JP2006206232A - Telescopic boom vertical deflection restricting device for travelling crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telescopic boom vertical deflection restricting device to be fitted to a travelling crane for crane work by properly selecting the crane work in the tip of the telescopic boom and the crane work in the tip of a jib and having an effect for restricting vertical deflection of the telescopic boom caused by the bending moment from the jib working to the tip of the telescopic boom. <P>SOLUTION: An arm means 13 capable of changing extension quantity thereof toward a back surface side of the telescopic boom 3 is provided by fitting to the tip part 3a of the telescopic boom 3, and a tip part of a guy rope 10 is connected to an extension end part of the arm means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a telescopic boom vertical deflection suppressing device for a mobile crane.

    First, a mobile crane as an application target of the telescopic boom vertical deflection suppressing device of the present invention will be described with reference to FIG. In FIG. 9, A shows a mobile crane, and this mobile crane A has a swivel base 2 mounted on a vehicle 1 so as to be capable of swivel drive, and a swivel base 2 whose base end portion is connected so as to be able to be raised and lowered. A telescopic boom 3 that is driven up and down by a telescopic boom hoisting hydraulic cylinder 4 interposed therebetween, and a jib 5 that is detachably added to the distal end portion 3a of the telescopic boom 3. The jib 5 is of a type that is added to the distal end portion 3a of the telescopic boom 3 so that the falling direction moment acting on the jib 5 gives a bending moment to the distal end portion 3a of the telescopic boom 3, and in addition to the telescopic boom 3 in the added state. The undulation angle can be changed.

  In the jib 5 shown in FIG. 9, the base end portion of the jib attachment frame 6 that is detachably attached to the distal end portion 3 a of the telescopic boom 3 is connected so as to be raised and lowered, and is interposed between the jib attachment frame 6. The jib hoisting hydraulic cylinder 7 can change the hoisting angle with respect to the telescopic boom 3 to an arbitrary angle. Here, the jib 5 is detachably added to the distal end portion 3a of the telescopic boom 3 via the jib attachment frame 6.

  The crane work by the mobile crane A includes “crane work at the tip of the telescopic boom 3” (crane work without the jib 5 being added to the tip 3a of the telescopic boom 3) and “crane work at the tip of the jib”. (Crane work with the jib 5 added to the distal end 3a of the telescopic boom 3) is appropriately selected and performed.

  “Crane work at the distal end of the telescopic boom” means that the swivel 2 is driven to swing and extend and retract after the suspended load 8 is hooked to the distal end 3a of the telescopic boom 3 so that the hoisting and lowering can be freely driven. The boom 3 undulation and expansion / contraction drive and the hoisting / lowering drive of the hoisting tool 8 are performed in combination, and the “crane work at the jib tip” is suspended at the tip of the jib 4 so that the hoisting / lowering can be driven. After the suspended load W is locked to the hanging tool 9, the turning drive of the swivel base 2, the raising / lowering driving of the telescopic boom 3, the raising / lowering driving of the jib 5, and the hoisting / lowering driving of the hanging tool 9 are used in combination. Do. In addition, when the jib 5 is a telescopic jib that can be freely extended and retracted, the crane work is performed using the expansion and contraction driving of the jib 4 together.

  The present invention is a novel telescopic boom that is attached to the mobile crane A configured as described above and suppresses the vertical deflection of the telescopic boom 3 (the flexure such that the longitudinal intermediate portion of the telescopic boom 3 is convex upward). An object of the present invention is to provide a vertical deflection suppressing device.

  By the way, in the mobile crane which does not have the jib 5 detachably attached to the distal end 3a of the telescopic boom 3 (the mobile crane that performs only “crane work at the distal end of the telescopic boom”), the telescopic boom 3 at the time of the crane work. It has already been known to attach a telescopic boom vertical deflection suppressing device in order to suppress vertical deflection. This conventionally known telescopic boom vertical deflection suppressing device B is appropriately selected from the mobile crane A shown in FIG. 9 and described above ("crane work at the telescopic boom tip" and "crane work at the jib tip"). Since it is easy for those skilled in the art to adopt the mobile crane A) as it is, such a known telescopic boom vertical deflection suppressing device B is added on FIG. Shown as prior art.

  In FIG. 9, the telescopic boom vertical deflection suppressing device B is attached to a guy rope 10, a telescopic boom 3 longitudinal direction intermediate part or a swivel base 2 having its distal end directly connected to the distal end 3 a of the telescopic boom 3 or the base end of the guy rope 10. The guy rope base end connecting means 11 for connecting the parts at positions spaced apart from the telescopic boom longitudinal axis 3c to the telescopic boom back side, and the guy rope 10 between the telescopic boom 3 tip 3a and the guy rope base end connecting means 11 It is comprised with the guy rope length adjustment means 12 which adjusts the tension length of this.

