JP2010006554A - Counterweight attaching/detaching device and truck crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a counterweight attaching/detaching device easy in attaching and detaching. <P>SOLUTION: This counterweight attaching/detaching device is equipped with a weight elevating cylinder 25 mounted extendably downward in the substantially vertical direction on a machine frame 20, a bracket 26 forming a substantially point symmetric shape in plan view provided at a tip end of the cylinder 25, pin members 41, 42 insertably/detachably mounted on the counterweight 30 by crossing an upper space of the bracket 26 during extension of the cylinder 25, and on which the weight of the counterweight 30 is applied by abutting on an upper face of the bracket 26 when the cylinder 25 is retreated, and fixing means 43, 44 for fixing the counterweight 30 lifted via the pin members 41, 42 to an end of the machine frame 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a counterweight attaching / detaching device and a truck crane for attaching a counterweight to an end portion of an airframe frame.

  Conventionally, a truck crane in which a turning frame is mounted on an upper portion of a traveling body is known (see, for example, Patent Document 1). In the truck crane described in Patent Document 1, a counterweight placed on the upper surface of a traveling body is connected to a gantry (also referred to as an A frame), and a gantry hoisting cylinder is extended to erect the gantry. As a result, the counterweight is raised via the gantry, and the counterweight is attached to the end of the swivel frame via the support pin.

  On the other hand, an apparatus is known in which a weight lifting cylinder is provided on the counterweight, and the counterweight is attached to the end of the revolving frame using this cylinder (see, for example, Patent Document 2). In the device described in Patent Document 2, the cylinder for lifting and lowering the weight is extended, the rod pin at the tip of the cylinder rod is engaged with the upper end of the turning frame, and then the cylinder is retracted. As a result, the counterweight is raised via the rod pin, and the counterweight is attached to the end of the swivel frame via the support pin.

JP-A-6-171891 JP 2006-44948 A

  However, since the thing of the said patent document 1 raises a counterweight via a gantry, an excessive load is applied to a gantry and there exists a problem on intensity | strength. Further, in the apparatus described in Patent Document 2, the cylinder rod of the weight lifting cylinder rotates around the axis, and therefore the orientation of the rod pin is bothered to engage the rod pin at the tip of the cylinder rod with the turning frame. It took time to do.

A counterweight attachment / detachment device according to the present invention is a counterweight attachment / detachment device that attaches a counterweight to an end of a body frame, and a weight lifting cylinder attached to the body frame so as to be able to extend downward in a substantially vertical direction; A bracket having a substantially point-symmetric shape in plan view provided at the tip of the cylinder, and attached to the counterweight so that it can be inserted into and removed from the counterweight across the upper space of the bracket when the cylinder is extended. And a counter member that receives the weight of the counterweight, and a fixing means that fixes the counterweight lifted through the pin member to the end of the body frame.
The counterweight attaching / detaching device according to the present invention is a counterweight attaching / detaching device that attaches a counterweight to the end of the body frame, and is used for lifting and lowering the weight attached to the counterweight so as to be able to extend substantially vertically upward. A cylinder, a bracket having a substantially point-symmetrical shape in plan view provided at the tip of the cylinder, and a bracket that is detachably attached to the body frame across the space below the bracket when the cylinder is extended, and when the cylinder is retracted, The counter member is provided with a pin member that abuts on the lower surface of the frame member and acts on the weight of the counter weight, and a fixing unit that fixes the counter weight lifted through the pin member to the end of the body frame.

  According to the present invention, the counterweight can be attached to the frame regardless of whether the cylinder rod is rotated, and the counterweight can be easily attached.

