JP2005264431A - Method of manufacturing counterweight for working machine, counterweight, and working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the recycling property of a counterweight while suppressing the movement of a filler even under the long-term use of a hydraulic shovel. <P>SOLUTION: A counterweight body 42 composed of a container body is filled with an iron filler 52. The filler 52 is formed of a granular material composed of an iron-based material. A cover body 44 is put on the filler 52, and the filler 52 is pressed and compressed by the cover body 44. In this state, the cover body 44 is welded to a side part 48 of the counterweight body 42. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a counterweight installed in a work machine such as a hydraulic excavator or a crane, a manufacturing method thereof, and a work machine provided with the counterweight.

  2. Description of the Related Art Conventionally, work machines such as hydraulic excavators and cranes are equipped with counterweights as weights for maintaining the weight balance of the machine body during operation work. This counterweight includes a can-made one and a cast iron-made one. In the can-made one, a container made of a steel plate is filled with a filler. This filler is generally prevented from moving during work by solidifying heavy objects such as metal, iron ore, and iron scraps with concrete.

In view of the fact that a heavy object made of concrete is hard to recycle, for example, Patent Documents 1 and 2 below disclose that the filler is made of only iron. For example, Patent Document 1 discloses an iron ball material packed in a gap between heavy objects such as iron ore and iron scrap. In the same document, it is described that the iron ball material is packed so densely that the movement is suppressed in the gap between the heavy objects. On the other hand, Patent Document 2 describes that iron powder is used as a filler, and the filled iron powder is compacted by a vibration device for compaction.
JP 2002-364023 A JP 2003-41628 A

  However, in the thing of the said patent document 1, although a recyclability can be improved by comprising a filler with an iron thing, the iron ball material with which the clearance gap between heavy objects was filled is so suppressed that the motion. However, since there is only such a description, it is considered that there is a limit to completely contain the movement of the filler.

  Moreover, in what was described in the said patent document 2, although it was set as the filler which made the iron powder compacted into the lump with high density using the vibration apparatus for compaction, in this thing, it is filled at the time of filling Although the material is compacted, it is considered that there is a limit to contain the movement of the filler in the counterweight even when used for a long time.

  Therefore, the present invention has been made in view of such a point, and an object of the present invention is to sufficiently contain the movement of the filler in the counterweight while improving the recyclability of the counterweight. .

  In order to achieve the above object, the present invention is based on a method of manufacturing a counterweight that is filled with a filler and is mounted on a work machine. A filling step, a covering step on the filler, a pressing step of compressing the filler by pressing the lid against the filler, and the lid on the counterweight body with the filler compressed. A lid fixing step of fixing.

  In this counterweight manufacturing method, the lid used to compress the filler is fixed to the counterweight main body, so that it is possible to fix the lid simultaneously with pressing the filler. For this reason, the filler can be sufficiently pressed down to the extent that it is possible to prevent the filler from moving in the counterweight or changing the state of the filler. And since the cover body is being fixed to the counterweight main body, the state which a filler cannot move even if it uses for a long period of time can be maintained.

  Further, if the lid is unlocked, the filler can be taken out from the counterweight body, and since the filler is made of iron, the counterweight can be recycled simply by taking out the filler.

  In the pressing process, the filler is compressed by pressing the lid placed on the filler against the filler by a press, or the lid placed on the filler is pressed against the filler by its own weight. A structure for compressing the material, or a structure in which the lid placed on the filler is bolted to the bottom of the counterweight body and the filler is compressed by pressing the lid against the filler by the fastening force. Is possible. In this way, the filler can be surely pressed down to such an extent that the filler can be prevented from moving in the counterweight or changing the state of the filler even after long-term use. When bolting the counterweight body and the lid body, it can be manufactured by a simple method, and the lid body can be released simply by releasing the bolt fastening, so the lid body can be easily removed during recycling, etc. it can.

  In the pressing step, it is possible to compress the filler by pressing the lid placed on the filler into the inside of the counterweight body and pressing it against the filler. In this way, when the filler is pressed by the lid, the filler can be pressed while being supported by the counterweight body, so that the filler moves or the state of the filler changes. The filler can be reliably compressed to such an extent that it can be suppressed.

