JPH04237726A - Bucket operating device of back-hoe - Google Patents

Abstract

PURPOSE:To facilitate shakeoff operation and prevent soil and sand from falling off from a bucket at time of revolving by furnishing a driving means to change over driving of a control valve of a bucket cylinder into the condition in which the bucket is continuously swung at a certain amplitude to the scratch-in side and the soil discharge side alternately, and providing a maneuvering tool for it. CONSTITUTION:A driving means B is furnished capable of changing over a control valve 6 of a bucket cylinder 5 into the condition in which a bucket 2 is continuously swung at a certain amplitude to the scratch-in side and soil discharge side alternately. When an automatic soil shakeoff switch 9 is pushed, a pulse generator 11 gives intermittent signals to a controller 8. Then solenoids 12, 13 to slide the spool of the bucket control valve 6 are fed with current alternately, and the control valve 6 is continuously changed over at small intervals, and thus the bucket 2 is vibrated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket operating device for a backhoe that allows a bucket scooped with earth and sand to be vibrated little by little in the direction of its swinging operation.

0002

[Prior Art] In excavation work using a backhoe, when the bucket turns to load the soil and mud into the loading platform of a truck, the top of the piled-up soil inside the bucket may collapse or the outside surface of the bucket may collapse. The soil and sand that has adhered to the surface often falls, which not only makes the work area dirty, but also makes it unsatisfactory from a safety standpoint. To prevent this, in the past, the bucket operation lever was continuously operated back and forth alternately between the raking side and the earth discharging side when the boom was raised after scooping the earth and sand, that is, when it started turning. The bucket was vibrated to shake off dirt that would easily fall off, and then the bucket was rotated.

0003

[Problems to be Solved by the Invention] However, it is troublesome and labor-intensive to manually manually move the control lever each time to perform the frequently necessary sieving operation, and it is difficult to use an effective vibration-driven bucket. It was difficult to maintain the condition, and there was still room for improvement. SUMMARY OF THE INVENTION An object of the present invention is to make it possible to perform a bucket sifting operation simply and easily.

0004

[Means for Solving the Problems] To achieve the above object, the present invention provides a bucket operating device for a backhoe in which the bucket is continuously oscillated alternately between the raking side and the soil discharging side with a predetermined amplitude. The present invention is characterized in that it is provided with a drive means that can switch the drive of the control valve of the bucket cylinder, and is equipped with an operating tool that can freely operate and stop the drive means.

[0005]

[Operation] According to the above structure, the bucket sifting operation can be automatically realized simply by manually operating the operating tool of the drive means, and the sifting operation can be stopped simply by manually operating the operating tool. be able to. In other words, since the driving means for continuing the sieving operation is provided, it is no longer necessary to continuously manually operate the operating lever to continue the sieving operation as in the conventional method.

[0006]

[Effects of the Invention] Therefore, since the operation required to make the bucket swing back and forth in small steps can be omitted, the labor required for the sieving operation, which is required relatively frequently, can be reduced. It has been possible to provide a useful bucket operating device for a backhoe that is simple and easy to operate and can prevent earth and sand from falling from the bucket when turning.

[0007]

Embodiments Below, embodiments of the present invention will be explained based on the drawings. FIG. 3 shows the working state of the backhoe excavation work device A, and FIG. 1 shows the operating system of the boom 1 and the bucket 2. The solenoid control valve 4 of the boom cylinder 3 and the solenoid control valve 6 of the bucket cylinder 5 are controlled by a cross-type operation lever 7.
The control lever 7
and each control valve 4, 6 are connected via a controller 8. Thereby, the boom 1 can be raised and lowered by swinging the single operating lever 7 back and forth, and the bucket 2 can be rocked by swinging the single operating lever 7 from side to side.

[0008] In this backhoe, the drive means is capable of driving and switching the control valve 6 of the bucket cylinder 5 so that the bucket 2 is continuously oscillated alternately between the raking side and the soil discharging side with a predetermined amplitude. B is provided, and an automatic soil-dropping switch (corresponding to an operating tool) 9 that can freely turn on and off the drive means B is provided. In other words, switch 9
is connected to the controller 8 and configured as a normally open type push switch that enters the ON state in which conduction occurs when the knob 10 is pushed in, and automatically returns to the OFF state in which conduction is interrupted when the push operation is released. Along with this switch 9
A pulse generator 11 that operates when the switch is turned on and stops when the switch is turned off is also connected to the controller 8, and the controller 8 and the pulse generator 11 constitute a driving means B.

That is, when the switch 9 is pressed and operated, the pulse generator 11 outputs the intermittent signal shown in FIG. The control valve 6 is continuously switched in small increments, so that the bucket 2
The operator can shake off soil from the bucket 2 by simply pressing the switch 9. It would be convenient if the energization interval of the solenoids 12 and 13 could be variably adjusted (for example, by a volume type) so as to match the differences in excavation work conditions such as the type of earth and sand and the degree of wetness.

[Another Embodiment] ■ When the switch 9 is pressed once, the driving means B is configured to operate for a preset certain period of time (for example, 5 seconds) and then automatically stop, thereby making the operation easier. A bucket operating device may also be used. ■ As shown in Figure 3, a sensor is provided to detect the position of the bucket 2 when it is fully swung toward the raking side and is suitable for turning movement, and when this sensor is activated, the driving means B is automatically activated for a certain period of time. It is also possible to use an end detection means configured to operate and then stop, thereby eliminating the need for an operator to perform a screening operation. ■ If you install a device that can change and adjust the swing amplitude of bucket 2,
It's even more practical. (2) In a hydraulic pilot operated type, the present invention may be applied to a circuit in which a driving means B for continuously switching the control valve of the bucket 2 is configured and the control valve is operated by hydraulic pressure. (2) The driving means B may include a mechanically operated control valve, in which the spool of the control valve is continuously reciprocated by a motor.

[0011] Note that although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure of the accompanying drawings by such entry.

[Brief explanation of the drawing]

[Figure 1] System diagram showing the operation structure of the bucket cylinder

[Figure 2] Graph showing the state of the pulse generation signal

[Figure 3] Side view of the backhoe showing the screening operation status

[Explanation of symbols]

2 Bucket 5 Bucket cylinder 6 Control valve 9. Operating tools B Driving means

Claims (1)

[Claims] Claim 1: The control valve (6) of the bucket cylinder (5) is operated to switch the drive so that the bucket (2) is continuously oscillated alternately between the raking side and the soil discharging side with a predetermined amplitude. A bucket operation device for a backhoe, which is provided with a drive means (B) capable of driving the drive means (B) and is equipped with an operation tool (9) that can freely operate and stop the drive means (B).