JP4544274B2 - Construction machine and its dismantling method - Google Patents

Description

  The present invention relates to a construction machine such as a dismantling machine to which a so-called separate boom can be attached and a disassembling method thereof.

  Conventionally, it has a main boom that is connected to the main body of the construction machine in a undulating manner and an arm to which a tip attachment such as a crusher is attached at the tip, and a front boom that is rotatable by a jib cylinder between the arm and the main boom. Construction machines having separate booms connected to each other are known (for example, see Patent Document 1).

  In these construction machines, the main boom and the front boom are usually separated from each other due to the problem of transportation restrictions. In addition, the front boom is separated from the main boom when the separate boom in which the main boom, the front boom, and the arm are connected to another super-long attachment or a dismantling backhoe attachment. Such a construction machine dismantling method is as follows.

In the first conventional dismantling method, as shown sequentially in FIGS.
(1) Remove the tip attachment and ground the tip of the arm 107 to the ground (FIG. 14)
(2) Lift and hold the jib cylinder 112 with the hanger 121 (FIG. 15),
(3) Remove the rod pin 112c that connects the rod 112b of the jib cylinder 112 and the front boom 106 (FIG. 16),
(4) The jib cylinder 112 is reduced (FIG. 17),
(5) (A) Remove the cylinder side piping 115 of the jib cylinder 112,
(A) Remove the tube side pin 112d of the jib cylinder 112,
(C) The jib cylinder 112 is lowered onto the ground together with the cylinder side pipe 115 (FIG. 18),
(6) Remove the main pipe 116 extending from the main boom 104 to the front boom 106 (FIG. 19),
(7) With the arm 107 and the front boom 106 lifted, the front boom foot pin 106c that connects the front boom 106 and the main boom 104 is extracted (FIG. 20).
(8) The arm 107 and the front boom 106 from which the jib cylinder 112 is removed are separated from the main boom 104 (FIG. 21),
(9) The arm 107 and the front boom 106 from which the jib cylinder 112 has been removed are placed on the installation base 123 (FIG. 22).

In the second conventional dismantling method,
(1) 'As in FIG. 14, remove the tip attachment and ground the tip of the arm 107 to the ground.
(2) 'As in FIG. 15, the jib cylinder 112 is lifted and held by a lifting tool 121,
(3) 'As shown in FIG. 23, an extension hose 118 is prepared to extend the cylinder side pipe 115 of the jib cylinder 112, and
(4) 'Remove the tube side pin 112d that connects the tube 112a side of the jib cylinder 112 and the main boom 104,
(5) ′ As shown in FIG. 24, the jib cylinder 112 is reduced,
(6) ′ Although not shown in the drawings, the jib cylinder 112 is cured to the abdominal surface 106a of the front boom 106 with a chain block or the like so as not to damage the front boom 106, and the cylinder side pipe 115, the extension hose 118, and Remove the main pipe 116 extending from the main boom 104,
(7) 'With the arm 107 and the front boom 106 to which the jib cylinder 112 is secured being lifted, the front boom foot pin 106c that connects the front boom 106 and the main boom 104 is extracted,
(8) 'Disconnect the arm 107 and the front boom 106 to which the jib cylinder 112 is secured from the main boom 104,
(9) The arm 107 and the front boom 106 to which the jib cylinder 112 is secured are placed on the installation base 123.

On the other hand, although not shown, a construction machine is known that includes a separate boom in which the main boom is divided into a front end bracket and a main boom body. In this construction machine, the tube side of the jib cylinder is connected to the tip bracket. For this reason, at the time of transportation, it is not necessary to remove the jib cylinder by separating the end bracket from the main boom body.
JP 2004-76524 A

  However, in the first conventional disassembly method, since there is an operation of separating the jib cylinder 112, the time of the entire disassembly operation becomes long, and it is necessary to pack and transport the jib cylinder 112 separately, and further, the reassembly time is also long. There is a problem of becoming.

  Therefore, a method of keeping the jib cylinder 112 connected to the main boom 104 side is also conceivable, but in this method, the total length in the transportation posture becomes long, and the transportation restriction may not be cleared due to the heavy mass. . Further, when reassembling the separate boom to another ultra-long attachment or dismantling backhoe attachment, the jib cylinder 112 is not necessary, and the jib cylinder 112 needs to be disconnected after all.

