JP6876530B2 - Mobile crane counterweight - Google Patents

Description

The present invention relates to a counterweight provided on a mobile crane.

Patent Document 1 discloses a mobile crane. In such a mobile crane, the boom is raised during work, and the suspended load is lifted by a hook or the like suspended from the tip of the boom. At this time, a counterweight is mounted on the side of the swivel body opposite to the side where the tip of the boom is located with respect to the swivel center. By installing the counterweight, stability when lifting the suspended load is ensured.

Japanese Unexamined Patent Publication No. 2007-223787

At the work site, when the work at one point is completed, it is necessary to move the mobile crane to the next work point. At this time, in a mobile crane for performing work with a counterweight attached as in Patent Document 1, for example, the counterweight is removed from the mobile crane and the counterweight is transported between work points separately from the crane. To do. However, if the counterweight is transported separately from the crane, it is necessary to remove the counterweight from the crane and install the counterweight on the crane, which increases the labor in the work. Therefore, it is required to move the mobile crane at the work site with the counterweight installed on the mobile crane.

Here, when moving at the work site, the width of the vehicle that can be passed is limited or the height of the vehicle that can be passed is limited depending on the building or the like. Therefore, there is a demand for a mobile crane that can move in various conditions at the work site even when the counterweight is installed.

The present invention has been made to solve the above problems, and an object of the present invention is a counterweight that enables the crane to move in various conditions at a work site even when it is installed in a mobile crane. Is to provide.

In order to achieve the above object, the counterweight of the mobile crane according to an embodiment of the present invention is formed with a groove that is recessed downward in the vertical direction, and the groove extends in the central portion in the width direction along the front-rear direction. It can be attached to the main weight at the main weight to be provided and the first attachment position arranged outside the main weight in the width direction, and is inserted into the groove of the main weight. A sub weight that can be attached to the main weight at the attachment position of the above is provided.

According to the present invention, it is possible to provide a counterweight that enables the crane to move at various conditions at the work site even when it is installed on the mobile crane.

FIG. 1 is an outline showing a mobile crane according to the first embodiment in a state where the sub weight is attached to the main weight at the first attachment position and the main weight and the sub weight are installed on the traveling body. It is a figure. FIG. 2 is an outline showing the mobile crane according to the first embodiment in a state where the sub weight is attached to the main weight at the second attachment position and the main weight and the sub weight are installed on the traveling body. It is a figure. FIG. 3 is an outline showing a mobile crane according to the first embodiment in a state where the swivel body is swiveled by 180 ° or substantially 180 ° from the state of FIG. 1 and the main weight and the sub weight are connected to the swivel body. It is a figure. FIG. 4 is a schematic view showing a state in which the mobile crane according to the first embodiment is swiveled by 180 ° or substantially 180 ° together with the main weight and the sub weight from the state of FIG. FIG. 5 is a perspective view schematically showing a state in which the main weight and the sub weight according to the first embodiment are attached to the swivel body. FIG. 6 is a perspective view schematically showing the counterweight according to the first embodiment disassembled for each part. FIG. 7 is a perspective view schematically showing a state in which one of the sub weights is attached to the main weight according to the first embodiment at the second attachment position. FIG. 8 is a schematic view showing a main weight according to the first embodiment and a sub weight arranged at the first mounting position when viewed from above in the vertical direction. FIG. 9 is a schematic view showing a main weight according to the first embodiment and a sub weight arranged at the first mounting position as viewed from the rear side of the counter weight. FIG. 10 is a schematic view showing a main weight according to the first embodiment and a sub weight arranged at the first mounting position when viewed from below in the vertical direction. FIG. 11 is a schematic view showing a main weight according to the first embodiment and a sub weight arranged at a second mounting position when viewed from above in the vertical direction. FIG. 12 is a schematic view showing a main weight according to the first embodiment and a sub weight arranged at a second mounting position as viewed from the rear side of the counter weight.

An embodiment of the present invention will be described with reference to FIGS. 1 to 12.

1 to 4 are views showing the mobile crane 1 of the present embodiment. As shown in FIGS. 1 to 4, the crane 1 includes a traveling body 2 and a swivel body 3 provided on the traveling body 2. The traveling body 2 is provided with a pair of outriggers 5A on both the left and right sides of the front side portion, and a pair of outriggers 5B are provided on both the left and right sides of the rear side portion. During work, the outriggers 5A and 5B are extended in the width direction of the traveling body 2 and the outriggers 5A and 5B are grounded on the ground to support the traveling body 2. The swivel body 3 includes a driver's cab (cab) 6. Further, the base end portion of the telescopic boom 7 is connected to the swivel body 3. The telescopic boom 7 can undulate with respect to the swivel body 3. Further, the swivel body 3 and the telescopic boom 7 swivel together with respect to the traveling body 2 about the swivel center P. Further, the swing body 3 is provided with an actuator 8.