  Hereinafter, with reference to FIGS. 1-6, one Embodiment at the time of applying the counterweight attachment / detachment apparatus by this invention to a truck crane is described. FIG. 1 is a side view showing a traveling posture of a truck crane having a counterweight attaching / detaching device according to the present embodiment, and FIG. 2 is a side view showing a working posture of a counterweight attaching / detaching operation. The truck crane includes a vehicle body frame 1 to which a traveling tire 3 is attached, and a turning frame 2 that is turnably mounted on the vehicle body frame 1 via a turning wheel 4. In the following, the front-rear direction is defined with reference to the vehicle body frame 1 as shown in the figure. A cab 5 is provided in front of the body frame 1.

  As shown in FIG. 1, a boom 6 is connected to one end portion (front end portion in the figure) of the revolving frame 2 so as to be pivotable in the vertical direction. It is supported. An A frame 7 (also called a gantry) is mounted behind the boom 6. The A frame 7 is rotatably connected to the revolving frame 2 and is folded rearward in the running posture, and rises by extension of the A frame hoisting cylinder 8 as shown in FIG. The body frame 1 is provided with a jack cylinder 11, and the body is jacked up by the jack cylinder 11 during work.

  The revolving frame 2 is mounted with a hoisting drum and a hoisting drum (not shown), and a hoisting rope is wound around the hoisting drum and a hoisting rope is wound around the hoisting drum. During the cargo handling operation, the hoisting rope is wound around the sheave 9 at the top of the A frame 7, and the boom 6 (not shown in FIG. 2) is hoisted by winding or unwinding the hoisting rope. Further, the hoisting rope is suspended via the upper end portion of the boom 6, and the suspended load is raised and lowered by winding or feeding the hoisting rope.

  As shown in FIG. 1, an attachment / detachment unit 20 for attaching / detaching a counterweight is attached to an end portion (rear end portion in the figure) of the revolving frame 2. In consideration of the weight balance of the vehicle body during traveling, the counterweight 30 is placed at the center of the vehicle body frame 1, that is, in front of the turning frame 2 and on the upper surface of the vehicle body frame 1 in the traveling posture. As shown in FIG. 2, the counterweight 30 is attached by turning the turning frame 2 by 180 ° and positioning the detachable unit 20 above the counterweight 30. The counterweight 30 is attached to the opposite side of the boom 3 and maintains the weight balance during the cargo handling operation.

  FIGS. 3A and 3B are a plan view and a side view showing the configuration of the detachable unit 20, respectively. For convenience of explanation, the front / rear and left / right directions of the detachable unit 20 are defined here as shown in the figure. The detachable unit 20 has a symmetrical shape, and a part of the right side is omitted in FIG. The detachable unit 20 includes a base 21 extending in the left-right horizontal direction, a pair of left and right cylinder support plates 22 projecting upward from the upper surface of the base 21, and projecting downward from the lower surface of the base 21. A pair of left and right weight support plates 23, a unit mounting bracket 24 projecting downward and rearward from the lower surface of the base 21, and a weight lifting hydraulic cylinder 25 are provided.

  The cylinder support plate 22 is cut out from the lower end to the upper side, and a front plate portion 22a, an upper plate portion 22b, and a rear plate portion 22c are formed. The lower end of the front plate portion 22a and the lower end of the rear plate portion 22c are fixed to attachment portions 221 and 222 on the upper surface of the base, respectively. In FIG. 3A, only the mounting portions 221 and 222 are shown, and the cylinder support plate 22 is not shown. The rear plate portion 22c is formed to be inclined so as not to interfere with the A frame 7 in the traveling posture of FIG.

  An upper end portion 251 of the hydraulic cylinder 25 is sandwiched between upper plate portions 22b of the left and right cylinder support plates 23, and is pin-coupled to the cylinder support plate 22 so as to be rotatable in the front-rear direction. As shown in FIG. 3A, a long through hole 211 is opened in the front and rear direction in the base 21, and a cylinder tube 252 wider than the upper end 251 of the hydraulic cylinder 25 passes through the through hole 211. Yes.