  When the counterweight body and the lid are made of iron, in the lid fixing step, the lid can be welded to the counterweight body in a state where the filler is compressed. In this way, the lid can be securely fixed to the counterweight body so that the compressed state of the filler can be maintained.

  In this case, it is good also as a structure including the process of providing a through-hole in the said cover body, and welding a cover body and a filler in the state which plugs up the through-hole of the said cover body with a filler material. In this way, a part of the filler is fixed to the lid and its movement is restricted, so even if the pressing force by the lid is reduced, the filler moves in the counterweight, or the filler The filler can be sufficiently pressed down to prevent the state from changing.

  If the filler is made of a granular material or a powdery material made of an iron-based material, the pressing force by the lid that makes the filler in a compacted state can be easily controlled. As a result, the filler can be pressed to such an extent that the filler can be prevented from moving or changing its state without applying a pressing force more than necessary. Moreover, since the filler is comprised by the granular material or the powdery body, if the fixation of a cover body is cancelled | released, a filler can be taken out easily.

  If the counterweight body is vibrated at least one of the filling material and after filling, the filling material can be easily and reliably charged in a compacted state.

  Further, the present invention presupposes a counterweight that is filled with a filler and is mounted on a work machine, and a counterweight main body configured by a container body, and the iron filler filled in the counterweight main body, The lid may be covered with the filler, and the lid may be pressed against the filler to compress the filler and be fixed to the counterweight body in this state. .

  In this counterweight, the lid body may be bolted to the bottom of the counterweight main body and pressed against the filler by the fastening force.

  Further, in this counterweight, when the lid body is made of iron, the lid body may be provided with a through hole, and the through hole may be welded to the filler in a state where the through hole is closed with a filler material. Good.

  In the counterweight, the filler may be composed of a granular material or a powdery material made of an iron-based material.

  If the counterweight body is provided as a work machine, the effects of the counterweight and the manufacturing method thereof can be effectively exhibited.

  As described above, according to the present invention, the filler is compressed by pressing the lid against the filler, and the lid is fixed to the counterweight body in that state. A counterweight that is sufficiently contained and improved in recyclability can be obtained.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 shows the overall configuration of a crawler excavator 10 as a work machine according to a first embodiment of the present invention. As shown in FIG. 1, the vehicle body (main body) of the excavator 10 includes a lower traveling body 11 and an upper revolving body 12 that is turnably provided at an upper end portion of the lower traveling body 11.

  The lower traveling body 11 is composed of left and right crawler frames 14 and crawlers (both are shown only on one side) 15, and the both side crawlers 15 are individually rotated and driven by left and right traveling motors 16.

  The upper swing body 12 includes a swing frame 17, a driver's cab 18, a machine room 19 and the like. The cab 18 is provided in the front part of the swivel frame 17, and the machine room 19 is arranged behind the cab 18. An engine or the like for driving a hydraulic pump (not shown) is disposed in the machine room 19.

  A work arm 21 and a boom cylinder 23 are provided at the front end of the upper swing body 12. The boom cylinder 23 is configured to expand and contract by hydraulic oil supplied from the hydraulic pump, and the working arm 21 is raised and lowered by the expansion and contraction of the boom cylinder 23.

  The work arm 21 includes a boom 25, an arm 26, and a bucket 27. The tip of the boom cylinder 23 is coupled to the boom 25. The arm 26 is pin-coupled to the tip of the boom 25 and is rotated by the expansion and contraction of the arm cylinder 29. The bucket 27 is pin-coupled to the tip of the arm 26 and is rotated via a link mechanism 33 by the expansion and contraction of the bucket cylinder 31.

  On the other hand, a counterweight 40 serving as a weight for maintaining balance is disposed at the rear end of the machine room 19, that is, the rear end of the upper swing body 12. The counterweight 40 is mounted in order to prevent the vehicle body from falling out of balance and falling during work. The counterweight 40 is configured as a so-called can-making type in which a hollow container is filled with a filler 52 as shown in FIG.

  The hollow container is composed of a counterweight body 42 constituted by a container body whose upper side is opened, and a lid body 44 for closing the opening of the counterweight body 42. The counterweight main body 42 and the lid body 44 are each made of iron. The counterweight main body 42 includes a bottom 46 and a side 48 that stands up from the outer end of the bottom 46, and the bottom 46 and the side 48 are integrally formed. The bottom 46 and the side 48 may be integrally formed by welding steel plates, or may be integrally formed by casting, for example.

