JP2022149633A - Multi-boom type work machine - Google Patents

Abstract

To provide a multi-boom type work machine improved in connection efficiency of adjacent booms.SOLUTION: A multi-boom type work machine has a machine body, a boom device (40), an arm device, an attachment, and a connection device (70). The connection device includes right and left first brackets (72b), upper and lower first pin insertion holes, right and left second bracket (74b), upper and lower second pin insertion holes, upper and lower connection pins (76e), upper and lower pins inserting/withdrawing device (78a), right and left upper centering members (80c, 80e) supporting the upper connection pin from an above side so that an axial line of the upper connection pin aligns with the hole axial line of the upper second pin insertion hole, and right and left support members (90e) provided to a first boom (42) so as to support the upper connection pin from a down side. Each of the right and left support members is arranged separating from the right and left first brackets more than the distance in the right and left direction of the right and left first brackets and the right and left upper centering members.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to a multi-boom working machine, and more particularly to a multi-boom working machine provided with a connecting device for connecting adjacent booms.

2. Description of the Related Art In general, when dismantling a structure having a large height above the ground, such as a high-rise building, a machine equipped with a working device for dismantling work is used. This working device for demolition work usually has a plurality of booms called a multi-boom, and an arm is attached to the tip side of the topmost boom of each boom, and a crusher, grapple, etc. are attached to the work implement.

Two adjacent booms of the multi-boom are connected to each other by inserting a connecting pin through a pin insertion hole provided in one boom and a pin insertion hole provided in the other boom. (For example, Patent Document 1).

US Pat. No. 6,300,002 describes a two-member coupling device for coupling a patch boom to a lower boom pivotally mounted on an upper swing structure. Specifically, the two-member connecting device described in Patent Document 1 engages an engagement groove of an upper centering member provided on a joint boom with an upper connecting pin protruding from a bracket provided on a lower boom, As a result, the axis of the upper connecting pin is aligned with the axis of the pin insertion hole provided in the joint boom. By inserting the connecting pin into the pin insertion hole of the connecting boom in a state in which both axes are aligned in this way, the connection between the lower boom and the connecting boom is completed.

Japanese Patent Application Laid-Open No. 2010-230113

By the way, when connecting the lower boom and the connecting boom using the two-member connecting device described in Patent Document 1, the centering work to match the axis of the upper connecting pin with the hole axis of the pin insertion hole of the connecting boom is performed. manual operation by the operator. In this case, the operator engages the engaging groove of the upper centering member and the upper connecting pin with each other while slightly manipulating either one of the lower boom and the connecting boom. Therefore, there is a possibility that the upper connecting pin and the upper centering member come into strong contact with each other during the centering operation.

When the upper connecting pin and the upper centering member strongly contact each other, the axis of the upper connecting pin cannot be aligned with the axis of the pin insertion hole of the connecting boom, and the upper connecting pin is inserted into the pin insertion hole of the connecting boom. It will take a lot of time to work. As a result, there is a risk that the efficiency of connecting the lower boom and the joint boom will be reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and an object of the present invention is to provide a multi-boom work machine that improves the efficiency of connecting work between adjacent booms.

To achieve the above object, a multi-boom work machine of the present invention includes a machine body, a first boom rotatably attached to the machine body, and a second boom attached to the first boom. a boom device, an arm device rotatably attached to the boom device, an attachment attached to the arm device for performing work, and a connecting device for connecting the first boom and the second boom. , wherein the connecting device includes left and right first brackets provided on the first boom facing each other in the left and right direction, and upper and lower first brackets provided on the left and right first brackets, respectively, with a space therebetween in the vertical direction. a pin insertion hole; left and right second brackets provided on the second boom so as to face the left and right first brackets; 2-pin insertion holes, upper and lower connection pins respectively inserted through the upper and lower first pin insertion holes and the upper and lower second pin insertion holes, and the upper and lower connection pins disposed between the left and right first brackets. an upper and lower connecting pin inserting and removing device configured to insert and remove the upper and lower connecting pins into and from the upper and lower second insertion holes in a state in which the pins are inserted through the upper and lower first insertion holes; The second boom is provided so as to face the left and right second brackets with the first bracket therebetween, and the axis of the upper connecting pin is aligned with the axis of the second upper pin insertion hole. In the multi-boom work machine including left and right upper centering members that support the upper connection pin from above, the connection device supports the upper connection pin from below. Each of the left and right support members is equal to or greater than the distance in the left and right direction between the left and right first brackets and the left and right upper centering members. It is characterized in that it is arranged away from the bracket.