The mobile crane 1 is provided with a counterweight 10. The counterweight 10 includes a main weight 11, a pair of sub weights (side weights) 12A and 12B, and a top weight 13. The top weight 13 is attached to the swivel body 3 independently of the main weight 11 and the sub weights 12A and 12B. Therefore, the top weight 13 swivels alone or together with the main weights 11 and the sub weights 12A and 12B together with the swivel body 3. The top weight 13 is attached to the rear side portion of the swivel body 3, and is located on the swivel body 3 on the side opposite to the side where the tip end portion of the telescopic boom 7 is located with respect to the swivel center P.

1 and 2 show a state in which the outriggers 5A and 5B are grounded after being moved to the work point at the work site. In FIGS. 1 and 2, the attachment positions of the sub weights 12A and 12B to the main weights 11 are different. In FIG. 1, each of the sub weights 12A and 12B is attached to the main weight 11 at the first attachment position described later, and in FIG. 2, each of the sub weights 12A and 12B is main at the second attachment position described later. It is attached to the weight 11. When moving at the work site and in the states shown in FIGS. 1 and 2, the front side of the swivel body 3 is set to coincide with or substantially coincide with the front side of the traveling body 2. The main weights 11 and the sub weights 12A and 12B are installed on the traveling body 2, and in the present embodiment, the main weights 11 and the sub weights 12A and 12B are the traveling bodies 2 with respect to the turning center P of the turning body 3. It is placed on the front side of. In the state shown in FIGS. 1 and 2, even if the swivel body 3 is swiveled, the main weights 11 and the sub weights 12A and 12B do not swivel together with the swivel body 3.

FIG. 3 shows a state in which the swivel body 3 is swiveled by 180 ° or substantially 180 ° from the state shown in FIG. 1, and the main weight 11 and the sub weights 12A and 12B are connected to the swivel body 3. By turning the swivel body 3 by 180 ° or substantially 180 ° from the state shown in FIG. 1 or 2, the front side of the swivel body 3 coincides with or substantially coincides with the rear side of the traveling body 2. In a state where the front side of the swivel body 3 coincides with or substantially coincides with the rear side of the traveling body 2 as shown in FIG. 3, the main weights 11 and the sub weights 12A and 12B are placed on the traveling body 2 by operating the actuator 8. It will be possible to lift from. Then, with the main weight 11 and the sub weights 12A and 12B being lifted by the actuator 8, the main weight 11 and the sub weights 12A and 12B are mounted on the swivel body 3. At this time, the top weight 13 is already attached to the swivel body 3.

By mounting the main weight 11 and the sub weights 12A and 12B on the swivel body 3, the main weight 11 and the sub weights 12A and 12B can swivel together with the swivel body 3, the telescopic boom 7 and the top weight 13. In FIG. 4, the swivel body 3 is swiveled by 180 ° or substantially 180 ° together with the counterweight 10 including the main weight 11, the sub weights 12A, 12B and the top weight 13 from the state shown in FIG. 3, and the front side of the swivel body 3 is shown. Indicates a state in which is coincident with or substantially coincident with the front side of the traveling body 2.

In the work with the crane 1, the telescopic boom 7 is raised with the main weights 11 and the sub weights 12A and 12B attached to the swivel body 3 in the state shown in FIG. 3 and the state shown in FIG. Then, the suspended load is lifted by a hook (not shown) or the like suspended from the tip of the telescopic boom 7. At this time, since the counterweight 10 is mounted on the side of the swivel body 3 opposite to the side where the tip end portion of the telescopic boom 7 is located with respect to the swivel center P, stability when the suspended load is lifted is ensured.

FIG. 5 shows a state in which the main weight 11 and the sub weights 12A and 12B are attached to the swivel body 3. In FIG. 5, the top weight 13 is not attached. Here, the front-back direction of the counter weight 10 (the direction indicated by the arrows X1 and X2) and the width direction of the counter weight 10 (the direction indicated by the arrows W1 and W2) are defined. The front-back direction of the counterweight 10 intersects (substantially perpendicular) with respect to the vertical direction (directions indicated by arrows V1 and V2). Further, the width direction of the counterweight 10 intersects the vertical direction (substantially vertical) and intersects the front-rear direction of the counterweight 10 (substantially vertical). As shown in FIG. 5, the counter weight 10 is in a state where the front-rear direction coincides with or substantially coincides with the front-rear direction of the swivel body 3 and the width direction coincides with or substantially coincides with the width direction of the swivel body 3. It is attached to 3. At this time, the counterweight 10 is attached to the swivel body 3 in a state where the rear side (arrow X2 side) of the counterweight 10 coincides with or substantially coincides with the rear side of the swivel body 3.

