JPS63134724A - Operating section of working apparatus - Google Patents

Abstract

PURPOSE:To anticipate the safety of the operation of a working apparatus and prevent a dangerous accident from happening, by setting a switch for disabling indication signal from being transmitted from a controller to solenoid proportional valves, and by enabling the switch to be worked, only when a detecting lever is at a neutral position. CONSTITUTION:Between a pressure-oil motor M and a pressure-oil pump P, a forward or reverse and neutrally switching positional change-over valve 9 rotating a swivel slide 2 to the left and right and stopping it is set, and an operating lever 6 is interlocked with a potentiometer PM, and a controller 8 regulating solenoid proportional valves 10A, 10B operating a working apparatus based on the information of the potentiometer, automatically is set. Besides, a signal circuit R transmitting indication signal to the electromagnetic proportional valves 10A, 10B from the controller 8 is provided with a switch section 19 disabling the indication signal of the controller 8 from being transmitted. When the operating lever 6 is at a neutral position, then a safety operating system provided with an electromagnetic system operating section 21 circuit- switching the switch section 19 with current from a limit switch 20 is formed.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a potentiometer that is linked to an operating lever and detects the amount of operation thereof, and an electromagnetic system that operates a working device based on information from the potentiometer. The present invention relates to an operating section of a working device that is provided with a control device that automatically adjusts the opening of a proportional valve to form an automatic operating system.

[Conventional technology]

Conventionally, in the above-mentioned operating section, the operating state of the operating lever was detected only by a potentiometer.

[Problem that the invention seeks to solve]

However, if the wire breaks inside the potentiometer, or
If a mechanical interlocking member is provided between the operating lever and the potentiometer to interlock the operating lever and the potentiometer, the interlocking member may be damaged and the relative position of the operating lever and potentiometer may shift. If this occurs, there is a risk that the control device will issue an erroneous signal similar to the operating state of the working device even when the operating lever is in the neutral position.

An object of the present invention is to prevent a signal from being transmitted from the control device to the electromagnetic proportional valve when the operating lever is in the neutral position even if the potentiometer or the interlocking member to the potentiometer is damaged.

[Means for solving problems]

A characteristic configuration of the operation section of the working device in the present invention is that a switch section is provided that disables transmission of instruction signals from the control device to the electromagnetic proportional valve, and apart from the automatic operation system, the operation lever or the member mechanically interlocked therewith is in the neutral position. A detection unit that directly detects whether the switch is in the position is provided, and based on the detection result by the detection unit, the switch is operated in a non-transmissible manner only when the control lever or a member mechanically interlocked therewith is in the neutral position. A safety operation system is formed by providing a section, and its functions and effects are as follows.

[For production]

This means that even if the potentiometer is damaged or the interlocking member that connects the potentiometer to the control lever is damaged and a false signal is sent from the potentiometer to the control, the automatic control In the safety operation system installed separately, the detection unit detects the neutral operating state of the control lever, and based on the detection result, the control unit sends an instruction signal from the control device to an electromagnetic source in order to operate the switch unit in a non-transmissible manner. It is not transmitted to the proportional valve.

〔Effect of the invention〕

Therefore, it is possible to prevent the danger of the work equipment going out of control due to an incorrect signal being output from the potentiometer even though the operating lever is in the neutral position.
It was possible to improve the safety of the operation part of the work equipment.

〔Example〕

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

As shown in Figure 3, the swivel base (
2) and the dozer device (3) are installed, and the boarding operation section (4) and the driving section (5) are installed on the swivel table (2), and the excavation work arm ( 12) is attached to form an excavation work vehicle that can be used for dozer work.

As shown in Fig. 1, between the hydraulic motor (1'l) and the hydraulic pump (P) for the swivel base (2), there are A three-position direct switching valve (9) that can be freely switched to neutral is provided, and first and second valves are provided that hydraulically operate this three-position direct switching valve (9) in opposite directions.
Electromagnetic proportional valves (10A) and (10B) are provided, a freely swingable operating lever (6) is interlocked with a potentiometer (PM), and a sensor (S) is installed to detect the angle of the swivel base (2) with respect to the vehicle body (1). ), and means (7) for setting the angle relative to the vehicle body at which the swivel base (2) should be stopped, and based on the information G from the potentiometer (PM), the sensor (S), and the setting means (7), , second electromagnetic proportional valve (104)
, (10B) is provided with a microcomputer type control device (8) for automatically operating it. The first and second solenoid proportional valves (
104), (10B) is provided with a changeover switch (18) for switching between an automatic operation state or a manual operation state, and when the automatic manual changeover switch (8) is in the manual state, information from the potentiometer (PM) is provided. On the basis of the,
in a direction commensurate with the operating direction of the operating lever (6), and
The swivel base (
2) is configured to be driven to rotate.