According to the multi-boom work machine of the present invention, the connecting device includes left and right supporting members arranged on the first boom so as to support the upper connecting pin from below. The left and right support members are arranged apart from the left and right first brackets by a distance in the left and right direction between the left and right first brackets and the left and right upper centering members. For this reason, during the centering operation for matching the axis of the upper connecting pin with the hole axis of the second upper pin insertion hole, the upper connecting pin is supported by the upper centering member on the upper side and supported by the supporting member on the lower side. Supported by Therefore, even if the operator manually performs the centering work for aligning the axis of the upper connecting pin with the hole axis of the upper second insertion hole and the upper connecting pin strongly contacts the upper centering member, the upper Since the vertical position of the upper connecting pin is maintained by the centering member and the supporting member, deviation between the axis of the upper connecting pin and the hole axis of the upper second pin insertion hole can be suppressed. In this way, the operation of inserting the upper connecting pin into the upper second pin insertion hole can be efficiently performed, and a multi-boom work machine is provided that improves the efficiency of the connecting operation of the first boom and the second boom. can do.

1 is a side view schematically showing the overall configuration of a multi-boom working machine according to an embodiment of the present invention, showing a plurality of working positions of the working device; FIG. FIG. 2 is a side view schematically showing the work device of the multi-boom work machine of FIG. 1, showing a state in which an attachment is removed; FIG. 3 is a partially enlarged view of the working device of FIG. 2 as viewed in the direction of arrow A, showing a connecting portion between a lower boom and an upper boom; FIG. 4 is a perspective view for explaining the connecting portion shown in FIG. 3 as viewed from the upper boom side to the lower boom side, with the upper boom being partially cut away. FIG. 2 is a perspective view showing a lower boom and a coupling device provided on the lower boom of the working device shown in FIG. 1; FIG. 3 is a view for explaining a connecting operation of a lower boom and an upper boom in the working device of the multi-boom work machine shown in FIG. 1;

An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a multi-boom work machine having two booms and two arms will be described as an example. However, the multi-boom work machine of the present invention is not limited to this, and may have three booms, for example.

FIG. 1 is a side view schematically showing the overall configuration of a multi-boom work machine 1 (hereinafter also referred to as work machine 1) according to an embodiment of the present invention, in which a plurality of work positions of a work device 30 are shown. It is FIG. 2 is a side view schematically showing the work device 30 of the work machine 1 of FIG. 1, showing a state in which the attachment 60 is removed. FIG. 3 is a partially enlarged view of the working device 30 of FIG. 2 as viewed in the direction of arrow A, and shows the connecting portion between the lower boom 42 and the upper boom 44. As shown in FIG. FIG. 4 is a perspective view for explaining the connecting portion shown in FIG. 3 as viewed from the upper boom 44 side to the lower boom 42 side, and shows the upper boom 44 partially broken away. FIG. 5 is a perspective view showing the lower boom 42 and the coupling device 70 provided on the lower boom 42 of the working device 30 shown in FIG. 6A and 6B are diagrams for explaining the operation of connecting the lower boom 42 and the upper boom 44 in the working device 30 of the working machine 1 shown in FIG.

For convenience of explanation, "front", "rear", "left", and "right" as seen from the operator in the operator's cab 21 are defined based on the orientation of the work implement 1 shown in FIG. Define "top" and "bottom". That is, the arrows "front" and "rear" shown in each figure indicate the front-rear direction of the working machine 1 shown in FIG. 1, and the arrows "left" and "right" indicate the width of the working machine 1 shown in FIG. The arrows "up" and "down" indicate the vertical direction of the work implement 1. As shown in FIG.

As shown in FIG. 1, the multi-boom work machine 1 includes a lower traveling body 10, an upper revolving body (body) 20 arranged on the lower traveling body 10, and attached to the upper revolving body 20 to perform demolition work. A work device 30 for performing the work and a connecting device 70 are provided. The working machine 1 is preferably used for demolishing a structure having a large height above the ground, such as a high-rise building such as a building.

The lower traveling body 10 is a so-called crawler-type traveling device that supports the upper revolving body 20 so that the working machine 1 can travel.

