JPH11100191A - Jack-up device of construction machine and turning method for jack-up cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To tilt a jack-up cylinder by a simple configuration without giving a burden to a worker. SOLUTION: In a jack-up device which has a jack-up cylinder 5 supported centered on a predetermined rotary shaft so as to turn an holds the jack-up cylinder 5 in a condition in which it is substantially vertical for the ground surface when it is used and in a storage condition in which the cylinder 5 is tilted when it is not used, a rope 14 of which both ends can be connected with a tube 5a and a rod 5b of the cylinder 5, respectively, and a rope hooking member 15 by which the rope 14 is stretched around between the tube 5a and the rod 5b are provided. By tilting the cylinder 5 in which the rope 14 pulled due to the expansion of the rod 5b is in a substantially vertical condition toward a storage condition and loosening the rope 14 due to the shrinkage of the rod 5b, the cylinder 5 in the storage condition turns toward the vertical condition due to its empty weight.

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 used for a construction machine such as a crawler crane, and more particularly to a jack-up device in which a jack-up cylinder is tilted and stored when not in use, and rotation of the jack-up cylinder. About the method.

[0002]

2. Description of the Related Art A large construction machine such as a crawler crane needs to be disassembled when transported between sites or the like, and it is necessary to jack up the body when disassembling. Therefore, this type of construction machine is provided with a plurality of jack-up cylinders, and these jacks are used while being fixed in a substantially vertical posture with respect to the ground during the jack-up operation. On the other hand, during traveling or transportation, if the jack-up cylinder is left in a vertical state, there is an inconvenience, such as hitting an obstacle, so that the cylinder is tilted and stored at a position where it does not interfere. For example, Japanese Utility Model 3-6208
Japanese Patent Application Laid-Open No. 5 (1999) -2005 discloses a device in which a cylinder is tilted by using a trunnion protruding from a jack-up cylinder. Also, Japanese Patent Application Laid-Open No. 58-49542 and
JP-A-145552 describes that the cylinder of the outrigger device is tilted when not in use.

[0003]

Conventionally, the tilting / standing operation of the jack-up cylinder is manually performed. However, the jack-up cylinder becomes larger and heavier as the construction machine becomes larger. Manual operation places a heavy burden on the operator. Although it is conceivable to incline the cylinder using the power of a motor or another cylinder, the number of parts increases, the configuration becomes complicated, and the cost is greatly increased.

It is an object of the present invention to provide a jack-up device for a construction machine and a method of rotating the jack-up cylinder which can tilt the jack-up cylinder without giving a burden to an operator with a very simple structure.

[0005]

Means for Solving the Problems Referring to FIGS. 3 and 4 showing one embodiment, the invention of claim 1 is as follows.
A jack-up cylinder 5 rotatably supported by a cylinder holding member 4 about a predetermined rotation axis; the jack-up cylinder 5 is held substantially vertically with respect to the ground when in use; The present invention is applied to a jack-up device of a construction machine in which the up cylinder 5 is held in a retracted state in which the up cylinder 5 is tilted about a rotation axis. And
A rope 14 having both ends connectable to the tube 5a and the rod 5b of the jack-up cylinder 5, respectively, and a rope hooking member 15 around which the rope 14 is wound between the tube 5a and the rod 5b, are provided for extending the rod 5b. The rope 14 to be pulled is tilted toward the retracted state with the jack-up cylinder 5 in a substantially vertical state, and the rod 5 b
The jack-up cylinder 5 in the retracted state is configured to rotate toward the vertical state by its own weight by loosening the rope 14 in accordance with the contraction of the rope, thereby solving the above-mentioned problem. The invention of claim 2 uses the sheave 15 installed on the cylinder holding member 4 as the rope hanging member. According to a third aspect of the present invention, the jack-up cylinder provided on the construction machine is rotated between a use state substantially vertical to the ground and a storage state inclined to the vertical. The method is applied to extend the rod of the jack-up cylinder, pull the rope connected at both ends to the rod and tube, rotate the jack-up cylinder from the use state to the retracted state, and contract the rod to And the jack-up cylinder is rotated from the stored state to the use state by its own weight.

[0006] In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments are used to make the present invention easier to understand. However, the present invention is not limited to this.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a jack-up device for a crawler crane will be described with reference to FIGS. FIG. 1 is a side view of the crawler crane according to the present embodiment, and FIG. 2 is a view of the crawler crane as viewed from the II-II direction. This crawler crane uses a truck frame 2
And an upper revolving superstructure 3 that is rotatably connected to the upper portion thereof via a revolving wheel.

[0008] A boom 31 is connected to the upper revolving unit 3 at the front so as to be able to undulate, and an A frame 32 is provided at the rear.
Is erected. A boom hoisting rope 33 extended from a boom hoisting winch (not shown) provided on the upper rotating body 3 is hung around a bridle 34 and its tip is A.
The other end of the pendant rope 35, which is connected to the top of the frame 32 and one end of which is connected to the bridle 34, is connected to the tip of the boom 31. When the boom hoisting winch is driven, the boom hoisting rope 33 is extended / retracted to change the distance between the bridle 34 and the top of the A frame 32, and accordingly, the boom 31 is raised and lowered via the pendant rope 35. .

