JP2010203149A - Attitude holding frame for super-long attachment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten an installation time while reducing a load to cylinders provided at a super-long attachment in an attitude holding frame for holding the super-long attachment. <P>SOLUTION: The attitude holding frame 2 for the super-long attachment 3 holds the super-long attachment 3 including a boom 7 mounted to a main boom of a hydraulic shovel, a relay boom 47, an arm 57 and cylinders 15, 19 connecting the relay boom 47 to the boom 7, in a folded state so that a tip part 57a of the arm 57 faces the base end side 7a of the boom 7. The attitude holding frame 2 includes a frame body 23 extended in the longitudinal direction of the boom and provided to surround the super-long attachment 3 from both right and left sides and the lower side; a base end side receiving member 39 supporting the base end side of the boom 7 by a rigid body; a tip side receiving member 41 supporting the tip side of the boom 7 by a rigid body in a position higher than the base end side receiving member 39; and a shock absorber 43 for elastically supporting the arm 57. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a state in which an ultralong attachment including a boom, a relay boom, and an arm attached to the boom via the relay boom is folded so that the distal end portion of the arm faces the base end side of the boom It is related with the attitude | position holding stand of the super-long attachment held by.

  Conventionally, an ultra-long attachment with a base end attached to the tip of the main boom of a construction machine and a hydraulic crusher etc. attached to the tip is known for dismantling high-rise buildings such as dismantling high-rise buildings. It has been.

  This super-long attachment is normally attached to a boom formed by adding a plurality of members such as an insert boom and a front boom, a relay boom attached to the tip of the boom, and the boom so as to be rotatable via the relay boom. An arm, a jib cylinder that is rotatably connected to the boom and the relay boom, and an arm cylinder that is rotatably connected to the relay boom and the arm are provided.

  The super-long attachment is driven so that the boom is driven by the boom cylinder, the relay boom is driven by the jib cylinder, and the arm is driven by the arm cylinder, so that the hydraulic crusher attached to the tip reaches a high place. It takes an extended posture or a substantially U-shaped posture in which the arm is folded so that the tip portion faces the construction machine side.

  By the way, in the past, when transporting an ultra-long attachment to a work site or the like, a method of disassembling the ultra-long attachment and individually loading a boom, a relay boom, an arm or the like onto a truck has been employed. However, in this method, it is necessary to assemble these booms, relay booms, arms, and the like at the work site, and there has been a problem that the assembly work requires a great amount of time and labor.

  In order to solve such a problem, for example, Patent Document 1 discloses a lateral beam on which a base end side of a boom of a folded subassembly for dismantling work (ultra long attachment) is placed, and a distal end portion of which is a base of the boom. There has been proposed a posture holding device including a mounting table having a receiving plate on which an arm folded so as to face the end side is mounted, and fixing the boom to the mounting table with a wire. According to this posture holding device, since the disassembly work subassembly is transported to the work site without being disassembled, the work of assembling the disassembly work subassembly at the work site can be omitted.

  Also, unlike the one in Patent Document 1, as shown in FIG. 9, in order to stably support the boom 107 composed of the insert boom 127 and the front boom 137, the base end side of the boom 107 is a horizontal beam 139, and The boom 107 is rigidly supported (supported at a fixed point) by the cross beam 141 at a position higher than the cross beam 139, and the arm 157 bent so that the front end portion faces the base end side of the boom is mounted on the gantry body. A posture holding device 102 that is rigidly supported by a cradle 143 fixed to 123 is also known.

JP 11-193543 A

  By the way, when the super long attachment 103 shown in FIG. 9 is installed on the posture holding device 102, the arm 157 is brought into contact with the receiving base 143 and the boom 107 is placed on the cross beams 139 and 141. A base end part and the front-end | tip part of the main boom 117 (refer FIG. 10) attached to the construction machine (not shown) will be cut away.

  And in order to isolate | separate the base end part of the boom 107 and the front-end | tip part of the main boom 117, the upper and lower boom pins 118a and 118b which connect these are made into the upper and lower pin insertion holes formed in the base end part of the boom 107. 127a and 127b and the upper and lower pin insertion holes 117a and 117b formed on the front end side of the main boom 117 need to be extracted.

  Here, it is rare that the axis centers of the upper and lower boom pins 118a and 118b completely coincide with the centers of the upper and lower pin insertion holes 127a, 127b, 117a, and 117b of the boom 107 and the main boom 117. As shown in FIG. 10 (a), the upper and lower boom pins 118a, 118b are both in the state of being the hole walls of the pin insertion holes 127a, 117a,. Therefore, when the upper and lower boom pins 118a and 118b are extracted from the upper and lower pin insertion holes 127a, 117a,..., The main boom 117 is first moved downward (in the direction of the white arrow) as shown in FIG. In other words, while keeping the upper boom pin 118a and the hole walls of the upper pin insertion holes 127a, 117a intentionally, in other words, the axis of the boom pins 118a, 118b and the pin insertion holes 127a, 117a, ... Is absorbed by the upper boom pin 118a and the upper pin insertion holes 127a and 117a to secure a clearance between the lower boom pin 118b and the hole walls of the lower pin insertion holes 127b and 117b. In this state, the lower boom pin 118b is removed from the lower pin insertion holes 127b and 117b. Next, as shown in FIG. 10 (c), the main boom 117 is slightly lifted upward (in the direction of the white arrow) to secure a clearance between the upper boom pin 118a and the hole walls of the upper pin insertion holes 127a and 117a. Therefore, the upper boom pin 118a is often extracted from the upper pin insertion holes 127a and 117a.

