WO2018055790A1

WO2018055790A1 - Compact construction machine

Info

Publication number: WO2018055790A1
Application number: PCT/JP2017/006682
Authority: WO
Inventors: 沢哉野村; 川本　純也; 湯上　誠之; 幸平前田; 嘉勝隅田
Original assignee: 株式会社日立建機ティエラ
Priority date: 2016-09-23
Filing date: 2017-02-22
Publication date: 2018-03-29
Also published as: JP6577436B2; JP2018048530A

Abstract

In order to stop screen operations on a monitor while a gate lock lever is lowered and suppress operational errors, a compact construction machine according to the present invention is provided with: a monitor 14 disposed to the right and front of a driver's seat 8; and a gate lock lever 13 that when raised, turns off a gate lock switch 22, so that the supply of pressure oil from a hydraulic pump to driving circuits of a traveling body 1, a swing body 2, and a work device 3 is stopped, and when lowered, turns on a gate lock switch 20, so that the supply of the pressure oil from the hydraulic pump to the driving circuits is allowed. The compact construction machine is further provided with a control device 14a that, when the engine is in a driving state and while the gate lock lever 13 is lowered, invalidates the operation of a monitor switch 22 provided on the monitor 14 and stops the specific display of a portion of a normal screen of the monitor 14.

Description

Small construction machinery

The present invention relates to a small-sized construction machine such as a miniature excavator, such as a rear small turning type and an ultra-small turning type excavator, provided with a monitor arranged at the right front of the driver's seat and a gate lock lever arranged at the entrance / exit of the driver's seat. About.

This type of prior art is disclosed in Patent Document 1. This prior art is a turning work vehicle that constitutes a small construction machine, and includes a traveling body, a turning body disposed on the traveling body, and a working device attached to the turning body. An engine in which a driver's seat is provided on the swivel body, and the engine is housed below the driver's seat under the restriction of the equipment arrangement space on the swivel body to constitute the rear small turn type and the ultra small turn type The room is located. The backward small turning type and the ultra small turning type are formed in a circular shape so that at least the rear end side of the turning body is within the vehicle width of the traveling body.

Although not shown in Patent Document 1, a turning work vehicle constituting this type of small construction machine is driven by an engine to drive a drive system such as the traveling body, the turning body, and the working device described above. There are provided a hydraulic pump for supplying pressure oil to the driving circuit and a pilot pump for supplying operating pressure to the operating device for remotely operating the drive system.

Moreover, the prior art disclosed in Patent Document 1 is arranged close to the periphery of the driver's seat due to restrictions on the device arrangement space, and each operating lever (operating device) that operates the traveling body, the turning body, and the work device. And a monitor that is disposed in front of the driver's seat and that displays the operating status. Further, a gate lock lever that can be raised and lowered to operate a gate lock switch that outputs a signal for stopping or allowing the supply of the pressure oil from the hydraulic pump to the drive circuit is provided. The gate lock lever is attached so as to be rotatable in the vertical direction with respect to the entrance / exit side on the side of the driver's seat in order to open / close the entrance / exit to the driver's seat in the revolving structure.

When the gate lock lever is raised and the entrance is opened, the gate lock switch described above is turned off in conjunction with the raising operation, the supply of pressure oil from the hydraulic pump to the drive circuit is stopped, and the gate lock lever is lowered. When the entrance / exit is closed, the aforementioned gate lock switch is turned on to allow the supply of pressure oil from the hydraulic pump to the drive circuit. Therefore, when any one of the operation levers is operated in a state where the gate lock lever is lowered, the pressure oil from the hydraulic pump is supplied to the drive circuit to start the operation.

Japanese Patent No. 5841008

In the prior art disclosed in Patent Document 1 described above, when the gate lock lever is in the lowered state, the engine is driven and the pressure oil from the hydraulic pump is supplied to the drive circuit, and the driver seat When an operator seated in the vehicle tries to operate various buttons for operating a monitor switch provided on the monitor in order to operate a monitor screen arranged on the right front side of the driver's seat, the operator is placed close to the driver's seat. There is a risk of touching the control lever. For small construction machines, when the operator who gets off is in a state where the gate lock lever is lowered, the monitor screen may be operated from the side of the revolving unit. There is a risk of contact with the lever. As described above, if the operator's arm or the like accidentally touches the operation lever during the screen operation of the monitor, there is a risk of causing a malfunction that is not intended by the operator.

In order to solve the above-described problems, an object of the present invention is to provide a small construction machine capable of suppressing malfunction by stopping the screen operation of the monitor with the gate lock lever lowered.

