JP2006177118A - Counter-weight device of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a counter-weight device of a construction machine capable of removing a counter-weight body only while leaving a support member in a revolving frame in the case of conveyance, etc. and securing a stable mounting state. <P>SOLUTION: A pair of weight supporting beams 13 and 13 are projected backward to the rear end of the revolving frame 8, and the weight body 12 is mounted on bodies 14 and 14 of the weight supporting beams 13 and 13. Support mounting sections 15, etc. are provided to the weight supporting beams 13 and 13, and a support member 11 is mounted to the weight body 12 in an independently detachable state and in a state that no gross weight of the weight body acts thereon. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a counterweight device attached to a rear end portion of an upper swing body in a construction machine such as a hydraulic excavator.

  For example, as shown in FIG. 6, the hydraulic excavator includes a crawler-type lower traveling body 1, an upper revolving body 2 that is mounted on the lower traveling body 1 so as to be rotatable about a vertical axis, and a front of the upper revolving body 2. The counterweight device 4 is provided at the rear end portion of the upper swing body 2 and includes a work attachment 3 attached to the upper portion.

  In the conventional counterweight device 4, as shown in FIG. 7, a heavy weight body 6 is accommodated in a box-shaped support member 5 whose upper surface is open, and a plurality of (two in the illustrated example) mounting bolts 7 are accommodated. Thus, the support member 5 and the weight body 6 are detachably attached to the upper swing body 2 in a lump (see Patent Document 1).

The upper swing body 2 has a swing frame 8 as a base material, and the support member 5 and the weight body 6 are attached to and detached from the swing frame 8. In addition, the weight body 6 is shown as a single object in the figure, but in many cases, the weight body 6 is configured by stacking a plurality of weight bodies vertically.
JP 2003-3524 A

  By the way, the support member 5 (particularly the back surface) plays a role as a display unit for displaying a company name and the like. The front side also serves as a cover for covering the back side of the engine room provided at the rear part of the upper swing body 2.

  However, in the known counterweight device, the support member 5 is removed together with the weight body 6 during transportation as described above, and the above-mentioned role cannot be performed. Therefore, improvement of this point has been demanded by the user.

  It is possible to leave the support member 5 as an emergency measure at the time of transportation or the like and fix it to the revolving frame 8 by some means. However, when removing the weight body, the support member 5 becomes unstable when the mounting bolt 7 is removed, and the support member 5 may be greatly shaken or dropped during the weight body removal process.

  Therefore, the present invention provides a counterweight device for a construction machine in which a support member is left on a revolving frame at the time of transportation or the like, and only a weight body can be removed while ensuring a stable mounting state.

  According to the first aspect of the present invention, an upper swing body is rotatably mounted on the lower traveling body, and a counterweight is attached to a swing frame of the upper swing body. The counterweight holds the weight body and the weight body. In the counterweight device for a construction machine, the support member is attached to the revolving frame, and the weight body is attached to and detached from the revolving frame independently by attachment means different from the support member. It is attached in a state that can be.

  According to a second aspect of the present invention, in the configuration of the first aspect, the support member is formed as a box that accommodates the weight body in a state of surrounding the weight body.

  According to a third aspect of the present invention, in the configuration of the first or second aspect, a weight support beam extending rearward is provided at a rear end portion of the swivel frame, and a support member mounting portion to which the support member is mounted, A weight body attaching portion to which the weight body is attached is provided.

  According to a fourth aspect of the present invention, in the configuration of the third aspect, the support member has a bottom plate, and by projecting a part of the bottom plate upward, the concave portion is seen from the lower surface side, and the projecting portion is seen from the upper surface side. On the other hand, a concave fitting portion that opens downward is provided on the lower surface of the weight body, and the weight support beam is fitted into the concave portion of the support member, and the protruding portion of the support member is fitted into the fitting portion of the weight body. It is comprised as follows.

  According to a fifth aspect of the present invention, in the configuration of the third or fourth aspect, the weight body attaching portion of the weight support beam is configured so that the weight body can be attached in a state where the weight body does not act on the support member. .