A main winding rope 36 drawn out from a main winding winch (not shown) is suspended through a guide sheave 37 at the end of the boom 31, and a hook 38 is attached to the end. By driving the main winding winch, the hook 38 moves up and down via the main winding rope 36. 39
Is a counterweight.

On the other hand, traveling bodies 1a and 1b are attached to both sides of the track frame 2. In addition, a jack beam 4 is rotatably connected in a horizontal plane by a pin 8 at four positions on the front, rear, left and right of the track frame 2.
Jack-up cylinders 5 are respectively connected to the tips of.

As shown in FIGS. 3 to 5, a plate-like mounting portion 5 c is provided integrally with the tube 5 a of each jack-up cylinder 5, and the mounting portion 5 c is rotated by the fixing pin 11 to the jack beam 4. They are freely connected. Mounting part 5
c, a pin hole 5 is provided below the center of rotation (fixed pin 11).
d, while the jack beam 4 is formed with two pin holes 4a and 4b,
Is in the upright posture shown in FIG.
a, and tilts to the storage position shown in FIG.
d overlaps the pin hole 4b. Therefore, as shown in FIG. 5, the lock pin 12 is inserted into the pin hole 4a (4
b) and the pin hole 5d, the cylinder 5 is fixedly held at that position.

At the upper end of the cylinder tube 5a, a fitting 1 is provided.
One end of a pendant rope 14 is connected to the pendant rope 3 via a guide sheave 15 fixed to the jack beam 4, and the other end of the pendant rope 14 can be connected to the cylinder rod 5b. That is, a hook 16 as shown in FIG. 6 is attached to the other end of the pendant rope 14, and the other end of the rope 14 is connected to the rod 5b by hooking the hook 16 in a groove formed at the tip of the rod 5b. The pendant rope 14 is expanded and contracted by the rod 5b.
The cylinder 5 rotates about the fixing pin 11 through the, and a detailed operation thereof will be described later.

The operation of the crawler crane constructed as described above will be described. (1) Jack-up operation In performing the jack-up operation, the jack-up cylinder 5 is fixed in the standing posture of FIG. When the jack-up cylinder 5 is extended, as shown in FIG. 7, the crawler crane body is jack-up via the floor plate 52 and the float 51 grounded on the ground.

(2) Cylinder tilting operation When the jack-up operation and the disassembly operation of the traveling bodies 1a and 1b are completed, it is necessary to tilt the jack-up cylinder 5 until the storage position shown in FIG.
Therefore, first, the rod 5b of the jack-up cylinder 5 is completely contracted in the standing posture shown in FIG. Next, the hook 16 of the pendant rope 14 is hooked into the groove at the tip of the rod 5b. At this time, the pendant rope 14
Is still loose and does not exert any force on the cylinder 5.

Here, the center of gravity of the jack-up cylinder 5 is G, and the center of gravity G when the cylinder 5 is in a completely vertical state.
Assuming that the horizontal distance from the rotation center to the rotation center (fixed pin 11) is L, the product (W
× L), a clockwise moment shown in the figure acts. In a state where the rope 14 is loose, since a force for rotating the cylinder 5 in the counterclockwise direction has not yet been applied, the cylinder 5 is prevented from rotating clockwise only by the lock pin 12 passing through the pin holes 4a and 5d. Have been. For this reason, the standing posture in FIG. 3 is a posture slightly rotated clockwise from the vertical state by the amount of play between the lock pin 12 and the pin holes 4a and 5d. In this position, the lock pin 12 is pressed against the wall surfaces of the pin holes 4a and 5d with a force corresponding to the moment, and the lock pin 12 cannot be pulled out as it is.

Then, the rope 14 is stretched by extending the cylinder rod 5b, and a counterclockwise moment corresponding to W × L is applied to the cylinder 5. Now, the tension of the portion 14a between the tube 5a and the sheave 15 of the rope 14 is P1, the distance from the rotation center (fixing pin 11) to the rope 14a is L1, and the tension of the portion 14b of the rope 14 between the sheave 15 and the rod 5b is P2. Assuming that the distance from the center of rotation (fixed pin 11) to the rope 14b is L2, when W × L = P1 × L1 = P2 × L2 is satisfied, the cylinder 5 balances in a completely vertical posture. In the present embodiment, the above expression is satisfied when the rod 5b is extended by L3. In addition, since the tension of the rope 14 is equal in any part, that is, P1 = P2, the tension is balanced by L1 = L2.

When the cylinder 5 is balanced in a vertical position,
Since the pressing of the lock pin 12 by the wall surfaces of the pin holes 4a and 5d is released, the lock pin 12 can be easily pulled out. When the cylinder rod 5b is gradually extended after the lock pin 12 is removed, the upper end of the cylinder tube 5a is pulled by the pendant rope 14, and the cylinder 5 starts to tilt counterclockwise around the fixing pin 11.