Further, when the main weight 11 and the sub weights 12A and 12B are installed on the traveling body 2, the front-rear direction of the connecting body of the main weight 11 and the sub-weights 12A and 12B coincides with or is abbreviated as the front-rear direction of the traveling body 2. The width direction of the connecting body of the main weight 11 and the sub weights 12A and 12B coincides with or substantially coincides with the width direction of the traveling body 2. At this time, the connecting body of the main weight 11 and the sub weights 12A and 12B is installed on the traveling body 2 in a state where the rear side coincides with or substantially coincides with the front side of the traveling body 2. Each of the sub weights 12A and 12B can be attached to the main weight 11 at the first attachment position shown by the dotted line in FIG. Further, each of the sub weights 12A and 12B can be attached to the main weight 11 at the second attachment position shown by the solid line in FIG.

FIG. 6 shows the counterweight 10 disassembled for each component. In FIG. 6, for each of the sub weights 12A and 12B, the state of being arranged at the first attachment position is shown by a dotted line, and the state of being arranged at the second attachment position is shown by a solid line. Further, FIG. 7 shows a state in which one of the sub weights 12A and 12B (sub weight 12A in FIG. 7) is attached to the main weight 11 at the second attachment position. 8 to 10 show sub weights 12A and 12B arranged at the main weight 11 and the first mounting position, and FIGS. 11 and 12 are arranged at the main weight 11 and the second mounting position. 12A and 12B are shown. Here, FIGS. 8 and 11 show a state viewed from the upper side in the vertical direction, and FIGS. 9 and 12 show a state viewed from the rear side of the counterweight 10. Then, FIG. 10 shows a state viewed from the lower side in the vertical direction.

As shown in FIGS. 5 to 12, the main weight 11 has an upper surface 21 facing the upper side (arrow V1 side) in the vertical direction, a bottom surface 22 facing the lower side (arrow V2 side) in the vertical direction, and one side (arrow V2 side) in the width direction. The side surface 23A facing the arrow W1 side, the side surface 23B facing the other side in the width direction (arrow W2 side), the front surface 26 facing the front side (arrow X1 side), and the rear surface 27 facing the rear side (arrow X2 side). Be prepared. A groove 31 is formed on the upper surface 21 of the main weight 11 so as to be recessed downward in the vertical direction. The groove 31 opens upward in the vertical direction and is arranged at the center of the main weight 11 in the width direction. Further, the groove 31 is extended along the front-rear direction, and in the present embodiment, the groove 31 is extended from the front surface 26 to the rear surface 27. The groove 31 includes a groove bottom surface (bottom surface) 32 and groove side surfaces 33A and 33B.

In the first mounting position, the sub weights 12A and 12B are arranged outside the main weight 11 in the width direction. Then, in the first mounting position, the sub weight 12A is arranged outside in the width direction with respect to the side surface 23A, and the sub weight 12B is arranged outside in the width direction with respect to the side surface 23B. Further, in the second mounting position, the sub weights 12A and 12B are inserted into the groove 31. Then, in the second mounting position, the sub weight 12A is arranged inside the groove side surface 33A in the width direction, and the sub weight 12B is arranged inside the groove side surface 33B in the width direction. Further, the dimension of the groove 31 in the width direction of the counterweight 10 is larger than the dimension in the width direction of the telescopic boom 7. Therefore, when the sub weights 12A and 12B are attached to the main weight 11 at the first attachment position, the telescopic boom 7 can be inserted into the groove 31 from the upper side in the vertical direction.

The sub weight 12A includes an upper surface 41A facing upward in the vertical direction and a bottom surface 42A facing downward in the vertical direction. Further, on the sub weight 12A, four extending surfaces 43A, 45A, 46A, 47A are extended between the upper surface 41A and the bottom surface 42A. Each of the extending surfaces 43A and 45A faces a direction intersecting (substantially vertical) with respect to the vertical direction, and the extending surfaces 43A and 45A face opposite to each other. Each of the extending surfaces 46A and 47A faces in a direction that intersects (substantially perpendicular) with respect to the vertical direction and intersects (substantially perpendicular) with respect to the direction in which the extending surfaces 43A and 45A face. The extending surfaces 46A and 47B face each other on opposite sides. Further, the sub weight 12B also includes an upper surface 41B, a bottom surface 42B, and four extending surfaces 43B, 45B, 46B, 47B, similarly to the sub weight 12A.

