JP2000127924A - Jack-up device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability and safety while swinging a swinging beam by a link between a storage position and a jack-up position by utilizing driving force of a jack cylinder. SOLUTION: An coverhang beam 12 of a jack-up device 11 is provided in a truck frame 2 of a lower part running unit 1, a swinging beam 16 and a jack cylinder 19 are provided in a tip end side of the overhang beam 12. A link 21 is provided between the overhang beam 12 and a rod 19B of the jack cylinder 19. The swinging beam 16 it turned in a vertical direction between a storage position and a jack up position through the link 21 by driving force in an extending/contracting direction of the rod 19B when it is extended/ contacted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jack-up device for a construction machine suitably used for jacking up a vehicle such as a crane.

[0002]

2. Description of the Related Art In general, a jack-up device provided on a construction machine such as a crane is rotatably provided on a track frame via an overhanging beam or the like on the track frame. The pivot beam is pivoted to one of the storage position bent upward and the jack-up position parallel to the track frame, and the rod faces downward when the pivot beam is in the jack-up position. And a jack cylinder fixedly provided to the rotating beam in a state of expanding and contracting.

A conventional jack-up device of this kind is used when a crane is transported using, for example, a trailer. For this reason, when performing civil engineering and construction work using a crane, the rotating beam is held in the storage position where it has been rotated upward, and the rod of the jack cylinder is reduced to the minimum position so that the tip end of the rod is positioned on the track frame. The vehicle is held at a position higher than the lower surface, so that the minimum ground clearance of the vehicle is as large as possible.

When the crane is transported or the like, an operator or the like manually rotates the rotating beam downward from the storage position to the jack-up position, and then drives the jack cylinder to move the rod downward. By extending, the crane vehicle is jacked up from the ground. Thus, when the vehicle is jacked up, the left and right crawler belts can be removed from the vehicle, and the width of the vehicle can be reduced by the projecting dimension of the crawler belt to accommodate the vehicle within a range defined by traffic regulations and the like. , Such as a trailer, can be moved to the lower side of the vehicle, and the vehicle can be dropped on the carrier.

After the crane is transported, the vehicle of the crane is lowered from a trailer or the like using a jack-up device, and then the turning beam is manually turned upward from the jack-up position and returned to the storage position. It has a configuration.

[0006]

However, in the above-mentioned prior art, when the jack-up device is used, the turning beam is manually turned to thereby arrange the turning beam at the jack-up position. Then, a storing operation for returning the rotating beam to the storing position is performed.

However, the turning beam is provided with a large jack cylinder for jacking up the vehicle body of a huge crane, and the turning beam itself is made of a metal material to support the vehicle body. Due to their strength, they are heavy structures attached to the distal end of the overhang beam.

For this reason, when installing and storing the rotating beam, the rotating beam, the jack cylinder, etc., which are heavy objects, are manually rotated. Particularly, in the storing operation, the jack is rotated while rotating these. In the prior art, since it is necessary to lift from the up position to the storage position, not only enormous effort is required for the installation and storage work of the rotating beam, but also the safety at the time of work is easily reduced, and a crane or the like is required. There is a problem that the vehicle cannot be smoothly jacked up.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the prior art, and it is an object of the present invention to enable the turning beam to be easily turned between the retracted position and the jack-up position. Another object of the present invention is to provide a jack-up device for a construction machine, which can perform a storing operation smoothly and can improve workability and safety when jacking up a vehicle.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a truck frame of a construction machine, and is provided rotatably at the tip end of the truck frame, and is bent upward with respect to the truck frame. The pivot beam is pivoted to one of the retracted storage position and the jack-up position that is parallel to the track frame, and the rod extends and contracts downward when the pivot beam is in the jack-up position. The present invention is applied to a jack-up device of a construction machine including a jack cylinder provided with a tube fixed to the rotating beam.

A feature of the structure adopted by the first aspect of the present invention is that, between the track frame and the tip end of the rod of the jack cylinder, when the rod is reduced into the tube, the rotating beam is in the retracted position. A link is provided for holding and pivoting the pivot beam to the jack-up position when the rod extends from the tube.

