JPH068146Y2 - Work attachment for lifting loads - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a work attachment for hanging loads for hanging concrete U-shaped grooves and the like, and particularly for loads applied to civil engineering construction machines such as excavator excavators. Regarding work attachments for hanging.

[Conventional technology]

Conventionally, a vacuum suction type load lifting device having a balance arm for holding an article is mounted on a facility and a traveling device in a factory,
It is used as a dedicated machine for lifting loads.

By the way, if the above-mentioned machine for exclusive use of cargo is used for laying concrete U-shaped grooves and fume pipes in the construction industry, fine positioning is possible for laying U-shaped grooves, etc. Easy and quick. However, since this type of load lifting device cannot be used for anything other than load lifting,
There is a problem that the initial cost is high and the investment efficiency is low.

Therefore, if the vacuum adsorption type load lifting device can be mounted as a work attachment of a shovel excavator or the like, problems such as initial cost and investment efficiency can be solved.

[Problems to be solved by the device]

However, since the vacuum suction type load lifting device having a balance arm for handling an article is provided with a turning axis for turning itself in a horizontal direction, if this axis is tilted with respect to a vertical line, the balance arm The suspended load naturally moves in the tilting direction of the swivel axis, which hinders the work of laying a U-shaped groove or the like, reduces the safety of the work, and results in burdening the operator with extra labor.

Further, in a work machine having an outrigger capable of adjusting the inclination of the machine body such as a truck crane or a wheel crane, the machine body can be supported horizontally with respect to the ground.
Although the turning axis of the load lifting device can be adjusted vertically, the crawler type excavator excavator does not have a tilt adjustment mechanism like an outrigger, so a vacuum suction load lifting device with a balance arm can be used for excavator excavation. At present, it cannot be used as a work attachment for hanging a machine.

The present invention has been made in view of the above-mentioned problems, and can be used as a work load attachment for a work machine such as an outrigger that does not have a posture adjustment mechanism, and a work work attachment for simple posture adjustment operation. The purpose is to provide.

[Means for Solving the Problems]

A work attachment for lifting a load according to the present invention comprises a load lifting device having a load balance arm mechanism for holding an article, and an attitude adjusting device for suspending and supporting the load lifting device on a working machine. The device has an upper bracket and an intermediate bracket which are connected so as to be capable of relative swing in one direction, and a lower bracket which is connected to the intermediate bracket so as to be capable of relative swing in a direction perpendicular to the swing direction, and the upper bracket and the intermediate bracket. Are connected by a hydraulic cylinder that regulates relative swing between them and a hydraulic cylinder that regulates relative swing between the intermediate bracket and the lower bracket, and an open / close valve is provided between both chambers defined by the pistons of these hydraulic cylinders. Are connected in a closed circuit.

[Action]

In the present invention, when the work attachment is empty and the pivot axis is vertical due to its own weight, and each opening / closing valve is opened, the two chambers of each hydraulic cylinder communicate with each other through the valve. Relative swing between the upper bracket and the intermediate bracket, and between the intermediate bracket and the lower bracket, enables the swing axis of the load lifting device to be automatically vertical, and when the on-off valve is closed, both chambers of each hydraulic cylinder are closed. The space is cut off and a fixed state is established, whereby the turning axis of the load lifting device is fixed vertically.

Therefore, according to the present invention, the posture adjustment operation of the work attachment is simplified, and the work attachment can be used as an attachment for hanging a work machine without a posture adjustment mechanism.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 is an overall configuration diagram when a work attachment for hanging a load according to the present invention is applied to an excavator excavator such as a backhoe.

In the figure, a shovel excavator 1 is shown as a crawler body 2,
Further, the crawler main body 2 is provided with a pedestal 3 installed so as to be horizontally rotatable, and a cockpit 4 is provided on the pedestal 3. The lower end of the first boom 5 is tiltably supported on the front side of the gantry 3, and the first boom 5 is tilted by a hydraulic cylinder 6. A second boom 7 is attached to the tip of the first boom 5 so as to be vertically rotatable, and the second boom 7 is vertically rotated by a hydraulic cylinder 8. A work attachment 9 for hanging a load is attached to the tip of the second boom 7.

The work attachment 9 for lifting loads includes a lifting device 10 with a balance arm, and an attitude adjusting mechanism 11 for vertically supporting the lifting device 10 on the tip of the second boom 7 of the excavator excavator 1. ing.

