WO2005054109A1

WO2005054109A1 - Mobile crane

Info

Publication number: WO2005054109A1
Application number: PCT/JP2004/018321
Authority: WO
Inventors: Masahumi Nakamura
Original assignee: Tadano Co., Ltd.
Priority date: 2003-12-02
Filing date: 2004-12-02
Publication date: 2005-06-16
Also published as: JP2005162392A

Abstract

A mobile crane (Z) having, with an extension jib (4) attached to the top of a telescopic boom (3), a device with which the maximum value of lifting loads can be increased by absorbing a part or the whole of longitudinal and lateral bending moment acting on the entire extension jib (4) and telescopic boom (3). More particularly, the mobile crane (Z) has, with the extension jib (4) attached to a telescopic boom top section (30), masts (36, 37) arranged on the extension jib (4), inclined relative to a boom elevation plane, and has tension members (39, 40) extended in the longitudinal direction of the extension jib (4), connected to the top sections of the masts, and of the telescopic boom (3). Inclinations of the masts (36, 37) are selected so that a part or the whole of longitudinal and lateral moment acting on the extension jib (4) and the telescopic boom (3) is absorbed.

Description

Mobile crane

TECHNICAL FIELD The present invention relates to an extension jib and an extension

The present invention relates to a mobile crane equipped with a device for absorbing part and all of the bending moment in the vertical and horizontal directions acting on the boom.

BACKGROUND ART A telescopic boom of a mobile crane is configured such that an intermediate boom is telescopically inserted into a base end boom and a distal end boom is telescopically inserted into the intermediate boom. During crane work of a mobile crane, the suspended load is suspended by the wire suspended from the tip of the end boom while the telescopic boom is extended, and the bending moment in the »direction along the undulating surface of the telescopic boom. Acts on the entire telescopic boom. For this reason, the maximum lifting load is often determined by the strength of the cross section of the telescopic boom against the vertical bending moment, except for the working posture, which is determined by the stability of the entire mobile train. Therefore, a mast is erected upward on the upper surface of the proximal boom, and the distal end of the mast and the distal end of the distal boom, and the distal end of the mast and the proximal end of the proximal boom are connected by a tension member. Then, the tension member absorbs the vertical bending moment acting on the telescopic boom during crane operation, and the device force S that further increases the maximum lifting load without increasing the strength of the telescopic boom has been proposed. (For example, Japanese Patent Application Laid-Open No. 57-184 9 2). (Hereinafter, this term will be referred to as “super lift”.) In the above super lift, the maximum value of the lifting load is determined by the strength of the vertical bending moment acting on the telescopic boom. Such a crane working posture, that is, the length of the telescopic boom is long and the undulation angle is relatively small, which is sometimes effective.In the state where the undulation angle of the telescopic boom approaches vertical, the telescopic boom may bend horizontally. There was a problem, and it could not be said that such a posture had a sufficient effect.

Therefore, the mast of the above-mentioned super lift is further inclined with respect to the up-and-down surface of the telescopic boom so that the bending moment acting on the telescopic boom is absorbed. A device force S has been proposed that also increases the maximum value of the lifting load in the state of approaching and vertical (for example, Japanese Patent Application Laid-Open No. 2001-58971). (Hereinafter, this device will be referred to as “sideways superlift (abbreviated as“ SS LJ. ”).) By attaching the above-mentioned SSL to the telescopic boom, the stability of the mobile crane as a whole can be improved. It is possible to increase the maximum value of the lifting load in almost all positions of the telescopic boom except for the determined area. Disclosure of the invention

Since mobile cranes are often used with a jib attached to the end of the telescopic boom, the maximum lifting load can be maintained without increasing the strength of the extended jib and telescopic boom even when performing such jib work. It is desired to increase the value.

However, the force S, the jib was attached to the telescopic boom equipped with the above-mentioned super lift or SSL, and the jib was mounted and the jib was performed ^ \ The vertical and vertical bending moments acting on the whole of the telescopic boom and the extended jib The strength was not enough. In view of the above, the present invention provides a method of absorbing a part or the whole of the bending moment in the vertical direction and acting on the entire extension jib and the extension boom in a state where the extension jib is attached to the tip of the extension boom. A mobile crane equipped with a device capable of increasing the maximum lifting load is intended to be used.