  In the second conventional method, since the rod 112b is contracted in a state where the tube 112a side of the jib cylinder 112 is lifted, the jib cylinder 112 is slanted and dangerous. Further, as in the step (4) ′, the cylinder side pipe 115 is set to a length that does not stretch or remain when the front boom is rotated, and therefore corresponds to the movement of the tube 12a. In this case, it is necessary to extend the cylinder-side pipe 115, and it is difficult to fix the jib cylinder 112 to the abdominal surface 106a of the front boom 106 by curing the front boom 106, and the work is extremely complicated. there were.

  Furthermore, in a construction machine having a tip bracket, when the tip bracket is connected to the main boom body, the main boom becomes heavy and performance such as stability is lowered. In addition, in order to increase the force that pushes up the front boom by the jib cylinder, the end bracket must be enlarged, and the main boom tends to be long and heavy, especially for medium-sized and small construction machines. There was a problem that it was difficult to realize.

  This invention is made | formed in view of this point, The place made into the objective is to improve assembly-disassembly property, maintaining performance, without changing a boom dimension significantly.

  In order to achieve the above object, the present invention facilitates disassembly of the jib cylinder.

Specifically, in the first invention,
The construction machine body,
A main boom connected to the main body of the construction machine in a undulating manner;
A front boom pivotably connected to the main boom;
A jib cylinder that rotates the front boom by extending and contracting;
An arm rotatably connected to the front boom;
Targeting a construction machine with a tip attachment attached to the tip of the arm,
The jib cylinder has a tube side connected to the front boom and a rod side connected to the main boom.

  According to the above configuration, the tube side of the jib cylinder is on the front boom side, and the piping is connected to the jib cylinder from the front boom side. For this reason, if the rod pin on the main boom side is pulled out without extending the pipe, the jib cylinder can be reduced. Moreover, since the tube side that hardly moves during the reduction operation is hung, the hanging work is safe and simple. Further, the jib cylinder, the front boom and the arm are integrally removed from the main boom.

In the second invention, in the first invention,
The front boom is provided with a lifting hook for lifting the jib cylinder.

  According to said structure, if a securing member, such as a chain block, is hung on a lifting hook, a jib cylinder can be lifted and secured without using a crane.

In the third invention, in the second invention,
A cylinder abutting portion for projecting a tube of the jib cylinder when the jib cylinder is secured is protruded from the abdominal surface of the front boom.

  According to said structure, the pipe | tube and bracket in a front boom abdominal surface are not damaged by overtightening by making the tube of a jib cylinder contact | abut to a cylinder contact part. Further, the jib cylinder is securely and easily secured to the front boom without curing the front boom.

In the fourth invention, a construction machine main body,
A main boom connected to the main body of the construction machine in a undulating manner;
A front boom pivotably connected to the main boom;
A jib cylinder that rotates the front boom by extending and contracting;
An arm rotatably connected to the front boom;
A method of disassembling a construction machine having a tip attachment attached to the tip of the arm,
The dismantling method above is
Remove the tip attachment and ground the tip of the arm to the ground.
Lift and hold the jib cylinder with a lifting tool,
Remove the rod pin that connects the rod of the jib cylinder and the main boom,
Reduce the jib cylinder,
The jib cylinder is lifted to the cylinder abutting portion protruding from the abdominal surface of the front boom by lifting the jib cylinder, and secured to the front boom with a securing member,
Remove the pipe that extends from the main boom to the front boom,
Lift the arm and the front boom to which the jib cylinder is secured,
Pull out the front boom foot pin that connects the front boom and the main boom,
The arm and the front boom to which the jib cylinder is secured are separated from the main boom and placed on an installation base.

  According to the above configuration, the tube side of the jib cylinder is on the front boom side, and the piping is connected to the jib cylinder from the front boom side. For this reason, if the rod pin on the main boom side is pulled out without extending the pipe, the jib cylinder can be reduced. Moreover, since the tube side that hardly moves during the reduction operation is hung, the hanging work is safe and simple. Further, the jib cylinder, the front boom and the arm are integrally removed from the main boom.

In the fifth invention, in the fourth invention,
The jib cylinder is lifted by hanging the tying member on a lifting hook provided on the front boom.

