JP4809939B2 - Jib attachment and detachment device for telescopic boom tip of mobile crane - Google Patents

Description

  The present invention relates to a jib attachment / detachment device for a telescopic boom tip that can be used for a mobile crane such as an alternator crane.

  In the case of a jib that is mounted on a transport vehicle such as a truck, the jib is lifted at the work site and attached to the tip of the telescopic boom of the mobile crane. At that time, a device has been proposed in which a jib is lifted to the tip of a telescopic boom using a lifting device of a mobile crane on which the jib is mounted and mounted on the telescopic boom (for example, see Patent Document 1).

  FIG. 9 shows a jib attachment / detachment device described in Patent Document 1. A jib 6 is placed on the front ground of the telescopic boom 4 in a lying state. A jib wire 10 from a jib winch (not shown) is hung around a sheave 12 at the distal end of an arm 38 projecting above the distal end of the telescopic boom, and then suspended below the distal end of the telescopic boom. It is connected to the arm 37. When the winch is wound up, the base end of the jib 6 is pulled up to the position (A), and when the winch is further wound up, the base end of the jib 6 is pulled up to the position (B). Then, the jib 6 can be attached to the tip of the telescopic boom 4 by connecting the upper connecting portion 39 and the lower connecting portion 40.

According to the jib attachment / detachment device described in Patent Document 1, there is an advantage that it is not necessary to prepare another crane for lifting the jib. Further, since the jib winch and its wire provided in the mobile crane are used, there is an advantage that a dedicated mechanism for lifting the jib is not required. Other devices for attaching / detaching a jib to / from a telescopic boom using a jib winch and a jib wire of a mobile crane have been proposed (see, for example, Patent Document 2).
Japanese Patent No. 2767598 (page 4-5, Fig. 1) Japanese Patent No. 3009375 (page 2-3, FIG. 2)

  However, since the conventional jib attachment / detachment device as described above connects the tip of the jib wire to the base end of the jib, after the jib is attached to the tip of the telescopic boom, the tip of the jib wire is connected from the base end of the jib. Removal work was necessary. Since the vicinity of the tip of the boom is at a relatively high position and the scaffold for working is likely to be unstable, improvement has been desired from the viewpoint of safety. Further, since the wire tip connection and release operations are time-consuming operations, improvement has been desired from the viewpoint of work man-hours.

  In addition, it is necessary for the worker to carry the tip of the jib wire to the tip of the jib, hang it around the tip of the jib tip, and hang the tip of the wire from the tip of the jib. Since the upper surface of the jib is not only high in height but also narrow and difficult to walk, it has been desired to improve this work in terms of safety and manpower.

  Therefore, the present invention does not require removal of the jib wire tip from the jib base end, and it is not necessary to carry the jib wire tip to the jib tip, so that a jib attachment / detachment device excellent in safety and man-hours will be provided. It is what.

A device for attaching and detaching a jib to a telescopic boom tip of a mobile crane according to claim 1 of the present application includes a jib winch on which a jib wire can be unwound and retracted on a swivel base, and a jib is attached to the tip of the telescopic boom by means of connecting means between boom jibs. This is a device for attaching and detaching a jib to the tip of a telescopic boom of a mobile crane that can be connected to the upper end of the telescopic boom. A detachable wire intermediate locking part; and a wire tip locking part installed at the tip of the jib and detachable from the tip of the jib wire, and the jib wire fed out from the jib winch, mobile crane, characterized in that not hung after wound around the jib throw-sheave overhanging, by lapse of the wire intermediate locking portion for locking the jib wire tip wire tip engaging portion Jib attachment apparatus to the telescopic boom tip of the emissions.

Moreover, the jib attachment / detachment device for the telescopic boom tip of the mobile crane described in claim 2 of the present application is such that the wire intermediate locking portion described in claim 1 has a circular arc directed downward and on the jib center line. An arcuate wire locking member is provided, and the arcuate wire locking member is formed with a groove into which a jib wire can be fitted, and the jib wire intermediate portion is connected to the wire intermediate locking portion. The arcuate wire locking member can be engaged and disengaged from the side.

