JPH0274446A - Outrigger drive control device - Google Patents

Abstract

PURPOSE:To improve the operating property by extending or contracting a pair of outriggers simultaneously responding to the operational direction of an operation lever, while operating the pair of outriggers independently when the operation lever is operated in the four areas divided in the operational direction and in the direction square to the operational direction. CONSTITUTION:When an operation lever 31 is slided to the left side or to the right side of the vehicle from the neutral position, a switch SWL or a switch SWR is ON through a pressing member 33a, and when it is slided to the front side or to the rear side of the vehicle, a potentiometer 34F or a potentiometer 34R is operated and a signal responding to the amount of the operation is output. Moreover, when the operation lever 31 is slided to the area I, for example, of the four areas divided in the left and the right direction, and in the front and the rear direction, the potentiometer 34F and the switch SWR are made to operate together. Depending on the outputs of the potentiometers 34F and 34R, and the switches SWL and SWR, control valves 43L and 43R are converted, and the left side and the right side outriggers 14 and 15 are extended or contructed simultaneously or independently.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a drive control device for outriggers attached to construction machines such as hydraulic excavators and industrial vehicles such as aerial work vehicles.

B. Prior Art For example, a hydraulic excavator with outriggers is known in which a pair of left and right outriggers are brought into contact with the ground to maintain the vehicle in a stable state.

This type of outrigger has conventionally been driven by a hydraulic circuit as shown in FIG. 8, for example.

In FIG. 8, the operating levers 51 and 52 can be swung in the longitudinal direction of the vehicle, for example, and when the operating lever 51 is swung forward or backward, the potentiometer 53
a or 53b is operated, thereby switching the proportional electromagnetic control valve 54 in a predetermined direction. As a result, the hydraulic pump 55
The oil discharged from the piston rod 56 is guided into the bore chamber 56b or rod chamber 56c of the hydraulic cylinder 56 in an amount corresponding to the stroke amount of the proportional electromagnetic control valve 54, and the left outrigger attached to the tip of the piston rod 56a is driven to expand and contract. . These driving speeds depend on the amount of swing operation of the operating lever 51.

The outrigger attached to the right hydraulic cylinder 59 is similarly extended and contracted by the operating lever 52.

C0 Problems to be Solved by the Invention However, in the above configuration, one operating lever is required for each outrigger, so for example, in a vehicle equipped with two pairs of left and right outriggers, as many as four operating levers are required. A lever must be provided, which requires a large space and increases manufacturing costs. Further, for example, when operating the left and right outriggers at the same time, two operating levers must be operated at the same time, resulting in poor operability.

An object of the present invention is to provide an outrigger drive control device that requires less installation space, reduces costs, and improves operability.

Means for Solving the Problems 00 To be explained with reference to FIG. 1 showing an embodiment, the present invention comprises a pair of hydraulic cylinders 12 and 13 that respectively drive a pair of outriggers 14 and 15 (FIG. 3), and a hydraulic source. A pair of control valves 43L that respectively guide discharged oil from 42 to a pair of hydraulic cylinders 12.13.

The present invention is applied to an outrigger drive control device for construction machinery, which includes a control valve 43R and an operating lever 31 that switches between these control valves 43L and 43R.

The above-mentioned problem is that the operating lever 31 is operable in the entire circumferential direction, detects that the operating lever 31 is operated in a first direction and a second direction opposite to the first direction, and When the lever 31 is operated in any other direction, it is determined which of the four regions ■ to ■ divided by the first and second directions and a direction orthogonal to these directions the lever 31 is operated. and a pair of outriggers 14 depending on whether the operating lever 31 is operated in the first or second direction.
, 15 at the same time to extend or contract the control valve 43L.
, 43R, and the operating lever 31
It is equipped with a switching control means 41 that switches and controls control valves 43L and 43R to independently extend or contract the pair of outriggers 14 and 15, respectively, depending on which region is operated among the three regions ■ to ■. This is solved by

The detection means 34 detects that the operation lever 31 is operated in the first direction (for example, the front direction of the vehicle) or the second direction (for example, the rear direction of the vehicle). When detected by the SW, the switching control means 41 switches and controls the control valves 43L, j:3R depending on which direction the switch is operated, thereby simultaneously extending or contracting the pair of outriggers 14 and 15.

