JP6971674B2 - Split base weight - Google Patents

Description

The present invention relates to a counterweight mounted on a swivel body of a mobile crane, and more particularly to a base weight constituting a part of the counterweight.

In a mobile crane, in order to improve workability and safety, a counterweight for balancing the weight is generally attached to the rear part of the swivel body. As a kind of counterweight, a split type counterweight is known in which a plurality of split weights are combined to form a counterweight.

Patent Document 1 discloses one such split counterweight. This split-type counterweight is composed of a base weight mounted on the rear part of the swivel body of a mobile crane and split weights placed on the left and right sides of the base weight. A desired number of split weights are stacked on the left and right sides of the base weight according to the lifting performance of the mobile crane.

Japanese Unexamined Patent Publication No. 2007-223787

In general, since many building materials are accumulated at the work site, the crane work space can only be limited to work using counterweights within the width of the vehicle, and the passage through which the crane vehicle passes. The width of the crane vehicle is often narrowly limited to the width of the traveling body of the crane vehicle.

Further, the base weight attached to the swivel body of the crane vehicle is not limited to that disclosed in Patent Document 1, and usually, the direction of the swivel body is aligned with the direction of the traveling body of the crane vehicle. It overhangs to the left and right beyond the width of the vehicle.

For this reason, for example, as described above, when it becomes necessary to move to a place where a large work space cannot be obtained and perform crane work, or when it becomes necessary to move the crane vehicle at a work site where a passage or the like is narrow, the base is used. It is necessary not only to remove the split weights placed on the left and right sides of the weight from the base weight and lower it, but also to remove the entire base weight from the swing body and lower it. Therefore, it takes time and effort to attach / detach the counterweight at the preparation stage of the crane work or when moving the crane vehicle.

The present invention has been made in consideration of such an actual situation, and an object of the present invention is to provide a base weight that reduces the labor required for the preparation stage of crane work and the movement of a mobile crane. That is.

The present invention is a split type base weight that constitutes a part of a counterweight mounted on a swivel body of a mobile crane, and has a center base weight located behind the swivel body and a center in a state of being mounted on the swivel body. It is composed of a pair of side base weights located on both sides of the base weight. The center base weight is configured to be removable from the swivel body. The side base weight is configured to be removable from the center base weight. The side base weight has a ring to which a lifting wire rope for lifting the side base weight is connected. The side base weight has an insertion portion inserted into the center base weight, the center base weight has a receiving portion for receiving the insertion portion of the side base weight, and the receiving portion of the center base weight has an insertion portion for inserting the side base weight. It has a guide portion that guides the tip portion of the portion. The center base weight and the side base weight each have a bar portion and a hook portion that rotatably support the side base weight with respect to the center base weight by engaging with each other. The side base weight and the center base weight each have a contact portion and a support portion that regulate the rotation of the side base weight with respect to the center base weight around the bar portion by abutting against each other. The center base weight and the side base weight have a center side link plate and a side side link plate, respectively, which are connected to each other to prevent the side base weight from falling off from the center base weight.

According to the split type base weight according to the present invention, by removing the pair of side base weights from the center base weight in the state of being mounted on the swivel body, the crane work space can work using the counter weight within the vehicle width. Crane work can be started quickly without lowering the center base weight in an environment such as a work site where the width of the passage is narrowly limited to the width of the vehicle and the space is limited to Or, you will be able to run a crane car.

Therefore, in the split type base weight according to the present invention, the labor required for the preparation stage of the crane work and the movement of the crane vehicle is reduced.

FIG. 1 shows a mobile crane according to an embodiment. FIG. 2 is a front view of the split counterweight shown in FIG. FIG. 3 is a plan view of the split counterweight shown in FIG. FIG. 4 is a perspective view showing the split counterweight shown in FIG. 1 separately. FIG. 5 schematically shows how the side counterweight group shown in FIG. 4 is removed from the center counterweight group. FIG. 6A shows an initial state of the work of attaching the side base weight to the center base weight. FIG. 6B shows a state in which the insertion portion of the side base weight is completely inserted into the receiving portion of the center base weight. FIG. 6C shows a state in which the hook portion of the side base weight is hung on the bar portion of the center base weight. FIG. 6D shows a state in which the side base weight rotates about the bar portion of the center base weight, and the contact portion of the side base weight abuts on the support portion of the center base weight.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a mobile crane 10 according to the present embodiment. As shown in FIG. 1, the crane vehicle 10 includes a traveling body 20 capable of traveling and a crane 40 installed on the traveling body 20.

