JP2016055935A - Work machine, counterweight device, and method for attachment of counterweight device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve efficient attachment/detachment of a counterweight device.SOLUTION: A counterweight device is equipped with: an upper engagement part which can engage with a hoist unit provided on an upper revolving structure; a weight side lock device which temporarily fixes the counterweight device to a revolving frame at a height position where the counterweight device is elevated by the hoist unit while bringing the hoist unit and the upper engagement part into contact with each other; a lower engagement part which is provided below the upper engagement part and can engage with the hoist unit in the state that the counterweight device is temporarily fixed to the revolving frame by the weight side lock device; and a weight side stationery part which fixes the counterweight device to a rear end of the revolving frame at a height position where the counterweight device is further elevated by the hoist unit while bringing the hoist unit and the lower engagement part into contact with each other.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a work machine, a counterweight device, and a counterweight device mounting method.

  In a work machine such as a crawler crane, a counterweight device is attached to the rear end of the revolving frame in order to ensure the stability of the machine body during work. In order to reduce the transport weight for transporting the work machine, the counterweight device is removed from the swivel frame. A device in which such a counterweight device is attached / detached by a counterweight attaching / detaching device provided on a revolving frame is known (see, for example, Patent Document 1).

JP 2007-31005 A

  However, in the above-mentioned patent document, in order to attach and detach the counterweight device, it is necessary to work such as raising and lowering the boom, raising and lowering the counterweight attachment and detachment device, and changing the pendant rope. ,troublesome.

(1) A work machine according to a first aspect of the present invention relates to an upper swing body having a swing frame, a counterweight device that is detachably attached to a fuselage-side fixing portion provided at a rear end of the swing frame, and a counterweight device. An elevating device provided on the upper swing body, which has a machine-side engaging portion that can be combined, and raises and lowers the counterweight device engaged with the airframe-side engaging portion by raising and lowering the airframe-side engaging portion; A fuselage-side engagement portion attached to the upper swing body and an engagement portion provided in the counterweight device, and when the counterweight device is placed on the ground, the fuselage-side engagement portion lowered by the lifting device And a locking device for temporarily fixing the counterweight device to the turning frame by being locked to the airframe side locking portion, the airframe side engaging portion and the upper engaging portion, Engage the lifting equipment A weight-side locking device for temporarily fixing the counterweight device to the revolving frame at a height position where the counterweight device is raised, and an engagement portion provided in the counterweight device, the weight-side locking device The lower engagement portion engageable with the airframe side engaging portion lowered by the elevating device in a state where the counterweight device is temporarily fixed to the turning frame by engaging the airframe side engaging portion, and the airframe side fixing portion Is a fixing portion for fixing the counterweight device to the rear end of the revolving frame, and the counterweight device is further raised by the lifting device by engaging the airframe side engaging portion and the lower engaging portion. A weight-side fixing portion that fixes the counterweight device to the rear end of the turning frame at the height position.
(2) The invention according to claim 2 is the work machine according to claim 1, wherein the lift of the lifting device includes a counterweight device mounted on the ground and a counterweight device attached to the rear end of the swivel frame. Is smaller than the difference in height.
(3) The invention according to claim 3 is the work machine according to claim 1 or 2, wherein the weight side locking device is locked to the fuselage side locking portion, and the counterweight device is temporarily fixed to the revolving frame. And a retracted posture in which the weight side locking device is retracted by releasing the locking to the body side locking portion.
(4) According to a fourth aspect of the present invention, in the work machine according to any one of the first to third aspects, the lifting device is provided at the rearmost among the plurality of winch devices provided in the upper swing body. The winch device is disposed below the winch device.
(5) A work machine according to a fifth aspect of the invention includes an upper swing body having a swing frame, a counterweight device that is detachably attached to a fuselage-side fixing portion provided at a rear end of the swing frame, and an upper swing body that is attached to the upper swing body. A lifting / lowering hydraulic cylinder, a cylinder-side engaging portion that moves up and down by expansion and contraction of a cylinder rod of the lifting / lowering hydraulic cylinder, a body-side locking portion that is attached to the upper swing body, and an engagement portion provided in the counterweight device When the counterweight device is placed on the ground, the upper engagement portion that can be engaged with the cylinder side engagement portion that is extended by lowering the cylinder rod of the lifting hydraulic cylinder, and the body side engagement portion Is a locking device for temporarily fixing the counterweight device to the turning frame by engaging the cylinder side engaging portion and the upper engaging portion. A weight-side locking device that temporarily fixes the counterweight device to the revolving frame at a height position where the cylinder weight of the cylinder is retracted and the counterweight device is pulled up, and an engaging portion provided in the counterweight device, With the weight side locking device locked to the airframe side locking portion and the counterweight device temporarily fixed to the swing frame, the cylinder rod of the lifting hydraulic cylinder is extended and engaged with the cylinder side engaging portion. A lower engaging portion that can be engaged, and a fixing portion that fixes the counterweight device to the rear end of the revolving frame by fixing to the airframe side fixing portion, and engages the cylinder side engaging portion and the lower engaging portion. The counter weight device is fixed to the rear end of the swivel frame at the height position where the cylinder rod of the lifting hydraulic cylinder is retracted and the counter weight device is further lifted. And a weight-side fixing portion.
(6) A counterweight device according to a sixth aspect of the present invention is a counterweight device that is detachably attached to a fuselage-side fixing portion provided at a rear end of a swing frame of an upper swing body of a work machine, and is attached to the upper swing body. The counterweight device is swiveled at a height position where the counterweight device is lifted by the lifting device by engaging the upper engaging portion that can be engaged with the installed lifting device, and the lifting device and the upper engaging portion. A weight side locking device temporarily fixed to the frame, and a state in which the counterweight device is temporarily fixed to the turning frame by the weight side locking device, and can be engaged with the lifting device, and is provided below the upper engaging portion. The counterweight device is fixed to the rear end of the swivel frame at a height position where the lower weight engaging portion, the lifting device and the lower engaging portion are engaged to further raise the counterweight device by the lifting device. And a weight side fixing portion.
(7) According to a seventh aspect of the present invention, in the counterweight device according to the sixth aspect, the weight side locking device stores a temporary fixing posture for temporarily fixing the counterweight device to the turning frame, and a weight side locking device. The retracted posture can be taken.
(8) In the counterweight device mounting method according to the eighth aspect of the present invention, the machine body side engaging portion of the lifting device provided in the upper swing body having the swing frame is lowered and placed on the ground behind the swing frame. Engage the upper engagement part of the counterweight device with the airframe side engagement part, raise the counterweight device to a predetermined height with the lifting device, and temporarily fix the counterweight device raised to the predetermined height to the swivel frame Then, the engagement between the airframe side engaging portion and the upper engaging portion is released, the airframe side engaging portion is lowered, and the lower engaging portion of the counterweight device temporarily fixed to the turning frame is moved to the airframe side engaging portion. The counterweight device is raised to the mounting height of the turning frame by the lifting device, and the counterweight device raised to the mounting height is attached to the rear end of the turning frame.
(9) A work machine according to a ninth aspect of the present invention relates to an upper swing body having a swing frame, a counterweight device detachably attached to a fuselage side fixing portion provided at a rear end of the swing frame, and a counterweight device. A lifting device provided on the upper swing body, which has a body-side engaging portion that can be engaged, and lifts and lowers the counterweight device engaged with the body-side engaging portion by raising and lowering the body-side engaging portion. The counterweight device has an upper first base weight and a lower second base weight that are vertically overlapped and can be fixed and released from each other, and the first base weight and The second base weights can be fixed and released from each other in a first relative posture close to each other in the vertical direction, and can be mutually fixed in a second relative posture separated from each other in the vertical direction. The first base weight is composed of a weight side fixing portion for fixing the counterweight device to the rear end of the revolving frame, a first base weight, and a second base weight. When fixed to each other in the second relative posture and placed on the ground, the first engagement portion engageable with the airframe side engagement portion lowered by the elevating device is provided. The base weight is lowered by the lifting device when the weight-side fixing portion is fixed to the fuselage-side fixing portion with the first base weight and the second base weight taking the second relative posture. A second engaging portion that can be engaged with the airframe side engaging portion; the first base weight and the second base weight are in the second relative posture; and the weight side fixing portion is the airframe. Fixed to the side fixing portion and engaged with the second engaging portion. When the airframe side engaging portion which is raised in the lifting device, taking the first relative orientation.