  The bottom 46 of the counterweight body 42 is provided with a pair of grooves 50 that extend in the longitudinal direction of the vehicle body. The groove portion 50 is for fitting with a support portion (not shown) protruding from the turning frame 17 when the counterweight 40 is fixed to the turning frame 17.

  Of the side portions 48 of the counterweight main body 42, the front side portion 48 a disposed on the vehicle body front side is formed in a shape corresponding to the shape of the rear end portion of the machine room 19, while the rear side portion 48 b disposed on the vehicle body rear side. Is formed in a curved shape in plan view, for example. 2 schematically shows the shape of the side portion 48, the specific shapes of the side portions 48a and 48b are not shown.

  The lid body 44 is configured to have a shape corresponding to the inner peripheral shape of the side portion 48 of the counterweight body 42, and is disposed so as to enter the inside of the counterweight body 42. In this state, the lid body 44 is welded and fixed to the inner peripheral surface of the side portion 48 of the counterweight body 42.

  Inside the counterweight 40, the filler 52 is filled as described above. The filler 52 is made of a granular material made of an iron-based material. The filler 52 is filled in the counterweight 40 in a consolidated state. In addition, the filler 52 should just be an iron thing, for example, may be comprised with a powdery body, a slab, iron scraps, etc.

  Here, the manufacturing method of the counterweight 40 is demonstrated. First, the counterweight main body 42 is molded, and the counterweight main body 42 is loaded with the filler 52. At this time, if the filler 52 is loaded while vibrating the counterweight body 42, the filler 52 is easily loaded in a compacted state. In this way, the filling material 52 is filled into the counterweight body 42 as a whole. At this time, the filler 52 may be filled so as to rise from the counterweight body 42, or the filler 52 may be filled so as to fit inside the counterweight body 42.

  Then, the lid body 44 is put on the filler 52, and the lid body 44 is pressed downward with a predetermined pressure by a press machine (not shown). As a result, the lid 44 moves downward while being pressed against the filler 52 by receiving a pressing force from the press, and enters the inside of the counterweight body 42. At this time, the lid body 44 moves along the side portion 48 of the counterweight body 42. Thereby, the filler 52 is compressed and becomes a consolidated state. In FIG. 2, the pressing force by the pressing machine is indicated by a white arrow for convenience.

  The lid body 44 is welded to the side portion 48 of the counterweight main body 42 in this state while maintaining the state where the lid body 44 is depressed. Thereby, the compaction state of the filler 52 is maintained. That is, the counterweight main body 42 has such rigidity that it does not easily deform even if it receives a pressing force from the press through the filler 52.

  Therefore, in the manufacturing method of the counterweight 40 according to the present embodiment, the lid body 44 used for compressing the filler material 52 is fixed to the counterweight body 42, so the lid body 44 is attached to the filler material 52. It becomes possible to fix at the same time as pressing. For this reason, the filler 52 can be sufficiently pressed down to such an extent that the filler 52 can move in the counterweight 40 or the state of the filler 52 can be prevented from changing. In other words, the lid body 44 presses and compresses the filler 52, and the lid body 44 is fixed in a state where the filler 52 is compressed, so that the filler 52 can be prevented from moving or changing its state. Can do. And since the cover body 44 is being fixed to the counterweight main body 42, even if the counterweight 40 is used for a long period of time, the state which the filler 52 cannot move can be maintained.

  Further, if the fixing of the lid 44 is released, such as by melting the lid 44, the filler 52 can be taken out from the counterweight main body 42. Since the filler 52 is made of iron, the filler 52 is taken out. Only the counterweight 40 can be recycled. Accordingly, it is possible to obtain the counterweight 40 that can contain the movement of the filler 52 and improve recyclability even when used for a long period of time.

  In the present embodiment, the lid body 44 that covers the filler 52 is pressed against the filler 52 by a press machine, so that the filler 52 can move within the counterweight 40 even when used for a long period of time. The filler 52 can be reliably pressed to such an extent that the state of 52 can be prevented from changing.