  However, as described in the above-mentioned Patent Document 1 and the one shown in FIG. 9, the arm 157 folded so that the distal end portion faces the base end side of the boom 107 is received by the fixed receiving base 143. The conventional posture holding device has the following problems. That is, in a state where the ultralong attachment 103 is held by the posture holding device 102, the boom 103 and the arm 157 are connected by the moving hook 155 (see FIG. 11) in order to reduce the burden on the jib cylinder 115 and the arm cylinder 119. However, when the moving hook 155 is attached, it is difficult to sequentially remove the lower and upper boom pins 118b and 118a from the lower pin insertion holes 127b and 117b and the upper pin insertion holes 127a and 117a in the above manner. Become.

  Specifically, in order to secure a clearance between the lower boom pin 118b and the hole walls of the lower pin insertion holes 127b and 117b, as shown in FIG. 11, the boom 107 is strongly pressed against the cross beam 141 and the main boom 117 is moved downward. 11 is connected to the movable hook 155 to form a rigid structure (no longer rotated by the pin coupling portions 137a and 147a), and the super-long attachment 103 will rotate clockwise in FIG. 11 with the horizontal beam 141 as a fulcrum. However, since the cradle 143 is a fixed point, the arm 157 cannot move in the direction of the white arrow C ′, and the distal end side and the base end side of the boom 103 are in the directions of the white arrows B ′ and A ′. It becomes difficult to move. For this reason, the conventional posture holding device 102 has a problem that the super long attachment 103 must be installed without the moving hook 155 attached, and the jib cylinder 115 and the arm cylinder 119 are burdened.

  On the other hand, even when the boom 103 and the arm 157 are not connected by the moving hook 155, the boom 103 and the relay boom 147 and the relay boom 147 and the arm 157 are connected by the jib cylinder 115 and the arm cylinder 119, respectively. If moved, the relay boom 147 and the arm 157 are interlocked. Therefore, in the conventional posture holding device 102, when the lower boom pin 118 b is removed from the lower pin insertion holes 127 b and 117 b, the arm 157 is not brought into contact with the receiving base 143, while the ultralong attachment 103 and the gantry main body 123 are connected. The super long attachment 103 was installed by shifting the rugs interposed therebetween little by little and repeating the height adjustment of the boom 147, the relay boom 147 and the arm 157. For this reason, there has been a problem that it takes a lot of time to complete the installation of the ultralong attachment 103 to the posture holding device 123.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a super-long attachment while maintaining a super-long attachment while reducing the burden on a cylinder provided in the ultra-long attachment. The object is to provide a technology capable of shortening the installation time of the attachment.

  In order to achieve the above object, in the present invention, the first and second support means for supporting the boom and the third support means for supporting the arm have different structures, and the base end portion of the boom is formed by the first support means. The second support means rigidly supports the distal end portion of the boom, while the third support means elastically supports the arm folded so that the distal end portion faces the base end side of the boom. While being supported stably, the mobility in the state mounted on the attitude | position holding frame is ensured.

  According to a first aspect of the present invention, there is provided a boom having a base end portion attached to a distal end portion of a main boom of a construction machine, a relay boom that is rotatably attached to the distal end portion of the boom, and a boom that is connected to the boom via the relay boom. An ultra-long attachment comprising an arm that is movably attached and a cylinder that connects the intermediate boom and the boom and the arm are folded so that the tip of the arm faces the base end of the boom. An ultra-long attachment posture holding frame that holds in an elevated state, extending in the longitudinal direction, which is the direction in which the boom extends, and surrounding the ultra-long attachment from both the left and right sides and the lower side, which are perpendicular to the longitudinal direction. A base body provided on the base, first support means for rigidly supporting the base end side of the boom, and the tip end side of the boom as the first A second support means for rigid support at a position higher than the lifting means, it is characterized in that it comprises a third support means for elastically supporting the arm.

  According to the first aspect of the invention, when the base end portion of the boom and the tip end portion of the main boom are separated, the boom is strongly pressed against the second support means in order to ensure the clearance between the boom pin and the hole wall of the pin insertion hole. When applied, since the second support means rigidly supports the boom at a position higher than the first support means, the ultralong attachment rotates with the second support means as a fulcrum. Here, since the third support means elastically supports the arm, the arm moves downward while being firmly supported, and accordingly, the base end portion of the boom is lowered downward. Thereby, the base end part of a boom and the front-end | tip part of a main boom can be cut | disconnected smoothly. Therefore, when the base end portion of the boom and the tip end portion of the main boom are separated, the height adjustment of the boom, the relay boom, and the arm is repeated by shifting the rug interposed between the ultra-long attachment and the posture holding device. Compared to the conventional posture holding device that is necessary, the installation time of the ultra-long attachment can be shortened.

  In addition, since the arm is elastically supported by the third support means, it is easy to lower the main boom downward even if the ultralong attachment is rigid (the arm and the relay boom do not rotate). Even when the arm and the arm are connected by a moving hook, there is no hindrance when separating the base end portion of the boom and the tip end portion of the main boom. Therefore, the moving hook can be attached to the ultra-long attachment, and the burden on the cylinder provided in the ultra-long attachment can be reduced.

  According to a second invention, in the first invention, the third support means includes a base attached to the gantry body, a receiving base for receiving the arm, and one end portion rotatably connected to the base. A first link member provided with a roller that is in rolling contact with the cradle at the other end, and the other end of the first link member that intersects the first link member and is pivotally connected to the cradle. And a second link member provided with a roller that is in rolling contact with the base, and a spring mechanism that applies an upward biasing force toward the boom tip side to both the link members.