According to the present invention, when attaching and detaching the counterweight device, work such as raising and lowering the boom, raising and lowering the counterweight attachment and detachment device, and changing the pendant rope as in the prior art becomes unnecessary. The attachment / detachment work becomes efficient.
In addition, according to the present invention, since the lifting device that lifts and lowers the counterweight device can be reduced in size, the space above the lifting device can be used effectively.
Moreover, according to this invention, the operation | work by an auxiliary crane is unnecessary, an auxiliary crane can be used for another operation | work, and the working efficiency in a work site can be improved.

It is a perspective view of the mobile crane as an example of a working machine. It is the perspective view which looked at the upper turning body of the crane with which the counterweight apparatus was attached from diagonally backward. It is the perspective view which looked at the upper turning body of the crane from which the counterweight apparatus was removed from diagonally backward. It is the perspective view to which the vicinity of the receiving bracket was expanded. It is an external appearance perspective view of a raising / lowering cylinder. It is a perspective view of a counterweight apparatus. It is a perspective view of a base weight. It is a perspective view of a base weight. It is a perspective view of a base weight. It is a figure explaining the attachment operation | work of a counterweight apparatus. It is a figure explaining the attachment operation | work of a counterweight apparatus. It is a figure explaining the attachment operation | work of a counterweight apparatus. It is a figure explaining the attachment operation | work of a counterweight apparatus. It is the perspective view to which the vicinity of the receiving bracket was expanded. It is a figure explaining the attachment operation | work of a counterweight apparatus. It is a figure explaining the attachment operation | work of a counterweight apparatus. It is a figure explaining the attachment operation | work of a counterweight apparatus. It is the perspective view which looked at the upper revolving structure of the mobile crane of 2nd Embodiment from diagonally back. It is the perspective view which looked at the upper turning body of the crane from which the counterweight apparatus was removed from the diagonally rear upper side. It is the perspective view which looked at the upper turning body of the crane from which the counterweight apparatus was removed from diagonally backward lower side. It is an external appearance perspective view of a counterweight apparatus. It is an external appearance perspective view of a counterweight apparatus. It is an external appearance perspective view of the 1st base weight and the 2nd base weight. It is an external appearance perspective view of the 1st base weight and the 2nd base weight. It is a figure explaining the attachment operation | work of a counterweight apparatus. It is a figure explaining the attachment operation | work of a counterweight apparatus. It is a figure explaining the attachment operation | work of a counterweight apparatus. It is a figure explaining the attachment operation | work of a counterweight apparatus. It is a figure explaining the attachment operation | work of a counterweight apparatus. It is a figure explaining the attachment operation | work of a counterweight apparatus. It is a figure explaining the attachment operation | work of a counterweight apparatus. It is a figure explaining the attachment operation | work of a counterweight apparatus.

--- First embodiment ---
With reference to FIGS. 1-17, 1st Embodiment of the working machine by this invention is described. FIG. 1 is a perspective view of a mobile crane as an example of a work machine according to the present embodiment. The mobile crane 10 includes a crane body 11 and a boom 4 that is rotatably attached to the crane body 11. For convenience of explanation, the front-rear direction, the up-down direction, and the left-right direction are defined as shown in each drawing.

  The crane body 11 includes a lower traveling body 1 having a crawler belt 106, and an upper revolving body 3 provided on the lower traveling body via a swirling wheel so as to be able to swivel. The upper swing body 3 includes a swing frame 3a. For example, a front drum 5, a rear drum 6, and a third drum 7 are mounted on the upper swing body 3 as a winch device.

  Frame beams 101 (see FIG. 3) extending in the front-rear direction are provided on both the left and right sides of the turning frame 3a. A boom mounting portion 31 that pivotally supports the boom 4 is provided on the front side of the revolving frame 3a. The multistage boom, that is, the telescopic boom 4 that can be expanded and contracted, is pivotally supported by a boom mounting portion 31 by a boom pin 81. Further, a boom cylinder (not shown) for raising and lowering the telescopic boom 4 is attached to the revolving frame 3a.

  The upper swing body 3 is provided with a cab 32 in front of the right side. A machine room 33 is provided behind the cab 32. A hydraulic oil tank 34 is provided at the left rear portion of the upper swing body 3. A counterweight device 200 is attached to the rear end of the swivel frame 3a. The counterweight device 200 will be described in detail later.

  FIG. 2 is a perspective view of the upper swing body 3 of the crane 10 to which the counterweight device 200 is attached as viewed obliquely from the rear. FIG. 3 shows the upper swing body 3 of the crane 10 from which the counterweight device 200 has been removed. It is the perspective view seen from diagonally backward. In FIG. 3, the cover 195 at the rear of the machine body is removed. As shown in FIG. 3, the revolving frame 3a has two frame beams 101 extending in the front-rear direction of the crane on both the left and right sides as described above.

  A third drum support frame 107 is erected above the pair of left and right frame beams 101. Airframe side fixing plates 110 for fixing the counterweight device 200 to the pair of frame beams 101 are provided below the respective frame beams 101. A receiving bracket 140 for temporarily fixing the counterweight device 200 is attached to each side surface of each frame beam 101 in the left-right direction.

  The third drum support frame 107 includes two side plates 107a erected on the upper surface of each frame beam 101, and two connection plates 107b that connect the two side plates 107a at the front and rear portions. Have An attachment portion 193 for attaching the third drum 7 is provided on the upper portion of the third drum support frame 107. As shown in FIG. 2, a cover 195 that covers the rear surface of the rear connection plate 107 b and the rear end of each frame beam 101 is attached to the rear portion of the third drum support frame 107. The cover 195 is provided with an opening / closing door 195a, and the opening / closing door 195a is opened when the counterweight device 200 is attached or detached. FIG. 2 shows a state in which the right door 195a of the left and right doors 195a is half open.

  Each of the two side plates 107a is provided with a mounting portion 108 of the lifting / lowering cylinder 120 of the counterweight device 200 on the outer side surface in the left-right direction. The attachment portion 108 supports the end portion on the bottom chamber side with the cylinder rod side of the elevating cylinder 120 facing downward. The lifting cylinder 120 will be described in detail later.

  The fuselage-side fixing plate 110 is a plate-like member that stands downward at the bottom of each frame beam 101 and extends in the front-rear direction, and includes fixing pin insertion holes 111, 112, 114 and positioning notches. Part 113.

FIG. 4 is an enlarged perspective view of the vicinity of the receiving bracket 140 of the counterweight device 200 on the right rear side of the main frame, and shows a state in the middle of the mounting work of the counterweight device 200. The receiving brackets 140 are provided at a total of four locations, two at a distance in the front-rear direction, on the outer side surface of each frame beam 101 in the left-right direction. That is, a set of a pair of receiving brackets 140 provided in the front-rear direction is disposed on each of the left and right sides.
2 and 3, the front receiving bracket 140 is not shown because it is hidden behind other members.

  The pair of receiving brackets 140 is a body side locking portion for temporarily fixing the counterweight device 200 by receiving and locking the locking pin 242 of the temporary fixing link member 240 of the counterweight device 200 from below. is there. Each receiving bracket 140 includes two receiving plates 141 that are spaced apart in the front-rear direction and face each other, and a fixing portion 143 that fixes the receiving plate 141 to the laterally outer side surface of the frame beam 101. An upper portion of the receiving plate 141 is a substantially U-shaped notch, and a locking portion 142 that receives the locking pin 242 of the temporary fixing link member 240 from below is provided. The receiving bracket 140 also has a function of guiding the guide plate 202 of the counterweight device 200 when the counterweight device 200 is attached. The function of the receiving bracket 140 guiding the guide plate 202 will be described in detail later.

  FIG. 5 is an external perspective view of the lifting cylinder 120. The lifting cylinder 120 shown in FIG. 5 is the lifting cylinder 120 attached to the right side of the machine. The lifting cylinder 120 is attached to the mounting portion 108 in the front-rear direction, the left-right direction, and the up-down direction shown in FIG. It corresponds to each direction of the crane 10 in the state. The elevating cylinder 120 is, for example, a hydraulic cylinder, and an elevating engagement portion 121 that is an airframe side engaging portion that can be engaged with the counterweight device 200 is provided at the tip of the cylinder rod. For example, a clevis-type attachment 120a is provided at the bottom end of the lift cylinder 120, and the lift cylinder 120 is attached to the machine-side attachment 108 with the attachment 120a.