  According to said structure, if a securing member, such as a chain block, is hung on a lifting hook, a jib cylinder can be lifted and secured without using a crane.

In the sixth invention, in the fourth or fifth invention,
The tube of the jib cylinder is brought into contact with a cylinder contact portion projecting from the front surface of the front boom, and the jib cylinder is secured to the front boom with a securing member.

  According to said structure, the pipe | tube and bracket in a front boom abdominal surface are not damaged by overtightening by making the tube of a jib cylinder contact | abut to a cylinder contact part. Further, the jib cylinder is securely secured to the front boom without curing the front boom.

  As described above, according to the first and fourth inventions described above, piping is extended by disassembling the jib cylinder having the tube side connected to the front boom and the rod side connected to the main boom. Therefore, it is possible to hang a tube with little movement during the reduction operation, so that it is possible to work quickly, and the jib cylinder, front boom and arm can be removed as a whole, so the work man-hour is greatly reduced. The In addition, it is not necessary to change the boom dimensions significantly, and assembly / disassembly can be greatly improved while maintaining performance.

  According to the second and fifth aspects of the invention, the lifting member provided on the front boom is hooked with a tying member so that the jib cylinder can be lifted and secured. Since it is not necessary, the assembly and disassembly can be greatly improved.

  According to the third and sixth inventions described above, the jib cylinder is brought into contact with and secured to the cylinder contact portion projecting from the front surface of the front boom, so that the pipes and brackets on the front boom surface are damaged. Since the jib cylinder can be securely and easily secured to the front boom while preventing the assembly, disassembly and disassembly can be greatly improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a construction machine 1 according to an embodiment of the present invention. The construction machine 1 includes a lower traveling body 2 and an upper revolving body 3 as a construction machine body that is rotatably mounted on the lower traveling body 2. Yes.

  A main boom 4 is connected to a front portion (not shown) of the upper swing body 3 so as to be raised and lowered. The main boom 4 can be raised and lowered by a pair of right and left hoisting cylinders 5 whose tube side is rotatably connected to the front portion and whose rod side is rotatably connected to an intermediate side surface of the main boom 4. By connecting various attachments to the main boom 4, the construction machine 1 can be used for various purposes.

  In the present embodiment, a so-called separate boom is connected. That is, the front boom 6 is rotatably connected to the tip of the main boom 4. An arm 7 is rotatably connected to the front end of the front boom 6. The arm 7 is connected to the rear surface of the front boom 6 so as to be rotatable, and can be rotated by an arm cylinder 8 having a rod connected to the base end of the arm 7.

  A tip attachment such as a crusher (not shown) can be attached to the tip of the arm 7. The distal end attachment can be rotated by a distal end cylinder 10 whose tube side is rotatably connected to the rear surface of the proximal end of the arm 7 and whose rod side is connected to the proximal end of the distal end attachment.

  As a feature of the present invention, the front boom 6 has a tube 12a side rotatably connected to the abdominal surface 6a of the front boom 6 and a rod 12b side rotatably connected to the abdominal surface of the main boom 4. It can be turned.

  As shown in enlarged views in FIGS. 10 to 12, lifting hooks 13 for lifting the jib cylinder 12 are provided on the left and right side surfaces 6 b on the abdominal surface 6 a side of the front boom 6. The shape of the lifting hook 13 is not particularly limited as long as it has at least a hook-like portion. In the present embodiment, the lifting hook 13 includes a hook-shaped hook portion 13a and a reinforcing member 13b that reinforces the hook portion 13a.

  A cylinder abutting portion 14 protrudes from the abdominal surface 6a of the front boom 6 in the vicinity of the lifting hook 13. Specifically, a bracket 14a having a hat-shaped cross section is provided on the abdominal surface 6a of the front boom 6 so as to protrude toward the jib cylinder 12 side. A rubber cylindrical buffer member 14b is attached to the end of the bracket 14a. In the vicinity of the cylinder contact portion 14, there are a cylinder side pipe 15 (not shown in FIGS. 1 to 9 for simplification) directed to the tube 12 a of the jib cylinder 12, and a main pipe 16 extending from the main boom 4 to the jib cylinder 12 side. The connection part 17 which connects is attached. The main pipe 16 also extends to the arm 7 side and the arm cylinder 8. When the jib cylinder 12 is secured, the upper surface of the tube 12 a of the jib cylinder 12, specifically, the maximum diameter portion on the head side is brought into contact with the buffer member 14 b of the cylinder abutting portion 14.