  A plate-like bracket 26 is pin-coupled to the lower end portion of the cylinder rod 253 of the hydraulic cylinder 25 so as to be rotatable in the front-rear direction. The bracket 26 has a substantially circular shape in plan view (see FIG. 5), and the tip of the cylinder rod 253 is connected to the center thereof.

  The weight support plates 23 (also simply referred to as support plates) project from the left and right sides of the through hole 211, and the hydraulic cylinder 25 is suspended between the left and right weight support plates 23. On the lower end surface of each support plate 23, substantially arc-shaped engagement grooves 231 and 232 are provided at the same height in two places in the front-rear direction. A through hole 233 is opened above and in front of the engaging groove 231, and a through hole 234 is opened vertically above the engaging groove 232 at the same height as the through hole 233.

  FIG. 4 is an enlarged view of the main part of FIG. 4A shows a state in which the counterweight 30 is placed on the upper surface of the vehicle body frame 1, and FIG. 4B shows a state in which the counterweight 30 is attached to the lower end portion of the detachable unit 20. Yes.

  As shown in FIG. 4A, a convex portion 12 is provided on the upper surface of the vehicle body frame 1, and a concave portion on the bottom surface of the counterweight is fitted to the convex portion 12, and the counterweight 30 is positioned on the upper surface of the vehicle body frame 1. It is placed. The unit mounting bracket 24 is provided with two upper and lower pin holes 241 (FIG. 3B), and the detachable unit 20 is pivoted through two upper and lower pins 242 inserted into the pin holes 241. It is fixed to the end (front end in the figure) of the frame 2.

  FIG. 5 is a cross-sectional view taken along the line VV in FIG. 4B showing the configuration of the counterweight 30. Note that the counterweight 30 has a symmetrical shape, and a part of the right side is omitted in FIG. The counterweight 30 is a laminated weight in which a plurality of weights 301 are laminated and integrated. As shown in FIGS. 4 and 5, a pair of left and right support plates 31 protrude from the upper surface of the uppermost counterweight 30. Has been. As shown in FIG. 5, the diameter of the bracket 26 at the lower end of the hydraulic cylinder 25 is smaller than the distance between the left and right support plates 31.

  In each support plate 31, through holes 311 and 312 are opened at positions corresponding to the engaging grooves 231 and 232 of the support plate 23 of the detachable unit 20, and the through holes 313 are respectively formed at positions corresponding to the through holes 233 and 234. , 314 are opened. That is, through holes 311 and 312 are opened at the same height in the support plate 31, and through holes 313 and 314 are opened at the same height above the support plate 31.

  As will be described later, pins 41 and 42 are inserted into the through holes 311 and 312, respectively, and pins 43 and 44 are inserted into the through holes 313 and 314, respectively. As shown in FIG. 6, the pins 41 and 42 are attached to the lever 46 via the bracket 45. Similarly, the pins 43 and 44 are attached to a lever 47 (FIG. 5) via a bracket.

  An attachment procedure for attaching the counterweight 30 using the counterweight attachment / detachment device according to the present embodiment will be described. The counterweight 30 is positioned on the upper surface of the vehicle body frame 1 via the convex portion 12. For this reason, when the hydraulic cylinder 25 is extended in a state where the revolving frame 2 is revolved from the running posture by a predetermined amount (180 °), the bracket 26 is lowered as shown in FIG. The bracket 26 is inserted. FIG. 4A shows a state in which the hydraulic cylinder 25 is extended to the maximum, and the bracket 26 is in contact with the upper surface of the counterweight 30. In this case, the bracket 26 is circular, and the bracket 26 can be brought into contact with a predetermined position on the upper surface of the counterweight even if the cylinder rod 253 rotates around the axis in the cylinder tube 252 when the cylinder 25 is extended.

  Next, the operator inserts the pins 41 and 42 into the through holes 311 and 312 of the support plate 31 from the side via the lever 46, respectively. As shown in FIG. 5, the distance between the pins 41 and 42 is smaller than the diameter of the bracket 26, and the pins 41 and 42 cross the upper space of the bracket 26 on both the front and rear sides of the hydraulic cylinder 25 in plan view. In this state, the hydraulic cylinder 25 is degenerated.