A mobile crane according to claim 1 of the present application includes a lower traveling structure, an upper revolving structure rotatably mounted on the lower traveling structure, and a telescopic boot pivotally mounted on the upper revolving structure so as to be able to undulate. In a mobile crane having a telescopic boom and a extending jib detachably attached to a distal end portion of the telescopic boom, a knitting a extension jib is mounted on the mobile crane with the telescopic boom distal end mounted with the extending jib. A mast oblique to the placed boom undulating surface, and a tension member connected to the mast tip and extending in the longitudinal direction of the extension jib and the telescopic boom. The inclination of the mast is selected so as to absorb part or all of the bending moments acting in the directions »and». In the mobile crane according to claim 2 of the present application, a pair of left and right masts is arranged at a selected location of the extension jib, and one of the masts is inclined rightward with respect to the undulating surface. The other mast is characterized by being # 1 on the left side with respect to the undulating surface.

In the mobile crane according to claim 3 of the present application, the Sift EII supplementary jib includes a jib support detachable from the distal end of the telescopic boom, and a jib body pivotally attached to the jib support so as to be able to undulate. The mast is characterized in that its base end is connected to the jib support.

The mobile crane described in claim 4 of the present application is characterized by comprising mast inclination angle changing means capable of changing the inclination angle of the self-mast with respect to the boom undulating surface. In the mobile crane described in claim 5 of the present application, the pair of left and right masts And a second mast located closer to the jib base end than the first mast, and the distal ends of the first mast and the second mast are connected by a mast tension member.

The mobile crane according to claim 6 of the present application is characterized in that the tirte addition jib is provided with a hydraulic cylinder having both ends pivotally mounted between the jib sabot and an appropriate position of the jib main body, and the tiff is expanded and contracted by the hydraulic cylinder. The function of raising and lowering the jib body relative to the jib support is a special feature.

A mobile crane according to a seventh aspect of the present invention is characterized in that the mobile crane is provided with a tension adjusting means for a knitting tension member.

The mobile crane according to claim 8, wherein the tension member includes a first tension member that connects a distal end portion of the jib body and a distal end portion of the mast, and a distal end portion of the mast and a proximal end of a boom. And a second tension member that communicates with the part, and that is composed of.

In the mobile crane according to claim 9 of the present application, the tension member is extended from a first tension member that connects a tip portion of the jib body and a tip portion of the mast, and a winch arranged on an upper revolving unit. And a second tension member by a wire that communicates with the tip of the tiiia mast.

The invention described in claim 1 of the present application is directed to a lower traveling body, an upper revolving body rotatably mounted on the lower traveling body, and a telescopic boom pivotally mounted on the upper revolving body so as to be able to undulate. A movable crane having: a resilient jib detachably attached to the distal end of the telescopic boom; And the tension 咅 extension that extends in the longitudinal direction of the jib and the telescopic boom absorbs the longitudinal and υ ^ ¾ · bending moments acting on the entire extension jib and the telescopic boom. Increasing the maximum lifting load at 1 jib without increasing the strength of the extension jib and the telescopic boom, because the inclination of the mast placed on the extension jib with respect to the boom surface is selected to accommodate Can be done.

According to the invention described in claim 2 of the present application, one mast arranged on the extension jib is inclined rightward with respect to the undulating surface, and the ito mast is inclined leftward with respect to the undulating surface J [ Tension the lateral bending moment in the left and right direction of the extension jib and telescopic boom! The age can be absorbed.

According to the invention described in claim 3 of the present application, the jib body can be raised and lowered on the jib support that can be attached to and detached from the end of the telescopic boom. The angle can be changed freely. Therefore, a wide range of jib working postures can be selected. In addition, since the base end of the mast is connected to a jib support that can be attached to and detached from the end of the telescopic boom, the position of the base end of the mast can be changed even if the angle of the jib body described on the jib support is changed. Change · 変化 τΤ, the appearance of the mast is convenient to Wei. According to the invention described in claim 4 of the present application, since the mast inclination angle changing means can change the inclination angle of the mast with respect to the boom undulation surface, the bending moment acting on the extension jib and the extension boom Of these, the absorption ratio of the component in the »direction and the horizontal direction can be adjusted to be.

