JP2008013990A - Counter weight of work machine and method of manufacturing counter weight - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily perform piping and wiring for devices stored in storage spaces and prevent a wasteful space from occurring when the storage spaces separated by a filler are formed in a counter weight formed by filling the filler in the hollow outer shell. <P>SOLUTION: Before the filler 17 is filled, a hollow pipe 23 allowing left and right accumulator storage spaces 11A, 11B to communicate with each other is disposed. The hollow pipe 23 is used as a space for laying a hydraulic pipe 22 connecting accumulators 10 to each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to the technical field of a counterweight and a method for manufacturing the counterweight in a work machine such as a hydraulic excavator.

Generally, in a working machine such as a hydraulic excavator, a front working part for performing various operations such as excavation and loading is mounted on the front part of the machine body, and the balance between the weight of the front working part itself and the work load performed by the front working part. Some have counterweights at the rear of the aircraft. Such a counterweight is generally formed by filling a hollow outer shell made of a steel plate with a filler made of iron, cement, or the like.
By the way, in recent years, even in a working machine such as a hydraulic excavator, from the viewpoint of environmental problems, the energy stored in the accumulator can be reused by accumulating the potential energy of the working unit, or power can be supplied from a battery as a power source. Various models for energy saving and exhaust gas reduction have been developed, such as those provided with an electric motor to be driven or those using a gas engine instead of a diesel engine as a power source. However, such a type of work machine requires a large device such as an accumulator, a large battery, or a gas cylinder, and thus requires a large space for housing these devices.
Therefore, conventionally, a technique has been proposed in which devices such as an accumulator, a large battery, or a gas cylinder are housed in the internal space of the counterweight (see, for example, Patent Documents 1, 2, and 3).
On the other hand, work machines such as excavators are not suitable for long-distance travel and high-speed travel, so they are often transported to transport sites by transport vehicles. In this case, considering legal regulations and ease of transport, etc. In some cases, the counterweight is removed from the airframe and transported. For this reason, a device for easily attaching and detaching a counterweight to and from the airframe is provided. As one of such devices, conventionally, a counterweight is suspended by a suspension member such as a chain, and in this state A weight moving device that can be moved up and down with respect to the airframe is known (for example, see Patent Document 4). The weight moving device is configured to suspend the central portion of the counterweight in the left-right direction in order to maintain a balance when the counterweight is suspended, and in the state where the counterweight is mounted on the airframe, It is configured to be stored in a weight moving device storage space formed at the center in the left-right direction of the weight.
JP 2004-116676 A JP 2003-328392 A JP 2001-40705 A Japanese Patent Laid-Open No. 11-1940

By the way, when storing devices such as an accumulator, a battery, or a gas cylinder in the internal space of the counterweight as in Patent Documents 1, 2, and 3, hydraulic piping, electrical wiring, gas pipes, etc. connected to these devices However, in Patent Documents 1 and 2, it is unclear, and in Patent Document 3, as shown in FIG. 2B of Patent Document 3, A gas pipe is arranged in a space formed in the upper part of the counterweight. However, in this case, the space occupied by the gas pipe in the upper space of the counterweight is practically very small, and the others are merely useless empty spaces, and the counterweight is unnecessarily enlarged. There is a problem.
On the other hand, in the counterweight in which the weight moving device is housed in the central portion in the left-right direction as in Patent Document 4, when an instrument such as an accumulator, a battery, or a gas cylinder is to be housed in the counterweight, How to place the accumulator and other devices with respect to the weight moving device in the center of the direction is a problem. For example, when storing multiple accumulators, place the accumulators on the left and right sides of the weight moving device. It is advocated. However, in this case, it is a problem how to arrange the hydraulic piping that connects the accumulators arranged on the left and right sides with the weight moving device interposed therebetween, and there is a problem to be solved by the present invention.