Further, when it is detected that the operating lever 31 has been operated in one of the four regions (■ to (■)), the switching control means 41 switches the control valve 43L depending on which region has been operated.

43R, thereby controlling the pair of outriggers 14.
, 15 are individually extended or contracted.

In the above-mentioned sections and section E, which describe the present invention in detail, figures of embodiments are used to make the present invention easier to understand, but the present invention is not limited to the embodiments.

F. Embodiment 1 First Embodiment A first embodiment of the present invention will be described based on FIGS. 1 to 5.

FIG. 2 shows a hydraulic excavator with an outrigger, in which (a) is a side view and (b) is a view taken from line bb.

This hydraulic excavator consists of a lower traveling body 1 and an upper revolving body 2. The lower traveling body 1 has a front outrigger device 10 on the rear side of the front axle 3 and a rear outrigger device 20 on the rear side of the rear axle 4. each installed. Outrigger equipment! 10
．． Reference numeral 20 is for holding the main body of the hydraulic excavator in a stable state during work, and is constructed as shown in FIG. 3, for example. Although FIG. 3 shows only the front outrigger device 10, the rear left outrigger device 20 is also constructed in the same manner.

In FIG. 3, a pair of hydraulic cylinders 12 and 13 are provided inside the outrigger body 11, and left and right outriggers 14 and 15 are attached to the tips of piston rods 12a and 13a, respectively.

The left and right outriggers 14, 15 include a piston rod 12a,
Each of them can be swung by expanding and contracting 13b, and a grounding part 16, 17 that is grounded to the ground is attached to the tip of each of them. During work, both outriggers 14 and 15 are driven to extend by a predetermined amount depending on the shape of the ground, and the ground contact portion 16.
17 is grounded, and when the vehicle is running, the outriggers 14 and 15 are contracted to prevent the grounding portions 16 and 17 from touching the ground.

These outriggers 14.15 are shown in Figures 4(a) and (b).
) is driven by operating the operating lever 31 shown in FIG. This operating lever 31 is provided in the operator's cab of the upper revolving structure 2 (FIG. 2(a)), and is connected to a universal joint 32.
This enables swing operation in all circumferential directions. A suppressing member 33 is fitted onto the lever 31, and this pressing member 33
are each integrally provided with four pressing portions 33a that protrude in the longitudinal and lateral directions of the vehicle with the axis of the lever 31 as the center. A pair of potentiometers 34F and 34R are provided below the front and rear suppression sections 33a, respectively, and a pair of switches SWL and SWR are provided below the left and right suppression sections 33a, respectively. In addition, the fourth
In Figure (a), illustration of the pressing portion 33 is omitted.

LE the operating lever 31 from the neutral position shown in FIG.

When the vehicle is rocked in the left or right direction (RI right direction third and fourth direction), the suppression portion 33a (FIG. 4 (
b)) When the switch SWL or S is operated,
Each WR turns on and outputs a high level signal, and when returned to the neutral position, each turns off and outputs a low level signal. In addition, the operation lever 31 is set to FF and R as shown in the figure.
When the vehicle is rocked in the right direction, that is, in the front or rear direction (first direction or second direction), the potentiometer 34F or 34R is operated by the suppressor 33a (not shown), and the potentiometer 34F or 34R is operated according to the amount of operation. A signal is output.

Further, when the operating lever 31 is swung to the area (■) among the four areas 1 to (■) divided into the right direction of LE, RI, and the right direction of FF, RR, the potentiometer 34F and the switch SWR are
When both are operated and swung to region (3), potentiometer 34F and switch SWL are operated. Further, when it is swung to the region (2), the potentiometer 34R and the switch SWL are operated, and when it is swung to the region (2), the potentiometer 34R and the switch SWR are operated. These potentiometers 34F, 34R.