The guy rope length adjusting means 12 is constituted by a guy rope winding winch arranged in the guy rope base end connecting means 12 in FIG. 9, but this guy rope length adjusting means 12 is attached to the distal end 3a of the telescopic boom 3. Some are also present.
Further, in FIG. 9, the guy rope base end connecting means 11 arranged on the swivel base 2 is shown by a solid line, but the guy rope base end connecting means 11 is shown by a virtual line in FIG. A geimast erected on the base end side (longitudinal middle portion of the telescopic boom 3) of the telescopic boom 3 so that the extending end portion is located at a position separated from the telescopic boom longitudinal axis 3c on the rear side of the telescopic boom 3 11, and the base end portion of the guy rope 10 may be connected to the extending end portion of the guy mast 11. In the phantom line illustration of FIG. 9, 11 a is a guide rope for preventing forward tilting of the moth mast, which is stretched between the extended end of the moth mast 11 constituting the tie rope basal end connecting means and the base end of the telescopic boom 3. Show.

  In the conventional telescopic boom vertical deflection suppressing device B, the distal end portion of the guy rope 10 is directly connected to the distal end portion 3a of the telescopic boom 3, and the connecting portion is in a position close to the telescopic boom longitudinal axis 3c. ing.

  Such a telescopic boom bending suppression device B is used in a state where the guy rope 10 stretched between the distal end 3a of the telescopic boom 3 and the guy rope base end connecting means 11 is in a tension state prior to the crane work. Sometimes the downward load acting on the distal end 3a of the telescopic boom 3 (in the "crane operation at the distal end of the telescopic boom", the downward load due to the suspended load W locked to the hanging tool 8, and in the "crane operation at the jib distal end", The suspended load W and the downward load due to the own weight of the jib 5) are applied to the compressive force of the telescopic boom 3 by the guy rope 10 (the force to contract the telescopic boom 3 along its longitudinal axis 3c). The effect of suppressing the vertical bending of the telescopic boom 3 (the bending in which the central portion in the longitudinal direction of the telescopic boom 3 is convex upward) (hereinafter referred to as “downward load acting on the distal end of the telescopic boom”) Vertical deflection with a) that the effect of suppressing "the night.

"The effect of suppressing the vertical deflection due to the downward load acting on the telescopic boom tip" is expected not only in "crane work at the telescopic boom 3 tip 3a" but also "crane work at the jib 5 tip" It is something that can be done.
JP-A-55-119693

  In the “crane operation at the distal end of the telescopic boom”, only the downward load from the suspended load W locked to the suspension tool 8 acts on the distal end 3a of the telescopic boom 3, so that the conventional telescopic boom vertical as described above is used. The deflection suppressing device B functions extremely effectively for suppressing the vertical deflection of the telescopic boom 3.

  However, in “crane work at the jib tip”, in addition to the downward load caused by the suspended load W and the jib 5 own weight acting on the tip 3a of the telescopic boom 3, a bending moment is applied. Works.

  The bending moment is supported by the distal end 2a of the telescopic boom 3 on the jib lying direction moment acting on the jib 5 based on the weight W of the suspended load 9 and the own weight of the jib 5 suspended on the distal end of the jib 5. For this reason, the conventionally known telescopic boom vertical deflection suppressing device B cannot generate a force (reverse bending moment) against the bending moment.

  This is because the connecting portion of the distal end portion of the guy rope 10 to the distal end portion 3a of the telescopic boom 3 in the conventionally known telescopic boom vertical deflection suppressing device B is expanded and contracted at a position close to the telescopic boom longitudinal axis 3c in a side view of the telescopic boom 3. This is because the force (reverse bending moment) applied to the distal end 3a of the telescopic boom 3 due to the tension generated in the guy rope 10 is extremely small because it is set at the distal end 3a of the boom 3.

  The above bending moment acting on the distal end portion 3a of the telescopic boom 3 in the "crane work at the jib distal end portion" causes a vertical deflection of the telescopic boom 3, and this bending moment causes the operation of the jib 5. It fluctuates greatly depending on the state (an operating state in which the undulation angle of the jib 5 and the weight of the suspended load W are used as parameters, and if the length of the jib 5 is adjustable, the length of the jib 5 is also a parameter for determining the operating state).

  That is, when a conventionally known telescopic boom vertical deflection suppression device B is installed in a mobile crane that performs crane work by appropriately selecting “crane work at the telescopic boom tip” and “crane work at the jib tip” The telescopic boom vertical deflection suppressing device B has an effect of suppressing the vertical deflection of the telescopic boom 3 based on the bending moment from the jib 5 acting on the distal end portion 3a of the telescopic boom 3 in the “crane work at the jib distal end portion” (hereinafter, “ The effect of “suppressing the vertical deflection of the telescopic boom due to the bending moment from the jib acting on the distal end of the telescopic boom” is hardly produced. For this reason, there arises a problem that the lifting allowable load in “crane work at the jib tip” must be limited by the strength of the telescopic boom 3 with respect to the bending moment from the jib 5 acting on the tip 3a of the telescopic boom 3.