The extension surface 43A of the sub weight 12A is provided with terrace-shaped insertion protrusions 51A1 and 51A2 that project toward the side on which the extension surface 43A faces. Further, the extension surface 43A is provided with a fitting convex portion 52A that projects toward the side facing the extension surface 43A. The fitting convex portion 52A has a substantially T-shape when viewed from the upper side and the lower side in the vertical direction, and includes a bar portion 53A and a plate portion 55A. The plate portion 55A forms a protruding end of the fitting convex portion 52A. Further, in the present embodiment, the fitting convex portion 52A is located between the insertion convex portions 51A1 and 51A2 in the direction in which the extending surfaces 46A and 47A face.

Further, the side surface 23A of the main weight 11 is provided with insertion recesses 56A1 and 56A2 recessed inward in the width direction, and a fitting recess 57A recessed inward in the width direction. The fitting recess 57A is formed in a shape in which the fitting protrusion 52A can be fitted. Further, a lifting protrusion 58A on which a wire rope or the like can be hooked is formed on the side surface 23A, and a part of the insertion recess 56A2 is formed from the protrusion 58A. Further, in the present embodiment, the fitting recess 57A is located between the insertion recesses 56A1 and 56A2 in the front-rear direction.

When the sub weight 12A is attached to the main weight 11 at the first attachment position, the sub weight 12A is arranged with the extending surface 43A facing the side surface 23A from the outside in the width direction. Further, in the state where the sub weight 12A is attached to the main weight 11 at the first attachment position, the insertion convex portion 51A1 is inserted into the insertion recess 56A1 and the insertion convex portion 51A2 is inserted into the insertion recess 56A2. Then, the fitting convex portion 52A fits into the fitting concave portion 57A (is assembled). By inserting the insertion protrusions 51A1, 51A2 into the corresponding ones of the insertion recesses 56A1, 56A2, each of the insertion recesses 56A1, 56A receives the load of the subweight 12A. Further, the sub weight 12A is firmly connected to the main weight 11 by fitting the fitting convex portion 52A into the fitting concave portion 57A.

Further, the extending surface 43B of the sub weight 12B is also provided with the insertion convex portions 51B1 and 51B2 and the fitting convex portion 52B in the same manner as the extending surface 43A, and the fitting convex portions 52B are the bar portion 53B and the plate. A part 55B is provided. Further, the side surface 23B of the main weight 11 is also provided with the insertion recesses 56B1 and 56B2, the fitting recesses 57B and the protrusions 58B in the same manner as the side surface 23A. When the sub weight 12B is attached to the main weight 11 at the first attachment position, the sub weight 12B is arranged with the extending surface 43B facing the side surface 23B from the outside in the width direction. Then, as in the case of attaching the sub weight 12A to the main weight 11, the insertion protrusions 51B1 and 51B2 are inserted into the corresponding ones of the insertion recesses 56B1 and 56B2, and the fitting protrusions 52B are fitted into the fitting recesses 57B. In the fitted state, the sub weight 12B is attached to the main weight 11 at the first attachment position.

A plurality of curved surfaces 61A1 to 61A3 are provided on the groove bottom surface 32 of the groove 31, and in the present embodiment, three curved surfaces (first curved surface) 61A1 to 61A3 are provided. The curved surfaces 61A1 to 61A3 are arranged at the outer end portion of the groove bottom surface 32 in the width direction, and in the present embodiment, are arranged at the end portion of the groove bottom surface 32 on the side where the groove side surface 33A is located. Further, the curved surfaces 61A1 to 61A3 are adjacent to the groove side surface 33A in the width direction. The curved surfaces 61A1 to 61A3 are arranged apart from each other in the front-rear direction. Further, a plurality of curved surfaces 61B1 to 61B3 are provided on the groove bottom surface 32 of the groove 31, and in the present embodiment, three curved surfaces (first curved surface) 61B1 to 61B3 are provided. The curved surfaces 61B1 to 61B3 are arranged at the outer end portion of the groove bottom surface 32 in the width direction, and in the present embodiment, are arranged at the end portion of the groove bottom surface 32 on the side where the groove side surface 33B is located. Further, the curved surfaces 61B1 to 61B3 are adjacent to the groove side surface 33B in the width direction. The curved surfaces 61B1 to 61B3 are arranged apart from each other in the front-rear direction.

Each of the curved surfaces (first curved surface) 61A1 to 61A3 and 61B1 to 61B3 has an arc shape when viewed from the front side and the rear side. The centers of the arcs of the curved surfaces 61A1 to 61A3, 61B1 to 61B3 are located on the upper side in the vertical direction and inside in the width direction with respect to the curved surfaces (first curved surface) 61A1 to 61A3, 61B1 to 61B3. To do. Each of the curved surfaces (first curved surface) 61A1 to 61A3 and 61B1 to 61B3 is formed by, for example, concave chamfering.