Output signals from the switches SWL and SWR are input to the controller 41 shown in FIG. 1, respectively.

In FIG. 1, oil discharged from the hydraulic pump 42 is guided to the above-mentioned outrigger driving hydraulic cylinders 12 and 13 via a pair of proportional electromagnetic control valves 43L and 43R, respectively.

The controller 41 is a potentiometer 34F.

34R and the switches SWL and SWR, and outputs a switching signal based on the signals input from the switches SWL and SWR, and controls the predetermined control valves 43L,
43R is switched to the A position or B position by a predetermined amount. As a result, oil is discharged from the hydraulic pump 42 at a flow rate corresponding to the stroke amount into the bore chambers 12b and 1 of the hydraulic cylinders 12.13.
3b or rod chambers 12c, 13c, the piston rods 12a, 13a expand and contract, and as a result, the left and right outriggers 14, 15 are driven.

Although not shown, the rear outrigger device 2o is also provided with an operating section similar to that shown in FIG. 4 and a hydraulic circuit as shown in FIG. Drive controlled.

In the configuration of the above embodiment, the potentiometer 34F
, 34R, switches SWL, and SWR constitute a detection means, and the controller 41 constitutes a switching control means, respectively.

Next, the drive control of the outriggers by the controller 41 will be explained based on the flowchart in FIG. Note that this program is for driving and controlling the front outrigger device 10.

First, in step S1, the controller 41 controls the potentiometers 34F, 34R and the switches SWL, SW.
The output signal from R is read, and then in step S2 it is determined whether the potentiometer 34F is being operated based on the presence or absence of a signal output from the potentiometer 34F. If a negative determination is made, the process proceeds to step S3, where it is similarly determined whether the potentiometer 34R is being operated.

If step S3 is negative, that is, if both potentiometers 34F and 34R are not operated, the surface control valve 43L is activated in step S8.

Switch 43R to the neutral position (N position). As a result, all of the oil discharged from the hydraulic pump 42 returns to the tank via the surface control valves 43L and 43R, and the hydraulic cylinder 12.13 is not expanded or contracted, and both outriggers 14.15 are not driven. Here, both potentiometers 34F and 34R are not operated when the operation lever 31 is in the neutral position shown in FIG. 4 or when it is operated in the LE and RI force directions.

Further, when step S3 is determined, the process proceeds to step s4,
It is determined whether the switch SWL is on or not.

If step S4 is denied, switch S is set in step s5.
It is determined whether WR is on or not, and if the determination is negative, the process advances to step S9. A negative result in step S5 indicates that only the potentiometer 34R has been operated, that is, the lever 31 has been operated to swing in the RR force direction, and in this case, in step S9, the control valves 43L, 43R
is switched to the B position by an amount corresponding to the operation amount of the potentiometer 34R. As a result, the oil discharged from the hydraulic pump 42 is transferred to the rod chambers 12c of the hydraulic cylinders 12, 13 in an amount corresponding to the stroke amount of the potentiometers 34F, 34R.
13c, the piston rods 12a and 13a contract, and the left and right outriggers 14.15 (FIG. 3) are simultaneously driven to contract.

The driving speed at that time depends on the amount of operation of the operating lever 31.

Further, if step S5 is affirmed, step 810
Proceed to. The fact that step S5 has been determined indicates that both the potentiometer 34R and the switch SWR have been operated, that is, the operating lever 31 has been operated to the area () shown in FIG. At step SIO, the control valve 43L is switched to the N position, and the control valve 43R is switched to the B position. As a result, the oil discharged from the hydraulic pump 42 is transferred to the hydraulic cylinder 13 in the same manner as described above.
The piston rod 13a is guided into the rod chamber 13c, and the right outrigger 15 is driven to contract. Also, since the control valve 43L has been switched to the neutral position, the control valve 43L
All the discharge oil of the hydraulic pump 42 led to the side returns to the tank, and therefore the piston rod 12 of the hydraulic cylinder 12
a does not extend or contract, and the left outrigger 14 is not driven.

