JP2000017694A - Automatic vibration device for articulated machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic vibration device for an articulated machine having simple constitution and capable of being easily realized by using a hydraulic pilot type operating means. SOLUTION: The automatic vibration device for the articulated machine has a frequency setter 10, a direction changeover valve 11 installed to pilot lines 8a, 8b and a control unit 12, to which the signal of set frequency (f) from the frequency setter 10 is input and from which an automatic vibration signal is output to an electromagnetic driving section 11a for the direction changeover valve 11, and the frequency setter 10 functions as a vibration selective means in combination. The direction changeover valve 11 is changed over in a vibratory manner between two places of A and B by the automatic vibration signal, and gives a second boom automatic vibrations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic vibration device for an articulated machine having an articulated front device constituted by a plurality of front members including a two-piece boom. The present invention relates to an automatic vibration device of a two-piece boom type hydraulic shovel including a front device constituted by a bucket.

[0002]

2. Description of the Related Art In a conventional hydraulic excavator, when excavating hard ground, or when compacting the ground after leveling, the operation lever is shaken to manually generate vibrations or separate rocks. The work was done using a machine and a vibrating roller. At this time, manually generating vibrations is tired and therefore cannot be performed for a long time. Bringing in a separate machine causes a reduction in work efficiency.

Therefore, an automatic vibration device for facilitating such work has been invented.
There is one proposed in Japanese Patent Publication No. 21529. In this proposal, for a hydraulic excavator having a front device consisting of a boom (mono boom), an arm, and a bucket, a work mode switch for selecting which of the boom, arm, and bucket to vibrate, and an amplitude and frequency of the vibration are set. By providing a vibration mode switch, and adding a vibration component to the operation signal from each operation means of the boom, arm, and bucket according to the signal from these switches, and giving vibration to any of the boom, arm, and bucket, Excavation of hard ground is facilitated.

[0004]

However, the above prior art has the following problems.

In the proposal described in Japanese Patent Application Laid-Open No. 2-221529, the hydraulic excavator is intended for a normal hydraulic excavator having a front device having a monoboom. In this ordinary hydraulic excavator, the front members of the boom, the arm, and the bucket are front members that are always used in ordinary work such as excavation. When vibration is applied to the front members of the boom, the arm, and the bucket, these front members are used. Must be able to be operated normally by the operation signals of the respective operation means. For this reason, JP-A-2-221529
In the publication, an automatic vibration is generated by adding a vibration component to operation signals of each operation means of a boom, an arm and a bucket, and an electric lever method is used as an operation means for processing such operation signals, and a valve is used. The driving method is an electric driving method, and operation signals are electrically processed. However, electrical processing of the operation signal requires a complicated processing circuit, and the configuration is complicated and expensive.

A conventional hydraulic excavator mainly uses a hydraulic pilot type operating means, and the invention disclosed in Japanese Patent Application Laid-Open No. 2-221529, which requires electrical processing of operation signals, is disclosed in There is a problem that realization is difficult with a normal hydraulic excavator using the operating means.

An object of the present invention is to provide an automatic vibration device for an articulated machine which has a simple structure and can be easily realized by using a hydraulic pilot type operation means.

[0008]

In order to achieve the above object, an automatic vibration device for an articulated machine according to the present invention employs the following configuration.

(1) A multi-joint type front device including a plurality of front members including a two-piece boom rotatably attached to an upper revolving unit, and a hydraulic pressure for driving a second boom of the two-piece boom An automatic vibration device for an articulated working machine, comprising: an actuator, a flow control valve that controls a flow rate of pressure oil supplied to the hydraulic actuator, and an operation unit that instructs an operation of the second boom.
(A) vibration selecting means for selecting whether or not to automatically vibrate the second boom of the two-piece boom; and (b) when the vibration selecting means has selected automatic vibration, the frequency is set based on a preset frequency. It is assumed that the second boom is provided with vibration generating means for generating vibration.

[0010] By providing the vibration generating means in this manner and applying vibration to the second boom of the two-piece boom, vibration is applied to the tip end side of the second boom of the front device. Here, the second boom is a front member that is used less frequently during work, and normal work is performed only by other front members such as the first boom and the arm. For this reason, the operation using the vibration of the front device can be performed by applying vibration to the second boom.

Further, it is not necessary to apply vibration while operating the second boom, and it is not necessary to operate other front members such as the first boom and the arm while applying vibration.
There is no need to perform complicated processing such as adding a vibration component to the operation signal of the front member, and the configuration of the automatic vibration device is simplified. Further, since it is not necessary to add a vibration component to the operation signal, a normal hydraulic excavator equipped with hydraulic pilot type operation means can be easily realized.

Further, when the automatic vibration is not selected by the vibration selecting means, the second boom can be operated by the operating means as usual.