  Further, in the present embodiment, since the lid body 44 covered with the filler material 52 enters the inside of the counterweight main body 42 and is pressed against the filler material 52, the filler material 52 is compressed. When the filler 52 is pressed, the filler 52 can be pressed while being supported by the side portion 48 of the counterweight main body 42. For this reason, the filler 52 can be reliably compressed to such an extent that the filler 52 can move in the counterweight 40 or the state of the filler 52 can be prevented from changing.

  Moreover, in this embodiment, since the filler 52 is comprised with the thing of a granular material, the pressing force of the cover body 44 that a granular material will be in a compaction state can be controlled easily. As a result, the filler 52 can be pressed to such an extent that the filler 52 can be prevented from moving or changing its state without applying a pressing force more than necessary. Moreover, since the filler 52 is comprised with the granular material, if the cover body 44 is melted, the filler 52 can be taken out easily.

  In the present embodiment, since the filler 52 is loaded while vibrating the counterweight body 42, the filler 52 can be easily and reliably loaded in a compacted state.

  Note that the counterweight main body 42 may be vibrated after the filler 52 is loaded together with the configuration in which the counterweight main body 42 is vibrated when the filler 52 is loaded, or instead of this configuration. In this case, it is desirable to vibrate the counterweight main body 42 before pressing the lid 44 with the press machine. If possible, the counterweight main body 42 may be vibrated even when pressed by the press machine.

  In the present embodiment, the counterweight 40 may be covered with a cover (not shown) in order to prevent rainwater or the like from accumulating on the upper portion of the counterweight 40 (on the lid 44).

(Embodiment 2)
In the first embodiment, the lid body 44 is pressed by the press machine to compress the filler 52. Instead, the lid body 44 is made of a heavy material such as a thick plate and the weight of the lid body 44 is reduced. It is good also as a structure which sinks the cover body 44 and compresses the filler 52. In this case, the weight of the lid 44 is determined in relation to the filler 52, and the lid 44 is configured by a heavy object that is compressed to such an extent that the filler 52 is brought into a compacted state. Necessary.

  In order to manufacture the counterweight 40, first, as in the first embodiment, the counterweight body 42 is loaded with the filler 52, and the filler 52 is covered with the lid 44. Then, the filler 52 is compressed by the dead weight of the lid 44 and the lid 44 sinks. The lid 44 is welded to the side portion 48 of the counterweight main body 42 after the sinking is completed, that is, the compression of the filler 52 is completed.

  Even with such a configuration, the filler 52 can be pressed to such an extent that the filler 52 can move in the counterweight 40 or the state of the filler 52 can be sufficiently prevented.

  Other configurations and functions and effects are omitted, but are the same as those in the first embodiment.

(Embodiment 3)
As a third embodiment, as shown in FIG. 3, the counterweight body 42 and the lid body 44 may be bolted. In this configuration, the bottom 46 of the counterweight body 42 is provided with a bottomed cylindrical boss (not shown) with a female screw cut, while the lid 44 is inserted with a bolt disposed corresponding to the boss. A hole (not shown) is provided.

  In order to manufacture the counterweight 40, a male screw 54 is erected on the boss portion of the counterweight main body 42, and the filler 52 is loaded in this state. Then, the lid body 44 is put on the filler 52. At this time, the lid body 44 is covered so that the male screw 54 passes through the bolt insertion hole of the lid body 44. Then, a nut 56 is screwed onto the male screw 54, and the nut body 56 is screwed, whereby the lid body 44 receives the fastening force and is pressed against the filler material 52 to compress the filler material 52, so that the inside of the counterweight main body 42 is compressed. Get in. As a result, the filler 52 is brought into a compacted state, and the lid body 44 is fixed to the counterweight body 42 by bolt fastening.

  With such a configuration, it is possible to hold down the filler 52 to such an extent that the filler 52 can be sufficiently prevented from moving or changing the state of the filler 52 in the counterweight 40. In addition, a large-scale apparatus such as a press machine is not necessary, and the manufacturing can be performed by a simple method. Further, since the fixing of the lid body 44 can be released simply by releasing the bolt fastening, the lid body 44 can be easily removed during recycling or the like.

  Other configurations and functions and effects are omitted, but are the same as those in the first embodiment.

