JP3822152B2 - Working machine with boom and method of using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a work machine with a boom configured by attaching work attachments to the tip of a boom in a plurality of stages, and a method of using the work machine.
[0002]
[Prior art]
The prior art will be described with reference to a dismantling machine which is a preferred example of the present invention.
[0003]
In FIG. 5, reference numeral 1 denotes a crawler type lower traveling body, and an upper revolving body 2 is mounted on the lower traveling body 1 so as to be rotatable about a vertical axis. In addition, a bending-extending boom 3 is detachably attached, and a crusher 4 for crushing a concrete wall or the like as a work attachment is attached to the tip of the boom 3 to constitute a demolition machine.
[0004]
The boom 3 is composed of boom bodies 5 to 8 in a plurality of stages (four stages from the first stage to the fourth stage in the figure, which will be described in this example), which are sequentially pin-connected, and the connecting pins serve as fulcrums. The crusher 4 can be moved in accordance with the working position by the bending (extending up to four) action and the undulation action of the entire boom.
[0005]
9 is a first boom cylinder (hydraulic cylinder; the same applies to each boom cylinder below) for raising and lowering the first stage boom body 5 (the entire boom 3), and 10 is a second stage relative to the first stage boom body 5. A second boom cylinder for bending and extending the boom body 6, 11 is a third boom cylinder for bending and extending the third-stage boom body 7 with respect to the second-stage boom body 6, and 12 is the third-stage boom body 7. 4 is a fourth boom cylinder for bending and extending the fourth-stage boom body 8.
[0006]
The crusher 4 includes an openable / closable clamp 14 that is rotatably mounted around the horizontal shaft 13 at a boom tip (tip of the fourth stage boom body 8), and a clamp rotating cylinder (hydraulic cylinder) for rotating the clamp 14 ) 15 and an opening / closing cylinder (see FIG. 7) 16 for opening and closing the clamp 14.
[0007]
The hydraulic circuit of this demolition machine is shown in FIGS.
[0008]
Hydraulic pilot-type control valves 18 to 23 are provided in the pipelines connecting the boom cylinders 9 to 12 and the clamp rotation and open / close cylinders 15 and 16 and the hydraulic pump 17, and these control valves 18 to 23 are respectively illustrated. The operation of each cylinder 9-12, 15, 16 is controlled by the pilot pressure from the remote control valve that is not. T is a tank.
[0009]
In this dismantling machine, for example, when the work height is lowered due to the progress of work, the fourth boom body 8 of the boom 3 is removed and converted to the three-stage boom shown in FIG. At this time, the crusher 4 is attached to the tip of the third stage boom body 7 by the horizontal shaft 13.
[0010]
With the change from the four-stage boom (long boom mode) to the three-stage boom (short boom mode), the fourth boom cylinder 12 is unnecessarily removed, and as shown in FIG. The distal ends of the both-side hydraulic pipes 24, 24 are closed with plugs 25, 25. 7 and 8, reference numerals 26 and 26 denote expansion / contraction hydraulic pipes for the opening / closing cylinder 16.
[0011]
Since the load capacity of the dismantling machine is increased by shortening the boom 3, the crusher 4 is usually replaced with a large one as shown in order to make use of the increased load capacity in the crushing capacity.
[0012]
[Problems to be solved by the invention]
In such a demolition machine, since the distance from the hydraulic pump 17 of FIGS. 7 and 8 (installed in the upper swing body 2 of FIGS. 5 and 6) to the clamp rotation and open / close cylinders 15 and 16 is long, the pipeline The pressure loss increases.
[0013]
In particular, in the case of the clamp opening / closing cylinder 16 that operates frequently, there is a problem that the operation becomes slow due to insufficient flow due to pressure loss at both side pipes 26 and 26, and the responsiveness of the crushing operation is lowered.
[0014]
In particular, when the size of the crusher 4 is increased in accordance with the change from the long boom mode to the short boom mode as described above, the cylinder 16 is also increased in diameter, so that the tendency of insufficient flow rate has increased.