  According to the second invention, the first link member is provided with a roller whose one end is rotatably connected to the base and is in rolling contact with the cradle at the other end. The intersecting second link member is rotatably connected at one end to the cradle and at the other end is provided with a roller that is in rolling contact with the base. It can also move in the longitudinal direction, which is the direction in which the boom (arm) extends.

  Further, since the spring mechanism gives the first and second link members an upward biasing force on the boom tip side, a force that pushes up the arm always acts on the cradle connected to the first and second link members. Become.

  For these reasons, the cradle is configured to be movable in the vertical direction and the longitudinal direction in accordance with the movement of the arm while contacting the upper surface of the arm, so that the movement of the arm accompanying the movement of the main boom is hindered. The arm can be stably supported without any problem. Therefore, it is possible to shorten the installation time while stably supporting the ultra-long attachment.

  According to a third invention, in the first or second invention, the base of the third support means is attached to the gantry body so as to be movable in the longitudinal direction.

  According to the third invention, since the base of the third support means is attached to the gantry body so as to be movable in the longitudinal direction, the super-long attachment having a different length is reliably elastically supported by the third support means. In addition, it is possible to absorb a shift in the longitudinal direction when the ultralong attachment is installed.

  According to the super long attachment posture maintaining frame of the present invention, when the main boom is lowered, the super long attachment rotates around the second support means and the arm is supported by the third support means. As the base end of the boom descends downward, the base end of the boom and the top end of the main boom can be easily separated, greatly reducing the installation time of the ultra-long attachment. can do.

  Also, by elastically supporting the arm with the second support means, it is easy to lower the main boom downward even if the ultra-long attachment is rigid, so it is possible to attach a moving hook to the ultra-long attachment Thus, the burden on the cylinder provided in the ultra-long attachment can be reduced.

It is a side view which shows the hydraulic excavator with which the super-long attachment was attached. It is a side view which shows the attitude | position holding stand of the ultra-long attachment which concerns on embodiment of this invention. It is a figure which shows typically the cross-sectional shape of a posture holding stand. It is a side view which shows typically the state by which the ultra-long attachment was mounted in the attitude | position holding frame. Fig. (A) is a side view of the shock absorber, Fig. (B) is a front view of the shock absorber, and Fig. (C) is a view showing a compression spring mechanism provided in the shock absorber. It is a side view which shows the attitude | position holding stand at the time of a disassembly and assembly operation. It is a figure which illustrates typically the installation method of a super-long attachment to a posture maintenance stand. It is a figure which illustrates typically the procedure at the time of connecting a boom and a main boom. It is a side view which shows the conventional attitude | position holding stand. It is a figure which illustrates typically the procedure at the time of removing a boom pin from a boom and a main boom. It is a figure which illustrates typically the installation method of a super-long attachment to the conventional posture maintenance stand.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a side view showing a hydraulic excavator provided with an ultralong attachment held by a posture holding frame according to the present invention. This hydraulic excavator (construction machine) 1 includes an excavator body 5 having a lower traveling body 9 equipped with a crawler 9a, and an upper revolving body 11 that is pivotably mounted on the upper portion of the lower traveling body 9, and a distal end. And an ultra-long attachment 3 to which a hydraulic crusher 13 is attached.

  This super-long attachment 3 is attached to the excavator body 5 so as to be able to be raised and lowered, and a boom 7 having a base end portion 7a attached to the tip end portion of the main boom 17, and a connecting pin 37a connected to the tip end portion 7b of the boom 7. A pivot boom 47 that is pivotably attached, and an arm 57 that is pivotally attached to the distal end portion of the relay boom 47 via a connecting pin 47a. The boom 7 is generally composed of an insert boom 27 attached to the distal end portion of the main boom 17 and a front boom 37 attached to the distal end portion of the insert boom 27. The boom 7 is connected to the main boom 17 by upper and lower boom pins 18a and 18b inserted into upper and lower pin insertion holes 27a and 27b (see FIGS. 4 and 6) formed in the base end portion 7a. .

  In the super long attachment 3, the boom 7 is the boom cylinder 21, the relay boom 47 is the jib cylinder (the cylinder connecting the relay boom 47 and the boom 7) 15, and the arm 57 is the arm cylinder (the relay boom 47 and the arm 57). Cylinder 19 that is connected to each other) so that the hydraulic crusher 13 attached to the tip extends substantially straight so as to reach a high place, and the tip 57a faces the hydraulic excavator 1 side. The arm 57 can be folded to take a substantially U-shaped posture.

  FIG. 2 is a side view showing a posture holding frame according to the present invention, and FIG. 3 is a diagram schematically showing a cross-sectional shape of the posture holding frame. The posture holding gantry 2 includes a gantry body 23 provided so as to extend in the boom longitudinal direction (longitudinal direction), which is the direction in which the boom 7 extends, and a basal-side receiving member that supports the basal-end side of the boom 7 (first Support means) 39, a tip side receiving member (second support means) 41 that supports the tip side of the boom 7, and a shock absorber (third support means) 43 that supports the arm 57. As shown in FIG. 6, the ultralong attachment 3 is held in a state where the distal end portion 57 a of the arm 57 is folded toward the base end portion 7 a side of the boom 7.

  As shown in FIG. 3, the gantry body 23 is formed in a substantially U-shaped cross section that opens upward, and surrounds the ultralong attachment 3 from both the left and right sides and the lower side, which are perpendicular to the longitudinal direction. It has become.

  The lower portion of the gantry body 23 is made of a steel pipe having a rectangular cross section, a pair of left and right vertical frame members 25, 25 extending in the boom longitudinal direction, and a steel pipe having a rectangular cross section, and extending in the left and right directions. The horizontal frame members 29, 29,... That connect the members 25, 25 and inclined frames 35, 35 that are inclined upward toward the proximal end side in the longitudinal direction.

