JPS61221424A - Horizontal controller for working tool of front loader - Google Patents

Abstract

PURPOSE:To obtain a horizontal attitude for a bucket without the needs for visually judging the horizontal attitude of the bucket by giving a command to a solenoid valve in such a way as to make a working tool nearly horizontal by the signals from a detector to detect inclination around horizontal shaft of the working tool. CONSTITUTION:To lower a boom by making the bottom face of a bucket horizontal state, the push button-type switch 28 for automatic command of the grip 27 of an operating lever 19 is turned ON. When the bottom face of the bucket 5 is inclined to the front side, a ball 16 is rolled forwards, a switch 17 is turned ON, and a solenoid 33 for roll back is excited. A solenoid valve 30 is operated, and the ball 16 is rolled back until the bottom of the bucket becomes horizontal by contraction of the bucket cylinder. The horizontal degree of the bucket can thus be easily secured, and advantages of enhancement of operating efficiency and also of prevention of maloperations can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a work implement horizontal control device for a front loader.

(Prior Art) In a front loader that is attached to a tractor or the like, a working tool, such as a packet, is pivoted to the tip of a boom that is pivotably supported to be able to move up and down, and to be able to move up and down about a horizontal axis. This is rotated using a hydraulic cylinder.

When using this type of front loader to excavate the ground horizontally and load the soil into a transport vehicle, it is better to lower the packet with the bottom side in a horizontal position and move forward immediately after touching the ground to dig. It is convenient because it can be done.

Therefore, there is a system in which a special mechanism is incorporated into the hydraulic control valve that controls the boom or the packet, and horizontal control is performed in the hydraulic circuit.

(Problems to be Solved by the Invention) However, in this case, the mechanism of the control valve becomes extremely complicated, and there are problems in terms of reliability, durability, etc. Therefore, this is not actually implemented, and the operator usually controls the packets by visually determining the horizontality of the packets. on the other hand,
In recent years, the use of cabins has progressed particularly in tractors, etc., and visual inspection is becoming difficult due to the limited visibility.

(Means for Solving the Problems) The present invention solves these conventional problems, and as a specific means for that purpose, the tip of the boom 3 is provided with vertical movement around the horizontal axis 6. It is equipped with a cylinder 7 for rotating the freely pivoted working tool 5, a solenoid valve 30 for controlling the cylinder 7, and a manual command switch 25, 26 for giving a vertical movement command to the solenoid valve 30. In the front loader, a detector 12 detects the inclination of the work tool 5 about the horizontal axis 6, and a signal from the detector 12 gives a command to the electromagnetic valve 30 to make the work tool 5 substantially horizontal. It is something.

(Function) When horizontal control is required, it is sufficient to switch to automatic control using the detector 12. That is, if the working tool 5 is tilted, the detector 12 is activated, and the cylinder 7 is operated via the electromagnetic valve 30, thereby automatically controlling the working tool 5 to be approximately horizontal.

(Example) Hereinafter, the present invention will be described in detail with reference to the illustrated example.
The figure shows a packet-type front loader for mounting on a tractor. 1 is a tractor, 2 is a mounting frame, and 3 is a pair of left and right booms. The mounting is pivoted to the frame 2 so that it can be raised and lowered, and is mounted by a pair of left and right boom cylinders 4. It can be raised and lowered freely. 5
is a packet, which is pivotally supported by a horizontal shaft 6 at the tip of the boom 3, and can be moved up and down by a pair of left and right packet cylinders 7. 8 is a three-point link mechanism, and 9 is a hydraulic device for raising and lowering the working machine attached via the three-point link mechanism 8. 10 is a driver's seat, and 11 is a cabin that covers the driver's seat 10, etc.

A detector 12 detects the inclination of the bottom surface of the packet 5, and is constructed as shown in FIG. That is, this detector 1
2 includes a receiver 14 having a spherical recess 13 on the upper surface and a cover 15 attached to the receiver 14, and a ball 16 such as a steel ball is placed in the recess 13 of the receiver 13 so as to be freely transferable. There is. On the other hand, on the receiver 14 side, proximity type switches 17 and 18 are provided at both front and rear ends, respectively, and the ball 16
The switch 17 or 18 closes when the object approaches.

Reference numeral 19 denotes an operating lever for manual operation, which is supported by the control box 20 via a support portion 21, as shown in FIG. 4, so as to be freely operable in the front, rear, left and right directions. As shown in FIG. 5, inside the control box 20, a floating switch 22, a rise switch 23, a fall switch 24, a dump switch 25, and a rollback switch 26 are incorporated to be operated by the front and back and left and right movements of the control lever 19. ing. Operation lever 1
A push button type automatic command switch 28 is provided at the upper end of the graph portion 27 at 9.

