KR20120003173A - Apparatus for selectively controlling the optionactuator in excavator - Google Patents

Abstract

PURPOSE: An apparatus for controlling an option actuator of an excavator is provided to reduce fuel costs by automatically stopping an option device when pump pressure flowing to the option device is over relief pressure. CONSTITUTION: An apparatus for controlling an option actuator of an excavator comprises a work mode selection unit(108), an option valve(130), first and second cut valves(122,124), a switch, and a control unit(110). The work mode selection unit selects the mode of an option device. The option valve sends hydraulic pressure from a main pump to the option device. The first and second cut valves cut off pilot pressure of a pilot pump or transfers the pilot pressure to the option valve. The switch transmits a first operation signal or a second operation signal to the control unit. The control unit sends first operation currents or second operation currents to the cut valves.

Description

Optional work machine control device of excavator {APPARATUS FOR SELECTIVELY CONTROLLING THE OPTIONACTUATOR IN EXCAVATOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optional worker control device of an excavator, and more particularly, to an optional worker control device of an excavator that can operate a repetitive operation with a switch button when using a 2-Way option device such as a crusher or a multiprocessor.

Excavator is a construction machine that carries out the work of moving equipment as civil engineering, construction, excavation work digging ground, loading work carrying earth and sand, shredding work dismantling building, stopping work to clean up the ground. It consists of all the devices which consist of an upper swing body mounted on a sieve and a traveling body and rotating 360 degrees, and a boom arm bucket.

Excavators are categorized into crawler crawler excavators and tire wheel excavators according to the driving method of the traveling body. Since crawler excavators are more stable and more productive than wheeled excavators, they are widely used on each job site, ranging from 1 ton to 100 tonnes of machine weight.Wheeled excavators are supported by tire support methods compared to crawler excavators. Its stability is poor, but it is possible to travel on the road without transport trailers, and is mainly used for work sites that require frequent work and movement.

Excavators can be used by replacing the buckets mainly used for excavation work with optional equipment such as breakers, crushers, and augers, depending on the type of work. That is, as an optional function of the excavator, the front bucket can be removed and the breaker, the crusher and the optional device can be installed to carry out operations such as crushing, cutting and conveying.

Among them, the crusher work is almost always done by moving the front. That is, since the crusher operation must be performed in parallel with the front operation and the operation of the flow control lever, the operation speed may be slow and the operation may feel difficult. In addition, repeated opening and closing of the crusher increases the work fatigue of the user, thereby reducing the work efficiency and causing a risk of human injury due to a safety accident.

The present invention was devised to solve the above problems, and an object of the present invention is to increase the user's convenience by operating a repetitive operation when using a 2-Way option device such as a crusher or a multiprocessor with a single switch button. It is to provide an optional worker control device of the excavator which can be improved.

An optional work machine control device of an excavator according to the present invention includes a working mode selection unit for selecting an operation of an optional device in an automatic mode or a manual mode, and sends the operating hydraulic pressure of the main pump to the optional device, and in a first direction according to a pilot hydraulic signal. Or an option valve for switching in a second direction, a cut valve for shutting off or transferring a pilot hydraulic pressure to the option valve, and a flow control lever, wherein the option valve is configured in the first direction or the first direction when the automatic mode is selected. A switch unit for transmitting a first operation signal or a second operation signal to be switched in two directions to the control unit; and sending a first operating current or a second operating current to the cut valve, and waiting for the next signal from the switch. And the controller for maintaining the switched position of the option valve.

An operation mode selector for selecting the operation of the option device in the automatic mode or the manual mode, an option valve for transmitting the operating hydraulic pressure of the main pump to the option device, a cut valve for shutting off or transferring the pilot hydraulic pressure to the option valve, and a switch And a control unit configured to send a first operating current or a second operating current to the cut valve upon input of the controller, when the control unit sends the first operating current or the second operating current to the cut valve. The position of is switched so that the option device performs a first operation or a second operation.