-Dismantling method of construction machine 1-
Next, a method for disassembling the construction machine 1 according to the present embodiment will be described.

  First, as shown in FIG. 1, the tip attachment is removed, and the tip of the arm 7 is grounded to the ground.

  Next, as shown in FIG. 2, a nylon sling 21 as a hanging tool hung on a hook 20 of a crane (not shown) is hung on the tube 12a of the jib cylinder 12, and is lifted and held.

  Next, as shown in FIG. 3, the rod pin 12 c that connects the rod 12 b of the jib cylinder 12 and the main boom 4 is extracted.

  Next, as shown in FIG. 4, the jib cylinder 12 is contracted. As shown also in FIG. 10, the tube 12 a side of the jib cylinder 12 is on the front boom 6 side, and the cylinder side pipe 15 extends along the abdominal surface 6 a of the front boom 6 and is connected to the jib cylinder 12. For this reason, even if the cylinder side pipe 15 is not extended, if the rod pin 12c on the main boom 4 side is removed, the jib cylinder 12 can be contracted. Further, since the tube 12a side that hardly moves during the reduction operation is hung, the hanging work is safe and simple.

  Next, as shown in FIG. 5, the tube of the jib cylinder 12 is brought into contact with the buffer member 14b of the cylinder contact portion 14 that is lifted from the abdominal surface 6a of the front boom 6 by lifting the jib cylinder 12 with a crane. The chain block 22 is tightened on the hook 13 and the jib cylinder 12 is secured to the front boom 6. By bringing the jib cylinder 12 into contact with the cylinder contact portion 14, a gap is secured between the tube 12a and the abdomen surface 6a of the front boom 6. Therefore, the cylinder side pipe 15 and the connection part 17 on the abdomen surface 6a are overtightened. Will not be damaged. Further, it is not necessary to cure the front boom 6 to prevent scratches, and the jib cylinder 12 is securely and easily secured to the front boom 6.

  Next, as shown in FIG. 6, the main pipe 16 extending from the main boom 4 is removed.

  Next, as shown in FIG. 7, the arm 7 and the front boom 6 to which the jib cylinder 12 is secured are lifted, and the front boom foot pin 6 c that connects the front boom 6 and the main boom 4 is extracted.

  Next, as shown in FIG. 8, the arm 7 and the front boom 6 to which the jib cylinder 12 is secured are separated from the main boom 4.

  Next, as shown in FIG. 9, the arm 7 and the front boom 6 to which the jib cylinder 12 is secured are placed on the installation table 23 so that the jib cylinder 12 does not contact the ground.

-Effect of the embodiment-
Therefore, according to the construction machine 1 according to this embodiment, the tube 12a side is connected to the front boom 6 and the rod 12b side is connected to the main boom 4 so that the jib cylinder 12 is disassembled. Since it is possible to hang the tube 12a that hardly moves during the reduction operation without performing extension, it is possible to work quickly, and further, the jib cylinder 12, the front boom 6, and the arm 7 can be removed integrally. Work man-hours are greatly reduced. In addition, it is not necessary to change the boom size significantly, and assembly / disassembly can be greatly improved while maintaining the performance.

  According to the above-described embodiment, the cylinder-side piping on the belly surface 6a of the front boom 6 is obtained by bringing the jib cylinder 12 into contact with the cylinder abutting portion 14 projecting from the belly surface 6a of the front boom 6 and securing it. Since the jib cylinder 12 can be securely and easily secured to the front boom 6 while preventing damage to the connector 15 and the connecting portion 17, assembly / disassembly can be greatly improved.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  In the above embodiment, the jib cylinder 12 is lifted by a crane. However, as shown in FIG. 13, the chain block 22 as a lashing member is hung on the lifting hook 13 provided on the abdominal surface 6 a side of the front boom 6, and the jib cylinder 12 is hung. It may be lifted. By doing in this way, the jib cylinder 12 can be lifted and secured without using a crane. For this reason, assembly / disassembly can be improved significantly.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