  The present invention is attached to the mobile crane A that performs crane work by appropriately selecting “crane work at the telescopic boom front end” and “crane work at the jib front end”. It is an object of the present invention to provide a telescopic boom vertical deflection suppressing device having “an effect of suppressing vertical deflection of the telescopic boom caused by a bending moment from the jib acting on the distal end portion of the telescopic boom”.

    The present invention is a mobile crane as described above, that is, a swivel base 2 that is mounted on a vehicle 1 so as to be capable of swiveling, and a base end portion of the swivel base 2 is connected to the swivel base 2 so that it can be raised and lowered. The telescopic boom 3 that is driven up and down by the telescopic boom hoisting hydraulic cylinder 4 and the tilting direction moment acting on the telescopic boom 3 are removably added to the front end 3a of the telescopic boom 3 so that a bending moment is applied to the front end 3a of the telescopic boom 3. A telescopic boom longitudinal deflection restraining device C attached to a mobile crane having a jib 5 that can change the undulation angle with respect to the telescopic boom 3. It is.

(About the structure of the expansion-contraction boom vertical bending suppression apparatus of Claim 1)
The telescopic boom vertical deflection restraining device C according to claim 1 of the present invention is an arm means 13 attached to the distal end portion 3a of the telescopic boom 3 and capable of changing the amount of extension to the rear side of the telescopic boom 3, and its distal end portion as the arm. The guy rope 10 connected to the extending end of the means 13, the middle part of the telescopic boom 3 in the longitudinal direction or the swivel base 4, and the base end of the guy rope 10 is separated from the telescopic boom longitudinal axis 3 c to the rear side of the telescopic boom 3. A guy rope base end connecting means 11 for connecting at the position, and a guy rope length adjusting means 12 for adjusting the extension length of the guy rope 10 between the arm means 13 and the guy rope base end connecting means 11. Yes.

  In addition, the telescopic boom vertical deflection suppressing device C according to claim 1 is connected to the distal end portion of the guy rope 10 and the distal end portion 3a of the telescopic boom 3 with respect to the above-described conventionally known telescopic boom vertical deflection suppressing device B. Only different. That is, in the conventionally known telescopic boom vertical deflection suppressing device B, the distal end portion of the guy rope 10 is directly coupled to the distal end portion 3a of the telescopic boom 3 and the coupling position is close to the telescopic boom longitudinal axis 3c. However, the telescopic boom vertical deflection restraining device C according to claim 1 of the present invention attaches the arm means 13 capable of changing the extension amount to the back side of the telescopic boom 3 to the distal end portion 3a of the telescopic boom 3, and The leading end is connected to the extending end of the arm means 13. About the structure except the connection structure of the front-end | tip part of the guy rope 10, and the expansion-contraction boom 3 front-end | tip part 3a, it has the same structure as the conventionally well-known expansion-contraction boom vertical bending suppression apparatus B mentioned above.

(About the structure of the expansion-contraction boom vertical bending suppression apparatus of Claim 2)
The telescopic boom vertical deflection suppressing device according to claim 2 of the present invention is dependent on claim 1, and is an arm attached to the distal end portion 3a of the telescopic boom 3 and capable of changing the extension amount to the back side of the telescopic boom 3. The configuration of the means 13 is specifically specified.

That is, the arm means 13 has a pivot arm 14 whose base end is pivotally attached to the distal end 3a of the telescopic boom 3 so that the amount of extension to the rear side of the telescopic boom 3 can be changed by the pivoting of the arm means 13. The rotating arm 14 is composed of an arm rotating hydraulic cylinder 15 that rotates.
(About the structure of the telescopic boom vertical bending suppression apparatus of Claim 3)
The telescopic boom vertical deflection suppressing device according to claim 3 of the present invention is dependent on claim 1, and is attached to the distal end portion 3a of the telescopic boom 3 to the rear side of the telescopic boom 3 as in the case of the second aspect. The configuration of the arm means capable of changing the extension amount is specifically specified.

That is, the arm means 13 is extended and retracted by extending and retracting the telescopic arm 17 with its base end erected at the distal end of the telescopic boom so that the amount of extension to the back side of the telescopic boom 3 can be changed by expansion and contraction. This is composed of an arm expansion / contraction hydraulic cylinder 18.
(About the structure of the vertical bending suppression apparatus of the expansion-contraction boom of Claim 4)
The telescopic boom vertical deflection suppressing device C according to the fourth aspect of the present invention is dependent on the first to third aspects, and specifically the configuration of attaching the jib 5 and the arm means to the distal end portion 3a of the telescopic boom 3. It has been identified.