  The jib attachment / detachment device according to claim 1 is configured such that the jib wire intermediate portion is engaged with the wire intermediate engagement portion installed at the upper portion of the jib base end, and further, the jib wire distal end portion is engaged with the wire tip engagement portion of the jib distal end. The jib winch is rolled up to the tip of the telescopic boom by winding up the jib winch while being locked to the part, and then the jib wire intermediate part is removed from the wire intermediate locking part. Therefore, the operation | work which removes the jib wire front-end | tip part from the jib base end part conventionally required becomes unnecessary.

The jib attachment / detachment device according to claim 2 includes an arc-shaped wire locking member that is positioned on the jib center line with the arc of the wire intermediate locking portion facing downward, and the arc-shaped wire locking member includes a jib. Since the groove into which the wire for fitting is formed is formed, even if tension is generated in the wire when the jib base end is lifted, the wire is locked along the arcuate wire locking member. As a result, there is no risk of excessive deformation of the wire.

  Furthermore, since the said wire intermediate | middle latching | locking part comprised the said jib wire intermediate | middle part so that engagement / disengagement to the said circular-arc-shaped wire latching member from the side of the said wire intermediate | middle latching part was connected, the jib was connected with the boom front-end | tip. Later, the jib wire intermediate portion can be easily removed from the wire intermediate locking portion.

  In FIG. 1, the jib attachment / detachment apparatus to the telescopic boom front-end | tip of the mobile crane which concerns on embodiment of this invention is shown. Reference numeral 52 denotes a jib mounting bracket attached to the front of the boom head 58 of the top boom 51 located at the foremost end of the telescopic boom 50. The jib attachment bracket 52 is firmly attached to the boom head 55 by the upper attachment means 53 and the lower attachment means 54. Both the upper mounting means 53 and the lower mounting means 54 are configured such that a plate having pin holes projects from the boom head 58 side and the jib mounting bracket 52 side, and the pin holes of both plates are overlapped. The mounting pin is inserted.

  Reference numeral 55 denotes a jib attachment / detachment sheave installed at the upper end of the tip of the jib attachment bracket 52. The jib attaching / detaching sheave 55 can be fixed overhanging in front of the tip of the jib attaching bracket 52. Reference numeral 56 denotes a sheave bracket that rotatably supports the jib attaching / detaching sheave 55 at its distal end, and its base end is pivotally attached to the upper end of the jib mounting bracket 52 by a pin 57.

  In this embodiment, the case where the jib mounting bracket 52 is used at the distal end of the telescopic boom will be described. However, the jib mounting bracket 52 is not an essential configuration in the jib attachment / detachment device of the present invention. That is, the above-described jib attaching / detaching sheave 55 may be directly installed on the boom head 58 of the top boom 51. In that case, since the jib attachment bracket 52 is not required, the overall configuration of the jib attachment / detachment device can be simplified.

  Reference numeral 45 denotes a jib wire fed from a jib winch (not shown) provided on a swivel to which the telescopic boom 50 is pivotably mounted. The jib wire 45 is suspended below the tip of the jib mounting bracket 52 via the upper end of the jib mounting bracket 52 described above. Reference numeral 46 denotes a rope end of the tip of the jib wire.

  Reference numeral 60 denotes a jib that can be connected to the distal end of the telescopic boom 50. The jib 60 includes a jib body 61, a jib support 62, and a tilt cylinder 63, and the base end portion of the jib body 61 is pivotably attached to the upper end of the jib support 62, and the tilt cylinder 63 includes a lower portion of the jib support 62. The jib body 61 is pivotally connected between the lower surfaces. The jib 60 is configured such that the jib body 61 tilts with respect to the jib support 62 by the expansion and contraction of the tilt cylinder 63. The jib main body 61 is a multistage telescopic type, and a second jib 65 and a top jib 66 are fitted into a base jib 64 so as to be telescopic. The jib body 61 is extended and contracted by a built-in extension mechanism (not shown).

  Reference numeral 67 denotes a wire intermediate locking portion disposed at the upper base end of the jib support 62. Reference numeral 68 denotes a jib base end guide sheave disposed at the upper end of the jib support 62. Reference numeral 69 denotes a wire tip locking portion disposed on the top surface of the base jib tip. The wire tip locking portion 69 is provided with a rope end attachment hole so that the above-described cable tip 46 at the tip of the jib wire can be locked. Reference numeral 70 denotes a jib front end upper guide sheave provided at the upper end of the top jib 66, and reference numeral 71 denotes a jib front lower guide sheave provided at the lower end of the top jib 66.

