JP6627848B2 - Counter weight attachment / detachment device - Google Patents

Description

  The present invention relates to a counterweight attaching / detaching device provided in a construction machine.

  The counterweight of the construction machine is configured to be detachable from the rear part of the revolving frame of the upper revolving unit. For example, in a self-propelled crane, the counterweight is removed from the turning frame when moving to the site, and the counterweight is mounted on the turning frame at the site before the crane operation is performed. Patent Literature 1 below discloses an example of a counterweight attaching / detaching device for attaching / detaching such a counterweight to / from a revolving frame.

  Patent Literature 1 below discloses a counterweight attaching / detaching device provided in a crawler crane. The counterweight attachment / detachment device includes a detachable cylinder provided on a revolving frame of an upper revolving unit of a crawler crane so as to expand and contract in a vertical direction, and a radial direction of the piston rod connected to an upper end of a piston rod of the detachable cylinder. An arm extending in the front-rear direction of the revolving frame, and a pair of links disposed before and after the detachable cylinder and hanging from the arm, and a base plate connected to lower ends of the links via lower beams. And Counter weights are stacked on the base plate.

  When the counterweight is mounted on the revolving frame, the detachable cylinder extends and the piston rod rises, raising the arm to lift the lower beam, the base plate and the counterweight thereon, and then rotate the lower beam. Pin to frame. Thereby, the counterweight is mounted on the turning frame. When the counterweight is removed from the revolving frame, the counterweight is removed in a procedure reverse to that of the mounting.

JP 2006-219240 A

  However, in the counterweight attachment / detachment device of Patent Document 1, when the piston rod of the detachable cylinder moves up and down, the arm may interfere with other members on the upper rotating body.

  Specifically, the upper revolving superstructure of the crane disclosed in Patent Document 1 has a live mast for supporting the boom from behind on the revolving frame during the lifting operation, and the attachment and detachment of the counterweight to and from the revolving frame is not required. This is performed with the live mast lying down horizontally. The arm moves up and down through a height area close to the side of the fallen live mast as the piston rod moves up and down. The piston rod is inserted around the center axis of the cylinder tube so as to be rotatable with respect to the cylinder tube of the detachable cylinder, and the piston rod may rotate with respect to the cylinder tube due to some factor. In this case, the arm connected to the piston rod also rotates, and a portion near the front end or the rear end of the arm may interfere with the live mast.

  An object of the present invention is to provide a lifting device for raising and lowering a counterweight, even when a piston rod of a cylinder of a lifting device rotates around its central axis, when a connecting device connected to the piston rod moves up and down with respect to a predetermined object. It is an object of the present invention to provide a counter weight attaching / detaching device capable of avoiding interference.

  Provided by the present invention is a counterweight attachment / detachment device for attaching / detaching a counterweight to / from a revolving frame of an upper revolving structure of a construction machine. The counterweight attachment / detachment device is provided on the upper revolving unit, and moves up and down between a position where the counterweight is attached to the revolving frame and a position where the counterweight is detached below the attachment position. An interference avoiding device for avoiding interference between a predetermined object on the upper revolving unit and the elevating device, wherein the elevating device is provided on the upper revolving unit so as to expand and contract vertically. A hydraulic cylinder having a piston rod that moves up and down, and a connection tool connected to the piston rod so as to extend radially outward from the piston rod, wherein the object is moved in accordance with the elevation of the piston rod. An object that moves up and down through an adjacent height area that is an adjacent height area to an object; A connecting member that connects the connecting tool and the counter weight so that the connecting tool moves up and down, the connecting tool is configured to be rotatable around the central axis of the piston rod together with the piston rod, The rotation range around the central axis includes an interference range in which the connection tool interferes with the object when at least a part of the connection tool enters the adjacent height region; And an interference avoidance range that is a rotation range in which the connector does not interfere with the object when at least a part of the connector enters the adjacent height region. And a rotation restricting unit that restricts a rotation range of the connection tool to the interference avoidance range at any height position until the adjacent height region is reached by ascending or descending.

  In this counterweight attachment / detachment device, even when the piston rod of the hydraulic cylinder of the lifting / lowering device rotates around its central axis, the rotation restricting portion of the interference avoiding device raises or lowers the connector to the adjacent height region. Since the rotation range of the connection tool at any height position until reaching is limited to the interference avoidance range, it is possible to prevent the connection tool from interfering with the object. Therefore, it is possible to prevent the connection tool from interfering with the object when the connection tool moves up and down through the adjacent height region adjacent to the object.

  The rotation restricting unit is configured to reduce the rotation range of the connection tool to the interference avoidance range in a state where at least a part of the connection tool enters the adjacent height area in a process of moving the connection tool to the adjacent height area. It is preferable to limit to within.

  According to this configuration, it is possible to prevent the connection tool from interfering with the object when at least a part of the connection tool enters the adjacent height area in the process of moving the connection tool to the adjacent height area. can do.

  The rotation restricting section is configured to abut on the connecting tool when the connecting tool is at an interference avoiding position that is a rotational position before the object interferes with the object, so that the connecting tool moves beyond the interference avoiding position and the object is stopped. It is preferable to have a rotation preventing portion for preventing the connection tool from rotating toward the object side.

  According to this configuration, the rotation preventing portion can prevent the connecting portion from rotating toward the object beyond the interference avoiding position, so that the interference of the connecting device with the object in the adjacent height region is ensured. Can be avoided.