That is, the jib 4 is attached to a jib attachment frame 6 detachably attached to the distal end portion of the telescopic boom via a jib raising / lowering hydraulic cylinder 7 so as to be driven up and down, and the arm means 13 is connected to the jib attachment frame 6. It is characterized by being attached to.
(About the structure of the expansion-contraction boom vertical bending suppression apparatus of Claim 5)
The telescopic boom vertical deflection restraining device C according to claim 5 of the present invention is dependent on claims 1 to 4, and includes arm means 13, guy rope 10, guy rope base end connecting means 11, and guy rope length. A pair of left and right telescopic boom vertical deflection suppression devices C each including an adjusting means 12 are provided.

  That is, the arm means 13 disposed at the distal end 3a of the telescopic boom 3, the guy rope 10 having the distal end connected to the distal end 3a of the telescopic boom 3 via the arm means, the proximal end of the telescopic boom 3 or the swivel base 2 Guy rope base end connecting means 11 for connecting the base end portion of the guy rope 10 at a position spaced apart from the telescopic boom longitudinal axis 3c on the back side of the telescopic boom 3, and a guy rope for adjusting the extension length of the guy rope 10 The telescopic boom vertical deflection restraining device C constituted by the length adjusting means 12 has a pair of left and right so that the extending path of the guy rope 10 passes through the left and right of the telescopic boom longitudinal axis 3c in the rear view of the telescopic boom 3. It is characterized by being equipped.

(Effect of the telescopic boom vertical deflection suppressing device according to claim 1)
The telescopic boom vertical deflection suppressing device C according to claim 1 configured as described above has the following effects.
(1) In "crane work at the jib tip", a bending moment acting on the tip 3a of the telescopic boom 3 (due to the suspended load W suspended on the lifting tool 9 suspended at the tip of the jib 5 and the own weight of the jib 5) It is possible to apply a reverse bending moment to the distal end portion 3a of the telescopic boom 3 to counteract that based on the jib overturning moment. Since the bending moment acting on the distal end portion 3a of the telescopic boom 3 is greatly reduced or eliminated by the reverse bending moment, the telescopic boom vertical deflection suppressing device C according to claim 1 is "from the jib acting on the distal end portion of the telescopic boom. The effect of suppressing the vertical deflection of the telescopic boom caused by the bending moment can be achieved.
(2) Moreover, the jib 5 which acts on the front-end | tip part 3a of the telescopic boom 3 by changing suitably the extension amount to the back side of the telescopic boom 3 of the extended end part of the arm means 13 according to the operating state of the jib 5. The bending moment from the side and the opposite bending moment can be made substantially equal to each other, so that the bending of the telescopic boom due to both the bending moments (so that the middle part in the longitudinal direction of the telescopic boom 3 is convex upward or downward) Can be reasonably eliminated.

In addition, since the said arm means 13 is firmly attached to the front-end | tip part 3a of the expansion-contraction boom 3 in the use condition, since the expansion-contraction boom vertical bending suppression apparatus C which concerns on this invention is the conventional expansion-contraction boom vertical bending suppression apparatus B, Similarly, it is clear that “the effect of suppressing the vertical deflection of the telescopic boom caused by the downward load acting on the distal end portion of the telescopic boom” is provided.
(Effect of the telescopic boom vertical deflection suppressing device according to claim 2)
The telescopic boom vertical deflection suppressing device C according to claim 2 configured as described above has the same effect as that of the above-described first aspect, and is attached to the distal end portion 3a of the telescopic boom 3 to the rear side of the telescopic boom 3. The arm means 13 that can change the extension amount can be realized with a simple configuration.
(Effect of the telescopic boom vertical deflection suppressing device according to claim 3)
The telescopic boom vertical deflection restraining device C according to claim 3 configured as described above has the same effect as that of the above-described claim 1, and is attached to the distal end portion 3a of the telescopic boom 3 to the rear side of the telescopic boom 3. The arm means capable of changing the extension amount can be realized with a simple configuration.
(About the effect of the expansion-contraction boom vertical bending suppression apparatus of Claim 4)
The telescopic boom vertical deflection restraining device C according to claim 4 configured as described above has the effects of claims 1 to 3 dependent on claim 4, and the jib attachment frame 6 is connected to the distal end 3 a of the telescopic boom 3. By detachably attaching, the jib 5 can be added to the distal end 3a of the telescopic boom 3 together with the arm means 13, so that the jib 5 can be easily added to and removed from the distal end 3a of the telescopic boom 3. .
(About the effect of the expansion-contraction boom vertical bending suppression apparatus of Claim 5)
The telescopic boom vertical deflection suppressing device C according to claim 5 configured as described above has the effects of claims 1 to 4 dependent on claim 5, and the left and right telescopic boom vertical deflection suppressing devices C are Since the joint movement of the distal end 3a of the telescopic boom 3 in the lateral direction (the movement in the direction perpendicular to the undulation trajectory plane of the telescopic boom 3) is constrained, the lateral boom of the telescopic boom 3 is effectively suppressed.