  Further, both side portions of the gantry body 23 are made of steel pipes having a rectangular cross section, and are adjacent to support members 31, 31,... Extending upward from the upper ends of the vertical frame members 25, 25 with an interval in the boom longitudinal direction. A pair of left and right inclined reinforcement members 59, 59,... That connect the upper and lower ends of the support members 31, 31 and a steel pipe having a rectangular cross section and extending in the longitudinal direction so as to sandwich the ultralong attachment 3 from both the left and right sides. The girder members 33, 33 are generally constituted.

  The column members 31, 31,... Are horizontally reinforced so that the upper ends thereof are connected in the longitudinal direction by the girder members 33, 33, and the lower ends thereof are provided so as to correspond to the horizontal frame members 29, 29,. It is connected in the left-right direction by members 51, 51,. Each girder member 33, 33 is generally composed of three girder members having different installation heights, and the installation heights of the front-side girder member 33a, the central girder member 33b, and the proximal-side girder member 33c are set in this order. It is low.

  Further, the platform main body 23 is provided with stage scaffolds 53, 53,... For allowing the worker to perform the installation work of the ultralong attachment 3 on the left and right outer sides of the support members 31, 31,. It is provided to overhang. Further, the stage scaffolds 53, 53 are provided with a fall prevention fence 49 formed by connecting vertical pipe members 49a, 49a,... Extending in the vertical direction and horizontal pipe members 49b, 49b,. Is provided. And at the front-end | tip and center of the longitudinal direction in the left side of the gantry main body 23, the raising / lowering stairs 45a, 45b for going up and down to these stage scaffolds 53, 53, ... is provided.

  The base end side receiving member 39 is made of a steel pipe having a rectangular cross section, and is rotatable to the left central girder member 33b via a connecting pin 39a extending in the vertical direction above the elevating step 45b on the central side. It is attached. The base end side receiving member 39 is in contact with a stopper plate 39b fixed to the left central girder member 33b, thereby taking a first posture (two-dot chain line in FIG. 2) extending in the longitudinal direction. By rotating 90 degrees clockwise around the connecting pin 39a from the posture, the second posture extending in the left-right direction is formed so as to be bridged between the pair of left and right central girder members 33b, 33b. By making the base end side receiving member 39 in such a configuration, when the arm 57 passes between the pair of left and right central girder members 33b, 33b, the first posture is taken to avoid interference with the arm 57, and When the boom 7 is placed after the arm 57 has passed between the pair of left and right central girder members 33b, 33b, the second posture is taken to function as a both-end fixed beam, and the base end side of the boom 7 is rigidly supported. It becomes possible.

  On the other hand, the distal end side receiving member 41 is made of a steel pipe having a rectangular cross section, and is located above the ascending / descending step 45a on the distal end side in the longitudinal direction via a connecting pin 41a extending vertically to the left distal end side beam member 33a. It is pivotally attached. Thus, by attaching the front end side receiving member 41 to the front end side girder member 33a provided at a position higher than the central girder member 33b, the front end side receiving member 41 has the front end side of the boom more than the base end side receiving member 39. Also comes to support at a high position. The distal end side receiving member 41 is in contact with a stopper plate 41b fixed to the distal end in the longitudinal direction of the left distal end side girder member 33a, thereby taking a first posture (two-dot chain line in FIG. 2) extending in the longitudinal direction. On the other hand, by rotating 90 degrees clockwise about the connecting pin 41a from the first posture, the second posture extending in the left-right direction is taken so as to be bridged between the pair of left and right distal end side beam members 33a, 33a. It is configured. By adopting such a configuration of the distal end side receiving member 41, when the arm 57 passes between the pair of left and right distal end side beam members 33a, 33a, the first posture is taken to avoid interference with the arm 57, and When the boom 7 is placed after the arm 57 has passed between the pair of left and right distal end girder members 33a and 33a, the second posture is taken to function as a both-ends fixed beam and rigidly support the distal end side of the boom 7. It becomes possible.

  5 (a) and 5 (b), the shock absorber 43 includes a slide base (base) 83 attached to the gantry body 23, a receiving base 61 for receiving the arm 57, and one end sliding. A pair of left and right outer links (first link members) 79, 79 that are rotatably connected to the base 83 and provided with a flanged roller 63 that is in rolling contact with the cradle 61 at the other end, the left link 79 A pair of left and right inner links (second link members) 81, 81 that are crossed and have one end rotatably connected to the cradle 61 and provided with a roller 65 that is in rolling contact with the slide base 83 at the other end; A spring mechanism 77 that applies an urging force obliquely upward in the longitudinal direction to the links 79 and 81 is provided. In FIG. 5B, the spring mechanism 77 is not shown in order to make the drawing easy to see, and on the left side of the drawing, the outer and inner links 79 and 81 on the distal end side in the longitudinal direction, the slide base 83 and the cradle 61 are shown. Only the mounting structure of the outer and inner links 79, 81 on the base end side in the longitudinal direction, the slide base 83, and the pedestal 61 is shown on the left side of the drawing.

  Both ends of the slide base 83 are fixed to the lateral frame members 29 and 29 on the front and rear (longitudinal front end side and base end side) of the shock absorber 43, and extend in the longitudinal direction with a space in the left-right direction. It is attached to the pair of left and right channel steels 62, 62 so as to be movable in the longitudinal direction.