The posture adjusting mechanism 11 has an upper bracket 12, an intermediate bracket 13, and a lower bracket 14 as shown in FIGS. 2 and 3, and the front and rear surfaces of the upper bracket 12 and the intermediate bracket 13 are opposed to each other. The connecting portions 12a and 12b and the connecting portions 13a and 13b are respectively provided at both ends, and the connecting portion 1 on the front end side among these connecting portions is provided.
2a, 13a and the connecting portions 12b, 13b on the rear end side,
Each of them is fitted to both ends of a common hinge shaft 15 overlapping each other at their central apexes, thereby connecting the upper bracket 12 and the intermediate bracket 13 so as to be relatively swingable right and left about the hinge shaft 15. .

In addition, on the surfaces of the intermediate bracket 13 and the lower bracket 14 that face each other, the connecting portions 13 are located at both left and right ends thereof.
c, 13d and connecting portions 14a, 14b are respectively provided in a protruding manner, and the connecting portions 13c, 14a on the left end side of these connecting portions are provided.
And the connecting portions 13d and 14b on the right end side are fitted to both ends of a common hinge shaft 16 which is perpendicular to the hinge shaft 15 by overlapping their central apexes with each other, whereby the intermediate bracket 13 and the lower bracket are attached. 1
4 are connected to each other about the hinge shaft 16 so as to be relatively swingable back and forth.

Reference numeral 17 denotes a double rod type first hydraulic cylinder that regulates a relative swinging motion between the upper bracket 12 and the intermediate bracket 13. The first hydraulic cylinder 17 is arranged in a state of standing in the center of the right side surface of the upper bracket 12. The middle portion of the cylinder tube 17a is pivotally attached to the support portion 18 projecting from the upper bracket 12 so as to be rotatable in the left-right direction, and the tip of the piston rod 17b extending downward is located on the right side of the intermediate bracket 13. It is rotatably connected to the center of the edge by a pin joint. Further, the oil inlet / outlet ports 19a, 19a are provided at the upper and lower ends of the cylinder tube 17a.
b is provided, and these oil inlet / outlet ports 19a, 19
One ends of hydraulic hoses 20a and 20b are connected to b, respectively, and the other ends are connected to a needle valve 21. By opening the needle valve 21, the first hose is divided by a piston (not shown) of the first hydraulic cylinder 17. On
By connecting the lower chamber (not shown) through hydraulic hoses 20a and 20b, the upper bracket 12 and the intermediate bracket 13 are allowed to relatively swing about the hinge shaft 15, and the needle valve 21 is closed. The oil passage between the upper and lower chambers of the first hydraulic cylinder 17 is cut off so that relative swing motion between the upper bracket 12 and the intermediate bracket 13 is restricted.

Reference numeral 22 denotes a second rod type second rod that restricts relative swinging motion between the intermediate bracket 13 and the lower bracket 14.
In the hydraulic cylinder, the second hydraulic cylinder 22 is arranged in an upright state in the center of the rear surface of the intermediate bracket 13, and the intermediate portion of the cylinder tube 22a thereof is the intermediate bracket 1
The piston rod 22b is pivotally attached to the supporting portion 23 projecting from the upper portion 3 so as to be rotatable in the front-rear direction, and the tip of the piston rod 22b extending downward has a supporting portion 2 provided at the rear side edge of the lower bracket 14.
4 is rotatably connected by a pin joint.
Further, oil inlet / outlet ports 25a, 25b are provided at the upper and lower ends of the cylinder tube 22a. One end of each hydraulic hose 26a, 26b is connected to each oil inlet / outlet port 25a, 25b, and the other end is a needle. By connecting the valve 27 and opening the needle valve 27, the upper and lower chambers (not shown) partitioned by the piston (not shown) of the second hydraulic cylinder 22 are connected to the hydraulic hoses 26a, 26b.
The intermediate bracket 13 and the lower bracket 14 are allowed to swing relative to each other around the hinge shaft 16, and the needle valve 27 is closed to close the oil between the upper and lower chambers of the second hydraulic cylinder 22. The path is blocked so that relative swing motion between the intermediate bracket 13 and the lower bracket 14 is restricted.

At the center of the lower surface of the lower bracket 14 of the attitude adjuster 11 configured as described above, a swivel shaft 28 is attached by a supporting member 28a vertically and rotatably around the shaft, and further at the lower end of the swivel shaft 28. The load lifting device 10 is attached in a suspended state.

In addition, the upper bracket 12 is the excavator excavator 1
Pin 29 for attaching a bucket (not shown) of
The ends of the second boom 7 and the piston rod 30a of the bucket operating cylinder 30 are rotatably connected via a link 31 by a and 29b.

