JP2002308572A - Lifter device for heavy load - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifter device for heavy loads by appropriately arranging hydraulic jack cylinders to lower ridigity required for an upper frame. SOLUTION: This lifter device 10 lifting/lowering the upper frame 20 by expansion/contraction of each hydraulic jack cylinder 1-8 and supporting a lateral load acting on the frame 20 by each cylinder 1-8 comprises a pair of front side hydraulic jack cylinders 1, 2 arranged along a short side 21 in front of the frame 20 and expanding/contracting, crossing with each other, a pair of rear side hydraulic jack cylinders 3, 4 arranged along a short side 22 in the rear of the frame 20 and expanding/contracting, crossing with each other, and pairs of hydraulic jack cylinders 5, 6, 7, 8 arranged between the cylinders 1, 2 and the cylinders 3, 4 and along right and left long sides 23, 24 of the frame 20 and expanding/contracting crossing with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a lifter device for lifting and lowering a heavy object.

[0002]

2. Description of the Related Art A transport carrier for transporting a bridge exceeding several hundred tons has a lifter device for lifting and lowering the bridge mounted on the vehicle, so that the transported bridge can be lifted while mounted on the vehicle.

Conventionally, a lifter device disclosed in Japanese Patent Application Laid-Open No. 11-201088 has a structure in which a lower frame 110, 120 and an upper frame 114 are disposed as shown in FIGS. Four pairs of hydraulic jack cylinders 13a to 13c, 23a to 23c are provided, which extend and contract while crossing each other, and each of the hydraulic jack cylinders 13a to 13c, 23a to
The upper frame 114 is moved up and down by the expansion and contraction operation of 23c, and the hydraulic jack cylinders 13a to 13c,
The lateral loads acting on the upper frame 114 are supported by 23a to 23c.

[0004]

However, in such a conventional heavy lifter device, the hydraulic jack cylinders 13a to 13c and 23a to 23c are arranged symmetrically about the point P, Hydraulic jack cylinders 13a to 13c, 23a to 23c for frame 114
Are not arranged along each side of the upper frame 114, the bending moment acting on the upper frame 114 caused by the lateral load may increase, and the rigidity required for the upper frame 114 increases. However, there is a problem that the weight of the upper frame 114 is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a heavy lifter device capable of reducing the rigidity required for an upper frame by appropriately arranging a hydraulic jack cylinder. I do.

[0006]

According to a first aspect of the present invention, a plurality of pairs of hydraulic jack cylinders are provided between a lower frame and an upper frame so as to intersect and extend. Let me
The present invention is applied to a heavy lifter device that supports a lateral load acting on the upper frame by each hydraulic jack cylinder.

[0007] A pair of front hydraulic jack cylinders, which are formed along the front side of the upper frame, are formed along the front side of the upper frame and extend and intersect with each other. A pair of rear hydraulic jack cylinders that are arranged along the rear side and intersect with each other and extend and contract, and are disposed between the front hydraulic jack cylinder and the rear hydraulic jack cylinder along the left and right sides of the upper frame. At least a pair of hydraulic jack cylinders that are arranged and extend and contract to intersect with each other are provided.

According to a second aspect of the present invention, in the first aspect, a pair of left hydraulic jack cylinders arranged along the left side of the upper frame and intersecting and expanding with each other, and arranged along the right side of the upper frame. And a pair of right-side hydraulic jack cylinders that extend and contract to cross each other.

According to a third aspect, in the first or second aspect, the connecting portion of each hydraulic jack cylinder to the upper frame is arranged substantially symmetrically with respect to the center line X, Y of the upper frame in a plan view. did.

In a fourth aspect based on the third aspect, the hydraulic jack cylinders are arranged to be inclined with respect to the center lines X and Y of the upper frame in a plan view.

In a fifth aspect based on the sixth aspect, the hydraulic jack cylinders are arranged substantially symmetrically with respect to the center lines X and Y of the upper frame in a plan view.

