JPS58195642A - Switcher for steering handle of construction machine - Google Patents

Abstract

PURPOSE:To permit the safe running of a construction machine by a method in which when one of steering handles provided on the left and right sides of a construction is operated, the other one is locked. CONSTITUTION:A switcher consisting of solenoid valves 15-17 to switch the operations of a steering device is provided to an oil-pressure circuit in which pressure oil is supplied to a cylinder 5 from an oil tank 6 by using an oil-pressure pump 4 for steering handles 1 and 2 provided on the left and right sides of a construction machine. Any one of the left and right-handed steering handles 1 and 2 is locked by opening or closing the operating switch 18. For example, when a construction machine is operated by the steering handle 1, the operating switch 18 is turned ON, whereupon the solenoid valves 15-17 are switched, an oil-pressure circuit on the steering handle 1 side is kept as an open circuit, and the oil-pressure circuit on the other steering handle 2 side is kept as closed circuit. By this, even when the left and right-handed steering handles are operated concurrently, no interference occurs between them and also no danger caused by maloperation by two operators arises.

Description

[Detailed description of the invention] The present invention relates to improvements in steering handle devices for construction machinery.

More specifically, the present invention relates to a steering handle switching device that locks one of the steering handles provided on the left and right sides of a construction machine when the other is operated, thereby allowing safe travel.

Construction machinery, especially rollers for road compaction, must compact the road debris to the fullest on both the left and right sides of the road, and using only the right steering wheel is extremely dangerous when compacting road debris on the left side, so rollers are also used on the left side. A steering wheel is installed. However, conventionally, the steering handle device in this type of construction machinery is
As shown in the figure, one orbit roll 3, which is a type of hydraulic switching valve, is provided for the left and right steering handles 1 and 2, and one orbit roll 3 is provided for each axis of the left and right steering handles, Chain 1 is attached to sprocket 8, sprocket 7 installed on the sprocket trolley 3, and IO.
1 and 12, and operate the orbit roll 3 by the left and right steering handles] and the steering wheel 2. For example, the cylinder connected to the steering device that controls the direction of the front wheels. It was designed to operate. That is, the orbit roll 3 is operated by steering the steering handles J and 2, and the oil path is switched to the 5' side or 5' side of the cylinder 5 to transfer the pressure oil from the oil tank 6 with the oil LE pump 4. supply,
The piston rod 14 of the cylinder □ 5 is moved back and forth to steer the running direction of the machine.

In this way, the left and right steering wheels 1 and 2 are linked).

Since the mechanism is such that both the left and right pilots operate the steering handles l and 2 at the same time (in the case of ~, Ti,
It has the disadvantage that it is extremely dangerous, as it may force users to perform operations against their will. As a result, he was unable to take a vehicle inspection.

The present invention eliminates the above-mentioned drawbacks of the conventional steering wheel, and by providing a steering switching means for switching the operation of the steering device in the hydraulic circuit, it is possible to lock one of the left and right steering handles. .

The gist of this is that the steering handles installed on both the left and right sides of the construction machine control the direction of the wheels by operating orbit rolls that are interposed in a hydraulic circuit that supplies pressure oil from an oil tank to a cylinder using a hydraulic pump. In the rudder 11!2 handle device, which operates the cylinder connected to the steering device to perform steering, a steering switching means for switching the operation of the steering device is provided in the oil IE circuit,
Operation switch: Left and right steering handles by opening and closing ・11
1. A steering wheel switching device for construction machinery, characterized in that one side of the steering wheel is locked.

The present invention will be explained below using actual examples shown in FIGS. 2, 3, and 4. In FIGS. 2 and 3, the left and right steering handles 1 and 2 each serve as one orbit roll 3.3'.

Each of the orbit rolls 3.3'i [+] uses a hydraulic pump 4 to supply pressure oil from a tank 6 to a cylinder 5 fitted with a piston rod 14 connected to a steering device (not shown) that controls the direction of the wheels. The pressure oil in the cylinder 5 on the non-supply side is supplied to either the front chamber 5' side or the rear chamber 5 side formed by the freely fitted piston rod and the integral piston, and the pressure oil in the cylinder 5 on the non-supply side is sent to the oil tank 6. A solenoid valve 15 is provided upstream of the pressure oil supply side of these orbit rolls 3 and 3', and the pressure oil sent by the hydraulic pump 4 is passed through the solenoid valve. The switching operation causes the flow to be sent to either the orbit roll 3 or 3'. Furthermore, solenoid valves 16 and 17 are provided in the hydraulic circuit downstream of the orbit roll 3 and 3' on the side that supplies pressure oil to the cylinder 5, respectively.

These ML solenoid valves 15, 16, 17 are operated by operation switch 18.
For example, when the operation switch 18 is OFF as shown in FIG.
The side hydraulic circuit is an open circuit, whereas the hydraulic circuit of the steering handle 10111 is a closed circuit. Next, in the case of FIG. 3, the operation switch 18 is in the ON state. The oil field circuit on the steering wheel 71 side is an open circuit, and the hydraulic circuit on the steering wheel 2 side is a closed circuit.

Note that 13 is a relief valve, and 19 is an m source.

