JP2011174287A - Working machine of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working machine of a construction machine which is simple in a boom attaching/detaching structure of the working machine to be replaced corresponding to different working contents, has no projection, and has no risk of breakage. <P>SOLUTION: In the working machine of a construction machine body, a boom includes a common boom 6 having a base end supported by a construction machine body and a connection side end at a side opposite to the base send, and an upper boom 7 connected to the connection side end 6c of the common boom 6 and provided with an attachment. A plurality of connection pin insertion holes 6e, 6f for the connection of the upper boom are provided, and also a boss 15 inserting a pin 11a from the rod tip of a boom cylinder 11 therethrough is also provided to the connection side end 6c of the common boom 6. A plurality of connection pin insertion bosses 7e, 7f are provided at the connection side end 7a of the upper boom 7 at a position opposite to the plurality of connection pin insertion holes 6e, 6f when connected to the common boom 6, and a recess 7b locked with the boss 15 is formed facing downward. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a work machine for a construction machine configured to be able to replace a work machine according to work contents.

  2. Description of the Related Art Conventionally, construction machines that perform different operations by exchanging work machines between different work contents, for example, excavation work such as earth and sand and demolition work of a building are known.

  In this type of construction machine, as shown in FIG. 5, an upper turning body 51 is turnably mounted on a lower traveling body 50, and when excavation work is performed, the upper turning body 51 on the driver seat 52 side. Is provided with an excavating work machine 53.

  The excavating work machine 53 includes a boom 54 that is provided at the front of the upper swing body 51 and can be swung up and down, an arm 55 that is connected to the tip of the boom 54, and a tip of the arm 55. And a bucket 56 connected to the main body.

  The boom 54 is composed of a common boom 54a that is commonly used for excavation and dismantling and an upper boom 54b that can be replaced depending on the work contents. Two connecting pins 57 are provided at the connecting portion between the booms 54a and 54b. It is integrated by inserting.

  In the figure, reference numeral 54c is a boom cylinder, 55a is an arm cylinder, and 56a is a bucket cylinder.

  FIG. 6 shows a state where the upper boom 54b is separated from the common boom 54a.

  A pair of connecting brackets 58 and 58 (shown only on the front side) are provided at the distal end of the common boom 54a as the connecting portion, and are connected to the connecting side end of each bracket 58 and 58. Pin insertion holes 58a and 58a are arranged vertically. Further, hooks 59 and 59 (only the front side are shown) are projected from the brackets 58 and 58.

  On the other hand, engagement pins 60, 60 (only the front side is shown) that can engage with the hooks 59, 59 protrude in the left-right direction at the connection side end of the upper boom 54b, and further, the pin insertion hole 58a. , 58a can be connected to the bosses 61, 61.

  When connecting the upper boom 54b to the common boom 54a having the above configuration, first, the engaging pins 60, 60 on the upper boom 54b side are hooked on the hooks 59, 59 on the common boom 54a side. Next, by slightly lifting the common boom 54a, the upper boom 54b is slightly rotated downward with the engaging pins 60, 60 as fulcrums, and the pin insertion holes 58a, 58a of the common boom 54a and the bosses of the upper boom 54b Align with 61.

  In this state, the common boom 54a and the upper boom 54b are connected by inserting the connecting pin 57 (see FIG. 5) into the pin insertion holes 58a and 58a (see, for example, Patent Document 1).

JP 11-193542 A

  However, in the conventional attachment replacement work machine described above, it is necessary to provide dedicated brackets 58 and 58 having hooks 59 on the common boom 54a, so that the length of the common boom 54a is increased and the upper boom 54b is connected. There is a problem that the structure of the part becomes complicated and the weight increases.

  Further, the upper boom 54b must be provided with engaging pins 60, 60 for engaging with the hook 59 so as to protrude from side to side. Such protrusions avoid collisions caused by crushed pieces particularly during dismantling work. It will cause damage.

  In addition, when the above work machine is applied to an existing construction machine, the boom foot pin must be removed and the entire boom must be removed.Since such work is not realistic, it can only be applied to a newly manufactured construction machine. There is also a restriction that it cannot be applied.

  The present invention has been made in consideration of the problems in the conventional work machine as described above, and the boom attachment / detachment structure of the work machine to be exchanged according to different work contents is simple, and there is no projection so that it is damaged. It is an object of the present invention to provide a working machine for a construction machine that does not have a risk of being damaged.