  According to a sixth aspect of the present invention, in the configuration of the fifth aspect, the support member has a bottom plate, and the weight support beam is formed by providing a support member mounting portion on a support beam main body as a weight body mounting portion, and the support A convex part that penetrates the bottom plate of the support member upward is provided on the upper surface of the beam body, and the weight body is detachably attached to the support beam body in a state where the weight body is placed on the convex part. .

  The invention according to claim 7 is the structure according to any one of claims 1 to 6, wherein the weight body is divided into a lower lower layer portion and an upper upper portion, and the lower layer portion is detachably attached to the revolving frame, while the upper layer portion Is configured to be detachably attached to the lower layer partial body.

  According to the present invention, since the support member (box body in claim 2) and the weight body can be attached to and detached from the swivel frame (weight support beam in claim 3) independently from each other, the support member can be used during the transportation. It is possible to remove only the weight body while leaving it on.

  That is, even if the weight body is removed, a stable mounting state of the support member can be ensured, and there is no possibility of the support member wobbling or dropping when the weight body is detached. For this reason, the weight body can be safely detached.

  In this case, according to the invention of claim 4, since the support beam and the support member, and the support member and the weight body are respectively concavo-convexly fitted, the mounting state of the support member and the weight body can be further stabilized. Further, the support member and the weight body can be easily attached by the positioning action of the fitting portion.

  Further, according to the inventions of claims 5 and 6, since the weight body is attached to the weight body mounting portion of the weight support beam in a state where a large load does not act on the support member, the support member itself has low strength, and the cost is low. Lightweight.

  In this case, according to the sixth aspect of the present invention, the weight body weight is reliably received by the support beam main body by the convex portion, so that the dimension management for preventing the weight body weight from acting on the support member is facilitated.

  According to the invention of claim 7, the weight body is divided into an upper layer portion and a lower layer portion, and these are separately attached / detached. There is no fear of becoming upset.

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

  As shown in FIG. 1, the counterweight device according to this embodiment includes a support member 11 as a box body whose upper surface is open, and a weight body 12 accommodated in the support member 11. The weight body 12 is separately attached to the revolving frame 8 of the upper revolving body 2 by the following configuration.

  In other words, a pair of left and right weight support beams 13, 13 project rearwardly at the rear end of the revolving frame 8.

  As shown in FIG. 2 and subsequent figures, the weight support beams 13 and 13 are provided with a support beam main body 14 as a hollow weight body mounting portion having an I-shaped cross section and projecting laterally at a plurality of front and rear portions at the lower portion of the main body 14. It is comprised by the support member attaching part 15 ....

  A convex portion 16 is formed on the upper surface of the support beam main body 14 by fixing another member. A plurality of mounting holes (bolt through holes) 17 penetrating the support beam main body 14 in the vertical direction including the convex portion 16 are formed. ... is provided.

  Also, the support member mounting portions 15 are provided with mounting holes 18 penetrating in the vertical direction (for the sake of simplification of the drawings, reference numerals are attached only to FIGS. 2 and 3. The same applies to each portion as necessary). It has been.

  The support member 11 is formed with recesses 20 and 20 viewed from the lower surface side and projecting portions 21 and 21 viewed from the upper surface side by projecting the left and right middle portions of the bottom plate 19 upward (inverted U-shaped cross section). In addition, window holes 22 and 22 through which the convex portions 16 and 16 of the support beam main body 14 pass are provided in the upper surface walls of the projecting portions 21 and 21.

  In addition, a plurality of front and rear screw cylinders (threaded cylinders) 23 are provided on the inner surface of the bottom plate 19 on the sides of the projecting portions 21 and 21.

  As shown in FIGS. 4 and 5, the support member 11 is placed on the weight support beams 13, 13 with the recesses 20, 20 fitting into the support beam main bodies 14, 14. In this state, the support member mounting bolts 24 are screwed into the screw cylinders 23 through the mounting holes 18 of the support member mounting portions 15 and 15.

  As a result, the support member 11 is detachably attached to the support beams 13 and 13 (the turning frame 8).

  In this attached state, the convex portions 16, 16 of the weight body support beams 13, 13 pass through the window holes 22, 22 of the support member 11 and protrude into the member 11.