With this structure, when the rod of the jack cylinder expands and contracts from the tube, the link generates a force in the rotational direction of the rotating beam by using the driving force in the expansion and contraction direction. Force can be applied to the rod from the link. As a result, when the rod extends and contracts, the rotating beam and the jack cylinder can be rotated between the retracted position and the jack-up position in accordance with the expansion and contraction operation.

[0013] In the invention of claim 2, the track frame is provided with a bracket located below the center of rotation of the turning beam and rotatably attached to a base end side of the link, The rod of the jack cylinder is provided with a mounting hole that is located on the protruding end side of the rod that always protrudes from the tube, and the distal end side of the link is removably mounted. When the rod is held and the rod is reduced to the minimum position, the rod is formed to have a length dimension for connecting between the bracket and the mounting hole.

[0014] Thus, the tip (projecting end) of the rod and the bracket of the track frame can be connected by the link. And, by disposing the bracket below the center of rotation of the rotating beam, when the rod is extended, the link generates a reaction force that pulls the distal end side of the rod downward by using the driving force in the extending direction. By this reaction force, the turning beam can be turned downward from the storage position to the jack-up position via the jack cylinder. Similarly, when the rod is contracted, the link uses the driving force in the contraction direction to generate a reaction force that pulls the distal end of the rod upward, thereby causing the rotating beam to move upward from the jack-up position to the storage position. Can be rotated.

Further, according to the third aspect of the present invention, the track frame is provided with a stopper which comes into contact with the turning beam when the turning beam turns from the retracted position to the jack-up position.

With this arrangement, when the rod of the jack cylinder is extended, the rotating beam that rotates with the rod can be brought into contact with the stopper at the jack-up position, and the rotating beam rotates beyond the jack-up position. Movement can be prevented by the stopper.

Further, according to the invention of claim 4, the track frame is provided with a projecting beam extending outward.
The rotating beam is rotatably provided at the tip side of the overhanging beam.

Thus, the rod extends from the tube,
When reducing, the rotating beam can be rotated on the tip side of the overhang beam.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a jack-up device for a construction machine according to an embodiment of the present invention will be described in detail with reference to FIGS.

Reference numeral 1 denotes a lower traveling body constituting the lower side of the crane. A track frame 2 of the lower traveling body 1 has a center frame 3 located at the center thereof,
And a left and right side frame (not shown) around which a pair of crawler belts 4, 4 are wound.

Reference numeral 5 denotes an upper revolving structure provided on the lower traveling structure 1 so as to be revolvable. A front 7 having a tower boom 7A and the like is attached to the revolving frame 6 of the upper revolving structure 5 so as to be able to move up and down. is there.

.., 11,...
1 and 2, each jack-up device 11 is provided with a projecting beam 12 and a rotating beam 1 which will be described later.
6, the jack cylinder 19, the link 21 and the like.

Reference numeral 12 denotes an overhang beam provided on the center frame 3. The overhang beam 12 is connected at its base end to the center frame 3 using a connection pin 13, and is rotatable in the horizontal direction. Further, the projecting beam 12 has a tip end projecting outward from the center frame 3, and a storage pin hole 12 </ b> A for fixing the rotation beam 16 to a storage position described later, and a rotation beam A projecting pin hole 12B for fixing the screw 16 to a jack-up position described later is provided.

Further, on the side surface of the overhanging beam 12, a stopper 14 abuts against the rotating beam 16 when the rotating beam 16 rotates from the retracted position to the jack-up position.
Is protruding. A bracket 15 for connecting the link 21 is provided on the lower surface of the overhanging beam 12, and the bracket 15 is disposed below the center of rotation of the rotation beam 16 (a connection pin 17 described later). .

Numeral 16 denotes a rotating beam provided on the overhanging beam 12. The rotating beam 16 is connected at its base end to the lower end of the overhanging beam 12 using a connecting pin 17, and is indicated by a solid line in FIG. And a jack-up position extending in the horizontal direction with respect to the overhanging beam 12 as shown by an imaginary line. . Further, a pin hole 16A is provided on the base end upper side of the rotating beam 16, and a positioning pin 18 is removably inserted into the pin hole 16A.

During civil engineering and construction work using a crane, the positioning pin 18 is inserted into the storage pin hole 12A of the extension beam 12 via the pin hole 16A, whereby the rotating beam 16 is fixed at the storage position. ing.

