JP2007284221A - Jib mounting and dismounting device for mobile crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jib mounting and dismounting device for a mobile crane capable of preventing a wire from being damaged due to pulling-out of the wire caused by extension and contraction operation of a jib derricking cylinder. <P>SOLUTION: When a jib support 62 is rotated so as to let a jib terminal upper part connection part 4 approach a boom tip upper part connection part 3 centered on a jib terminal lower part connection part 2 by extending or contracting the jib derricking cylinder 63 while a tip of a jib main body comes into contact with the ground, extension and contraction operation of the jib derricking cylinder 63 is regulated when amount of payed out wire detected by a wire paying-out amount detection means 17 provided in a winch exceeds predetermined amount before the jib derricking cylinder 63 is extended or contracted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a device for attaching and detaching a jib attached to the tip of a telescopic boom of a mobile crane such as an all-terrain crane.

  2. Description of the Related Art Conventionally, a jib attachment / detachment device for attaching a jib to a telescopic boom distal end by pulling up the jib base end to the telescopic boom distal end using a winch device of a mobile crane to which the jib is mounted is known (for example, a patent Reference 1). However, since the jib attachment / detachment device described in Patent Literature 1 connects the tip of the jib wire to the base end of the jib and pulls up the base end of the jib, the jib wire is attached after the jib is attached to the tip of the telescopic boom. It was dangerous to remove the tip from the base end of the jib.

  Therefore, the applicant does not need to remove the jib wire tip from the jib base end after attaching the jib to the telescopic boom tip, and it is not necessary to carry the jib wire tip to the jib tip. Proposed an excellent jib attachment / detachment device (see Patent Document 2).

FIG. 5 shows a jib attachment / detachment device described in Patent Document 2. As shown in FIG. The jib attachment / detachment device described in Patent Document 2 includes a jib attachment / detachment sheave 55 that is installed at the upper end of the telescopic boom and can be freely extended, and an intermediate wire lock that is installed at the upper end of the jib and is capable of engaging and disengaging the middle jib wire And a wire tip locking portion 69 that is installed at the tip of the jib and can freely engage and disengage the tip of the jib wire. Then, the jib 60 is attached to the tip of the telescopic boom in the following procedure.
(1) Temporarily place the jib 60 on the ground so that the telescopic boom 50 and the jib 60 in a lying state are on the same line in plan view and the base end of the jib is located below the distal end of the telescopic boom. (2) A jib wire 45 fed from a jib winch provided in a swivel (not shown) is hung around the jib attachment / detachment sheave 55 and then suspended from the tip of the telescopic boom. (3) The jib wire intermediate portion is engaged with the wire intermediate engagement portion 67 at the jib base end portion, and the jib wire distal end portion is engaged with the wire tip engagement portion 69 at the jib distal end. (4) After raising the jib winch to raise the jib base end to the telescopic boom tip, the jib base end is connected to the telescopic boom tip by the boom jib connecting means.
JP-A-2-182695 (page 3-5, FIG. 1) Japanese Patent Application No. 2005-166844 (pages 3-5, 4-6)

  However, the jib 60 shown in FIG. 5 includes a jib support 62 that can be attached to and detached from the tip of the boom, a jib main body 61 whose base end is pivotally attached to the tip of the jib support 62, and appropriate positions of the jib support 62 and the jib main body 61. A jib hoisting cylinder 63 having both ends axially mounted therebetween is provided. Such a jib has the following problems. That is, in this type of jib, as shown in FIG. 6, first, the lower connecting pin 76 at the lower end of the telescopic boom 50 (in this example, the lower end of the jib mounting bracket 52) and the jib support 62 at the lower end of the base end of the jib. The lower connecting piece 74 is connected. Next, by reducing the jib hoisting cylinder 63 while the tip of the jib 60 is placed on the ground, the jib side upper connecting piece 72 is moved closer to the boom side upper connecting piece 73 (upper end of the jib mounting bracket 52). It was necessary to rotate the support 62 around the lower connecting pin 76.

  However, since the jib wire 45 is supported by the jib base end guide sheave 68 above the pivot shaft between the jib support 62 and the jib body 61, the jib wire is pulled by the above operation. Therefore, when the jib hoisting cylinder 63 is contracted and the winch is operated to feed out the jib wire 45 or when it has not been fed out in advance, the jib wire 45 is broken or the jib attaching / detaching sheave 55 is damaged. There was a fear. Therefore, the present invention intends to provide a jib attachment / detachment device for a mobile crane that does not cause damage to wires or the like even if the jib is of the type shown in FIG.

