JP4836511B2 - Self-propelled crane counterweight attachment / detachment device - Google Patents

Description

  The present invention relates to a counterweight attaching / detaching device for a self-propelled crane such as a crawler crane or a truck crane.

  In general, a self-propelled crane is equipped with a counterweight at the rear end of an upper swing body, which is a machine body, so as to keep a balance against a moment caused by a load at the time of lifting. The self-propelled crane may not be able to be transported as it is due to road transport conditions (weight restrictions), and it is necessary to remove the counterweight in order to reduce the weight. Conventionally, the counterweight was lifted and removed from the upper swing body using another crane, and both were separately transported to the transportation site, and then the counterweight was mounted on the upper swing body again using another crane. .

  Thus, since it is inconvenient to use another crane, the apparatus which can attach and detach a counterweight by itself is developed (for example, patent document 1).

Registered Utility Model No. 2562475

  FIG. 1 is a partial side view of a self-propelled crane having a counterweight attaching / detaching device disclosed in Patent Document 1, and FIG. 2 is a view taken along the line AA of FIG. In these drawings, A is a self-propelled crane, B is a crawler-type lower traveling carriage, 1 is an upper swing body, 2 is a boom pivotably supported by the upper swing body 1, 3 is a weight base, 4 is A weight 5 is a lifting arm attached to the rear part of the upper swing body 1 so as to be raised and lowered, and is raised and lowered by a hydraulic cylinder 6. 7 is a pendant rope, 8 is a guide sheave for hanging the pendant rope 7, and is attached to the tip of the lift arm 5. 4a is provided on the upper surface of the counterweight, and is an engaging portion that engages one end of the pendant rope 7, and 9 is an engaging portion that is provided on the rear surface of the boom 2 and engages the other end of the pendant rope 7. . Reference numeral 10 denotes a counterweight attaching / detaching device. Reference numeral 11 denotes a bracket for supporting the counterweight attaching / detaching device 10.

  Next, the operation of this device will be described. As shown in FIG. 1, in order to lift the weight 4 indicated by the dotted line placed on the ground behind the self-propelled crane A, the other end of the pendant rope 7 is provided on the rear surface of the boom 2 and locked to the locking portion 9. Then, the pendant rope 7 is hung around the guide sheave 8 so that one end is hung. Next, the boom 2 is raised until indicated by a dotted line, and one end of the pendant rope 7 is locked to the weight 4 placed on the ground. Then, the boom 2 is tilted forward to the state indicated by the alternate long and short dash line, the lift arm 5 is raised to the state indicated by the solid line, and the weight 4 is moved above the weight base 3. Next, the boom 2 is raised until indicated by a solid line, and the weight 4 is lowered onto the weight base 3. The work is completed by fixing the weight 4 to the weight base 3. When the weight 4 fixed to the weight table 3 is lowered to the ground, the procedure is reversed.

  Thus, when attaching and detaching the counterweight 4 by itself, the operator first takes out the pendant rope 7 wound and stored inside the upper swing body 1, and the other end of the pendant rope 7 is connected to the back of the boom 2. The pendant rope 7 needs to be hung around the guide sheave 8 so that one end hangs down, but the other end of the pendant rope 7 is attached to the back of the middle part of the boom 2. Since it is provided and locked to the locking portion 9, the operator holds the pendant rope 7 up to the locking portion 9 and walks on the back of the boom 2 to perform the mounting work, or is performed with a stepladder. There is a problem that the safety of the machine is lowered and the work takes time.

The present invention has been devised in view of such problems of the prior art, and can be easily performed when the attachment / detachment operation is performed by improving the method of storing the pendant rope when the attachment / detachment operation of the counterweight is not performed. It is an object of the present invention to provide a counterweight attaching / detaching device for a self-propelled crane, which can hang a pendant rope around, improve work safety and reduce work time.

  In order to achieve the above object, the self-propelled crane counterweight attaching / detaching device of the present invention is attachable to and detachable from the rear end of the upper revolving unit of a self-propelled crane having a boom pivotably supported by the upper revolving unit. A counterweight mounting / demounting device mounted on the pendant, with a lifting arm attached to the rear of the upper swinging body so that it can be raised and lowered, and one end of the lifting arm can be locked to the counterweight. A guide sheave for hanging the rope is provided, and a locking part for locking the other end of the pendant rope is provided on the back of the boom. The pendant rope is divided into two parts, a front part and a rear part, via a connecting part. A locking part for locking the connecting part of the front pendant rope is provided on the base end side of the boom, and the rear part of the upper swing body is located near the base end of the lift arm. There are provided a locking portion for locking the connecting portion of the undant rope and a locking portion for locking the end portion for locking the counter weight of the rear pendant rope. The rear pendant rope is stored in a state in which two locking portions near the base end of the lifting arm and a guide sheave are hung around.