Further, on the groove bottom surface 32, an extension surface 62 is provided between the curved surfaces 61A1 to 61A3 and the curved surfaces 61B1 to 61B3 in the width direction. The extending surface 62 is formed, for example, in a flat shape, and extends along the front-rear direction to the central portion in the width direction on the bottom surface 32 of the groove. Further, at least one extension surface 63A1, 63A2 is provided at the end of the groove bottom surface 32 on the side where the groove side surface 33A is located. Is provided. The extension surface 63A1 is sandwiched between the curved surfaces 61A1 and 61A2 in the front-rear direction, and the extension surface 63A2 is sandwiched between the curved surfaces 61A2 and 61A3 in the front-rear direction. Therefore, the curved surfaces 61A1 to 61A3 and the extending surfaces 63A1 and 63A2 are alternately arranged in the front-rear direction at the end portion of the groove bottom surface 32 on the side where the groove side surface 33A is located.

Further, the extension surfaces 63B1 and 63B2 are provided at the end of the groove bottom surface 32 on the side where the groove side surface 33B is located in the same manner as the extension surfaces 63A1 and 63A2. The curved surfaces 61B1 to 61B3 and the extending surfaces 63B1 and 63B2 are alternately arranged in the front-rear direction at the end of the groove bottom surface 32 on the side where the groove side surface 33B is located.

Further, the groove bottom surface 32 is provided with support projections 65A1 to 65A3 and 65B1 to 65B3 that project upward in the vertical direction (six in the present embodiment). In the present embodiment, the support projection 65A1 is arranged on the extension surface 63A1, and the support projection 65A2 is arranged on the extension surface 63A2. Then, the support projection 65B1 is arranged on the extension surface 63B1, and the support projection 65B2 is arranged on the extension surface 63B2. Further, the support protrusions 65A3 and 65B3 are arranged on the extending surface 62, and in the present embodiment, they are arranged between the curved surfaces 61A2 and 61B2 in the width direction. Then, on the extended surface 62, the support projection 65A3 is located at a portion close to the curved surface 61A2, and the support projection 65B3 is located at a portion close to the curved surface 61B2.

Further, the groove side surface 33A is provided with an extension surface 66A adjacent to the outer side in the width direction with respect to the curved surface 61A2. The extending surface 66A faces upward in the vertical direction. Then, the extending surface 66A is provided with an engaging convex portion 67A protruding upward in the vertical direction. Similarly, the groove side surface 33B is provided with an extension surface 66B adjacent to the outer side in the width direction with respect to the curved surface 61B2, and the extension surface 66B is provided with an engaging convex portion 67B protruding upward in the vertical direction. Be done.

A plurality of curved surfaces (second curved surfaces) 71A1 to 71A3 are provided on the bottom surface 42A of the subweight 12A, and in the present embodiment, three curved surfaces 71A1 to 71A3 are provided. The curved surfaces 71A1 to 71A3 are formed at the end of the bottom surface 42A on the side where the extending surface 43A is located. Further, the curved surfaces 71A1 to 71A3 are arranged apart from each other in the direction in which the extending surfaces 46A and 47A face. Further, each of the curved surfaces 71A1 to 71A3 has an arc shape when viewed from both sides in the direction in which the extending surfaces 46A and 47A face. Each of the curved surfaces (second curved surfaces) 71A1 to 71A3 is formed by, for example, convex chamfering.

Further, on the bottom surface 42A, a flat surface 72A is provided at an end portion on the side where the extension surface 45A is located. The plane 72A extends along the direction in which the extending surfaces 46A and 47A face, and in the present embodiment, the plane 72A extends from the extending surface 46A to the extending surface 47A. Further, at least one leg 73A1, 73A2 is provided at the end of the bottom surface 42A on the side where the extension surface 43A is located, and in the present embodiment, for example, two legs 73A1, 73A2 are provided. Each of the legs 73A1, 73A2 forms a corresponding one of rectangular (substantially rectangular) planes 75A1, 75A2. Further, each of the legs 73A1 and 73A2 projects downward in the vertical direction with respect to the curved surfaces 71A1 to 71A3. The legs 73A1 are sandwiched between the curved surfaces 71A1 and 71A2 in the direction in which the extending surfaces 46A and 47A face, and the legs 73A2 are sandwiched between the curved surfaces 71A2 and 71A3 in the direction in which the extending surfaces 46A and 47A face. Therefore, at the end of the bottom surface 42A on the side where the extension surface 43A is located, the curved surfaces 71A1 to 71A3 and the legs 73A1 and 73A2 are alternately arranged in the direction in which the extension surfaces 46A and 47A face.