  The jib attachment / detachment device for a mobile crane according to claim 1 of the present application has a swivel mounted on a traveling vehicle body so that the swivel can be swung freely. Intended for mobile cranes with possible jib. The jib has a jib support that can be attached to and detached from the boom tip, a jib body whose base is pivotally attached to the tip of the jib support, and both ends of the jib that are pivoted between appropriate positions of the jib support and the jib body. A jib hoisting cylinder, and the jib body moves up and down with respect to the jib support by expansion and contraction of the jib hoisting cylinder.

  The jib attachment / detachment device includes a boom tip lower part connecting portion at the lower end of the telescopic boom, and a jib base end lower connecting portion at the base end lower part of the jib support. The lower part of the support base end can be connected, and the upper end of the telescopic boom is provided with an upper connecting part of the boom tip, and the upper part of the base of the jib support is provided with an upper connecting part of the jib base end. The upper end of the boom and the upper end of the jib support can be connected.

  When installing the jib, temporarily place the jib on the ground so that the telescopic boom and jib in the lying state are in the same line in plan view and the base end of the jib support is located below the tip of the telescopic boom, A wire fed from a winch arranged on a swivel is hung on a jib attaching / detaching sheave arranged to protrude upward, and the wire intermediate part is engaged with a wire intermediate locking part arranged on the upper end of the jib support. After the wire tip is locked to the tip of the jib body, the jib support is pulled up to the tip of the telescopic boom while the tip of the jib body is grounded by winding the winch. By connecting the connecting part and the jib base end lower connecting part, and then extending and retracting the jib hoisting cylinder with the tip of the jib body grounded When the jib support is rotated so that the jib base end upper connection part approaches the boom tip upper connection part around the jib base end lower connection part, it is provided on the winch before the expansion and contraction operation of the jib hoisting cylinder. When the wire feed amount from the wire feed amount detection means is not detected more than a predetermined amount, the expansion / contraction operation of the jib undulation cylinder is restricted.

  In the jib attachment / detachment device for a mobile crane according to the first aspect of the present invention, the wire feed amount from the wire feed amount detection means provided on the winch is equal to or greater than a predetermined amount before the expansion / contraction operation of the jib hoisting cylinder. When it is not detected, the expansion / contraction operation of the jib undulation cylinder is restricted, so that it is possible to reliably prevent damage to the wire or the like due to the wire tension generated with the expansion / contraction operation of the jib undulation cylinder.

  FIG. 1 shows a jib attachment / detachment device for a mobile crane according to an embodiment of the present invention. Portions common to the jib attachment / detachment device described in Patent Document 2 shown in FIGS. 5 and 6 are given the same reference numerals, and descriptions thereof are omitted. Reference numeral 52 denotes a jib attachment bracket attached to the distal end of the telescopic boom 50. In the present embodiment, the jib attachment bracket 52 is used, but it is not an essential configuration of the present invention. Of course, the jib 60 may be directly attached to the tip of the telescopic boom 50.

  Reference numeral 1 denotes a boom tip lower portion connecting portion at the lower end of the jib attachment bracket tip (lower end of the telescopic boom tip), and reference numeral 2 denotes a jib base end lower portion connecting portion at the lower end of the jib support. The telescopic boom tip lower part and the jib support base end lower part can be connected by the interaction between the boom tip lower part connecting part 1 and the jib base end lower connecting part 2. Reference numeral 3 denotes a boom tip upper connection part at the upper end of the jib mounting bracket (upper end of the telescopic boom), and reference numeral 4 denotes a jib base end upper connection part at the base end of the jib support. The telescopic boom tip upper part and the jib support base end upper part can be connected by the interaction between the boom tip upper part connecting part 3 and the jib base end upper connecting part 4.

  In FIG. 1, when the jib is mounted, the jib 60 is temporarily placed on the ground so that the telescopic boom 50 and the jib 60 in the lying state are on the same line in plan view and the base end of the jib support is located below the distal end of the telescopic boom. Yes. A wire 45 fed from a winch disposed on a swivel (not shown) is hung on a sheave 55 for attaching / detaching a jib that is disposed so as to protrude from the upper end of the telescopic boom. Further, after the wire 45 is locked at the intermediate portion of the wire intermediate locking portion 67 disposed at the upper end of the jib support, the wire 45 is engaged with the wire tip locking portion 69 at the tip of the jib body. It has stopped. Reference numeral 5 denotes a remote control device for attaching / detaching a jib, which is provided on the jib support 62 and can perform remote control operations necessary for attaching / detaching the jib.

