controller 7 shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic oil tank 2 Main pump 3 Actuator 4 Operation lever 5 Direction control valve 6 Pressure sensor 7 Controller 71 Operation determination part 72 Operation data recording part 73 Operation data transmission part 8 Engine 9 Pressure sensor 10 Throttle valve

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hiroyuki Adachi 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. F-term in Tsuchiura factory (reference) 3D026 BA05 BA31 BA39

Claims (4)

[Claims] 1. An actuator which is provided by a hydraulic source, an actuator which is operated by pressure oil supplied / discharged from the hydraulic source, and a main pipe connecting the hydraulic source and the actuator, and which is operated by an operating means to actuate the actuator. In a work machine having a directional control valve for controlling the direction and flow rate of pressure oil to be supplied and discharged, the work machine is provided in a main pipeline between the directional control valve and the hydraulic source, and detects a hydraulic pressure supplied and discharged from the hydraulic source. A hydraulic pressure sensor, a hydraulic pressure signal from the hydraulic pressure sensor is input, and the hydraulic pressure signal is compared with a predetermined value to determine whether or not the work machine is in operation. And an operation data recording means for recording the elapsed time as operation data when the judgment is made. 2. The pressure sensor is provided near a discharge port of the hydraulic pressure source, and the operation determining means determines that the working machine is operating when a hydraulic signal detected by the pressure sensor is larger than a predetermined value. The operation recording device for a working machine according to claim 1, wherein the determination is made. 3. The pressure sensor is provided in a return line of discharge oil discharged from the hydraulic pressure source at a neutral position of the direction control valve, and is provided in the return line on a discharge oil discharge side of the pressure sensor. 2. The operation of the work machine according to claim 1, wherein a throttle is provided, and the operation determination unit determines that the work machine is operating when a hydraulic pressure signal detected by the pressure sensor is smaller than a predetermined value. Management device. 4. An operation data transmitting means for transmitting operation data recorded by said operation data recording means to a management section for managing said work machine. An operation management device for a work machine according to claim 1.