The self-propelled crane may be a crawler crane or a truck crane.

  Thus, in the counterweight attaching / detaching device of the self-propelled crane of the present invention, the pendant rope is divided into two parts, the front part and the rear part, via the connecting part, and the front pendant rope is connected to the base end side of the boom. The pendant rope is stored in a state extending to the back of the boom, and the rear part of the upper pendant rope is located near the base end of the lift arm. A locking part for locking the connecting part and a locking part for locking the end part for locking the counterweight of the rear pendant rope are provided, and the rear pendant rope is the base end of the lift arm Since it is stored in a state where the two adjacent locking portions and the guide sheave are hung, the operator removes the connecting portion of the pendant rope from the two locking portions before connecting and disconnecting the rear pen. It is only necessary to remove the end portion for locking the counterweight of the rope from the locking portion at the rear of the upper swing body and lock it to the counterweight. This improves work safety and shortens the work time. It has an excellent effect.

FIG. 3 is a side view of a self-propelled crane having the counterweight attachment / detachment device of the present invention, and shows a state during attachment / detachment work. FIG. 4 is a partially enlarged side view of the counterweight attaching / detaching device, showing a state in which the pendant rope is stored without attaching / detaching work. FIG. 5 is a partially enlarged plan view of the counterweight attaching / detaching device, showing a state in which the pendant rope is stored without attaching / detaching work. In these drawings, the same reference numerals are given to the portions common to FIG. 1 or FIG.

  3 to 5, A is a self-propelled crane, B is a crawler-type lower traveling carriage, 1 is an upper swing body, 2 is a boom pivotally supported by the upper swing body 1, and a hydraulic cylinder 2a As a result, the undulation operation is performed. Reference numeral 3 denotes a weight base, and reference numeral 4 denotes a weight, which includes an upper weight 4b and a lower weight 4c. The two weights are fastened by two through pins 4d (see FIG. 5). Reference numeral 5 denotes a lifting arm attached to the rear portion of the upper swing body 1 so as to be raised and lowered. The lifting arm 5 is raised and lowered by a hydraulic cylinder 6. 7A is a pendant rope. A guide sheave 8 for hanging the pendant rope 7 </ b> A is attached to the tip of the lift arm 5.

  As shown in FIG. 5, the pendant rope 7A has two left and right parts, and is divided into a front pendant rope 7a and a rear pendant rope 7b via a connecting part 7d. The connecting portion 7d is composed of a connecting portion 7e (female) of the front pendant rope 7a and a connecting portion 7f (male) of the rear pendant rope 7b, and is connected by a through pin that penetrates the holes of the two connecting portions. Yes. A locking portion 9 for locking the front end 7c of the front pendant rope 7a is provided on the back surface of the middle portion of the boom 2, and a connecting portion 7e of the front pendant rope 7a is provided on the back surface of the base end side of the boom 2. A locking portion 9a is provided for locking (see FIG. 4). The bracket 12 provided at the rear portion of the upper swing body 1 is provided with a locking portion 12a for locking the connecting portion 7f of the rear pendant rope 7b in the vicinity of the proximal end of the lift arm 5, and the upper swing body is provided. A locking portion 13 for locking an end portion 7g for locking the counterweight 4 of the rear pendant rope 7b is provided at a position below the front of the locking portion 12a in the rear portion of 1. The front pendant rope 7a is stored in a state of being extended to the back surface of the boom 2 by two locking portions 9 and 9a. The rear pendant rope 7 b is stored in a state where two locking portions 12 a and 13 near the base end of the lift arm 5 and a guide sheave 8 provided at the tip of the lift arm 5 are hung around. As shown in FIG. 4, the lifting arm 5 can be raised and lowered even when the rear pendant rope 7b is stored.

  Reference numeral 4a denotes an engaging portion that is provided on the upper surface of the counterweight 4 and engages one end 7g of the pendant rope 7A. Reference numeral 10 denotes a counterweight attaching / detaching device. A bracket 12 supports the counterweight attaching / detaching device 10. Reference numeral 14 denotes a fastener that hooks and holds the middle part of the rear pendant rope 7b, and has an L-shape with the tip extending sideways.