The present invention has been made in order to solve these problems in view of the above circumstances, and the invention of claim 1 is a counter comprising a hollow outer shell filled with a filler. In the weight, the counterweight is provided with a storage space separated by the filler and a hollow tube communicating with the storage space through the filler, and the hollow tube is stored in the storage space. This is a counterweight in a work machine, characterized in that it is a space for piping and wiring to be connected to the equipment devices.
And by doing in this way, the piping and wiring arrangement space connected to the storage devices separated in the storage space separated by the filler can be passed through the filler and communicated with the storage space. Therefore, piping and wiring to equipment can be performed easily and efficiently, and there is no useless space for piping and wiring, and there is no counterweight. Necessary enlargement can be avoided.
In the invention of claim 2, in providing a storage space partitioned by the filler in a counterweight formed by filling a hollow outer shell with the filler, the storage space is filled before filling the filler. A counter pipe in a work machine, characterized in that a hollow pipe communicating with the pipe is connected to a device connected to the equipment stored in the storage space, and a wiring space is provided. Is the method.
And by doing in this way, the piping connected to the apparatus apparatus accommodated in the storage space, and the hollow pipe used as the wiring arrangement space can be freely prevented without being obstructed by the packing that separates the storage space. And since it can arrange | position easily and this hollow tube does not come to support filling operation | work, a counterweight can be manufactured in a conventional filling process.
The invention according to claim 3 is the counterweight in the working machine according to claim 1, wherein the end of the hollow tube is integrally connected to a partition plate that partitions the storage space from the filler.
And by doing in this way, the hollow pipe | tube connected to a storage space can be arrange | positioned easily.
The invention of claim 4 provides a plurality of storage spaces separated by the filler, and the hollow tube is stored as much as possible to provide piping and wiring arrangement space for connecting the equipment devices stored in these storage spaces. The counterweight in a work machine according to claim 1 or 3, wherein the counterweight is arranged so as to communicate between spaces.
And by doing in this way, the piping which connects the apparatus apparatus accommodated in the several storage space divided by the filler, and the arrangement space of wiring can be ensured with a hollow tube.
According to a fifth aspect of the present invention, there is provided a weight moving device storage space formed as a storage space separated by the filling material in a central portion of the counterweight in the left-right direction, and storing a weight moving device for moving the counterweight up and down The left and right hydraulic device storage spaces are formed on both the left and right sides of the weight moving device storage space, and are provided with left and right hydraulic device storage spaces for storing hydraulic devices such as accumulators. 5. The counterweight in a work machine according to claim 4, wherein the hollow pipe is provided with hydraulic piping for connecting the hydraulic devices stored in the left and right hydraulic device storage spaces.
By doing so, the weight moving device and the plurality of hydraulic devices can be stored in the counterweight in an orderly manner without generating unnecessary empty space, and the hydraulic devices stored in the left and right hydraulic device storage spaces can be stored together. The space for the hydraulic piping to be connected can be secured by a hollow tube that communicates between the left and right hydraulic equipment storage spaces through the filling.

  Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a hydraulic excavator as an example of a work machine. The hydraulic excavator 1 includes a crawler-type lower traveling body 2, an upper revolving body 3 that is pivotably supported above the lower traveling body 2, The front working unit 4 is mounted on the front part of the upper swing body 3 and the rear part of the upper swing body 3 includes the weight of the front work unit 4 itself and the work load performed by the front work unit 4. A counterweight 5 is mounted for balancing.

  The front working unit 4 includes a boom 6 whose base end is supported by the upper swing body 3 so as to be swingable up and down, an arm 7 supported at the tip of the boom 6 so as to be swingable back and forth, and a tip of the arm 7 It is comprised from the bucket 8 etc. which are attached to a part. The potential energy of the front working unit 4 increases as the boom 6 is raised, but the potential energy is obtained by guiding oil discharged from the boom cylinder 9 to the accumulator 10 when the boom 6 is lowered. While being accumulated as hydraulic energy, the hydraulic energy accumulated in the accumulator 10 is configured to be supplied to the boom cylinder 9 when the boom 6 is raised, and thus the potential energy of the front working unit 4 is provided. Can be recovered and reused.

  In the present embodiment, three accumulators that are optimal for accumulating hydraulic energy are used as the accumulator 10, but these three accumulators 10 are provided inside the counterweight 5 as will be described later. Are stored in left and right accumulator storage spaces (corresponding to the hydraulic device storage space of the present invention) 11A and 11B. The accumulator 10 is not limited to the bladder type but may be a piston type.

  The counterweight 5 is attached to the rear portion of the upper swing body 3 as described above. In order to move the counterweight 5 up and down so that the counterweight 5 can be easily attached and detached during transportation or the like. The weight moving device 12 is attached to the center portion of the rear surface portion 3a of the upper swing body 3 in the left-right direction so as to protrude rearward from the rear surface portion 3a.