  Next, the weight body 12 has a laminated structure including lower and middle weight bodies 12a and 12b as a lower layer portion and an upper weight body 12c as an upper layer portion.

  Each step weight body 12a, 12b, 12c may be formed by stacking a plurality of iron plates, concrete plates, and the like.

  On the bottom surface of the lower weight body 12a, concave fitting portions 25, 25 that are opened downward and into which the protruding portions 21, 21 of the support member 11 are fitted are provided.

  Further, mounting plates 26, 26 are provided on the upper surface of the middle weight body 12b, and a plurality of mounting holes 27 are provided across the lower and middle weight bodies 12a, 12b and the mounting plates 26, 26.

  Further, the mounting plates 26, 26 are provided with a plurality of screw holes 28 for attaching the upper weight body on the side of the mounting holes 26.

  On the other hand, the upper weight body 12c is provided with bolt through holes 29 at locations corresponding to the screw holes 28.

  The lower and middle weight bodies 12a, 12b are put into the support member 11 from above in a stacked state.

  At this time, as shown in FIG. 4, the fitting portions 25, 25 of the lower weight body 12a are fitted into the protruding portions 21, 21 of the support member 11, and the top surfaces of the fitting portions 25, 25 are the support beam main body. 14, 14 are in contact with the convex parts 16 and 16, and the weights 16 and 16 support the weight of the weight body.

  In this state, a plurality of lower-layer side mounting bolts 30 are inserted across the mounting holes 27 of the weight bodies 12a and 12b and the mounting holes 17 of the support beams 13 and 13, and are fastened by the nuts 31. .

  As a result, the lower and middle weight bodies 12a and 12b are attached to the support member attachment portions 15 and fixed in the support member 11.

  The upper weight body 12 c is stacked on the middle weight body 12 b in the support member 11, and in this state, the upper layer side mounting bolts 32 are screwed into the screw holes 28 through the bolt through holes 29. The body 12c is detachably attached to the middle weight body 12b.

  As described above, the support member 11 is detachably attached to the support member attachment portions 15 of the weight support beams 13 and 13, and the weight body 12 is detachably attached to the support beam main bodies 14 and 14, respectively.

  According to this configuration, the support member 11 and the weight body 12 can be attached to and detached from the revolving frame 8 (support beams 13 and 13) independently from each other, so that the support member 11 can be attached to the revolving frame 8 as shown in FIG. Only the weight body 12 can be removed while being attached to.

  That is, a stable support member mounting state can be secured while maintaining the role of the support member 11 that displays the company name and the like and covers the back side of the engine room during transportation.

  For this reason, there is no possibility that the support member 11 is wobbled or dropped when the weight body 12 is attached or detached before and after transportation. For this reason, the weight body 12 can be safely detached.

  Further, when the support member 11 and the weight body 12 are attached, the support beams 13 and 13 and the support member 11 and the support member 11 and the weight body 12 are respectively concavo-convexly fitted. The mounting state can be further stabilized.

  Moreover, the support member 11 and the weight body 12 can be easily attached by the positioning effect | action of the said fitting part at the time of attachment.

  Further, in order to attach the weight body 12 to the weight support beams 13 and 13 in a state where the weight body 12 is placed on the convex portions 16 and 16 of the support beam main bodies 14 and 14, that is, in a state where the weight body weight does not act on the support member 11. The support member 11 itself has low strength. For this reason, the material cost and assembly cost of the support member 11 are low, and the member 11 can be lightweight.

  In this case, since the weight body weight is reliably received by the support beam main bodies 14 and 14 by the convex portions 16 and 16, dimensional management for preventing the weight body weight from acting on the support member 11 is facilitated.

  Furthermore, the weight body 12 is divided into an upper layer portion (both lower and middle weight bodies 12a and 12b) and a lower layer portion (upper weight body 12c), and these are attached and detached separately. For example, there is no possibility that the lower layer portion becomes free and shakes when the upper layer portion is removed.