The upper revolving body 20 is attached to the lower traveling body 10 so as to be rotatable about a revolving shaft (vertical axis). A driver's cab 21 for an operator to operate the work implement 1 is provided on the front and left side of the upper revolving body 20 . The operator's cab 21 is a cockpit in which an operator rides and operates the working machine 1 , such as driving the lower traveling body 10 and operating the working device 30 . A counterweight is provided on the rear side of the upper swing body 20 to ensure weight balance. A machine room is provided between the cab 21 and the counterweight. A diesel engine is arranged in the machine room, and the engine functions as a drive source for driving a hydraulic pump (not shown) that supplies pressure oil. The pressure oil discharged from the hydraulic pump is supplied to a travel motor provided on the lower travel body 10 and a swing motor provided on the upper swing body 20 (both not shown). As a result, the work machine 1 can be self-propelled by the lower traveling body 10 , and the upper revolving body 20 can rotate about the revolving shaft together with the work device 30 .

As shown in FIG. 1, the work device 30 includes a boom device 40 attached to the upper revolving body 20 so as to be able to rotate in the vertical direction, and an arm device attached to the tip of the boom device 40 so as to be able to rotate in the vertical direction. 50 and an attachment 60 attached to the tip of the arm device 50 for dismantling work.

The boom device 40 includes a lower boom 42 (first boom) rotatably attached to the upper swing body 20 and an upper boom 44 (second boom) attached to the lower boom 42. . The upper boom 44 may be attached to the lower boom 42 so as not to be relatively rotatable, or may be attached to the lower boom 42 so as to be vertically rotatable. The boom device 40 includes a lower boom cylinder 42a configured to vertically rotate a lower boom 42 with respect to the upper swing body 20 (Fig. 1).

As shown in FIGS. 1 and 2, the arm device 50 includes a middle arm 52 rotatably attached to the tip of the upper boom 44 and an arm 54 rotatably attached to the middle arm 52. consists of The arm device 50 also includes a middle arm cylinder 52a configured to vertically rotate the middle arm 52 with respect to the upper boom 44, and a configuration configured to vertically rotate the arm 54 with respect to the middle arm 52. and an arm cylinder 54a. The attachment 60 is, for example, a crusher used to dismantle a structure, and includes an attachment cylinder 60a for driving the attachment 60. As shown in FIG.

A part of the pressure oil discharged from the hydraulic pump is also supplied to the lower boom cylinder 42a, the middle arm cylinder 52a, the arm cylinder 54a and the attachment cylinder 60a. As a result, the boom device 40, the arm device 50, and the attachment 60 are driven in accordance with the degree of pressure oil supply, that is, the hydraulic pressure.

As shown in FIGS. 3 to 5, the connecting device 70 connects the lower boom 42 and the upper boom 44, and includes a lower boom side connecting portion 72, an upper boom side connecting portion 74, a connecting pin 76, It includes a connecting pin inserting/removing device 78 , a centering member 80 , and a support member 90 .

As shown in FIGS. 3 and 5, the lower boom side connecting portion 72 includes a pair of right first brackets 72a (right first brackets) and a pair of left first It is configured including a bracket 72b (left first bracket). The pair of right first brackets 72a and the pair of left first brackets 72b are each formed of two steel plate members that face each other in the left-right direction at a constant interval. It extends vertically over the corner. The pair of right first brackets 72a are fixed to the right side of the front end of the lower boom 42 by welding or the like. The pair of left first brackets 72b are fixed to the left side of the front end of the lower boom 42 by welding or the like. A right second bracket 74a (right second bracket) is arranged between the pair of right first brackets 72a, and a left second bracket 74b is arranged between the pair of left first brackets 72b. (Second left bracket) is arranged.