  The configuration of the boom jib connecting means is as follows. Reference numeral 72 denotes a jib-side upper connecting piece that protrudes rearward from the upper part of the jib support 62, and is provided with a connecting pin hole. Reference numeral 73 denotes a boom-side upper connecting piece projecting forward from the upper part of the jib mounting bracket 52, and is provided with a connecting pin hole. A connecting pin is inserted in a state where the jib side upper connecting piece 72 and the boom side upper connecting piece 73 are overlapped, and both are connected. Reference numeral 74 denotes a jib-side lower connecting piece that is arranged to protrude rearward from the lower part of the jib support 62, and is formed by opening a connecting pin engaging portion 75 upward. Reference numeral 76 denotes a lower connecting pin that protrudes toward the side of the lower end of the tip of the jib mounting bracket 52. The connecting pin engaging portion 75 of the jib-side lower connecting piece 74 is engaged with the lower connecting pin 76 so that both are connected.

  FIG. 2 is a detailed view of the jib support 62 shown in FIG. 3 is a cross-sectional view taken along arrow B in FIG. The wire intermediate locking portion 67 disposed on the upper surface of the rear portion of the jib support 62 includes an arcuate wire locking member 77 whose arc is directed downward and located on the jib center line. The arc-shaped wire locking member 77 is formed with a groove 78 into which the jib wire 45 can be fitted. Reference numeral 79 denotes a support erected on the upper surface of the rear portion of the jib support 62. The support 79 has a surface 80 parallel to the jib center line, and the arcuate wire locking member 77 is attached to the surface 80. Since the wire intermediate locking portion 67 is configured as described above, the jib wire intermediate portion can be connected to the wire intermediate engagement portion even when the cable end 46 at the tip of the jib wire is locked to the wire tip locking portion 69 at the jib tip. The arcuate wire locking member 77 can be engaged and disengaged from the side of the stopper 67.

  The jib base end guide sheave 68 installed at the upper front of the jib support 62 is arranged so that the sheave groove 81 is positioned on the jib center line as shown in FIG. Accordingly, the jib wire 45 can be hung on the jib proximal end guide sheave 68 at the same time as the jib wire 45 is hung on the wire intermediate locking portion 67.

  The procedure for connecting the jib 60 using the above-described jib mounting device of the present invention to the tip of the telescopic boom 50 is as follows. As shown in FIG. 1, the jib 60 is placed on the ground so as to be coaxial with the telescopic boom 50 in a lying state in plan view and so that the base end of the jib is positioned below the distal end of the telescopic boom. The jib attachment / detachment sheave 55 is pulled up and fixed by a fixing means (not shown) at a position in front of the jib attachment bracket 52.

  As shown in FIG. 4, a jib wire 45 fed out from a jib winch (not shown) provided on the swivel base is hung from the tip of the telescopic boom after being hung around the jib attaching / detaching sheave 55. . As shown in FIG. 4, the jib wire intermediate portion is engaged with the wire intermediate engagement portion 67 at the jib proximal end portion, hung around the jib proximal end guide sheave 68, and the rope end 46 at the distal end portion of the jib wire. Lock to the wire tip locking portion 69 at the tip of the base jib.

  As shown in FIG. 5, the jib winch is wound up to raise the jib base end (jib support 62) toward the telescopic boom tip. At that time, the jib wire 45 is in a tension state, and the jib wire 45 acts on the wire intermediate locking portion 67 at the jib base end portion to pull up the jib base end portion. At this time, the tip of the jib remains in contact with the ground.

  When the jib wire 45 is further pulled up, the connecting pin engaging portion 75 formed on the jib side lower connecting piece 74 of the jib support 62 is engaged with the lower connecting pin 76 of the jib mounting bracket 52 as shown in FIG. Match. Next, when the tilt cylinder 63 is reduced, the tip of the jib 60 is drawn toward the tip of the telescopic boom while being in contact with the ground, the jib support 62 rotates around the lower connecting pin 76, and the jib side upper connecting piece 72 is attached to the jib. The bracket 52 approaches the boom-side upper connecting piece 73. After the jib-side upper connecting piece 72 and the boom-side upper connecting piece 73 are overlapped, both connecting pieces are connected by a connecting pin (not shown). Thus, the jib 60 can be connected to the distal end of the telescopic boom 50.