According to the invention described in claim 5 of the present application, the pair of left and right masts includes a first mast and a second mast located closer to the jib base end side than the first mast, and the first mast and the second mast are provided. Since the ends of the strikes are connected by a tension member, the arm length for generating a moment can be secured even if the undulation angle of the extension jib to the expansion / contraction boom is large. Jiby will be possible for me. According to the invention described in claim 6 of the present application, the front ia right and left jib is provided with independent jib up and down driving means (tilt cylinder), and has a structure in which the telescopic boom and the extended jib are joined together. Therefore, the ratio of the bending moment absorbed by the tension attachment can be increased.

According to the invention described in claim 7 of the present application, since the tension adjusting means for the tension member is provided, the ratio of the bending moment absorbed by the tension member can be adjusted. According to the invention, the first tension member connects the distal end of the fli B jib body to the distal end of the mast, and the first tension member connects the distal end of the knitting mast to the proximal end of the proximal boom. Since the two tension members are separately provided, the tension can be adjusted independently by the first tension member and the second tension member.

According to the invention described in claim 9 of the present application, the tension member is disposed on the upper revolving superstructure, the first tension member connecting the tip of the jib main body and the tip of the disgusting mast. Since it is composed of a wire and a second tension member which is extended from the winch and communicates with the end of the mast, the wire constituting the second tension member is extended and retracted by the winch arranged on the upper rotating body. Thus, the undulation angle of the extension jib of the telescopic boom can be adjusted. In the figure:

FIG. 1 shows a mobile crane according to Embodiment 1;

Fig. 2 is a view as seen from the arrow C in Fig. 1;

Fig. 3 is the extension jib and telescopic boom part of the mobile crane according to the second embodiment; FIG. 4 is a detailed view of FIG.

FIG. 5 shows a mobile crane according to the third embodiment.

as well as

FIG. 6 is a modification of the first embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

In the present invention, a lower traveling body, an upper revolving body pivotally mounted on the lower traveling body, a telescopic boom pivotally mounted on the upper revolving body so as to be able to undulate, and a detachable and detachable tip of the telescopic boom. A mobile crane equipped with a rehabilitating jib, and a mast that is low-inclined with respect to a boom undulation surface disposed on the rehabilitating boom, with the rehabilitating boom attached to the tip of the extension boom. And a tension member extending in the longitudinal direction of the extension jib and the shrinking plum connected to the mast tip, and a longitudinal and 潢 -direction bending moment acting on the extension jib and the telescopic boom. It is the best mode for implementing the common practice that the inclination of the boom undulation surface of the mast is selected so as to absorb part or all of the mast.

(Example 1) ''

FIG. 1 shows the entirety of a mobile crane Z according to a first embodiment of the present invention. The mobile crane Z includes a lower traveling structure 1, an upper revolving structure 2 rotatably mounted on the lower traveling structure 1, a telescopic boom 3 pivotably mounted on the upper revolving structure 2, and And an extension jib 4 detachably attached to the distal end of the telescopic boom 3.

The extension jib 4 is composed of a jib support 31 that can be attached to and detached from the distal end portion 30 of the telescopic boom 3 and a jib body 32 that is pivotally attached to the jib sabot 31 so as to be able to undulate. The The main body 32 includes a base jib 33, a plurality of intermediate jibs 34, 34 connected to the base jib 33, and a distal jib 3 connected to the distal end of the middle jib 34. And 5. The overall length of the jib body 32 can be changed by increasing or decreasing the number of the intermediate jib 34.

36 is a first mast connected to the upper end of the jib support 31, and 37 is a second mast similarly connected to the upper end of the jib support. The second mast 37 is disposed so as to be located closer to the jib base end than the first mast 36. Both the first mast 36 and the second mast 37 are rotatable about the pivot point with the jib support 31 along the undulating surface of the jib body 32.