The present invention is a working machine having a boom mounted on a construction machine body and undulating by a boom cylinder,
The boom includes a common boom having a base end supported by the construction machine main body and having a connection side end opposite to the base end, and an upper having an attachment connected to the connection side end of the common boom. Consists of a boom and
A plurality of connection pin insertion holes for connecting the upper boom are provided at the connection side end of the common boom, and a boss part through which a pin from the rod tip of the boom cylinder is passed is provided.
A plurality of connection pin insertion bosses are provided at the connection side end of the upper boom so as to face the plurality of connection pin insertion holes when connected to the common boom, and engage with the bosses. This is a construction machine working machine in which a recess is provided downward.

  In the present invention, the common boom means, for example, a boom used in common for both excavation work and dismantling work.

  On the other hand, the above-mentioned upper boom provided with an attachment means a boom with an attachment prepared for each different attachment, and the attachment is directly connected to the boom, and the attachment is connected to the boom via an arm. In addition, the attachment is connected to the boom via an arm, an intermediate boom, or the like. The attachment includes a bucket for excavation, a crushing device for dismantling, a breaker, a large split machine, and the like.

  In the present invention, the concave portion may be provided with a semicircular curved plate that engages with the outer wall of the body portion of the boss portion.

  In this invention, it is preferable to form the guide part which guides the boss | hub part of the said common boom to the said recessed part in the connection side edge part of the said upper boom.

  In the present invention, an overhang portion is extended from the upper portion of the connection side end portion of the upper boom toward the connection direction, and the first connection is arranged at the tip portion so as to face the first connection pin insertion hole. A pin insertion boss portion may be provided, and the second connection pin insertion boss portion may be provided at a lower portion of the upper boom connection side end portion so as to face the second connection pin insertion hole.

  According to the working machine of the present invention, the structure of the boom attaching / detaching part can be simplified for the working machine for using different attachments. Moreover, since it does not have a protrusion, it has the advantage that there is no possibility of damage even if it is used for dismantling work.

It is a side view which shows the whole construction machine with which the working machine for excavation concerning this invention was mounted | worn. It is a side view which shows the whole structure of the construction machine equipped with the working machine for dismantling concerning this invention. (a) is the top view which expanded and showed the structure of the common boom and the upper boom in the working machine which concerns on this invention, (b) is the side view. (a)-(d) is explanatory drawing which shows the attachment or detachment procedure of a common boom and an upper boom. It is a side view which shows the whole structure of the construction machine equipped with the working machine for the conventional attachment replacement | exchange. It is a side view which shows the working machine division | segmentation state of FIG.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

1 Construction Machine Provided with Excavation Work Machine FIG. 1 is a side view showing an overall configuration of a construction machine provided with an excavation work machine as a work machine for the construction machine according to the present invention.

  In FIG. 1, a construction machine 1 includes a lower traveling body 2 as a main body, an upper revolving body 3 that is turnably mounted on the lower traveling body 2, and an excavation provided on the driver seat 4 side of the upper revolving body 3. Mainly composed of the work machine 5.

  The excavating work machine 5 includes a boom 8 composed of a common boom (lower boom) 6 supported on the front side of the upper swing body 3 and an upper boom 7 connected to a connection side end of the common boom 6, and an upper The arm 9 is mainly composed of an arm 9 connected to the tip of the boom 7 and a bucket 10 as an attachment connected to the tip of the arm 9. In the figure, 11 is a boom cylinder, 12 is an arm cylinder, and 13 is a bucket cylinder.

  The common boom 6 can be swung up and down by expanding and contracting the boom cylinder 11, the arm 9 by expanding and contracting the arm cylinder 12, and the bucket 10 by expanding and contracting the bucket cylinder 13. It has become.

  The boom cylinders 11 are arranged on both the left and right sides of the common boom 6, and the tube base end portions of the boom cylinders 11 are connected to the frame front portion of the upper swing body 3 via boom foot pins 14. ing.

  Further, a boss portion 15 as a structure is conventionally provided at the distal end portion of the common boom 6 in a state of being erected on the left and right side plates of the common boom 6. Note that both ends of the pin 16 inserted into the boss portion 15 protrude from the side plate of the common boom 6 to the outside, and are connected to the rod tip portions of the boom cylinder 11.

