JP5408867B2 - Auxiliary jib for mobile crane - Google Patents

Description

  The present invention relates to an auxiliary jib used during a work of lifting and lowering a light suspended load at a high speed in a mobile crane or the like.

  The auxiliary jib of a conventional mobile crane was attached to the top boom so that it can be rotated between an extended position protruding forward from the tip of the top boom and a retracted position folded to one side of the top boom when used. . When the auxiliary jib is used, as described above, it is extended forward, the wire rope fed from the winch is hung, the hook block is fixed to the tip of the wire rope, and the crane work is performed.

  When the auxiliary jib is not used or running, remove the hook block from the wire rope, store the wire rope by winding the wire rope around the winch, and rotate and store the auxiliary jib in the storage position folded to one side of the top boom .

As described above, there is a method of attaching the boom head to the extended position so that it can be stored in the extended position when the auxiliary jib is used, and stored in the retracted position when the auxiliary jib is not used or traveling (see, for example, Patent Document 1).
Japanese Patent No. 2784718

  However, in Patent Document 1, the auxiliary jib rotates between the extended position of the top boom and the retracted position, and is attached to the retracted position when the auxiliary jib is not used, including during travel. It was heavy and disadvantageous. In recent years, the size of mobile cranes has increased, and as a result, auxiliary jibs have also increased in size, increasing their weight.

  Also, when attaching an attachment sheave that is attached to and detached from the side of the top boom when lifting heavy objects, the boom side support that is welded and fixed to one side of the top boom requires a longer foot pin to attach the bracket with the attachment sheave. It was.

  Therefore, the present invention is intended to provide an auxiliary jib that reduces the total vehicle weight during traveling by removing the auxiliary jib including the auxiliary jib or the boom side support when the auxiliary jib is not used or when traveling. When lifting heavy objects, a bracket with an attachment sheave is attached to the side of the top boom to increase the number of wire ropes between the top boom and the hook block. A foot pin is attached to the side of the top boom in order to attach a bracket provided with the attachment sheave (see FIG. 8). The left and right foot pins have the same protruding length from the side surface of the top boom, and can be mounted so as to surround a bracket having an attachment sheave at a symmetrical position. Accordingly, it is necessary to project the foot pin to the side by the dimension of the thickness of the boom side support and the dimension to prevent interference. Therefore, it is intended to provide an auxiliary jib that reduces the total weight of the vehicle by removing the boom side support, enabling the foot pin for attaching the bracket having the attachment sheave to the side surface of the top boom when lifting heavy objects.

In order to achieve the above object, an auxiliary jib for a mobile crane according to claim 1 includes a vehicle body, a swivel mounted pivotably on the vehicle body, and pivotally supported on the swivel base by a hoisting cylinder. A telescopic boom comprising a plurality of boom stages that are telescopically inserted, a boom side support attached to the top boom tip side of the topmost stage of the telescopic boom, and an auxiliary jib attached to the boom side support, The boom side support and the auxiliary jib are connected with a connecting pin so as to be rotatable. When the auxiliary jib is used, the boom side support and the auxiliary jib are extended to the front side of the top boom. stores, as well as the detached so the auxiliary jib from the boom side support by releasing the connection of the connecting pin when not in use, the top boom tip the boom side support Removably attached by detachable means to the surface, when not in use of the auxiliary jib is characterized by being configured so as to remove the boom side support from the top boom tip side.

Auxiliary jib mobile crane according to claim 2, Oite to claim 1, the foot pin projecting from the top boom side laterally bracket of the detachable with the attachment sheave provided, the boom-side support the foot pin It is characterized by being detachable while avoiding.

The auxiliary jib of the mobile crane according to claim 1 includes a vehicle body, a swivel mounted on the car body so as to be pivotable, and is pivotally supported on the swivel base by a hoisting cylinder and is telescopically fitted. A telescopic boom comprising a plurality of boom stages, a boom side support attached to the top boom tip side of the topmost stage of the telescopic boom, and an auxiliary jib attached to the boom side support. Is pivotally connected to the front side of the top boom when the auxiliary jib is used, and is stored around the side of the top boom by rotating around the connecting pin when stored. while the detached so the auxiliary jib to release the connecting pins from the boom side support, removably preparative detachable means the boom side support to the top boom tip side Only, since at the time of non-use of the auxiliary jib is configured as remove the boom side support from the top boom tip side, when using the auxiliary jib is carried crane work Te projecting on the front side of the top boom, when not in use auxiliary jib It can be rotated and stored on one side of the top boom, and can be stored easily. When traveling, the auxiliary jib can be removed to reduce the total weight of the vehicle.