In order to solve the above problems, a small construction machine according to the present invention is provided on a traveling body, a revolving body disposed on the traveling body, a work device attached to the revolving body, and the revolving body. Pressure oil is supplied to a driver's seat, an engine compartment that is disposed below the driver's seat and houses an engine, and a driving circuit that is driven by the engine to drive the traveling body, the swivel body, and the working device. A hydraulic pump that is disposed around the driver's seat, an operating device that operates the traveling body, the swivel body, and the working device, a monitor that is disposed right in front of the driver's seat, and a swivel body A gate lock lever that can be turned up and down to operate a gate lock switch that is arranged at the entrance to the driver's seat and outputs a signal for stopping or allowing the supply of pressure oil from the hydraulic pump to the drive circuit. When the gate lock lever is raised, the gate lock switch is turned off, the supply of pressure oil from the hydraulic pump to the drive circuit is stopped, and the gate lock lever is lowered. Sometimes, in a small construction machine in which the gate lock switch is turned on and pressure oil is allowed to be supplied from the hydraulic pump to the drive circuit, the gate lock lever is lowered while the engine is driven. In this state, the operation of the monitor switch provided in the monitor is invalidated, and at this time, the monitor is provided with a control device for stopping a part of specific display on the normal screen.

The small construction machine according to the present invention is monitored by the control device when the engine is driven, the gate lock lever is lowered, and the pressure oil from the hydraulic pump can be supplied to the drive circuit that drives the drive system such as the work device. The switch operation is invalidated, and some specific displays on the normal screen of the monitor are stopped. That is, it is possible to alert the operator that the monitor function is limited and the monitor cannot be normally operated. As a result, it is possible to suppress the operator's arm or hand from touching the operating device when operating the monitor screen, which could possibly occur in the past, and to prevent malfunctions of the traveling body, the turning body, and the work device.

It is a side view which shows the mini excavator which comprises one Embodiment of the small construction machine which concerns on this invention. It is a principal part enlarged view of FIG. It is a figure which shows the monitor with which this embodiment was equipped, and is a front view which shows the state of a monitor switch effective process. It is a figure which shows the monitor with which this embodiment was equipped, and is a front view which shows the state of a monitor switch invalidation process. It is a flowchart which shows the process sequence in the control apparatus provided in the monitor with which this embodiment was equipped.

Hereinafter, embodiments of a small construction machine according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the small construction machine according to the present embodiment includes a canopy-type mini excavator of a small rear turning type formed in a circular shape so that at least the rear end side of the turning body is within the vehicle width of the traveling body. It is configured.

The revolving body 2 having the above-described cab 7 is disposed on the traveling body 1, and a work device 3 that performs excavation work of soil and the like is attached to the revolving body 2 so as to be rotatable in the vertical direction. The work device 3 includes the above-described boom 4 attached to the swing body 2, the arm 5 attached to the tip of the boom 4, and the above-described bucket 6 attached to the tip of the arm 5. The working device 3 includes a boom cylinder 4 a that drives the boom 4, an arm cylinder 5 a that drives the arm 5, and a bucket cylinder 6 a that drives the bucket 6.

As shown in FIG. 2, a driver's seat 8 on which an operator is seated is disposed in the operator's cab 7. As shown in FIG. 1, an engine room 16 in which an engine is housed is provided in the revolving unit 2 located below the driver's seat 8. A counterweight 15 that secures a weight balance is provided at a rear portion of the revolving structure 2.

Although not shown in the drawings, a hydraulic pump that supplies pressure oil to a drive circuit that is driven by an engine and drives a drive system such as the traveling body 1, the revolving body 2, and the work device 3, and each operation for remotely operating the drive system A pilot pump that supplies the operating pressure of the apparatus is provided in the engine compartment 16.

As shown in FIG. 2,

operating devices

10 a and 10 b for operating the traveling body 1 are disposed at the front side position of the driver seat 8, and the work device 3 is vertically positioned at the left and right positions of the driver seat 8. Operation devices 12a and 12b for rotating the swivel body 2 or turning the revolving body 2 are arranged. In other words, the

operating devices

10a, 10b, 12a, and 12b are arranged close to the periphery of the driver's seat 8 under the restriction of the device arrangement space on the revolving structure that constitutes the rear small turning type.

In the front right of the driver's seat 8, a monitor 14 for displaying the operation status is arranged. Further, a gate lock lever 13 is disposed at the entrance / exit of the driver's seat 8, and a gate for outputting a signal for stopping or allowing the supply of the pressure oil from the hydraulic pump to the drive circuit described above by the gate lock lever 13. The lock switch 22 (shown in FIGS. 3 and 4) is operated. The gate lock lever 13 is attached to the side of the driver's seat 8 on the side of the driver's seat 8 so as to be able to turn in the vertical direction in order to open and close the entrance / exit to the driver's seat 8 in the revolving structure 2.