Here, in order to tilt the cylinder 5 in the counterclockwise direction, a moment larger than W × L = P2 × L2 is required. L2 ′ in FIG.
+ Α (α is a very small amount) is the distance from the center of rotation to the rope 14b when extended, and as can be seen from the figure, L
2 ′> L2. Therefore, by extending the rod 5b, P2 × L2 ′> P2 × L2 is satisfied, and the cylinder 5 tilts. Note that the propulsion force P of the cylinder is P × cos θ> P2 where θ is the angle between the direction in which P2 acts and the contraction direction of the rod 5b, and P × cos θ needs to satisfy P2 acting direction component of P. is there.

As shown in FIG. 4, when the stroke of the rod 5b becomes L3 + L4, the cylinder 5 tilts to the retracted position, and the pin hole 5d overlaps the pin hole 4b of the jack beam 4. In this state, if the lock pin 12 is inserted through the pin holes 4b and 5d, the cylinder 5 is fixed in the retracted position. Thereafter, the cylinder rod 5b is completely contracted, and the rod 5b
Then, the hook 16 of the pendant rope 14 is removed from the tip groove. Next, cylinder 5 until jack-up operation is performed.
Holds the storage posture.

(3) Cylinder Standing-Up Operation When jack-up work becomes necessary, the jack beam 4 is rotated to the jack-up work position, and then the jack-up cylinder 5 is set in the standing posture. In order to raise the cylinder rod 5b, first, the hook 16 of the pendant rope 14 is hung on the groove at the tip of the cylinder rod 5b.
b is extended to L3 + L4 to bring the pendant rope 14 into tension. As a result, the lock pin 12 is
b, 5d can be easily removed. Lock pin 12
After pulling out, when the cylinder rod 5b is contracted little by little,
The cylinder has its own weight W for the looseness of the pendant rope 14.
To rotate clockwise, and the rod stroke amount becomes L
When it reaches 3, it will be in a vertical state. In this state, lock pin 1
2 through the pin holes 4a, 5d to fix the cylinder 5,
The rod 5b is contracted to the minimum length and the hook 16 is removed from the rod 5b.

As described above, in the present embodiment, the jack-up cylinder 5 is tilted / erected by its own expansion and contraction by using the pendant rope 14 and the sheave 15, so that the cylinder 5 is tilted / erected with a minimum configuration. Can be performed without human intervention.

In the above embodiment, the jack beam 4 constitutes a cylinder holding member, and the sheave 15 constitutes a rope hooking member.

The number and arrangement of the jack-up cylinders are not limited to the embodiment. Although the description has been made with reference to the crawler crane, the present invention can be applied to a jack-up device of another construction machine.

[0024]

According to the apparatus and method of the present invention, the extension / retraction operation of the jack-up cylinder is used for the tilting / standing operation by using a rope, so that a burden is imposed on the operator with a very simple configuration. The tilting / standing operation of the jack-up cylinder can be performed without the need.

[Brief description of the drawings]

FIG. 1 is a side view of a crawler crane according to an embodiment of the present invention.

FIG. 2 is a view taken along line II-II in FIG.

FIG. 3 is a plan view and a side view showing a standing posture of a jack-up cylinder.

FIG. 4 is a plan view and a side view showing a storage posture of the jack-up cylinder.

FIG. 5 is a view taken along line VV in FIG. 3;

FIG. 6 is a view showing a hook at a tip of a pendant rope.

FIG. 7 is a diagram illustrating a jack-up operation.

[Explanation of symbols]

 1a, 1b Running body 2 Track frame 3 Upper revolving structure 4 Jack beam 4a, 4b Pin hole 5 Jack up cylinder 5a Tube 5b Rod 5c Attachment part 5d Pin hole 8 Pin 11 Fixed pin 12 Lock pin 13 Fixture 14 Pendant rope 15 Guide Sheave 16 Hook 51 Float 52 Sill

Claims (3)

[Claims] 1. A jack-up cylinder supported on a cylinder holding member so as to be rotatable about a predetermined rotation axis. When the jack-up cylinder is in use, the jack-up cylinder is held substantially vertically with respect to the ground. A jack-up device for a construction machine, wherein the jack-up cylinder is held in a retracted state in which the jack-up cylinder is tilted about the rotation axis during use, a rope having both ends connectable to a tube and a rod of the jack-up cylinder, respectively. A rope hooking member around which the rope is looped between the tube and the rod, wherein the rope pulled along with the extension of the rod tilts the jack-up cylinder in the substantially vertical state toward the retracted state. Then, the rope is loosened with the contraction of the rod, and the jack-up cylinder in the retracted state is moved. Jack-up system for a construction machine, characterized by being configured to rotate toward the vertical state by the weight. 2. The jack-up device for a construction machine according to claim 1, wherein the rope hanging member is a sheave installed on the cylinder holding member. 3. A rod of the jack-up cylinder for rotating a jack-up cylinder provided on a construction machine between a use state substantially vertical to the ground and a storage state tilted with respect to the vertical. By stretching the rope, the rope connected at both ends to the rod and the tube is pulled to rotate the jack-up cylinder from the use state to the storage state, and the rod is contracted to loosen the rope and jack-up. A method for rotating a jack-up cylinder, wherein the cylinder is rotated from the stored state to the used state by its own weight.