The lower boom side connecting portion 72 includes a pair of upper right first pin insertion holes 72c (upper first pin insertion holes) and a pair of lower right first pin insertion holes 72c (upper first pin insertion holes) which are vertically spaced apart in a pair of right first brackets 72a. A pair of holes 72d (lower first pin insertion holes) and a pair of upper left first pin insertion holes 72e (upper first pin insertion holes) and a pair of lower left pin insertion holes 72e (upper first pin insertion holes) and a pair of upper left first pin insertion holes 72e (upper first pin insertion holes) provided in a pair of left first brackets 72b with a vertical separation. 1 pin insertion hole 72f (lower first pin insertion hole). A pair of upper right first pin insertion holes 72c and a pair of lower right first pin insertion holes 72d are formed in the upper end side and lower end side of the pair of right first brackets 72a, respectively. An upper right connecting pin 76c (upper connecting pin) and a lower right connecting pin 76d (lower connecting pin) can be inserted into and removed from the pair of upper right first pin insertion holes 72c and the pair of lower right first pin insertion holes 72d, respectively. It is configured to be inserted into the A pair of upper left first pin insertion holes 72e and a pair of left lower first pin insertion holes 72f are formed in the upper end side and the lower end side of the pair of left first brackets 72b, respectively. An upper left connecting pin 76e (upper connecting pin) and a lower left connecting pin (lower connecting pin) (not shown) can be inserted into and removed from the pair of upper left first pin insertion holes 72e and the pair of left lower first pin insertion holes 72f, respectively. It is configured to be inserted. Here, the pair of upper right first pin insertion holes 72c and the pair of upper left first pin insertion holes 72e are formed so as to extend in the left-right direction so as to be arranged on the same hole axis. Also, the pair of lower right first pin insertion holes 72d and the pair of lower left first pin insertion holes 72f are formed to extend in the left-right direction so as to be arranged on the same hole axis.

As shown in FIG. 3, the upper boom side connecting portion 74 includes a right second bracket 74a (right second bracket) provided on the upper boom 44 so as to face a pair of right first brackets 72a and a pair of left first brackets 74a. It includes a left second bracket 74b (left second bracket) provided on the upper boom 44 so as to face the first bracket 72b. The right second bracket 74a and the left second bracket 74b are each formed of a single steel plate member, and extend vertically from the upper corner to the lower corner on the rear side of the upper boom 44. . The right second bracket 74a is fixed to the right side of the rear end of the upper boom 44 by welding or the like. The right second bracket 74a is disposed between the pair of right first brackets 72a and configured to face the pair of right first brackets 72a in the left-right direction. The left second bracket 74b is fixed to the left side of the rear end of the upper boom 44 by welding or the like. The left second bracket 74b is disposed between the pair of left first brackets 72b and configured to face the pair of left first brackets 72b in the left-right direction.

The upper boom side connecting portion 74 includes an upper right second pin insertion hole and a lower right second pin insertion hole (both not shown) provided vertically spaced apart in the right second bracket 74a, and a left second bracket 74b. It includes an upper left second pin insertion hole and a lower left second pin insertion hole (both not shown) which are vertically spaced apart from each other. The upper right second pin insertion hole and the lower right second pin insertion hole are formed in the upper end side and the lower end side of the right second bracket 74a, respectively. Further, the upper left second pin insertion hole and the left lower second pin insertion hole are formed in the upper end side and the lower end side of the left second bracket 74b, respectively. Here, the upper right second pin insertion hole and the upper left second pin insertion hole are arranged on the same hole axis as the pair of upper right first pin insertion holes 72c and the pair of upper left first pin insertion holes 72e. It is formed extending in the direction. Also, the lower right second pin insertion hole and the lower left second pin insertion hole are arranged on the same hole axis as the pair of lower right first pin insertion holes 72d and the pair of lower left first pin insertion holes 72f. It is formed extending in the left-right direction.

As shown in FIGS. 4 and 5, the connecting pins 76 include a pair of upper right connecting pins 76c (upper connecting pins) inserted through a pair of upper right first pin insertion holes 72c and upper right second pin insertion holes, and a pair of lower right A lower right connecting pin 76d (lower connecting pin) inserted through the first pin insertion hole 72d and the second lower right pin insertion hole, and a pair of upper left first pin insertion hole 72e and upper left second pin insertion hole are inserted. It includes an upper left connecting pin 76e (upper connecting pin) and a lower left connecting pin (not shown) inserted through a pair of lower left first pin insertion hole 72f and second lower left pin insertion hole. The upper right connecting pin 76c, the lower right connecting pin 76d, the upper left connecting pin 76e, and the lower left connecting pin are formed in a cylindrical shape. The upper right connecting pin 76c is inserted into and removed from the upper right second pin insertion hole by moving in the left-right direction. Similarly, the lower right connecting pin 76d moves laterally to be inserted into or removed from the lower right second pin insertion hole, and the left upper connecting pin 76e moves laterally to fit into the upper left second pin insertion hole. The lower left connecting pin is inserted into and removed from the second lower left pin insertion hole by moving in the left-right direction.