Reference numeral 38 denotes an inter-mast tension member that communicates the ends of the first mast 36 and the second mast 37. The tension member 38 between the masts is composed of a link or wire rope that can be bent. The triangle formed by the first mast 36, the second mast 37 and the tension between the masts 38 keeps a constant shape irrespective of the change in the undulation angle of the jib body 32 with respect to the jib support 31. Even when the angle of the jib body 32 with respect to the telescopic boom 3 is large, the arm length for generating the moment can be secured, and the jib ^ I can be obtained over a wide range of the jib.

Reference numeral 39 denotes a first tension member that connects the distal end of the distal jib 35 and the distal end of the first mast 36, and is configured by a wire rope, a continuous link, or the like. The length of the first tension member 39 can be changed according to the length of the jib body 32 described above.

Reference numeral 40 denotes a wire that is repeated from the first winch 41 disposed on the upper swing body 2 and communicates with the tip of the second mast 37. Applicable. The length of the second tension member 40 can be adjusted by operating the first winch 41 in accordance with the telescopic operation of the telescopic boom 3. Also, by changing the length of the second tension attachment 40 with the first winch 41 while the length of the telescopic boom 3 is constant, the angle of the jib body 32 with respect to the telescopic boom 3 is changed. be able to.

Reference numeral 43 denotes a lifting work unreeled from the second winch 42 of the upper swing body. The lifting wire 43 is suspended from the tip of the tip jib 35 via the guide sheave 44 of the second mast and the guide sheave 45 of the first mast, and is connected to the hook 46 for the load. .

FIG. 2 is a detailed view taken in the direction of arrow C in FIG. 1, showing the details of the second mast 37. FIG. Since the configuration of the first mast 36 is the same as that of the second mast 37, illustration and explanation are omitted.

As shown in FIG. 2, the second mast 37 is composed of a pair of left and right masts, one of which, the second mast 37 R on the right, is inclined α degrees to the right with respect to the undulating surface Y. , »The second mast 37 L on the left side is similarly inclined to the left with respect to the undulating surface Υ. Elements consisting of a pair of left and right attachments, such as the second mast 37 above, will be identified by adding R (right attached sound) and L (left member) to the numbers. .

The second mast 37R is connected to the jib support 31 via a swinging attachment 61R. The swing member 61R can tilt with respect to the undulating surface として about a tilt axis 60R that is に対して with respect to the telescopic boom 3. Further, the second mast 37R is rotatable with respect to the swing member 61R about a rotation axis 62R orthogonal to the ftff self-tilting axis 60R. With such a configuration, the second mast 37 R can select a low slope with respect to the undulating surface Y, The undulating operation along the undulating surface Y is possible.

6 3 R is a tilt hydraulic cylinder having both ends pivotally connected to the jib support 3 1 and the swinging member 6 1 R, and corresponds to the mast diagonal angle changing means described in the claims. . By extending and retracting the tilting hydraulic cylinder 63R, the tilt angle α of the rocking attachment 61R and the second mast 37R with respect to the undulating surface できる can be changed. Note that the inclination angle α can be set to 0 degrees, in which case the second masts 37 R and 37 L on the right of iife are ¥ 1 亍.

Thus, by selecting the inclination of the undulating surface Y of the first mast 36 and the second mast 37, the jib 4 and the expansion and contraction are performed by the first tension member 39 and the second tension member 4O. Part and all of the bending moments acting on the boom 3 in the directions can be absorbed.

FIG. 6 shows a mobile crane Z according to a modification of the first embodiment, in which the extension jib 4 has only the second mast 37 on the jib support 31. FIG. This type of extension jib is used only when the tilt angle of the jib body 32 with respect to the telescopic boom 3 is relatively small. The view from the arrow C in the figure is the same as that shown in FIG. In the extension jib 4 shown in FIG. 6, since the mast is only the second mast 37, there is an advantage that the overall structure is simpler than that of FIG.

(Example 2)

FIG. 3 shows a staying jib 11 and a telescopic boom 12 of a mobile crane according to a second embodiment of the present invention. The extension jib 11 is composed of a jib support 14 that can be attached to and detached from the distal end 13 of the telescopic boom 12 and a jib body 15 that is pivotally attached to the jib sabot 14 so as to be able to undulate. . The jib body 15 is inserted into the Si jib 16 and the base jib 16 concerned. And a tip jib 18 fitted into the middle jib 17. The jib body 15 is provided with a telescopic mechanism S (not shown) inside, and the jib body 15 is driven to expand and contract by the telescopic mechanism.