  The raising / lowering engaging part 121 is attached to the tip of the cylinder rod and is provided with two guide plates 122 facing each other in a state of being separated in the left-right direction, two engaging pins 123, and two And a guide pin 129. The left and right guide plates 122 are provided with through holes 122a through which the engagement pins 123 can be inserted and removed on the front side and the rear side. The engagement pin 123 is a shaft-like member that can be inserted into and removed from the through hole 122a. The engagement pin 123 is attached to an engagement pin attachment portion 124 attached to the left guide plate 122 so as to be movable in the left-right direction. That is, the engagement pin mounting portion 124 is provided with a lever 125 that rotates in the left-right direction around a pin extending in the front-rear direction. The engagement pin 123 is interlocked with the rotation of the lever 125. It is configured to move in the left-right direction. A grip portion 126 is attached to the lever 125. When the operator moves the grip portion 126 by hand and rotates the lever 125, the engagement pin 123 moves in the left-right direction and is inserted into the through hole 122a. It is pulled out.

  The guide pin 129 is a pin that extends in the left-right direction, and is attached to the guide plate 122 before and after the tip of the cylinder rod is sandwiched.

  In the present embodiment, it is necessary to attach the elevating cylinder 120 to the attachment portion 108 provided below the third drum 7 so that the elevating cylinder 120 does not interfere with the third drum 7. Therefore, the total length of the lifting cylinder 120 is limited, and the stroke of the lifting cylinder 120 is limited. In the present embodiment, the stroke of the lifting cylinder 120 is limited to about half the height difference between the counterweight device 200 placed on the ground and the counterweight device 200 attached to the rear end of the upper swing body 3. The That is, the lifting capacity of the counterweight device 200 by the lifting cylinder 120 is smaller than the difference in height.

--- Counterweight device 200 ---
FIG. 6 is a perspective view of the counterweight device 200, and FIGS. 7 to 9 are perspective views of the base weight 201. The counterweight device 200 includes a base weight 201 and a counterweight 281 loaded on the base weight 201. A plurality of counterweights 281 can be stacked in each of the right placement area 201R and the left placement area 201L (FIG. 7) of the base weight 201. For example, FIG. 6 illustrates an example in which two counterweights 281 are stacked in each of the left and right placement areas 201L and 201R of the base weight 201. In the counterweight device 200, the total weight of the counterweight device 200 can be adjusted by appropriately adjusting the number of counterweights 281 to be loaded. The base weight 201, the counterweight 281 and the stacked counterweights 281 are fixed by, for example, fixing bolts 285.

  A guide plate 202 is erected on the left side of the right placement area 201R and on the right side of the left placement area 201L. The guide plate 202 is a member guided by the receiving bracket 140 when the counterweight device 200 is attached, and includes a front guide plate 202F and a rear guide plate 202R on the left and right. The guide plates 202F and 202R are opposed to each other while being separated from each other in the front-rear direction. The right guide plates 202F and 202R and the left guide plates 202F and 202R are symmetrical in shape and arrangement position. The front guide plate 202F and the rear guide plate 202R are symmetrical in shape. In the following description, the front and rear guide plates 202F and 202R will be described as the guide plate 202 without adding F and R to the reference numerals when not distinguished from each other.

  An elongated hole 232 that extends obliquely in the up-down direction is provided on the upper portion of the guide plate 202, and a temporary fixing link member 240 is attached to the elongated hole 232. The long hole 232 extends in the diagonally up and down direction so that the lower part is located outside in the left-right direction and the upper part is located inside in the left-right direction. At the upper end of the guide plate 202, a notch 202a (see FIG. 14) is provided for receiving the locking pin 242 of the temporary fixing link member 240 when the temporary fixing link member 240 is not used. The guide plate 202 is provided with a regulation pin 233 for regulating the inclination of the temporary fixing link member 240 in the temporary fixing posture. The restriction pin 233 protrudes from the front and rear surfaces of the guide plates 202F and 202R. The restriction pin 233 limits the rotation range of the temporary fixing link member 240 as will be described later.

  4, the temporary fixing link member 240 is a member for temporarily fixing the counterweight device 200, and includes a pair of link plates 241, a locking pin 242, a grip portion 243, and an attachment pin. 244. FIG. 4 shows a state when the temporary fixing link member 240 is not used. The posture of the temporary fixing link member 240 at this time is referred to as a retracted posture. Each link plate 241 is a plate-like member extending in the vertical direction, and is disposed so as to sandwich the guide plate 202. An attachment pin 244 passes through the lower side of each link plate 241. The mounting pin 244 also penetrates the long hole 233 of the guide plate 202. The pair of guide plates are movable along the elongated hole 233 while being guided by the mounting pins 244. Each link plate 241 is provided with an abutting portion 245 for abutting against the restriction pin 233 in a temporarily fixed posture to restrict the inclination of the temporary fixing link member 240.

  A locking pin 242 extending in the front-rear direction passes through the upper portion of each guide plate 241. The locking pin 242 protrudes in front of the front link plate 241 and rearward of the rear link plate 241. The grip portion 243 is a member for the operator to move the temporary fixing link member 240 along the long hole 233 and is attached to each link plate 241.

  As well shown in FIG. 8, on the upper surface of the base weight 201, engaging plates 210F and 210R are erected on the opposing surfaces of the opposing guide plates 202F and 202R, respectively. The engagement plates 210F and 210R are also erected from the upper surface of the base weight 201. Between the pair of engaging plates 210F and 210R provided upright on the opposing surfaces of the guide plates 202F and 202R, a rod intrusion path of the elevating cylinder 120 shown in FIG. 5 is provided, and a pair of guide plates 122 provided at the tip of the rod. The lifting and lowering cylinder 120 is guided to extend and retract so that the engagement plates 210 </ b> F and 210 </ b> R are inserted into the front and rear gaps. That is, the pair of engagement plates 210 </ b> F and 210 </ b> R function as guide members for the lifting cylinder 120.

  In the following description, the front and rear engagement plates 210F and 210R will be described as the engagement plate 210 without adding F or R to the reference numerals when not distinguished from each other.

  An engagement elongated hole 211 extending in the vertical direction is provided at the upper part of each engagement plate 210, and an engagement hole 212 is provided at the lower part of the engagement plate 210. When the counterweight device 200 is attached, the engagement pin 123 of the elevating engagement portion 121 provided at the tip of the cylinder rod of the elevating cylinder 120 is inserted into and extracted from the engagement elongated hole 211 and the engagement hole 212.

As well shown in FIGS. 8 and 9, a pair of weight side fixing portions 220 </ b> L and 220 </ b> R are provided on the upper surface of the base weight 201 in a bilaterally symmetrical manner. The weight side fixing portions 220L and 220R are portions for fixing the counterweight device 200 to the airframe side fixing plate 110 on the airframe side. Each of the right weight-side fixing portion 220R and the left weight-side fixing portion 220L has two weight-side fixing plates 220a that are spaced apart from each other in the left-right direction.
In the following description, when the left and right weight side fixing portions 220R and 220L are not distinguished from each other, the weight side fixing portion 220 will be described without adding R and L to the reference numerals.

  Each weight-side fixing plate 220 a is erected on the upper surface of the base weight 201. As shown in FIG. 8, through-holes 220b are provided in the front part and the rear part of each of the two weight-side fixing plates 220a facing left and right. A fixing pin 221 extending in the left-right direction is inserted into the through hole 220b so as to be insertable / removable. The fixing pin 221 is a pin for fixing the counterweight device 200 to the airframe side fixing plate 110 on the airframe side, and has a gripping part 221a attached thereto.

  A guide pin 223 extending in the left-right direction is attached between the two weight-side fixing plates 220a facing each other on the left and right. On the upper surface of the base weight 201 behind the weight side fixing plate 220a, a guide plate 230 extending in a direction orthogonal to the weight side fixing plate 220a is erected. The guide plate 230 is provided with a slit portion 231 that extends downward from the upper end, and the position of the slit portion 231 in the left-right direction is between two weight-side fixing plates 220a that face each other on the left and right.

  As well shown in FIG. 9, a guide plate 292 that is a plate-like member and has a T-shape in plan view is erected on the front side of the upper surface of the base weight 201 in the horizontal direction. When the counterweight device 200 is attached, the guide plate 292 is guided by a guide portion (not shown) provided on the machine body side to position the counterweight device 200.