As shown in FIG. 1, the load lifting device 10 includes a posture adjusting mechanism 1
The support frame 3 fixed to the lower end of the turning shaft 28 of No. 1 in a suspended state
2, a load balance arm mechanism 33 for supporting the load in a balanced state is attached to the support frame 32.

The load balance arm mechanism 33 includes a load suspension arm 34,
The upper arm 35 and the lower arm 36 which are parallel to each other and are connected to the upper end of the load suspension arm 34 by a pin joint, and the other end of the upper arm 36 and the lower arm 36.
Connecting arm 3 connected by a pin joint so as to be parallel to the load suspension arm 34 between the outer side and the middle part of the
7, the upper arm 35 and the pin joint portion of the connecting arm 37 are supported by the support frame 32 so as to be movable in the horizontal direction, and the substantially middle portion of the lower arm 36 is movable in the vertical direction by the support frame 32. The intermediate support portion of the lower arm 36 is connected to a piston rod of a hydraulic cylinder 38 that supports the load and the entire arm. The hydraulic cylinder 38 is swingably supported by the support 32. Also, a counterweight 39 is attached to the other end of the lower arm 36.
Also, the vacuum generator 40 is fixed.

A suction mechanism 42 connected to the vacuum generator 40 by a suction tube (not shown) is provided at the lower end of the load-hanging arm 34.
Is swingably mounted, and the suction pad 42a of the suction mechanism 42 can suction and hold the concrete U-shaped groove 43 and the like. Further, 44 is the load-carrying arm 3
4 is a handle provided at the lower end of the arm 4 for operating the arm. 45,
Reference numeral 46 denotes front and rear, left and right level meters attached to the right side surface and the front surface of the support frame.

Next, the operation of this embodiment configured as described above will be described.

When laying concrete U-shaped grooves or fume pipes using the shovel excavator (backhoe etc.) 1, first, the second boom 5 and the second boom 7 are laid down on the ground surface and then the second The upper bracket 12 of the attitude adjusting mechanism 11 is connected to the tip end of the boom 7 and the bucket operating cylinder 30 by the bucket mounting pins 29a and 29b. After that, the hydraulic cylinders 6 and 8 are operated to raise the first and second booms 5 and 7 as shown in FIG. 1, and the entire work attachment 9 for hanging a load is suspended from the tip of the boom in the air. Hold. At this time, the work attachment 9 for suspending the load is set in an unloaded state so that the turning axis L is substantially vertical due to its own weight. And each needle valve 2
1 and 27 are opened, and each hydraulic cylinder 1
Between the upper and lower chambers 7, 22, hydraulic hoses 20a, 20b, 2
The communication is maintained via 6a and 26b. As a result, it becomes possible to relatively swing between the upper bracket 12 and the intermediate bracket 13 and between the intermediate bracket 13 and the lower bracket 14 of the attitude adjusting mechanism 11, so that the attitude adjusting mechanism 11 in this state is used. When all the loads are applied, the turning axis L of the entire load lifting device 10 including the posture adjusting mechanism 11 becomes vertical.

Here, as shown in FIG. 1, a level meter 45 for providing vertical in the front-back direction and a level meter 46 for providing vertical in the left-right direction are installed on the lower end side of the support frame 32 of the load lifting device 10 as viewed from the operator 50 side. Therefore, the worker has these level meters 45, 46.
Work attachment 9 for hanging loads while watching
Is slightly moved back and forth and left and right to adjust its posture. When the pointers of the level meters 45 and 46 coincide with the reference line, it is determined that the turning axis L is correctly vertical, and each needle valve 21, Close 27. As a result, the pistons of the hydraulic cylinders 17 and 22 are fixed,
The relative swinging motion between the brackets is restricted, and the turning axis of the work attachment 9 for lifting loads is fixed vertically.

Using the work attachment 9 for lifting the load after the turning axis L is centered, for example, a U-shaped groove 4 made of concrete is used.
When the load of 3 or the like is to be suspended, the U-shaped groove 43 is vacuum-pressed to the boom of the excavator excavator 1 by the suction pad 42a of the load balancing arm mechanism 33 of the work attachment 9 for suspending the load that is attached in a suspended state. Then, it is adsorbed as shown in FIG. At this time, the weight of the concrete U-shaped groove 43 on the load suspension arm 34 and the weight of the load balance arm mechanism 33 are supported by the hydraulic cylinder 38, and are balanced by the counterweight 39 and the vacuum generator 40. The concrete U-shaped groove 43 held by the suction mechanism 42 can be moved to a predetermined position only by gripping the handle 44 of the load-carrying arm 34 and giving a slight force by the worker 50. Suitable for laying work such as U-shaped groove and fume pipe that require proper positioning.