The extension jib 11 is provided with a tilt cylinder 19 pivotally connected at both ends to a lower portion of the jib support 14 and a lower portion of the base jib 16. The jib body 15 is driven up and down with respect to the jib support 14. The chinoleto cylinder 19 is of a double-acting type, and its extension; ft} and the oil passage leading to both oil chambers, so that hydraulic oil can be held in the oil chamber and closed. A pie mouth check valve is interposed. Thus, the undulation angle of the jib body 15 with respect to the jib support 14 (the telescopic boom 12) can be mechanically fixed.

Reference numeral 20 denotes a first mast connected to the upper end of the jib support 14, and reference numeral 21 denotes a second mast similarly connected to the upper end of the jib support. The first mast 20 is disposed so as to be located closer to the jib tip than the second mast 21. Both the first mast 20 and the second mast 21 are rotatable about the point of attachment to the jib support 14 along the undulating surface of the jib body 15.

Reference numeral 22 denotes an inter-mast tension member that connects the ends of the first mast 20 and the second mast 21 to each other. The inter-mast tension member 22 is formed of a bendable link or a wire rope. The triangle formed by the first mast 20, the second mast 21, and the tension between the masts (Appendix 22) has a constant shape regardless of the change in the undulation angle of the jib body 15 with respect to the jib support 14. Therefore, even if the elevation angle of the jib body 15 with respect to the telescopic boom 1 2 becomes large, a length of ^ B for generating a moment can be secured, so that the jib condition can be formed over a wide range of elevation angles. Reference numeral 23 denotes a first tension member that connects the distal end of the distal jib 18 and the distal end of the first mast 20 and is formed of a wire rope. Reference numeral 24 denotes a pinch which constitutes the first tension adjusting means attached to the first mast 20, and the wire rope 23 of the tension member is wound around the first mast tip shib 25 to be wound. Can be extended. Therefore, the length of the first tension member 23 can be adjusted by operating the winch 24 in accordance with the extension / contraction operation of the jib body 15.

Reference numeral 27 denotes a second tension member connecting the proximal end of the proximal end boom 26 and the distal end of the second mast 21 and is constituted by a wire rope. Reference numeral 28 denotes a winch, which constitutes second tension adjusting means attached to the second mast 21, and the wire rope 27 attached to the second tension 咅 is wound around the second mast tip chip 29. It can be rolled out and extended. Therefore, the length of the second tension sound attachment 27 can be adjusted by operating the winch 28 in accordance with the extension / contraction operation of the extension / contraction boom 12. Also, when changing the undulation angle of the jib body 15 with respect to the telescopic boom 12 with the chinoleto cylinder 19, the length of the second tension 咅 27 is adjusted by operating the winch 28. be able to.

Further, the first tension adjusting means 24 and the second tension adjusting means 28 adjust the initial tension of the first tension member 23 and the second tension member 27 when the jib is lowered, thereby providing a tension member. The ratio of the bending moment absorbed by the steel can be adjusted.

5 is not shown! / A lifting work wire pulled out from the winch of the upper swing body. The lifting work wire 5 passes through the guide sheave 6 of the second mast 21 and the guide sheave 7 of the first mast 20, is hung from the tip of the tip jib 18, is connected to the lifting load hook 8, and is connected to the rail. The

FIG. 4 is a detailed view taken in the direction of arrow B in FIG. 3, and shows details of the second mast 21. Since the configuration of the first mast 20 is the same as that of the second mast 21, illustration and description are omitted.

As shown in FIG. 4, the second mast 21 is composed of a pair of left and right masts, one of which has a right second mast 21 R on the right side of the undulating surface Y at an angle of α degrees. The second mast 21 L on the left side of ftil ^ is similarly inclined leftward by α degrees with respect to the undulating surface Y.