  The weight moving device 12 includes a hydraulic cylinder 13, a sprocket 14 that moves up and down based on the expansion and contraction operation of the hydraulic cylinder 13, and a chain 15 that is suspended around the sprocket 14. One end side is fixed to the rear surface part 3 a side of the upper swing body 3, while the other end side is detachably fixed to the central portion in the left-right direction of the counterweight 5. Then, with the other end of the chain 15 fixed to the counterweight 5, the hydraulic cylinder 13 is expanded and contracted to move the sprocket 14 up and down, so that the counterweight 5 suspended from the chain 15 is moved upward. It is comprised so that it can be moved up and down with respect to the turning body 3. FIG. The counterweight 5 is detachably fixed to the upper swing body 3 by fixing means such as a bolt (not shown), and the vertical movement of the counterweight 5 by the weight moving device 12 is fixed by the fixing means. It is performed in the state that is released.

  On the other hand, the counterweight 5 is filled with a filler 17 mainly composed of iron, water, cement, etc. in a hollow outer shell 16 made of a steel plate that forms the outer shell of the counterweight 5. However, a weight moving device storage space 18 for storing a weight moving device 12 protruding rearward from the rear surface portion 3a of the upper swing body 3 is formed in the central portion of the counterweight 5 in the left-right direction. Further, left and right accumulator storage spaces 11A and 11B in which the accumulator 10 is stored are formed on the left and right sides of the weight moving device storage space 18, respectively. The weight moving device storage space 18 and the left and right accumulator storage spaces 11A and 11B are open on the front side (the side facing the rear surface portion 3a of the upper swing body 3), while the left and right side surfaces and the back side are filled with the filler 17. Thus, the storage spaces 18, 11 </ b> A, and 11 </ b> B are separated by the filler 17. 20A and 20B are partition plates for partitioning the left and right accumulator storage spaces 11A and 11B from the filler 17, and these partition plates 20A and 20B are integrally fixed to the outer shell 16 by welding or the like. ing.

  In the left and right accumulator storage spaces 11A and 11B, three accumulators 10 are stored as described above. In the present embodiment, one accumulator 10 is stored in one accumulator storage space 11A and the other is stored in the other accumulator storage space 11A. In the accumulator storage space 11B, two accumulators 10 are stored in a state of being installed on the installation bases 21A and 21B, respectively. The accumulators 10 stored in the left and right accumulator storage spaces 11A are connected to each other via a hydraulic pipe (hydraulic hose) 22. The hydraulic pipe 22 is arranged through a hollow pipe 23 described later. It is installed. The accumulator 10 is connected to the hydraulic pipe 22 through oil passages (not shown) formed in the installation bases 21A and 21B, and is also stored in the other accumulator storage space 11B. The two are connected by an oil passage formed in the installation table 21B.

  The hollow tube 23 has an inner diameter that allows the hydraulic piping 22 to be easily inserted, and communicates between the left and right accumulator storage spaces 11A and 11B through the back side of the weight moving device storage space 18. However, both ends of the hollow tube are integrally connected to the partition plates 20A and 20B partitioning the left and right accumulator storage spaces 11A and 11B and the filler 17 by welding or the like, and the left and right accumulators It arrange | positions through the inside of the filling 17 with which it fills between storage space 11A, 11B.

  By the way, as described above, the counterweight 5 is formed by filling the outer shell 16 with the filler 17. In this case, the partition plates 20 </ b> A and 20 </ b> B are not filled with the filler 17. The left and right accumulator storage spaces 11A and 11B are separated from the filler 17 by the outer shell body 16, and the hollow pipe 23 through which the hydraulic pipe 22 is inserted is also filled with the filler 17. Before being connected to the partition plates 20A and 20B. That is, the filling material 17 is filled in a state where the hollow tube 23 is disposed in advance.

  In the figure, 24 is a hydraulic pipe extending from the accumulator 10 to the upper swing body 3 side. Furthermore, the upper surface side of the weight moving device storage space 18 is opened so that the sprocket 14 can move upward from the upper surface of the counterweight 5, and the upper surface sides of the left and right accumulator storage spaces 11A and 11B are also The accumulator 10 is opened so that maintenance such as replenishment of filled gas can be performed, but these openings are covered with a cover (not shown) so as to be opened and closed.

  In the present embodiment configured as described, a weight moving device storage space 18 in which a weight moving device 12 for moving the counter weight 5 up and down is stored is formed in the central portion of the counter weight 5 in the left-right direction. The left and right accumulator storage spaces 11A and 11B in which the accumulator 10 is stored are formed on the left and right sides of the weight moving device storage space 18, and the storage spaces 18, 11A and 11B are separated by a filler 17. Thus, the weight moving device 12 and a plurality of (three in this embodiment) accumulators 10 can be stored in an orderly manner without generating a wasteful empty space in the counterweight 5. In the left and right accumulator storage spaces 11A and 11B. Is the hydraulic pipe 22 for connecting the accumulator 10 to each other is will be arranged right and left of the accumulator storage space 11A, the inter-11B through the hollow tube 23 which communicates with. In this case, the hollow tube 23 is disposed through the filling 17 that separates the left and right accumulator storage spaces 11A and 11B, but the hollow tube 23 is disposed before the filling 17 is filled. In other words, the filling material 17 is filled with the hollow tube 23 disposed in advance.