[0015]
Note that there is no problem if the diameters of the both-side pipes 26 and 26 are increased. However, since the piping work is very troublesome and the cost of the pipe is high, it is not actually implemented.
[0016]
Such a problem is not limited to the dismantling machine exemplified, but also to a dismantling machine using a vibration drill as a work attachment, and to all working machines with a multi-stage boom, and a solution for this point has been awaited.
[0017]
Therefore, the present invention provides a work machine with a boom that can reduce the pressure loss and increase the flow rate without increasing the diameter of the pipe for the hydraulic actuator for work attachment when switching from the long boom mode to the short boom mode. The method of use is provided.
[0018]
[Means for Solving the Problems]
According to the first aspect of the present invention (a method for using a work machine with a boom), a work attachment driven by a hydraulic actuator is attached to the tip of a boom formed by sequentially connecting a plurality of stages of boom bodies, and the booms are adjacent to each other. A long boom mode with a relatively long boom length and a short boom length are achieved by attaching and detaching the tip-end boom body by a plurality of hydraulic cylinders provided between the boom bodies. In a working machine with a boom that is configured to be switchable between the short boom mode, the hydraulic pressure for bending and extending the distal end boom body that is unnecessary when the mode is switched from the long boom mode to the short boom mode. Connect the cylinder piping to the cylinder to the hydraulic actuator for work attachment at the tip of the boom in short boom mode. It is intended to be connected to that actuator piping.
[0019]
According to a second aspect of the invention, on the premise of the method of the first aspect, in the short boom mode, the control valve for controlling the operation of the hydraulic cylinder for bending and extending the distal end boom body is operated by the interlocking means and the operation of the hydraulic actuator for the work attachment is performed. It operates in conjunction with a control valve that controls the motor.
[0020]
According to a third aspect of the present invention (a work machine with a boom), a work attachment driven by a hydraulic actuator is attached to the tip of a boom formed by sequentially connecting a plurality of boom bodies, and the boom is connected between adjacent boom bodies. The long boom mode with a relatively long boom length and the short boom mode with a short boom length by attaching and detaching the front-end boom body. In the boom-equipped working machine configured to be convertible between the first and second booms in the short boom mode, the cylinder piping for the hydraulic cylinder for bending and extending the distal-end boom body in the long boom mode is provided in the short boom mode. With a connector that connects to the actuator piping for the hydraulic actuator for work attachments. That.
[0021]
According to a fourth aspect of the present invention, in the configuration of the third aspect, a crusher provided with an open / close clamp is attached to the tip of the boom as a work attachment, and the cylinder piping for the hydraulic cylinder for bending and extending the tip side boom body is provided by a connector. The opening / closing clamp is connected to a cylinder pipe for an opening / closing cylinder.
[0022]
The invention of claim 5 controls the operation of the control valve for controlling the operation of the hydraulic cylinder for bending and extending the distal end side boom body and the operation of the hydraulic actuator for work attachment in the short boom mode on the premise of the configuration of claim 3 or 4. Valve interlocking means for operating the control valve in conjunction with it is provided.
[0023]
According to a sixth aspect of the present invention, in the configuration of the fifth aspect, the control valve for controlling the operation of the hydraulic cylinder for bending and extending the distal end boom body and the control valve for controlling the operation of the hydraulic actuator for work attachment are separate remote control valves. It is configured as a hydraulic pilot valve that is switched and operated by the pilot pressure from, and as a valve interlocking means, the pilot line of one of the two remote control valves is branched into two, and both the branch lines are the two control valves. Connected to the pilot port in parallel.
[0024]
According to the working machine with a boom and the method of using the same, piping to the hydraulic cylinder for bending the distal end boom body at the time of switching from the long boom mode to the short boom mode (the fourth boom cylinder piping in the example of the prior art) Is connected to the piping for the hydraulic actuator for work attachment (clamp opening and closing cylinder piping), oil can be supplied to the hydraulic actuator by two systems of piping, or the oil from the actuator can be returned to the tank.