  As shown in FIG. 7, the jib winch is slightly fed out, the jib wire 45 is loosened, and then the corresponding intermediate portion of the jib wire is moved to the side of the wire intermediate locking portion 67, so that the wire intermediate locking is performed. The locking with the part 67 can be released. In this way, it is not necessary to remove the tip of the jib wire from the jib base end, which has been necessary after connecting the jib 60 to the tip of the telescopic boom, and the jib work wire 45 and the jib base end can be quickly and safely removed. Can be unlocked.

  FIG. 8 shows a state when the jib overhanging operation is completed. The following procedure is followed from the state shown in FIG. 7 to the state shown in FIG. First, the locking between the cable end 46 of the jib wire 45 and the wire tip locking portion 69 at the tip of the base jib is released. The jib wire 45 is wound around the jib tip upper guide sheave 70 and the jib tip lower guide sheave 71. The sub hook 81 is connected to the rope end 46 at the tip of the jib wire. At this time, since the tip of the jib is located near the ground, the above operation can be performed safely and easily. That is, since the work of carrying the tip of the jib wire 45 and transporting the top of the jib to the tip of the jib, which is necessary in the conventional jib attaching / detaching device, is unnecessary, the safety and the speed of the work are improved. When the tilt cylinder 63 is extended and the jib main body 61 is lifted with respect to the jib support 62, the jib work posture shown in FIG. 8 is obtained.

  The above is the procedure for attaching the jib 60 to the telescopic boom 50 using the jib attachment / detachment device of the present invention. In addition, the operation | work which removes the jib 60 from the telescopic boom 50 will perform the procedure mentioned above reversely.

It is a jib attachment / detachment apparatus to the boom front-end | tip of the mobile crane which concerns on invention of this application. FIG. 2 is a detailed view taken along arrow A in FIG. 1. FIG. 3 is a cross-sectional view taken along arrow B in FIG. 2. It is explanatory drawing of the procedure of a jib mounting | wearing operation | work. It is explanatory drawing of the procedure of a jib mounting | wearing operation | work. It is explanatory drawing of the procedure of a jib mounting | wearing operation | work. It is explanatory drawing of the procedure of a jib mounting | wearing operation | work. This is the jib work posture when the jib attachment work is completed. It is the jib attachment / detachment device described in Patent Document 1.

Explanation of symbols

45: Jib wire 50: Telescopic boom 55: Jib attachment / detachment sheave 60: Jib 67: Wire intermediate locking portion 69: Wire tip locking portion 77: Arc-shaped wire locking member 78: Groove 81: Jib hook

Claims (2)

A jib attachment / detachment device for a telescopic boom tip of a mobile crane , which has a jib winch that allows a jib wire to be unwound and retracted on a swivel, and can connect a jib to a telescopic boom tip by means of a boom jib connecting means ,
A jib attachment / detachment sheave that is installed at the top of the telescopic boom tip, can be freely extended, a wire middle locking part that is installed at the top of the jib base and can be freely engaged and disengaged, and a jib wire installed at the tip of the jib. A wire front end locking portion that can be freely engaged and disengaged, the wire extending from the jib winch is hung on a protruding sheave for attaching / detaching a jib and then suspended, and a wire intermediate locking portion The jib wire attaching / detaching device to the distal end of the telescopic boom of the mobile crane, wherein the tip of the jib wire is engaged with the wire distal end engaging portion after a lapse of time . The wire intermediate locking portion includes an arc-shaped wire locking member whose arc is directed downward and located on the jib center line, and a groove in which the jib wire can be fitted is formed in the arc-shaped wire locking member. are, the mobile crane according to claim 1, characterized in that the jib wire intermediate part was disengageably to the arcuate wire engagement member from the side of the wire intermediate locking portion Jib attachment / detachment device at the tip of the telescopic boom.

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