The traveling body 20 includes a mounting table 24 on which the crane 40 is mounted, and a driver's seat 26 for controlling the traveling of the traveling body 20. The mounting base 24 is supported by a plurality of wheels 22. The wheels 22 are configured to be driveable by a drive mechanism (not shown), and some wheels 22 are configured to be steerable by a steering mechanism (not shown). The driver's seat 26 is provided with a plurality of control devices such as an accelerator, a brake, and a steering wheel, and these control devices are configured to control the drive and steering of the wheels 22. Further, the mounting table 24 is provided with an outrigger 28 for stably supporting the mounting table 24 with respect to the ground when the crane 40 is working.

The crane 40 includes a swivel body 42 rotatably mounted on a mounting table 24, a boom 46 for lifting a load, and an undulating cylinder 48 for undulating the boom 46. The boom 46 and the undulating cylinder 48 are mounted on the swivel body 42. The swivel body 42 is provided with a driver's seat 44. The driver's seat 44 is provided with a plurality of operating levers and the like, and these operating levers and the like are configured to be able to control the turning of the swivel body 42, the undulation of the boom 46, and other operations such as lifting of a load. Has been done.

The boom 46 is generally stretchable, and depending on the undulation angle of the boom 46, the weight balance of the crane 40 is very high, especially when the undulation angle of the boom 46 is small (close to horizontal) when the boom 46 is extended. Becomes unbalanced. In order to suppress such an imbalance in weight, a counterweight is usually attached to the rear part of the swivel body 42. In the present embodiment, the counterweight mounted on the rear portion of the swivel body 42 is a split type counterweight 100 composed of a plurality of weights.

FIG. 2 is a front view of the split counterweight 100 as viewed from the rear. FIG. 3 is a plan view of the split counterweight 100 as viewed from above. Here, regarding the split type counterweight 100, in the posture attached to the swivel body 42, the direction approaching the swivel axis of the swivel body 42 is the front, and the direction away from the swivel axis of the swivel body 42 is the rear direction.

As shown in FIG. 2, the split counterweight 100 mounted on the rear of the swing body 42 of the mobile crane 10 includes a split base weight 200 detachably configured on the rear of the swing body 42 and a split base. It is composed of a split type loading weight 300 placed on the weight 200.

The split type base weight 200 includes a center base weight 210 located behind the swivel body 42 and a pair of side base weights 260 located on both sides of the center base weight 210 in a state of being mounted on the rear portion of the swivel body 42. have.

The split-type loading weight 300 is mounted on a plurality of split-type center loading weights 310 mounted on the center base weight 210 of the split-type base weight 200 and on the side base weight 260 of the split-type base weight 200. It is composed of a plurality of split type side loading weights 360.

The plurality of split center loading weights 310 are all composed of the same structure. Further, the plurality of split type side loading weights 360 are all configured with the same structure as in the split type center loading weight 310.

Each split-type center loading weight 310 is configured to be stackable with other split-type center loading weights 310. Each split-type center loading weight 310 has a convex portion 312 on the upper surface for positioning and prevention of misalignment, and a concave portion 314 on the lower surface for receiving the convex portion 312. Preferably, each split center loading weight 310 has a plurality of protrusions 312 and a plurality of recesses 314. The convex portion 312 and the concave portion 314 are not limited to this, but are provided at the four corners, for example, as shown in FIG.

Similarly, each split-type side loading weight 360 is configured to be stackable with another split-type side loading weight 360. Each split type side loading weight 360 has a convex portion 362 on the upper surface for positioning and prevention of misalignment, and a concave portion 364 on the lower surface for receiving the convex portion 362. Preferably, each split side loading weight 360 has a plurality of protrusions 362 and a plurality of recesses 364. The convex portion 362 and the concave portion 364 are not limited to this, but are provided at the four corners, for example, as shown in FIG.

Further, the center base weight 210 of the split type base weight 200 has a convex portion 232 that engages with the concave portion 314 of the split type center loading weight 310. Similarly, the side base weight 260 of the split base weight 200 has a convex portion 262 that engages with the recess 364 of the split side loading weight 360.

As shown in FIG. 3, the split center loading weight 310 and the split side loading weight 360 further include a center base weight 210 and a side base on which the split center loading weight 310 and the split side loading weight 360 are mounted. The weight 260 extends along the arc C. The arc C extends, for example, on the circumference centered on the swivel axis of the swivel body 42.

Here, for each split type center loading weight 310, in the posture when mounted on the rear part of the swivel body 42, the direction approaching the swivel axis of the swivel body 42 is the front, and the direction away from the swivel axis of the swivel body 42 is the rear direction. And. Under this assumption, each split-type center loading weight 310 is formed plane-symmetrically with respect to a vertical plane P1 including a straight line extending in the vertical direction through the center and a straight line extending in the front-rear direction through the center. It has been.