  The rotation restricting portion is configured to abut the connector when the connector rotated toward the object beyond the interference avoidance position moves toward the adjacent height region, thereby causing the connector to abut. It is preferable to have a guide surface for guiding to the interference avoidance position.

  According to this configuration, as the connecting tool moves toward the adjacent height region, the connecting tool can be guided by the guide surface and smoothly moved to the interference avoidance position.

  It is preferable that the guide surface has an inclination for converting the movement of the connector toward the adjacent height region into the rotation of the connector toward the interference avoidance position.

  According to this configuration, the connecting tool can be rotated to the interference avoidance position by the guide surface that comes into contact with the connecting tool only by moving the connecting tool toward the adjacent height region.

  The connector has a first portion extending from the piston rod to one side along a radial direction of the piston rod, and a second portion extending from the piston rod to an opposite side to the first portion, The blocking portion includes a first blocking portion that prevents rotation of the connecting device by contacting the first portion, and a second blocking portion that prevents rotation of the connecting device by contacting the second portion. It is preferred to have.

  According to this configuration, the rotation of the connector in one direction around the center axis of the piston rod and in any direction opposite to the one direction can also be caused by the contact of the first portion of the connector with the first blocking portion. The contact can be blocked by the contact of the second part of the connector with the second blocking part.

  The construction machine is an undulating member that is provided on the turning frame so as to be able to undulate and hangs a suspended load, a mast provided on the turning frame behind the undulating member, a tip of the mast, and the undulating member. A crane provided with a guide link for connecting the counterweight, wherein the counterweight attaching / detaching device is disposed within a width of the turning frame, and the storage object is disposed along a mast lying down on the turning frame. The guy link may be in the state.

  According to this configuration, since the counterweight attaching / detaching device is disposed within the width of the turning frame, the width of the turning frame can be increased to the full limit width during transportation, and the turning frame has a large size and high rigidity. Can be structured. Moreover, in this configuration, even when the counterweight attaching / detaching device is located within the width of the turning frame and comes close to the stored guide link, the rotation range of the connecting tool is stored. The connecting tool can be limited to an interference avoidance range where the connecting tool does not interfere with the guide link in the state, and the connecting tool can be prevented from interfering with the stored guide link.

  As described above, according to the present invention, even when the piston rod of the hydraulic cylinder of the elevating device for elevating and lowering the counterweight rotates around its central axis, the connecting device connected to the piston rod moves up and down. It is possible to provide a counterweight attaching / detaching device capable of avoiding interference with a predetermined object at times.

1 is a schematic side view of a crane to which a counterweight attaching / detaching device according to an embodiment of the present invention is applied. It is a figure which shows the arrangement | positioning of the counterweight, the counterweight attaching / detaching apparatus, the mast, and the guy link on the turning frame of the crane shown in FIG. 1 from the upper side. It is a side view which shows the state in which the counterweight was attached to the turning frame by the counterweight attaching / detaching apparatus. It is a side view which shows the state which removed the counterweight from the revolving frame with the counterweight attaching / detaching apparatus, and was lowered | hung to the ground. It is the figure which looked at the state where the counterweight was attached to the revolving frame by the counterweight attaching / detaching apparatus from the back. It is the figure which looked at the state where the counterweight was removed from the revolving frame by the counterweight attachment / detachment device and dropped on the ground from the rear. It is a perspective view of the counter weight attaching / detaching apparatus in the state where the counter weight was dropped on the ground. It is the figure which looked at the state where the connection tool of the counter weight attaching / detaching device rotated in the position above a guy link from above. FIG. 9 is a diagram illustrating a state where the connecting tool of the counterweight attaching / detaching device is lowered from the position in FIG. 8 and corrected to a normal rotation position, as viewed from above. It is the figure which looked at the counter weight attaching / detaching apparatus shown in FIG. 9 from back. It is a side view of the rear part of the upper revolving super structure of the crane to which the counter weight attaching / detaching apparatus by one modification of this invention was attached, and is a figure which shows the state which lowered the counter weight to the ground.

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

  FIG. 1 is a schematic side view of a crane 100 to which a detachable device 1 according to an embodiment of the present invention is applied. The crane 100 is an example of a construction machine in the present invention. First, the configuration of the crane 100 will be described.

  The crane 100 includes a lower traveling body 101 that can move on its own, and an upper revolving body 102 that is rotatably mounted on the lower traveling body 101. The upper revolving unit 102 is mounted on the lower traveling unit 101 so as to be revolvable and serves as a base of the upper revolving unit 102, and an up-and-down member attached to the front end of the revolving frame 110 so as to be able to undulate. And a boom 112 for raising and lowering the boom 112.

  The hoisting device 113 has a mast 114 and a pair of guy links 120.

  The mast 114 has a proximal end attached to the revolving frame 110 so as to be rotatable around an axis extending in the width direction of the revolving frame 110, and a distal end which is an end opposite to the proximal end. The mast 114 can be raised and lowered on the turning frame 110 by rotating around the axis.

  The pair of guy links 120 are separately arranged on both sides of the mast 114 in the width direction of the turning frame 110, and connect the tip of the mast 114 and the tip of the boom 112. The guide link 120 is an example of an object in the present invention. Each of the guy links 120 has a proximal end attached to the distal end of the mast 114 so as to be rotatable around an axis extending in the width direction of the turning frame 110. In the raising / lowering device 113, the mast 114 is rotated in a direction in which the mast falls down, thereby pulling the distal end of the boom 112 backward through the guy link 120, thereby raising the boom 112. In addition, in the raising / lowering device 113, the mast 114 is rotated in a direction in which the mast stands up, thereby supporting the front end of the boom 112 from the rear via the guy link 120 and rotating the boom 112 forward. Allow to do.