Further, since the boom side support is configured to be removed from the side surface of the top boom tip when the auxiliary jib is not used, there is an effect that the total vehicle weight can be further reduced during traveling.

Auxiliary jib mobile crane according to claim 2, Oite to claim 1, the foot pin of the bracket of the detachable with attachment sheave top boom side provided, the boom-side support can be detached to avoid the foot pin As a result, it is not necessary to install a long foot pin with the dimension of the thickness of the boom side support and the dimension to prevent interference, and it is possible to shorten the foot pin and reduce the total weight of the vehicle There is.

  A first embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 4. FIG. The vehicle body 1 is provided with front and rear outriggers 2 that extend from side to side. A swivel base 3 is mounted on the vehicle body 1 so as to be pivotable. The swivel base 3 is pivotally supported by a hoisting cylinder 4 so as to be raised and lowered, and includes a telescopic boom comprising a plurality of boom stages that are telescopically inserted. 5, a boom side support 6 attached by welding and fixing (see a welding fixing portion 9 in FIG. 3) to the front end side of the top boom 5 a at the most advanced stage of the telescopic boom 5, and an auxiliary jib 7 attached to the boom side support 6. The boom side support 6 and the auxiliary jib 7 are connected by a connecting pin 8 so as to be rotatable. Using this connecting pin 8 as a rotation axis, it is fixed at the extended position when the auxiliary jib 7 is used, and at the retracted position when not used.

  The operation of the first embodiment of the present invention will be described. The mobile crane is transported to the work site, the vehicle body 1 is stopped at the installation location, and the outrigger 2 is extended. Thereafter, the telescopic boom 5 is raised and the telescopic boom 5 is extended and turned to perform crane work. At the time of crane work, the auxiliary jib 7 is fixed to the boom side support 6 with the connecting pin 8 and extended to the extended position as shown in FIG. Then, the wire rope fed out from the winch is hung on the auxiliary jib 7 through the sheave of the top boom 5a, the tip of the wire rope is fixed to the hook block, and the crane work is performed. When the auxiliary jib 7 is temporarily not used, it is stored in the storage position on the side surface of the boom with the connecting pin 8 as an axis as shown in FIG. When the auxiliary jib 7 is used again, it is extended from this storage position to the extension position. During traveling, the connection with the connection pin 8 is released as shown in FIG. 4C, and the auxiliary jib 7 can be removed from the boom side support 6 to reduce the total vehicle weight.

  Next, a second embodiment of the present invention will be described. The second embodiment is different from the first embodiment in that the boom-side support 6 is detachably attached to the tip side surface of the top boom 5a by the attaching / detaching means 10, and the rest is the same. As shown in FIGS. 5 and 6 (a), the boom-side support 6 is attached to the tip side surface of the top boom 5a by a detaching means 10 such as a bolt. The second embodiment thus constructed operates as follows. When using the auxiliary jib 7, as shown in Fig. 6 (a), the auxiliary jib 7 is extended to the extended position, the wire rope fed from the winch is hung on the auxiliary jib 7 through the sheave of the top boom 5a, and the tip of the wire rope is hooked Fix to the block and perform crane work. When the auxiliary jib 7 is temporarily not used, it is stored in the storage position on the side surface of the boom with the connecting pin as an axis as shown in FIG. When the auxiliary jib is used again, it is extended from the retracted position to the extended position. Since the boom side support 6 can be removed by the attaching / detaching means 10 such as a bolt as shown in FIG. 6 (c) during traveling, the total vehicle weight can be further reduced as compared with the first embodiment.

  A third embodiment of the present invention will be described. As shown in FIG. 7, the third embodiment is different from the second embodiment in that the foot pin 11 for the attachment sheave 12 is attached to the side surface of the top boom 5a, and the others are the same. Foot pins 11 for attaching brackets 13 having attachment sheaves 12 for hanging a large number of wire ropes when lifting heavy objects are attached to the left and right side surfaces of the top boom 5a. The left and right foot pins 11 are equal in length and can be attached with a bracket 13 having an attachment sheave 12 at a symmetrical position. The boom side support 6 attached by the attaching / detaching means 10 is attached to avoid the foot pin 11 for the bracket 13 having the attachment sheave 12 attached to the side surface of the top boom, and the boom side support 6 is attached to the tip side surface of the top boom 5a. It can be removed by the attaching / detaching means 10 such as a bolt instead of welding and fixing. Therefore, the foot pin 11 can be shortened by the thickness of the boom-side support 6, and the total weight of the vehicle can be reduced.