When the jack-up device 11 is used, the positioning beam 18 is inserted into the projecting pin hole 12B of the projecting beam 12 via the pin hole 16A as described later, so that the rotating beam 16 is moved. Fixed in jack-up position.

Further, the turning beam 16 is turned to the jack-up position and the storage position via the link 21 by the driving force of the jack cylinder 19. That is, when the rod 19B of the jack cylinder 19 extends, the pivot beam 16 is pivoted downward from the storage position to the jack-up position by the link 21, and when the rod 19B contracts, the pivot beam 16 is moved to the jack-up position. From the storage position to the storage position.

Reference numeral 19 denotes a jack cylinder provided at the tip end of the rotating beam 16. The jack cylinder 19 is provided with a tube 19A fixed to the rotating beam 16 and when the rotating beam 16 is in the jack-up position. The tube 1
9A and a rod 19B that expands and contracts downward. The tube 19A is attached to the rod 19B.
A mounting hole 20 (see FIG. 4) for connecting the link 21 is provided at a protruding end side of the rod 19B which always protrudes from the rod.

Then, as shown in FIG.
Is held at the storage position, the distal end of the rod 19B is at a height h1 from the ground, and this height h1 is larger than the height h2 on the lower surface side of the track frame 2 (h1> h2). In a jack-up operation to be described later, as shown in FIG. 4, the rotating beam 16 is fixed at the jack-up position, and the rod 19B of the jack cylinder 19 is moved.
Is extended downward, thereby jacking up the crane vehicle from the ground.

Reference numerals 21 and 21 denote a pair of left and right links provided in each jack-up device 11, respectively.
As shown in FIG. 1 and FIG. 2, the base end side is rotatably connected to the bracket 15 of the overhang beam 12 using the connecting pin 22. In addition, the distal end side of the link 21 is always pin-removably connected to the mounting hole 20 of the jack cylinder 19 by using the mounting pin 23.
As shown in the figure, the pin is attached to a pin hole 24 for temporary fixing provided in the track frame 2, for example.

Here, the link 21 is, as shown in FIG.
When the rod 19B of the jack cylinder 19 is reduced to the minimum position in the tube 19A while holding the rotating beam 16 in the storage position, the rod 19 is formed in advance with a length dimension connecting the bracket 15 and the mounting hole 20. I have. Thereby, when the rod 19B is reduced to the minimum position,
As described later, the rotating beam 16 can be reliably rotated to the storage position.

The rod 19 of the jack cylinder 19
When extending B from the tube 19A, the rod 1
9B is moved in a direction away from the bracket 15, the distance between them is kept constant by the link 21, and the bracket 15 is disposed below the rotation center of the rotation beam 16. Therefore, the distal end of the rod 19B is restricted so as to move downward along an arc-shaped trajectory K centered on the connecting pin 22.

Therefore, when the rod 19B extends from the minimum position to a certain position shown in FIG. 3, a driving force in the extending direction generates a reaction force that pulls the distal end of the rod 19B downward via the link 21. The pivot beam 16 is pivoted downward about the connecting pin 17 from the storage position to the jack-up position.

On the other hand, when the rod 19B contracts from the expanded state into the tube 19A, the rod 19B
Due to the driving force at the time of contraction, a reaction force is generated that pulls the distal end of the rod 19B upward through the link 21, and the rotating beam 16 is returned from the jack-up position to the storage position.

The jack-up device 11 for a crane according to the present embodiment has the above-described configuration, and its operation will be described next.

First, during civil engineering and construction work using a crane, the rotating beam 16 is retracted by reducing the rod 19B of the jack cylinder 19 to the minimum position, and the tip end of the rod 19B is positioned higher than the lower surface of the track frame 2. The construction and construction work can be performed with the minimum ground clearance of the crane as large as possible.

When carrying a crane or the like,
In order to use the jack-up device 11, first, an installation operation of rotating the turning beam 16 from the storage position to the jack-up position is performed. In this installation work, after the positioning pins 18 are extracted from the overhang beam 12 and the rotation beam 16, the jack cylinder 19 is driven to drive the rod 19.
Extend B from tube 19A.

As a result, the turning beam 16 is pulled downward through the link 21 by the driving force of the jack cylinder 19, and is turned together with the jack cylinder 19 from the storage position to the jack-up position. And rod 1
When 9B extends from the minimum position to the position shown in FIG.
The pivoting beam 16 reaches the jack-up position and abuts against the stopper 14 to restrict its pivoting operation, and the pin hole 16A of the pivoting beam 16 is aligned with the projecting pin hole 12B of the projecting beam 12. It will be in the state that was done.

