CN210001478U - Arm frame assembly and crane - Google Patents
Arm frame assembly and crane Download PDFInfo
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- CN210001478U CN210001478U CN201920902947.XU CN201920902947U CN210001478U CN 210001478 U CN210001478 U CN 210001478U CN 201920902947 U CN201920902947 U CN 201920902947U CN 210001478 U CN210001478 U CN 210001478U
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- arm
- waist rope
- arm support
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- pulling plate
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Abstract
The application relates to the technical field of engineering machinery, in particular to jib assemblies and a crane, which comprise a jib, a pull plate and a waist rope, wherein the jib is provided with a jib head used for being far away from a rotary table of the crane, the end of the pull plate is connected to the jib head, the waist rope is obliquely arranged relative to the jib, the waist rope is provided with a connecting end connected to the pull plate and a second connecting end connected to the jib, and the second connecting end is positioned between the connecting end and the jib head in the length direction of the jib.
Description
Technical Field
The application relates to the technical field of engineering machinery, in particular to arm support assemblies and a crane.
Background
At present, arm supports adopted by cranes are longer and longer, deflection of downward bending is generated on the arm supports due to bending moment of gravity on the arm supports in the arm lifting process, the longer the arm supports are, the larger the bending moment is, the danger to the arm supports is increased, if devices such as waist ropes are not used for effectively overcoming the bending moment generated by the gravity to protect the arm supports, the arm lifting capacity of the cranes is limited due to safety considerations, as shown in fig. 5, the existing waist rope devices are basically vertical to the arm supports and mainly have the effects that the deflection of the middle parts of the arm supports is reduced through upward tensile force of the waist ropes on the arm supports, so that the arm supports are protected, the arm lifting capacity is improved, however, in the aspect of , tensile force of pull plates can generate bending moment on the arm supports at arm heads of the arm supports, the bending moment can generate on the arm supports in the length direction perpendicular to the arm supports, the tensile force of the pull plates at the arm heads of the arm supports can be increased, the arm supports are -increased, particularly, the bending moment of the arm heads of the arm supports is reduced, and the arm lifting capacity of the arm can not be limited easily.
SUMMERY OF THE UTILITY MODEL
The application aims to provide jib assemblies and a crane, which not only keep the effect of a waist rope on vertical upward lifting of a jib, but also reduce the pulling force of a pulling plate on the jib head to prevent the jib from buckling, thereby improving the jib lifting capacity.
In order to achieve the purpose, the following technical scheme is adopted in the application:
aspects of the application provide arm support assemblies comprising an arm support, a pulling plate and a waist rope,
the arm support is provided with an arm head used for being arranged far away from a rotary table of the crane, the end of the pulling plate is connected with the arm head,
the waist rope is obliquely arranged relative to the arm support and is provided with an th connecting end connected to the pulling plate and a second connecting end connected to the arm support, and the second connecting end is located between the th connecting end and the arm head in the length direction of the arm support.
Preferably, the arm support has a mounting end for mounting on the turntable, and the waist rope is located between the mounting end and the arm head and closer to the arm head in the length direction of the arm support.
The technical scheme has the beneficial effects that: because several sections of arm frames of the arm head part are usually lighter in weight and weaker in structural strength, and the buckling instability of the several sections of arm frames is easily caused by the tensile force of the pulling plate to the arm head and the bending moment of the arm frames caused by the gravity, the pulling plate tensile force can be reduced on the premise that the waist rope is ensured to reduce the deflection of the arm frames when the waist rope is positioned at the position closer to the arm head, so that the buckling instability of the several sections of arm frames of the arm head part can be effectively avoided.
Preferably, an included angle is formed between the length direction of the waist rope and the th direction, the included angle is greater than or equal to 10 degrees and less than or equal to 85 degrees, and the th direction is perpendicular to the length direction of the arm support.
The technical scheme has the beneficial effects that: the arm support can reduce the pulling force of the pulling plate on the arm head to prevent the arm support from buckling, so that the inclination angle of the waist rope relative to the arm support can be changed within a reasonable range, and better arm lifting capacity is obtained.
Preferably, the included angle is 67 degrees.
The technical scheme has the beneficial effects that: therefore, the position relation between the waist rope and the arm support can be adopted by various length specifications of the arm support, and the arm support can have better arm lifting capacity.
Preferably, the waist rope is hinged to the arm support, and the waist rope is hinged to the pulling plate.
The technical scheme has the beneficial effects that: in the arm lifting process, because the included angle between the length direction of the arm support and the gravity direction is changed, the angle between the deflection caused by gravity and the length direction of the arm support is changed, the deflection deformation of the arm support is correspondingly changed, so that the angles of the waist rope, the arm support and the pull plate can be changed, when the waist rope is hinged with the arm support and the waist rope is hinged with the pull plate, no additional internal stress can be generated, and the rigid connection can generate additional internal stress.