  In addition, attachment of the weight body 12 after transportation or the like is performed by procedures and operations reverse to those at the time of removal. Also in this case, since the support member 11 is firmly fixed to the weight support beams 13, 13, the weight body 12 can be attached safely and easily.

  By the way, in the said embodiment, although the support member 11 was formed as a box, you may form in the frame shape which the left-right both sides became a grid | lattice form or opened, for example.

  In the above embodiment, the weight support beams 13, 13 have the main bodies 14, 14 as the weight body mounting portions and the support member mounting portions 15... Two types of mounting members (for example, beam members) may be provided.

It is a schematic perspective view of the upper revolving structure provided with the counterweight apparatus concerning embodiment of this invention. It is a disassembled perspective view of the same apparatus. FIG. 3 is a partially enlarged view of FIG. 2. It is an expanded sectional view of the assembly state of the same apparatus. FIG. 5 is a view corresponding to FIG. 4 with the weight body removed. 1 is a schematic side view of a hydraulic excavator that is an example to which the present invention is applied. It is a schematic perspective view of the upper turning body of the shovel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 8 Revolving frame 11 Support member 12 Weight body 12a, 12b Lower stage and middle stage weight body 12c which becomes lower layer part of weight body Upper stage weight body which becomes upper layer part of weight body 13 Weight support beam 14 Support beam main body (weight body attaching part)
DESCRIPTION OF SYMBOLS 15 ... Support member attaching part 16 Convex part of support beam main body 17 Mounting hole for weight body attachment 18 Mounting hole for supporting member attachment 19 Bottom plate of support member 20 Recessed part of support member 21 Protrusion part of support member 23 For attaching support member Screw tube 24 Same mounting bolt 25 Weight body fitting portion 27 Mounting hole for lower and middle weight body mounting 28 Screw hole for upper weight body mounting 29 Bolt through hole 30 Mounting bolt for lower and middle weight body mounting 31 Same nut 32 Mounting bolt for upper weight body mounting

Claims (7)

  An upper swing body is pivotably mounted on the lower traveling body, and a counter weight is attached to the swing frame of the upper swing body. The counter weight is composed of a weight body and a support member that holds the weight body. In the counterweight device for a construction machine, the support member is attached to the revolving frame, and the weight body is attached to the revolving frame in a state where it can be attached and detached independently by attachment means different from the support member. A counterweight device for construction machinery.   2. The counterweight device for a construction machine according to claim 1, wherein the support member is formed as a box body that accommodates the weight body while surrounding the weight body.   3. A counterweight device for a construction machine according to claim 1 or 2, wherein a weight support beam extending rearward is provided at a rear end portion of the revolving frame, and a support member mounting portion to which a support member is mounted and a weight A counterweight device for a construction machine, comprising a weight body mounting portion to which a body is mounted.   4. The counterweight device for a construction machine according to claim 3, wherein the support member has a bottom plate, and a part of the bottom plate protrudes upward to form a recess when viewed from the lower surface and a protrusion when viewed from the upper surface. On the other hand, a concave fitting portion that opens downward is provided on the lower surface of the weight body, and the weight support beam is fitted into the concave portion of the support member, and the protruding portion of the support member is fitted into the fitting portion of the weight body. A construction machine counterweight device characterized in that it is configured as described above.   5. The counterweight device for a construction machine according to claim 3 or 4, wherein the weight body attaching portion of the weight support beam is configured so that the weight body can be attached in a state where the weight body does not act on the support member. Counterweight device for construction machinery.   6. The counterweight device for a construction machine according to claim 5, wherein the support member has a bottom plate, and the weight support beam is configured by providing a support member mounting portion on a support beam main body as a weight body mounting portion, and the support beam. The upper surface of the main body is provided with a convex portion penetrating upward through the bottom plate of the support member, and the weight body is configured to be detachably attached to the support beam main body with the weight body placed on the convex portion. Counterweight device for construction machinery.   In the counterweight device for a construction machine according to any one of claims 1 to 6, the weight body is divided into a lower lower layer portion and an upper upper portion, and the lower layer portion is detachably attached to the revolving frame, A counterweight device for a construction machine, wherein an upper layer portion is detachably attached to the lower layer portion.

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