JPS6314932A - Operating equipment for hydraulic front loader - Google Patents

Abstract

PURPOSE:To prevent unexpected high-speed running of an hydraulic front loader with high operating efficiency by using a mechanism enabling speed-up operations by a switch to allow the speed-up operation of engine only during stoppage of traveling while operating the front loader. CONSTITUTION:A solenoid 26 is connected in series to a battery 31, the first switch 32, and the second switch 33. When both the switches 32 and 33 turn ON, the solenoid body 29 is electrically energized to pull an operating rod 27 to the direction of arrow A, and a lever 20 is moved to the speed-up direction in a rocking manner. When the switch 32 is in OFF state all the time, it turns ON when the operating lever 18 of a front loader F is concurrently operated, and engine is speeded up to increase the power of the loader F. The switch 33, although in OFF state usually, turns ON when a tractor is in no traveling state. The speed-up mechanism is operated only when the vehicle 1 is in traveling state, ensuring the safety of operations.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an operating device for a hydraulic front loader.

(Prior Art) There is a conventional front loader mounted on a vehicle that is operated by pressure oil discharged from a hydraulic pump driven by a vehicle running engine.

(Problem to be solved by the invention) When performing front loader work with a vehicle stopped near a cliff or ditch, the engine should be kept at a low speed to prevent the vehicle from running at high speed even if it starts moving unexpectedly. We are trying to ensure safety.

However, when the engine is in a low speed state, the power of the hydraulic pump is also reduced, so there is a problem that the working efficiency of the front loader is reduced.

The present invention aims to solve the above problems.

(Means for Solving the Problems) The technical means taken by the present invention to solve the problems of the prior art are characterized by the fact that the front loader F mounted on the vehicle l is The switch 32 that operates the speed increasing mechanism of the engine 10 is operated by the pressure oil discharged from the hydraulic pump 9 driven by the
The switch 32 is provided so as to be operable simultaneously with the operating lever 18 of the front loader F, and the switch 32 can operate the speed increasing mechanism only when the vehicle 1 is stopped.

(Function) By operating the switch 32, the engine 1 in a low speed state is
0 can be increased, the power of the hydraulic pump 9 can be increased, and the work efficiency of the front loader F can be increased. Then, if the vehicle 1 accidentally enters the running state, the switch 3
2 cannot increase the speed of the engine 10 and is in a low speed state, and does not run at high speed.

Further, the switch 32 and the operating lever 18 can be operated simultaneously, and therefore have good operability.

(Example) Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows a bucket 7) type front loader F mounted on a tractor vehicle, where 1 is a vehicle (a tractor as an example), 2 is a mounting frame, and 3 is a pair of left and right booms, which are pivoted to the mounting frame 2 so that they can be raised and lowered. It can be raised and lowered by a pair of left and right boom cylinders 4. 5 is the bucket, boom 3
It is pivotably supported at the tip of the cylinder and can be rotated by a pair of left and right packet cylinders 6. 7 is a three-point link mechanism, and 8 is a hydraulic device for raising and lowering the working machine attached via the three-point link mechanism 7. Further, 18 is an operating lever of the front loader F.

FIG. 2 shows a hydraulic circuit, where 9 is a hydraulic pump, which is driven by an engine 10. 11 is a solenoid valve for controlling the boom cylinder 4, and 12 is a solenoid valve for controlling the packet cylinder 6. These are connected in series with the solenoid valve 11 at the front stage and the solenoid valve 12 at the rear stage. The solenoid valve 11 has an ascending solenoid 13 and a descending solenoid 14.
has a dump solenoid 15 and a rollback solenoid 16. 17 is a relief valve.

FIG. 3 shows the operating mechanism of the operating lever 20 of the injection N adjustment device 19 of the fuel injection pump (not shown) which is the speed increasing mechanism of the engine 10. The engine rotation speed is increased by swinging in the direction of the arrow. This lever 20 is provided with a long hole 22,
A connecting shaft 24 provided at one end of an accelerator rod 23 is loosely inserted into and pivotally supported in this elongated hole 22 . accelerator rod 23
is interlocked with a hand accelerator lever (not shown) and a foot accelerator pedal (not shown), and is pulled to the left in the figure by the operation thereof, thereby swinging the lever 20 in the speed increasing direction.

Further, the lever 20 is provided with a round hole 25.
5, a connecting shaft 28 provided at one end of an operating rod 27 of a solenoid device 26 is loosely inserted and pivotally supported. The solenoid device 26 energizes the solenoid body 29 to pull the actuating rod 27 in the direction of the arrow, thereby swinging the lever 20 in the speed increasing direction. Here, when the lever 20 swings by the solenoid device 26, the connecting pin 24 at one end of the accelerator rod 23 moves relatively within the elongated hole 22, so the swing is not restricted. Further, when the solenoid main body 29 is not excited, the actuating rod 27 is freely movable in the pushing and pulling directions, and the swinging of the lever 20 by the accelerator rod 23 is not restricted. A return spring 30 urges the lever 20 to swing in the deceleration direction, and causes the lever 20 to swing in the deceleration direction when the acceleration rod 23 or the operating rod 27 is released from swinging in the speed increase direction. .

The solenoid device 26 is connected in series with the battery 31, the first switch 32, and the second switch 33,
When both switches 32 and 33 are turned on, they are energized and excited. The first switch 32 is normally OFF, but is provided above the upper grip portion of the operating lever 18 of the front loader F, and can be turned ON by operating the operating lever 18 at the same time. The second switch 33 is normally OFF, and is turned off when the tractor is not running, for example, when the brake (not shown) is activated, the running power transmission clutch (not shown) is disconnected, or the gear transmission is turned off. (not shown) is set to be in the neutral state.

As a result, when the tractor is stopped and work is performed using the front loader F, the front loader power can be increased by increasing the speed of the engine 10 by turning on the first switch 32. It has good workability because it can be operated simultaneously. Also,
When the tractor unexpectedly enters the running state, the second switch 33 is turned OFF, the engine 10 is not accelerated, the tractor does not run at high speed, and safety is excellent.

This becomes clear when compared with the case where the second switch 33 is not provided as shown in the fourth figure.

Note that activating the speed increasing mechanism only when the first switch 32 is in a stopped state is not limited to the electrical method described above, but may also be performed mechanically, and engine speed increasing can also be performed by injection. The method is not limited to one that operates the lever 20 of the amount adjusting device 19.

(Effects of the Invention) According to the present invention, by increasing the engine speed while operating the front loader, the front loader power can be increased and the operating efficiency can be improved. Engine speed is not increased, and safety can be ensured by preventing the vehicle from running at high speed.

[Brief explanation of the drawing]

Fig. 1 is a side view of a tractor equipped with a front loader according to an embodiment of the present invention, Fig. 2 is a hydraulic circuit diagram for operating the front loader, Fig. 3 is an explanatory diagram of the operation of the engine speed increasing mechanism, FIG. 4 is an explanatory diagram of the operation of the engine speed increasing mechanism according to the comparative example. DESCRIPTION OF SYMBOLS 1...Tractor, 9...Hydraulic pump, 10...Engine, 18...Operation lever, 32...Switch.

Claims (1)

[Claims] (1) When the front loader F mounted on the vehicle 1 is operated by pressure oil discharged from the hydraulic pump 9 driven by the vehicle running engine 10, the switch 32 operates the speed increasing mechanism of the engine 10. but,
The hydraulic type is provided so as to be operable simultaneously with the operating lever 18 of the front loader F, and the switch 32 is capable of operating the speed increasing mechanism only when the vehicle 1 is stopped. Front loader operating device.