  When the hydraulic cylinder 25 is retracted, the bracket 26 rises and the pins 41 and 42 abut on the upper surface of the bracket 26. When the hydraulic cylinder 25 is further retracted, the counterweight 30 is raised in a horizontal posture via the pins 41 and 42, and the pins 41 and 42 are guided to the engaging grooves 231 and 232 as shown in FIG. The pins 41 and 42 are engaged with the upper ends of the engaging grooves 231 and 232. Thereby, the position of the counterweight 30 with respect to the detachable unit 20 is defined.

  In a state where the pins 41 and 42 are engaged with the engaging grooves 231 and 232, the positions of the through holes 313 and 233 and the positions of the through holes 314 and 234 coincide with each other. The operator inserts the pin 43 into the through holes 313 and 233 and the pin 44 into the through holes 314 and 234 from the side via the lever 47. Thereby, the counterweight 30 is fixed to the detachable unit 20 by the pins 41 to 44. The removal of the counterweight 30 is performed in the reverse procedure as described above.

According to the present embodiment, the following operational effects can be achieved.
(1) A circular bracket 26 is attached to the tip of the cylinder rod 253 of the hydraulic cylinder 25, crosses the upper space of the bracket 26 when the cylinder 25 is extended, and abuts on the upper surface of the bracket 26 when the cylinder 25 is retracted. The pins 41 and 42 on which the weight of the counterweight 30 acts are attached to the support plate 31 at the upper end of the counterweight 30, and the counterweight 30 pulled up by the degeneration of the cylinder 25 is attached to the detachable unit 20 via the pins 43 and 44. I fixed it. Accordingly, regardless of whether or not the cylinder rod 253 rotates in the cylinder tube 252, the counterweight 30 can be raised via the pins 41 and 42 by the degeneration of the hydraulic cylinder 25. Therefore, there is no need to worry about the rotation of the cylinder rod 253, and the counterweight 30 can be easily attached.

(2) Since the hydraulic cylinder 25 is attached to the detachable unit 20 so as to be pivotable in the front-rear direction and the hydraulic cylinder 25 is suspended from above, the position of the bracket 26 when the cylinder 25 is extended is determined, and the bracket 26 is accurately counterweighted. 30 can be brought into contact with the upper surface.
(3) Since the pins 41 and 42 are attached to the support plate 31 at the upper end portion of the counterweight 30 in the same horizontal plane with the cylinder rod 253 sandwiched therebetween, the counterweight 30 is stabilized through the pins 41 and 42. Can be moved up and down.
(4) Since the counterweight 30 is placed on the upper surface of the central portion of the vehicle body frame 1 in the traveling posture, the weight balance of the vehicle body during traveling is good.
(5) Since the bracket 26 has a circular shape that is a completely symmetrical shape, a constant contact area between the pins 41 and 42 and the bracket 26 can be ensured regardless of the rotation of the bracket 26.

  In the above-described embodiment, the airframe is configured by attaching the detachable unit 20 to the end of the revolving frame 2, but the configuration of the airframe is not limited thereto. The counterweight 30 may be directly attached to the revolving frame 2 without using the detachable unit 20. Although the bracket 26 has a circular shape, the bracket 26 may have any shape as long as it has a substantially point-symmetric shape in plan view. For example, the shape of the bracket 26 may be a regular polygon. Also in this case, the counterweight 30 can be raised regardless of whether the cylinder rod 253 is rotated.