  In a normal working state of the crane 100 performing the lifting operation, as shown in FIG. 1, the mast 114 extends obliquely upward toward the rear, and the tip of the mast 114 and the tip of the boom 112 are connected by a pair of guy links. For example, when disassembling or assembling the crane 100 when the crane 100 is transported or the like, the connection between the pair of guy links 120 and the tip of the boom 112 is released, and the mast 114 is turned. The pair of guy links 120 are placed substantially horizontally on the frame 110, and are arranged along both sides of the mast 114 and stored in the mast 114 (see FIG. 2).

  A counterweight 130 is mounted at the rear of the turning frame 110 to ensure the stability of the crane 100. The counter weights 130 mounted on the turning frame 110 include a plurality of counter weights stacked in the vertical direction. The lowermost counterweight is a weight base 130 a having a shape that spreads to both outer sides in the width direction of the turning frame 110. Another counter weight 130b is loaded on the weight base 130a.

  As shown in FIGS. 5 and 6, the other counterweights 130b are stacked on both sides of the weight base 130a with a widthwise central area left therebetween. And, by attaching the weight base 130a to the rear part of the turning frame 110, the weight base 130a and another counter weight 130b stacked thereon are mounted on the turning frame 110.

  Specifically, a pair of front mounting brackets 112a and a pair of rear mounting brackets 112b are provided at the rear of the turning frame 110 so as to protrude downward from the lower surface thereof (see FIGS. 4 and 6). . The pair of rear mounted brackets 112b are provided separately on the left and right sides of the rear end of the turning frame 110. Further, the pair of front mounting brackets 112a are provided separately at the rear of the turning frame 110 at a position away from the rear mounting bracket 112b at the front of the turning frame 110, on the left and right sides of the rear of the turning frame 110. .

  A pair of front mounting brackets 134a and a pair of rear mounting brackets 134b are provided in the central region of the weight base 130a (see FIGS. 4 and 6). The pair of front mounting brackets 134a are erected on the upper surface of the front part of the weight base 130a, and are spaced apart from each other symmetrically with respect to the center in the width direction of the weight base 130a. The pair of rear mounting brackets 134b are erected on the upper surface of the rear part of the weight base 130a, and are spaced apart from each other symmetrically with respect to the center in the width direction of the weight base 130a. The pair of front mounting brackets 134a is pin-coupled to the pair of front mounting brackets 112a, and the pair of rear mounting brackets 134b is pin-coupled to the pair of rear mounting brackets 112b. The base 130a is adapted to be attached to the rear part of the turning frame 110. The pin connection between the front mounting bracket 134a and the front mounted bracket 112a and the pin connection between the rear mounting bracket 134b and the rear mounted bracket 112b can be released, and the pin connection can be released. Thereby, the weight base 130a can be removed from the turning frame 110.

  A pair of front-side lifting brackets 136a and a pair of rear-side lifting brackets 136b are provided in the central region of the weight base 130a (see FIGS. 4 and 6). The pair of front lifting brackets 136a is adjacent to the pair of front mounting brackets 112a on the rear side at the front portion of the weight base 130a, and the width direction of the weight base 130a relative to the front mounting bracket 112a. It is erected at a position adjacent to the inside. The pair of rear lifting brackets 136b are adjacent to the front of the pair of rear mounting brackets 112b at the rear of the weight base 130a, and the weight of the weight base 130a relative to the rear mounting bracket 112b. It is erected at a position adjacent to the inside in the width direction.

  The counterweight attachment / detachment device 1 according to the present embodiment is provided on the upper revolving unit 102 of the crane 100 configured as described above, and is for attaching / detaching the counterweight 130 to / from the rear portion of the revolving frame 110. Hereinafter, the counterweight attaching / detaching device 1 is abbreviated as the attaching / detaching device 1.

  The crane 100 is provided with a pair of attachment / detachment devices 1. The pair of attachment / detachment devices 1 are separately installed at the rear of the turning frame 110 on the left and right sides, and both are provided within the width of the rear of the turning frame 110. Specifically, as shown in FIG. 2, the pair of attachment / detachment devices 1 are arranged on both left and right sides of the mast 114 and further outside the pair of guy links 120 in the width direction of the turning frame 110. The attachment / detachment device 1 is disposed adjacent to the guy link 120 in the width direction of the turning frame 110. Since the pair of attachment / detachment devices 1 have the same configuration, the configuration of one attachment / detachment device 1 will be described as a representative.

  The attaching / detaching device 1 includes an elevating device 2 and an interference avoiding device 3 (see FIG. 6).

  The elevating device 2 is installed at the rear part of the turning frame 110, and the mounting position of the counter weight 130 with respect to the turning frame 110 (see FIGS. 3 and 5) and the removing position below the mounting position (see FIGS. 4 and 6). It goes up and down between. The removal position is a position where the counterweight 130 is lowered on the ground G. The elevating device 2 includes a hydraulic cylinder 4, a connector 5, a front connecting member 6, and a rear connecting member 7.

  The hydraulic cylinder 4 is lifting means for raising and lowering the counterweight 130. The hydraulic cylinder 4 is attached to a rear side portion 110a of the turning frame 110 so as to expand and contract in the vertical direction. The hydraulic cylinder 4 has a cylinder tube 14 and a piston rod 16.