---- Installation of counterweight device 200 ---
In the mobile crane 10 of the present embodiment, due to restrictions on transportation weight, length, etc., for example, the crane body 11 is disassembled into the crane body 11, the boom 4 and the counterweight device 200, and each is transported separately. Reassembled. In the present embodiment, the counterweight device 200 is attached to the upper swing body 3 as follows. First, the base weight 201 is placed on the ground of the assembly site of the crane at the work site. Then, as shown in FIG. 6, a counterweight 281 is loaded on the base weight 201 and fixed with fixing bolts 285.

  The crane body 11 is moved to the mounting position of the counterweight device 200 so that the counterweight device 200 can be pulled up using the lifting cylinder 120. FIG. 10 is a perspective view showing a state after the crane body 11 is moved to the mounting position of the counterweight device 200. For convenience of explanation, the description of the counterweight 281 on the right side and the cover 195 at the rear of the machine body is omitted in each drawing described below.

  By operating the grip 126 (see FIG. 5) of the elevating engagement portion 121 at the tip of the elevating cylinder 120, the engaging pin 123 is extracted from the through hole 122a, and then the cylinder rod of the elevating cylinder 120 is extended, The elevating engagement portion 121 at the tip is lowered. At this time, the two guide plates 122 provided opposite to each other are guided by the engagement plates 210F and 210R relatively entering the gap. At this time, of the guide pins 129 of the lifting engagement portion 121, the front guide pin 129 is guided by the rear end surface 210a of the front engagement plate 210F, and the rear guide pin 129 is engaged by the rear engagement. Guided by the front end surface 210a of the plate 210R (see FIGS. 5 and 8). In addition, the drive pressure oil of the raising / lowering cylinder 120 is supplied from the hydraulic circuit not shown of the crane main body 11, for example.

  The cylinder rod of the elevating cylinder 120 is extended until the through hole 122a of the elevating engagement portion 121 overlaps with the engagement elongated hole 211 of the engagement plate 210 in a side view. Thereafter, the extension of the cylinder rod is stopped, and the gripping portion 126 (see FIG. 5) of the elevating engagement portion 121 is operated to connect the engagement pin 123 to the through hole 122a and the engagement length as shown in FIG. Insert through hole 211. As a result, the elevating engagement portion 121 and the upper portion of the engagement plate 210 are engaged by the engagement pin 123.

  The counterweight device 200 is raised by retracting the cylinder rod of the elevating cylinder 120. FIG. 12 is a perspective view showing a state in which the cylinder rod of the elevating cylinder 120 is most retracted by engaging the elevating engagement portion 121 and the upper portions of the engagement plates 210F and 210R. 4 is an enlarged perspective view of the vicinity of the receiving bracket 140 in FIG. When the counterweight device 200 is raised by retracting the cylinder rod of the elevating cylinder 120, guide plates 202F and 202R are inserted and guided in the gap between the two receiving plates 141 of the receiving bracket 140.

  After the cylinder rod of the elevating cylinder 120 is most retracted, the gripping portion 243 of the temporary fixing link member 240 provided in the counterweight device 200 is operated to move the temporary fixing link member 240 along the elongated hole 232 of the guide plate 202. Then, the contact portion 245 is brought into contact with the restriction pin 233. As a result, the temporary fixing link member 240 is locked by the restriction pin 233 in a posture that is inclined obliquely so that the locking pin 242 is positioned above the locking portion 142 of the receiving plate 141. The posture of the temporary fixing link member 240 at this time is referred to as a temporary fixing posture. When the cylinder rod of the elevating cylinder 120 is most retracted, the locking pin 242 of the temporary fixing link member 240 and the locking portion 142 of the receiving plate 141 are separated from each other.

  If the cylinder rod of the elevating cylinder 120 is slightly extended from this state, the counterweight device 200 is lowered, and the locking pin 242 of the temporary fixing link member 240 is received by the receiving plate 141 as shown in FIGS. The abutment portion 142 is abutted and engaged. As a result, the counterweight device 200 is suspended from the receiving bracket 140 by the temporarily fixing link member 240 and temporarily fixed to the upper swing body 3. The height position of the counterweight device 200 at this time is called a temporarily fixed position. 13 is a perspective view of the upper swing body 3 of the crane 10 to which the counterweight device 200 is temporarily fixed as viewed obliquely from the rear. FIG. 14 is an enlarged perspective view of the vicinity of the receiving bracket 140 in FIG. It is. Further, the posture of the temporary fixing link member 240 shown in FIGS. 13 and 14 is the temporary fixing posture described above.

  Next, the gripping portion 126 (see FIG. 5) of the elevating engagement portion 121 of the elevating cylinder 120 is operated to extract the engaging pin 123 from the through hole 122a and the engagement elongated hole 211, and then the cylinder of the elevating cylinder 120 Extend the rod. The cylinder rod of the elevating cylinder 120 is extended and stopped until the through hole 122a of the elevating engagement portion 121 overlaps with the engagement hole 212 provided on the lower side of the engagement plates 210F and 210R in a side view. And the holding part 126 of the engaging part 121 for raising / lowering is operated, and the engaging pin 123 is inserted in the through-hole 122a and the engaging hole 212 as shown in FIG. As a result, the elevating engagement portion 121 and the lower portion of the engagement plate 210 are engaged by the engagement pin 123.

  By operating the gripping part 221a, the fixing pin 221 is extracted from the through hole 220b of the weight side fixing plate 220a. Then, the counterweight device 200 is raised by retracting the cylinder rod of the lifting cylinder 120. In the ascending process of the counterweight device 200, the vicinity of the rear end of the fuselage-side fixing plate 110 enters the slit portion 231 of the guide plate 230, and the counterweight device 200 is guided. By this operation, the airframe side airframe side fixing plate 110 enters between the two weight side fixing plates 220a facing each other. At this time, the guide pin 223 of the weight side fixing portion 220 is guided by the positioning notch portion 113 of the body side fixing plate 110. In addition, the guide plate 292 of the base weight 201 is guided by a guide member (not shown) on the machine body side while the counterweight 200 is raised.

  Thus, the counterweight device 200 is positioned with respect to the upper swing body 3, and the fixing pin insertion holes 112 and 114 of the airframe side airframe side fixing plate 110 and the through hole 220b of the weight side fixing plate 220a are viewed in side view. Overlap. Thereafter, the counterweight device 200 is fixed to the upper swing body 3 by operating the grip portion 221a to insert the fixing pin 221 into the fixing pin insertion holes 112 and 114 and the through hole 220b and preventing the removal. The height position of the counterweight device 200 at this time is called a fixed position. FIG. 16 is a perspective view of the upper swing body 3 of the crane 10 to which the counterweight device 200 is fixed as viewed obliquely from the rear.

  In this state, the temporarily fixing link member 240 remains in the temporarily fixed posture described above. Therefore, by operating the grip portion 243, the temporary fixing link member 240 is moved obliquely downward along the elongated hole 232 of the guide plate 202, and the locking pin 242 is cut out as shown in FIG. To lock. Thereby, the posture of the temporary fixing link member 240 becomes the retracted posture. In addition, in the state shown in FIG. 16, the opening / closing door 195a of the cover 195 (not shown) remains open for the work of attaching the counterweight device 200, so the opening / closing door 195a is closed.

  Thus, the work for attaching the counterweight device 200 is completed, and the state shown in FIG. 2 is obtained. As described above, in the present embodiment, the entire process of lifting the counterweight device 200 placed on the ground to the fixed position is a two-stage process including the process of lifting the temporary weight position to the fixed position and the process of lifting the temporary weight position to the fixed position. It is divided into. In addition, the counterweight device 200 is pulled up by using an elevating cylinder 120 having a stroke smaller than the entire stroke, for example, about a half stroke. Note that the removal work of the counterweight device 200 from the upper swing body 3 may be performed in the reverse order of the above-described work of attaching the counterweight device 200.

  That is, in the mobile crane 10 of the present embodiment, the counterweight device 200 that has the lifting engagement portion 121 and that is engaged with the lifting engagement portion 121 by moving the lifting engagement portion 121 up and down is used. A lifting cylinder 120 that moves up and down is provided on the upper swing body 3. In the mobile crane 10 of the present embodiment, the upper swing body 3 is provided with a receiving bracket 140 that is a machine body side locking portion for temporarily fixing the counterweight device 200. In the mobile crane 10 of the present embodiment, the upper revolving body 3 is provided with the airframe side fixing plate 110 that is an airframe side fixing portion that fixes the counterweight device 200 to the rear end of the revolving frame 3a.