[0025]
In other words, the cylinder pipe that has been conventionally closed with the plug closed and left unused can be used as the second actuator pipe.
[0026]
As a result, the pressure loss of the entire actuator pipe can be reduced and the actuator flow rate per unit time can be increased without increasing the diameter of the actuator pipe.
[0027]
In this case, it is necessary to operate the control valves provided in both pipes at the same time in order to make oil flow through the two pipes at the same time. However, if these two control valves are operated separately, the operation becomes troublesome. On the other hand, the operability deteriorates and it becomes difficult to use.
[0028]
In this regard, according to the method of claim 2 and the work machine of claims 5 and 6, in the short boom mode, the interlocking means (in claim 6, the pilot line of one remote control valve is branched and connected to both control valves. ), The two control valves are operated in an interlocked manner, so that the operation itself may be the same as when both pipes are not connected, and the operability is good.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
[0030]
In this embodiment, in accordance with the description of the prior art, a dismantling machine including a multistage and bending-extending boom 3 is illustrated as an application target.
[0031]
Note that, in the embodiment, the same parts as those shown in FIGS. 5 to 8 are denoted by the same reference numerals, and redundant description thereof is omitted.
[0032]
FIG. 1 shows the situation of the cylinder piping for the boom tip and the fourth boom cylinder 12 and the cylinder piping for the clamp opening / closing cylinder 16 of the crusher 4 in the long boom mode (four-stage boom) shown in FIG. The state of the boom tip and both pipes at the time of switching to the boom mode (three-stage boom) is shown.
[0033]
In both figures, 30 is an expansion / contraction both-side hydraulic piping (hereinafter referred to as boom cylinder piping) for the fourth boom cylinder 12, 31 is an expansion / contraction both-side hydraulic piping (hereinafter referred to as opening / closing cylinder piping) for the clamp opening / closing cylinder 16, Each is provided along the boom 3 from the upper swing body 2 of FIGS. 1 and 2 show the pipes 30 and 31 one by one. Actually, however, two pipes on the expansion side and the contraction side are provided side by side as shown in FIGS.
[0034]
In this case, in the long boom mode (four-stage boom), the boom cylinder pipe 30 is connected to the fourth boom cylinder 12 from the tip of the third-stage boom body 7 as shown in FIGS. Via the step boom body 7, it connects from the front-end | tip of the 4th stage boom body 8 to the clamp opening / closing cylinder 16 (refer FIG.3, 4), respectively.
[0035]
On the other hand, when the fourth-stage boom body 8 is removed from the long boom mode and switched to the short boom mode (three-stage boom), as shown in FIGS. 2 and 4, the uppermost boom in the same mode is used. A connection block (connector) 32 is attached to the third-stage boom body 7 serving as a body, and the tip portions of both the boom cylinder and open / close cylinder pipes 30 and 31 are connected to the connection block 32.
[0036]
The connection block 32 has two sets (four in total) of pump / tank ports 33 and 34 to which both cylinder pipes 30 and 31 are connected, and one set (two) of cylinder ports 35. The tip of the cylinder side pipe 36 connected to is connected to the clamp opening / closing cylinder 16.
[0037]
The pump / tank ports 33 and 34 are connected to the cylinder port 35 in a state where they are in phase communication with each other in the connection block 32 as shown in FIG.
[0038]
Thus, in the short boom mode, the oil separately sent from the hydraulic pump 17 to both the cylinder pipes 30 and 31 merges at the connection block 32 and is supplied to the clamp opening / closing cylinder 16 via the cylinder side pipe 36. The oil discharged from 16 is sent to the connection block 32 via the cylinder side pipe 36, branched here, and then returned to the tank T via both pipes 30 and 31.
[0039]
As described above, the fourth boom cylinder pipe 30 that has been closed with a plug and left unused is conventionally used as the second pipe for the clamp opening / closing cylinder. In order to supply oil to the open / close cylinder 16 or return the oil from the cylinder 16 to the tank T, the pressure loss of the entire cylinder pipe is reduced without increasing the diameter of the cylinder pipe, and the flow rate per unit time Can be increased.