The second mast 21 R is connected to the jib support 14 via a swinging attachment 51 R. The oscillating member 51 R can tilt with respect to the undulating surface とし about a tilt axis 50 R parallel to the telescopic boom 12. Further, the second mast 21R is rotatable around a rotation axis 52R orthogonal to the tilt axis 50R with respect to the swinging motion 51R. With such a configuration, the second mast 21R can select a slope along the undulating surface Υ, and can perform an undulating operation along the undulating surface R.

5 3 R is a tilting oil cylinder having both ends pivotally attached to the jib support 14 and the swinging member 51 R, which corresponds to the mast angle-inclination changing means described in the claims. You. By extending and retracting the tilt hydraulic cylinder 53R, the angle of inclination of the tilting hydraulic cylinder 51R and the undulating surface R of the second mast 21R can be changed. Note that the inclination angle can be set to 0 degrees, in which case the second masts 21 R and 21 L on the right of fife are as follows.

In this way, by selecting and measuring a low slope on the undulating surface Y of the first mast 20 and the second mast 21, the first and second tension members 23 and 27 are added. Some of the bending moments acting on the jib 11 and the telescopic boom 12 All can be absorbed.

(Example 3)

FIG. 5 shows a third embodiment in which the telescopic boom 3 of the mobile crane Z according to the present invention described in the first embodiment is provided with a super lift 70. The description of the parts common to the first embodiment will be omitted.

The super lift 70 includes a mast 72 erected at the top of the distal end of the base boom 71, an upper tension attachment 73 for connecting the mast distal end and the telescopic boom distal end 30, It comprises a lower tension member 74 which connects the distal end portion and the Si 耑 portion of the proximal end boom 71.

The superlift 70 absorbs a part or all of the vertical bending moment acting on the telescopic boom 3, so that the maximum value of the lifting load during the jib condition by the mobile crane of the present invention can be further increased. it can.

Of course, the above super lift 70 may be replaced by SSL, in which case it acts on the telescopic boom. The maximum value of the lifting load at the time of the jib work can be further increased.

Claims

The scope of the claims

1.A lower traveling structure, an upper revolving structure pivotally mounted on the lower traveling structure, a telescopic boom pivotally mounted on the upper revolving structure so as to be able to move up and down, and a detachable and detachable tip of the telescopic boom. In a mobile crane provided with an extension jib, a mast inclined with respect to a boom undulating surface arranged on the extension jib, with the extension jib attached to the telescopic boom tip end; A tension member extending in the longitudinal direction of the extension jib and the telescopic boom, which is connected to the mast tip, and comprising a longitudinal and a gentle bending moment acting on the extension jib and the extension boom. Mobile crane characterized in that the slope of the S-mast is selected so as to absorb part or all.

2. A pair of left and right masts are located at the selected location of the extension jib, one of which is inclined to the right with respect to the undulating surface, and the other mast is inclined to the left with respect to the undulating surface. The mobile crane according to claim 1, wherein the mobile crane is inclined.

3. The extension jib comprises: a jib support detachably attached to the distal end of the telescopic boom; and a jib body pivotally attached to the jib support so as to be able to undulate. 3. The mobile crane according to claim 2, wherein the mobile crane is connected to the mobile crane.

4. The mobile crane according to claim 3, further comprising mast inclination angle changing means capable of changing an inclination angle of the mast with respect to a boom surface.

5. The pair of left and right masts includes a first mast and a second mast located closer to the jib base end than the first mast. 4. The movement according to claim 3, wherein the contact is made by a tension member. Type crane.

6.The extension jib is provided with a tilt cylinder with both ends pivotally mounted between the jib sabot and the jib body at appropriate positions, and the jib body is driven up and down relative to the jib support by expansion and contraction of the tilt cylinder. The mobile crane according to claim 3, wherein:

7. The mobile crane according to claim 6, further comprising a tension adjusting means for the tension member.

8.The tension member includes: a first tension member that connects a distal end of the jib body and a distal end of a mast; a second tension member that communicates a distal end of the mast and a proximal end of a proximal boom; 7. The mobile crane according to claim 6, wherein the mobile crane is configured.

9.The tension member is a first tension member that connects the tip end of the jib body and the tip end of the mast, and a wire that is fed from a winch disposed on the upper rotating body and connects the tip end of the mast. 4. The mobile crane according to claim 3, wherein the mobile crane is constituted by: a second tension member formed by: