JPS62288227A - Indicator for operation of front loader - Google Patents

Abstract

PURPOSE:To safely and efficiently perform operations by providing a multitude of displayers to show the operating directions of an operating lever. CONSTITUTION:A rising detecting switch 34, a lowering detecting switch 35, a scooping detecting switch 36, and a dumping detecting switch 37 are provided. The first drive circuit to operate corresponding displayers 40, 41, 42, and 43 for operating directions of an operating lever by the switches 34-37 is made up of NOT circuit 54, AND circuits 55, 56, 57, and 58, and light emitting diodes 46, 47, 48, and 49. Also, the second drive circuit to be driven by discriminating from the displayers 40-43 driven at the time of detection of pressure switches provided for the hydraulic circuits of the boom cylinder and bucket cylinder is made up of NOT circuit 54, AND circuits 59, 60, 61, and 62, and light emitting diodes 50, 51, 52, and 53.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to a front panel that raises and lowers a boom according to the operating direction of an operating lever, and that scoops and dumps packets. The present invention relates to a loader operation instruction device.

(Prior art) A front loader has a control lever that controls the valves of a boom cylinder and the valves of a bucket cylinder according to the operating direction of a swingably supported control lever to raise and lower the boom as well as scoop and dump packets. However, in the past, no special display means was provided to display how the valves of the boom cylinder and bucket cylinder are operating when the operating lever is operated.

(Problem to be solved by the invention) Therefore, in the conventional case, it was not possible to confirm the operation of the operating lever, and when the operating lever was operated, it was not possible to check the current state of the film cylinder and the bucket cylinder's hull reflex. It was difficult to know what was happening, making it impossible to work safely and efficiently. Further, even if the hydraulic pressure of the boom cylinder or bucket cylinder reaches the relief pressure by operating the operating lever, there are many cases where the operator does not notice this, resulting in a problem that the efficiency of work becomes extremely poor.

The present invention addresses the above-mentioned problems and enables safe and efficient work by making it possible to confirm the operation of the control lever.

(Means for Solving the Problem) The technical means of the present invention for solving this technical problem is to raise and lower the boom IO and scoop and dump the packet 13 according to the operating direction of the operating lever 26. In a float loader configured to control the valve 16 of the boom cylinder 11 and the valve 17 of the bucket cylinder 14 as shown in FIG. A plurality of detection switches 34, 35, 36, 37 are provided corresponding to the operating direction to detect that the operation of the cylinder 11.14 has reached the valve operating position, and to detect that the oil pressure of the cylinder 11. A pressure switch 45 for detection is provided, and a first drive circuit is provided for driving the display portions 40.41, 42.43 corresponding to the operating direction of the operating lever 26 by detection of the detection switches 34, 35, 36.37, The display section 40 is activated when the pressure switch 45 is detected.
．． 41, 42, and 43 in such a manner that they can be distinguished from the aforementioned drive circuit.

(Function) When the operating lever 26 is operated in the forward direction, the valve 16 is activated and the boom 10 is lowered, the lowering detection switch 35 is turned on, and the lowering indicator 41 is lit in yellow by the operation of the light emitting diode 47. . At this time cylinder 11.1
4 approaches the relief pressure, the pressure switch 45 is turned on, the light emitting diode 51 is activated in place of the light emitting diode 56, and the lowering display section 41 lights up in red. Also, when the operating lever 26 is operated in the left front direction, the valve 16
．． 17 is activated and the boom 10 is lowered, the packet 13 is scooped, and at the same time, the lowering detection switch 3 is activated.
5 and the scoop detection switch 36 are turned on, and the display section 41.42 lights up in yellow due to the operation of the light emitting diode 47.48. At this time, when the oil pressure of the cylinder 11.14 approaches the relief pressure, the pressure switch 45 is turned on, the light emitting diode 51.52 is activated instead of the light emitting diode 47.48, and the display section 41.42 lights up in red. . Hereinafter, the same applies to the case where the operation lever 26 is operated to the left, right, or diagonally.
The operation of the operating lever 26 can be confirmed by.

In the case of the embodiment shown in FIG. 9, when the pressure switch 45 is turned on, the display sections 40, 41, 42, and 43 change from lighting to blinking.

(Example) Hereinafter, the present invention will be explained according to the illustrated example.
In the figure, l is the tractor body, 2 is the front wheel, 3 is the rear wheel,
4 is the rear wheel fender, and 5 is the driver's seat. Reference numeral 6 designates a front loader, which includes a mast 8 that is detachably installed on both sides of the tractor body 1 via a mounting base 7, and a boom 10 that is pivoted to the upper end of the mast 8 via a pivot shaft 9 so as to be movable up and down. A boom cylinder 11 for raising and lowering the boom 10, a packet (working tool) 13 rotatably supported on the tip of the boom 1 by a pivot 12, and a bucket cylinder 14 for rotating the bucket eye 3. Consists of.