Here, the control unit is characterized in that when the operating hydraulic pressure of the main pump flowing to the option device is greater than the relief pressure to stop the current supply to stop the operation of the option device.

In addition, the switch is characterized in that provided separately to the flow control lever or using a breaker button.

As described above, since the present invention can operate a repetitive operation with one switching button when using a 2-Way option device such as a crusher or a multiprocessor, the convenience of the operator can be increased to improve the work efficiency.

In addition, when the crusher or the multi-processor 2-way option device is opened and closed, when the pump pressure flowing to the option device is higher than the relief pressure, the option device is automatically stopped to reduce unnecessary flow rate and thereby reduce fuel consumption.

In addition, the switch button may be separately provided in the flow control lever, but by using a breaker button that is not used in the operation of the crusher, the existing input device may be used, and the software may be implemented only by modifying the software to further develop hardware installation costs and the like. It has the advantage that it does not cost production.

1 is a control circuit diagram showing an optional work machine control device of an excavator according to an embodiment of the present invention.
2 is a flowchart illustrating a method for controlling an optional work tool of an excavator according to an exemplary embodiment of the present invention.
3 is a diagram illustrating a switch input flow according to automatic mode selection.

1 is a control circuit diagram showing an optional work machine control device of an excavator according to an embodiment of the present invention.

Referring to FIG. 1, an optional work controller of an excavator includes a setting unit 100, a work mode selection unit 108, first and second cut valves 122 and 124, an option valve 130, and first and second reliefs. Valves 142 and 144, and optional device 134. Although only the crusher 134 is shown as an option device in FIG. 1, the option device may be a 2-way option device such as a multiprocessor including a crusher.

The setting unit 100 selects a desired option device from the crusher 134 or the multiprocessor, and sets the pilot pressure of the pilot pump according to the selected option device. In this case, the first and second cut valves 122 and 124 cut or transmit the pilot hydraulic pressure of the pilot pump to the option valve 130. The first cut valve 122 is disposed between the left hydraulic part of the option valve 130 and the pilot pump, and the second cut valve 124 is disposed between the right hydraulic part of the option valve 130 and the pilot pump. Accordingly, the first and second cut valves 122 and 124 transfer the pilot hydraulic pressure of the set pilot pump to the left and right hydraulic parts of the option valve 130 to switch to either side of the option valve 130. In this case, the first and second cut valves 122 and 124 may be Electronic Proportional Pressure Reduce (EPPR) valves or solenoid valves.

The work mode selector 108 may select the automatic mode 112 or the manual mode 114 as the work mode of the option device 134. Manual mode 114 is a mode for adjusting the option device 134 through the flow control lever, automatic mode 112 is a mode that can automate the repetitive operation of the option device using a switch button.

In the automatic mode selection, the switch transmits a first operation signal or a second operation signal to the control unit 110 for the option valve 130 to switch in the first direction or the second direction. Preferably, the first operation signal may be an open (or close) operation signal, and the second operation signal may be a close (or open) operation signal. In addition, the switch button may be provided separately in the flow control lever, it is possible to use a switch button previously installed in the flow control lever. The breaker button can be used as a switch button because the breaker button is not used for crusher or multiprocessor operation.

The controller 110 controls the operation of the crusher 134 or the multiprocessor to be opened or closed whenever the switch button is pressed according to the automatic mode 112 selection. That is, the controller 110 may operate a 2-way option device such as the crusher 134 or the multiprocessor by only pressing a switch button. Specifically, when the first switch is input, the controller 110 sets the direction so that the crusher 134 or the multiprocessor can be opened (or closed) according to the first operation signal, and when the second switch is input, the controller 110 is In accordance with the second operation signal, the crusher 134 or the multiprocessor sets the direction to close (or open).