Preferably, the hinge is a pin connection.
The technical scheme has the beneficial effects that the waist rope, the arm support and the pulling plate are conveniently mounted to , and of course, other hinging modes can be adopted besides the mode of adopting the pin shaft connection.
Preferably, the waist rope is a steel wire rope, a chain or a pulling plate.
The technical scheme has the beneficial effects that the waist rope with a proper form can be selected according to the specific application environment, and the arm raising capability is further improved by steps.
Preferably, the waist rope is made of a metal material or a composite material.
The technical scheme has the beneficial effects that: the material of the waist rope can be selected according to the working condition so as to select the waist rope with proper weight and strength.
Preferably, the arm support comprises a main arm, and the length of the main arm is greater than or equal to 80 meters.
The technical scheme has the beneficial effects that: this makes the arm frame subassembly that this application embodiment provided can mainly be applied to long arm or overlength arm operating mode.
Another aspect of the present application provides a crane that includes the jib assembly described above.
The technical scheme provided by the application can achieve the following beneficial effects:
the arm support assembly provided by the embodiment of the application can obviously improve the arm lifting capability of a long arm, particularly an ultra-long arm, so that the arm lifting of a longer arm which cannot be realized by a waist rope basically vertical to an arm support can be realized. In a long arm or an ultra-long arm frame, when the structural strength of the arm frame at the root part is stronger and the weight is heavier, and the structural strength of the arm frame at the arm head is weaker and the weight is lighter, compared with the traditional waist rope basically vertical to the arm frame, the arm frame assembly provided by the embodiment of the application can obviously improve the arm lifting capability of the long arm frame under the condition, and can avoid the occurrence of the dangerous situation of the reversely bent lifted arm frame.
Additional features of the present application and advantages thereof will be set forth in the description which follows, or may be learned by practice of the present application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below, it is obvious that the drawings in the following description are embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts.
FIG. 1 is a schematic structural diagram of embodiments of a crane provided in an embodiment of the present application;
figure 2 is a partial schematic structural view of embodiments of boom assemblies provided by embodiments of the present application,
wherein α is an included angle formed between the length direction of the waist rope 5 and the direction;
figure 3 is a partial schematic structural view of embodiments of boom assemblies provided by embodiments of the present application,
wherein F1 ' is the pulling force of the pulling plate on the arm head, F2 ' is the pulling force of the pulling plate acting on the main variable amplitude mast, and F3 ' is the pulling force of the waist rope;
figure 4 is a partial schematic structural view of embodiments of boom assemblies provided by embodiments of the present application,
wherein M1' is the bending moment of the arm support caused by the pulling force of the pulling plate on the arm head, and G is gravity;
figure 5 is a partial schematic view of a prior art boom assembly,
wherein F1 is the pulling force of the pulling plate on the arm head, F2 is the pulling force of the pulling plate acting on the main luffing mast, and F3 is the pulling force of the waist rope;
FIG. 6 is a schematic view of the force analysis at the connecting point of the waist rope and the pulling plate in FIG. 5;
fig. 7 is a schematic view of the force analysis at the connecting point of the waist rope and the pulling plate in fig. 3.
Reference numerals:
1-a turntable; 2-mounting end; 3-arm support; 4-pulling the plate; 5-waist rope; 6-arm head.
Detailed Description
The technical solutions of the present application will be described more fully and clearly with reference to the accompanying drawings, and it should be understood that the embodiments described are some, but not all, of the embodiments .
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application.
In the description of the present application, it is noted that unless otherwise expressly stated or limited, the terms "mounted," "connected," and "connected" are intended to be used to mean, for example, either fixedly or removably connected, or physically connected, mechanically or electrically connected, directly or indirectly connected through an intervening medium, or communicating between two elements.
As shown in fig. 1-4, the aspects of the present application provide boom assemblies comprising a boom 3, a pulling plate 4 and a waist rope 5,
the arm support 3 has an arm head 6 for positioning away from the turntable 1 of the crane, the end of the pulling plate 4 being connected to the arm head 6,
the waist rope 5 is obliquely arranged relative to the arm support, the waist rope 5 is provided with a th connecting end connected to the pulling plate 4 and a second connecting end connected to the arm support 3, and the second connecting end is positioned between the th connecting end and the arm head 6 in the length direction of the arm support 3.
Fig. 5 and 6 are stress analysis diagrams of the conventional jib assembly with the connection point of the waist rope and the pulling plate as a research object, wherein the pulling force of the pulling plate on the jib head is F1, the pulling force of the pulling plate acting on the main luffing mast is F2, and the pulling force of the waist rope is F3, wherein the main luffing mast is mounted on the turntable 1.