As shown in FIGS. 3 to 5, the connecting pin inserting/removing device 78 comprises an upper connecting pin inserting/removing device 78a and a lower connecting pin inserting/removing device 78b. The upper connecting pin inserting/removing device 78a and the lower connecting pin inserting/removing device 78b are respectively arranged between the pair of right first brackets 72a and the pair of left first brackets 72b in the left-right direction. Then, the upper connecting pin inserting/removing device 78a moves the upper right connecting pin 76c to the upper right second pin in a state in which the upper right connecting pin 76c is inserted into the left (inner side in the width direction) insertion hole of the pair of upper right first pin insertion holes 72c. The upper left connecting pin 76e is inserted into and removed from the insertion hole, and the upper left connecting pin 76e is inserted into the upper left second pin insertion hole in a state in which the upper left connecting pin 76e is inserted into the right (widthwise inner) insertion hole of the pair of upper left first pin insertion holes 72e. It is configured to be inserted into and removed from the hole. In addition, the lower connecting pin inserting/removing device 78b moves the lower right connecting pin 76d to the right while the lower right connecting pin 76d is inserted into the left (inner side in the width direction) insertion hole of the pair of lower right first pin insertion holes 72d. With the lower left connecting pin inserted into and removed from the second lower pin insertion hole, and the lower left connecting pin being inserted into the right (widthwise inner) insertion hole of the pair of first lower left pin insertion holes 72f, the lower left connecting pin is inserted into the second lower left pin insertion hole. It is configured to be inserted into and removed from the pin insertion hole.

The upper connecting pin extracting/inserting device 78a and the lower connecting pin extracting/inserting device 78b include an upper hydraulic cylinder 78h and a lower hydraulic cylinder 78i which reciprocate by supplying and discharging pressure oil from a hydraulic source, and one end of the upper hydraulic cylinder 78h and the lower hydraulic cylinder. 78i and a lever rotatably connected with a pin. In addition, in FIG. 4, the upper left lever 78e is shown as the said lever. The upper left lever 78e has one end rotatably coupled to the upper hydraulic cylinder 78h and the other end rotatably coupled to the upper left connecting pin 76e. Since the upper right lever, the lower right lever, and the lower left lever have a structure corresponding to the upper left lever 78e, detailed description thereof will be omitted. The upper connecting pin inserting/removing device 78a and the lower connecting pin inserting/removing device 78b are configured to move the connecting pin 76 in the horizontal direction using an upper hydraulic cylinder 78h and a lower hydraulic cylinder 78i. Since the configuration of the connecting pin inserting/removing device 78 is well known, a detailed description thereof will be omitted.

As shown in FIGS. 3 and 4, the centering member 80 is an upper right centering member 80c (upper centering member 80c) provided on the upper boom 44 so as to face the right second bracket 74a across the pair of right first brackets 72a. and an upper left centering member 80e (upper centering member) provided on the upper boom 44 so as to face the left second bracket 74b across the pair of left first brackets 72b. ing. Specifically, when the right second bracket 74a is arranged between the pair of right first brackets 72a, the upper right centering member 80c is arranged to extend to the right side of the pair of right first brackets 72a with the left bracket interposed therebetween. It is arranged so as to face the second bracket 74a. Further, when the left second bracket 74b is arranged between the pair of left first brackets 72b, the upper left centering member 80e is configured to extend to the left second bracket 74b with the right bracket of the pair of left first brackets 72b interposed therebetween. are placed facing each other. As shown in FIG. 4, the upper right centering member 80c and the upper left centering member 80e face the right second bracket 74a and the left second bracket 74b in parallel, respectively, and extend from the upper corner of the upper boom 44 to the upper right second bracket. It extends to a position corresponding to the pin insertion hole and the upper left second pin insertion hole.

The upper right centering member 80c supports the upper right connecting pin 76c from above so that the axis of the upper right connecting pin 76c is aligned with the hole axis of the upper right second pin insertion hole. The upper left connecting pin 76e is supported from above so that the axis of the pin 76e coincides with the hole axis of the upper left second pin insertion hole. The upper right centering member 80c and the upper left centering member 80e are each formed in a generally triangular shape using a plate body, and are fixed to the upper corners of the upper boom 44 by welding or the like. The upper right centering member 80c and the upper left centering member 80e each include an engagement groove portion recessed upward so as to support the upper right connecting pin 76c and the upper left connecting pin 76e from above. Note that FIG. 4 shows only the engagement groove portion 80g of the upper left centering member 80e. The engaging groove portion 80g is formed in an arc shape having a radius of curvature substantially equal to that of the upper left second pin insertion hole, and engages with the upper left connecting pin 76e from above. Since the engaging groove portion of the upper right centering member 80c has the same configuration as the engaging groove portion 80g of the upper left centering member 80e, detailed description thereof will be omitted.