Similarly, for each split type side loading weight 360, in the posture when mounted on the rear part of the swivel body 42, the direction approaching the swivel axis of the swivel body 42 is the front, and the direction away from the swivel axis of the swivel body 42 is the rear direction. And. Under this assumption, each split-type side loading weight 360 is formed plane-symmetrically with respect to a vertical plane P2 including a straight line extending vertically through its center and a straight line extending in the front-rear direction through its center. It has been.

In the following description, the orientations of the split center load weight 310 and the split side load weight 360 are all in the posture when the split counterweight 100 is mounted on the rear part of the swivel body 42. That is, front and back refer to the above-mentioned directions along the front and rear, up and down refer to the above-mentioned vertical direction, and left and right or sideways refer to the above-mentioned direction along the arc C. do.

FIG. 4 is a perspective view of the split counterweight 100 as seen from the side mounted on the swivel body 42. In FIG. 4, the center base weight 210, the side base weight 260, the split type center loading weight 310, and the split type side loading weight 360 are drawn separately.

As shown in FIG. 4, the side base weight 260 is configured to be detachably attached to the center base weight 210. The center base weight 210 is configured to be detachably attached to the rear portion of the swivel body 42. The center base weight 210 has a width equal to or less than the vehicle width of the traveling body 20. The side base weight 260 extends to the side of the traveling body 20 in a state where the split type base weight 200 is attached to the rear portion of the rotating body 42 and the directions of the rotating body 42 are aligned with the directions of the traveling body 20. .. Here, in a state where the directions of the turning body 42 are aligned with the directions of the traveling body 20, the front of the turning body 42 coincides with the front of the traveling body 20.

The center base weight 210 has a mounting portion 220 that is detachably attached to the rear portion of the swivel body 42, and a mounting base 230 on which the split type center loading weight 310 is mounted.

The pair of side base weights 260 mounted on both sides of the center base weight 210 with respect to a vertical plane extending in the front-rear direction through the center of the center base weight 210 (for example, the vertical plane P1 shown in FIG. 3). It has a plane-symmetrical structure. The details of the structure will be described later.

A split-type center loading weight 310 is placed on the center base weight 210, and the center base weight 210 and the split-type center loading weight 310 form a center counterweight group CW. Further, a split type side load weight 360 is mounted on the side base weight 260, and the side base weight 260 and the split type side load weight 360 form a side counterweight group SW.

Since the side base weight 260 is removable from the center base weight 210, the side counterweight group SW is removable from the center counterweight group CW. The side counterweight group SW can be removed from the center counterweight group CW using another crane. FIG. 5 schematically shows how the side counterweight group SW is removed from the center counterweight group CW.

1 to 5 show an example in which a plurality of split-type center loading weights 310 are placed on a center base weight 210, and a plurality of split-type side loading weights 360 are placed on a side base weight 260. Although drawn, this is just an example, in which a plurality of split center loading weights 310 and a plurality of split side loading weights 360 are necessarily placed on the center base weight 210 and the side base weight 260, respectively. There is no need to.

For example, depending on the weight required at the time of use, only one split side loading weight 360 may be placed on the side base weight 260, or the split side loading weight on the side base weight 260. No 360 need to be placed.

Similarly, with respect to the split center loading weight 310, only one split center loading weight 310 may be placed on the center base weight 210, or the split center loading weight 210 may be placed on the center base weight 210. No 310 need to be placed.

Further, in order to arrange a device such as a winch at the rear of the swivel body 42, the space is secured by not placing the split type center loading weight 310 on the center base weight 210, and the required weight is the side. It may be obtained by placing the split type side loading weight 360 on the base weight 260.

Subsequently, the details of the structures of the center base weight 210 and the side base weight 260 will be described with reference to FIGS. 4, 6A to 6D.

As shown in FIGS. 6A to 6D, the side base weight 260 has a ring 264 with an inclination angle adjusting function to which a lifting wire rope 290 for lifting the side base weight 260 is connected. The hanging ring 264 with an inclination angle adjusting function has a through hole 264a, and the lifting wire rope 290 is connected to the through hole 264a. The suspension ring 264 with an inclination angle adjusting function has a function of maintaining the side base weight 260 suspended by the lifting wire rope 290 at a predetermined inclination angle. The suspension ring 264 with an inclination angle adjusting function is provided in the recess 266 formed in the side base weight 260, and is configured to be accommodated in the recess 266 by being folded.