Furthermore, if step S4 is affirmed, that is, the operating lever 31 is swung to the region ■ and the potentiometer 34R is
and switch SWL are operated together, step 8
Proceed to step 11. In step Sll, the control valve 43R is switched to the N position, and the control valve 43L is switched to the B position. Contrary to the above, the piston rod 12a of the hydraulic cylinder 12 contracts, the left outrigger 14 is driven toward the contracted position, and the hydraulic cylinder 13 does not extend or contract, but the right outrigger 1
5 is not driven.

On the other hand, if step S2 is affirmed, the process proceeds to step S6, where it is determined whether switch SWL is on. If it is denied in step S6 that the switch SWL is turned on, and further that the switch SWR is turned on in step S7, it is determined that the operating lever 31 has been swung in the FF direction and only the potentiometer 34F has been operated. If it is determined, the process proceeds to step S12, and the recontrol valves 43L and 43R are switched to the human position according to the amount of operation. As a result, the oil discharged from the hydraulic pump 42 is transferred to the hydraulic cylinder 12.13 by an amount corresponding to the stroke amount via the recontrol valves 43L and 43R.
The piston rod 12a is guided into the bore chambers 12b and 13b of
, 13a are each extended. As a result, both outriggers 14 and 15 are driven to extend at the same time.6 Also, if step S7 is determined, that is, the operating lever 31 is swung to the region (3) and the potentiometer 34-
When F and switch SWR are operated together,
In step S13, the control valve 43L is switched to the N position, and the control valve 43R is switched to the A position. As a result, the piston rod 12a of the hydraulic cylinder 12 is not driven, only the piston rod 13a of the hydraulic cylinder 13 is extended, and only the right outrigger 15 is driven to extend.

Further, if step s6 is affirmed, the bottom operating lever 31 is swung to the region ■, and the potentiometer 34 is
When F and switch SWL are operated, the control valve 43R is switched to the N position and the control valve 43L is switched to the B position, contrary to the above.

As a result, only the piston rod 12a of the hydraulic cylinder 12 is extended, and only the left outrigger 14 is driven to extend.

After any of the above steps 88 to S14, the process returns to step s1.

According to the above, the operation for simultaneously driving the left and right seven outriggers 14 and 15, and the operation for driving one outrigger 14.
Alternatively, since the operation for independently driving the outriggers 15 can be performed with one operating lever 31, there is no need to provide one operating lever for each outrigger as in the conventional case.

In this embodiment, the operation lever 31 is moved in the front-rear direction (FF,
The means for detecting that the RR has been operated in the right direction is composed of a pair of potentiometers 34F and 34R, and
E, RI A pair of switches SWL is used to detect that the RI is operated in the right direction.

Although an example is shown in which the SWR is used, all of these means may be formed using potentiometers or switches. However, if everything is configured with switches, the outrigger 1
The driving speeds 4 and 15 are constant regardless of the amount of operation of the operating lever 31.

-Second Embodiment- In the above description, the controller 41 controls the control valves 43L, 43
An example in which the R switching control is performed has been shown. Next, a second embodiment in which this switching control is performed using hydraulic pressure will be described based on FIGS. 6 and 7.

Note that the same parts as in FIGS. 1 and 4 are given the same reference numerals.

FIG. 6 corresponds to FIG. 4 (,) described above, and the hydraulic pilot valves 51F and 51R are moved in the left and right directions by swinging the operating lever 31 in the front and rear directions (FF, RR right direction). (LE.

The hydraulic switching valves 52L and 52R are operated by the rightward rocking of the RI. Further, when the operating lever 31 is operated to the region I, the pilot valve 51F
When the switching valve 52R is operated in the region H, the pilot valve 51F and the switching valve 52L are operated, and when the switching valve 52R is operated in the region ■, the pilot valve 51R and the switching valve 52L are operated.
However, when the valve is operated to the region (3), the pilot valve 51R and the switching valve 52R are respectively operated. The pilot valves 51F and 51R output hydraulic pressure proportional to the amount of operation.

