JP5036574B2 - Float mounting device for construction machinery - Google Patents

Description

  The present invention relates to a float mounting apparatus for a construction machine in which an upper end of a float is detachably mounted on a lower end of a jackup cylinder.

  In some construction machines such as a crawler crane, a hydraulic cylinder for jacking up is provided on the upper swing body, and the upper swing body is jacked up by extension of the hydraulic cylinder (for example, see Patent Document 1). In addition, there is a type in which a hydraulic cylinder for jacking up is provided on the lower traveling body, and the lower traveling body is jacked up by extension of the hydraulic cylinder (see, for example, Patent Document 2).

JP-A-7-228483 JP-A-10-265176

  A float (also called a pontoon) is attached to the lower end of this type of jack-up cylinder in order to increase the stability of the airframe during jack-up. However, it is not easy to attach and remove the float.

  A float mounting apparatus for a construction machine according to a first aspect of the present invention is a float mounting apparatus for a construction machine in which an upper end portion of a float is detachably attached to a lower end portion of a jack cylinder for jacking up an airframe, and is attached to an upper end portion of a float. The lever member attached to the provided cylinder receiving part, the engaging position for engaging the groove formed on the lower outer peripheral surface of the jack cylinder, and the retracting position for retracting to the outer diameter side from the lower outer peripheral surface are moved. A support means for supporting the lever member and a holding mechanism for holding the lever member in the retracted position. The support means is a bracket provided on the outer diameter side of the lower outer peripheral surface of the jack cylinder and on the upper part of the cylinder receiving portion of the float. The lever member is rotatably supported in the vertical direction, and the lever member has a through hole through which the support means passes, and the axis of the jack cylinder The center of gravity is provided on the outer diameter side of the reference through hole, and the jack cylinder is positioned on the inner diameter side of the through hole with reference to the axis of the jack cylinder when the float cylinder receiving portion approaches the bottom surface of the jack cylinder. There is a protrusion that is pressed against the bottom surface of the cylinder and pivots the lever member upward, and the protrusion rotates against the lever member when pressed against the bottom surface of the jack cylinder. After being released, the lever member is rotated upward by its own weight to engage with the groove.

According to the present invention, the lever member is movably supported at the engagement position and the retracted position, and the lever member can be held at the retracted position . Then, the lever member pivots upward by being pressed against the bottom surface of the jack cylinder, and after the contact is released, the protrusion that pivots upward by the weight of the lever member and engages the groove is provided. Provided on the lever member. This facilitates the attachment and removal of the float from the jack cylinder via the lever member.

Hereinafter, an embodiment of a float mounting apparatus for a construction machine according to the present invention will be described with reference to FIGS.
FIG. 1 is an external side view of a crawler crane as an example of a construction machine having a float mounting device according to the present embodiment. The crawler crane includes a lower traveling body 1, an upper revolving body 2 that is pivotably mounted above the lower traveling body 1 via a swivel wheel, and a boom 3 that is pivotally supported by the upper revolving body 2. And have.

  FIG. 2 is a front view of the crawler crane. The traveling body 1 includes a track frame 11 provided with turning wheels, and a pair of side frames 12 provided on both the left and right sides of the track frame 11. A crawler belt 12 a is attached around the side frame 12. Although not shown, the track frame 11 has a substantially H shape in plan view, and extends in the left-right direction at the front and rear of the turning wheel, and the side frames 12 are supported at both left and right ends thereof. A pair of left and right support beams 13 are fixed to the front surface portion and the rear surface portion (only the front surface portion is shown) of the track frame 11, and the jack-up hydraulic pressure that can be expanded and contracted in the vertical direction at the front end portion of each support beam 13. A cylinder 14 is supported.

  FIG. 3 is a front view illustrating a jack-up state of the crane. A float 15 is attached to the lower end of the hydraulic cylinder 14, and the machine body (the traveling body 1 and the revolving body 2) is jacked up from the ground via the float 15 by the extension of the hydraulic cylinder 14. By attaching the float 15 to the lower end of the cylinder 14 in this way, the ground contact area at the lower end of the cylinder is increased, and the crane can be stably supported in the jack-up state.

  In the jack-up state, the crane is mainly disassembled and assembled. FIG. 3 shows a state in which the side frame 12 is lifted by the auxiliary crane and the side frame 12 is attached to the end portion of the track frame 11. If the hydraulic cylinder 14 is retracted after attaching the pair of left and right side frames 12, the body is jacked down and the side frames 12 are grounded. After the side frame 12 is grounded, the hydraulic cylinder 14 is further retracted, and the float 15 is removed from the lower end of the cylinder 14.

  As described above, when the airframe is jacked up, it is necessary to attach and detach the float 15. In this case, putting an operator in the vicinity of the hydraulic cylinder 14 and manually attaching and detaching the float 15 to the tip of the cylinder 14 requires a great deal of labor for the operator, and there is a problem in workability. In the present embodiment, the float 15 is configured as follows in order to facilitate this attachment / detachment operation.

  FIG. 4 is a perspective view of the float 15 according to the present embodiment. The float 15 includes a substantially rectangular bottom plate 151, a rib 152 that is erected obliquely upward from the four corners of the bottom plate 151 toward the center, and a cylinder receiving portion 153 that is provided on the top of the rib 152. . The cylinder receiving portion 153 has a substantially cylindrical shape, and a spherical concave portion 154 is formed on the upper surface. A plurality (three in the figure) of cylinder fixing levers 16 are attached to the circumferential surface of the cylinder receiving portion 153 at equal intervals in the circumferential direction. A grip 155 for carrying the float 15 is provided on the peripheral edge of the bottom plate 151.

  FIG. 5A is a longitudinal sectional view of the main part of the float 15 showing the configuration of the attachment portion of the lever 16, and FIG. 5B is a view b in FIG. 5A. FIG. 5A also shows the shape of the lower end portion of the hydraulic cylinder 14. As shown in FIGS. 5A and 5B, a pair of brackets 156 protrudes upward from the peripheral surface of the cylinder receiving portion 153, and the lever 16 is interposed between the pair of brackets 156. ing. A pin 17 passes through the bracket 156 and the lever 16, and the lever 16 is supported by the pin 17 so as to be rotatable in a vertical plane.

  The lever 16 will be described with reference to the state of FIG. 5. The lever 16 is connected to the peripheral surface of the cylinder receiving portion 153 and the contact portion 161, and has a diameter centered on the pin 17. A circular arc portion 162 that rises in an arc shape toward the central axis L1 side, a straight portion 163 that continues to the circular arc portion 162 and rises obliquely over the pin 17, and a grip that extends obliquely downward on the radially outer side of the bracket 156 Part 164. Note that the center of gravity of the lever 16 is located radially outside the pin 17 when viewed from the axis L1, and FIG. 5 shows an initial position state in which the lever 16 is rotated in the A direction to the maximum.

  A spherical convex portion 141 corresponding to the shape of the concave portion 154 of the cylinder receiving portion 153 is formed at the lower end portion of the cylinder rod 140 of the hydraulic cylinder 14. A groove portion 142 is provided over the entire circumference above the convex portion 141, and a groove space 142 a is formed outside the groove portion 142. The outer peripheral surface 141a of the cylinder rod 140 on the lower side of the groove 142 has a smaller diameter than the upper outer peripheral surface 141b.

  A protruding portion 165 surrounded by an arc portion 162 and a straight portion 163 is formed at the tip of the lever 16. The protrusion 165 is located on the outer diameter side with respect to the circumferential surface of the groove 142 and is located on the inner diameter side with respect to the circumferential surface 141 a of the convex portion 141. As will be described later, when the convex portion 141 of the cylinder rod 140 approaches the concave portion 154 of the cylinder receiving portion 153, the groove portion 142 and the lever 16 are arranged so that the protruding portion 165 is accommodated in the groove portion 142 of the cylinder rod 140 of the hydraulic cylinder 14. Is formed.

  The lever 16 is opened with a pair of through holes 16a and 16b. In the initial position state of FIG. 5A, the through hole 16b is located obliquely below the outer diameter side of the through hole 16a when viewed from the axis L1, and the shaft portion 17a of the pin 17 passes through the inner diameter side through hole 16a. Yes.

  Next, a procedure for attaching the float 15 will be described. First, in a state where the hydraulic cylinder 14 is retracted as shown in FIG. 2, as shown in FIG. 9A, the handle 155 is gripped to lift the float 15, and the recess 154 of the cylinder receiving portion 153 is moved to the cylinder rod 140. It is made to approach the convex part 141. When the concave portion 154 of the cylinder receiving portion 153 is brought close to the convex portion 141 of the cylinder rod 140, the spherical convex portion 141 on the bottom surface of the cylinder rod comes into contact with the straight portion 163 of the lever 16, and the lever 16 is centered on the pin 17. 5 in the direction of arrow B. This state is shown in FIG. In this case, as the concave portion 154 of the cylinder receiving portion 153 approaches the convex portion 141 of the cylinder rod 140, the rotation amount of the lever 16 gradually increases.