In other words, at the first switch input, the controller 110 sends the open current to the first and second cut valves 122 and 124 to switch the option valve 130 to the first position. At this time, the option valve 130 is switched to the first position, the hydraulic pressure from the main pump is supplied through the first port of the cylinder (not shown). Accordingly, the drive loader in the cylinder is raised to open the option device 134 connected with the cylinder. In addition, when the second switch is input, the controller 110 sends the close current to the first and second cut valves 122 and 124 so that the option valve 130 switches to the second position. At this time, while the option valve 130 is switched to the second position, the hydraulic pressure is supplied from the main pump through the second port of the cylinder (not shown). Accordingly, the drive loader in the cylinder is lowered to close the option device 134 connected with the cylinder. In this way, the option valve 130 receives the operating oil pressure of the main pump (not shown), and sends the operating oil pressure to the option device 134 according to the input of the switch. In addition, the controller 110 maintains the switched position of the option valve 130 until the next signal is input from the switch.

On the other hand, when the option device 134 moves to the end (when the option device is opened or closed to the end), the hydraulic pressure flowing to the option device 134 increases, and when the hydraulic pressure becomes higher than the relief pressure, the relief valves 142 and 144 open to the main pump. The flow rate is discharged. When the pressure sensor notifies the control unit 110, the control unit 110 does not send current to the first and second cut valves 122 and 124. Accordingly, when no current is supplied to the first and second cut valves 122 and 124, the spool of the option valve 130 is positioned in the neutral state, and the operation of the option device 134 is stopped. To this end, the first and second relief valves 142 and 144 are disposed and connected between the option valve 130 and the controller 110, and the pressure sensor is connected to each relief valve 142 and 144.

When the manual mode 114 is selected, the controller 110 may adjust the operation speed of the crusher 134 according to the adjustment of the flow control lever. Here, the manual mode 114 is a general method of adjusting the operation speed of the crusher 134 according to the degree of the flow control lever is pushed.

In other words, in the manual mode 114, the amount of current varies according to the adjustment of the flow control lever, and the pressure of the pilot pump is determined according to the amount of the current. At this time, the pressure of the pilot pump adjusts the flow rate by pushing the spool of the option valve 130. As the flow control lever is pushed in proportion to the amount of current to be sent, the more the flow control lever is pushed in, the more current flows, the more the flow rate flows while the spool is pushed, and the crusher operates faster.

2 is a flowchart illustrating a method for controlling an optional work tool of an excavator according to an exemplary embodiment of the present invention.

Referring to FIG. 2, first, a desired option device is selected from the crusher 134 or the multiprocessor in the setting unit 100, and then the pilot oil pressure of the pilot pump according to the selected option device is set. The selection with the crusher 134 will be described by way of example.

Thereafter, it is determined whether the option device is set to the automatic mode 112 or the manual mode 114. (S24) When the manual mode 114 is selected, the operation speed of the crusher 134 is adjusted according to the push amount of the flow control lever. Can be. When the automatic mode 112 is selected, a 2-way option device such as a crusher 134 or a multiprocessor is operated by simply pressing a switch button.

Each time the switch button is pressed according to the automatic mode 112 selection, the crusher 134 is opened or closed. (S26) At this time, the control unit 110 sets the opening and closing current according to the switch input. It is sent out to the second cut valves 122 and 124 to switch the option valve 130 to the first or second position. Accordingly, the crusher 134 connected with the option valve 130 is opened or closed. Here, in the present invention, the operation of the crusher is changed every time the switch is input. The description thereof will be described with reference to FIG. 4.

Finally, when the pump pressure flowing in the crusher 134 becomes more than the relief pressure for each opening / closing operation of the crusher 134, the controller 110 does not transmit current to the first and second cut valves 122 and 124. Accordingly, the operation of the crusher 134 is automatically stopped. (S30, S32)

3 is a flowchart illustrating a switch input according to automatic mode selection.

Referring to FIG. 3, first, when the switch is input (S40), the controller 110 sends an open current to the first and second cut valves 122 and 124 to switch the option valve 130 to the first position. Let's do it. Accordingly, the crusher 134 connected to the option valve 130 is opened. (S42, S44) It is determined whether there is a second switch input while the crusher 134 is open.

If there is no second switch input (S46), the controller 110 determines whether the pressure of the pump flowing to the crusher 134 is greater than the relief pressure.

If the pump pressure flowing to the crusher 134 is not greater than the relief pressure (S48), the crusher 134 is opened to the maximum until the relief pressure is greater than or equal to. That is, the controller 110 sends an open current to open the crusher 134 to the maximum until the pump pressure flowing to the crusher 134 becomes equal to or greater than the relief pressure. (S42, S44)

When the pressure flowing to the crusher becomes more than the relief pressure (S48), the crusher 134 is stopped in the maximum open state. That is, when the pump pressure flowing to the crusher becomes equal to or more than the relief pressure, the control unit 110 stops the current transmission (S50) and stops the operation of the crusher 134. (S52)

When there is a second switch input (S46), the controller 110 sends a closed current to the first and second cut valves 122 and 124 to switch the option valve 130 to the second position. Accordingly, the crusher 134 connected to the option valve 130 is closed. (S56, S58) It is determined whether there is a third switch input while the crusher 134 is closed.

If there is no third switch input (S60), the controller 110 determines whether the pressure of the pump flowing to the crusher is greater than the relief pressure (S62).

If the pressure of the pump flowing to the crusher 134 is not greater than the relief pressure (S62), the crusher 134 is closed to the maximum until the relief pressure is greater than or equal to. That is, the controller 110 sends a close current until the pump pressure flowing to the crusher 134 becomes equal to or greater than the relief pressure to close the crusher to the maximum (S56, S58).

When the pressure flowing to the crusher 134 becomes equal to or more than the relief pressure (S62), the crusher 134 is stopped in the maximum open state. That is, when the pump pressure flowing to the crusher 134 becomes equal to or more than the relief pressure, the control unit 110 stops the current transmission and stops the operation of the crusher 134. (S64, S66)

As such, if the pressure flowing to the crusher is greater than the relief pressure at each switch input step or at each opening / closing operation of the crusher 134, the controller 110 controls not to supply current to the first and second cursor valves 122 and 124. The operation of the crusher 134 is stopped.

The present invention has been described using the crusher as an example of the excavator optional device, but is not limited thereto, and is applicable to the optional device for all construction machines. Therefore, the embodiments disclosed in the specification of the present invention are not intended to limit the present invention. The scope of the present invention should be construed by the claims below, and all techniques within the scope equivalent thereto will be construed as being included in the scope of the present invention.

100: setting unit 108: working mode selection unit
110: control unit 112: automatic mode
114: manual mode 122,124: first and second cut valve
130: option valve 134: crusher
140: relief valve portion 142,144: first and second relief valve

Claims (3)

A working mode selection unit for selecting an operation of the option apparatus as an automatic mode or a manual mode;
An option valve which sends the operating hydraulic pressure of the main pump to the option device and switches in the first direction or the second direction according to a pilot hydraulic pressure signal;
A cut valve for shutting off or transferring a pilot hydraulic pressure to the option valve;
A switch unit provided separately from a flow control lever and configured to transmit a first operation signal or a second operation signal for switching the option valve in the first direction or the second direction when the automatic mode is selected;
And the control unit for sending a first operating current or a second operating current to the cut valve, waiting for the next signal from the switch, and maintaining the switched position of the option valve. . The method of claim 1,
And the control unit stops the current supply when the operating hydraulic pressure of the main pump flowing to the option device is equal to or greater than the relief pressure, thereby stopping the operation of the option device. The method of claim 1,
The switch is an optional work device control device of the excavator, characterized in that provided separately to the flow control lever or using a breaker button.

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