JPS61186626A - Control part of working device for construction machine - Google Patents

Abstract

PURPOSE:To improve reliability on a control circuit, by a method wherein an A/D converter and a D/A converter are used to both two circuits of a manual and an automatic circuit, and an output signal from a microcomputer is inputted to the ROM of a manual control circuit. CONSTITUTION:A detector PM is provided for outputting an analogue signal through detection of a control amount of a control tool, and an electromagnetic control circuit 2 is provided form selectively controlling an electromagnetic valve 1 for an actuator in response to an output signal from the detector. A manual control circuit 6, formed with an A/D converter 3, converting an analogue signal from the detector PM into a digital signal, a ROM4, and a D/A converter 5, is located in a control circuit 2. Further, a microcomputer 8 is provided for inputting a control signal for an automatic work to a ROM4 in response to an output signal from the A/D converter 3. This enables provision of a control part which is inexpensive to manufacture, decreased in the number of parts, and is easy to regulate.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a detector that detects the amount of operation of an operating tool and outputs an analog signal, and detects the amount of operation of an actuator based on the output signal from this detector. The present invention relates to an operating section of a construction machine working device that is provided with a solenoid valve operation circuit that selectively operates a solenoid valve manually or automatically.

[Conventional technology]

Conventionally, in the operating section of the above-mentioned construction machinery work equipment, as shown in Fig. 3, the analog signal from the detector (Ol) is directly input to the solenoid valve operating circuit by an amplifier ( 02), signal processing circuit for solenoid valve (03),
A manual operation circuit (06) that transmits the information to the amplifier (04) for the solenoid valve (05) via the solenoid valve (05), and a D converter (07) that converts the analog signal from the detector (01) into a digital signal.
, and a microcomputer (08) that outputs an automatic work control signal based on the output signal from the A/D converter (07);
An automatic control circuit (010) consisting of a D/A converter (09) which converts the output signal from the converter into an analog signal and inputs the analog signal to the solenoid valve amplifier (04) was provided.

[Problem that the invention seeks to solve]

However, in the manual operation circuit (06), an amplifier (02) is required for each of the many detectors (01), which increases the overall manufacturing cost and requires offset and span adjustment. It is troublesome and has poor operability, and since it is transmitted to the solenoid valve (05) as an analog signal, it has the drawback of poor reliability against changes over time.

An object of the present invention is to make the configuration of the operating circuit simple, easy to adjust, and highly reliable.

[Means for solving problems]

The characteristic configuration of the operating section of the construction machinery working device according to the present invention includes a solenoid valve operating circuit, a ^/D converter that converts an analog signal from a detector into a digital signal, and the A/D converter that converts an analog signal from a detector into a digital signal.
a manual operation circuit consisting of a ROM that outputs a setting signal based on the output signal from the A/D converter, and a D/A converter that converts the output signal from the ROM into an analog signal for operating the solenoid valve; A microcomputer is provided which inputs an automatic operation control signal into the ROM based on the output signal from the D converter, and its effects are as follows.

[For production]

In other words, in order to transmit information in the form of digital signals for both manual and automatic circuits, the circuit configuration is cheaper and simpler than installing expensive amplifiers and signal processing circuits for solenoid valves.
Moreover, it is highly reliable against changes over time, and the circuit can be easily adjusted according to the characteristics of the detector and the solenoid valve.

In addition, since the A/D converter and 1/A converter are used for both the manual and automatic circuits, and the output signal from the microcomputer is input to the ROM of the manual operation circuit, the necessary functions for both the manual and automatic circuits are required. A/D converter,
The number of D/A converters, ROMs, etc. can be reduced compared to the case where all or part of them is provided exclusively for each manual operation circuit.

〔Effect of the invention〕

Therefore, the overall operating configuration can be made inexpensive, has a small number of parts, is easy to adjust, and is highly reliable against changes over time, resulting in improved production, cost, repair, and operational performance. We are now able to provide an operation unit for construction equipment that is excellent in all aspects.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in Figure 1, each operating tool of construction equipment such as a backhoe or shovel loader has a potentiometer (
Based on the output signal from this potentiometer (PM), an operation signal for manually or automatically selecting and operating the actuator operating solenoid valve (1) is outputted via the solenoid valve amplifier (10). A solenoid valve operating circuit (2) is provided to configure the operating section.

The operation circuit (2) includes an A/D converter (3) that converts an analog signal from a potentiometer (PM) into a digital signal, and outputs a setting signal based on an output signal from the A/D converter (3). a manual operation circuit (6) consisting of a ROM (4) for operating the solenoid valve (1), and a D/A converter (5) for converting the output signal from the ROM (4) into an analog signal for operating the solenoid valve (1); Converter (3)
Automatic drilling by inputting the digitized output signal from
Then, it outputs control signals for automatic work such as automatic stop of rotation and automatic guidance to run along the target line while excavating, and outputs control signals for automatic operation such as automatic rotation stop and automatic guidance to run along the target line while excavating, and outputs control signals to the ROM via the manual automatic changeover switch (7).
(4) A microcomputer (8) is provided for input.

The ROM (4) is configured so that arbitrary characteristics can be selected according to the characteristics of the solenoid valve (1), the characteristics of the load, etc. using an attached manual changeover switch (9).

[Another example]

Instead of the potentiometer (PM), a device that detects the amount of operation of the operating tool and outputs an analog signal may be used, and these devices are collectively referred to as a detector.

In addition to providing the electromagnetic valve operation circuit (2) separately for each potentiometer (PM) provided in each operating tool, as shown in FIG. is selected by the first data selector (11) and input to one solenoid valve operation circuit (2), and outputs an operation signal processed at an address corresponding to each potentiometer (PM), and Sample holder (14) and solenoid valve amplifier (10)
), a second data selector (12) is provided to input a selection to the corresponding solenoid valve (1), and the first and second data selectors (11) and (12) select the potentiometer (P).
A switching circuit (13) is provided for switching the selection of M). The switching circuit (13) is connected to the flock generation circuit (
15) and a counter (16), and is configured to switch over time.

In addition, the switching circuit (13) is operated not only mechanically but also under the control of the microcomputer (8) to switch the data selector (11).
), (12) may be operated by switching.

[Brief explanation of drawings]

The drawings show an embodiment of the operating section of the construction machine working device according to the present invention, FIG. 1 is a block diagram of the operating circuit, FIG. 2 is a block diagram showing another embodiment, and FIG. 3 shows a conventional example. It is a block diagram. (1)...Solenoid valve, (2)...Solenoid valve operation circuit, (3)...AID converter, (4
)...ROM. (5)...D/A converter, (6)...
...Manual operation circuit, (PM)...Detector, (8
)・・・・・・Microcomputer.

Claims (1)

[Claims] A detector (PM) that detects the operation amount of the operating tool and outputs an analog signal is provided, and the solenoid valve (1) for operating the actuator is operated manually or automatically based on the output signal from this detector (PM). An operation unit of a construction machine working device, which is provided with a solenoid valve operation circuit (2) for selective operation, wherein the solenoid valve operation circuit (2) converts an analog signal from the detector (PM) into a digital signal. A/D converter to convert (3
), and a ROM (4) that outputs a setting signal based on the output signal from the A/D converter (3), and
A D/A converter (5) that converts the output signal from the ROM (4) into an analog signal for operating the solenoid valve (1).
a manual operation circuit (6) consisting of a microcomputer (8) that inputs an automatic work control signal to the ROM (4) based on the output signal from the A/D converter (3);
) is an operating section of a construction machinery working device.