  When the lever 15 is rotated by a predetermined amount by lifting the float 15 and causing the concave portion 154 of the cylinder receiving portion 153 to approach the convex portion 141 of the cylinder rod 140, as shown in FIG. 6, the straight portion that is the tip of the protruding portion 165 The intersection of 163 and the arc portion 162 abuts on the peripheral surface 141 a of the cylinder rod 140. At this time, the center of gravity of the lever 16 is located radially outside of the pin 17, so that a rotational force is exerted on the lever 16 due to its own weight in the direction of the arrow shown in the figure.

  When the float 15 is further lifted, the convex portion 141 on the bottom surface of the cylinder comes into spherical contact with the concave portion 154 of the cylinder receiving portion 153 as shown in FIG. In this state, the peripheral surface 141a of the convex portion 141 moves downward from the tip of the protruding portion 165, so that the lever 16 rotates by its own weight, and the contact portion 161 contacts the peripheral surface of the cylinder receiving portion 153. Stop.

  In the state of FIG. 7, the protrusion 165 of the lever 16 is positioned in the groove space 142a outside the groove 142 of the hydraulic cylinder 14, and the lever 16 is engaged with the groove 142 (engagement position). As a result, as shown in FIG. 9C, the float 15 is held at the lower end portion of the cylinder rod 140 without falling even if the hand is released from the handle 155.

  Next, the hydraulic cylinder 14 is extended, the float 15 is grounded to the ground, and a predetermined operation is performed. When working, a load in the vertical direction or the horizontal direction acts on the float 15, and in this case, the float 15 can be prevented from being detached from the lower end portion of the hydraulic cylinder 14. That is, for example, when the hydraulic cylinder 14 is pulled upward, the groove 142 of the hydraulic cylinder 14 abuts against the protrusion 165 of the lever 16. In this case, the rotation of the lever 16 in the direction of the arrow is restricted by the contact portion 161 being in contact with the peripheral surface of the cylinder receiving portion 153, so that the float 15 is prevented from dropping off from the hydraulic cylinder 14. Is done. Further, when the hydraulic cylinder 14 moves in the horizontal direction, the groove 142 abuts on any of the three levers 16 in the circumferential direction, and in this case, the lever 15 prevents the float 15 from dropping off.

  When the float 15 is removed from the state of FIG. 7, the lever 16 is rotated upward (arrow A direction) with the pin 17 as a fulcrum as shown in FIG. 16 is pushed, and the position of the pin 17 is shifted from the through hole 16a to the through hole 16b. Next, when the lever 16 is released, the lever 16 pivots downward by its own weight with the pin 17 as a fulcrum, and the lever 16 is in a state where the straight portion 163 of the lever 16 is in contact with the upper end corner of the cylinder receiving portion 153. Is retained.

  In this state, the lever 16 is retracted to the outer diameter side from the peripheral surface 141a of the cylinder rod 140 (retracted position). Therefore, when the hydraulic cylinder 14 is retracted, the cylinder rod 140 can be prevented from interfering with the lever 16, whereby the float 15 can be removed from the hydraulic cylinder 14. After the removal of the float 15, the lever 16 is lifted obliquely upward, and the position of the pin 17 is shifted from the through hole 16b to the through hole 16a. When the hand is released in this state, the lever 16 rotates by its own weight and returns to the initial state of FIG.

According to the above embodiment, the following effects can be obtained.
(1) A plurality of levers 16 are provided at the upper end of the float 15 so as to be rotatable in the vertical direction, and the protrusions 165 at the tip of the lever are engaged with the grooves 142 on the circumferential surface of the cylinder rod 140 by the rotation of the lever 16. I made it. Thereby, the upper end part of the float 15 can be easily attached to the lower end part of the hydraulic cylinder 14.
(2) Lifting the float 15 and causing the concave portion 154 of the cylinder receiving portion 153 to approach the convex portion 141 of the cylinder rod 140 causes the protrusion 165 of the lever 16 to rotate downward and the peripheral surface 141a of the cylinder rod 140. Is moved downward from the protrusion 165, and then the protrusion 165 is rotated upward by the weight of the lever 16 (FIGS. 6 and 7). Thus, the protrusion 165 can be engaged with the groove 142 on the circumferential surface of the cylinder rod only by lifting the float 15, and the float 15 can be easily attached.