  Hereinafter, an embodiment of a telescopic boom vertical deflection suppressing device for a mobile crane according to the present invention will be described with reference to FIGS. 1 to 8.

  As described above, the telescopic boom vertical deflection suppressing device C of the present invention is intended for the mobile crane A shown in FIG. 9 and described above. Compared to the deflection suppression device B (known as a telescopic boom vertical deflection suppression device for a mobile crane that performs only “crane work at the distal end of the telescopic boom”), the distal end portion of the guy rope 10 and the distal end portion of the telescopic boom 3 Only the connection configuration with 3a is different.

  Therefore, in the following description, mainly the difference (the connection configuration between the distal end portion of the guy rope 10 and the distal end portion 3a of the telescopic boom 3) will be mainly described, and the other configuration will be described with reference to the mobile crane A shown in FIG. And description of the conventional telescopic boom vertical bending suppression apparatus B shall be used as it is.

  1 to 8, the telescopic boom vertical deflection suppressing device of the present invention is indicated as C. This telescopic boom vertical deflection suppressing device C is provided with an arm means 13 attached to the distal end portion 3a of the telescopic boom 3 and capable of changing the amount of extension to the rear side of the telescopic boom 3, and the distal end portion of the arm means 13 as an extended end portion. Guy rope base connected to the telescopic boom 3, the middle part of the telescopic boom 3 in the longitudinal direction or the swivel 4 and the base end of the guy rope 10 is coupled to the rear side of the telescopic boom 3 from the telescopic boom longitudinal axis 3c. It comprises end connecting means 11 and guy rope length adjusting means 12 for adjusting the stretched length of the guy rope 10 between the arm means and the guy rope base end connecting means 11. The distal end portion of the guy rope 10 is connected to the distal end portion 3a of the telescopic boom 3 via an arm means 13 attached to the distal end portion 3a of the telescopic boom 3 and capable of changing the amount of extension to the rear side of the telescopic boom 3. .

(About the first embodiment)
FIG. 1 shows a first embodiment. In FIG. 1, the arm means 13 attached to the distal end 3a of the telescopic boom 3 and capable of changing the extension amount to the rear side of the telescopic boom 3 can change the extension amount to the rear side of the telescopic boom 3 by its rotation. The base end portion is composed of a turning arm 14 rotatably attached to the distal end portion 3 a of the telescopic boom 3 and an arm turning hydraulic cylinder 15 for turning the turning arm 14. The distal end portion of the guy rope 10 is connected to the extended end portion (the distal end portion) of the rotating arm 14.

  In FIG. 1, the arm means 13 is attached to a jib attachment frame 6 that is detachably attached to the distal end portion 3 a of the telescopic boom 3. In other words, the pivot arm 14 of the arm means 13 has its proximal end attached to the back side of the jib attachment frame 6 via the pivot shaft 16 so as to be raised and lowered along the raising and lowering surface of the telescopic boom 3. The arm turning hydraulic cylinder 15 of the means 13 is interposed between the turning arm 14 and the jib attachment frame 6.

  Then, by turning the turning arm 13 by the arm turning hydraulic cylinder 14, the extension amount of the extending end portion (tip portion) of the turning arm 13 to the back side of the telescopic boom 3 can be changed. ing.

  This first embodiment embodies the telescopic boom vertical deflection suppressing device according to claim 1, claim 2, and claim 4, the effect of which is as described in the column of the effect of the invention.

(About the second embodiment)
FIG. 2 shows a second embodiment. In FIG. 2, the arm means 13 that is attached to the distal end portion 3a of the telescopic boom and that can be changed to the rear side of the telescopic boom 3 expands and contracts its base end portion so that the extension amount to the rear side of the telescopic boom can be changed. The telescopic arm 17 is erected on the tip of the boom, and the arm telescopic hydraulic cylinder 18 extends and contracts the telescopic arm 17. The distal end portion of the guy rope 10 is connected to the extended end portion (the distal end portion) of the telescopic arm 17.

  In FIG. 2, the arm means 13 is attached to a jib attachment frame 6 that is detachably attached to the distal end portion 3 a of the telescopic boom 3. That is, the telescopic arm 17 of the arm means 13 is erected with its base end fixed to the jib attachment frame 6, and the arm telescopic hydraulic cylinder 18 of the arm means 13 is built in the telescopic arm 16. . Then, by extending and retracting the telescopic arm 16 by means of the arm telescopic hydraulic cylinder 17, the extension amount of the extending end portion (tip portion) of the telescopic arm 16 to the back side of the telescopic boom 3 can be changed.

  The second embodiment embodies the telescopic boom vertical deflection suppressing device according to claims 1, 3 and 4, and the effect thereof is as described in the column of the effect of the invention.