(2) The automatic vibration device for an articulated machine according to the above (1), preferably further comprising (c) frequency setting means for setting a frequency of the automatic vibration, wherein the vibration generating means comprises the frequency setting means The second boom is caused to vibrate by using the frequency set by the above as the preset frequency.

Thus, the set frequency at the time of automatic vibration can be freely adjusted.

(3) In the above (2), preferably, the frequency setting means has a volume operation means for changing the set frequency from 0 to a maximum, and the set frequency is set to 0 by the volume operation means. When this is done, the output is turned off to double as the vibration selecting means.

This turns off the output of the frequency setting means.
Then, the automatic vibration is not selected, and the second boom can be operated by the operating means as usual as described in (1) above.

(4) In the above (1), preferably, the vibration generating means inputs an operation signal of the operation means of the second boom, and the amplitude of the automatic vibration is determined by the magnitude of the operation signal. decide.

Thus, the amplitude of the automatic vibration can be freely adjusted by changing the operation amount of the operating means of the second boom, and the automatic vibration having the optimum amplitude according to the working condition can be always obtained.

(5) Further, in the above (1), preferably, the operating means of the second boom generates a pilot pressure as an operation signal and transmits this pilot pressure to each flow control valve via a pilot line. A hydraulic pilot system, wherein the vibration generating means is provided on a signal line for generating an automatic vibration signal of the second boom based on the set frequency, and provided on a pilot line of the operating means of the second boom; An automatic vibration valve that operates in response to an automatic vibration signal generated by the means.

Thus, as described in the above (1), an automatic vibration device can be realized by a normal hydraulic excavator provided with a hydraulic pilot type operating means.

(6) In the above (5), preferably,
The operation means of the second boom has first and second two pressure reducing valves, and the flow control valve of the second boom is connected to the first and second two pressure reducing valves via respective pilot lines. The automatic vibration valve has a first pressure reducing valve connected to a first hydraulic driving portion, and a second pressure reducing valve connected to a second hydraulic pressure portion. A first position connected to the drive, a second position connecting the first pressure reducing valve to the second hydraulic drive, and a second position connecting the second pressure reducing valve to the first hydraulic drive;
This is a direction switching valve that can be switched between the positions.

By providing an automatic vibration signal to the automatic vibration valve configured as described above and vibrating between the first position and the second position, vibration is applied to the second boom.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing a hydraulic drive device for a second boom of a hydraulic shovel to which the present invention is applied, together with an automatic vibration device of the present invention. The hydraulic drive device for the second boom includes a hydraulic source 2 and a tank. 5, a second boom cylinder 3b driven by pressure oil from the hydraulic pressure source 2, a flow control valve 4 for controlling the flow rate of pressure oil supplied to the second boom cylinder 3b, and an operation signal to the flow control valve 4. And an operating device 6 for switching the flow rate control valve 4 by outputting the control signal.

The operating device 6 is of a hydraulic pilot type that outputs a pilot pressure as an operating signal.
And two pressure reducing valves 6b and 6c. Pressure reducing valve 6
b and 6c generate a pilot pressure corresponding to the operation amount of the pedal 6a using the pressure oil of the pilot hydraulic pressure source 7 as a source pressure. The output ports of the pressure reducing valves 6b and 6c are connected to the pilot lines 8a and 8
The pilot pressure generated at the pressure reducing valves 6b, 6c is connected to the hydraulic driving units 4a, 4b of the flow control valve 4 via the pilot lines 8a, 8b, and is transmitted to the hydraulic driving units 4a, 4b via the pilot lines 8a, 8b. The pressure control valve 4 is switched by pressure.

FIG. 2 shows the appearance of the excavator. The hydraulic excavator according to the present invention includes a two-piece boom of a first boom 1a and a second boom 1b that rotate in a vertical direction, respectively.
The arm 1c and the bucket 1 that respectively rotate in the vertical direction
This is a two-piece boom type hydraulic shovel composed of a multi-joint type front device 1A composed of a d. and a vehicle body 1B composed of an upper revolving structure 1e and a lower traveling structure 1f. The base end of the first boom 1a of the front device 1A is supported by the front part of the upper swing body 1e so as to be vertically rotatable. Also, a first boom 1a, a second boom 1b, an arm 1c, and a bucket 1d
Are the first boom cylinder 3a, the second boom cylinder 3b, the arm cylinder 3c, and the bucket cylinder 3d, respectively.
Driven by Although not shown, the first boom cylinder 3a, the arm cylinder 3c, and the bucket cylinder 3d are also provided with the same flow control valve and operating device as those of the second boom cylinder 3b shown in FIG. However, the operating device is operated by a lever.