When the sub weight 12A is attached to the main weight 11 at the second attachment position, the sub weight 12A is arranged in the groove 31 with the extension surface 43A facing the groove side surface 33A from the inside in the width direction. Further, in a state where the sub weight 12A is attached to the main weight 11 at the second attachment position, the fitting convex portion 52A of the sub weight 12A is fitted with the engaging convex portion 67A of the groove side surface 33A. In a state where the fitting convex portion 52A is fitted with the engaging convex portion 67A, the engaging convex portion 67A is sandwiched between the plate portion 55A of the fitting convex portion 52A and the extending surface 43A. By fitting the fitting convex portion 52A with the engaging convex portion 67A, the sub weight 12A is positioned at the second mounting position in the groove 31.

Further, in the state where the sub weight 12A is positioned at the second mounting position, each of the curved surfaces (second curved surface) 71A1 to 71A3 of the sub weight 12A is the curved surface (first curved surface) 61A1 to 61A3 of the groove 31. It faces the corresponding one and extends along the corresponding one of the curved surfaces (first curved surfaces) 61A1 to 61A3 of the groove 31. At this time, for example, the curved surface 71A1 faces the curved surface 61A1 and extends along the curved surface 61A1. Further, in the state where the sub weight 12A is positioned at the second mounting position, each of the legs 73A1 and 73A2 is sandwiched between the two corresponding curved surfaces 61A1 to 61A3 in the front-rear direction of the counterweight 10. That is, each of the planes 75A1 and 75A2 faces the corresponding one of the extending surfaces 63A1 and 63A2. Further, in a state where the sub weight 12A is positioned at the second mounting position, the flat surface 72A faces the extending surface 62.

When the sub weight 12A is positioned at the second mounting position, the flat surface 75A1 of the sub weight 12A is supported by the support projection 65A1 of the extension surface 63A1, and the flat surface 75A2 is supported by the support projection 65A2 of the extension surface 63A2. Supported by. Then, the flat surface 72A of the sub weight 12A is supported by the support projection 65A3 of the extending surface 62. By supporting the bottom surface 42A of the sub weights 12A by the support protrusions 65A1 to 65A3 as described above, each of the curved surfaces 71A1 to 71A3 has a gap between the curved surfaces 71A1 to 71A3 and the opposing curved surfaces (corresponding one of 61A1 to 61A3). It has and prevents interference with opposite curved surfaces (corresponding one of 61A1 to 61A3).

Similar to the bottom surface 42A of the sub weight 12A, the bottom surface 42B of the sub weight 12B is provided with a plurality of curved surfaces (second curved surface) 71B1 to 71B3, a flat surface 72B, and at least one leg 73B1, 73B2, and the leg 73B1. , 73B2 each form a corresponding one of rectangular (substantially rectangular) planes 75B1 and 75B2. At the end of the bottom surface 42B on the side where the extension surface 43B is located, the curved surfaces 71B1 to 71B3 and the legs 73B1 and 73B2 are alternately arranged in the direction in which the extension surfaces 46B and 47B face.

When the sub weight 12B is attached to the main weight 11 at the second attachment position, the sub weight 12B is arranged in the groove 31 with the extending surface 43B facing the groove side surface 33B from the inside in the width direction. Then, similarly to the attachment of the sub weight 12A to the main weight 11, the fitting convex portion 52B of the sub weight 12B fits with the engaging convex portion 67B of the groove side surface 33B, so that the sub weight 12B becomes the first in the groove 31. It is positioned at the mounting position of 2. In the state where the sub weight 12B is positioned at the second mounting position, each of the curved surfaces (second curved surfaces) 71B1 to 71B3 of the sub weights 12B corresponds to the curved surfaces (first curved surfaces) 61B1 to 61B3 of the groove 31. It faces one and extends along the corresponding one of the curved surfaces 61B1 to 61B3 of the groove 31. Then, in the state where the sub weight 12B is positioned at the second mounting position, each of the legs 73B1 and 73B2 is sandwiched between the two corresponding curved surfaces 61B1 to 61B3 in the front-rear direction of the counterweight 10.

Further, in the state where the sub weight 12B is positioned at the second mounting position, the flat surface 75B1 of the sub weight 12B is supported by the support projection 65B1 of the extension surface 63B1, and the flat surface 75B2 is supported by the support projection 65B2 of the extension surface 63B2. Supported by. Then, the flat surface 72B of the sub weight 12B is supported by the support projection 65B3 of the extending surface 62. Therefore, each of the curved surfaces 71B1 to 71B3 is prevented from interfering with the opposing curved surfaces (corresponding one of 61B1 to 61B3).