  In the mobile crane 10 of the present embodiment, the engagement elongated hole 211 that is the upper engagement portion provided in the counterweight device 200 is provided in the upper portion of the engagement plate 210. Engagement length is set so that the engagement elongate portion 121 of the counterweight device 200 placed on the ground is lowered by the elevating cylinder 120 and the engagement elongate hole 211 can be engaged. The arrangement position of the hole 211 is determined. In the mobile crane 10 of the present embodiment, the counterweight device 200 is at a height position where the lifting / lowering cylinder 120 is lifted by engaging the lifting / lowering engaging portion 121 and the engagement elongated hole 211. The counterweight device 200 is provided with a temporary fixing link member 240 which is a locking device for temporarily fixing the frame to the revolving frame 3a.

  In the mobile crane 10 of the present embodiment, an engagement hole 212 that is a lower engagement portion provided in the counterweight device is provided in the lower portion of the engagement plate 210. In the state where the temporary fixing link member 240 is received and locked to the bracket 140 and the counterweight device 200 is temporarily fixed to the revolving frame 3a, the lifting engagement portion 121 and the engagement hole 212 lowered by the lifting cylinder 120 are formed. An arrangement position of the engagement hole 212 is determined so that the engagement is possible. In the mobile crane 10 of the present embodiment, the weight-side fixing portion 220 that is a fixing portion that fixes the counterweight device 200 to the rear end of the turning frame 3 a by fixing to the machine-side fixing plate 110 is attached to the counterweight device 200. Provided.

The mobile crane 10 of the present embodiment has the following operational effects.
(1) The lifting / lowering engagement portion 121 and the engagement elongated hole 211 are engaged with each other, and the counterweight device 200 placed on the ground is lifted by the lifting / lowering cylinder 120. Then, the temporary fixing link member 240 is received and locked to the bracket 140 so that the counterweight device 200 is temporarily fixed to the revolving frame 3a. Then, the temporarily fixed counterweight device 200 is further lifted by the lift cylinder 120 by engaging the engagement hole 212 of the temporarily fixed counterweight device 200 with the lifting engagement portion 121. . Thus, when attaching / detaching the counterweight device 200, operations such as raising / lowering the boom 4, raising / lowering the counterweight attachment / detachment device, and changing the pendant rope as in the prior art become unnecessary. The attachment / detachment work becomes efficient.

(2) As described above, each part is configured so that the counterweight device 200 placed on the ground can be lifted in two stages, and the counterweight device 200 placed on the ground and the upper swing body 3 A lifting cylinder 120 having a stroke smaller than the difference in height from the counterweight device 200 attached to the rear end is adopted. Thereby, since the length of the raising / lowering cylinder 120 can be shortened, the space above the attachment part 108 of the raising / lowering cylinder 120 can be used effectively. In the present embodiment, it is possible to prevent interference with the third drum 7 located in a space above the attachment portion 108 of the elevating cylinder 120. Therefore, it is advantageous in designing the mobile crane 10. Moreover, since the stroke of the raising / lowering cylinder 120 is small, the cost concerning the raising / lowering cylinder 120 can be reduced.

(3) Since the temporary fixing link member 240 is configured to be able to take the temporary fixing posture and the retracted posture, the temporary fixing link member 240 can be stably stored in the retracted posture when not in use.

(4) The elevating engagement portion 121 of the elevating cylinder 120 is lowered, and the engagement elongated hole 211 of the engagement plate 210 of the counterweight device 200 placed on the ground behind the revolving frame 3a and the elevating engagement The counterweight device 200 is raised to a predetermined height by the lifting cylinder 120 by engaging with the portion 121. Then, the counterweight device 200 raised to a predetermined height is temporarily fixed to the turning frame 3a, the engagement between the engagement elongated hole 211 and the lifting engagement portion 121 is released, and the lifting engagement portion 121 is The engagement hole 212 of the engagement plate 210 and the engagement part 121 for raising / lowering are engaged with each other, and the lifting / lowering cylinder 120 raises the counterweight device 200 to the mounting height to the turning frame 3a. The counterweight device 200 raised to the mounting height is attached to the rear end of the turning frame 3a. Thereby, the operation | work by an auxiliary crane is unnecessary, an auxiliary crane can be used for another operation | work, and the work efficiency in a work site can be improved.

--- Second Embodiment ---
A second embodiment of the work machine according to the present invention will be described with reference to FIGS. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and different points will be mainly described. Points that are not particularly described are the same as those in the first embodiment. In the present embodiment, the counter weight device mainly includes a first base weight and a second base weight that overlap each other, and the first base weight is attached to the second base weight when the counter weight device is attached. The first embodiment is different from the first embodiment in that the first base weight is temporarily fixed to the upper portion of the support plate that is erected on the second base weight while being spaced apart upward.

  FIG. 18 is a perspective view of the upper swing body 3 of the mobile crane 10 according to the second embodiment viewed obliquely from the rear. 19 is a perspective view of the upper swing body 3 of the crane 10 from which the counterweight device 300 has been removed as viewed obliquely from the upper rear side, and FIG. 20 is an upper swing body 3 of the crane 10 from which the counterweight device 300 has been removed. It is the perspective view which looked at from diagonally back lower side. In FIG. 18 and subsequent figures, description of portions not directly related to the description relating to the mounting of the counterweight device 300 is omitted.

  The upper and lower surfaces of the left and right frame beams 101 are integrally connected by a plate member 102, respectively. Each plate member 102 spaced in the vertical direction is provided with a through-hole penetrating in the vertical direction in the center in the left-right direction, and a guide pipe 103 extending in the vertical direction is attached to the through-hole.

  As shown in FIG. 20, a guide 293 that guides the counterweight device 300 when the counterweight device 300 is attached is provided in front of the lower plate member 102. The fuselage-side fixing plate 110 is provided with fixing pin insertion holes 112 and 114 and a positioning notch 113A.

  For example, as shown in FIG. 19, an elevating engagement portion 151 is attached to the tip of the cylinder rod of the elevating cylinder 120. The lifting engagement portion 151 includes two engagement plates 152 and a guide plate 153 that are provided to face each other while being separated in the left-right direction. The left and right engagement plates 152 are provided with through-hole holes 152a and 152b through which engagement pins 335 (to be described later) of the counterweight device 300 can be inserted and removed. The through long hole 152 a is provided in the upper part of the engagement plate 152, and the through hole 152 b is provided in the lower part of the engagement plate 152. The guide plate 153 is a member guided by a support plate 310 (to be described later) of the counterweight device 300 when the cylinder rod of the elevating cylinder 120 is expanded and contracted, and has a guide groove 153a.

--- Counterweight device 300 ---
FIG. 21 is an external perspective view of the counterweight device 300 according to the present embodiment, and shows a state in which the first base weight 301 and the second base weight 305 are closest to each other in the vertical direction. FIG. 22 is an external perspective view of the counterweight device 300 according to the present embodiment. The first base weight 301 is spaced upward from the second base weight 305 and is erected on the second base weight 305. The state which fixed the 1st base weight 301 to the upper part of the support plate 310 is shown. 23 and 24 are external perspective views of the first base weight 301 and the second base weight 305. FIG.

  As shown in FIG. 21, the relative posture of the first base weight 301 and the second base weight 305 when the first base weight 301 and the second base weight 305 are closest to each other in the vertical direction is the first relative weight. Called posture. Further, as shown in FIG. 22, the relative posture of the first base weight 301 and the second base weight 305 when the first base weight 301 is separated upward from the second base weight 305 is the second relative posture. Call it.

  The counterweight device 300 includes a first base weight 301, a second base weight 305, and a counterweight 281 loaded on the first base weight 301. A plurality of counterweights 281 can be stacked in each of the right mounting area 301R and the left mounting area 301L (FIGS. 23 and 24) of the first base weight 301. The first base weight 301, the counterweight 281 and the stacked counterweights 281 are fixed by, for example, a fixing bolt (not shown).

  On the left side of the right mounting area 301R and the right side of the left mounting area 301L, plates 343 are provided so as to be spaced apart from each other in the front-rear direction. A through hole 343 a is provided in the upper part of the plate 343. Outer temporary fixing plates 344 are erected on the inner side in the left-right direction on the front surface of the front plate 343 and on the inner side in the left-right direction on the rear surface of the rear plate 343, respectively. The outer temporary fixing plate 344 is provided with a through-hole 344a extending in the left-right direction. The outer temporary fixing plate 344 is opposed to a lateral surface of the support plate 310 described later in the left-right direction.