[0012]

In the first aspect of the present invention, the front hydraulic jack cylinder and the rear hydraulic jack cylinder are arranged along the front and rear short sides of the upper frame, respectively. By supporting the lateral load in the left-right direction, the bending moment caused by the lateral load is reduced, and the weight of the upper frame and the like is reduced.

In the second invention, since the left hydraulic jack cylinder and the right hydraulic jack cylinder are respectively disposed along the left and right long sides of the upper frame, the lateral load acting on the upper frame at four support points in the front-rear direction. Is supported, the bending moment caused by the lateral load is reduced, and the weight of the upper frame and the like is reduced.

In the third and fourth aspects of the present invention, the pair of hydraulic jack cylinders extending and contracting in an intersecting manner does not offset the connection of each hydraulic jack cylinder to the upper frame in a plan view. The bending moment generated by the lateral load acting on the upper frame is reduced, and the weight of the upper frame and the like is reduced.

In the fifth invention, since the hydraulic jack cylinders are arranged substantially symmetrically in a plan view, a bending moment generated by a lateral load acting on the upper frame is reduced, and the weight of the upper frame and the like is reduced. .

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 denotes a lifter device mounted on a transport carrier for transporting a bridge or the like. The lifter device 10 includes a lower frame 30 fixed to a vehicle body, and A frame 20 and eight hydraulic jack cylinders 1 to 8 connecting the upper and lower frames 20 and 30 are provided, and the upper frame 20 is moved up and down as the hydraulic jack cylinders 1 to 8 expand and contract.

Each of the hydraulic jack cylinders 1 to 8 has the same structure in which the rod 12 projects from the cylinder 11 by hydraulic pressure, and has the same shape with the same dimensions of each part. FIG.
As shown in FIG. 5, the base end of each cylinder 11 is rotatably connected to the lower frame 30 via the lower bracket 13, and the distal end of each rod 12 is rotatable to the upper frame 20 via the upper bracket 14. Linked to

The upper and lower frames 20, 30 are formed in a substantially rectangular shape, and the upper frame 20 has front and rear short sides 21, 22 and left and right long sides 23, 24. The upper and lower frames 20, 30
May be formed in a substantially square shape.

Assuming that the center line of the upper frame 20 extending in the left-right direction of the vehicle is a horizontal center line X and the center line of the upper frame 20 extending in the front-rear direction of the vehicle is a vertical center line Y,
0 and 30 are formed substantially symmetrically with respect to the center lines X and Y. The lifter device 10 is mounted so that the longitudinal direction of the lifter device 10 extends in the traveling direction of the transport carrier.

Each of the hydraulic jack cylinders 1 to 8 is provided to be inclined with respect to a vertical line, and a plurality of pairs of front hydraulic jack cylinders 1, 2 and rear hydraulic jack cylinders 3, 4, which extend and contract with each other. The hydraulic cylinders are divided into left hydraulic jack cylinders 5 and 6 and right hydraulic jack cylinders 7 and 8 to support a lateral load acting on the upper frame 20.

FIG. 2 is a plan view of the lifter device 10 as viewed from above. The front hydraulic jack cylinders 1 and 2, the rear hydraulic jack cylinders 3 and 4, the left hydraulic jack cylinders 5 and 6, the right hydraulic jack cylinder 7, Numerals 8 are respectively arranged along the front, rear, left and right sides 21 to 24 of the lifter device 10.

Each of the hydraulic jack cylinders 1 to 8 is provided so as to be located as far outward as possible in a plan view, and the rear hydraulic jack cylinders 3 and 4 are separated from the front hydraulic jack cylinders 1 and 2 to the maximum extent. At the same time, the right hydraulic jack cylinders 7, 8 are arranged so as to be separated from the left hydraulic jack cylinders 5, 6 as much as possible.