FIG. 7 is a hydraulic circuit diagram of this embodiment, in which oil discharged from the hydraulic source 61 is transferred to the hydraulic pilot type control valve 65L via the pilot valve 51F and the switching valves 67a and 68a described above.
, 65R's pilot boat 5La, 65Ra, and the control valve 65L, 65R's pilot boat 65Lb via the pilot valve 51R and switching valves 67b, 68b.
.

65Rb respectively.

The switching valves 67a, 67b, 68a, and 68b are normally switched to the communication position by spring force, and the pilot valve 51
F and 51R are communicated with control valves 65L and 65R, respectively. When the switching valves 52L and 52R are operated by the operating lever 31, the switching valves 67a to 68b are switched to the blocking position where the oil discharged from the hydraulic source 61 blocks both of them.

Now, for example, if the operating lever 31 is swung in the FF direction,
As described above, the pilot valve 51F is operated, and the amount of oil discharged from the hydraulic source 61 is applied to the control valve 6 in an amount corresponding to the amount of operation.
5L, 65R pilot boat 65La, 65Ra
As a result, the control valves 65L and 65R are respectively switched to the A position. As a result, the hydraulic pump 42
The oil discharged from the piston rod 12a is guided into the bore chambers 12b, 13b of the hydraulic cylinder 12.13 in an amount corresponding to the stroke amount thereof, respectively.

13a is extended, and the left and right outriggers 14 and 15 are simultaneously driven to extend. The driving speed depends on the amount of swing operation of the operating lever 31.

Further, when the operating lever 31 is swung in the RR force direction, the pilot valve 51R is operated, and the oil discharged from the hydraulic source 61 is sent to the pylon 1 of the control valves 65L, 65R through the port 65Lb,
65Rb respectively.

The control valves 65L and 65R are switched to the B position. Along with this, the oil discharged from the hydraulic pump 42 is transferred to the hydraulic cylinder 12.1.
The piston rods 12a, 13a contract and the outriggers 14, 1
5 are simultaneously driven to contract.

Further, when the operating lever 31 is swung to the region I, the pilot valve 51F and the switching valve 52R are operated, and the switching valve 68a is switched to the cutoff position by the oil discharged from the hydraulic source 61.

Therefore, the oil discharged from the hydraulic power source 61 is not guided to the control valve 65L, but only to the pilot boat 65Ra of the control valve 65R. As a result, the control valve 65R is switched to the A position, the oil discharged from the hydraulic pump 42 is guided to the bore chamber 13c of the hydraulic cylinder 12, and the right outrigger 15 is driven to extend. Since the control valve 65L is in the N position, all the oil discharged from the hydraulic pump 42 guided to the control valve 65L side returns to the tank and is not guided to the hydraulic cylinder 12, so the left outrigger 14 is not driven.

Furthermore, when the operating lever 31 is swung to the region (3), the pilot valve 61F and the switching valve 52L are operated, and the switching valve 67a is switched to the cutoff position by the oil discharged from the hydraulic source 61. As a result, the oil discharged from the hydraulic source 61 is transferred to the control valve 65.
It is guided only to the L pilot boat 65La, and only the left outrigger 14 is driven to extend by an operation opposite to that described above.

Further, when the operating lever 31 is swung to the region (3), the pilot valve 51R and the switching valve 52L are operated, and the switching valve 67b is switched to the cutoff position by the oil discharged from the hydraulic source 61. Therefore, the oil discharged from the hydraulic source 61 is not guided to the control valve 65R, but only to the pilot boat 65Lb of the control valve 65L. As a result, the control valve 65L is switched to the B position, the oil discharged from the hydraulic pump 42 is guided to the rod chamber 12c of the hydraulic cylinder 12, and the left outrigger 14 is driven to contract. Since the control valve 65R is in the N position, the hydraulic cylinder 1
3 piston rod 13a does not extend or contract, and the right outrigger 1
5 is not driven.

Further, when the operating lever 31 is swung to the region (3), the pilot valve 51R and the switching valve 52R are operated.