  A fixed base 58 extending in the longitudinal direction is attached to each of the groove steels 62 and 62 so as to connect the upper and lower flanges. Three fixed bases 58 are provided at the distal end side and the proximal end side in the longitudinal direction. Pin insertion holes 58a, 58a,... Are formed one by one. Further, feed screw seats 66, 66 are provided between the two groove steels 62, 62 at two locations on the front end side and the base end side in the longitudinal direction, and extend in the longitudinal direction to the both feed screw seats 66, 66. A slide square screw 89 is rotatably attached. A large-diameter sprocket 68 a is attached to the end of the sliding-side square screw 89 on the base end side in the longitudinal direction. The large-diameter sprocket 68 a is connected to a small-diameter sprocket 68 b attached to the handle 70 and a conduction chain 64. It is connected. Accordingly, the sliding square screw 89 rotates clockwise and counterclockwise by turning the handle 70.

  On the other hand, the slide base 83 is formed in a substantially U shape having a top wall part 83a and side wall parts 83b, 83b extending downward from the left and right end parts of the top wall part 83a. It is designed to be sandwiched from both the left and right sides. The top wall 83a of the slide base 83 is provided with a holder 91 that extends downward from its lower surface and engages with the sliding square screw 89, while each side wall 83b, 83b of the slide base 83 has Pin insertion holes 83c, 83c,... Are formed one by one at the ends on the distal end side and the proximal end side in the longitudinal direction.

  Then, when the handle 70 is turned, the slide square screw 89 rotates, and the holder 91 moves back and forth with the rotation of the slide square screw 89, whereby the slide base 83 extends longitudinally along the channel steels 62 and 62. Move to both sides in the direction. When the slide base 83 is moved to a predetermined position, the positioning pins 85 are inserted into the pin insertion holes 58a, 58a,... Of the fixed base 58 and the pin insertion holes 83c, 83c,. The slide base 83 is fixed to the gantry body 23 by inserting the pin removal prevention tool 87 into the positioning pin 85.

  A pair of mounting pieces 83d and 83d extending upward are formed on the top surface of the top wall 83a of the slide base 83 so as to face the left and right ends on the front end side in the longitudinal direction. A pair of attachment portions 83e, 83e extending upward are formed so as to face the central portion on the base end side in the left-right direction.

  The cradle 61 is a rectangular steel plate, and its upper surface is folded so that the distal end portion faces the proximal end side of the boom 7, so that the upper surface of the arm 57 faces downward. It has become. In addition, a pair of attachment pieces 61a and 61a are formed on the lower surface of the pedestal 61 so as to be opposed to the left and right end portions on the distal end side in the longitudinal direction in the left-right direction. The ridges 61b, 61b having a rectangular cross section projecting downward at both ends are formed to extend in the longitudinal direction. The attachment pieces 61a and 61a are formed at positions inside the attachment pieces 83d and 83d of the slide base 83.

  The left outer link 79 of the pair of outer links 79, 79 and the left inner link 81 of the pair of left and right inner links 81, 81 constitute a left scissor link, and the pair of outer links The right outer link 79 of 79 and 79 and the right inner link 81 of the pair of left and right inner links 81 and 81 constitute a right scissor link. These left and right scissor links are provided symmetrically with respect to the spring mechanism 77 and have substantially the same structure, so the left scissor link will be described below.

  The outer link 79 is made of an oval plate, and is attached to the shock absorber 43 so as to incline downward toward the front end in the longitudinal direction. The distal end portion (one end portion) of the outer link 79 is sandwiched between the mounting pieces 83d and 83d of the slide base 83, and the slide base is connected via the connecting pin 79a penetrating the outer link 79 and the mounting pieces 83d and 83d. 83 is rotatably connected. On the other hand, a flanged roller 63 is rotatably attached to the base end portion (the other end portion) of the outer link 79, and the flanged roller 63 sandwiches the protrusion 61b of the cradle 61 with the flange portion. In this state, it is relatively movable in the front-rear direction (longitudinal direction) while being in rolling contact with the cradle 61. In this way, the scissors link can be prevented from shifting in the left-right direction with respect to the cradle 61 by sandwiching the protruding portion 61b between the flange portions.

  On the other hand, the inner link 81 is made of an oval plate and is attached to the shock absorber 43 so as to incline upward toward the distal end in the longitudinal direction. The front end portion (one end portion) of the inner link 81 is sandwiched between the attachment pieces 61a and 61a of the cradle 61, and the cradle via the connection pin 81a that passes through the inner link 81 and the attachment pieces 61a and 61a. 61 is rotatably connected. On the other hand, a roller 65 is rotatably attached to the base end portion (the other end portion) of the outer link 79, and the roller 65 is relatively in the front-rear direction (longitudinal direction) while being in rolling contact with the slide base 83. It is movable.

  The outer link 79 and the inner link 81 are connected to a shaft 69 extending in the left-right direction at the central portion thereof by an end plate 73 and hexagon bolts 75 and 75, and are rotatable relative to each other. The left and right scissor links are also connected by a shaft 69, and the outer links 79 and 79 and the inner links 81 and 81 move in synchronization. Then, when an obliquely downward force (longitudinal direction base end side and vertical direction lower side) due to the load of the arm 57 is applied to the cradle 61, the flanged roller 63 comes into contact with the cradle 61 and the roller 65 slides. When the base member 83 rolls in contact with the base 83 and moves to the base end side in the longitudinal direction, and when the diagonally upward force (longitudinal tip side and top side in the vertical direction) by the spring mechanism 77 is applied to the cradle 61, the flanged roller 63 is moved. The roller 65 is brought into rolling contact with the cradle 61 and the roller 65 is brought into rolling contact with the slide base 83 to move upward and forward in the longitudinal direction.