The above-described hydraulic excavator is provided with the automatic vibration device of the present embodiment. This automatic vibration device
A frequency setting device 10 for setting the frequency f of the automatic vibration, a direction switching valve 11 as an automatic vibration valve provided on the pilot lines 8a and 8b, and a signal of the set frequency f from the frequency setting device 10 are inputted, and Vibration signal is supplied to the direction switching valve 11
And a control unit 12 for outputting to the electromagnetic drive unit 11a.

The frequency setting device 10 has a dial 10a as a volume operation means, and the set frequency f increases as the dial 10a is rotated to the right. At the OFF position where the dial 10a is turned to the far left, the set frequency f is 0, and the output of the frequency setting device 10 is OFF.

The directional control valve 11 is a two-position directional control valve having two positions A and B. When the directional control valve 11 is at the position A, the pressure reducing valve 6b of the operating device 6 is connected to the hydraulic drive unit 4a of the flow control valve. And the pressure reducing valve 6c is connected to the hydraulic driving unit 4b, and when the position is switched to the position B, the pressure reducing valve 6b is connected to the hydraulic driving unit 4b and the pressure reducing valve 6c is connected to the hydraulic driving unit 4a. The destination of the pilot pressure from the pressure reducing valve 6b or 6c is switched to the hydraulic drive 4a or 4b.

The control unit 12 has an oscillating section 12a and an amplifier section 12b. The oscillating section 12a receives a signal of a set frequency f from the frequency setting device 10, and outputs a pulse signal (time-series signal) based on the set frequency f. ) Y, and the amplifier section 12b amplifies the pulse signal y and outputs it to the electromagnetic drive section 11a of the direction switching valve 11 as an automatic vibration signal. When the level of the pulse signal y is 1, the direction switching valve 11 is switched to the position B, and when the level becomes 0, the direction switching valve 11 is returned to the position A. As a result, the direction switching valve 11 is switched to the position A at the set frequency f. The position B is alternately and vibrationally switched to the position B.

With the dial 10a of the frequency setting device 10 set to a desired position and the desired frequency f set, the operating pedal 6a of the operating device 6 is operated to operate, for example, the pressure reducing valve 6b.
Is operated, the pilot pressure generated by the pressure reducing valve 6b is changed to the hydraulic drive unit 4 of the flow control valve 4 via the direction switching valve 11 which is oscillated at the set frequency f as described above.
The flow control valve 4 is alternately provided at a set frequency f. As a result, the hydraulic power source 2 is set at the set frequency f on the bottom side and the rod side of the second boom cylinder 3b.
The second boom 1b automatically vibrates at the set frequency f.

At this time, when the operation amount of the operation pedal 6a of the operation device 6 is changed and the magnitude of the pilot pressure is changed, the amplitude of the vibration also changes. Thus, the amplitude of the vibration of the second boom 1b can be freely adjusted by changing the operation amount of the operation pedal 6a.

Further, the dial 10a of the frequency setting device 10
Is set to the OFF position, the output of the frequency setting device 10 is also O
The direction change valve 11 is held at the position A, so that the second boom 1b can be operated with the operation pedal 6a as usual. That is, the frequency setting device 10 also functions as a vibration selection unit that selects whether or not to automatically vibrate.

FIG. 3 shows a state of the hydraulic excavator in which the second boom 1b is vibrated. The second boom 1b of the two-piece boom
Is applied to the front end of the front device 1A from the second boom 1b. Here, in a two-piece boom type excavator, the second boom 1b is generally used to change the attitude of the front device 1A before work, and is a front member that is used less frequently during work. Normal operations such as excavation work and compaction are performed only by the other front members of the first boom 1a, the arm 1c, and the bucket 1d. Therefore, by applying vibration to the second boom 1b, operations such as compaction and excavation using the vibration of the front device 1A can be easily performed. Further, by changing the operation amount of the operation pedal 6a, the amplitude of the vibration at that time can be freely adjusted, and the work using the vibration with the optimum amplitude can be performed.

As described above, according to the present embodiment, the second boom 1 with a low use frequency of the two-piece boom type excavator is used.
By applying vibration to b, the other front members of the first boom 1a, the arm 1c, and the bucket 1d are operated, and operations such as compaction and excavation using the vibration of the front device 1A can be easily performed.

The second boom 1b, which is used less frequently, does not need to be vibrated while operating.
Since the other front members a, arm 1c, and bucket 1d do not need to be operated while applying vibration, there is no need to perform complicated processing such as adding a vibration component to the operation signals of the front members 1a to 1d. The structure of the vibration device is simple and inexpensive. Further, since it is not necessary to add a vibration component to the operation signal, a normal hydraulic excavator including the hydraulic pilot type operation device 6 as in the present embodiment can be easily realized.

The dial 10a of the frequency setting device 10
Is turned to the OFF position and the output is turned off, the operation device 6 can operate the second boom 1b as usual.