As shown in FIGS. 4, 6A to 6D, the side base weight 260 has an insertion portion 270 to be inserted into the center base weight 210. The center base weight 210 has receiving portions 240 on both sides for receiving the insertion portion 270 of the side base weight 260. The insertion portion 270 of the side base weight 260 has an inclined portion 272 formed on the lower side of the tip portion around the tip that is first inserted into the receiving portion 240 so that the thickness gradually decreases as it approaches the tip. Have. The receiving portion 240 of the center base weight 210 has a guide portion 242 that guides the inclined portion 272 of the tip portion of the insertion portion 270 of the side base weight 260.

The center base weight 210 and the side base weight 260 each have a pair of bar portions 246 and a pair of hook portions 276 that rotatably support the side base weight 260 with respect to the center base weight 210 by engaging with each other. ing. By hooking the pair of hook portions 276 of the side base weight 260 on the pair of bar portions 246 of the center base weight 210, the side base weight 260 is rotatably supported with respect to the center base weight 210.

The side base weight 260 and the center base weight 210 each have a contact portion 274 and a support portion 244 that regulate the rotation of the side base weight 260 with respect to the center base weight 210 around the bar portion 246 by abutting against each other. There is. The side base weight 260, in which the hook portion 276 is hooked on the bar portion 246 of the center base weight 210, rotates around the bar portion 246 by its own weight until the contact portion 274 abuts on the support portion 244. By receiving the abutting portion 274 by the support portion 244, the side base weight 260 is held in a constant posture with respect to the center base weight 210, for example, horizontally.

The center base weight 210 and the side base weight 260 each have a pair of link plates 248 and a single link plate 278 that are connected to each other to prevent the side base weight 260 from falling off from the center base weight 210. There is. The pair of link plates 248 each have a through hole 248a, and the link plate 278 has a through hole 278a. In the single link plate 278 and the pair of link plates 248, the hook portion 276 of the side base weight 260 is hung on the bar portion 246 of the center base weight 210, and the contact portion 274 of the side base weight 260 is the center base weight 210. A single link plate 278 is placed between the pair of link plates 248 in contact with the support 244 so that the through hole 278a of the link plate 278 and the through hole 248a of the link plate 248 are aligned with each other. It is configured. The link plates 248 and 278 are connected to each other by passing pins through the through holes 248a and 278a aligned with each other. As a result, the engagement between the hook portion 276 of the side base weight 260 and the bar portion 246 of the center base weight 210 is maintained, and the side base weight 260 is prevented from falling off from the center base weight 210.

Subsequently, the work of attaching the side base weight 260 to the center base weight 210 will be described with reference to FIGS. 6A to 6D.

FIG. 6A shows an initial state of the mounting operation, in which the side base weight 260 is lifted by a lifting wire rope 290 connected to a hanging ring 264 with an inclination angle adjusting function. The side base weight 260 is suspended so as to form a predetermined inclination angle θ with respect to the horizontal plane. The predetermined tilt angle θ is, for example, about 7 degrees, but is not limited to this. From this state, the side base weight 260 is moved horizontally, and the insertion portion 270 is inserted into the receiving portion 240 of the center base weight 210.

The side base weight 260 is horizontally moved until the recess of the hook portion 276 abuts on the bar portion 246 of the center base weight 210. FIG. 6B shows a state in which the hook portion 276 of the side base weight 260 abuts on the bar portion 246 of the center base weight 210, and the insertion portion 270 of the side base weight 260 is completely inserted into the receiving portion 240 of the center base weight 210. Shows.

Subsequently, the lifting wire rope 290 is lowered. As a result, as shown in FIG. 6C, the hook portion 276 of the side base weight 260 is hung on the bar portion 246 of the center base weight 210.

After that, the lifting wire rope 290 is further lowered. As a result, as shown in FIG. 6D, the side base weight 260 rotates about the bar portion 246 of the center base weight 210 until the contact portion 274 abuts on the support portion 244 of the center base weight 210. In this state, the side base weight 260 is in a constant posture with respect to the center base weight 210, for example, in a horizontal state due to the engagement of the hook portion 276 and the bar portion 246 and the contact of the contact portion 274 with the support portion 244. Is maintained at.

Further, in a state where the contact portion 274 is in contact with the support portion 244, the through hole 278a of the link plate 278 of the side base weight 260 and the through hole 248a of the link plate 248 of the center base weight 210 are aligned with each other. Next, a pin (not shown) is passed through the through hole 278a of the link plate 278 and the through hole 248a of the link plate 248. This prevents the side base weight 260 from falling off from the center base weight 210.

Finally, the lifting wire rope 290 is removed from the hanging ring 264 with the tilt angle adjusting function. Further, the hanging ring 264 with an inclination angle adjusting function is folded and accommodated in the recess 266 of the side base weight 260.