[0040]
For this reason, especially when the crusher 4 (clamp opening / closing cylinder 16) is replaced with a large one in accordance with the conversion to the short boom mode, the cylinder flow rate tends to be insufficient and the response of the operation is poor. The problem of becoming can be solved.
[0041]
By the way, in order to allow oil to flow through the two pipes 30 and 31 at the same time as described above, both the control valves 21 and 23 for the fourth boom cylinder and the clamp opening and closing cylinders provided separately on the pipes 30 and 31 are provided. It is necessary to operate simultaneously.
[0042]
In this case, if both the control valves 21 and 23 are operated separately, the operation becomes troublesome and the operability is deteriorated, making it difficult to use.
[0043]
Therefore, in this embodiment, the configuration shown in FIG. 4 is taken.
[0044]
3 and 4, 37 is a remote control valve for operating the fourth boom cylinder control valve 21, 38 is a remote control valve for operating the clamp opening / closing cylinder control valve 23, and in the long boom mode, FIG. As shown in FIG. 2, pilot pressures from both remote control valves 37 and 38 are supplied to both control valves 21 and 23 by separate pilot lines 39 and 40, and both control valves 21 and 23 operate independently.
[0045]
On the other hand, at the time of switching to the short boom mode, as shown in FIG. 4, the pilot line 39 of the fourth boom cylinder remote control valve 37 is disconnected from the remote control valve 37 and the clamp opening / closing cylinder remote control valve 38 Connected to the pilot line 40.
[0046]
In this way, when the clamp opening / closing cylinder remote control valve 38 is operated in the short boom mode, both control valves 21 and 23 are simultaneously operated to the same side, and therefore the operation itself is the case where both the pipes 30 and 31 are not connected. It may be the same and there is no possibility that the operability is deteriorated.
[0047]
As another interlocking means for interlocking both control valves 21 and 23 as described above, when both remote control valves 37 and 38 are installed close to each other, they are mechanically connected by a link or the like. You may comprise so that both remote control valves 37 and 38 may be operated simultaneously by operation.
[0048]
Further, the present invention is not limited to the demolition machine used by switching between the 4-stage boom and the 3-stage boom, and is switched between the 5-stage boom and the 4-stage boom or between the 3-stage boom and the 2-stage boom. It can be applied to the dismantling machine used.
[0049]
Further, the present invention can be similarly applied to a demolition machine to which a work attachment other than the crusher 4 is attached, a demolition machine using a hydraulic motor as a hydraulic actuator for the work attachment, and a boom-equipped work machine other than the demolition machine. .
[0050]
【The invention's effect】
As described above, according to the present invention, at the time of switching from the long boom mode to the short boom mode, the cylinder pipe for the hydraulic cylinder for the tip side boom body is connected to the actuator pipe for the hydraulic actuator for work attachment. Use the cylinder piping that has been closed and left unused as a second actuator piping, supplying oil to the hydraulic actuator through two systems of piping, or returning the oil from the actuator to the tank be able to.
[0051]
Thereby, the pressure loss of the entire actuator pipe can be reduced and the flow rate per unit time can be increased without increasing the diameter of the actuator pipe.
[0052]
Further, according to the method of claim 2 and the work machine of claims 5 and 6, in the short boom mode, the interlocking means (in claim 6, the pilot line of one remote control valve is branched and connected to both control valves). Therefore, since both control valves are operated in conjunction with each other, the operation itself may be the same as when both pipes are not connected, and the operability is good.
[Brief description of the drawings]
FIG. 1 is a schematic side view of a boom tip portion in a long boom mode showing an embodiment of the present invention.
FIG. 2 is a schematic side view of a boom tip portion in the short boom mode.
FIG. 3 is a hydraulic piping diagram in the same long boom mode.
FIG. 4 is a hydraulic piping diagram in the short boom mode.
FIG. 5 is a schematic side view of a four-stage boom-equipped demolisher that is an application example of the present invention.