When the gate lock lever 13 is raised and the entrance is opened, the gate lock switch 22 is turned off in conjunction with the raising operation, the supply of pressure oil from the hydraulic pump to the drive circuit is stopped, and the traveling body 1 and the revolving body 2 and the working device 3 cannot be driven. When the gate lock lever 13 is lowered and the entrance / exit is closed, the gate lock switch 22 is turned on and the supply of pressure oil from the hydraulic pump to the drive circuit is allowed, and the

operation devices

10a and 10b and the operation devices 12a and 12b are turned off. The traveling body 1, the revolving body 2, and the work device 3 can be driven by operating. Therefore, when any one of the

operation devices

10a, 10b, 12a, and 12b is operated in a state where the gate lock lever 13 is lowered, the pressure oil from the hydraulic pump is supplied to the drive circuit and the operation is started.

As shown in FIGS. 3 and 4, when the engine is in a driving state and the gate lock lever 13 is in a lowered state, the operation of the monitor button for operating the monitor switch for operating the screen provided on the monitor 14 is operated. The control device 14a for stopping a part of the specific display although the display (water temperature gauge, fuel gauge, and other important ones) normally necessary for the operation of the mini excavator on the normal screen of the monitor 14 is displayed. It has. The control device 14a is provided inside the monitor 14, for example. The control device 14a includes a signal output from the key switch 20 that is turned on by inserting and rotating the engine key into the key hole, a signal output from the rotational speed sensor 21 that detects the rotational speed of the engine, The signal output from the gate lock switch 22 described above is input.

The monitor buttons described above include a menu button 14b, a content selection / change button 14c, a mode switching button 14d for switching work modes, and a decision button 14e. When the menu button 14b, the content selection / change button 14c, the mode switching button 14d, or the decision button 14e is operated, the corresponding monitor switch is activated, and a normal screen is displayed on the display unit 14f as shown in FIG. .

When the operation of the menu button 14b, the content selection / change button 14c, the mode switching button 14d, and the decision button 14e for operating the monitor switch by the control device 14a is invalidated, the display on the monitor 14 is displayed as shown in FIG. Part of the specific display on the normal screen of the unit 14f stops. Some specific indications include: A / I (auto idle) status displayed in conjunction with the operation of the monitor button enabled when the gate lock lever 13 is raised, work mode status, ML It is a display showing the state of (crane mode).

The control device 14a includes a key switch determining unit that determines whether or not the key switch 20 is on based on a signal output from the key switch 20, and an engine in a driving state based on a signal output from the rotation speed sensor 21. An engine drive determining unit for determining whether the gate lock switch 22 is off, a gate lock determining unit for determining whether the gate lock switch 22 is off based on a signal output from the gate lock switch 22, and a switch for the menu button 14b constituting the monitor switch And a monitor switch determination unit for determining whether any of the switch of the content selection / change button 14c, the switch of the mode switching button 14d, and the switch of the decision button 14e has been operated.

The key switch determining unit determines that the key switch 20 is on, the engine driving determining unit determines that the engine is in a driving state, and the gate lock determining unit does not turn off the gate lock switch 22, that is, it is on When it is determined that the control switch 14a has been configured, the control device 14a switches the menu button 14b, the content selection / change button 14c, the mode switching button 14d, and the decision button 14e that constitute the monitor switch. As shown in FIG. 4, the operation is disabled, and a part of specific display on the normal screen of the display unit 14 f of the monitor 14 is stopped.

Further, as described above, the control device 14a determines that the key switch 20 is turned on by the key switch determination unit, determines that the engine is in a driving state by the engine drive determination unit, and determines the gate lock switch by the gate lock determination unit. When it is determined that the switch 22 is turned on, as shown in FIG. 4, a switch of the menu button 14b constituting the monitor switch, a switch of the content selection / change button 14c, and a mode switching button on the display unit 14f of the monitor 14 A warning display indicating that the operation of the switch 14d and the switch of the decision button 14e is invalid, for example, “the monitor SW operation is invalid” is switched to the “partial display” and displayed.