  In the above embodiment, the hydraulic cylinder 25 is attached to the detachable unit 20 so that it can be extended vertically downward, and the bracket 26 is attached to the lower end portion of the cylinder rod 253, but the counterweight 30 faces upward in the vertical direction. The hydraulic cylinder 25 may be attached so that it can be extended, and the bracket 26 may be attached to the upper end of the cylinder rod 253. That is, when the cylinder 25 is extended, the pins 41 and 42 are attached so as to be detachable from the body frame across the space below the bracket 26, and when the cylinder 25 is retracted, the pins 41 and 42 are brought into contact with the lower surface of the bracket 26 to be countered. The weight 30 may be pulled up and fixed to the end of the body frame by pins 43 and 44.

  Although the pair of pins 41 and 42 are horizontally provided so as to sandwich the cylinder rod 253, the configuration of the pins 41 and 42 as the pin member is not limited thereto. Although the counterweight 30 pulled up via the pins 41 and 42 is fixed to the revolving frame 2 via the detachable unit 20 by the pins 43 and 44, the configuration of the fixing means is not limited to this.

  In the above, an example in which the counterweight attaching / detaching device is applied to a truck crane having a vehicle body frame 1 to which a traveling body tire 3 is attached and a vehicle body frame (a turning frame 2) mounted on the vehicle body frame 1 so as to be able to turn is shown. However, the present invention is similarly applicable to other construction machines and work vehicles having a counterweight. That is, as long as the features and functions of the present invention can be realized, the present invention is not limited to the counterweight attachment / detachment device of the embodiment.

It is a side view of the track frame concerning an embodiment of the invention, and is a figure showing running posture. It is a side view of the track frame concerning an embodiment of the invention, and is a figure showing a working posture of a counterweight attaching / detaching operation. The top view and side view which show the structure of the attachment / detachment unit of FIG. The figure which shows the structure of the counterweight attachment / detachment apparatus which concerns on this Embodiment. The VV sectional view taken on the line of FIG.4 (b). The perspective view which shows the structure of the lever of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Body frame 2 Revolving frame 20 Detachable unit 25 Hydraulic cylinder 26 Bracket 30 Counterweight 41-44 Pin

Claims (5)

A counterweight attaching / detaching device for attaching a counterweight to an end of a machine body frame,
A weight raising / lowering cylinder attached to the body frame so as to be able to extend substantially vertically downward;
A bracket having a substantially point-symmetric shape in a plan view provided at the tip of the cylinder;
A pin member that is detachably attached to the counterweight across the upper space of the bracket when the cylinder is extended, and that abuts against the upper surface of the bracket and acts on the weight of the counterweight when the cylinder is retracted; ,
A counterweight attaching / detaching device, comprising: fixing means for fixing the counterweight pulled up via the pin member to an end portion of the body frame. A counterweight attaching / detaching device for attaching a counterweight to an end of a machine body frame,
A weight lifting cylinder attached to the counterweight so as to be able to extend substantially vertically upward;
A bracket having a substantially point-symmetric shape in a plan view provided at the tip of the cylinder;
A pin member that is detachably attached to an airframe frame across the lower space of the bracket when the cylinder is extended, and a weight of the counterweight acts on the lower surface of the bracket when the cylinder is retracted; ,
A counterweight attaching / detaching device, comprising: fixing means for fixing the counterweight pulled up via the pin member to an end portion of the body frame. In the counterweight attachment / detachment device according to claim 1 or 2,
The bracket weight attaching / detaching device, wherein the bracket has a substantially circular shape in a plan view. In the counterweight attachment / detachment device according to any one of claims 1 to 3,
A tip portion of a cylinder rod of the cylinder is attached to a central portion of the bracket, and the pin member includes two pins provided in parallel in the same horizontal plane with the cylinder rod interposed therebetween. Counterweight attaching / detaching device. A vehicle body frame to which a traveling tire is attached and a counterweight is placed on the upper surface during traveling;
A fuselage frame mounted on the body frame so as to be capable of turning;
5. A truck crane comprising the counterweight attaching / detaching device according to any one of claims 1 to 4, wherein a counterweight placed on an upper surface of the vehicle body frame is attached to an end of the machine body frame during work. .

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