  On the inner side of each plate 343 in the left-right direction, a support portion 341 having an inner temporary fixing plate 342 provided thereon is erected on the first base weight 301. The inner temporary fixing plate 342 faces the outer temporary fixing plate 344 with the support plate 310 interposed therebetween. In other words, the inner temporary fixing plate 342 and the outer temporary fixing plate 344 are disposed so as to sandwich the support plate 310. The inner temporary fixing plate 342 is provided with a through-hole 342a extending in the left-right direction. The axial center of the through hole 342a of the inner temporary fixing plate 342 and the through hole 344a of the outer temporary fixing plate 344 coincide.

  The first base weight 301 is provided with an opening 302 through which the support plate 310 erected on the second base weight 305 is inserted. The first base weight 301 is provided with two weight side fixing portions 320 symmetrically on the inner side in the left-right direction of the opening 302. The weight side fixing part 320 is a part for fixing the counterweight device 300 to the airframe side fixing plate 110 on the airframe side. Each weight-side fixing portion 320 includes a weight-side fixing plate 321 provided on the inner side in the left-right direction and a weight-side fixing block 322 provided on the outer side in the left-right direction so as to be separated from the weight-side fixing plate 321. The weight side fixing block 322 is thicker in the left-right direction than the weight side fixing plate 321.

  A through hole 321 a is provided in the front and rear portions of the weight side fixing plate 321. A through hole 322 a extending in the left-right direction is provided in the front and rear portions of the weight-side fixing block 322. A through hole 322b extending in the left-right direction is provided in the vicinity of the center in the front-rear direction of the weight-side fixing block 322. A fixing pin 331 extending in the left-right direction is inserted through the through hole 321a in the rear portion of the weight side fixing plate 321 and the through hole 322a in the rear portion of the weight side fixing block 322 so as to be insertable / removable. A fixing pin 332 extending in the left-right direction is inserted through the through-hole 321a in the front portion of the weight-side fixing plate 321 and the through-hole 322a in the front portion of the weight-side fixing block 322 so as to be insertable / removable. An engagement pin 335 is inserted into the through hole 322 b of the weight side fixing block 322.

  The fixing pin 331 is a pin for fixing the counterweight device 300 to the airframe side fixing plate 110 on the airframe side, and a grip portion 331a is attached thereto. 18 and 21 and subsequent figures, the illustration of the fixing pin 331 relating to the left weight side fixing portion 320 is omitted.

  The fixing pin 332 is a pin for fixing the counterweight device 300 to the airframe side fixing plate 110 on the airframe side, and is inserted into and removed from the through holes 321a and 322a by operating the operation lever 333. That is, when the grip portion 333a (FIG. 23) attached to the rear end of the operation lever 333 is operated in the left-right direction, the operation lever 333 supported by the shaft support pin 304 (FIG. 24) causes the shaft support pin 304 to move. Rotate to the center. Accordingly, the fixing pin 332 attached to the front end portion of the operation lever 333 is inserted into and removed from the through holes 321a and 322a. 21 and the subsequent drawings, the illustration of the fixing pin 332 and the operation lever 333 related to the right weight side fixing portion 320 is omitted.

  For example, as shown in FIGS. 21 and 23, each weight-side fixing portion 320 has a guide pin extending in the left-right direction between a weight-side fixing plate 321 and a weight-side fixing block 322 that are opposed to each other in the left-right direction. 323 is attached. Two guide pins 323 are provided apart from each other in the front-rear direction with respect to each weight-side fixing portion 320.

  The engaging pin 335 is a shaft-like member that is inserted and held in the through hole 322b of the weight-side fixing block 322, and a grip portion 335a is attached thereto. The engaging pin 335 is projected and retracted from the end portion (not shown) of the through hole 322b on the outer side in the left-right direction toward the outer side of the weight-side fixing block 322 by operating the grip portion 335a in the left-right direction.

  As shown in FIG. 24, a columnar column 351 extending upward is erected in the vicinity of the center of the first base weight 301 in the left-right direction. A guide pipe 352 is put on the outer periphery of the support column 351. A fixing member attaching portion 355 to which a fixing member 354 for fixing the guide pipe 352 to the supporting column 351 is attached is provided on the upper portion of the supporting column 351. The guide pipe 352 is provided with an opening 353 for fixing the guide pipe 352 to the support column 351 using a fixing member 354. The opening 353 includes an upper opening 353 a provided in the upper part of the guide pipe 352 and a lower opening 353 b provided in the lower part of the guide pipe 352.

  As shown in FIG. 24, when the position of the fixing member attaching portion 355 and the position of the upper opening 353a are made to coincide with each other and the fixing member 354 is attached to the fixing member attaching portion 355 via the upper opening 353a, the guide pipe 352 Is fixed to the column 351 at the lower position. The height of the upper end of the guide pipe 352 at the lower position is substantially the same as the height of the upper end of the support column 351. As shown in FIG. 26 to be described later, when the position of the fixing member mounting portion 355 and the position of the lower opening portion 353b are matched, and the fixing member 354 is attached to the fixing member mounting portion 355 via the lower opening portion 353a, the guide The pipe 352 is fixed to the support column 351 at the upper position. The height of the upper end of the guide pipe 352 at the upper position is higher than the upper end of the support column 351 by the difference in height between the upper opening 353a and the lower opening 353a.

  At the front end of the first base weight 301, a notched guide portion 303 is provided in the center in the left-right direction. On the lower surface of the first base weight 301, a leg portion 301a protruding downward is provided. As shown in FIGS. 21, 23, and 24, when the counterweight device 300 is placed on the ground with the first base weight 301 and the second base weight 305 closest to each other in the vertical direction, the leg portion 301 a To support the weight of the counterweight device 300.

  A fixing portion 361 is provided on the lower surface of the first base weight 301. As shown in FIGS. 21, 23, and 24, the fixing portion 361 is used to fix the first base weight 301 and the second base weight 305 in the state where they are closest to each other in the vertical direction, that is, in the first relative posture. It is a part. The fixing part 361 is fixed by a fixing part 362 and a fixing pin 337 described later of the second base weight 305. The fixing portion 361 is provided with a through hole 361a through which the fixing pin 337 is inserted (FIG. 22).

  The second base weight 305 is provided with a substantially U-shaped support plate 310 that is spaced apart and opposed in the left-right direction. The support plate 310 corresponds to a front support plate 310F on the front side, a rear support plate 310R on the rear side, and a U-shaped bottom, and supports the lower part of the front support plate 310F and the lower part of the rear support plate 310R. Plate central portion 310C. The right support plates 310F and 310R and the left support plates 310F and 310R are symmetrical in shape and arrangement position. The front support plate 310F and the rear support plate 310R are symmetrical in shape, are separated from each other in the front-rear direction, and the rear end surface 310a of the front support plate 310F and the front end surface 310a of the rear support plate 310R are formed. Opposite.

  A through hole 311 extending in the left-right direction is provided in the upper part of each support plate 310F, 310R. The support plate central portion 310C is provided with a through hole 312 extending in the left-right direction (FIG. 22).

  The second base weight 305 is provided with a fixing portion 362 for fixing the first base weight 301 and the second base weight 305 in the first relative posture. The fixing portion 362 is provided with a through hole 362a through which the fixing pin 337 is inserted (FIG. 22).

--- Installation work of counterweight device 300 ---
In the present embodiment, the counterweight device 300 is attached to the upper swing body 3 as follows. First, as shown in FIGS. 23 and 24, the first base weight 301 and the second base weight 305 fixed in the first relative posture are placed on the ground of the assembly site of the crane at the work site. At this time, the fixing pin 337 is inserted into the through hole 361 a of the fixing portion 361 of the first base weight 301 and the through hole 362 a of the fixing portion 362 of the second base weight 305, and the first base weight 301 and the second base weight 301 are inserted. The weight 305 is fixed in the first relative posture. At this time, the bottom surface of the leg portion 301a of the first base weight 301 and the bottom surface (bottom surface) of the second base weight 305 are in contact with the ground.

  Then, as shown in FIG. 21, a counterweight 281 is loaded on the first base weight 301, and the first base weight 301 and the counterweight 281 and the stacked counterweights 281 are fixed to each other with a fixing bolt (not shown). To do.