The switching valve 68b is switched to the cutoff position by the oil discharged from the hydraulic power source 61. As a result, the oil discharged from the hydraulic source 61 is transferred to the pilot boat 65 of the control valve 65R. Guided only by Rb,
Only the right outrigger 15 is driven to contract by an operation opposite to that described above.

According to the above second embodiment, 1
At the same time, use the operating lever 31 to operate the outriggers 14 and 15.
Alternatively, they can be individually driven to extend and contract.

In addition, one or more 1st. In the second embodiment, the operating directions (first and second directions) of the operating levers for simultaneously driving the left and right outriggers 14 and 15 are the front and back directions, but the first and second directions are not limited to this. The second direction is any two opposite directions other than the front-rear direction, and the third direction is any two opposite directions other than the front-back direction. The fourth direction may be two directions perpendicular to this direction.

Further, the present invention can also be applied to a drive control device for an outrigger provided in a construction machine or an industrial vehicle other than a hydraulic excavator.

G0 Effects of the Invention According to the present invention, when the operation lever is operated in the first direction (for example, the front direction of the vehicle) or the second direction opposite to this (for example, the rear direction of the vehicle), the A pair of outriggers are simultaneously driven to extend or contract, and the first
．． When the operating lever is operated in four areas divided by the second direction and a direction perpendicular to these directions (for example, the left-right direction of the vehicle), the pair of outriggers will each extend or retract independently depending on the area of operation. Since the outriggers are driven by a single operating lever, a pair of outriggers can be driven at the same time or independently.Compared to conventional methods, the installation space for operating levers can be reduced, manufacturing costs can be reduced, and operation has become easier. Improves sex.

[Brief explanation of the drawing]

1 to 5 show a first embodiment of the present invention, and FIG. 1 is an overall configuration diagram of an outrigger drive control device according to the present invention,
Fig. 2(a) is a side view of a hydraulic excavator with an outrigger;
FIG. 2(b) is a view taken along line bb, FIG. 3 is a front view showing the outrigger, and FIG. 4(a) is a top view showing the operating section.
FIG. 4(b) is a sectional view taken along the line bb, and FIG. 5 is a flow chart 1 showing the processing procedure for outrigger drive control. 6 and 7 show a second embodiment of the present invention, FIG. 6 is a top view of the operating section, and FIG. 7 is a hydraulic circuit diagram showing the overall configuration 41. FIG. FIG. 8 is a hydraulic circuit diagram showing the overall configuration of a conventional outrigger drive control device. 12.13: Hydraulic cylinder 14.15: Outrigger 31: Operation lever 34F, 34R: Potentiometer 41: Controller 42: Hydraulic motor 43L, 43R: Control valve SWL, SWR: To switch

Claims (1)

[Scope of Claims] 1) A pair of hydraulic cylinders that respectively drive a pair of outriggers, a pair of control valves that respectively guide oil discharged from a hydraulic source to the pair of hydraulic cylinders, and switching operation of these control valves. An outrigger drive control device comprising a control lever, wherein the control lever is operable in a circumferential direction, and the control lever is operated in a first direction and a second direction opposite to the first direction. At the same time, if the control lever is operated in a direction other than that, the control lever is operated in any of the four regions defined by the first and second directions and a direction orthogonal to these directions. a detection means for detecting whether the operating lever is operated; and switching the control valve to simultaneously extend or retract the pair of outriggers depending on which direction of the first and second directions the operating lever is operated. and switching control means for controlling the control valve to independently extend or retract each of the pair of outriggers depending on which region of the four regions the operating lever is operated. An outrigger drive control device comprising: 2) The detection means includes a pair of operation amount detectors that detect the operation amount when the operation lever is operated in the first and second directions, respectively; a pair of switches that turn on when operated in the third and fourth directions perpendicular to the direction,
The switching control means switches and controls each of the pair of control valves to extend or retract the pair of outriggers at a speed corresponding to the operating amount of the operating lever detected by the operating amount detector. The outrigger drive control device according to claim 1.