The potentiometer (PM) is linked to the operating lever (6), as shown in FIGS. 1 and 2. That is, the locking piece (16) of the coupling fitting (15) is locked to the notch (14) of the operation plate (13) that moves in the length direction in conjunction with the operation lever (6). Connect the camp ring fitting (X5) to the potentiometer (TQI).
is connected to the rotating shaft (17) of
3) is transmitted as rotational movement to the potentiometer (PM) via the coupling fitting (15), and the amount of operation of the operating lever (6) is taken out as a detected voltage.

The first and second electromagnetic proportional valves (10A
) and (10B), the signal circuit (
R) is provided with a switch part (19) that disables transmission of the instruction signal from the control device (8), and engages four parts of the operating plate (13) when the operating lever (6) is in the neutral position. A limit switch (20) is provided that allows current to flow, and the current from the limit switch (20) causes
An electromagnetic operation unit (
21) to form a safety operation system (B) separate from the automatic operation system (^) consisting of a potentiometer (PM) and a control device (8).

Next, the flow of control is shown in Fig. 4, which shows the entire flow in automatic swing stop control, in which the sensing routine shown in Fig. 5 is added to the conventional flow, and the output routine , the control shown in FIG. 6 is added.

[Another example]

As shown in FIG. 8, the switch section (19) and the operating section (21) are incorporated into a control device (8), and are configured to adjust the neutral position of the operating lever (6) to the limit switch (2).
0), the first and second electromagnetic proportional valves (10A),
(10B) may be prevented from being transmitted within the control device (8).

Instead of the limit switch (20), as shown in FIG. 7, a photo ink actuator, a proximity switch, etc. are placed above and below the notch of the operation plate (13) to detect light or magnetism passing through the notch. By operating the lever (6)
It is also possible to detect the neutral state of
).

In addition to electrically operating the detection section (20) and the operating section (21), there is also an operating lever (6) that is directly mechanically interlocked with the operating lever (6) or a member (13) mechanically interlocked therewith.
) may be operated to mechanically turn off the switch portion (19) as the switch portion (19) is operated to the neutral position.

The potentiometer (PM) is a direct operating lever (6
) may be interlocked and connected.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the operating section of the working device according to the present invention,
Figure 1 is a schematic operational structure diagram, Figure 2 is a perspective view of the main parts, Figure 3 is a side view of the entire excavation vehicle, Figures 4 to 6 are flowcharts, and Figure 7 is the main parts of another embodiment. The perspective view and FIG. 8 are schematic operational structure diagrams of another embodiment. (6)......Operating lever, (8)...Control device, (10A), (10B)...Solenoid proportional valve, (13)... Interlocking member, (19)...
...Switch part, (20)...Detection part, (
21)......Operation unit, (PM)...Potentiometer, (A)...Automatic operation system, (B)
...Safe operation system.

Claims (1)

[Claims] Electromagnetic proportional valves (10A) and (10B) are provided with a potentiometer (PM) that detects the amount of operation in conjunction with the operating lever (6), and operate the working device based on information from the potentiometer (PM). An operation section of a working device, which is provided with a control device (8) for automatically adjusting the opening of the electromagnetic proportional valve (10A) to form an automatic operation system (A). ), (10B) is provided with a switch section (19) that makes it impossible to transmit the instruction signal to
Apart from the automatic operation system (A), the operation lever (6)
Alternatively, a detection unit (20) is provided that directly detects whether the member (13) mechanically interlocked therewith is in the neutral position, and
An operating section (21) that operates the switch (19) in a non-transmissible manner only when the operating lever (6) or a member (13) mechanically interlocked therewith is in a neutral position based on a detection result by the detecting section (20). Safety operation system (B)
An operating section of a working device formed of a.