The centering members 80 include a lower right centering member (not shown) provided on the upper boom 44 so as to face the right second bracket 74a across the pair of right first brackets 72a, and a pair of left side brackets 72a. It further includes a left lower centering member (not shown) provided on the upper boom 44 so as to face the left second bracket 74b across the first bracket 72b. The lower right centering member supports the lower right connecting pin 76d so that the axis of the lower right connecting pin 76d coincides with the hole axis of the lower right second pin insertion hole, and the lower left centering member supports the lower left connecting pin. The lower left connecting pin is supported so that the axis of the pin coincides with the hole axis of the lower left second pin insertion hole. The lower right centering member and the lower left centering member face the second right bracket 74a and the second left bracket 74b in parallel, respectively, and extend from the lower corner of the upper boom 44 to the lower right second pin insertion hole and the lower left pin insertion hole. extends to a position corresponding to Each of the lower right centering member and the lower left centering member is formed in a generally triangular shape as a whole using a plate body, and is fixed to the lower corner of the upper boom 44 by welding or the like. Since the configuration of the centering member 80 is well known, detailed description thereof will be omitted.

As shown in FIGS. 3 to 5, the support member 90 supports the right support member 90c provided on the lower boom 42 so as to support the upper right connection pin 76c from below and the upper left connection pin 76e from below. and a left support member 90e provided on the lower boom 42 as described above. The right support member 90c is arranged away from the right first bracket 72a by a distance W1 or more in the left-right direction between the left (inner side in the width direction) bracket and the upper right centering member 80c. Specifically, the right support member 90c is provided at a position facing the upper right centering member 80c with the upper right connecting pin 76c interposed therebetween. Similarly, the left support member 90e is arranged away from the left first bracket 72b by a distance W2 or more in the left-right direction between the right (inner side in the width direction) bracket of the pair of left first brackets 72b and the upper left centering member 80e. . Specifically, the left support member 90e is provided at a position facing the upper left centering member 80e across the upper left connecting pin 76e. The right support member 90c and the left support member 90e each have a width that is the same as or substantially the same as the width of the upper right centering member 80c and the upper left centering member 80e, or wider than the width of the upper right centering member 80c and the upper left centering member 80e. is formed by The right support member 90c and the left support member 90e are symmetrically arranged corresponding to the upper right connecting pin 76c and the upper left connecting pin 76e, respectively.

The right support member 90c is arranged on the left side (inward in the width direction) of the left bracket of the pair of right first brackets 72a when the right second bracket 74a is arranged between the pair of right first brackets 72a. there is Further, the left support member 90e is arranged on the right side (inward in the width direction) of the right bracket of the pair of left first brackets 72b when the left second bracket 74b is arranged between the pair of left first brackets 72b. It is The right side support member 90c and the left side support member 90e are each formed using a plate body, face the pair of right side first brackets 72a and the pair of left side first brackets 72b in parallel, and are attached to the upper right second pin of the lower boom . It is fixed by welding or the like at a position corresponding to the insertion hole and the upper left second pin insertion hole. The means for fixing the right support member 90c and the left support member 90e to the lower boom 42 is not limited to welding, and may be fastening using bolts and nuts, for example. The right support member 90c and the left support member 90e respectively include engaging recesses that are recessed downward to support the upper right connecting pin 76c and the upper left connecting pin 76e from below. Note that FIG. 4 shows only the engaging recess 90g of the left support member 90e. The engaging recess 90g is formed in an arc shape having a radius of curvature substantially equal to that of the upper left second pin insertion hole, and engages the upper left connecting pin 76e from below. Since the engagement recess of the right support member 90c has the same configuration as the engagement recess 90g of the left support member 90e, detailed description thereof will be omitted.

Next, a connection operation for attaching the upper boom 44 to the distal end side of the lower boom 42 constituting the working device 30 using the connecting device 70 will be described.