  The first base weight 301 and the second base weight are extracted by removing the through hole 361 a of the fixing portion 361 of the first base weight 301 and the fixing pin 337 inserted through the through hole 362 a of the fixing portion 362 of the second base weight 305. Release the 305. Then, for example, staking it into the through hole 343a in the upper part of the plate 343, for example, only the first base weight 301 is pulled up by the crane main body 11 or the auxiliary crane to have the second relative posture.

  Then, the through hole 342a of the inner temporary fixing plate 342 of the first base weight 301, the through hole 344a of the outer temporary fixing plate 344, and the through holes 311 of the respective support plates 310F and 310R of the second base weight 305 Then, as shown in FIG. 22, the fixing pins 337 are inserted into the through holes 344a, 311 and 342a (FIG. 24). Thereby, as shown in FIG. 22, the first base weight 301 is temporarily fixed to the upper part of the support plate 310 of the second base weight 305. That is, the first base weight 301 and the second base weight 305 are temporarily fixed in the second relative posture.

  Next, the crane body 11 is moved to the mounting position of the counterweight device 300 so that the counterweight device 300 can be pulled up using the lifting cylinder 120. FIG. 25 is a perspective view showing a state after the crane body 11 has been moved to the mounting position of the counterweight device 300. For convenience of explanation, description of the right counterweight 281 and the like is omitted in each drawing described below.

  Then, the fixing member 354 attached to the fixing member attaching portion 355 of the column 351 is removed via the upper opening 353a, and the fixation between the column 351 and the guide pipe 352 is released. When the guide pipe 352 is moved from the lower position to the upper position, the guide pipe 352 is inserted into the guide pipe 103 on the machine body side. Then, as shown in FIG. 26, the guide pipe 352 inserted into the guide pipe 103 is fixed at the upper position by attaching the fixing member 354 to the fixing member attaching portion 355 via the lower opening 353b.

  The cylinder rod of the elevating cylinder 120 is extended to lower the elevating engagement portion 151, and the engagement pin 335 held by the through-hole hole 152 a of the elevating engagement portion 151 and the weight side fixing block 322. Align the height position with. At this time, the rear end surface 310a of the front support plate 310F and the front end surface 310a (FIGS. 21 and 23) of the rear support plate 310R are formed in the guide groove 153a (FIG. 19) of the guide plate 153 of the elevating engagement portion 151. Get in. As a result, the elevating engagement portion 151 is guided between the front support plate 310F and the rear support plate 310R.

  Then, by operating the grip portion 335 a, the engagement pin 335 protrudes from the end portion (not shown) on the outer side in the left-right direction of the through hole 322 b toward the outside of the weight side fixing block 322, and penetrates the engagement pin 335. The long hole 152a is inserted. Thereby, as shown in FIG. 27, the raising / lowering engaging part 151 and the weight side fixing block 322 are engaged.

  When the cylinder rod of the elevating cylinder 120 is retracted, the counterweight device 300 is raised while the guide pipe 352 of the counterweight device 300 is guided by the guide pipe 103 on the airframe side. When the counterweight device 300 is raised, the fuselage-side fixing plate 110 enters between the weight-side fixing plate 321 and the weight-side fixing block 322 of each weight-side fixing portion 320. At this time, the guide pin 323 (FIGS. 21 and 23) of the weight side fixing part 320 is guided by the positioning notch 113 </ b> A (FIG. 20) of the machine body side fixing plate 110. Further, when the counterweight device 300 is raised, the guide portion 303 at the front end of the first base weight 301 is guided by the guide 293 (FIG. 20) on the machine body side. In this way, as shown in FIG. 28, the first base weight 301 is positioned with respect to the frame beam 101 at the rear end of the upper swing body 3.

  Thereafter, the holding portion 331a is operated to fix the fixing pin 331 to the through hole 321a (FIGS. 21 and 23) of the weight side fixing plate 321, the fixing pin insertion hole 112 (FIG. 20) of the body side fixing plate 110, and the weight side fixing. The block 322 is inserted through the through hole 322a (FIGS. 21 and 23). Similarly, by operating the grip portion 333a, the fixing pin 332 is inserted into the through hole 321a (FIGS. 21 and 23) of the weight side fixing plate 321, the fixing pin insertion hole 114 (FIG. 20) of the fuselage side fixing plate 110, and the weight side. The fixing block 322 is inserted into the through hole 322a (FIGS. 21 and 23). Thereby, as shown in FIG. 29, the first base weight 301 is fixed to the frame beam 101 at the rear end of the upper swing body 3.

  Thereafter, the gripping portion 335a (FIGS. 21 and 23) is operated to move the engagement pin 335 inward in the left-right direction, and the engagement pin 335 is removed from the through long hole 152a (FIG. 19). As a result, the engagement between the lifting engagement portion 151 and the weight side fixing block 322 is released. Then, the cylinder rod of the elevating cylinder 120 is extended and the elevating engagement portion 151 is lowered to support the through hole 152b below the engagement plate 152 of the elevating engagement portion 151 and the second base weight 305. The height position of the plate center portion 310C and the through hole 312 is matched.

  Then, the engagement pin 338 (FIG. 30) is inserted through the through hole 152b of the engagement plate 152 and the through hole 312 of the support plate center portion 310C. Thereby, as shown in FIG. 30, the engaging part 151 for raising / lowering and the support plate center part 310C of the 2nd base weight 305 are engaged.

  Thereafter, the first base weight 301 is inserted into the through hole 342a of the inner temporary fixing plate 342, the through hole 344a of the outer temporary fixing plate 344, and the through holes 311 of the support plates 310F and 310R of the second base weight 305. The fixed pin 337 is removed. Thereby, as shown in FIG. 31, the temporary fixing of the first base weight 301 and the second base weight 305 is released.

  Thereafter, the cylinder rod of the elevating cylinder 120 is retracted and the second base weight 305 is raised. As a result, the second base weight 305 approaches the first base weight 301, and the relative posture between the first base weight 301 and the second base weight 305 changes from the first relative posture to the second relative posture. After the cylinder rod of the elevating cylinder 120 is retracted until the through hole 361a of the fixing portion 361 of the first base weight 301 and the through hole 362a of the fixing portion 362 of the second base weight 305 overlap in side view, the cylinder rod is retracted. To stop. Then, as shown in FIG. 32, the fixing pin 337 is inserted into the through holes 361a and 362a, and the first base weight 301 and the second base weight 305 are fixed in the first relative posture.

  Thus, the work for attaching the counterweight device 300 is completed, and the state shown in FIG. 18 is obtained. It should be noted that the removal work of the counterweight device 300 from the upper swing body 3 may be performed in the reverse order of the above-described work procedure of attaching the counterweight device 300.

In the mobile crane 10 of the second embodiment, in addition to the effects of the first embodiment, the following functions and effects are exhibited.
(1) The first base weight 301 and the second base weight 305 are configured to take a first relative posture that overlaps in the vertical direction and a second relative posture that is separated in the vertical direction. The first base weight 301 and the second base weight 305 are configured to be able to be fixed and released from each other in each of the first relative posture and the second relative posture. Then, when the counterweight device 300 is placed on the ground and the first base weight 301 and the second base weight 305 are in the second relative posture, the lifting cylinder 120 provided on the airframe side is engaged for lifting. The portion 151 can be engaged with the weight side fixing block 322 of the first base weight 301 with the engaging pin 335. Accordingly, the counterweight device 300 placed on the ground can be pulled up by the lifting cylinder 120 with a short stroke, so that the position of the mounting portion 108 of the lifting cylinder 120 can be lowered and is higher than the mounting portion 108 of the lifting cylinder 120. Can be used effectively.

(2) The counterweight device 300 taking the second relative posture is lifted from the ground by the lifting cylinder 120, the first base weight 301 is fixed to the frame beam 101 at the rear end of the upper swing body 3, and then lifted The engaging part 151 for raising / lowering of the cylinder 120 is configured to be engaged with the support plate center part 310 </ b> C of the second base weight 305 by the engaging pin 338. Accordingly, the relative posture between the first base weight 301 and the second base weight 305 can be changed from the second relative posture to the first relative posture by the elevating cylinder 120, so that the lower end of the counterweight device 300, that is, the second The height of the lower surface of the base weight 305 from the ground can be secured. Therefore, the second base weight 305 does not interfere with the lower traveling body 1 when the upper swing body 3 is turned, and the function related to the turning of the mobile crane 10 is not impaired.