  The cylinder tube 14 has a substantially cylindrical shape, and is fixed to the side portion 110a of the revolving frame 110 so that the center axis thereof extends in the vertical direction. The piston rod 16 is inserted into the cylinder tube 14 with its central axis extending vertically, and protrudes upward from the cylinder tube 14. The hydraulic cylinder 4 causes the piston rod 16 to advance and retreat along the central axis with respect to the cylinder tube 14 by the hydraulic pressure supplied to the cylinder tube 14, thereby moving the piston rod 16 up and down. The piston rod 16 is rotatable with respect to the cylinder tube 14 around its central axis.

  The connecting tool 5 has a balance shape and is connected to the distal end of the piston rod 16 so as to extend from the distal end (upper end) of the piston rod 16 to both outer sides in the radial direction of the piston rod 16. The distal end of the piston rod 16 is fixed to the center of the connector 5 in the front-rear direction of the turning frame 110. The connecting device 5 is fixed to the piston rod 16 and moves up and down together with the piston rod 16 when the piston rod 16 moves up and down. When the piston rod 16 rotates around its central axis, the connecting device 5 moves together with the piston rod 16 and the piston rod 16. It is designed to rotate around the central axis.

  The connecting device 5 is an adjacent height region A (FIG. 10), which is a height region adjacent to the guy link 120 in the retracted state on the outer side in the width direction of the revolving frame 110 as the piston rod 16 moves up and down. (See Reference). Specifically, the adjacent height area A is a height area between the upper edge and the lower edge of a portion of the fellow stored guide link 120 that is adjacent to the connector 5 in the width direction of the turning frame 110. is there. When at least a part of the range from the upper end to the lower end of the connector 5 enters the adjacent height region A, the connector 5 rotates around the central axis of the piston rod 16. The front end or the rear end may protrude toward the guy link 120 and interfere with the stored guy link 120 (see FIG. 8). That is, the rotation range around the central axis of the connecting tool 5 includes an interference range in which the connecting tool 5 interferes with the retracted guy link 120 in the adjacent height area A, and an adjacent height area. A includes an interference avoidance range which is a rotation range in which the connecting tool 5 does not interfere with the stored guide link 120.

  In addition, the connecting tool 5 includes an inner plate 5a that forms an inner end surface of the connecting tool 5 in the width direction of the turning frame 110, and an outer plate that forms an outer end face of the connecting tool 5 in the width direction of the turning frame 110. 5b. The inner plate 5a and the outer plate 5b are parallel to each other and are arranged with a space between them. The inner plate 5a and the outer plate 5b have lower edges extending in a direction perpendicular to the central axis of the piston rod 16. A corner 5c (see FIG. 10) between the outer surface of the outer plate 5b facing outward in the width direction of the revolving frame 110 and the lower end surface of the outer plate 5b is chamfered. Thereby, when the corner 5c hits a front side restriction part 26 and a rear side restriction part 27 to be described later, damage to the front side restriction part 26 and the rear side restriction part 27 is reduced.

  The front connecting member 6 and the rear connecting member 7 connect the connecting tool 5 and the weight base 130a of the counterweight 130 so that the counterweight 130 moves up and down as the connecting tool 5 moves up and down. The front-side connecting member 6 and the rear-side connecting member 7 are separately arranged before and after the hydraulic cylinder 4. The front connecting member 6 is hung down from the front end of the connecting tool 5 and extends downward from the front end. The rear connecting member 7 hangs down from the rear end of the connector 5 and extends downward from the rear end. The upper end of the front connection member 6 is arranged between the front end of the inner plate 5a and the front end of the outer plate 5b of the connector 5, and is pin-connected to the front ends. The upper end of the rear connecting member 7 is arranged between the rear end of the inner plate 5a and the rear end of the outer plate 5b of the connector 5, and is pin-connected to the rear ends.

  The front-side connecting member 6 has a front-side connecting bracket 6a that is detachably coupled to the front-side lifting bracket 136a of the weight base 130a at a lower end thereof. The rear connecting member 7 has a rear connecting bracket 7a at the lower end thereof, which is detachably connected to the rear lifting bracket 136b of the weight base 130a. The front connection bracket 6a is pin-connected to the front lifting bracket 136a, and the rear connection bracket 7a is pin-connected to the rear lifting bracket 136b. Thereby, the front connection member 6 and the rear connection member 7 are connected to the weight base 130a. The pin connection between the front connection bracket 6a and the front lifting bracket 136a and the pin connection between the rear connection bracket 7a and the rear lifting bracket 136b can be released, and the front connection is released by releasing the pin connection. The member 6 and the rear connecting member 7 can be separated from the weight base 130a.

  The location where the weight base 130a is separated is not limited to the location where the connection brackets 6a and 7a and the lifting brackets 136a and 136b are joined, and the weight base 130a can be separated and separated at various other locations. Is also good. For example, the weight base 130a may be separated by allowing the connecting members 6, 7 to be vertically separated at any point on the front and rear connecting members 6, 7. More specifically, for example, the front connection bracket 6a is configured to be separable from a portion of the front connection member 6 above the front connection bracket 6a, and the rear connection bracket 7a is connected to the rear connection member 7. The weight base 130a may be detachable by being configured to be detachable from a portion above the rear connection bracket 7a.