Fig. 3 and 7 are stress analysis diagrams of the boom assembly provided by the embodiment of the application, in which the connection point of the waist rope 5 and the pulling plate 4 is taken as a study object, where the pulling force of the pulling plate 4 on the boom head 6 is F1 ', the pulling force of the pulling plate 4 acting on the main luffing mast is F2 ', and the pulling force of the waist rope 5 is F3 '.
When the arm is raised, the situation shown in fig. 3, 5, 6 and 7 can be considered as being balanced at the connecting point of the waist rope 5 and the pulling plate 4. When the pulling force of the pulling plate 4 on the turntable 1 is kept constant, the pulling force of the pulling plate 4 on the arm head 6 changes along with the change of the length direction of the waist rope 5, and when the arm frame assembly provided by the embodiment of the application is adopted, the pulling force F1 'of the pulling plate 4 on the arm head 6 is smaller than F1, so that the bending moment M1' of the arm frame 3 caused by the pulling force of the pulling plate 4 on the arm head 6 is correspondingly reduced as shown in FIG. 4.
The arm support assembly provided by the embodiment of the application can obviously improve the arm lifting capability of a long arm, particularly an ultra-long arm, so that the arm lifting of a longer arm which cannot be realized by the waist rope 5 basically vertical to the arm support 3 can be realized. In the long arm or the ultra-long arm frame 3, when the structural strength of the arm frame 3 at the root part is stronger and the weight is heavier, and the structural strength of the arm frame 3 at the arm head 6 is weaker and the weight is lighter, compared with the traditional waist rope 5 basically perpendicular to the arm frame 3, the arm frame assembly provided by the embodiment of the application can obviously improve the arm lifting capability of the long arm frame 3 under the condition, and can avoid the occurrence of the dangerous situation of the reversely bent lifted arm frame 3. Through finite element analysis, the part mainly aims at that the crane adopting the technology related in the application changes the waist rope 5 from the traditional waist rope 5 basically vertical to the arm support 3 into the oblique waist rope 5 under the working condition of 120M main arm + 15M fixed auxiliary arm, and the oblique waist rope 5 with the proper length is selected to reduce the tensile force of the arm head 6 pulling plate 4, namely F1 'can be reduced by more than 15% compared with F1, and the bending moment M1' borne by the arm support 3 close to the arm head 6 part is also obviously reduced. The buckling safety factor of the arm support 3 is improved to be more than 1.5, so that arm lifting can be realized, and the buckling safety factor of the part, close to the arm head, of the arm support 3 is lower than 1.5 due to the use of the traditional waist rope 5 basically perpendicular to the arm support 3, so that arm lifting of a main arm with the length of 120 m and an auxiliary arm with the length of 15 m cannot be realized, and arm lifting can be realized only by reducing the length of the main arm or the auxiliary arm. Meanwhile, the same as the traditional waist rope 5 basically vertical to the arm support 3, the arrangement of the oblique waist rope 5 can also avoid the danger of the reversely bent arm support 3 under the condition of hoisting the arm support 3.
Preferably, the arm support 3 has a mounting end 2 for mounting to the turntable 1, and the waist rope 5 is located between the mounting end and the arm head 6 and closer to the arm head 6 in the length direction of the arm support 3. Because the arm frames 3 of the arm head 6 part are usually lighter in weight and weaker in structural strength, and the bending instability of the arm frames 3 is easily caused by the tensile force of the pull plate 4 to the arm head 6 and the bending moment of the arm frame 3 by gravity, the pull plate 4 is reduced by positioning the waist rope 5 at a position closer to the arm head 6 on the premise of ensuring that the waist rope 5 reduces the deflection of the arm frame 3, and the buckling instability of the arm frames 3 of the arm head 6 part is effectively avoided.
Preferably, as shown in fig. 2, an included angle α is formed between the length direction of the waist rope 5 and the th direction, the included angle α is greater than or equal to 10 degrees and less than or equal to 85 degrees, and the th direction is perpendicular to the length direction of the arm support 3, so that the inclination angle of the waist rope 5 relative to the arm support 3 can be changed within a reasonable range on the premise that the tensile force of the pulling plate 4 on the arm head 6 is reduced to prevent the arm support 3 from buckling, and further, a better arm lifting capability is obtained.
Preferably, the included angle is 67 degrees. Therefore, the position relation between the waist rope 5 and the arm support 3 can be adopted by various length specifications of the arm support 3, and the arm lifting capacity can be better.
Preferably, the waist rope 5 is hinged with the arm support 3, and the waist rope 5 is hinged with the pulling plate 4. In the arm lifting process, because the included angle between the length direction of the arm support 3 and the gravity direction is changed, the angle between the deflection caused by gravity and the length direction of the arm support 3 is changed, the deflection deformation of the arm support is correspondingly changed, so that the angles of the waist rope 5, the arm support 3 and the pull plate 4 are changed, when the waist rope 5 is hinged with the arm support 3 and the waist rope 5 is hinged with the pull plate 4, no additional internal stress is generated, and the rigid connection generates additional internal stress.