Then, if necessary, an appropriate number of split center loading weights 310 are placed on the center base weight 210, and an appropriate number of split side loading weights 360 are placed on the side base weight 260. Will be placed.

The above is a description of the operation of mounting the side base weight 260 on the center base weight 210 and mounting the split type center loading weight 310 and the split type side loading weight 360. The side base weight 260 from the center base weight 210 has been described above. The removal is performed by reversing the procedure described here.

In the split type base weight 200 configured in this way, the side base weight 260 can be attached to and detached from the center base weight 210, and when the side base weight 260 is removed from the center base weight 210, the split type base weight 200 ( The center base weight 210 alone or the composite of the center base weight 210 and the split center loading weight 310) fits within the vehicle width of the traveling body 20 in a state where the directions of the turning body 42 are aligned with the directions of the traveling body 20. ..

Therefore, when moving the crane wheel 10 to which the split type base weight 200 is attached to the rear part of the swivel body 42, by removing the pair of side base weights 260 from the center base weight 210, the direction of the swivel body 42 is the traveling body 20. The width of the split type base weight 200 is suppressed to be equal to or less than the vehicle width of the traveling body 20 in the state where the directions are aligned. Therefore, work using the counter weight within the vehicle width without removing the center base weight 210 from the swing body 42 and lowering the split center loading weight 310 mounted on the center base weight 210. Even in an environment such as a place where only a crane work space can be taken, or a work site where the width of the passage is narrowly limited to the width of the traveling body 20, the crane work can be started quickly, or the crane vehicle can be used. 10 will be able to run. That is, the labor required for the preparation stage of the crane work and the work such as attachment / detachment required when moving the crane vehicle 10 is reduced, and the work time for that purpose is shortened.

Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to these embodiments, and various modifications and changes are made without departing from the gist thereof. May be good.

10 ... Crane car, 20 ... Traveling body, 22 ... Wheels, 24 ... Counterweight, 26 ... Driver's seat, 28 ... Out trigger, 40 ... Crane, 42 ... Swing body, 44 ... Driver's seat, 46 ... Boom, 48 ... Undulating cylinder , 100 ... split counterweight, 200 ... split base weight, 210 ... center base weight, 220 ... mounting part, 230 ... mounting table, 232 ... convex part, 240 ... receiving part, 242 ... guide part, 244 ... support part , 246 ... bar part, 248 ... link plate, 248a ... through hole, 260 ... side base weight, 262 ... convex part, 264 ... hanging ring with tilt angle adjustment function, 264a ... through hole, 266 ... concave part, 270 ... insertion part, 272 ... Inclined part, 274 ... Contact part, 276 ... Hook part, 278 ... Link plate, 278a ... Through hole, 290 ... Lifting wire rope, 300 ... Split type loading weight, 310 ... Split type center loading weight, 312 ... Convex part, 314 ... concave part, 360 ... split type side loading weight, 362 ... convex part, 364 ... concave part, P1 ... vertical plane, P2 ... vertical plane.

Claims (3)

It is a split type base weight that constitutes a part of the counter weight attached to the swivel body of the crane car.
In the state of being attached to the swivel body,
The center base weight located behind the swivel body and
It is composed of a pair of side base weights located on both sides of the center base weight.
The center base weight is configured to be removable from the swivel body.
The side base weight is configured to be removable from the center base weight.
The side base weight has a ring to which a lifting wire rope for lifting the side base weight is connected.
The side base weight has an insertion portion inserted into the center base weight, the center base weight has a receiving portion for receiving the insertion portion of the side base weight, and the receiving portion of the center base weight. Has a guide portion that guides the tip portion of the insertion portion of the side base weight.
The center base weight and the side base weight each have a bar portion and a hook portion that rotatably support the side base weight with respect to the center base weight by engaging with each other.
The side base weight and the center base weight each have a contact portion and a support portion that regulate the rotation of the side base weight with respect to the center base weight around the bar portion by abutting against each other.
The center base weight and the side base weight have a center side link plate and a side side link plate, respectively, which are connected to each other to prevent the side base weight from falling off from the center base weight. Mold base weight. The split-type base weight constitutes the counterweight together with the split-type center loading weight and the split-type side loading weight.
The split type center loading weight is placed on the center base weight.
The split-type base weight according to claim 1, wherein the split-type side loading weight is placed on the side base weight. The center base weight and the side base weight form an arc extending on the circumference of the swivel body together with the split center loading weight and the split side loading weight in forming the counter weight. The split base weight according to claim 2, which extends along the line.

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