2 Construction Machine for Demolition FIG. 2 is a side view showing an overall configuration of a construction machine provided with a dismantling work machine as a construction machine working machine according to the present invention. The same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  The dismantling work machine 18 includes a boom 20 composed of the common boom 6 having the above-described configuration and an upper boom 19 connected to the distal end portion of the common boom 6, and an intermediate boom 21 coupled to the distal end portion of the boom 20. And an arm 22 coupled to the distal end portion of the intermediate boom 21 and a crushing device 23 serving as an attachment coupled to the distal end portion of the arm 22.

  In the figure, reference numeral 24 denotes an intermediate boom cylinder for swinging the intermediate boom 21 in the vertical direction, 25 is an arm cylinder, and 26 is a bucket cylinder for swinging the crushing device 23 in the vertical direction. W indicates a wall surface to be dismantled by the crushing device 23.

3 Excavation Work Machine FIG. 3 is an enlarged view showing the configuration of the common boom 6 and the upper boom 7 of the excavation work machine 5 shown in FIG. 1, wherein FIG. 3 (a) is a plan view and FIG. ) Shows a side view.

  For convenience, the base end side of the excavating work machine 5 may be referred to as the rear and the front end side may be referred to as the front.

3.1 Common Boom In both drawings, a boss 6b into which a boom foot pin 14 (see FIG. 1) is inserted is provided at the base end 6a of the common boom 6. Further, a boss portion 15 is installed horizontally on the connection side end portion 6c with respect to the left and right side plates 6d, 6d of the common boom 6, and a pin 16 (see FIG. 1) is inserted into the boss portion 15. It has become.

  On the side surface of the common boom 6, a first connection pin insertion hole 6 e is formed above and behind the boss portion 15, and a second connection pin insertion hole 6 f is formed below the boss portion 15.

  The common boom 6 is formed in a rectangular tube shape by the upper plate 6g, the left and right side plates 6d and 6d, and the bottom plate 6h, but the upper plate 6g is cut out from the front end of the common boom 6 for the length L. Part S is formed. The opening S is provided to allow an overhang (described later) of the upper boom 7 to pass therethrough. After the upper boom 7 is connected, for example, for the purpose of preventing falling objects from entering during dismantling work. If the cover is attached, the opening S can be closed.

  The tip 6h 'of the bottom plate 6h extends to the vicinity of the second connection pin insertion hole 6f.

  In the figure, reference numeral 17 denotes a connection pin inserted into the first connection pin insertion hole 6e and the second connection pin insertion hole 6f.

3.2 Upper Boom A semicircular hooking portion 7b as a concave portion is formed on the connection side end portion 7a of the upper boom 7 downward, and the cross section of the hooking portion 7b is bent into a substantially semicircular shape. A curved plate 7c is attached. The inner diameter Ra of the curved plate 7c is set to a value slightly larger than the outer shape Rb of the boss portion 15. Thereby, the hook portion 7b can be hooked on the outer peripheral surface of the body portion of the boss portion 15, and in this state, the upper boom 7 can be swung in the direction of arrow A with the boss portion 15 as a support shaft. ing.

  Also, an overhang portion 7d protrudes rearward from the hook portion 7b, and a first connection pin insertion that can communicate with the first connection pin insertion hole 6e is provided at the rear end portion of the overhang portion 7d. A boss 7e is provided.

  A second connection pin insertion boss portion 7f that can communicate with the second connection pin insertion hole 6f is formed below the hook portion 7b and in front of the hook portion 7b. Further, the edge portion 7g connecting the second connecting pin insertion boss portion 7f and the hooking portion 7b with a curve functions as a guide portion for guiding the boss portion 15 to the hooking portion 7b. Yes.

  The dismantling work machine 18 is basically the same as the excavation work machine 5 described above, although the upper boom is longer than the upper boom of the excavation work machine. is there.

  In the figure, reference numerals 11 and 11 denote boom cylinders disposed on the left and right sides of the common boom 6, and 16 denotes a pin that is pivotally connected to each rod tip and the boss part 15 of the boom cylinders 11 and 11. ing.

  Hereinafter, a method for attaching and detaching the common boom and the upper boom will be described on behalf of the excavating work machine 5.

4 Procedure for Attaching / Detaching Common Boom and Upper Boom FIGS. 4A to 4D are explanatory views showing a procedure for connecting the common boom and the upper boom in the excavating work machine.

  It is assumed that the excavating work machine 5 is separated between the common boom 6 and the upper boom 7 and the upper boom 7 is placed on the gantry C.