The front hydraulic jack cylinders 1, 2 and the rear hydraulic jack cylinders 3, 4 are arranged substantially symmetrically with respect to a horizontal center line X in a plan view. Similarly, the left hydraulic jack cylinders 5, 6 and the right hydraulic jack cylinders 7, 8 are arranged substantially symmetrically with respect to the vertical center line Y in the plan view. Thereby, the load on each of the hydraulic jack cylinders 1 to 8 is equalized.

FIG. 3 is a front view of the lifter device 10 as viewed from the front. The front hydraulic jack cylinders 1 and 2 extend in the left-right direction, and are provided side by side so as to intersect and extend so as not to interfere with each other. .

Each connecting portion (upper bracket 14) of the front hydraulic jack cylinders 1 and 2 to the upper frame 20 is disposed substantially symmetrically with respect to the vertical center line Y. The upper brackets 14 of the front hydraulic jack cylinders 1 and 2 have a vertical center line Y
Are arranged on a line A orthogonal to the vertical axis and are arranged so as to be substantially equidistant about the vertical center line Y.

The front hydraulic jack cylinders 1 and 2 are arranged substantially parallel to each other in a plan view so as not to interfere with each other. Front hydraulic jack cylinder 1,
2 to arrange the upper brackets 14 substantially symmetrically about the vertical center line Y.
Are arranged obliquely with respect to the horizontal center line X in the plan view.

The rear hydraulic jack cylinders 3, 4 also extend in the left-right direction similarly to the front hydraulic jack cylinders 1, 2, and are arranged side by side so as to intersect and extend so as not to interfere with each other.

Each connecting portion (upper bracket 14) of the rear hydraulic jack cylinders 3, 4 to the upper frame 20 is arranged substantially symmetrically with respect to the vertical center line Y. Each of the upper brackets 14 of the rear hydraulic jack cylinders 3 and 4 has a vertical center line Y
Are arranged on a line B orthogonal to the vertical axis and are arranged so as to be substantially equidistant about the vertical center line Y.

The rear hydraulic jack cylinders 3, 4 are arranged substantially parallel to each other in a plan view so as not to interfere with each other. Rear hydraulic jack cylinder 3,
In order to arrange the upper brackets 14 of FIG. 4 substantially symmetrically about the vertical center line Y, the rear hydraulic jack cylinders 3, 4
Are arranged obliquely with respect to the horizontal center line X in the plan view.

FIG. 4 is a side view of the lifter device 10 as viewed from the right. The right hydraulic jack cylinders 7 and 8 extend in the front-rear direction and are arranged side by side so as to intersect and extend so as not to interfere with each other. .

Each connecting portion (upper bracket 14) of the right hydraulic jack cylinders 7, 8 to the upper frame 20 is arranged substantially symmetrically with respect to the horizontal center line X. Each of the upper brackets 14 of the right hydraulic jack cylinders 7 and 8 has a horizontal center line X.
Are arranged on a line D orthogonal to the horizontal axis and are arranged so as to be substantially equidistant about the horizontal center line X.

The right hydraulic jack cylinders 7, 8 are arranged substantially parallel to each other in a plan view so as not to interfere with each other. Right hydraulic jack cylinder 7,
In order to arrange each upper bracket 14 of FIG. 8 substantially symmetrically with respect to the horizontal center line X, the right hydraulic jack cylinders 7, 8
Are arranged obliquely with respect to the vertical center line Y in the plan view.

The left hydraulic jack cylinders 5, 6 also extend in the front-rear direction similarly to the right hydraulic jack cylinders 7, 8, and are arranged side by side so as to intersect and extend so as not to interfere with each other.

Each connecting portion (upper bracket 14) of the left hydraulic jack cylinders 5, 6 to the upper frame 20 is arranged substantially symmetrically with respect to the horizontal center line X. Each of the upper brackets 14 of the right hydraulic jack cylinders 7 and 8 has a horizontal center line X.
Are arranged on a line C which is orthogonal to the horizontal axis, and are arranged so as to be substantially equidistant with respect to the horizontal center line X.