FIG. 6 is a schematic side view of the dismantling machine converted to a three-stage boom.
FIG. 7 is a hydraulic piping diagram in the state of FIG. 5;
FIG. 8 is a hydraulic piping diagram in the state of FIG. 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 3 Boom 4 Crusher 5 as work attachment 1st stage boom body 6 of boom 2nd stage boom body 7 3rd stage boom body 8 4th stage boom body 10 2nd boom cylinder 11 3rd boom cylinder 12 4th boom cylinder 14 Clamp 16 for Crusher Clamp Open / Close Cylinder 21 as Actuator for Work Attachment 4 4th Boom Cylinder Control Valve 23 Clamp Open / Close Cylinder Control Valve 24 Pipe for 4th Boom Cylinder 26 Pipe for Clamp Open / Close Cylinder 30 Pipe for 4th Boom Cylinder 31 Piping for clamp open / close cylinder 32 Connection block (connector)
33, 34 Connection block pump / tank port 35 Cylinder port 37 Remote control valve 38 for operating the fourth boom cylinder control valve 38 Remote control valve 39, 40 for operating the clamp opening / closing cylinder control valve Pilot line

Claims (6)

A work attachment driven by a hydraulic actuator is attached to the tip of a boom formed by sequentially connecting a plurality of boom bodies, and the boom is divided into a plurality of upper and lower stages by a plurality of hydraulic cylinders provided between adjacent boom bodies. Work with a boom that is configured to be able to bend and extend, and that can be switched between the long boom mode with a relatively long boom length and the short boom mode with a short boom length by attaching and detaching the tip side boom body At the machine, when switching from the long boom mode to the short boom mode, the cylinder piping for the hydraulic cylinder for bending and extending the tip side boom body, which is not necessary when this mode is changed, is attached to the boom tip in the short boom mode. It is connected to the actuator piping for the hydraulic actuator for work attachment Boom with a working machine how to use that. In the short boom mode, the control valve for controlling the operation of the hydraulic cylinder for bending and extending the distal end boom body is operated by the interlocking means in conjunction with the control valve for controlling the operation of the hydraulic actuator for work attachment. The use method of the working machine with a boom of Claim 1. A work attachment driven by a hydraulic actuator is attached to the tip of a boom formed by sequentially connecting a plurality of boom bodies, and the boom is divided into a plurality of upper and lower stages by a plurality of hydraulic cylinders provided between adjacent boom bodies. Work with a boom that is configured to be able to bend and extend, and that can be switched between the long boom mode with a relatively long boom length and the short boom mode with a short boom length by attaching and detaching the tip side boom body In a machine, a hydraulic actuator for a work attachment in which a cylinder pipe for a hydraulic cylinder for bending and extending the distal-end boom body in the long boom mode is attached to the boom distal end in the short boom mode in the short boom mode. A connector is provided for connecting to the actuator piping for Beam with the work machine. A crusher equipped with an open / close clamp as a work attachment is attached to the tip of the boom, and the cylinder piping for the hydraulic cylinder for bending and stretching the boom on the distal end side is connected to the cylinder piping for the open / close cylinder that opens and closes the open / close clamp by a connector The boom-equipped work machine according to claim 3, wherein the work machine is configured as described above. In short boom mode, valve interlocking means to operate the control valve that controls the operation of the hydraulic cylinder for bending and extending the tip side boom body and the control valve that controls the operation of the hydraulic actuator for work attachment was provided. The work machine with a boom according to claim 3 or 4. 6. The work machine with a boom according to claim 5, wherein the control valve for controlling the operation of the hydraulic cylinder for bending and extending the distal end boom body and the control valve for controlling the operation of the hydraulic actuator for work attachment are pilots from separate remote control valves. It is configured as a hydraulic pilot valve that is switched and operated by pressure, and as a valve interlocking means, the pilot line of one of the two remote control valves is branched into two, and both the branch lines are the pilot ports of the two control valves. A working machine with a boom, characterized in that it is connected in parallel.

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