  The interference avoiding device 3 is a device for avoiding the interference between the guy link 120 adjacent to the elevating device 2 on the revolving frame 110 and the connecting tool 5 of the elevating device 2. The interference avoiding device 3 is provided at the rear of the turning frame 110 and adjacent to the outside of the elevating device 2 in the width direction of the turning frame 110. The interference avoiding device 3 has a support portion 24 and a rotation restricting portion 25.

  The support part 24 is installed on the side part 110 a at the rear of the turning frame 110 and supports the rotation restricting part 25. The support portion 24 is provided upright on the upper surface of the side portion 110a of the turning frame 110. The support part 24 has a front support 28, a rear support 29, a bridge 30, a front mounting part 31, and a rear mounting part 32.

  The front support 28 and the rear support 29 are spaced apart from each other on the rear side 110 a of the turning frame 110. The front support 28 and the rear support 29 both extend upward from the upper surface of the side 110a at the rear of the revolving frame 110 and have a shape bent in a crank shape.

  The erection portion 30 is erected between a portion near the upper end of the front column 28 and a portion near the upper end of the rear column 29, and connects the portions near the upper ends of the columns 28, 29. The erection portion 30 extends in the front-rear direction of the turning frame 110.

  The front attachment portion 31 is attached to the upper end of the front support 28, and protrudes from the upper end inward in the width direction of the turning frame 110. The rear attachment part 32 is attached to the upper end of the rear support 29, and protrudes inward in the width direction of the turning frame 110 from the upper end.

  In the present embodiment, the rotation restricting portion 25 moves the piston rod 16 at a predetermined height position until the connecting tool 5 reaches the adjacent height region A by descending from above the adjacent height region A. The rotation range of the connector 5 around the central axis is limited within the interference avoidance range, and the rotation range of the connector 5 is set in a state where at least a part of the connector 5 is in the adjacent height area A. This is to limit the interference avoidance range. Specifically, the rotation restricting portion 25 is configured such that the height within the adjacent height region A is slightly lower than the upper end of the adjacent height region A from the height position slightly above the upper end of the adjacent height region A. The rotation range of the connector 5 is limited to the interference range over the position.

  More specifically, the rotation restricting portion 25 includes a front restricting portion 26 that contacts a portion of the connecting device 5 on the front side of the piston rod 16 to restrict the rotation of the connecting device 5, And a rear restricting portion 27 that contacts a portion on the rear side of 16 and restricts the rotation of the connector 5. The part of the connecting tool 5 on the front side of the piston rod 16 and the part on the rear side of the piston rod 16 are examples of a first part and a second part in the present invention.

  The front-side restricting portion 26 is attached to the front-side mounting portion 31 of the support portion 24, and protrudes from the support portion 24 inward in the width direction of the turning frame 110. The rear limiting portion 27 is attached to the rear mounting portion 32 of the support portion 24, and protrudes from the support portion 24 inward in the width direction of the turning frame 110. The front-side restricting portion 26 and the rear-side restricting portion 27 are separately arranged on one side in the radial direction of the piston rod 16 where the connector 5 extends with respect to the piston rod 16 and on the opposite side. In the present embodiment, the front-side restricting portion 26 is disposed on the front side of the piston rod 16, and the rear-side restricting portion 27 is disposed on the rear side of the piston rod 16. The separation distance between the piston rod 16 and the front restriction part 26 in the front-rear direction of the revolving frame 110 and the separation distance between the piston rod 16 and the rear restriction part 27 in the same direction are equal.

  The front-side restricting portion 26 and the rear-side restricting portion 27 make contact with the connecting device 5 when the connecting device 5 is in an interference avoiding position, which is a rotational position before the connecting member 5 interferes with the stored guide link 120. 5 have rotation preventing portions 42 for preventing the rotation of the connecting tool 5 toward the guy link 120 beyond the interference avoiding position. In the present embodiment, the interference avoiding position is such that, in the present embodiment, the surface of the connector 5 facing the guy link 120 is arranged in parallel with the guy link 120, and a gap is formed between the surface and the guy link 120. The rotational position of the tool 5. The rotation prevention unit 42 is a lower part of the front side restriction unit 26 and the rear side restriction unit 27. Further, the rotation preventing portion 42 of the front side restricting portion 26 and the rotation preventing portion 42 of the rear side restricting portion 27 are examples of a first blocking portion and a second blocking portion in the present invention.

  The end surfaces of the rotation preventing portions 42 of the front and rear limiting portions 26 and 27 on the guide link 120 side, that is, the inner end surfaces of the rotation preventing portions 42 of the both limiting portions 26 and 27 in the width direction of the turning frame 110 are connected to the turning frame 110. Are arranged at the same position in the width direction, and their end faces are both in the range from the upper end of the adjacent height area A to the slightly higher height position and slightly from the upper end of the adjacent height area A. Then, the outer surface of the connecting tool 5 that has entered the range up to the lower height position comes into contact with the guy link 120 from the opposite side (the outer side in the width direction of the turning frame 110). That is, the end surface of the rotation preventing portion 42 of the front side restricting portion 26 comes into contact with the outer surface of the portion of the connecting tool 5 on the front side of the piston rod 16 from the opposite side to the guy link 120 and the rotation of the rear side restricting portion 27. The end surface of the blocking portion 42 comes into contact with the outer surface of a portion of the connecting tool 5 behind the piston rod 16 from the side opposite to the guy link 120. Thereby, the rotational position of the connecting tool 5 is positioned at the interference avoiding position. The height position of the upper end of the end face of the rotation preventing portion 42 is higher than the height position of the upper end of the portion adjacent to the connector 5 in the stored guide link 120, that is, the upper end of the adjacent height area A. Height position. The height position of the lower end of the end face of the rotation preventing portion 42 is a height position equal to or lower than the upper end of the adjacent height region A, and specifically, is slightly lower than the upper end of the adjacent height region A. It is a height position in the adjacent height area A.