The left hydraulic jack cylinders 5, 6 are arranged substantially parallel to each other in a plan view so as not to interfere with each other. Left hydraulic jack cylinder 5,
In order to arrange each upper bracket 14 of FIG. 6 substantially symmetrically about the horizontal center line X, the left hydraulic jack cylinders 5, 6
Are arranged obliquely with respect to the vertical center line Y in the plan view.

The oil chambers of the front hydraulic jack cylinders 1 and 2, the rear hydraulic jack cylinders 3 and 4, the left hydraulic jack cylinders 5 and 6, and the right hydraulic jack cylinders 7 and 8 are:
Driving oil pressure and tank pressure are selectively guided through switching valves, respectively connected to four hydraulic circuits (not shown). A multi-pump having four discharge ports is used as a driving hydraulic pressure source. The control device (not shown) controls the hydraulic jack cylinders 1 to 8 in synchronization with each other.
In response to a signal from a sensor that detects the height of each of the front, rear, left, and right parts of
The operation of each switching valve is controlled to move up and down to the target position at every mm pitch.

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

As shown in FIG. 3 and FIG.
In a state in which the hydraulic jack cylinders 1 to 8 are seated on the lower frame 30, all the hydraulic jack cylinders 1 to 8 are contracted. When the upper frame 20 is raised, the hydraulic jack cylinders 1 to 8 are extended by guiding the drive hydraulic pressure from the pump to the respective end-side oil chambers and guiding the tank pressure to the rod-side oil chambers. When lowering the upper frame 20, each hydraulic jack cylinder 1
-8 are contracted by guiding the drive hydraulic pressure from the pump to the respective rod-side oil chambers and guiding the tank pressure to the respective end-side oil chambers.

As shown in FIG. 1, when the upper frame 20 is lifted away from the lower frame 30, each of the hydraulic jack cylinders 1 to 8 is extended and supports a vertical load acting on the upper frame 20. A lateral load acting on the upper frame 20 due to an earthquake or the like is supported by the compressive or tensile force of each of the hydraulic jack cylinders 1 to 8. Since only the compression load in the axial direction acts on each of the hydraulic jack cylinders 1 to 8, it is not necessary to use a hydraulic jack cylinder having a special structure. Down is measured.

The front hydraulic jack cylinders 1, 2, the rear hydraulic jack cylinders 3, 4, the left hydraulic jack cylinders 5, 6, and the right hydraulic jack cylinders 7, 8 which extend and contract with each other cross each other, are attached to each side 21 of the upper frame 20. To 24, so that the lateral load acting on the upper frame 20 is supported in all directions of front, rear, left and right. Thereby, the lifter device 10 which does not require a horizontal support mechanism such as a caesar jack can be provided. By increasing the distance between the support points with respect to the upper frame 20, the bending moment generated by the lateral load acting on the upper frame in the left-right direction is reduced, and the weight of the upper frame and the like can be reduced.

The front hydraulic jack cylinders 1 and 2 and the rear hydraulic jack cylinders 3 and 4 which extend and contract each other cross each other,
Each connection part to upper frame 20 (upper bracket 14)
Are arranged substantially symmetrically about the vertical center line Y,
Since the lateral load acting on the upper frame 20 in the left-right direction is supported by the four support points arranged substantially symmetrically about the vertical center line Y, the rotational moment generated by the lateral load acting on the upper frame 20 in the left-right direction is reduced. I do.

The left hydraulic jack cylinders 5 and 6 and the right hydraulic jack cylinders 7 and 8 which extend and contract cross each other,
Since the connecting portions (upper brackets 14) of the upper frame 20 are arranged substantially symmetrically with respect to the horizontal center line X, the four supporting points which are arranged substantially symmetrically with respect to the horizontal center line X act on the upper frame 20. By supporting the lateral load in the front-rear direction, the rotational moment generated by the lateral load acting on the upper frame 20 in the left-right direction is reduced.