The boom cylinder 11 is a proportional solenoid valve 1 for boom control.
6. The bucket cylinder 14 can be controlled by a proportional electromagnetic valve 17 for packet control.

These electromagnetic valves 16, 17 are connected in series as shown in FIG. The boom control solenoid valve 16 has a raising solenoid 18 and a lowering solenoid 19, and can be operated to any position from a neutral position to a raised position and a lowered position by energizing these solenoids 18 and 19. The electromagnetic valve 17 for bucket control has a scooping solenoid 20 and a dumping solenoid 21, and can be operated to any position from a neutral position to a scooping position and a dumping position by energizing these solenoids 20 and 21. In addition, in FIG. 4, 22 is a pump, and 23 is a relief valve.

Reference numeral 24 denotes an operating device, as shown in FIGS. 2 and 5 to 7, which is operated by a case 25 mounted on the rear wheel fender 4 on one side of the driver's seat 5 in the front/rear, left/right, and diagonal directions. A freely movable operating lever 26, first and second potentiometers 27, 28, etc. that are interlocked with this operating lever 26 are incorporated. That is, the operating lever 26 is pivotally supported by the movable frame 29 via the horizontal shaft 30, and the movable frame 29 is supported on the case 25 side via the front-rear shaft 31. Therefore, the operating lever 26
As shown in FIG. 7, it can be operated in any direction using two wheels, ie, a horizontal axis 30 and a front-rear axis 31, which are perpendicular to each other, as fulcrums. Note that the operating lever 26 is elastically held at a neutral position by a spring (not shown).

The first potentiometer 27 constitutes a raising/lowering command means for commanding the raising and lowering of the boom 10, and is linked to the back and forth movement of the operating lever 26 via the horizontal shaft 30, and is responsive to the amount of operation of the operating lever 26. Outputs a command signal of 1 voltage.

The second potentiometer 28 constitutes a rotation command means for commanding the rotation of the packet 13, and is
, outputs a voltage command signal to the solenoids 18, 19, 20, 21 in conjunction with the left and right movement of the operating lever 26 via the movable frame 29 and corresponding to the operating amount of the operating lever 26, and controls the operating direction of the operating lever 26. Accordingly, the packet 16 of the boom cylinder 11 and the valve 17 of the bucket cylinder 14 are controlled so that the boom 10 is raised and lowered and the packet 13 is scooped and dumped. As shown in FIG. 8, when the operating lever 26 is swung forward, right-front, or left-front from the neutral position (N) facing vertically, an excitation current flows through the lowering solenoid 19, and the boom 10 is lowered at a speed proportional to the amount of operation of the operating lever 26 toward the front side. When the operating lever 26 is rocked rearward, right rearward, or leftward rearward, an excitation current flows through the raising solenoid 18, and the boom 10 moves the operating lever 2.
It rises at a speed proportional to the amount of operation to the rear of 6. When the operating lever 26 is rocked to the left, front left, or rear left, an excitation current flows through the scooping solenoid 20, and the packet 13 is scooped at a speed proportional to the amount of leftward operation of the operating lever 26. Also, when the operating lever 26 is rocked to the right, front right, or rear right, an excitation current flows through the dumping solenoid 21, and the packet 13 moves to the operating lever 2.
Dump operation is performed at a speed proportional to the amount of operation to the right of 6.

A hemispherical actuating part 33 is provided at the lower end of the operating lever 26, and a rise detection switch 34, a fall detection switch 35, and a scoop detection switch are provided on the bottom side of the case 25 in the front, back, left, and right directions around the actuation part 33. 36, a dump detection switch 37 is provided.

These detection switches 34, 35, 36.37 are the valve 1
When the operating lever 26 is operated until the levers 6 and 17 become actuable, they are pressed by the actuating portion 33 and turned on. 38 is a flexible cover.

In FIG. 2, 40 is a rising display section, 41 is a descending display section, 42 is a scooping display section, and 43 is a dump display section. It is provided on the rear upper surface of the case 25.

FIG. 1 shows a control circuit for driving the display section 40, 41, 42, 43, and in the same figure, 45 is a pressure switch, which is provided in the hydraulic circuit of the cylinder 11, 14 as shown in FIG. It is configured to turn on when it detects that the pressure in the hydraulic circuit has reached the vicinity of the relief pressure (becomes a predetermined pressure or higher).