Further, by changing the operation amount of the pedal 6a of the operating device 6 and changing the pilot pressure, the amplitude of the automatic vibration can be freely adjusted, and the automatic vibration having the optimum amplitude according to the working condition can always be obtained.

In the above embodiment, the present invention is applied to a hydraulic shovel having a hydraulic pilot type operating means. However, it is needless to say that the present invention may be applied to a hydraulic shovel having an electric lever type operating means. It is.

[0040]

According to the present invention, the operation using the vibration of the front device can be performed by applying vibration to the second boom, and the structure of the automatic vibration device can be simplified, and the automatic vibration device can be manufactured at low cost. In addition, an automatic vibration device can be easily realized even with a normal hydraulic excavator using a hydraulic pilot type operation means. Further, when the automatic vibration is not selected, the second boom can be operated by the operation means as usual.

Further, according to the present invention, the set frequency at the time of automatic vibration can be freely adjusted.

Further, according to the present invention, the amplitude of the automatic vibration can be freely adjusted by changing the operation amount of the operation means of the second boom, and the automatic vibration having the optimum amplitude according to the work situation can always be obtained. .

[Brief description of the drawings]

FIG. 1 is a diagram showing an automatic vibration device of a two-piece boom type excavator according to an embodiment of the present invention, together with a hydraulic circuit thereof.

FIG. 2 is a diagram showing the appearance of a two-piece boom type excavator.

FIG. 3 is a diagram showing a state in which a second boom of a two-piece boom type excavator is vibrating to perform an operation.

[Explanation of symbols]

 Reference Signs List 1A Front device 1B Body 1a First boom 1b Second boom 1c Arm 1d Bucket 1e Upper revolving unit 1f Lower traveling unit 2 Hydraulic power source 3b Second boom cylinder 4 Flow control valve 4a, 4b Hydraulic drive unit 5 Tank 6 Operating device 6a Operation Pedal 6b, 6c Pressure reducing valve 7 Pilot hydraulic pressure source 8a, 8b Pilot line 10 Frequency setting device 10a Volume 11 Direction switching valve 11a Electromagnetic driver 12 Control unit 12a Oscillator 12b Amplifier

Claims (6)

[Claims] 1. An upper revolving unit which is rotatably mounted on a revolving superstructure.
An articulated front device constituted by a plurality of front members including a piece boom, a hydraulic actuator for driving a second boom of the two-piece boom, and a flow rate for controlling a flow rate of pressure oil supplied to the hydraulic actuator An automatic vibration device for a multi-joint working machine comprising a control valve and an operation means for instructing the operation of the second boom, (a) selecting whether to automatically vibrate the second boom of the two-piece boom. A multi-joint comprising: vibration selection means; and (b) vibration generation means for generating vibration in the second boom based on a preset frequency when the vibration selection means selects automatic vibration. Automatic vibration equipment for work machines. 2. The automatic vibration device for an articulated machine according to claim 1, further comprising: (c) frequency setting means for setting a frequency of the automatic vibration, wherein said vibration generating means has a frequency set by said frequency setting means. And generating vibration in the second boom as the preset frequency. 3. The automatic vibration device for an articulated machine according to claim 2, wherein said frequency setting means has a volume operation means for changing the set frequency from 0 to a maximum, and sets said frequency by said volume operation means. An automatic vibration device for a multi-joint working machine, characterized in that the output is turned off when the value is set to 0 and the vibration selection means is also used. 4. The automatic vibration device for an articulated machine according to claim 1, wherein said vibration generating means receives an operation signal of said second boom operating means, and outputs the automatic vibration based on the magnitude of said operation signal. An automatic vibration device for an articulated working machine, characterized in that the amplitude is determined. 5. An automatic vibration device for an articulated machine according to claim 1, wherein said operating means of said second boom generates a pilot pressure as an operation signal, and transmits said pilot pressure to each flow control valve via a pilot line. The vibration generating means is provided in a signal generating means for generating an automatic vibration signal of the second boom based on the set frequency, and in a pilot line of the operating means of the second boom, An automatic vibration valve that operates in response to the automatic vibration signal generated by the signal generating means. 6. The automatic vibration device for an articulated machine according to claim 5, wherein the operating means of the second boom has first and second two pressure reducing valves, and the flow control valve of the second boom is The first and second two pressure reducing valves have first and second two hydraulic drive units connected via respective pilot lines, and the automatic vibration valve is configured such that the first pressure reducing valve is a first pressure reducing valve. A first pressure connecting the first pressure reducing valve to the second hydraulic drive, a first position connecting the second pressure reducing valve to the second hydraulic drive, and a second pressure reducing valve connecting the second pressure reducing valve to the second hydraulic drive. An automatic vibration device for an articulated working machine, characterized in that it is a directional switching valve switchable between a second position where the valve is connected to a first hydraulic drive.