  The operation of the third embodiment of the present invention will be described in detail with reference to FIGS. 8A is a front view of the top boom 5a with the conventional foot pin 11 attached, and FIG. 8B is a view in which the bracket 13 having the attachment sheave 12 is attached to the foot pin 11. FIG. -(C) is a cross-sectional enlarged view showing a state in which the bracket 13 provided with the attachment sheave 12 is attached to the foot pin 11 of FIG. 8- (b) so as to surround it. The foot pin 11 is integral with the shaft of the lower sheave 14 of the top boom and extends from the side surface of the top boom. Moreover, the foot pin independent of the axis | shaft of the lower sheave 14 of a top boom may be sufficient. 7 (a) is a front view of the top boom 5a to which the foot pin 11 of the present invention is attached, and FIG. 7- (c) is an enlarged cross-sectional view showing a state in which the bracket 13 having the attachment sheave 12 is attached to the foot pin 11 of FIG. 7- (b) so as to surround it. is there. In each of FIGS. 7- (a), 8- (a), 8- (b), and 8- (c), the auxiliary jib 7 and the connecting pin 8 are omitted. FIG. 8- (c) is an enlarged sectional view of FIG. 8- (b). When lifting a heavy object, the boom side support 6 is removed by the attaching / detaching means 10 as shown in FIG. 7- (b), and the bracket 13 provided with the attachment sheave 12 is attached as shown in FIG. 7- (c). The attachment sheave can be attached to the foot pin by removing the boom side support 6 even if the foot pin 11 is as short as the thickness of the boom side support. That is, the bracket 13 surrounding the foot pin 11 can surround the foot pin 11 by the same amount as the conventional one by removing the boom-side support 6 even if the foot pin 11 is short. Compared to the case where the boom side support 6 cannot be removed by conventional welding and fixing as shown in FIG. 8B, FIG. 7B is the case where the boom side support 6 is removed by the attaching / detaching means 10 and the attachment sheave 12 is attached. Since the provided bracket 13 can be attached, the length of the foot pin 11 from the side surface of the boom may be shorter in Y in FIG. 7- (b) than Z in FIG. 8- (b). It has become possible. In addition, the total vehicle weight can be reduced.

  The storage position of the auxiliary jib 7 may be located on either the left or right side of the top boom 5a.

1 is an overall view according to an embodiment of the present invention. It is an enlarged view of the boom tip of FIG. It is an enlarged view of the front-end | tip of the top boom of FIG. It is explanatory drawing demonstrated with drawing which planarly viewed the extension of the auxiliary jib of the 1st Example, storage, and removal. It is an enlarged view of the front-end | tip of the top boom of 2nd Example. It is explanatory drawing demonstrated with drawing which planarly viewed overhang | projection of the auxiliary jib of 2nd Example, storage, and removal. It is explanatory drawing demonstrated with drawing which looked at the time of attaching the foot pin and attachment sheave of 3rd Example from the boom front end side. It is explanatory drawing demonstrated with drawing which looked at the time of the conventional foot pin and attachment sheave attachment from the boom front end side.

Explanation of symbols

1: Car body 2: Outrigger 3: Turntable 4: Lifting cylinder 5: Telescopic boom 5a: Top boom 6: Boom side support 7: Auxiliary jib 8: Connection pin 9: Welding fixing part 10: Detachment means 11: Foot pin 12: Attachment Sheave 13: Bracket 14: Lower sheave of top boom

Claims (2)

A vehicle body, a swivel base that is pivotably mounted on the car body, a telescopic boom that is pivotally supported by the swivel base by a hoisting cylinder and is telescopically inserted and telescopically inserted into the telescopic boom, and A boom-side support attached to the top side of the top boom at the most advanced stage of the telescopic boom, and an auxiliary jib attached to the boom-side support, and the boom-side support and the auxiliary jib are rotatably connected by a connecting pin, When the auxiliary jib is used, it is projected to the front side of the top boom, and when retracted, it is rotated around the connecting pin and stored on the side of the top boom. When not in use, the connecting pin is released and the auxiliary jib is released. while the boom side support detached so, removably attached by a removable means the boom side supports at the top boom tip side, Boo when not in use of the auxiliary jib Auxiliary jib apparatus for a mobile crane, characterized by being configured so as to remove the side support from the top boom tip side. In Claim 1, The foot pin which protruded sideward from the side surface of a top boom is provided for attachment / detachment of the bracket provided with the attachment sheave, and the boom side support can be attached / detached while avoiding the foot pin. Auxiliary jib device for mobile crane to play.

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