Preferably, the articulation is a pin connection, which facilitates mounting the waist cord 5 with the arm 3 and the pull plate 4, although other articulation means may be used instead of a pin connection.
Preferably, the waist rope 5 is a steel wire rope, chain or pulling plate 4. thus, the waist rope 5 can be selected in a proper form according to the specific application environment, and the arm raising capability is further improved .
Preferably, the waist rope 5 is made of a metal material or a composite material. The material of the waist rope 5 can be selected according to the working conditions to select the waist rope 5 with proper weight and strength.
Preferably, the arm support 3 comprises a main arm, and the length of the main arm is greater than or equal to 80 meters. Specifically, aiming at different working conditions, when the main arm is used independently or a combination of the main arm and the fixed auxiliary arm or the main arm and the arm frame of the variable-amplitude auxiliary arm is adopted, the length of each main arm is more than or equal to 80 meters. This makes the arm frame subassembly that this application embodiment provided can mainly be applied to long arm or overlength arm operating mode.
Another aspects of the present application provide a crane that includes the jib assembly provided in embodiments of the present application described above.
According to the crane provided by the embodiment of the application, by adopting the arm support assembly provided by the embodiment of the application, the arm lifting capacity can be obviously improved for long arms, particularly ultra-long arms, so that the arm lifting of the longer arms which cannot be realized by the waist rope 5 basically vertical to the arm support 3 can be realized. In the long arm or the ultra-long arm frame 3, when the structural strength of the arm frame 3 at the root part is stronger and the weight is heavier, and the structural strength of the arm frame 3 at the arm head 6 is weaker and the weight is lighter, compared with the traditional waist rope 5 basically perpendicular to the arm frame 3, the crane provided by the embodiment of the application can obviously improve the arm lifting capability of the long arm frame 3 under the condition, and can avoid the occurrence of the dangerous situation that the hoisted arm frame 3 is bent reversely.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Additionally, those skilled in the art will appreciate that while the embodiments described above include some features included in other embodiments, but not other features, the combination of features of different embodiments is meant to be within the scope of the application and form different embodiments.
Claims (10)
1. An arm frame assembly, comprising: a cantilever crane (3), a pulling plate (4) and a waist rope (5),
the arm support (3) is provided with an arm head (6) which is arranged far away from the rotary table (1) of the crane, the end of the pulling plate (4) is connected with the arm head (6),
the waist rope (5) is obliquely arranged relative to the arm support, the waist rope (5) is provided with a th connecting end connected to the pulling plate (4) and a second connecting end connected to the arm support (3), and the second connecting end is positioned between the th connecting end and the arm head (6) in the length direction of the arm support (3).
2. The boom assembly according to claim 1, characterized in that the boom (3) has a mounting end (2) for mounting to the turret (1), the waist rope (5) being located between the mounting end and the arm head (6) and closer to the arm head (6) in the length direction of the boom (3).
3. The arm support assembly of claim 1, wherein an included angle is formed between the length direction of the waist rope (5) and the th direction, the included angle is greater than or equal to 10 degrees and less than or equal to 85 degrees, and the th direction is perpendicular to the length direction of the arm support (3).
4. The boom assembly of claim 3, wherein the included angle is 67 degrees.
5. The boom assembly of claim 1, characterized in that the waist rope (5) is hinged with the boom (3) and the waist rope (5) is hinged with the pull plate (4).
6. The boom assembly of claim 5, wherein the hinge is a pin connection.
7. An arm support assembly according to claim 1, characterized in that the waist rope (5) is a wire rope, a chain or a pulling plate (4).
8. The arm support assembly according to claim 1, wherein the waist rope (5) is made of a metal material or a composite material.
9. The boom assembly of any of , according to any of claims 1-8, wherein the boom (3) comprises a main arm, the length of which is equal to or greater than 80 meters.
10. A crane comprising a boom assembly of any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920902947.XU CN210001478U (en) | 2019-06-14 | 2019-06-14 | Arm frame assembly and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920902947.XU CN210001478U (en) | 2019-06-14 | 2019-06-14 | Arm frame assembly and crane |
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| Publication Number | Publication Date |
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| CN210001478U true CN210001478U (en) | 2020-01-31 |
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| CN201920902947.XU Active CN210001478U (en) | 2019-06-14 | 2019-06-14 | Arm frame assembly and crane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110127540A (en) * | 2019-06-14 | 2019-08-16 | 浙江三一装备有限公司 | Arm support component and crane |
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2019
- 2019-06-14 CN CN201920902947.XU patent/CN210001478U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110127540A (en) * | 2019-06-14 | 2019-08-16 | 浙江三一装备有限公司 | Arm support component and crane |
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