  In the first embodiment and the second embodiment described above, the arm means 13 disposed at the distal end 3a of the telescopic boom 3, the guy rope 10 having its distal end connected to the distal end of the telescopic boom via the arm means 13, and the three telescopic booms Guy rope base end connecting means 11 disposed on the end or swivel 2 and connecting the base end of the guy rope 10 at a position spaced apart from the telescopic boom longitudinal axis 3c on the back side of the telescopic boom 3; Although the telescopic boom vertical deflection suppressing device C constituted by the guy rope length adjusting means 12 for adjusting the tension length of 10 is shown attached to the telescopic boom 3, this telescopic boom vertical deflection suppressing device C is shown. These can be attached to the telescopic boom 3 as a pair of left and right, that is, two.

  Hereinafter, as a third to a fourth embodiment, a description will be given of an embodiment in which the telescopic boom vertical deflection suppressing device C is disposed on the telescopic boom 3 in a pair of left and right.

(About the third embodiment)
As shown in FIGS. 3 to 5, the pair of left and right telescopic boom vertical deflection suppression devices C and C attached to the telescopic boom 3 are configured such that the extending paths of the guy ropes 10 and 10 are respectively in the rear view of the telescopic boom 3. It arrange | positions so that the right and left of the telescopic boom longitudinal axis 3c may pass.

  The telescopic boom longitudinal deflection restraining device C on the left and right sides of the telescopic boom 3 (left and right sides of the telescopic boom 3 in the rear view of the telescopic boom 3) is the same as that of the first and second embodiments described above. The arm means 13 disposed in the section 3a, the guy rope 10 having its distal end connected to the distal end of the telescopic boom via the arm means 13, the base end of the telescopic boom 3 or the swivel 2 and the base end of the guy rope 10 A guy rope base end coupling means 11 that is coupled to the telescopic boom longitudinal axis 3c at a position spaced apart on the back side of the telescopic boom 3 and a guy rope length adjusting means 12 that adjusts the extension length of the guy rope 10 It is composed.

  Each arm means 13 is similar to that of the first embodiment described above, and a rotating arm 14 attached to a jib attachment frame 6 removably attached to the distal end 3a of the telescopic boom 3 via a rotating shaft 16, and The rotating arm 14 is composed of an arm rotating hydraulic cylinder 15 that rotates around a rotating shaft 16.

  The rotating arm 14 in the arm means 13 of the telescopic boom vertical deflection suppressing device C located on the left side is tilted toward the left side of the telescopic boom 3 and the standing position standing up toward the back side of the telescopic boom 3. By this rotation, the extension amount of the extension end portion (tip portion) to the back side of the telescopic boom 3 can be changed. The pivot shaft 16 that connects the base end of the left pivot arm 14 to the jib attachment frame 6 and the arm pivot hydraulic cylinder 15 that pivots the left pivot arm 14 are provided on the left pivot arm 14. It arrange | positions so that such rotation is possible.

  Further, the guy rope base end connecting means 11 of the telescopic boom other vertical deflection suppressing device C located on the left side is attached to the swivel base 2 or the telescopic boom 3 in the longitudinal middle part, and the base end part of the guy rope 10 is connected to the telescopic boom. 3 Separated from the longitudinal axis 3c to the back side of the telescopic boom (separated from the back side of the telescopic boom in the side view of the telescopic boom 3) and separated to the left side of the telescopic boom 3 (to the left side of the telescopic boom 3 in the rear view of the telescopic boom 3) It is designed to be connected at a separated position.

  For this reason, the guy rope of the telescopic boom vertical deflection suppressing device C located on the left side is stretched via the left side of the telescopic boom longitudinal axis 3c in the rear view of the telescopic boom.

  The rotating arm 14 in the arm means 13 of the telescopic boom vertical deflection suppressing device C located on the right side is tilted toward the right side of the telescopic boom 3 and the standing position standing up toward the back side of the telescopic boom 3. By this rotation, the extension amount of the extension end portion (tip portion) to the back side of the telescopic boom 3 can be changed. The pivot shaft 16 that connects the base end of the right pivot arm 14 to the jib attachment frame 6 and the arm pivot hydraulic cylinder 15 that pivots the right pivot arm 14 include a right pivot arm. It arrange | positions so that such 14 rotation may be possible.

  Further, the guy rope base end connecting means 11 of the telescopic boom other vertical deflection suppressing device C located on the right side is attached to the swivel base 2 or the telescopic boom 3 in the middle in the longitudinal direction, and the base end of the guy rope 10 is connected to the telescopic boom. 3 Position separated from the longitudinal axis 3c to the back side of the telescopic boom (separated to the back side of the telescopic boom in a side view) and separated to the right side of the telescopic boom 3 (separated to the right side of the telescopic boom 3 in the rear view of the telescopic boom 3) It comes to be connected with.