Further, since the hydraulic jack cylinders 1 to 8 are arranged substantially symmetrically in the plan view, the bending moment generated by the lateral load acting on the upper frame 20 is reduced.

In this way, by reducing the rotational moment generated in the upper frame 20 due to the lateral load in all directions, front and rear, left and right, the rigidity required for the upper frame 20 can be suppressed small, and the weight of the upper frame 20 and the like can be reduced.

As another embodiment, a pair of hydraulic oil pressures, which intersect and contract with each other along the vertical center line Y of the upper frame 20, between the front hydraulic jack cylinders 1 and 2 and the rear hydraulic jack cylinders 3 and 4. A jack cylinder may be provided. In this case, the lateral load acting on the upper frame 20 in the front-rear direction is supported by the two support points.
Although it is necessary to increase the rigidity required for 0, a total of 6
The structure of the lifter device 10 can be simplified by supporting the upper frame 20 with the hydraulic jack cylinder.

As another embodiment, the lifter device 10 may be mounted on a carrier so that the short sides 21 and 22 of the upper frame 20 extend in the front-rear direction and the long sides 23 and 24 extend in the left-right direction. .

The upper frame 20 is connected to the short sides 21 and
2 and the long sides 23 and 24 may be formed to have the same length.

It is obvious that the present invention is not limited to the above-described embodiment, but can be variously modified within the technical concept thereof.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lifter device according to an embodiment of the present invention.

FIG. 2 is a plan view of the lifter device.

FIG. 3 is a front view of the lifter device.

FIG. 4 is a side view of the lifter device.

FIG. 5 is a three-view drawing of a lifter device showing a conventional example.

[Explanation of symbols]

 1-8 Hydraulic jack cylinder 10 Lifter device 13 Lower bracket 14 Upper bracket 20 Upper frame 30 Lower frame

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayoshi Ishii 2-4-1 Hamamatsucho, Minato-ku, Tokyo World Trade Center Building Kayaba Industry Co., Ltd. (72) Inventor Masaji Go 2-chome Hamamatsucho, Minato-ku, Tokyo No.4-1 World Trade Center Building Kayaba Industry Co., Ltd. F-term (reference) 2D059 DD06

Claims (5)

[Claims] A plurality of pairs of hydraulic jack cylinders are provided between a lower frame and an upper frame so as to intersect and extend with each other. The upper frame is moved up and down by the expansion and contraction of each hydraulic jack cylinder, and the upper frame is moved by each hydraulic jack cylinder. A lifter device for a heavy object that supports a lateral load acting on the upper frame, wherein the upper frame is formed in a substantially rectangular shape having front and rear sides and left and right sides, and is arranged along the front side of the upper frame and crosses each other to expand and contract. A pair of front hydraulic jack cylinders, a pair of rear hydraulic jack cylinders arranged along the rear side of the upper frame and intersecting and expanding with each other, and a pair of front hydraulic jack cylinders and rear hydraulic jack cylinders And at least one pair of hydraulic jack cylinders arranged along the left and right sides of the upper frame and intersecting and expanding with each other, Lifter device heavy, characterized in that there was e. 2. A pair of left hydraulic jack cylinders arranged along a left side of the upper frame and extending and intersecting with each other, and a pair of left hydraulic jack cylinders arranged along a right side of the upper frame and extending and intersecting with each other. The lifter device according to claim 1, further comprising: a right hydraulic jack cylinder. 3. A connection part of each of the hydraulic jack cylinders with respect to the upper frame is arranged substantially symmetrically with respect to a center line X, Y of the upper frame in a plan view. Heavy lifter device. 4. The lifter device according to claim 3, wherein each of the hydraulic jack cylinders is arranged to be inclined with respect to a center line X, Y of the upper frame in a plan view. 5. The lifter device according to claim 4, wherein the hydraulic jack cylinders are arranged substantially symmetrically about a center line X, Y of the upper frame in a plan view.