Next, the actions and effects of the counterweight 10 and the mobile crane 1 of the present embodiment will be described. In the present embodiment, when the mobile crane 1 is moved at the work site, the main weight 11 and the sub weights 12A and 12B are removed from the swivel body 3, but the crane 1 has the main weight 11 and the sub weight 11. With the weights 12A and 12B installed on the traveling body 2, the weights 12A and 12B move between the work points. Therefore, it is not necessary to transport the counterweight 10 separately from the crane 1, and the labor in the work is reduced.

Further, after the crane 1 has moved to the work point, the swivel body 3 is swiveled so that the front side of the swivel body 3 coincides with or substantially coincides with the rear side of the traveling body 2, and the actuator 8 is operated to operate the main body. The weight 11 and the sub weights 12A and 12B are lifted from the traveling body 2. Then, with the main weight 11 and the sub weights 12A and 12B being lifted from above the traveling body 2, the main weight 11 and the sub weights 12A and 12B are mounted on the swivel body 3. Therefore, after the crane moves to the work site with the main weights 11 and the sub weights 12A and 12B installed on the traveling body 2, the main weights 11 and the sub weights 12A and 12B are easily attached to the swivel body 3. Can be done.

Further, when the connecting body to which the sub weights 12A and 12B are attached to the main weight 11 at the first attachment position is installed on the traveling body 2, the sub weights 12A and 12B are not arranged in the groove, so that the boom 7 is installed. It can be inserted into the groove 31 of the main weight 11. When the boom 7 is inserted into the groove 31, the height of the crane is lower than when the boom 7 is not inserted into the groove 31. Therefore, when the crane 1 moves on the work site with the boom 7 inserted in the groove 31, the crane 1 can easily pass even in a place where the vehicle height that can be passed is limited.

Further, when the sub weights 12A and 12B are attached to the main weight 11 at the second attachment position, the width of the counterweight 10 is wider than that when the sub weights 12A and 12B are attached to the main weight 11 at the first attachment position. The dimension in the direction is small. The dimension in the width direction of the connecting body to which the sub weights 12A and 12B are attached to the main weight 11 at the second attachment position is equal to or less than the dimension in the width direction of the traveling body 2. Therefore, even if the connecting body to which the sub weights 12A and 12B are attached to the main weight 11 at the second attachment position is installed on the traveling body 2, the main weight 11 and the sub weights 12A and 12B are placed on the traveling body 2. The width of the crane 1 does not change from the state where it is not installed. That is, the vehicle width is not increased by the main weight 11 and the sub weights 12A and 12B. Therefore, a vehicle that can be passed by the crane 1 moving on the work site with the connecting body to which the sub weights 12A and 12B are attached to the main weight 11 at the second attachment position is installed on the traveling body 2. The crane 1 can easily pass through even in a place where the width is limited.

As described above, in the present embodiment, the main weights 11 and the sub weights 12A and 12B are the traveling bodies by changing the attachment positions of the sub weights 12A and 12B to the main weight 11 according to the situation of the work site and the like. Even when the crane 1 is installed on the crane 1, the crane 1 can move at various conditions at the work site.

Further, when the sub weights 12A and 12B are attached to the main weight 11 at the second attachment position, the dimensions of the counterweight 10 in the width direction are small as described above. Therefore, even if the connecting body to which the sub weights 12A and 12B are attached to the main weight 11 at the second attachment position is attached to the rotating body 3, the main weight 11 and the sub weights 12A and 12B are attached to the rotating body 3. The turning radius, turning range, and the like of the turning body 3 hardly change from the state where the turning body 3 is not used. That is, it is possible to increase the weight of the counterweight 10 mounted on the swivel body 3 without changing the swivel range or the like of the swivel body 3.

Further, in the present embodiment, the engaging convex portion 67A of the groove side surface 33A of the main weight 11 is fitted with the fitting convex portion 52A of the sub weight 12A, so that the sub weight 12A is placed in the second mounting position in the groove 31. Easy to position. Similarly, by fitting the engaging convex portion 67B of the groove side surface 33B of the main weight 11 with the fitting convex portion 52B of the sub weight 12B, the sub weight 12B is easily positioned at the second mounting position in the groove 31. To.

Further, as described above, in the state where the sub weight 12A is positioned at the second mounting position, each of the curved surfaces (second curved surface) 71A1 to 71A3 of the sub weight 12A is the curved surface (first curved surface) of the groove 31. ) It faces the corresponding one of 61A1 to 61A3 and extends along the corresponding one of the curved surfaces 61A1 to 61A3 of the groove 31. Then, in the state where the sub weight 12A is positioned at the second mounting position, each of the legs 73A1 and 73A2 is sandwiched between the two corresponding curved surfaces 61A1 to 61A3 in the front-rear direction of the counterweight 10. Therefore, when the sub weight 12A is attached to the main weight 11 at the second attachment position, the sub weight 12A is stably held in the groove 31.