Therefore, as shown in FIG. 4, a positioning pin 18 is inserted into these pin holes 12B and 16A to fix the rotating beam 16 at the jack-up position. Also, the mounting pin 23 is removed from the mounting hole 20 of the jack cylinder 19 and the link 21, the link 21 is rotated toward the track frame 2, and the distal end of the mounting pin 23 is pinned by the mounting pin 23 on the track frame 2 side. Attach to
Further, a pedestal 25 is disposed on the ground at the position of each jack-up device 11.

Next, in the jack-up operation shown in FIG. 5, the rod 19B of the jack cylinder 19 is further extended downward, so that the pedestal 2 which has been placed in advance.
The vehicle of the crane is jacked up from the ground through 5 or the like. In this state, the crawler belt 4 can be attached to and detached from the lower traveling body 1, and the crane vehicle can be raised and lowered from a transport trailer or the like.

On the other hand, the rotating beam 1
When performing the storing operation of 6, the positioning pin 18 is pulled out, the distal end side of the link 21 is attached to the mounting hole 20 of the rod 19B, and then the rod 19B is reduced to the minimum position in the tube 19A. As a result, the turning beam 16 is turned upward by the driving force of the jack cylinder 19 via the link 21 and returned to the storage position together with the jack cylinder 19, so that the turning beam 16 is moved to the positioning pin 18.
Fixed by.

Thus, in this embodiment, since the link 21 is provided between the bracket 15 provided on the overhanging beam 12 and the rod 19B of the jack cylinder 19, when the rod 19B expands and contracts from the tube 19A, The link 21 generates a reaction force in the rotation direction of the rotation beam 16 by using the driving force in the expansion and contraction direction, and the rotation beam 16 and the jack cylinder 19 can be rotated by the reaction force.

Thus, for example, when starting or ending the jack-up operation, only by extending and contracting the rod 19B, the rotating beam 16 and the like can be easily moved between the storage position and the jack-up position in accordance with the extension / contraction operation. Can be rotated.

Therefore, the worker or the like can move the heavy rotating beam 16.
It is no longer necessary to manually rotate the rotating beam, etc.
6 can be installed and stored smoothly,
By simply adding the link 21 and the like to the jack-up device of the prior art, without greatly changing the specifications thereof,
The workability and safety of jack-up work can be reliably improved.

Also, since the bracket 15 for the link 21 is provided on the extension beam 12 and the mounting hole 20 is provided on the rod 19B of the jack cylinder 19, the bracket 15 and the mounting hole 20 are used to protrude. The link 21 can be stably connected between the beam 12 and the rod 19B.

In this case, the bracket 15 is connected to the rotating beam 1
6, the driving force in the direction of extension of the rod 19B is transmitted when the rod 19B is extended.
By means of 1, a downward rotating force can be transmitted to the distal end side of the rod 19B, and the rotating beam 16 can be smoothly rotated downward from the storage position.

The distal end of the link 21 is detachably attached to the attachment hole 20 of the rod 19B by using an attachment pin 23, and the pin hole 24 is provided on the track frame 2 side. After rotating the rotating beam 16 to the jack-up position, the distal end side of the link 21 can be removed from the mounting hole 20 and temporarily locked in the pin hole 24. Thereby, the rod 19B
Can be further extended to perform a jack-up operation of the vehicle, and the attachment state of the link 21 can be stabilized during this operation.

Further, a stopper 14 is attached to the overhang beam 12.
When the rod 19B of the jack cylinder 19 is extended, the rotating beam 16 can be brought into contact with the stopper 14 at the jack-up position, and the rotating beam 16 is rotated beyond the jack-up position. Can be reliably prevented, and the link 21 and the like can be protected.

In the above embodiment, the single link 21 is used as the link. However, the present invention is not limited to this, and the link between the bracket 15 of the overhang beam 12 and the rod 19B of the jack cylinder 19 is not limited to this. A plurality of links may be connected and provided.

In the above embodiment, the rotating beam 16 is provided on the track frame 2 via the projecting beam 12, but the present invention is not limited to this, and the projecting beam 1 is not limited to this.
2 is omitted, and the rotating beam 1 is
6 may be directly attached.