It is the side view which removed the tip attachment of the construction machine concerning the embodiment of the present invention, and grounded the tip of the arm to the ground. FIG. 2 is a view corresponding to FIG. 1 illustrating a state in which the jib cylinder is lifted and held. FIG. 2 is a view corresponding to FIG. 1 illustrating a state where a rod pin is removed. FIG. 2 is a view corresponding to FIG. FIG. 2 is a view corresponding to FIG. 1 showing a state in which the jib cylinder is secured to the front boom belly surface. FIG. 2 is a view corresponding to FIG. 1 illustrating a state in which a pipe extending from the main boom to the front boom is removed. FIG. 2 is a view corresponding to FIG. 1 illustrating a state in which a foot pin of a front boom is extracted. FIG. 2 is a view corresponding to FIG. 1 illustrating a state where an arm and a front boom are separated from a main boom. FIG. 2 is a view corresponding to FIG. 1 showing a state where an arm and a front boom are placed on an installation base. It is a side view which shows a front boom and its surrounding piping. It is a perspective view which expands and shows a lifting hook and a cylinder contact part. It is an arrow view seen from the XII direction of FIG. It is the FIG. 2 equivalent view of the construction machine concerning other embodiment. It is a side view showing process (1) concerning the 1st conventional dismantling method. It is a side view showing process (2) concerning the 1st conventional dismantling method. It is a side view showing process (3) concerning the 1st conventional dismantling method. It is a side view showing process (4) concerning the 1st conventional dismantling method. It is a side view showing process (5) concerning the 1st conventional dismantling method. It is a side view showing process (6) concerning the 1st conventional dismantling method. It is a side view showing process (7) concerning the 1st conventional dismantling method. It is a side view showing process (8) concerning the 1st conventional dismantling method. It is a side view showing process (9) concerning the 1st conventional dismantling method. It is an expanded side view which shows process (3) 'and (4)' concerning the 2nd conventional dismantling method. It is an enlarged side view which shows process (5) 'concerning the 2nd conventional dismantling method.

Explanation of symbols

1 construction machine 3 upper swing body (construction machine body)
4 Main boom 6 Front boom 7 Arm 12 Jib cylinder 12a Tube 12b Rod 13 Lifting hook 14 Cylinder contact part 15 Piping 16 Piping 21 Nylon sling
22 Chain block

Claims (4)

The construction machine body,
A main boom connected to the main body of the construction machine in a undulating manner;
A front boom pivotably connected to the main boom;
A jib cylinder that rotates the front boom by extending and contracting;
An arm rotatably connected to the front boom;
A construction machine comprising a tip attachment attached to the tip of the arm,
The jib cylinder has a tube side connected to the front boom and a rod side connected to the main boom .
A construction machine characterized in that a cylinder abutting portion for projecting a tube of the jib cylinder when the jib cylinder is secured is projected on the belly surface of the front boom . The construction machine according to claim 1,
A construction machine, wherein the front boom is provided with a lifting hook for lifting the jib cylinder. The construction machine body,
A main boom connected to the main body of the construction machine in a undulating manner;
A front boom pivotably connected to the main boom;
A jib cylinder that rotates the front boom by extending and contracting;
An arm rotatably connected to the front boom;
A method for disassembling a construction machine comprising a tip attachment attached to the tip of the arm,
Remove the tip attachment and ground the tip of the arm to the ground.
Lift and hold the jib cylinder with a lifting tool,
Remove the rod pin that connects the rod of the jib cylinder and the main boom,
Reduce the jib cylinder,
Hang a securing member on the lifting hook provided on the front boom,
By lifting the above Jibushirinda was lashed to the front boom in the lashing member,
Remove the pipe that extends from the main boom to the front boom,
Lift the arm and the front boom to which the jib cylinder is secured,
Pull out the front boom foot pin that connects the front boom and the main boom,
A disassembling method for a construction machine, wherein the arm and the front boom to which the jib cylinder is secured are separated from a main boom and placed on an installation base. In the dismantling method of the construction machine of Claim 3 ,
A disassembling method for a construction machine, wherein the jib cylinder is brought into contact with a cylinder abutting portion projecting from the front surface of the front boom, and the jib cylinder is secured to the front boom with a securing member.

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