FIG. 6 shows a hydraulic circuit, where 29 is a solenoid valve for controlling the boom cylinder 4, 30 is a solenoid valve for controlling the packet cylinder 7, and these solenoid valves 29 and 30 are control valves for the hydraulic pump and the hydraulic device 9. It is incorporated between 31 and 31. Solenoid valve 3
0 has a dump solenoid 32 and a rollback solenoid 33. The solenoid valve 30 has a rising solenoid 34 and a descending solenoid 35.

The control circuit for the solenoid valve 30 is constructed as shown in FIG. That is, the dump solenoid 32 is connected to the switch 18.
25, the rollback solenoid 33 has switch 1.
7.26 are connected respectively. Also switch 17.1
8 is connected to an automatic command switch 28. 36 is a power source. In addition, the solenoid 34 and 35 of the solenoid valve 29
are connected to switches 23 and 24.

In the above configuration, when operating the front loader,
All you have to do is operate the operating lever 19 inside the cabin 11 forward, backward, left and right. For example, if the operating lever 19 is operated to the left, the rollback switch 26 is turned on, the rollback solenoid 33 of the TM valve 30 is energized, and the solenoid valve 30 is switched. Therefore, pressure oil is sent to the packet cylinder 7 in the contraction direction via the solenoid valve 30, and the contraction operation of the packet cylinder 7 causes the packet 5 to roll around the horizontal axis 6, that is, rotate in the upward direction. Conversely, if the operating lever 19 is operated to the right, the packet cylinder 7 will extend and the packet 5 will be dumped.

Similarly, when the control lever 19 is operated backward, the boom cylinder 4 is extended and the boom 3 is raised, and when operated forward, the boom cylinder 4 is contracted and the boom 3 is lowered.

When lowering the boom 3 with the bottom surface of the packet 5 in a horizontal state, the push button type automatic command switch 28 of the grip portion 27 of the operating lever 19 is pressed and turned on. Of course,
The operating lever 19 can also be operated forward.

Then, since the automatic command switch 28 is turned on, the switches 17 and 18 of the detector 12 begin to function. If the bottom surface of the packet 5 is tilted forward, the ball 16 will roll forward, so the switch 17 will be turned on and the rollback solenoid 33 will be energized. Therefore, the solenoid valve 30 works,
The packet cylinder 7 is contracted and the packet 5 is rolled back until its bottom surface becomes horizontal.

That is, the correction operation is performed until the ball 16 is located at the center of the recess 13. Therefore, it is easy to ground the packet 5 horizontally during excavation, and ensure levelness when raising and lowering the packet 5, which has the advantage of improving work efficiency and preventing such manipulation, as well as eliminating the need for skill in the work. There are advantages. Especially when working with a tractor equipped with a cabin 11, poor visibility becomes less of a problem.

The same applies when the packet 5 is tilted backward.

The detector 12 may be a microsinch type, an optical detection type using bubbles, a potentiometer, or the like.

Further, the working tool is not limited to the packet 5, and a fork or the like may be used in the same manner.

(Effects of the Invention) According to the present invention, the inclination of the work implement is detected by a detector, and the solenoid valve is controlled by the signal to keep the work implement approximately horizontal, so the configuration of the control system is simple. Therefore, it is very effective for practical application.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an electric circuit diagram;
FIG. 2 is a side view, FIG. 3 is a sectional view of the detector, FIG. 4 is a side view of the lever, FIG. 5 is a switch arrangement, and FIG. 6 is a hydraulic circuit diagram. 3-boom, 5--packet, 7-packet cylinder, 12-detector, 17.18--switch, 1
9--operation lever, 29.30--electromagnetic valve, 28--automatic command switch.

Claims (1)

[Claims] 1. A cylinder 7 that rotates the work tool 5 which is pivoted to the tip of the boom 3 so as to be able to move up and down about a horizontal shaft 6, a solenoid valve 30 that controls this cylinder 7, and a solenoid valve 30 that controls the cylinder 7. In a front loader equipped with switches 25 and 26 for manual commands that give vertical movement commands, a detector 12 detects the inclination of the work tool 5 around the horizontal axis 6, and a signal from the detector 12 causes the work tool 5 to The solenoid valve 30 should be approximately horizontal.
A work implement horizontal control device for a front loader, characterized in that the device is configured to give commands to the front loader.