  As shown in FIG. 5A, the spring mechanism 77 is attached to the shock absorber 43 so as to incline upward toward the distal end side in the longitudinal direction. As shown in FIG. 5 (c), the spring mechanism 77 includes a guide bar 96 having a protrusion 96a formed at the tip, and a coil spring 99 (compression spring) attached to the base end side of the protrusion 96a. A spring holder 98 for holding the screw, a threaded guide 93 attached to the base end side of the guide bar 96, an annular adjustment liner 95 through which the guide bar 96 penetrates the center, and an adjustment liner 95 And a coil spring 99 accommodated between the spring holder 98 and the threaded guide 93. Reference numeral 76 in the drawing is a nut with a tongue attached to the lower end (base end) of the guide bar 96.

  The threaded guide 93 includes a cylindrical guide main body 93a for guiding the guide bar 96, a rectangular parallelepiped guide receiving portion 93b having a through-hole through which the guide main body 93a is inserted, and both sides of the guide receiving portion 93b. Each has shaft portions 93c, 93c extending on both the left and right sides.

  A cylindrical protective collar 97 for protecting the coil spring 99 is attached to the guide body 93a on the tip side. A guide bar 96 is slidably inserted into the guide main body 93a and the protective collar 97. Further, the outer peripheral surface of the guide main body 93a and the inner peripheral surface of the through hole of the guide receiving portion 93b are threaded so as to be screwed together, and when the guide main body 93a is rotated, the guide main body 93a and the protective collar 97 moves up and down along the direction in which the guide bar 96 extends.

  The adjustment liner 95 is disposed on the distal end side of the guide receiving portion 93b so as to surround the guide main body 93a over the entire circumference. The coil spring 99 is disposed between the guide receiving portion 93 b and the spring holder 98 via the adjustment liner 95. As a result, the guide bar 96 slides with respect to the threaded guide 93 while resisting or being biased by the biasing force of the coil spring 99.

  Each shaft portion 93 c is rotatably attached to holders 78 and 78 via bushes 94 and 94. The holders 78 and 78 are fixed to the mounting portions 83e and 83e of the slide base 83 by bolts 80 and 80 with holes. As a result, the guide receiving portion 93b and the spring mechanism 77 are pivotally supported by the slide base 83 and are rotatable about the shaft portion 93c.

  In the spring mechanism 77 configured as described above, the guide bar 96 is connected to the shaft 69 connected to the left and right scissor links via the lever 84, so that the urging force is applied to the left and right scissor links. ing. More specifically, the lever 84 is connected to a collar 67 fitted to the shaft 69 at one end, and a head mounting pin 90 is attached to the other end. On the other hand, the distal end portion of the guide bar 96 is flat, and the distal end portion is rotatably connected to the head mounting pin 90 via the bush 88.

  In the shock absorber 43 provided with the spring mechanism 77, it is possible to adjust the initial height of the cradle 61 while keeping the designated load of the coil spring 99 constant by reassembling the adjustment liner 95. It has become. More specifically, when the initial height of the cradle 61 is set high, the shaft 69 connecting the left and right scissor links moves diagonally upward, and the guide bar 96 also moves diagonally upward accordingly. become. As described above, when the guide bar 96 moves, the distance between the guide receiving portion 93b and the spring holder 98 increases, and the designated load of the coil spring 99 changes at the initial setting when no load is applied to the receiving base 61. become. However, in the spring mechanism 77 of this embodiment, since the coil spring 99 is disposed between the guide receiving portion 93b and the spring holder 98 via the adjustment liner 95, the adjustment liner 95 is reassembled. More specifically, by reassembling the adjustment liner 95 to a thicker one, the distance between the guide receiving portion 93b and the spring holder 98 can be kept constant, and the specified load of the coil spring 99 can be kept constant. .

  When the guide bar 96 moves, the distance between the spring holder 98 and the tip of the protective collar 97 increases, but the guide main body 93a and the protective collar 97 are rotated by rotating the guide main body 93a as described above. Can be moved obliquely upward, the distance between the spring holder 98 and the tip of the protective collar 97 can be kept constant. As a result, the coil spring 99 can be prevented from being excessively contracted, and the coil spring 99 can be protected.

  On the other hand, when the initial height of the cradle 61 is set low, the adjustment liner 95 is reassembled to a thin one (or the adjustment liner 95 is removed), and the guide main body 93a and the protective collar 97 are slanted. By moving downward, the specified load of the coil spring 99 can be kept constant, and the distance between the spring holder 98 and the tip of the protective collar 97 can be kept constant.

  In the shock absorber 43 configured as described above, when the arm 57 is placed on the pedestal 61 and a force is applied obliquely downward in the longitudinal direction proximal end side, the pair of left and right outer and inner links 79, 81,. Rotate around the connecting pins 79a, 81a,. Then, the movements of the outer and inner links 79 and 81 are transmitted by the parallel keys 71 provided at both ends of the shaft 69, and the shaft 69 rotates.

  When the shaft 69 is rotated, the collar 67 is rotated by a parallel key 82 provided at the center of the shaft 69, whereby the lever 84 is rotated clockwise in FIG. Push in diagonally downward on the base end side in the longitudinal direction. At this time, the coil spring 99 pushes back the guide bar 96 obliquely upward in the longitudinal direction, so that the urging force of the coil spring 99 acts on the arm 57.

  As described above, since the cradle 61 of the shock absorber 43 is movable in the vertical direction and the longitudinal direction, in order to ensure the clearance between the lower boom pin 18b and the hole wall of the lower pin insertion hole 27b, As shown in FIG. 7, when the boom 7 is strongly pressed against the distal end side receiving member 41, it is connected by the moving hook 55 to become a rigid structure (no longer rotated by the pin coupling portions 37a and 47a). The attachment 3 rotates clockwise in FIG. 7 with the distal end side receiving member 41 as a fulcrum. At this time, since the cradle 43 moves under the load of the arm 57, the arm 57 moves in the direction of the white arrow C, and the distal end side and the base end side of the boom 3 move in the directions of the white arrows B and A, respectively.