46, 47, 48, 49 are yellow light emitting diodes, which are provided inside the display sections 40, 41, 42. 43, respectively, and when the light emitting diodes 46, 47, 48, 49 are activated, the corresponding display section 40.41 and 42.43 are lit yellow respectively. 50.51.52.
53 is a red light emitting diode, and display portions 40 and 41, respectively.
, 42, 43, and when the light emitting diodes 50, 51, 52, 53 are activated, the corresponding display parts 40, 41, 42, 43 light up in red, respectively.

54 is N07 circuit, 55, 56.57, 58, 59.6
0,61.62 is an AND circuit.

Note that in the embodiment, the detection switches 34 and 35.

The first drive circuit that drives the display sections 40.41, 42.43 corresponding to the operation direction of the operation lever 26 by the detection of 36.37 is connected to the NOT circuit 54 and the AND circuits 55, 56, 5.
7.58, light emitting diodes 46.47, 48.49, etc. Further, a second drive circuit that drives the display sections 40, 41, 42, 43 driven when the pressure switch 45 is detected so as to be distinguishable from the drive is a NOT circuit 54, an AND circuit 59, 60, 61, 62, and a light emitting circuit. It is composed of diodes 50, 51, 52, 53, etc.

FIG. 9 shows another embodiment, in which 64 is a multi-by-break composed of two NAND circuits 65, 66, and when the pressure switch 45 is off, the AND circuits 55, 56, 5
7. While outputting high voltage to 58, pressure switch 45
When the pressure switch 45 is on, the light emitting diode 50, 51, 52 of the above embodiment is configured to output an oscillating pulse of high voltage and low voltage.
．． Light emitting diode 46, 47, 48 in place of operation of 53
．． 49 on/off to display the corresponding display parts 40, 4.
1, 42, and 43 are made to blink.

In addition, in the embodiment described above, the operating lever 26 is operated by swinging in the front, back, right, left, and diagonal directions, but instead of this,
The operating lever 26 may be configured so that it can be operated only in the front, rear, left, and right directions, or only in the diagonal direction.In short, the operating lever 26 can be operated in a plurality of operating directions.
Any device that can control the lifting and lowering of the packet 13 and the scooping and dumping operations of the packet 13 may be used.

(Effects of the Invention) According to the present invention, it is possible to confirm whether or not the operation of the operation lever 26 is transmitted to the valve 16.17 by the operation of the display units 40, 41, 42.
6 can be prevented and work can be done safely and efficiently.

Further, when the hydraulic pressure of the cylinder 11.14 reaches a predetermined pressure or more, this can be displayed on the display section 40, 41, 42, 43, and from this point as well, the operating lever 2
6, it is possible to perform efficient and effortless operations, prevent dangerous work, and further improve work efficiency.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line X-X of Fig. 6, Fig. 3 is a side view of the tractor, and Fig. 4 is a hydraulic circuit diagram of the same. , FIG. 5 is a rear view of the same operating device, FIG. 6 is a back sectional view of the same operating device, FIG. 7 is a sectional view taken along the Y-Y line of FIG. 6, and FIG. 8 is an explanatory diagram of the same control device. It is. FIG. 9 is an electric circuit diagram showing another embodiment. 1... Tractor body, 10... Boom, 11...
Boom cylinder, 13...Packet, 14...Bucket cylinder, 16...Solenoid valve for boom control,
17... Electromagnetic valve for packet control, 34... Rising detection switch, 35... Falling detection switch, 36...
... scoop detection switch, 37... dump switch,
40... Ascending display section, 41... Descending display section, 42.
...Scoop display section, 43...Dump display section, 45...
・Pressure switch, 45...N07 circuit, 46-43・
...Light emitting diode, 55-62...AND circuit, 6
4...Multi-bye break.

Claims (1)

[Claims] (1) Depending on the operating direction of the operating lever 26, the boom 10
In the float loader, the valve 16 of the boom cylinder 11 and the valve 17 of the bucket cylinder 14 are controlled so as to raise and lower the packet 13 and scoop and dump the packet 13. 40, 41, 42, 43 are provided, and a plurality of detection switches 34, 35, 36, 37 are provided corresponding to the operating direction to detect that the operation of the operating lever 26 has reached the valve operating position, and the cylinder 11 , 14 is provided with a pressure switch 45 for detecting that the oil pressure of the hydraulic pressure of the pressure sensor 34, 35, 36, 37 is higher than a predetermined pressure.
A first drive circuit is provided to drive the display sections 40, 41, 42, 43 corresponding to the operating direction of the operating lever 26 upon detection of the pressure switch 45. 1. An operation instruction device for a front loader, characterized in that a second drive circuit is provided for driving the drive circuit in such a manner that the drive circuit can be distinguished from the drive circuit described above.