First, as shown in FIG. 2, a stand 95 is placed on the ground G. As shown in FIG. The upper boom 44, the middle arm 52, the arm 54, and the attachment 60 among the parts constituting the working device 30 are assembled in advance, and this assembly, that is, the working device 30 except for the lower boom 42, is deposited on the stand 95. (However, FIG. 2 shows the state after the lower boom 42 and the upper boom 44 are connected using the connecting device 70). On the other hand, the lower boom 42 is attached to the upper swing body 20 in advance. When the operator in the cab 21 moves the lower boom 42, the lower boom 42 and the upper boom 44 are connected. More specifically, as shown in FIG. 6, the operator should make sure that the upper right connecting pin 76c and the upper left connecting pin 76e are engaged with the engaging groove portion 80g of the upper right centering member 80c and the upper left centering member 80e, respectively. , the lower boom 42 is operated. Note that FIG. 6 shows the upper right connecting pin 76c and related components, and the upper left connecting pin 76e and related components are omitted. At this time, the upper right connecting pin 76c is held in the engaging recess of the right supporting member 90c from below, and the upper left connecting pin 76e is held in the engaging recess 90g of the left supporting member 90e from below. That is, the upper right connecting pin 76c and the upper left connecting pin 76e are held vertically by the upper right centering member 80c and the upper left centering member 80e, and the right support member 90c and the left support member 90e, respectively. As a result, the axis of the upper right connecting pin 76c coincides with the hole axis of the upper right second pin insertion hole, and the axis of the upper left connecting pin 76e coincides with the hole axis of the upper left second pin insertion hole. In this state, the upper right connecting pin 76c and the upper left connecting pin 76e are inserted into the pair of upper right first pin insertion holes 72c and the pair of upper left first pin insertion holes 72e and the upper right first pin insertion holes 72c and 72e, respectively. It is made to pass through the 2 pin insertion hole and the upper left second pin insertion hole. The operator then operates the lower boom 42 until the lower right connecting pin 76d and the lower left connecting pin are held by the lower right centering member and the lower left centering member, respectively. As a result, the hole axes of the lower right second pin insertion hole and the lower left second pin insertion hole coincide with the hole axes of the pair of lower right first pin insertion holes 72d and the pair of lower left first pin insertion holes 72f. Finally, using the lower connecting pin inserting/removing device 78b, the lower right connecting pin 76d and the lower left connecting pin are moved to the pair of lower right first pin insertion holes 72d and the pair of lower left first pin insertion holes 72f, respectively, and the lower right connecting pin. It is made to pass through the second pin insertion hole and the lower left second pin insertion hole. This completes the connection work for attaching the upper boom 44 to the tip side of the lower boom 42 .

Next, functions and effects of the multi-boom work machine 1 according to the first embodiment of the present invention will be described. According to the work machine 1 according to the first embodiment of the present invention, the connecting device 70 includes a right supporting member provided on the lower boom 42 so as to support the upper right connecting pin 76c and the upper left connecting pin 76e from below. 90c and a left support member 90e. The right support member 90c is arranged away from the right first bracket 72a by a distance W1 or more in the left-right direction between the left (inner side in the width direction) bracket and the upper right centering member 80c. Specifically, the right support member 90c is provided at a position facing the upper right centering member 80c with the upper right connecting pin 76c interposed therebetween. The left supporting member 90e is arranged away from the left first bracket 72b by a distance W2 or more between the right (widthwise inner) bracket and the upper left centering member 80e. Specifically, the left support member 90e is provided at a position facing the upper left centering member 80e across the upper left connecting pin 76e.

Therefore, during the centering operation for matching the axes of the upper right connecting pin 76c and the upper left connecting pin 76e with the hole axes of the upper right second pin insertion hole and the upper left second pin insertion hole, the upper right connecting pin 76c and the upper left connecting pin 76e do not move. They are respectively supported on the upper side by the upper right centering member 80c and the upper left centering member 80e, and on the lower side by the right supporting member 90c and the left supporting member 90e. Therefore, in the centering operation, the upper right connecting pin 76c and the upper left connecting pin 76e are in strong contact with the upper right centering member 80c and the upper left centering member 80e, respectively. Since the upper right connecting pin 76c and the upper left connecting pin 76e are maintained in the vertical position by the upper right centering member 80c, the upper left centering member 80e, the right side supporting member 90c, and the left side supporting member 90e, even when the upper right It is possible to suppress the deviation between the axes of the connecting pin 76c and the upper left connecting pin 76e and the hole axes of the upper right second pin insertion hole and the upper left second pin insertion hole. In this manner, the upper right connecting pin 76c and the upper left connecting pin 76e can be smoothly inserted into the upper right second pin insertion hole and the upper left second pin insertion hole, and the work can be efficiently performed. It is possible to provide the multi-boom work machine 1 that improves the efficiency of the work for connecting the boom 42 and the upper boom 44 .