The controller 14a determines that the key switch 20 is turned on by the key switch determination unit, determines that the engine is in a driving state by the engine drive determination unit, and turns off the gate lock switch 22 in the gate lock determination unit. When it is determined that the switch is selected, the operation of the switch of the menu button 14b, the switch of the content selection / change button 14c, the switch of the mode switching button 14d, and the switch of the decision button 14e constituting the monitor switch is validated. As shown in FIG. 2, the normal screen is displayed on the display unit 14 f of the monitor 14.

Further, the control device 14a monitors the monitor switch when the key switch 20 is not turned on by the key switch discriminating unit, that is, when the engine drive discriminating unit determines that the engine is not in the driving state. As shown in FIG. 3, the operation of the switch of the menu button 14b, the switch of the content selection / change button 14c, the switch of the mode switching button 14d, and the switch of the decision button 14e is displayed as shown in FIG. Display a normal screen.

Next, the processing procedure in the control device 14a of the monitor 14 provided in the present embodiment will be described based on the flowchart of FIG.

Now, for example, when the operator raises the gate lock lever 13 and turns off the gate lock switch 22, that is, the supply of pressure oil from the hydraulic pump to the drive circuit is stopped, the traveling body 1, the revolving body 2, and Assume that the operator is seated in the driver's seat 8 in a state where the work device 3 cannot be driven, and the engine is driven by inserting an engine key into the key hole and turning it. In addition, with the gate lock lever 13 raised as described above, any of the menu button 14b, the content selection / change button 14c, the mode switching button 14d, and the decision button 14e is operated to activate the corresponding monitor switch. Shall.

[Step S1] Based on the signal output from the key switch 20, whether or not the key switch 20 is on is determined by the key switch determination unit of the control device 14a. Now, it is determined that the key switch 20 is on, and the process proceeds to step S2. When the key switch determining unit determines that the key switch 20 is not on, that is, off, the process proceeds to step S4.

[Step S2] Based on the signal output from the rotation speed sensor 21 by the engine drive determination unit of the control device 14a, it is determined whether or not the engine is in a driving state. Now, it is determined that the engine is in a driving state, and the process proceeds to step S3. When it is determined that the engine is not in the driving state, the process proceeds to step S4.

[Step S3] Based on a signal output from the gate lock switch 22 by the gate lock determination unit of the control device 14a, it is determined whether or not the gate lock lever 13 is raised and the gate lock switch 22 is in an OFF state. Since the gate lock lever 13 is now raised and the gate lock switch 22 is off, the process proceeds to step S4. When it is determined that the gate lock lever 13 is lowered and the gate lock switch 22 is turned on, the process proceeds to step S6.

[Step S4] One of the switch of the menu button 14b, the switch of the content selection / change button 14c, the switch of the mode switching button 14d, and the switch of the decision button 14e constituting the monitor switch in the monitor switch determination unit of the control device 14a It is determined whether or not an operation has been performed. Now, for example, it is determined that any one of the switch of the menu button 14b, the switch of the content selection / change button 14c, the switch of the mode switching button 14d, and the switch of the decision button 14e is operated, and the process proceeds to step S5. If it is determined that none of the switch of the menu button 14b, the switch of the content selection / change button 14c, the switch of the mode switching button 14d, or the switch of the decision button 14e is operated, the process returns to step S1.

[Step S5] The control device 14a displays according to the operation of the corresponding monitor switch among the switch of the menu button 14b, the switch of the content selection / change button 14c, the switch of the mode switching button 14d, and the switch of the decision button 14e. Is displayed on the display unit 14f of the monitor 14, as shown in FIG.

If the engine is driven and the operator seated in the driver's seat 8 lowers the gate lock lever 13 and turns on the gate lock switch 22, that is, allows the supply of pressure oil from the hydraulic pump to the drive circuit, Any of the menu button 14b, the content selection / change button 14c, the mode switching button 14d, and the determination button 14e is operated in a state where the traveling body 1, the revolving body 2, and the work device 3 can be driven. Assume that the switch is activated. At this time, the determination of the gate lock determination unit in step S3 described above becomes no, and the process proceeds to step S6.

[Step S6] The control device 14a generates a warning sound indicating that the operation of the monitor switch is invalid, for example, a buzzer sound. Next, the process proceeds to step S7.

[Step S7] The control device 14a invalidates the operation of all the switches of the menu button 14b, the content selection / change button 14c, the mode switching button 14d, and the decision button 14e that constitute the monitor switch. Then, a specific display of a part of the normal screen on the display unit 14f of the monitor 14 is stopped, and a warning display is performed instead. For example, as shown in FIG. 4, “monitor SW operation is invalid” is displayed on the display unit 14f.

After the processing of step S5 and step S7, the processing of the control device 14a ends.