4.1 Procedure for Connecting Common Boom and Upper Boom In FIG. 4A, the main body 30 of the construction machine is moved forward (in the direction of arrow B), so that the common boom 6 is placed below the connection side end 7a of the upper boom 7. The connection side end 6c is arranged.

  In FIG. 4B, the boom boom 11 is extended to lift the common boom 6 in the direction of arrow D. At this time, the boss portion 15 of the common boom 6 is raised while being in contact with the edge portion 7g (see FIG. 4A) as a guide portion.

  In FIG. 2C, after confirming that the hook 7b of the upper boom 7 is hooked on the boss 15 of the common boom 6, the boom cylinder 11 is further extended slightly. Thereby, the upper boom 7 is slightly rotated in the direction of arrow E with the boss portion 15 as a support shaft, and the first connection pin insertion boss portion 7e of the common boom 6 and the first connection pin insertion boss portion 7e of the upper boom 7 are rotated. Each center coincides, and at the same time, each center of the second connection pin insertion hole 6f of the common boom 6 and the second connection pin insertion boss part 7f of the upper boom 7 coincide (see FIG. 3B).

  In this state, the common boom 6 and the upper boom 7 are connected and integrated by inserting the connection pins 17 (see FIG. 3A) into the first connection pin insertion holes 6e and the second connection pin insertion holes 6f, respectively. It becomes.

  In FIG. 4D, the boom cylinder 11 is further extended to lift the boom 8 including the common boom 6 and the upper boom 7 from the mount C, and the mount C is removed.

  Moreover, the common boom 6 and the upper boom 7 can be separated by executing a procedure opposite to the procedure shown in FIGS.

  That is, in FIG.4 (d), the mount frame C is arrange | positioned under the boom 8, and the connection pin 17 is each extracted from the 1st connection pin insertion hole 6e and the 2nd connection pin insertion hole 6f, FIG.4 (c). 4, the boom 8 is lowered and placed on the gantry C, and the hook 7 b of the upper boom 7 is separated from the boss 15 of the common boom 6 as shown in FIG. If the common boom 6 is further lowered, the division of the common boom 6 and the upper boom 7 is completed.

DESCRIPTION OF SYMBOLS 1 Construction machine 2 Lower traveling body 3 Upper revolving body 4 Driver's seat 5 Excavator work machine 6 Common boom 6a Base end part 6b Boss part 6c Connection side end part 6d Side plate 6e First connection pin insertion hole 6f Second connection pin Insertion hole 6g Upper plate 6h Bottom plate 7 Upper boom 7a Connection side end portion 7b Hooking portion 7c Curved plate 7d Overhang portion 7e First connection pin insertion boss portion 7f Second connection pin insertion boss portion 7g Edge portion 8 Boom 9 Arm DESCRIPTION OF SYMBOLS 10 Bucket 11 Boom cylinder 12 Arm cylinder 13 Bucket cylinder 14 Boom foot pin 15 Boss part 16 Pin 17 Connection pin 19 Upper boom 20 Boom 21 Intermediate boom 22 Arm 23 Crushing device 24 Intermediate boom cylinder 25 Arm cylinder 26 Bucket cylinder

Claims (4)

In a work machine having a boom mounted on a construction machine body and undulating by a boom cylinder,
The boom includes a common boom having a base end supported by the construction machine main body and having a connection side end opposite to the base end, and an upper having an attachment connected to the connection side end of the common boom. Consists of a boom and
A plurality of connection pin insertion holes for connecting the upper boom are provided at the connection side end of the common boom, and a boss part through which a pin from the rod tip of the boom cylinder is passed is provided.
A plurality of connection pin insertion bosses are provided at the connection side end of the upper boom so as to face the plurality of connection pin insertion holes when connected to the common boom, and engage with the bosses. A working machine for a construction machine, wherein the concave portion is provided downward.   2. The construction machine according to claim 1, wherein the concave portion includes a curved plate having a semicircular cross section that engages with the outer wall of the body portion of the boss portion.   The work machine for a construction machine according to claim 1 or 2, wherein a guide portion for guiding the boss portion of the common boom to the concave portion is formed at a connection side end portion of the upper boom.   An overhang portion is extended from the upper portion of the connection side end portion of the upper boom toward the connection direction, and the first connection pin insertion boss portion is arranged at the tip portion so as to face the first connection pin insertion hole. 4. The second connection pin insertion boss portion is provided at a lower portion of the upper boom connection side end portion so as to face the second connection pin insertion hole. The working machine of the construction machine according to 1.