-Installation procedure for ultra-long attachment-
Next, a procedure for installing the ultralong attachment 3 on the posture holding base 2 will be described.

  First, prior to the installation of the ultralong attachment 3 on the posture holding base 2, the handle 70 is turned to adjust the slide base 83 in the longitudinal direction along the groove steels 62 and 62 in order to match the dimensions of the ultralong attachment 3 and the like. Move. When the position of the slide base 83 is determined, the positioning pins 85 are inserted into the pin insertion holes 58a, 58a,... Of the fixed base 58 and the pin insertion holes 83c, 83c,. Is fixed to the gantry body 23. Further, the initial height of the cradle 61 is adjusted by the threaded guide 93 and the adjustment liner 95 while keeping the designated load of the coil spring 99 constant.

  Next, the boom cylinder 21, the jib cylinder 15 and the arm cylinder 19 are expanded and contracted, so that the ultralong attachment 3 is brought into a substantially U-shaped posture in which the arm 57 is folded so that the distal end portion 57a faces the hydraulic excavator 1 side. 3 is lowered with the shock absorber 43 fixed to the gantry body 23 as a target.

  Then, after the arm 57 passes between the pair of left and right central beam members 33b and 33b and the distal side beam members 33a and 33a, the proximal end side receiving member 39 is rotated 90 degrees clockwise from the first posture around the connecting pin 39a. By rotating to a second posture spanned between the pair of left and right central girder members 33b, 33b, the tip side receiving member 41 is rotated 90 degrees clockwise from the first posture about the connecting pin 41a. The second posture is spanned between the pair of left and right distal end girder members 33a and 33a.

  Next, the boom 7 is pressed against the distal end side receiving member 41 and the proximal end side receiving member 39 in this order, and the boom 7 is moved to the distal end side and the base side in a state where the reaction force of the distal end side receiving member 41 is larger than that of the proximal end side receiving member 39. It mounts on the end side receiving members 41 and 39. In other words, after placing the boom 7 on the distal end side and proximal end receiving members 41 and 39, the main boom 17 is lowered and pressed against the proximal end receiving member 39 at this stage. deep. Even if the weight of the arm 57 acts on the cradle 61, as described above, the shock absorber 43 elastically supports the arm 57, so that there is no problem. At this time, the connecting portion of the jib cylinder 15 and the connecting portion of the arm cylinder 19 are connected by the moving hook 55.

  Then, the base end side 7a of the boom 7 is lowered downward by making the reaction force of the distal end side receiving member 41 larger than the reaction force of the base end side receiving member 39, so that the upper boom pin 18a, the boom 7 and the main boom 17 In other words, while keeping the hole walls of the upper pin insertion holes 27a and 17a intentionally, in other words, the deviation between the axis of the boom pins 18a and 18b and the center of the pin insertion holes 27a, 27b, 17a, and 17b, It is as if absorbed by the upper boom pin 18a and the upper pin insertion holes 27a and 17a to ensure the clearance between the lower boom pin 18b and the hole wall of the lower pin insertion hole 27b. In this state, the lower boom pin 18b is moved to the lower pin. It is extracted from the insertion holes 27b and 17b.

  Next, the main boom 17 is slightly lifted upward to secure a clearance between the upper boom pin 18a and the hole walls of the upper pin insertion holes 27a and 17a, and then the upper boom pin 18a is removed from the upper pin insertion hole 27a. This completes the installation of the ultra-long attachment 3 to the posture holding gantry 2, and as shown in FIG. 4, the arm 57 is folded so that the distal end portion 57 a of the arm 57 faces the proximal end side of the boom 7. The long attachment 3 is held on the posture holding stand 2.

  On the other hand, when connecting the ultra-long attachment 3 held on the posture holding gantry 2 and the main boom 17 attached to the excavator main body 5, as shown in FIG. The excavator body 5 to which the main boom 17 is attached is moved closer. Then, as shown in FIG. 8 (a), a projection 17c having a concave guide provided at the distal end of the main boom 17 is brought close to a pin 7c formed on the base end side of the boom 7 from below, and As shown in the figure (b), the concave guide of the projection 17c is hooked on the pin 7c.

  With the concave guide hooked on the pin 7c as described above, while swinging the tip of the main boom 17 around the pin 7c, as shown in FIG. 8C, the upper pin insertion hole 27a of the boom 7 and The position of the upper boom insertion hole 17a formed at the tip of the main boom 17 is aligned, and the upper boom pin 18a is inserted into the pin insertion holes 17a and 27a to connect the boom 7 and the main boom 17.

  Next, while adjusting the undulation angle of the main boom 17, as shown in FIG. 8 (d), the lower pin insertion hole 27 b formed in the lower pin insertion hole 27 b of the boom 7 and the distal end portion of the main boom 17, The lower boom pin 18b is inserted into these pin insertion holes 17b and 27b, and the boom 7 and the main boom 17 are connected.

  Then, the proximal end side receiving member 39 and the distal end side receiving member 41 are set to the first posture, and the moving hook 55 is removed from the connecting portion of the arm cylinder 19.