FIG. 4 shows another embodiment. In the case of this actual sister example, electromagnetic clutches 20 and 21 are installed on each axis of the left and right steering handles l and 2.
are respectively thrown, and the operation switch 18 is set to 0N-O.
Depending on the FF, one of the electromagnetic clutches is opened and the other electromagnetic clutch is closed. In the illustrated state, the electromagnetic clutch 21 is closed and the vehicle is steered by the steering wheel 2. The rest of the configuration is the same as that of the conventional example, so a description thereof will be omitted.

Note that 13 is a relief valve.

Next, the second function of this device will be explained. First, when the operation switch 18 is turned OFF as shown in Fig. 2, the solenoid valve ■5.16.
17 maintains the hydraulic circuit of the steering wheel 211O in an open circuit, while the hydraulic circuit on the side of the steering wheel 1 is maintained in a closed circuit. The pressurized oil supplied from the oil tank 6 by the hydraulic pump 4 is sent to the orbit roll 3'.

Pipes A and B are connected to the orbit roll 3', and are connected to the front chamber 5' and rear chamber 5 of the cylinder 5 via electromagnetic valves 17 and 16, respectively, thereby forming one hydraulic circuit.

Now, by steering the steering wheel 2 and operating the orbit roll 3', pressurized oil can be transferred to pipe A or pipe B.
Switch to the direction of flow.

For example, if you place it as shown, orbit '1 towards W A.
Pressure oil is supplied to the front chamber 5' side of the cylinder 5 by the switching operation of the 110-ru 3', and moves the piston forward to the left in the figure, thus retracting the piston rod 14. As a result, the pressure oil in the rear chamber 5 side passes through the solenoid valve 16, passes through the pipe B, passes through the orbit roll 3', returns to the oil tank 6, and then circulates back to the pipe A.

Also, when the steering wheel 2 is steered to switch the orbit roll 3', the (d) pressure oil is sent to the pipe B and is supplied to the rear chamber 5 of the cylinder 5, moving the piston to the right in the figure. Therefore, the piston rod 14 is moved in the direction of extension, whereby the pressure oil in the front chamber 5' is returned to the oil tank 6 through the pipe A and the orbit roll 3' (not shown). It circulates to pipe B again.

In this manner, the construction machine is steered by the steering wheel 2.

Next, when operating the construction machine using the steering wheel l,
When the operation switch 18 is turned on as shown in the third tooth, the solenoid valves 1,5,16,17 are switched and the hydraulic circuit on the side of the steering wheel 1 is held in an open circuit. Hydraulic circuit on the steering handle 2 side - 1
:1 is kept in a closed circuit. As a result, the construction machine is operated by climbing onto the steering wheel l, as in the case of FIG. 2 above.

Further, in the case of the embodiment shown in FIG. 4, the electromagnetic clutch 21 on the steering wheel 2 side is held in a closed circuit as shown in the figure;
The electromagnetic clutch 20 on the steering wheel l side is opened and the steering wheel ■ is locked. By steering the steering handle 2, the orbit roll 3 is operated via the chain 11, and the piston rod 14 is extended and contracted similarly to the embodiment shown in FIGS. 2 and 3, and the construction machine is operated while controlling the steering device. is steered.

By switching the operation switch 18, the steering wheel 2 is locked in the opposite direction, and the electromagnetic clutch 2 is held in a closed circuit.
Steering is possible in the same way using the steering wheel 1 on the 0 side.

According to the steering wheel/handle switching device of the present invention configured as detailed above, one of the left and right steering handles of a construction machine can be used to switch the operation of a steering device consisting of a solenoid valve or an electromagnetic clutch. A means is installed in the hydraulic circuit with an orbit roll or in the shaft of the steering wheel, and it is automatically locked by opening and closing the operation switch, so you can switch! '
ffi operation is easy, and even if you steer the left and right wheels at the same time, there will be no interference with each other, and there is no risk of danger due to incorrect operation by two operators, increasing safety. did it.

[Brief explanation of the drawing]

FIG. 1 is a structural system diagram showing a conventional steering handle device, FIGS. 2 and 3 show an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation when the operation switch is open, and FIG. The figure is an explanatory diagram of the operation when the operating switch is closed, and Figure 4 shows a W'tM system showing another embodiment, and is an explanatory diagram of one steering switch locked by opening and closing the operating switch. . ], 2... Steering handle 3.3'...
・Orbit roll 4...Hydraulic pump 5・
・・・・・・Cylinder 15.16.17・・・・・・
Solenoid valve ■8... Operation switch 20.21.
...Electromagnetic clutch patent applicant Kawasaki Heavy Industries, Ltd.

Claims (3)

[Claims] (1) Using the steering handles installed on both the left and right sides of the construction machine, the orbit roll installed in the hydraulic circuit that supplies pressure oil from the oil tank to the cylinder with a hydraulic pump is operated.
In a steering wheel device that operates the cylinder connected to a steering device that controls the direction of the wheels to perform steering, the hydraulic circuit is provided with a steering switching means that switches the operation of the steering device. A steering handle switching device for construction machinery, characterized in that one of the left and right steering handles is locked by opening and closing an operation switch. (2) The steering switching means is provided with electromagnetic valves in a hydraulic circuit from the hydraulic pump to the orbit roll, a hydraulic circuit from the orbit roll to the cylinder, and a hydraulic circuit from the cylinder to the orbit roll. A steering handle switching device for construction machinery according to claim 1. (3) The steering handle switching device for construction machinery according to claim 1, wherein the steering switching means includes electromagnetic clutches provided on the shafts of the left and right steering handles, respectively.