In the present embodiment configured as described above, the engine is driven and the gate lock lever 13 is lowered, and the pressure oil from the hydraulic pump drives the driving system such as the traveling body 1, the revolving body 2, and the work device 3. In a state in which it can be supplied to the drive circuit that drives the control circuit 14a, the control device 14a switches the menu button 14b, the content selection / change button 14c, the mode switching button 14d, and the decision button 14e that constitute the monitor switch Is disabled, and some specific displays on the normal screen of the monitor 14 are stopped. That is, it is possible to alert the operator that the function of the monitor 14 is limited and the monitor 14 cannot be operated normally. Thereby, it is possible to suppress the operator's arm or hand from touching the

operation devices

10a, 10b, 12a, 12b by the screen operation of the monitor 14, and to suppress the malfunction of the traveling body 1, the revolving body 2, and the work device 3. Can do.

Further, in this embodiment, the operation of the switch of the menu button 14b, the switch of the content selection / change button 14c, the switch of the mode switching button 14d, and the switch of the decision button 14e constituting the monitor switch is invalidated by the control device 14a. In this case, a part of specific display on the normal screen of the monitor 14 is stopped, and instead, a warning display indicating invalidity is displayed on the display unit 14f of the monitor 14 to generate a buzzer sound as a warning sound. Therefore, when the engine is driven and the gate lock lever 13 is lowered, it is possible to strongly alert the operator through the eyes and ears that the monitor 14 cannot be operated.

In the above-described embodiment, the control device 14a is provided in the monitor 14, but a configuration in which the control device 14a is provided separately from the monitor 14 may be employed.

Further, although the above-described embodiment is configured by a mini excavator provided with a canopy, the present invention can also be applied to a small construction machine such as a mini excavator provided with a cab.

DESCRIPTION OF SYMBOLS 1 Traveling body 2 Revolving body 3 Working device 4 Boom 4a Boom cylinder 5 Arm 5a Arm cylinder 6 Bucket 6a Bucket cylinder 7 Driver's cab 8 Driver's seat

10a Operating device

10b Operating device 12a Operating device 12b Operating device 13 Gate lock lever 14 Monitor

14a Control Device

14b Menu button 14c Contents selection / change button 14d Mode switching button

14e Determination button

14f Display unit 15 Counterweight 16 Engine room 20 Key switch 21 Rotation speed sensor 22 Gate lock switch

Claims

A traveling body, a revolving body disposed on the traveling body, a working device attached to the revolving body, a driver seat provided on the revolving body, and an engine housed below the driver seat. An engine room, a hydraulic pump that is driven by the engine to supply pressure oil to a driving circuit that drives the traveling body, the swivel body, and the working device, and the traveling body disposed around the driver seat. An operation device for operating the revolving structure and the working device, a monitor disposed on the right front side of the driver's seat, and a drive from the hydraulic pump disposed at the entrance to the driver's seat on the revolving structure. A gate lock lever that can rotate in the vertical direction to operate a gate lock switch that outputs a signal that stops or allows the supply of pressure oil to the circuit,
When the gate lock lever is raised, the gate lock switch is turned off, the supply of pressure oil from the hydraulic pump to the drive circuit is stopped, and when the gate lock lever is lowered, the gate lock switch In a small construction machine that is turned on and is allowed to supply pressure oil from the hydraulic pump to the drive circuit,
When the engine is in a driving state and the gate lock lever is in a lowered state, the operation of a monitor switch provided in the monitor is invalidated. A small construction machine comprising a control device for stopping a specific display.
The small construction machine according to claim 1,
The control device includes an engine drive determining unit that determines whether or not the engine is in a driving state, and a gate lock determining unit that determines whether or not the gate lock switch is turned off by raising the gate lock lever. And
When the engine drive determining unit determines that the engine is in a driving state, and the gate lock determining unit determines that the gate lock switch is not turned off, the operation of the monitor switch is invalidated. A small construction machine characterized by stopping a specific display on a part of a normal screen of a monitor.
The small construction machine according to claim 2,
When the engine drive determining unit determines that the engine is in a driving state, and the gate lock determining unit determines that the gate lock switch is not turned off, A small construction machine that displays a warning that the operation of the monitor switch is invalid.
The small construction machine according to claim 2,
When the engine drive determining unit determines that the engine is in a driving state and the gate lock determining unit determines that the gate lock switch is off, the control device A small construction machine characterized in that an operation is validated and a normal screen is displayed on the monitor.
The small construction machine according to claim 4,
When the engine drive determining unit determines that the engine is not in a driving state, the control device validates the operation of the monitor switch and displays a normal screen on the monitor.