  FIG. 2 is a block diagram of a portion related to the present invention of the control device of the jib attachment / detachment device. The remote control device 5 for attaching / detaching the jib includes a winch operating means 6, a jib hoisting cylinder operating means 7, and a connecting part operating means 8. Signals from the respective operating means of the jib attachment / detachment remote control device 5 are sent to the controller 9. Reference numeral 10 denotes an in-cab operation device installed in the cab of the mobile crane. The in-cab operating device 10 is also provided with a winch operating means 6, a jib hoisting cylinder operating means 7, and a connecting portion operating means 8, similarly to the jib attaching / detaching remote control device 5. Then, signals from the respective operating means are sent to the controller 9.

  The controller 9 is mounted on a swivel of a mobile crane (not shown), receives a signal from the jib attachment / detachment remote control device 5 or the in-cab operation device 10, and outputs a drive signal based on predetermined control to the winch of the winch device 14. It sends out to the drive means 15 and the jib hoisting cylinder drive means 16. As the winch driving means 15 and the jib hoisting cylinder driving means 16, known electric / hydraulic driving means are employed. Reference numeral 17 denotes a wire feed amount detection means provided in the winch device 14. The wire feed amount detection means 17 detects the length of the wire fed from the winch device 14, and specifically detects the rotation speed of the winch drum or the hydraulic motor that drives the winch drum and feeds it from the rotation speed. The wire length is calculated. The wire feed amount detected by the wire feed amount detection means 17 is sent to the controller 9 and used for controlling the jib attachment / detachment device. Reference numeral 18 denotes a connecting portion driving means, and each connecting portion of the boom tip lower connecting portion 1, the jib base end lower connecting portion 2, the boom tip upper connecting portion 3 and the jib base end upper connecting portion 4 according to a drive signal from the controller 9. Is to drive.

  The effect | action of the jib attachment / detachment apparatus mentioned above is demonstrated below. FIG. 3 is a flowchart for explaining the control contents of the part related to the operation of the present invention. Hereinafter, although the case where a jib is mounted using the remote controller 5 for attaching / detaching the jib will be described, the jib can be mounted in the same manner even if the operating device 10 in the cab is used.

  In the state shown in FIG. 1, a winch winding operation is performed by the winch operating means 6 of the remote controller 5 for attaching / detaching the jib (S1 in the flowchart of FIG. 3). Then, the jib support 62 of the jib 60 is pulled upward by the wire 45. At that time, the jib main body 61 is supported on the ground by the tip support portion 20 that is disposed at the tip of the jib main body and rotatably supports the tip portion on the ground by wheels. The boom tip lower connecting portion 1 and the jib base end lower connecting portion 2 are engaged and connected (S2 in the flowchart of FIG. 3).

  FIG. 4 shows a state where the boom tip lower end connecting portion 1 and the jib base end lower connecting portion 2 are connected. At this time, since the wire 45 has just pulled up the jib base end portion, it is in a tension state in which tension is generated by its weight. In this state, the operator 21 operates the jib attachment / detachment remote control device 5 to reduce the jib hoisting cylinder (dibutyl cylinder) 63, thereby reducing the jib base end lower connection portion 2 as a center. When the jib support 62 rotates so that 4 approaches the boom tip upper coupling portion, the wire 45 is further pulled, and the wire 45 is broken.

  However, as shown in the flowchart of FIG. 3, when the jib undulation operation is performed (S4), the controller 9 determines whether the wire feed amount is 160 mm or more based on the detection signal from the wire feed amount detection means 17. (S5). If the winch unwinding operation is not performed at all, or the winch unwinding operation is performed (S3), if the wire feed amount is not 160 mm, the jib undulation lowering operation is restricted. Note that the wire feed amount of 160 mm is the minimum feed amount at which the wire 45 is not pulled with sufficient margin. On the other hand, before the jib raising / lowering operation, the winding is driven by the winch lowering operation. When the wire feed amount is 160 mm or more, the jib raising / lowering driving is performed (S6), and the jib raising / lowering cylinder 63 is contracted. Thereby, the jib support 62 rotates around the jib base end connection part 2 so that the jib base end upper connection part 4 approaches the boom front end upper connection part 3 while the front end support part 20 at the front end of the jib body 61 is grounded. . Then, after the jib base end upper connecting portion 4 and the boom tip upper connecting portion 3 are engaged, an upper connecting portion connecting operation is performed, and a connecting pin (not shown) is driven for connection (S7).