-Effect-
According to the present embodiment, when the base end portion 7a of the boom 7 and the distal end portion of the main boom 17 are separated, the clearance between the lower boom pin 18b and the hole walls of the lower pin insertion holes 27b and 17b is secured. When the boom 7 is strongly pressed against the distal end side receiving member 41, the distal end side receiving member 41 rigidly supports the boom 7 at a position higher than the proximal end side receiving member 39. The member 41 is rotated around the fulcrum. Here, since the shock absorber 43 elastically supports the arm 57, the arm 57 moves downward while being firmly supported, and accordingly, the base end portion 7a of the boom 7 is lowered downward. Thereby, the base end part 7a of the boom 7 and the front end part of the main boom 17 can be smoothly separated. Accordingly, when the base end portion 7a of the boom 7 and the tip end portion of the main boom 17 are separated, the boom 7, the relay boom 47, Compared to a conventional posture holding device that needs to adjust the height of the arm 57, the installation time of the super-long attachment 3 can be greatly shortened.

  In addition, since the arm 57 is elastically supported by the shock absorber 43, the main boom 17 can be easily lowered downward even if the super long attachment 3 is rigid. Even when they are connected together, the base end portion 7a of the boom 7 and the tip end portion of the main boom 17 are not hindered. Therefore, the moving hook 55 can be attached to the ultralong attachment 3, and the burden on the jib cylinder 15 and the arm cylinder 19 provided in the ultralong attachment 3 can be reduced.

  Further, the outer link 79 is pivotally connected to the slide base 83 at the distal end portion, and is provided with a flanged roller 63 that is in rolling contact with the pedestal 61 at the proximal end portion. Since the link 81 is rotatably connected to the cradle 61 at the front end and a roller 65 is provided at the other end to make rolling contact with the slide base 83, the cradle 61 that receives the arm 57 is only in the vertical direction. In addition, it can also be moved in the longitudinal direction, which is the direction in which the boom 7 (arm 57) extends.

  Further, since the spring mechanism 77 applies an upward biasing force to the boom tip side on the scissor links (outer and inner links 79, 81) on both the left and right sides, the cradle 61 connected to the outer and inner links 79, 81 includes The force which always pushes up the arm 57 will work.

  For these reasons, the cradle 61 is configured to be movable in the vertical direction and the longitudinal direction in accordance with the movement of the arm 57 while being in contact with the upper surface of the arm 57, so that the arm 57 accompanying the movement of the main boom 17. The arm 57 can be stably supported without hindering the movement of. Therefore, it is possible to shorten the installation time while stably supporting the ultralong attachment 3.

  Further, since the slide base 83 of the shock absorber 43 is attached to the gantry body 23 so as to be movable in the longitudinal direction, the super long attachment 3 having different lengths can be reliably elastically supported by the shock absorber 43 and the ultra long A shift in the longitudinal direction when the attachment 3 is installed can be absorbed.

(Other embodiments)
The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  In the above embodiment, the gantry body 23 is configured by the vertical frame members 25, 25, the horizontal frame members 29, 29,..., The support members 31, 31,. If it is comprised so that may be enclosed from both the left-right direction both sides and lower side, it will not be restricted to this, For example, it is good also as a mount frame using the structure which used H-shaped steel etc. or combined the truss.

  Moreover, in the said embodiment, although the buffering device 43 which combined the outer and inner side links 79 and 81 and the spring mechanism 77 was used, if the arm 57 can be elastically supported, it will not restrict to this, For example, a rubber elastic body Or a shock absorber using an actuator.

  Furthermore, in the said embodiment, although the buffering device 43 was movable in a longitudinal direction, you may make it fix not only this but the buffering device 43 to a mount main body.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the present invention is useful for a posture holding stand or the like that holds an ultra-long attachment in a state where the distal end portion of the arm is folded so as to face the proximal end side of the boom.

1 Excavator (construction machine)
2 Posture maintenance stand 3 Super long attachment 7 Boom 7a Base end 7b Tip 15 Jib cylinder (cylinder)
17 Main boom 19 Arm cylinder (cylinder)
23 Base body 27 Insert boom (boom)
37 Front boom (boom)
39 Base end side receiving member (first supporting means)
41 Tip-side receiving member (second support means)
43 Shock absorber (third support means)
47 Relay boom 57 Arm 57a Tip 61 Receptacle 63 Roller with collar
65 Roller 79 Outer link (first link member)
77 Spring mechanism 81 Inner link (second link member)
83 Slide base (base)

Claims (3)

A boom whose base end portion is attached to the distal end portion of the main boom of the construction machine, an intermediate boom that is rotatably attached to the distal end portion of the boom, and an arm that is rotatably attached to the boom via the intermediate boom. And a super long attachment comprising the intermediate boom and a cylinder for connecting the boom and the arm, respectively, in a state where the tip end of the arm is folded so as to face the base end side of the boom. A posture attachment stand for a long attachment,
A gantry body that extends in the longitudinal direction, which is the direction in which the boom extends, and is provided so as to surround the ultralong attachment from both the left and right sides and the lower side, which are directions perpendicular to the longitudinal direction;
First support means for rigidly supporting the base end side of the boom;
Second support means for rigidly supporting the front end side of the boom at a position higher than the first support means;
And a third support means for elastically supporting the arm. In the super-long attachment posture holding frame according to claim 1,
The third support means includes a base attached to the gantry body, a cradle for receiving the arm, a roller having one end rotatably connected to the base and the other end being in rolling contact with the cradle. A first link member provided with a first cross member and a roller that intersects with the first link member and has one end rotatably connected to the cradle and the other end provided in rolling contact with the base. An ultra-long attachment posture holding stand comprising: two link members; and a spring mechanism that applies an upward biasing force toward the boom tip side to both link members. In the posture maintenance stand of the ultra-long attachment according to claim 1 or 2,
The super-long attachment attitude holding base, wherein the base of the third support means is attached to the base body so as to be movable in the longitudinal direction.

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