  Further, the front-side restricting portion 26 and the rear-side restricting portion 27 are connected to each other as the connecting tool 5 descends toward the adjacent height region A in a height region deviating upward from the adjacent height region A. It has the guide part 44 which guides the tool 5 to the said interference avoidance position, respectively. The guide portion 44 is a portion of the front side restricting portion 26 and the rear side restricting portion 27 above the rotation preventing portion 42.

  The guide portion 44 is used when the connecting tool 5 rotated toward the guy link 120 beyond the interference avoidance position in the height region deviated upward from the adjacent height region A descends toward the adjacent height region A. A guide surface 44a for guiding the connector 5 to the interference avoidance position by contacting the lower edge of the connector 5 (the lower edge of the outer plate 5b). The guide surface 44a has an inclination that converts the descent of the connector 5 toward the adjacent height area A into the rotation of the connector 5 toward the interference avoidance position.

  Specifically, the guide surface 44a is an end surface on the guide link 120 side of the guide portion 44, that is, an inner end surface of the guide portion 44 in the width direction of the turning frame 110. The guide surface 44 a is an inclined surface that is inclined toward the guy link 120 as it goes downward, and the lower end thereof is connected to the upper end of the inner end surface of the rotation preventing portion 42.

  In a posture in which the connecting tool 5 is rotated from the interference avoiding position, one of a part near the front end and a part near the rear end of the connecting tool 5 protrudes toward the guy link 120 side, and the other part is connected to the front side limiting part 26. Or, it protrudes toward the rear side restriction part 27 side. When the connecting tool 5 in this state descends from the upper side of the adjacent height area A toward the adjacent height area A, the lower edge portion of the part protruding toward the front side restriction part 26 or the rear side restriction part 27 corresponds. The rotational position of the connector 5 is corrected to the interference avoiding position by being guided by the guide surface 44a while abutting on the guide surface 44a of the limiting portion to slide and sliding on the guide surface 44a.

  Further, the front-side restricting portion 26 and the rear-side restricting portion 27 are made of a material that does not damage the connecting tool 5 that comes into contact therewith. Specifically, the front side restriction part 26 and the rear side restriction part 27 are made of a synthetic resin having a low coefficient of friction, for example, nylon. Since the front-side restricting portion 26 and the rear-side restricting portion 27 are made of a synthetic resin having a low coefficient of friction, when the connecting tool 5 comes into contact with the guide surface 44a, the connecting surface 5a slides easily, and the connecting device 5 is hardly damaged. Has become.

  In the attachment / detachment device 1 of the present embodiment, even when the piston rod 16 of the hydraulic cylinder 4 of the lifting / lowering device 2 rotates around its central axis, the rotation restricting portion 25 lowers the connecting device 5 so that the adjacent height is lowered. At the height position before reaching the height region A, the rotation range of the connecting tool 5 is limited to an interference avoidance range that does not interfere with the stored guide link 120. Therefore, it is possible to prevent the connecting tool 5 from interfering with the guy link 120 when the connecting tool 5 is moved up and down.

  Further, in the present embodiment, even when at least a part of the connecting tool 5 enters the adjacent height region A, the rotation restricting unit 25 limits the rotation range of the connecting tool 5 to the interference avoidance range. For this reason, even when at least a part of the connecting tool 5 enters the adjacent height region A, it is possible to avoid the interference of the connecting tool 5 with the guy link 120 due to the rotation of the connecting tool 5.

  Heretofore, it has been known that a hydraulic cylinder is provided with a detent for the piston rod in order to prevent the rotation of the piston rod with respect to the cylinder tube. By adding such a detent to the hydraulic cylinder of the attaching / detaching device, it is known. It is conceivable to prevent the rotation of the piston rod itself and, consequently, also prevent the rotation of the connector. This detent is a long and narrow rod member disposed radially outside the piston rod and the cylinder tube along the piston rod and fixed to the piston rod, and a hole member having a hole through which the rod member is inserted. And fixed to the outer peripheral surface of the cylinder tube. The displacement of the rod in the rotation direction of the piston rod with respect to the cylinder tube is restricted by the hole member. Therefore, the rotation of the piston rod to which the rod is fixed with respect to the cylinder tube is prevented.

  However, when such a detent is added, a space for disposing the detent is required on the radially outer side of the hydraulic cylinder, and the mounting / detaching device has to be enlarged. In the form in which the detachable device is disposed in the turning frame, if the detachable device is enlarged, other space around the detachable device must be reduced, for example, the space for engine maintenance is reduced, The hydraulic oil tank must be made smaller, or the space for installing the reinforcing material of the turning frame cannot be secured, and it becomes difficult to reinforce the turning frame. Further, when a force is applied from a hydraulic cylinder to a bar having a small rotation, the bar may be damaged. In addition, since machining of the hydraulic cylinder is performed after the rotation stopper is attached to the hydraulic cylinder, machining of the hydraulic cylinder becomes complicated and productivity is deteriorated. As described above, adding a conventionally known detent to the hydraulic cylinder 4 of the attaching / detaching device 1 according to the present embodiment causes various problems. On the other hand, in the configuration in which the rotation limiter 25 of the present embodiment limits the rotation range of the connector 5 to within the interference avoidance range, the above-described problem due to the addition of the rotation stopper does not occur.

