JP2011011867A - Counterweight structure of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a counterweight structure of a construction machine capable of reducing cost while responding to a request of a customer by using a common counterweight block.SOLUTION: The counterweight block 21 for installing a weight base 20 in a rear part of a turning body having a rotational symmetrical shape of becoming the same when rotating a plane shape by 180° with the vertical axis O as a center on the weight base 20, forming a display surface 21a on one surface of becoming rotational symmetry and forming a non-display surface 21b on the other surface is installed so as to be switchable between a display position positioned at the back face side for visually confirming the display surface 21a from an external part and positioned inside for visually non-confirming the non-display surface 21b from the external part and an non-display position positioned at the back face side for visually confirming the non-display surface 21b from the external part and positioned inside for visually non-confirming the display surface 21a from the external part.

Description

  The present invention relates to a counterweight structure for a construction machine.

  FIG. 3 is a side view showing an example of a crawler crane as a construction machine. In FIG. 3, 1 is a traveling body provided with an endless crawler 2, and 3 is installed on the upper part of the traveling body 1 so as to be rotatable. The swivel body 4 is a jib pivotally attached to the front portion of the swivel body 3 so as to be raised and lowered, and 5 is an A frame.

  The A frame 5 has a vertical frame 5a that is vertically supported with its lower end supported on the rear side of the revolving unit 3, and a lower end that is supported on the front side of the revolving unit 3 and obliquely upward toward the upper end side of the vertical frame 5a. And an inclined frame 5b whose upper end is connected to the upper end of the vertical frame 5a.

  In FIG. 3, 6 is a sheave block provided at the upper end of the A frame 5, 7 is a sheave block connected to a jib support cable 8 having a tip connected to the top of the tip of the jib 4, and 9 is a revolving unit 3. The wire rope for raising and lowering the jib 4 that can be wound and delivered by the arranged jib raising and lowering winch 10 and is laid between the sheave blocks 6 and 7 is suspended from the tip of the jib 4 to suspend the load. A main hook 12 is an auxiliary hook suspended from an auxiliary frame 13 disposed at the tip of the jib 4 to suspend a load.

  In a construction machine such as a crawler crane as shown in FIG. 3, the weight of the jib 4 undulated by winding and unwinding the undulating wire rope 9, and the main hook 11 and the auxiliary hook 12 from the tip of the jib 4. In order to balance the weight of a suspended load (not shown) suspended via the counter, a counterweight 14 is mounted on the rear portion of the revolving unit 3.

  The counterweight 14 has a configuration in which a plurality of counterweight blocks 15, 16, 17, 18A, 18B, 19A, and 19B are stacked, as shown in FIGS. For example, the manufacturer's company name N is cast on the display surface 16a formed on the back side of the weight block 16.

  For example, Patent Documents 1 and 2 show the general technical level of a construction machine having a counterweight as described above.

Japanese Patent Laid-Open No. 9-328781 JP 2001-233586 A

  By the way, depending on the customer who purchases the construction machine having the counterweight 14 as shown in FIGS. 3 and 4, the manufacturer's company name N may be displayed on the display surface 16a formed on the back side of the counterweight block 16. In some cases, it was not desired, or it was desired to display information about the company.

  However, the planar shape of the counterweight block 16 is formed in a shape as shown in FIG. 5, and the display surface 16a must be mounted on the back side that is always visible from the outside. When there is a request from the customer as described above, a counterweight block 16 in which the company name N is not cast on the display surface 16a is newly manufactured, or a part of the company name N is processed and a decorative board is attached. It had to be inconvenient, leading to increased costs.

  In view of such a situation, the present invention is intended to provide a counterweight structure for a construction machine that can meet a customer's request using a common counterweight block and can reduce costs.

The present invention is a counterweight structure of a construction machine in which a counterweight is mounted on the rear part of a revolving structure.
A weight base is attached to the rear part of the swivel body, and on the weight base, one surface has a rotationally symmetric shape that is the same when rotated by 180 ° about the vertical axis and is rotationally symmetric. A counterweight block in which a display surface is formed and a non-display surface is formed on the other surface is displayed on the back side where the display surface is visible from the outside and the non-display surface is positioned inside where the non-display surface is not visible from the outside It is mounted so that it can be switched between a position and a non-display position located on the back side where the non-display surface is visible from the outside and the display surface is not visible from the outside. The present invention relates to a construction machine counterweight structure.

  According to the above means, the following operation can be obtained.

  In a normal case, the counterweight block is attached to the weight base at a display position where the display surface is located on the back side that is visible from the outside and the non-display surface is located on the inner side that is not visible from the outside.

  On the other hand, when a customer who purchases a construction machine does not want the display surface to be visually recognized or wants to display information about the company or the like, the counter weight is compared with the weight base. The block can be mounted at a non-display position located on the back side where the non-display surface is visible from the outside and the display surface is not visible from the outside, and nothing is displayed on the display surface It is not necessary to newly manufacture a counterweight block, and an increase in cost can be avoided.

  In the counterweight structure of the construction machine, the company name can be cast on the display surface of the counterweight block.

  Further, in the counterweight structure of the construction machine, a positioning boss is projected from the upper surface of the weight base, and a positioning recess into which the positioning boss is inserted is formed at a position corresponding to the lower surface of the counterweight block. In this way, the counterweight block can be securely attached to the weight base, and the counterweight block can be prevented from being displaced.