(3) Since the lever 16 can be held in a state where it is retracted to the outer diameter side from the peripheral surface 141a of the cylinder rod 140 (FIG. 8), the float 15 can be easily moved from the lower end of the cylinder rod 140 by the contraction of the hydraulic cylinder 14. Can be removed.
(4) Since the lever 16 is provided with a pair of through holes 16a and 16b, after the lever 16 is rotated upward, the lever 16 is pushed obliquely downward, and the position of the pin 17 is changed from the through hole 16a to the through hole 16b. The lever 16 can be easily held in the retracted position simply by shifting.
(5) Since the lever 16 is rotated by its own weight, the contact portion 161 of the lever 16 is held in contact with the peripheral surface (side surface) of the cylinder receiving portion 153 (FIG. 7). It can be easily held in the engaged position, and the float 15 can be prevented from falling off.
(6) Since the concave portion 154 on the upper surface of the cylinder receiving portion 153 and the convex portion 141 on the bottom surface of the cylinder rod 140 have spherical shapes, the displacement between the axes of the hydraulic cylinder 14 and the float 15 can be absorbed.

  In the above-described embodiment, the lever 16 is movably supported by the pin 17 between the engagement position where the protrusion 165 engages with the groove 142 (FIG. 7) and the retraction position where the protrusion 165 retracts from the groove 142 (FIG. 8). However, the configuration of the support means is not limited to this. The configuration of the lever 16 as the lever member is not limited to that described above. Although a pair of through holes 16a and 16b are formed in the lever 16 in the shape of a long hole and the position of the pin 17 is shifted to hold the lever 16 in the retracted position, the holding mechanism is not limited to this. For example, the lever 16 may be held in the retracted position by using the rotating portion of the lever 16 as a ratchet mechanism. A link mechanism can also be used. Although the lever 16 is provided with the contact portion 161 to limit the amount of rotation of the lever 16 to hold the lever 16 at the engagement position, the configuration of the stopper portion is not limited to this.

  In the above embodiment, the traveling body 1 is provided with the hydraulic cylinder 14 and the traveling body 1 and the swing body 2 are integrally jacked up. However, for example, the swing body 2 is provided with a hydraulic cylinder and only the swing body 2 is jacked up. You may make it do. Although the said embodiment was applied to the crawler crane, this invention is applicable similarly to the other construction machine which attaches the upper part of a float to the lower part of the cylinder for jackup so that attachment or detachment is possible. That is, as long as the features and functions of the present invention can be realized, the present invention is not limited to the construction machine float mounting device according to the embodiment.

1 is an external side view of a crawler crane according to an embodiment of the present invention. The front view of the crane of FIG. The front view which shows the jack-up state of a crane. The perspective view of the float concerning this Embodiment. The enlarged view which shows the principal part structure of a float. The figure which shows the state which has a lever in the middle of engagement. The figure which shows the state which has a lever in an engagement position. The figure which shows the state which has a lever in a retracted position. The figure which shows the attachment procedure of the float which concerns on this Embodiment.

Explanation of symbols

14 Hydraulic cylinder 15 Float 16 Lever 16a, 16b Through hole 17 Pin 142 Groove part 161 Contact part 165 Projection part

Claims (3)

A float mounting device for a construction machine that detachably attaches the upper end of a float to the lower end of a jack cylinder that jacks up the airframe,
A lever member attached to a cylinder receiver provided at the upper end of the float;
Support means for movably supporting the lever member at an engagement position that engages with a groove formed on a lower outer peripheral surface of the jack cylinder and a retreat position that retreats to the outer diameter side from the lower outer peripheral surface;
A holding mechanism for holding the lever member in the retracted position ;
The support means supports the lever member so as to be rotatable in the vertical direction on a bracket provided on the outer diameter side of the lower outer peripheral surface of the jack cylinder and on the upper portion of the cylinder receiving portion of the float,
The lever member has a through-hole through which the support means passes, a center of gravity is provided on the outer diameter side of the through-hole with respect to the axis of the jack cylinder, and the axis with respect to the axis of the jack cylinder On the inner diameter side of the through hole, when the float cylinder receiving part approaches the bottom surface of the jack cylinder, there is a protrusion that is pressed against the bottom surface of the jack cylinder and rotates the lever member upward. Provided,
When the protrusion is in contact with and pressed against the bottom surface of the jack cylinder, the lever member is rotated upward, and after the contact is released, the protrusion is rotated upward by the weight of the lever member and the groove portion A float mounting device for a construction machine, which is engaged with In the float mounting apparatus of the construction machine according to claim 1 ,
A float mounting device for a construction machine, wherein the lever member is provided with a stopper portion that abuts against a side surface of a cylinder receiving portion of the float to hold the lever member in an engaged position. In the float mounting apparatus of the construction machine according to claim 1 or 2 ,
The lever member is provided with a pair of through holes that are continuous in a long hole shape through which the support means passes,
The float mounting apparatus for a construction machine, wherein the holding mechanism holds the lever member at the retracted position through one of the pair of through holes.

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