  For this reason, the guy rope of the telescopic boom vertical deflection suppressing device C located on the right side is stretched via the right side of the telescopic boom longitudinal axis 3c in the rear view of the telescopic boom.

  The left and right telescopic boom vertical deflection restraining devices C are arranged on the telescopic boom 3 in a surface-oriented manner with the undulation locus surface of the telescopic boom 3 as a target surface.

  The third embodiment embodies the telescopic boom vertical deflection suppressing device according to claims 1, 2, 4, and 5, and the effect thereof is as described in the column of the effect of the invention. It is.

(About the fourth embodiment)
The telescopic boom vertical deflection suppressing device C according to the fourth embodiment shown in FIGS. 6 to 8 is a pair of left and right telescopic boom vertical deflection suppressing devices C attached to the telescopic boom 3, respectively. However, it is arrange | positioned so that the right and left of the expansion-contraction boom longitudinal axis 3c may pass in the rear view of the expansion-contraction boom 3. FIG.

  The telescopic boom vertical deflection restraining devices C and C on the left and right sides of the telescopic boom 3 (left and right sides of the telescopic boom 3 in the rear view of the telescopic boom 3) are the telescopic booms as in the first and second embodiments. 3 Arm means 13 disposed at the distal end portion 3a, Guy rope 10 having the distal end portion connected to the distal end portion of the telescopic boom via the arm means 13, the base end portion of the telescopic boom 3 or the swivel base 2 and the proximal end of the guy rope 10 Guy rope base end connecting means 11 for connecting the parts at positions separated from the telescopic boom longitudinal axis 3c on the rear side of the telescopic boom 3, and guy rope length adjusting means 12 for adjusting the extension length of the guy rope 10 It consists of and.

  As with the second embodiment, each arm means 13 is provided with a telescopic arm 17 fixedly attached to a jib mounting frame 6 detachably attached to the distal end portion 3a of the telescopic boom 3, and a telescopic arm 17 that is telescopically driven. The arm expansion / contraction hydraulic cylinder 18 is configured.

  The telescopic arm 17 in the arm means 13 of the telescopic boom vertical deflection restraining device C located on the left side is disposed to be inclined to the upper left side of the telescopic boom 3 distal end portion 3a via the jib attachment frame pair 6 and is expanded and contracted. The extending amount of the extending end portion (tip portion) to the back side of the telescopic boom 3 can be changed.

  Further, the guy rope base end connecting means 11 of the telescopic boom other vertical deflection suppressing device C located on the left side is attached to the swivel base 2 or the telescopic boom 3 in the longitudinal middle part, and the base end of the guy rope 10 is connected to the telescopic boom. 3 Separated from the longitudinal axis 3c to the back side of the telescopic boom (separated from the back side of the telescopic boom in the side view of the telescopic boom 3) and separated to the left side of the telescopic boom 3 (to the left side of the telescopic boom 3 in the rear view of the telescopic boom 3) It is designed to be connected at a separated position.

  For this reason, the guy rope of the telescopic boom vertical deflection suppressing device C located on the left side is stretched via the left side of the telescopic boom longitudinal axis 3c in the rear view of the telescopic boom.

  The telescopic arm 17 in the arm means 13 of the telescopic boom vertical deflection restraining device C located on the right side is disposed to be inclined to the upper right side of the distal end portion 3a of the telescopic boom 3 via the jib attachment frame pair 6, and by this expansion and contraction. The extension amount of the extension end portion (tip portion) to the back side of the telescopic boom 3 can be changed.

  Further, the guy rope base end connecting means 11 of the telescopic boom other vertical deflection suppressing device C located on the right side is attached to the swivel base 2 or the telescopic boom 3 in the middle in the longitudinal direction, and the base end of the guy rope 10 is connected to the telescopic boom. 3 Separated from the longitudinal axis 3c to the back side of the telescopic boom (separated from the back side of the telescopic boom in the side view of the telescopic boom 3) and separated to the right side of the telescopic boom 3 (to the left side of the telescopic boom 3 in the rear view of the telescopic boom 3) It is designed to be connected at a separated position.

  For this reason, the guy rope of the telescopic boom vertical deflection suppressing device C located on the right side is stretched via the right side of the telescopic boom longitudinal axis 3c in the rear view of the telescopic boom.

  The left and right telescopic boom vertical deflection restraining devices C are arranged on the telescopic boom 3 in a surface-oriented manner with the undulation locus surface of the telescopic boom 3 as a target surface.

  This third embodiment embodies the telescopic boom vertical deflection suppressing device C according to claims 1, 3, 4, and 5, and the effect thereof has been described in the column of the effect of the invention. Street.