  As described above, when the wire feed amount from the wire feed amount detection means 17 provided on the winch is not detected more than a predetermined amount before the jib undulation cylinder 63 is expanded and contracted, the jib undulation cylinder 63 is expanded and contracted. As a result, the wire and the like can be reliably prevented from being damaged. In order to remove the mounted jib 60 from the telescopic boom 50, an operation that is the reverse of the above-described attachment operation is performed. At that time, after releasing the connection between the jib base end upper connecting portion 4 and the boom tip upper connecting portion 3, the jib hoisting cylinder 63 is extended while the tip support portion 20 of the jib main body 61 is grounded to thereby extend the jib base. The jib support 62 is rotated to the center of the jib base end lower connecting part 2 so that the end upper connecting part 4 is separated from the boom tip upper connecting part 3, but the wire 45 is loosened by its operation, Regulation is unnecessary.

It is a jib attachment / detachment device for a mobile crane according to an embodiment of the present invention. The block diagram of the part relevant to this invention of the control apparatus of a jib attachment / detachment apparatus is shown. It is the flowchart explaining the control content of the part relevant to the effect | action of this invention. The state when the boom front end lower connecting portion 1 and the jib base end lower connecting portion 2 are connected is shown. The jib attachment / detachment device described in Patent Document 2 is shown. A state is shown in which the lower connecting pin 76 at the lower end of the telescopic boom 50 and the jib-side lower connecting piece 74 at the lower end of the jib support 62 are connected.

Explanation of symbols

1: Boom front end lower connection part 2: Jib base end lower connection part 3: Boom front end upper connection part 4: Jib base end upper connection part 17: Wire feed amount detection means 45: Wire (wire for jib)
50: Telescopic boom 55: Jib attachment / detachment sheave 60: Jib 61: Jib body 62: Jib support 63: Jib hoisting cylinder (dibutyl cylinder)
67: Wire intermediate locking part

Claims (1)

A mobile crane jib attaching / detaching device having a swivel mounted on a traveling vehicle body, a telescopic boom pivoted on the swivel base, and a jib detachably attached to a tip of the telescopic boom,
The jib includes a jib support that can be attached to and detached from the boom tip, a jib body that is pivotally mounted at the base of the jib support, and a jib undulation that is pivoted at both ends between the jib support and the jib body. And a jib body that moves up and down with respect to the jib support by expansion and contraction of the jib undulation cylinder.
The telescopic boom tip lower part has a boom tip lower part connecting part, and the jib support base part lower part has a jib base end lower part connecting part, and the telescopic boom tip lower part and jib support base end lower part can be connected by the interaction of both the connecting parts. Furthermore, the telescopic boom tip upper part is provided with a boom tip upper part connecting part, and the jib support base part upper part is provided with a jib base end upper part connecting part, and the telescopic boom tip upper part and the jib support base end are obtained by the interaction of the two connecting parts. The upper part can be connected,
When installing the jib, temporarily place the jib on the ground so that the telescopic boom and jib in the lying state are in the same line in plan view and the base end of the jib support is located below the tip of the telescopic boom, A wire fed from a winch arranged on a swivel is hung on a jib attaching / detaching sheave arranged to protrude upward, and the wire intermediate part is engaged with a wire intermediate locking part arranged on the upper end of the jib support. After the wire tip is locked to the tip of the jib body, the jib support is pulled up to the tip of the telescopic boom while the tip of the jib body is grounded by winding the winch. By connecting the connecting part and the jib base end lower connecting part, and then extending and retracting the jib hoisting cylinder with the tip of the jib body grounded When the jib support is rotated so that the jib base end upper connection part approaches the boom tip upper connection part around the jib base end lower connection part, it is provided on the winch before the expansion and contraction operation of the jib hoisting cylinder. A jib attachment / detachment device for a mobile crane, wherein when the wire feed amount from the wire feed amount detection means is not detected more than a predetermined amount, the expansion / contraction operation of the jib hoisting cylinder is restricted.

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