Similarly, when the sub weight 12B is positioned at the second mounting position, each of the curved surfaces (second curved surface) 71B1 to 71B3 of the sub weight 12B is the curved surface (first curved surface) 61B1 to 61B3 of the groove 31. It faces the corresponding one of the grooves 31 and extends along the corresponding one of the curved surfaces 61B1 to 61B3 of the groove 31. Then, in the state where the sub weight 12B is positioned at the second mounting position, each of the legs 73B1 and 73B2 is sandwiched between the two corresponding curved surfaces 61B1 to 61B3 in the front-rear direction of the counterweight 10. Therefore, even when the sub weight 12B is attached to the main weight 11 at the second attachment position, the sub weight 12B is stably held in the groove 31.

Further, when the sub weight 12A is attached to the main weight 11 at the second attachment position, the bottom surface 42A of the sub weight 12A is supported by the support protrusions 65A1 to 65A3 as described above, so that the curved surfaces 71A1 to 71A3 are respectively. Is prevented from interfering with the opposing curved surface (corresponding one of 61A1 to 61A3). As a result, the sub weight 12A is prevented from tipping over in the groove 31, and the sub weight 12A is held more stably. Similarly, when the sub weights 12B are attached to the main weights 11 at the second attachment position, the bottom surfaces 42B of the sub weights 12B are supported by the support protrusions 65B1 to 65B3 as described above, so that the curved surfaces 71B1 to 71B3. Each of them is prevented from interfering with the opposite curved surface (corresponding one of 61B1 to 61B3). As a result, the sub weight 12B is prevented from tipping over in the groove 31, and the sub weight 12B is held more stably.

In the above-described embodiment or the like, the counterweight (10) of the mobile crane (1) has a main weight (11) in which a groove (31) recessed toward the lower side (V2) in the vertical direction (V1, V2) is formed. In the main weight (11), the groove (31) is extended along the front-rear direction (X1, X2) in the central portion in the width direction (W1, W2). The counterweight (10) includes subweights (12A, 12B), and the subweights (12A; 12B) are first arranged outside the main weight (11) in the width direction (W1, W2). It can be attached to the main weight (11) at the attachment position, and can be attached to the main weight (11) at the second attachment position inserted into the groove (31) of the main weight (11).

The invention of the present application is not limited to the above-described embodiment, and can be variously modified at the implementation stage without departing from the gist thereof. In addition, each embodiment may be carried out in combination as appropriate as possible, and in that case, the combined effect can be obtained. Further, the above-described embodiment includes inventions at various stages, and various inventions can be extracted by an appropriate combination in a plurality of disclosed constitutional requirements.

1 ... mobile crane, 2 ... traveling body, 3 ... swivel body, 10 ... counter weight, 11 ... main weight, 12A, 12B ... sub weight, 31 ... groove.

Claims (3)

A main weight in which a groove recessed downward in the vertical direction is formed, and the groove extends in the central portion in the width direction along the front-rear direction.
The main weight can be attached to the main weight at a first attachment position arranged outside the main weight in the width direction, and the main weight can be attached to the main weight at a second attachment position inserted into the groove of the main weight. With sub weights that can be attached to
A mobile crane counterweight equipped with. The bottom surface of the groove of the main weight includes a plurality of first curved surfaces at the outer end in the width direction.
Each of the first curved surfaces has an arc shape when viewed from the front side and the rear side, and the first curved surface is arranged apart from each other in the front-rear direction.
The bottom surface of the sub weight includes a plurality of second curved surfaces and at least one leg forming a rectangular plane, and the second curved surface and the legs alternate on the bottom surface of the sub weight. Placed in
In a state where the sub weight is attached to the main weight at the second attachment position, each of the second curved surfaces faces the corresponding one of the first curved surfaces, and the first curved surface is opposed to the corresponding one. Extended along the corresponding one of the above,
When the sub weight is attached to the main weight at the second attachment position, the leg is sandwiched between two corresponding surfaces of the first curved surface in the front-rear direction.
The counterweight of claim 1. The sub weight includes an insertion convex portion and a fitting convex portion.
The main weight includes an insertion recess into which the insertion convex portion is inserted while the sub weight is attached to the main weight at the first attachment position, and the main weight at the first attachment position. A fitting concave portion that fits with the fitting convex portion in a state of being attached to the weight is provided.
The counterweight of claim 1.

Images