  Further, in the present embodiment, since the attaching / detaching device 1 is installed within the range of the width of the swivel frame 110, the width of the swivel frame 110 can be increased to the limit width that can be transported by a trailer or the like. Therefore, it is possible to make the upper revolving structure 102 including the revolving frame 110 transportable by a trailer or the like while making the revolving frame 110 large and have a high rigidity structure.

  Moreover, since the attaching / detaching device 1 is installed within the range of the width of the turning frame 110, the attaching / detaching device 1 passes through the adjacent height area A close to the guy link 120 in the retracted state on the turning frame 110. Even if the connecting device 5 of the device 1 moves up and down, the connecting device 5 can be prevented from interfering with the guy link 120 when the connecting device 5 rotates around the central axis of the piston rod 16. Specifically, in the present embodiment, the rotation of the connector 5 in the adjacent height region A can be limited to the interference avoidance range as described above. Can be avoided. That is, in the present embodiment, it is possible to simultaneously increase the rigidity of the revolving frame 110, secure the transportability of the upper revolving unit 102, and avoid interference of the connecting tool 5 with the guy link 120.

  Further, in the present embodiment, the front-side restricting portion 26 and the rear-side restricting portion 27 move the connecting tool 5 rotated out of the interference avoidance range in the height region deviating upward from the adjacent height region A to the adjacent height region A. It has a guide surface 44a for guiding the connector 5 so that the connector 5 rotates to the interference avoidance range as it descends. For this reason, it is possible to smoothly shift the connector 5 rotated from the interference avoiding position to the interference avoiding position as it descends to the adjacent height region A in a height region deviating upward from the adjacent height region A. it can. Therefore, when the connecting tool 5 enters the adjacent height area A, the rotational position of the connecting tool 5 is the interference avoiding position, and the interference of the connecting tool 5 with the stored guide link 120 can be avoided.

  Further, in the present embodiment, the rotation preventing portion 42 of the front side restricting portion 26 comes into contact with a portion of the connecting device 5 on the front side of the piston rod 16 to prevent the rotation of the connecting device 5, and The rotation preventing portion 42 comes into contact with a portion of the connecting tool 5 located on the rear side of the piston rod 16 to prevent the connecting tool 5 from rotating. For this reason, the rotation of the connector 5 from the interference avoiding position in either one direction or the opposite direction around the center axis of the piston rod 16 is also performed by the rotation prevention portions 42 of the front side restriction portion 26 and the rear side restriction portion 27. This can prevent the interference of the connector 5 with the guy link 120 in the stored state.

  The counterweight attaching / detaching device according to the present invention is not necessarily limited to the above-described configuration. As a configuration of the counterweight attaching / detaching device according to the present invention, for example, the following configuration can be adopted.

  The object to be prevented from interfering with the connection tool is not necessarily limited to the guy link, and may be any object that is adjacent to the counterweight attaching / detaching device. For example, the target object may be a gantry in a stored state. FIG. 11 shows a modification configured to avoid such interference of the connection tool with the gantry.

  In the modification shown in FIG. 11, the attachment / detachment device 1 is disposed behind the turning frame 110 and attached to the rear end of the turning frame 110. The upper revolving structure of the crane of the modified example has a gantry 150 installed on the revolving frame 110. In the retracted state, the gantry 150 falls down and extends rearward from the turning frame 110 as shown in FIG. The gantry 150 stands up in the normal working state of the crane, and has its upper end connected to the tip of an up-and-down member such as a boom (not shown) via various ropes and the like to support the up-and-down member from behind. .

  The connecting tool 5 of the attaching / detaching device 1 attached to the rear end of the turning frame 110 moves up and down through the adjacent height area A which is close to the outside of the gantry 150 in the retracted state in the width direction of the turning frame 110. In the crane having such a configuration, for example, a support portion of the interference avoiding device is attached to the rear end of the turning frame 110, and the rotation restricting portion of the interference avoiding device causes the connecting device 5 to reach the adjacent height region A. In a state where the height position and at least a part of the connector 5 are in the adjacent height area A, the connector 5 stores the rotation range of the connector 5 around the central axis of the piston rod 16 of the hydraulic cylinder 4. What is necessary is just to limit it to the interference avoidance range which does not interfere with the gantry 150 in the state.

  The target object is hydraulic equipment such as hydraulic oil tanks, pumps, and piping mounted on the upper revolving unit, and various devices such as engines, masts, guy lines, and spreaders, sheaves, and winches for raising and lowering devices for raising and lowering members. It may be.

  The attachment of the rotation restricting part is not necessarily limited to the turning frame. That is, according to the position of the counterweight attaching / detaching device in the upper revolving unit, the rotation restricting unit may be attached to the counterweight attaching / detaching device at a position adjacent to the counterweight attaching / detaching device. Therefore, for example, the rotation limiting unit may be attached to any of the mast, the gantry, and the various devices.

  In addition, when the connecting tool moves up and down through the adjacent height area between a height position lower than the adjacent height area and a height position higher than the adjacent height area, the connecting tool is Upper rotation limiter that limits the rotation range of the connector to the interference avoidance range when descending from the height position to the adjacent height region, and the connector rises from the lower height position to the adjacent height region In this case, a lower rotation restricting portion that restricts the rotation range of the connection tool to the interference avoidance range may be arranged vertically.