  According to the counterweight structure of the construction machine of the present invention, a common counterweight block can be used to meet a customer's request, and an excellent effect that costs can be reduced can be achieved.

FIG. 3 is a rear view showing an embodiment of the present invention, in which (a) shows a state in which a counter weight block is attached to a weight base at a display position, and (b) shows a counter weight block in a non-display position with respect to the weight base. It is a figure which shows the state attached by. It is a top view which shows the Example of this invention, Comprising: (a) is the IIa-IIa arrow equivalent figure of Fig.1 (a), (b) is the IIb-IIb arrow equivalent figure of FIG.1 (b). . It is a side view which shows an example of the crawler crane as a construction machine. It is a rear view which shows an example of the conventional counterweight, Comprising: It is an IV-IV arrow equivalent view of FIG. It is a top view which shows an example of the conventional counterweight, Comprising: It is a VV arrow equivalent view of FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 and 2 show an embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 3 to 5 denote the same components, and the basic configuration is shown in FIGS. Although the same as the conventional one shown in the figure, the feature of this embodiment is that, as shown in FIGS. 1 and 2, a weight base 20 is attached to the rear portion of the swivel body 3 (see FIG. 3). Above, the display surface 21a is formed on one surface having a rotationally symmetric shape that is the same when the planar shape is rotated by 180 ° about the vertical axis O, and is not displayed on the other surface. The counterweight block 21 formed with the surface 21b is positioned on the back side where the display surface 21a is visible from the outside and the display position (FIG. 1A and FIG. 1A) is located on the inner side where the non-display surface 21b is not visible from the outside. FIG. 2 (a)) and the non-table Switchable between a non-display position (see FIGS. 1B and 2B) where the surface 21b is located on the back side that is visible from the outside and the display surface 21a is located on the inside where the surface 21b is not visible from the outside. It is in the point attached so that.

  In the present embodiment, the manufacturer's company name N is cast on the display surface 21a of the counterweight block 21, while the non-display surface 21b of the counterweight block 21 is a simple smooth surface that displays nothing.

  A positioning boss 28 protrudes from the upper surface of the weight base 20 and a positioning recess 29 into which the positioning boss 28 is fitted is formed at a position corresponding to the lower surface of the counterweight block 21.

  The counter weight blocks 22A, 23A, 24A, 25A, 26A, and 27A are stacked on the left side of the counter weight block 21 on the weight base 20, and the right side of the counter weight block 21 on the weight base 20 is Counterweight blocks 22B, 23B, 24B, 25B, 26B, and 27B are stacked. However, the shape and size of the counterweight block 21 can be variously selected in addition to the present embodiment, and the counterweight blocks 22A, 23A, 24A, 25A, 26A, 27A and the counterweight blocks 22B, 23B, 24B, It is possible to eliminate 25B, 26B, and 27B in some cases.

  Next, the operation of the above embodiment will be described.

  In a normal case, the counterweight block 21 is opposed to the weight base 20 as shown in FIGS. 1 (a) and 2 (a), where the display surface 21a on which the manufacturer's company name N is cast is visible from the outside. The non-display surface 21b is attached at a display position located on the inner side where the non-display surface 21b is not visually recognized from the outside.

  On the other hand, when a customer who purchases a construction machine such as a crawler crane does not want the display surface 21a to be visually recognized or wants to display information about the company, the weight base is used. 20, the counterweight block 21 is positioned on the back side where the non-display surface 21 b is viewed from the outside and the display surface 21 a is viewed from the outside, as shown in FIGS. 1B and 2B. It is possible to mount the counterweight block 21 at a non-display position located on the inner side, and it is not necessary to newly manufacture a counterweight block 21 on which nothing is displayed on the display surface 21a, thereby avoiding an increase in cost.

  Further, a positioning boss 28 protrudes from the upper surface of the weight base 20 and a positioning recess 29 into which the positioning boss 28 is fitted is formed at a position corresponding to the lower surface of the counterweight block 21. It is possible to securely attach the counterweight block 21 to the base 20 and to prevent the counterweight block 21 from being displaced.

  Thus, the customer's request can be met using the common counterweight block 21, and the cost can be reduced.

  In addition, the counterweight structure of the construction machine of the present invention is not limited to the above-described embodiment, but is applicable not only to the crawler crane but also to a construction machine such as a hydraulic excavator. Of course, various changes can be made without departing from the scope of the present invention.

3 Revolving body 4 Jib 20 Weight base 21 Counterweight block 21a Display surface 21b Non-display surface 28 Boss 29 Recess N N Company name O Vertical axis

Claims (3)

In the counterweight structure of a construction machine that has a counterweight mounted on the rear part of the revolving structure,
A weight base is attached to the rear part of the swivel body, and on the weight base, one surface has a rotationally symmetric shape that is the same when rotated by 180 ° about the vertical axis and is rotationally symmetric. A counterweight block in which a display surface is formed and a non-display surface is formed on the other surface is displayed on the back side where the display surface is visible from the outside and the non-display surface is positioned inside where the non-display surface is not visible from the outside It is mounted so that it can be switched between a position and a non-display position located on the back side where the non-display surface is visible from the outside and the display surface is not visible from the outside. Construction machine counterweight structure.   The counterweight structure for a construction machine according to claim 1, wherein a company name is cast on a display surface of the counterweight block.   3. A counterweight structure for a construction machine according to claim 1 or 2, wherein a positioning boss is provided on the upper surface of the weight base and a positioning recess is formed at a position corresponding to the lower surface of the counterweight block.

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