6 and 7 are explanatory views showing a method for attaching and detaching the counterweight 4. First, as shown in FIG. 6A, the self-propelled crane A is brought close to the lower weight 4c placed on the ground. Next, as shown in FIG. 6 (B), the boom 2 is raised and the counterweight attaching / detaching device 10 is tilted backward to bring one end 7g of the pendant rope 7 closer to the engaging portion 4a of the lower weight 4c and fastened with a pin. To do. Next, as shown in FIG. 7C, the boom 2 is tilted forward to raise the lower weight 4c. Next, as shown in FIG. 7D, the counterweight attaching / detaching device 10 is raised forward, and the lower weight 4 c is moved directly above the weight table 3. Next, as shown in FIG. 6E, the boom 2 is raised, the lower weight 4c is placed on the weight base 3, and the lower weight 4c is fixed to the weight base 3 with a through bolt (not shown). Next, the upper weight 4b is placed on the lower weight 4c by the same method, and the upper weight 4b is fastened to the lower weight 4c by the through pin 4d.

  Next, the effect of this embodiment is demonstrated. In the counterweight attaching / detaching device 10 of the self-propelled crane A of the present invention, the pendant rope 7A is divided into two parts, a front pendant rope 7a and a rear pendant rope 7b, via a connecting part 7d. A locking portion 9a for locking the connecting portion 7e of the front pendant rope 7a is provided on the side, and the front pendant rope 7a is stored in a state of extending to the back of the boom 2 and is turned upward. The rear part of the body 1 has an engaging part 12a for engaging the connecting part 7f of the rear pendant rope 7b and an end part 7g for engaging the counterweight 4 of the rear pendant rope 7b in the vicinity of the base end of the lifting arm 5. The rear pendant rope 7b hooks two locking portions 12a and 13 near the base end of the lift arm 5 and the guide sheave 8. Since it is stored in a rotated state, the operator removes the connecting portion 7d (7e and 7f) of the pendant rope 7A from the two engaging portions 9a and 12a before connecting and disconnecting the rear pendant rope 7b. It is only necessary to remove the end portion 7g for locking the counterweight 4 from the locking portion 13 at the rear portion of the upper swing body 1 and lock it to the counterweight 4. This improves the safety of the work and shortens the work time. It has an excellent effect of being able to.

  The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the gist of the present invention. For example, although the self-propelled crane has been described as a crawler crane in the present embodiment, it may be a truck crane.

It is a partial side view of the self-propelled crane which has the conventional counterweight attachment or detachment apparatus. It is an AA arrow line view of FIG. It is a side view of the self-propelled crane which has a counterweight attachment / detachment device of the present invention, and shows the state under attachment / detachment work. It is the elements on larger scale of the attachment or detachment device of the counterweight of this invention, and has shown the state which stored the pendant rope. It is the elements on larger scale of the attachment or detachment apparatus of the counterweight of this invention, and has shown the state which stored the pendant rope. It is explanatory drawing which shows the attachment or detachment method of a counterweight. It is explanatory drawing which shows the attachment or detachment method of a counterweight.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper revolving body 2 Boom 3 Weight stand 4 Weight 5 Lifting arm 7A Pendant rope 8 Guide sheave 9 Locking part 9a Locking part 10 Counterweight attaching / detaching device 12a Locking part 13 Locking part

Claims (3)

A counterweight attachment / detachment device detachably mounted on the rear end portion of an upper swing body of a self-propelled crane having a boom pivotably supported by the upper swing body, and lifted to the rear portion of the upper swing body A guide sheave for hanging a pendant rope with one end locked to a counterweight is provided at the tip of the lift arm, and the other end of the pendant rope is locked. The pendant rope is divided into a front part and a rear part via a connecting part, and the connecting part of the front pendant rope is locked to the base end side of the boom. A locking part for locking the connecting part of the rear pendant rope in the vicinity of the base end of the lifting arm and a counter of the rear pendant rope. A locking portion for locking the end portion that locks the weight, the front pendant rope is stored on the upper surface of the boom by two locking portions, and the rear pendant rope is the lift arm. It is stored in a state where the two locking portions near the base end and the guide sheave are wound around, and from one of the two locking portions near the base end of the lifting arm to the other locking portion through the guide sheave. The distance to reach is almost the same at any angle of lifting of the lifting arm, and the lifting arm can be lifted with the rear pendant rope retracted. apparatus. 2. The self-propelled crane counterweight attachment / detachment device according to claim 1, wherein the self-propelled crane is a crawler crane. 2. The self-propelled crane counterweight attachment / detachment device according to claim 1, wherein the self-propelled crane is a truck crane.

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