Further, in the above embodiment, the crane is taken as an example of the construction machine, but the present invention is not limited to this, and the construction in which the jack-up device 11 is provided in another construction machine such as a hydraulic shovel or the like is provided. It may be.

[0053]

As described in detail above, according to the first aspect of the present invention, the link is provided between the track frame and the tip of the rod of the jack cylinder. The link can be used to generate a reaction force in the direction of rotation of the rotating beam using the directional driving force. Thus, for example, when starting or ending the jack-up operation, the rod is extended,
Just by reducing it, this beam expands and contracts,
The jack cylinder and the like can be easily rotated between the storage position and the jack-up position. Therefore, it is not necessary to manually rotate the heavy rotating beam or the like, and the installation and storage of the rotating beam can be performed smoothly, and the workability and safety of the jack-up operation are reliably improved. be able to.

According to the second aspect of the present invention, a bracket is provided on the track frame, a mounting hole is provided on the rod of the jack cylinder, and a link corresponds to the storage position of the rotating beam and the minimum position of the rod. Because the length dimension is adopted, the bracket of the track frame and the mounting hole at the end of the rod of the jack cylinder can be stably connected by a link, and the rotating beam etc. is jacked up with the retracted position as the rod expands and contracts. It can be reliably rotated between the position. Further, after the rotating beam reaches the jack-up position, the distal end side of the link is removed from the mounting hole to further extend the rod, so that the vehicle can be jacked up.

Further, according to the third aspect of the present invention, since the stopper is provided on the track frame, when the rod of the jack cylinder is extended, the turning beam is turned beyond the jack-up position. Can be reliably prevented by the stopper, and the link and the like can be protected.

According to the fourth aspect of the present invention, since the rotating beam is provided on the track frame via the extending beam, when the rod is extended or contracted from the tube, the rotating beam is extended. It can be rotated on the tip side of the beam.

[Brief description of the drawings]

FIG. 1 is a front view showing a crane to which an embodiment of the present invention is applied.

FIG. 2 is an enlarged side view showing a jack-up device for a crane according to an embodiment of the present invention.

FIG. 3 is a side view of a jack-up device and the like showing a state in which a turning beam is turned from a storage position to a jack-up position.

FIG. 4 is a side view of a jack-up device and the like showing a state in which a distal end side of a link removed from a jack cylinder is attached to a track frame side.

FIG. 5 is a front view of the crane showing a state in which the jack-up device is driven to jack up the vehicle.

[Explanation of symbols]

 2 Track frame 11 Jack-up device 12 Overhang beam 14 Stopper 15 Bracket 16 Rotating beam 19 Jack cylinder 19A Tube 19B Rod 20 Mounting hole 21 Link

Claims (4)

[Claims] 1. A track frame of a construction machine, a storage position rotatably provided at a tip end side of the track frame and bent upward with respect to the track frame, and a jack-up position parallel to the track frame. A rotating cylinder that is pivotally moved to one of the positions, and a jack cylinder provided with a tube fixed to the rotating beam in a state where the rod expands and contracts downward when the rotating beam is in the jack-up position. A jack-up device for a construction machine, comprising: between the track frame and a tip of a rod of a jack cylinder, the rod is held in a retracted position when the rod is reduced into a tube, and the rod is a tube. A link for rotating the rotating beam to the jack-up position when extended from Set machine of the jack-up device. 2. The track frame is provided with a bracket located below the center of rotation of the rotation beam and rotatably attached to a base end of the link, and a rod of the jack cylinder is provided on a rod of the jack cylinder. A mounting hole is provided at a protruding end side of a rod that always projects from the tube, and a distal end side of the link is removably attached to the link. 2. The jack-up device for a construction machine according to claim 1, wherein the jack-up device is formed to have a length dimension for connecting the bracket and the mounting hole when reduced to a position. 3. The construction machine according to claim 1, wherein the track frame is provided with a stopper that comes into contact with the turning beam when the turning beam turns from the storage position to the jack-up position. Jack-up device. 4. The construction machine according to claim 1, wherein the track frame is provided with an overhanging beam extending outward, and the rotating beam is rotatably provided at a tip end side of the overhanging beam. Jack-up device.