1 is a side view of a mobile crane equipped with a telescopic boom vertical deflection suppressing device according to a first embodiment of the present invention. It is a side view of the mobile crane equipped with the expansion-contraction boom vertical bending suppression apparatus which concerns on 2nd Example of this invention. It is a side view of the mobile crane equipped with the expansion-contraction boom vertical bending suppression apparatus which concerns on 3rd Example of this invention. It is a telescopic boom back view of the telescopic boom vertical bending suppression apparatus of FIG. It is a principal part arrow directional view of the XX cross section of FIG. It is a side view of the mobile crane equipped with the expansion-contraction boom vertical bending suppression apparatus which concerns on 4th Example of this invention. It is a telescopic boom back view of the telescopic boom vertical bending suppression apparatus of FIG. It is a principal part arrow directional view of the XX cross section of FIG. It is a side view of the mobile crane equipped with the conventional telescopic boom vertical bending suppression apparatus.

Explanation of symbols

A: Mobile crane,
1; vehicle,
2; swivel,
3; telescopic boom,
3a; tip (of telescopic boom),
3c; telescopic boom longitudinal axis,
4; Hydraulic cylinder for telescopic boom hoisting,
5; Jib,
6; Jib mounting frame,
7; Hydraulic cylinder for jib hoisting,
8; Suspension tool (suspended from the tip 3a of the telescopic boom 3),
9; a hanger (suspended from the tip of the jib 5),
10; guy rope,
11; Guy rope base end connecting means,
11a;
12; Guy rope length adjusting means,
13; arm means 14; rotating arm 15; hydraulic cylinder for arm rotation,
16; rotating shaft,
17; telescopic arm,
18; hydraulic cylinder for arm expansion and contraction,

Claims (5)

  A swivel base 2 mounted on the vehicle 1 so as to be capable of swivel driving, and a base end portion of the swivel base 2 is connected to be able to be swung up and down, and is driven to rise and fall by a telescopic boom hoisting hydraulic cylinder 4 interposed between the swivel base 2. The telescopic boom 3 and the jib 5 that is removably added to the telescopic boom 3 tip 3a so that the bending direction moment acting on the telescopic boom 3 gives a bending moment to the telescopic boom 3 tip 3a. A mobile crane telescopic boom vertical deflection suppression device comprising a changeable jib 5, which is attached to the distal end portion 3 a of the telescopic boom 3 and is capable of changing the amount of extension to the rear side of the telescopic boom 3. The guy rope 10 connected to the extension end of the arm means 13, the telescopic boom 3 in the longitudinal middle part or the swivel base 2, and the guy rope Guy rope base end connecting means 11 for connecting the base end of 0 at a position spaced from the telescopic boom longitudinal axis 3c to the back side of the telescopic boom 3, and the guy rope between the arm means 13 and the guy rope base end connecting means A telescopic boom vertical deflection suppressing device for a mobile crane, characterized by comprising a guy rope length adjusting means 12 for adjusting a tension length.   The arm means 13 has a pivot arm 14 whose base end is pivotally attached to the distal end 3a of the telescopic boom 3 so that the amount of extension of the arm means 13 to the rear side of the telescopic boom can be changed. 2. The telescopic boom vertical deflection suppressing device for a mobile crane according to claim 1, wherein the device is constituted by an arm rotating hydraulic cylinder for rotating the moving arm.   The arm means 13 is extended and retracted so that the extension amount to the back side of the telescopic boom 3 can be changed by extending and contracting, and the telescopic arm 17 standing at the base end of the telescopic boom and the arm extending and contracting the telescopic arm 17. 2. The telescopic boom vertical deflection suppressing device for a mobile crane according to claim 1, wherein the device is constituted by a hydraulic cylinder for use. A jib 5 is attached to a jib attachment frame 6 detachably attached to the distal end portion of the telescopic boom, via a jib raising / lowering hydraulic cylinder 3a, so that the raising / lowering can be driven, and an arm means 13 is attached to the jib attachment frame 6. The telescopic boom vertical deflection suppressing device for a mobile crane according to any one of claims 1 to 3, wherein the telescopic boom vertical deflection suppressing device is provided.     The arm means 13 disposed at the distal end portion 3a of the telescopic boom 3, the guy rope 10 having the distal end portion connected to the distal end portion 3a of the telescopic boom 3 via the arm means 13, the longitudinal middle portion of the telescopic boom 3 or the swivel base 2 Guy rope base end connecting means 11 for connecting the base end of the guy rope 10 at a position spaced apart from the telescopic boom longitudinal axis 3c on the back side of the telescopic boom 3, and a guy rope for adjusting the extension length of the guy rope 10 The telescopic boom vertical deflection restraining device C constituted by the length adjusting means 12 has a pair of left and right so that the extending path of the guy rope 10 passes through the left and right of the telescopic boom longitudinal axis 3c in the rear view of the telescopic boom 3. 5. The telescopic boom vertical deflection suppressing device for a mobile crane according to claim 1, wherein the device is equipped with the telescopic boom vertical deflection suppressing device.

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