  As a result, it is possible to secure a space for disposing the hydraulic piping 22 that connects the accumulators 10 separated by the filler 17 only by disposing the hollow tube 23. The hollow tube 23 is arranged through the filling 17 and can be easily and efficiently performed. Unnecessary enlargement of 5 can be avoided. In addition, since the hollow tube 23 is disposed before the outer shell body 16 is filled with the filler 17, the hollow tube 23 can be disposed freely and easily without being obstructed by the filler 17. Since the empty tube 23 does not support the filling operation, the counterweight 5 can be manufactured by a conventional filling process.

  Further, the hollow tube 23 is simply connected to the partition plates 20A and 20B for partitioning the left and right accumulator storage spaces 11A and 11B and the filler 17 by welding or the like at both ends thereof. The left and right accumulator storage spaces 11A and 11B are arranged to communicate with each other, and thus the hollow tube 23 can be easily arranged.

In addition, of course, this invention is not limited to the said embodiment, In the said embodiment, the hollow cage | basket is formed so that it may connect between the some storage space formed in a counterweight. However, the present invention is not limited to the hollow tube communicating between the storage spaces as described above. For example, when the storage space formed in the counterweight is separated from the upper revolving body by the filler, the packing By providing a hollow tube that communicates with the storage space from the upper revolving unit side through the interior, the hollow tube extends from the upper revolving unit side and is connected to equipment devices that are stored in the storage space. It can be used as a storage space.
Furthermore, the storage space formed in the counterweight can store not only hydraulic devices such as weight moving devices and accumulators, but also various devices such as batteries and gas cylinders. Various hydraulic pipes, electrical wiring, gas pipes, and the like can be provided corresponding to the equipment devices stored in the storage space.

It is a side view of a hydraulic excavator. It is a perspective view of the counterweight which shows the state in which the weight moving apparatus and the accumulator were stored. It is a top view of the counterweight which shows the state in which the weight moving apparatus and the accumulator were accommodated. It is a perspective view of the counterweight which shows the state which has arrange | positioned hydraulic piping to the hollow tube. It is a front view of the counterweight which shows the state which has arrange | positioned hydraulic piping to the hollow tube. It is a partial cross section side view of the counterweight which shows the state which has arrange | positioned hydraulic piping to the hollow pipe.

Explanation of symbols

5 Counterweight 10 Accumulator 11A, 11B Accumulator storage space 12 Weight transfer device 16 Outer shell 17 Filler 18 Weight transfer device storage space 20A, 20B Partition plate 22 Hydraulic piping 23 Hollow tube

Claims (5)

  A counterweight in which a hollow outer shell is filled with a filler, wherein the counterweight is provided with a storage space separated by the filler, and a hollow tube communicating with the storage space through the filler. A counterweight in a working machine, wherein the hollow pipe is used as a space for piping and wiring connected to equipment devices stored in a storage space.   In providing a storage space separated by the filler in a counterweight formed by filling the hollow outer shell with the filler, a hollow tube communicating with the storage space before filling the filler is provided. A method for manufacturing a counterweight in a work machine, characterized in that the hollow pipe is disposed as a space for piping and wiring connected to equipment devices stored in a storage space.   The counterweight in the working machine according to claim 1, wherein the end of the hollow tube is integrally connected to a partition plate that partitions the storage space from the filler.   A plurality of storage spaces separated by the filler are provided, and the hollow tube communicates between the storage spaces as much as possible as the piping and wiring arrangement space for connecting the equipment devices stored in these storage spaces. The counterweight in the work machine according to claim 1, wherein the counterweight is arranged.   A weight moving device storage space for storing a weight moving device for moving the counter weight up and down, which is formed at the center in the left-right direction of the counter weight as a storage space partitioned by the filler, and the weight moving device storage space Left and right hydraulic device storage spaces for storing hydraulic devices such as accumulators, and left and right hollow tubes communicating with the left and right hydraulic device storage spaces through the filling. The counterweight in the working machine according to claim 4, wherein hydraulic pipes for connecting the hydraulic devices stored in the hydraulic device storage space are arranged.

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