In this embodiment as described above, the posture adjusting mechanism 11 is attached to the upper end of the load lifting mechanism 10 having the load balance arm mechanism 33, and the posture adjusting mechanism 11 is attached to the boom tip of the shovel excavator 1 at the bucket end. Since it is mounted using pins, the load lifting device with load balance arm mechanism can be easily used as a work attachment for lifting the excavator excavator. Since it can also be used as a load suspending device for the U-shaped groove, the fume pipe, etc., the initial cost of the excavator can be reduced and the investment efficiency can be improved.

Further, the posture is adjusted by the upper and middle brackets 12 and 13 connected to each other so as to be relatively swingable in the left-right direction, and the lower bracket 14 connected to the intermediate bracket 13 so as to be relatively swingable in the left-right direction perpendicular to the swing direction. A hydraulic cylinder 17 that constitutes the mechanism 11 and restricts relative swing between the upper bracket 12 and the intermediate bracket 13 and a hydraulic cylinder 22 that restricts relative swing between the intermediate bracket 13 and the lower bracket 14 are assembled. Further, since the upper and lower chambers partitioned by the pistons of the hydraulic cylinders 17 and 22 are connected in a closed circuit via the needle valves 21 and 27, the needle valve 2
The turning axis L can be made vertical only by finely adjusting the posture of the work attachment 9 for lifting the load in the left and right directions and the front and rear directions by opening and closing 1, 27.
By simply closing 7, the work attachment 9 for lifting loads
The turning axis L can be fixed vertically, the adjustment operation of the posture adjusting mechanism 11 is simple and quick, and the load lifting operation rate can be improved.

Further, it can be used as an attachment for hanging a work machine without an attitude adjusting mechanism such as an outrigger.

In the present invention, the valve that opens and closes the closed circuit of the hydraulic cylinder is not limited to the needle valve.

[Effect of device]

As described above, according to the present invention, the posture adjusting mechanism for suspending and supporting the load suspending device having the load balance arm mechanism on the working machine is connected to the upper and middle brackets that are relatively swingable in one direction. A hydraulic cylinder constituted by a lower bracket connected to the intermediate bracket so as to be relatively swingable in a direction perpendicular to the swing direction, and restricting relative swing between the upper bracket and the intermediate bracket; and an intermediate bracket The hydraulic cylinders that regulate the relative swing between the lower bracket and the lower bracket are assembled, and the two chambers defined by the pistons of these hydraulic cylinders are connected in a closed circuit via open / close valves. The vertical adjustment operation of the pivot axis of the work attachment for hanging the suspended load is quick and easy, and there is no posture adjustment mechanism such as an outrigger. There is an effect that can be used as a business machine of the suspended load attachment.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram in which a work attachment for hanging a load according to the present invention is applied to a shovel excavator. FIG. 2 is an enlarged front view of the posture adjusting mechanism in this embodiment. FIG. 3 is a right side view of FIG. [Explanation of Signs of Main Parts] 1 ... Excavator excavator (work machine) 5, 7 ... Boom 9 ... Work attachment for load lifting 10 ... Load lifting device 11 ... Posture adjusting mechanism 12 ... Upper bracket 13 ... Intermediate bracket 14 ... Lower bracket 15, 16 ... Hinge shaft 17, 22 ... Hydraulic cylinder 20a, 20b, 26a, 26b ... Hydraulic hose 21, 27 ... Needle valve (open / close valve) 28 ... Swivel shaft 32 ... Support frame 33 ... Load balance arm mechanism.

Claims (1)

[Scope of utility model registration request] 1. A load suspending device having a load balance arm mechanism for holding an article, and a posture adjusting device for suspending and supporting the load suspending device on a working machine, wherein the posture adjusting device is unidirectional. An upper and intermediate brackets that are swingably connected, and a lower bracket that is relatively swingably connected to the intermediate bracket in a direction perpendicular to the swing direction,
And both chambers that are connected by a hydraulic cylinder that regulates relative swing between the upper bracket and the intermediate bracket and a hydraulic cylinder that regulates relative swing between the intermediate bracket and the lower bracket, and that are partitioned by pistons of these hydraulic cylinders. A work attachment for lifting loads, characterized in that the spaces are connected via a switching valve in a closed circuit.