(Embodiment 4)
As shown in FIG. 4, the lid 44 and the filler 52 can be welded. Specifically, the lid body 44 is provided with through holes 58 at appropriate positions. Then, after the filler 52 is loaded into the counterweight main body 42, the filler 52 is covered with the lid 44, and the filler 52 is pressed by the lid 44. Then, the lid body 44 is welded to the filler 52 so as to close the through hole 58 of the lid body 44 with a filler material (plug welding). At this time, the lid body 44 is also welded to the side portion 48 of the counterweight body 42.

  In this embodiment, the filler 52 is pressed by the dead weight of the lid 44, a pressing force by a press machine, etc., but a part of the granular material of the filler 52 is welded to the lid 44 and its movement is restricted. Therefore, the pressing force for pressing the filler 52 can be reduced to such an extent that the filler 52 can move in the counterweight 40 or the state of the filler 52 can be prevented from changing.

  In addition, although the through hole 58 is a round hole in the illustrated example, the present invention is not limited to this, and may be, for example, a slit-like through hole 58. Other configurations and functions and effects are omitted, but are the same as those of the first embodiment.

1 is a side view showing an overall configuration of a hydraulic excavator according to Embodiment 1 of the present invention. It is a perspective view of the counterweight which notches and shows a part of side part of the counterweight main body in Embodiment 1 of this invention. It is a perspective view of the counterweight which notches and shows a part of side part of the counterweight main body in Embodiment 3 of this invention. It is a perspective view of the counterweight which notches and shows a part of side part of the counterweight main body in Embodiment 4 of this invention.

Explanation of symbols

40 Counterweight 42 Counterweight body 44 Lid 52 Filler

Claims (14)

A method of manufacturing a counterweight that is filled with a filler and is mounted on a work machine,
Filling the counterweight body constituted by the container body with an iron filler;
A pressing step of covering the filler with a lid and compressing the filler by pressing the lid against the filler;
A method for producing a counterweight for a working machine, comprising: a lid fixing step of fixing the lid to the counterweight body in a state where the filler is compressed.   The method for producing a counterweight for a work machine according to claim 1, wherein, in the pressing step, the filler is compressed by pressing the lid placed on the filler against the filler with a press.   The method of manufacturing a counterweight for a work machine according to claim 1, wherein, in the pressing step, the filler is compressed by pressing the lid over the filler against the filler by its own weight.   The operation according to claim 1, wherein, in the pressing step, the lid placed on the filler is bolted to the bottom of the counterweight body, and the filler is compressed by pressing the lid against the filler by the fastening force. A method for manufacturing a machine counterweight.   The work machine according to any one of claims 1 to 4, wherein, in the pressing step, the filler is compressed by causing the lid placed on the filler to enter the inside of the counterweight body and pressing the filler. For manufacturing counterweight. The counterweight body and the lid are made of iron,
The method for manufacturing a counterweight for a work machine according to any one of claims 1 to 3, wherein, in the lid fixing step, the lid is welded to the counterweight body in a state where the filler is compressed. The lid is provided with a through hole,
The manufacturing method of the counterweight for work machines of Claim 6 including the process of welding a cover body and a filler in the state which plugs up the through-hole of the said cover body with a filler material.   The method for manufacturing a counterweight for a work machine according to any one of claims 1 to 7, wherein the filler is made of a granular material or a powdery material made of an iron-based material.   The method for producing a counterweight for a work machine according to claim 8, wherein the counterweight body is vibrated at least one of when filling the filler and after filling. A counterweight filled with a filler and mounted on a work machine,
A counterweight body constituted by a container body;
The iron filler filled in the counterweight body;
A lid over the filler,
A counterweight for a work machine, wherein the lid is compressed against the filler by being pressed against the filler, and is fixed to the counterweight body in this state.   The work machine counterweight according to claim 10, wherein the lid is bolted to a bottom portion of the counterweight main body and pressed against the filler by the fastening force.   The work machine counter according to claim 10 or 11, wherein the lid is made of iron and provided with a through hole, and the lid is welded to the filler in a state where the through hole is closed with a filler material. weight.   The work machine counterweight according to any one of claims 10 to 12, wherein the filler is made of a granular material or a powdery material made of an iron-based material.   A work machine comprising the work machine counterweight according to any one of claims 10 to 13.

Images