  Further, in this case, the upper rotation restriction unit and the lower rotation restriction unit may be integrated into one rotation restriction unit. For example, it has an upper guide surface that is inclined so that the edge on the connection portion side is directed downward toward the connector and a lower guide surface that is inclined such that it is directed upward toward the connector. Alternatively, a triangular rotation restricting portion may be used in which the two guide surfaces are continuous. Further, the upper guide surface and the lower guide surface of the edge on the connector side may be a trapezoidal rotation restricting portion connected via an end surface extending vertically between the upper guide surface and the lower guide surface.

  Further, the guide surface of the rotation restricting portion may be an arc-shaped curved surface. In this case, when the upper rotation restriction part and the lower rotation restriction part are integrated into one rotation restriction part, the guide surface of the rotation restriction part may be a semicircular curved surface. .

  The height position at which the rotation limiter limits the rotation range of the connection tool is not necessarily limited to the height position described in the above embodiment. For example, when avoiding interference of the connection tool with respect to an object when the connection tool moves down from above the adjacent height area and moves to the adjacent height area, the rotation restricting unit is located above the adjacent height area. The range of rotation of the connector at a height position farther away may be limited to the interference avoidance range. In addition, when avoiding interference of the connecting tool with respect to the object when the connecting tool rises from below the adjacent height area and moves to the adjacent height area, the rotation restricting unit is provided below the adjacent height area. The range of rotation of the connector at a height position farther away may be limited to the interference avoidance range.

  Even with these configurations, since the rotational position of the connector can be corrected to a position that does not interfere with the object before the connector reaches the adjacent height region, the connector interferes with the object. Can be obtained.

  Further, when restricting the rotation of the connector, the rotation restricting unit may allow the rotation of the connector so that the connector does not enter the interference range where the connector interferes with the object.

DESCRIPTION OF SYMBOLS 1 Counterweight attaching / detaching device 2 Elevating device 3 Interference avoiding device 4 Hydraulic cylinder 5 Connecting tool 6 Connecting member 16 Piston rod 25 Rotation restricting part 114 Mast 120 Guy link (object)

Claims (7)

A counterweight attachment / detachment device for attaching / detaching a counterweight to / from a swing frame of an upper swing body of a construction machine,
An elevating device that is provided on the upper revolving unit and that elevates the counter weight between a mounting position with respect to the revolving frame and a removal position below the mounting position;
An interference avoiding device for avoiding interference between a predetermined object on the upper revolving structure adjacent to the elevating device and the elevating device,
The elevating device is a hydraulic cylinder provided on the upper rotating body so as to expand and contract in the vertical direction, and has a piston rod that moves up and down, and a piston cylinder that extends radially outward from the piston rod. A connected connecting tool that moves up and down through an adjacent height area that is a height area adjacent to the object as the piston rod moves up and down, and as the connecting tool moves up and down A connecting member that connects the connecting tool and the counterweight so that the counterweight moves up and down,
The connection tool is configured to be rotatable around the central axis of the piston rod together with the piston rod, and at least a part of the connection tool is provided in the rotation range around the central axis of the piston rod in the adjacent height region. And an interference range, which is a rotation range in which the connector interferes with the object when entering the object, and when the connector is the object when at least a part of the connector enters the adjacent height region. And an interference avoidance range, which is a rotation range that does not interfere with
The interference avoiding device includes a rotation restricting unit that restricts a rotation range of the connecting device to the interference avoiding range at any height position until the connecting device reaches the adjacent height region by ascending or descending. , Counter weight attaching and detaching device.   The rotation restricting unit is configured to reduce the rotation range of the connection tool to the interference avoidance range in a state where at least a part of the connection tool enters the adjacent height area in a process of moving the connection tool to the adjacent height area. The counterweight attaching / detaching apparatus according to claim 1, wherein the counterweight is limited to within.   The rotation restricting section is configured to abut on the connecting tool when the connecting tool is at an interference avoiding position that is a rotational position before the object interferes with the object, so that the connecting tool moves beyond the interference avoiding position and the object is stopped. The counterweight attachment / detachment device according to claim 1 or 2, further comprising a rotation preventing portion configured to prevent rotation of the connection tool toward the object side.   The rotation restricting portion is configured to abut the connector when the connector rotated toward the object beyond the interference avoidance position moves toward the adjacent height region, thereby causing the connector to abut. The counterweight attaching / detaching apparatus according to claim 3, further comprising a guide surface for guiding to the interference avoiding position.   The counterweight attaching / detaching apparatus according to claim 4, wherein the guide surface has an inclination that converts a movement of the connector toward the adjacent height region into a rotation of the connector toward the interference avoidance position. The connecting device has a first portion extending from the piston rod to one side along a radial direction of the piston rod, and a second portion extending from the piston rod to an opposite side to the first portion,
The rotation preventing portion includes a first blocking portion that prevents rotation of the connecting device by contacting the first portion, and a second blocking portion that prevents rotation of the connecting device by contacting the second portion. The counterweight attaching / detaching apparatus according to any one of claims 3 to 5, comprising: The construction machine is an undulating member that is provided on the turning frame so as to be able to undulate and suspends a suspended load, a mast provided on the turning frame behind the undulating member, a tip of the mast, and the undulating member. A crane with a guy link that connects
The counterweight attaching / detaching device is arranged within a width of the turning frame,
The counterweight attaching / detaching apparatus according to any one of claims 1 to 6, wherein the target object is the guy link in a retracted state arranged along a mast that has fallen on the turning frame.

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