Although the preferred embodiments of the present invention have been described above, aspects of the present invention are not limited to the above embodiments. For example, in the above-described embodiment, when the right support member 90c is provided at a position facing the upper right centering member 80c with the upper right connecting pin 76c interposed therebetween, the left support member 90e is positioned at the upper left corner with the upper left connecting pin 76e interposed therebetween. The case where it is provided at a position facing the centering member 80e has been described. However, the arrangement of the right support member 90c and the left support member 90e is not limited to this. For example, the right support member 90c may be arranged on the left side (inward in the width direction) of the right upper centering member 80c. That is, the right upper centering member 80c may be arranged between the left bracket of the pair of right first brackets 72a and the right support member 90c. Further, the left support member 90e may be arranged on the right side (inward in the width direction) of the upper left centering member 80e. That is, the upper left centering member 80e may be arranged between the right bracket of the pair of left first brackets 72b and the upper left support member 90e.

Moreover, the present invention is not limited to the working machine 1 according to the above-described embodiment, and includes all aspects included in the concept of the present invention and the scope of claims. Moreover, each configuration may be selectively combined as appropriate so as to achieve the above-described problems and effects. For example, the shape, material, arrangement, size, etc. of each component in the above embodiments may be changed as appropriate according to specific aspects of the present invention.

1 Multi-boom type work machine 20 Upper revolving body (fuselage)
40 boom device 42 lower boom (first boom)
44 upper boom (second boom)
50 arm device 60 attachment 70 connecting device 72a pair of right first brackets (right first brackets)
72b A pair of left first brackets (left first brackets)
72c Pair of upper right first pin insertion holes (upper first pin insertion holes)
72d A pair of lower right first pin insertion holes (lower first pin insertion holes)
72e Pair of upper left first pin insertion holes (upper first pin insertion holes)
72f A pair of lower left first pin insertion holes (lower first pin insertion holes)
74a right second bracket (right second bracket)
74b left second bracket (left second bracket)
76c upper right connecting pin (upper connecting pin)
76d lower right connecting pin (lower connecting pin)
76e Upper left connecting pin (upper connecting pin)
78a Upper connecting pin inserting/removing device 78b Lower connecting pin inserting/removing device 80c Upper right centering member (upper centering member)
80e upper left centering member (upper centering member)
90c right supporting member (right supporting member)
90e left support member (left support member)
W1, W2 distance

Claims (2)

Airframe and
a boom device including a first boom rotatably attached to the airframe and a second boom attached to the first boom;
an arm device rotatably attached to the boom device;
an attachment that is attached to the arm device and performs work;
a connecting device that connects the first boom and the second boom,
The connecting device is
Left and right first brackets provided on the first boom facing each other in the left-right direction;
upper and lower first pin insertion holes vertically spaced apart from each other in the left and right first brackets;
Left and right second brackets provided on the second boom so as to face the left and right first brackets;
upper and lower second pin insertion holes vertically spaced apart from each other in the left and right second brackets;
upper and lower connecting pins respectively inserted through the upper and lower first pin insertion holes and the upper and lower second pin insertion holes;
The upper and lower connecting pins are arranged between the left and right first brackets and are inserted into and removed from the upper and lower second through holes in a state in which the upper and lower connecting pins are inserted into the upper and lower first through holes. an upper and lower connecting pin inserting/removing device configured as follows;
It is provided on the second boom so as to face the left and right second brackets with the left and right first brackets interposed therebetween, and the axis of the upper connecting pin is aligned with the hole axis of the upper second pin insertion hole. and left and right upper centering members that support the upper connecting pin from above as follows:
The connecting device further includes left and right support members provided on the first boom so as to support the upper connection pin from below, and the left and right support members are respectively connected to the left and right first brackets. and the left and right upper centering members are separated from the left and right first brackets by a distance in the left and right direction or more. 2. The multi-boom working machine according to claim 1, wherein the left and right support members are provided at positions facing the left and right upper centering members with the upper connecting pin interposed therebetween.

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