---- Modified example ---
(1) In the above description, the counterweight devices 200 and 300 mounted on the ground are configured to be lifted in two stages using the lifting cylinder 120, but the present invention is not limited to this. For example, the counterweight device 200 according to the first embodiment may be configured to be lifted in three or more stages instead of being lifted in two stages. In the case of pulling up in three or more stages, the engagement work and the disengagement work between the lifting engagement portion 121 and the counterweight device 200 are increased as compared with the case of pulling up in two stages. Therefore, as described above, it is desirable to pull up in two stages.

(2) In the above description, the elevating cylinder 120 that is a hydraulic cylinder is used as the elevating device for elevating the counterweight devices 200 and 300, but the present invention is not limited to this. For example, instead of the lifting cylinder 120, other types of actuators such as an electric linear actuator may be used.

(3) In the above description, a mobile crane has been described as an example of a work machine, but the present invention is not limited to this. For example, the present invention may be applied to other work machines configured such that the counterweight device is attached to and detached from the main body of the work machine, such as a hydraulic excavator.
(4) You may combine each embodiment and modification which were mentioned above, respectively.

  The present invention is not limited to the above-described embodiment, and other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention as long as the characteristics of the present invention are not impaired. It is.

DESCRIPTION OF SYMBOLS 10 Mobile crane, 110 Airframe side fixed plate, 120 Lifting cylinder, 121,151 Lifting engagement part, 140 Receiving bracket, 200,300 Counterweight device, 211 Engagement long hole, 212 Engagement hole, 220, 320 Weight Side fixing portion, 240 Temporary fixing link member, 301 First base weight, 305 Second base weight, 312, 322b Through hole

Claims (9)

An upper swing body having a swing frame;
A counterweight device detachably attached to a fuselage side fixing portion provided at a rear end of the revolving frame;
The upper part has an airframe side engaging portion engageable with the counterweight device, and lifts and lowers the counterweight device engaged with the airframe side engaging portion by moving the airframe side engaging portion up and down. A lifting device provided on the revolving structure;
A fuselage side locking portion attached to the upper swing body,
An engaging portion provided in the counterweight device, wherein when the counterweight device is placed on the ground, the upper engaging portion is engageable with the airframe side engaging portion lowered by the elevating device. When,
A locking device for temporarily fixing the counterweight device to the swivel frame by being locked to the airframe side locking portion, wherein the airframe side engaging portion and the upper engaging portion are engaged with each other. A weight-side locking device that temporarily fixes the counterweight device to the swivel frame at a height position where the counterweight device is raised by an elevating device;
An engagement portion provided in the counterweight device, wherein the weight-side locking device is locked to the body-side locking portion, and the counterweight device is temporarily fixed to the swivel frame, and the lifting and lowering is performed. A lower engaging portion engageable with the airframe side engaging portion lowered by the apparatus;
A fixing part for fixing the counterweight device to a rear end of the revolving frame by fixing to the airframe side fixing part, wherein the airframe side engaging part and the lower engaging part are engaged with each other to move up and down A work machine comprising: a weight side fixing portion that fixes the counterweight device to a rear end of the revolving frame at a height position where the counterweight device is further raised by the device. The work machine according to claim 1,
The lift of the lifting device is a working machine that is smaller than the difference in height between the counterweight device mounted on the ground and the counterweight device attached to the rear end of the swivel frame. In the work machine according to claim 1 or 2,
The weight side locking device releases the locking to the airframe side locking portion and the temporarily fixed posture in which the counterweight device is temporarily fixed to the turning frame by locking the airframe side locking portion. A working machine capable of adopting a retracted posture for storing the weight side locking device. In the work machine according to any one of claims 1 to 3,
The lifting device is a work machine disposed below a winch device provided at the rearmost among a plurality of winch devices provided on the upper swing body. An upper swing body having a swing frame;
A counterweight device detachably attached to a fuselage side fixing portion provided at a rear end of the revolving frame;
A lifting hydraulic cylinder attached to the upper swing body;
A cylinder side engaging portion that moves up and down by expansion and contraction of a cylinder rod of the lifting hydraulic cylinder;
A fuselage side locking portion attached to the upper swing body,
An engagement portion provided in the counterweight device, wherein the cylinder-side engagement portion extends and lowers the cylinder rod of the lifting hydraulic cylinder when the counterweight device is placed on the ground. An upper engaging portion engageable with,
A locking device for temporarily fixing the counterweight device to the swivel frame by locking with the machine body side locking portion, wherein the cylinder side engaging portion and the upper engaging portion are engaged with each other. A weight side locking device for temporarily fixing the counterweight device to the revolving frame at a height position where the cylinder rod of the lifting hydraulic cylinder is retracted and the counterweight device is pulled up;
An engagement portion provided in the counterweight device, wherein the weight-side locking device is locked to the body-side locking portion, and the counterweight device is temporarily fixed to the swivel frame, and the lifting and lowering is performed. A lower engaging portion that can be engaged with the cylinder side engaging portion that is extended by lowering the cylinder rod of the hydraulic cylinder for use;
A fixing portion for fixing the counterweight device to a rear end of the revolving frame by fixing to the airframe side fixing portion, wherein the cylinder side engaging portion and the lower engaging portion are engaged with each other to raise and lower the counterweight device. A work machine comprising: a weight side fixing portion that fixes the counterweight device to a rear end of the revolving frame at a height position where the cylinder rod of the hydraulic cylinder is retracted and the counterweight device is further pulled up. A counterweight device detachably attached to a fuselage-side fixing portion provided at a rear end of a swing frame of an upper swing body of a work machine,
An upper engaging portion engageable with an elevating device provided in the upper swing body;
A weight side locking device for temporarily fixing the counterweight device to the swivel frame at a height position where the lifting device and the upper engaging portion are engaged to raise the counterweight device by the lifting device; ,
A lower engagement portion provided below the upper engagement portion, engageable with the elevating device in a state where the counterweight device is temporarily fixed to the turning frame by the weight side locking device;
Weight-side fixing for fixing the counterweight device to the rear end of the swivel frame at a height position where the counterweight device is further raised by the lifting device by engaging the lifting device and the lower engaging portion. A counterweight device. The counterweight device according to claim 6,
The weight-side locking device is a counterweight device that can take a temporarily fixed posture in which the counterweight device is temporarily fixed to the turning frame and a retracted posture in which the weight-side locking device is stored. An upper engaging portion of the counterweight device and the airframe side engaging portion placed on the ground behind the swivel frame by lowering the airframe side engaging portion of the lifting device provided on the upper revolving body having the revolving frame. And engage
Raise the counterweight device to a predetermined height with the lifting device,
Temporarily fixing the counterweight device raised to the predetermined height to the swivel frame;
Release the engagement between the airframe side engaging portion and the upper engaging portion,
Lowering the airframe side engaging portion, engaging the lower engaging portion of the counterweight device temporarily fixed to the swivel frame with the airframe side engaging portion,
Raise the counterweight device to the mounting height of the swivel frame with the lifting device,
A counterweight device mounting method for mounting the counterweight device raised to the mounting height to a rear end of the turning frame. An upper swing body having a swing frame;
A counterweight device detachably attached to a fuselage side fixing portion provided at a rear end of the revolving frame;
The upper part has an airframe side engaging portion engageable with the counterweight device, and lifts and lowers the counterweight device engaged with the airframe side engaging portion by moving the airframe side engaging portion up and down. A lifting device provided on the swivel body,
The counterweight device has a first base weight on the upper side and a second base weight on the lower side that overlap each other and can be fixed and released from each other.
The first base weight and the second base weight can be fixed and released from each other in a first relative posture close to each other in the vertical direction, and a second relative posture separated from each other in the vertical direction. Can be fixed and released from each other,
The first base weight is:
A weight side fixing portion for fixing the counterweight device to a rear end of the turning frame;
When the first base weight and the second base weight are fixed to each other in the second relative posture and placed on the ground, the first base weight and the second base weight are engaged with the airframe side engaging portion lowered by the lifting device. A first engaging portion capable of being combined,
In the second base weight, when the first base weight and the second base weight are in the second relative posture, the weight side fixing portion is fixed to the body side fixing portion. A second engaging portion that can be engaged with the airframe side engaging portion lowered by the lifting device,
In the state where the first base weight and the second base weight are in the second relative posture, the weight side fixing portion is fixed to the fuselage side fixing portion, and is engaged with the second engaging portion. A work machine that takes the first relative posture when the machine body side engaging portion is lifted by the lifting device.

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