CN105060140B - Auxiliary, crane arm and the crane of crane - Google Patents
Auxiliary, crane arm and the crane of crane Download PDFInfo
- Publication number
- CN105060140B CN105060140B CN201510510359.8A CN201510510359A CN105060140B CN 105060140 B CN105060140 B CN 105060140B CN 201510510359 A CN201510510359 A CN 201510510359A CN 105060140 B CN105060140 B CN 105060140B
- Authority
- CN
- China
- Prior art keywords
- cylinder
- jib
- auxiliary
- oil cylinder
- hinged
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000012530 fluid Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 121
- 230000007246 mechanism Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 12
- 238000007789 sealing Methods 0.000 description 9
- 238000003466 welding Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/68—Jibs foldable or otherwise adjustable in configuration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C2700/00—Cranes
- B66C2700/03—Cranes with arms or jibs; Multiple cranes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Actuator (AREA)
- Jib Cranes (AREA)
Abstract
The invention discloses a kind of auxiliary of crane, crane arm and crane.Auxiliary includes rotating arm part and for driving rotating arm part to rotate so that the auxiliary amplitude oil cylinder of auxiliary luffing, auxiliary amplitude oil cylinder have rodless cavity and rod chamber, it is characterised in that auxiliary amplitude oil cylinder is maintained at the working chamber of operating position using rodless cavity as supporting rotary arm portion.According to the present invention, when the rotating arm part of its auxiliary amplitude oil cylinder support auxiliary is maintained at operating position, big chamber is as working chamber, cylinder rod is in pressured state, so that when the auxiliary amplitude oil cylinder of the auxiliary is let out in generation also because pressure direction caused by fluid and outer load force suffered by cylinder rod it is in opposite direction the position of cylinder rod can be maintained to be basically unchanged, so as to maintain the position of the rotating arm part of auxiliary to be basically unchanged, the situation that auxiliary amplitude oil cylinder supports failure to the rotating arm part of auxiliary will not occur, so as to solve the problems, such as that scuffing of cylinder bore variable-amplitude auxiliary arm produces potential safety hazard because being let out in auxiliary amplitude oil cylinder in the prior art.
Description
Technical Field
The invention relates to the field of hoisting machinery, in particular to an auxiliary arm, a cargo boom and a crane of the crane.
Background
In order to increase the hoisting height of the crane, the boom of the crane usually comprises a main boom and a secondary boom arranged on the head of the main boom or the lengthened arm joint of the main boom to increase the length of the boom. The main arm realizes angle change and arm stretching and retracting actions through turntable support and oil cylinder amplitude change and stretching so as to lift a heavy object. The fixed auxiliary jib is a non-working amplitude-varying mechanism installed on the main jib of the crane, and the amplitude angle is changed in no-load to adjust the position of a lifting hook or other lifting appliances, while the amplitude angle is not changed in the process of lifting and moving a heavy object, so that the effect of increasing the total jib length and the operation amplitude is achieved.
The pulling plate amplitude-changing mechanism is one amplitude-changing mechanism for fixing the auxiliary jib, and is a mechanical amplitude-changing mechanism for setting several initial angles of the auxiliary jib by manually changing the length of the pulling plate. The mechanical luffing mechanism has the advantages of low cost and the disadvantages of complex operation, large manpower load and inapplicability to large cranes. With the continuous optimization and innovation of the structural design of the crane, the luffing mechanism for fixing the auxiliary jib is developed into an oil cylinder stepless luffing mechanism from an early pulling plate luffing mechanism.
The oil cylinder stepless amplitude changing mechanism adopts the oil cylinder as a prime mover to realize automatic amplitude changing of the auxiliary boom. The oil cylinder stepless amplitude changing mechanism can accelerate the operation progress and realize the continuous amplitude changing capability, not only can improve the amplitude changing speed of the fixed auxiliary arm, but also saves the arm falling operation which needs to be carried out when the pulling plate amplitude changing mechanism is adopted for changing the angle, thereby reducing the frequency of the lifting arm of the crane, and being beneficial to improving the service life and the working efficiency of a crane arm.
In the prior art, the oil cylinder stepless amplitude-changing mechanism of the auxiliary jib of the large-tonnage crane all uses a tensile oil cylinder to change the amplitude of the auxiliary jib, and the auxiliary jib is called as a cylinder-pulling amplitude-changing auxiliary jib hereinafter.
Fig. 1 is a partial structural schematic diagram of a cylinder-pulling amplitude-variable sub-boom in the prior art, wherein a sub-boom amplitude-variable oil cylinder is in a fully retracted state. Fig. 2 is a partial structural schematic diagram of the telescopic jib luffing cylinder of the telescopic luffing jib shown in fig. 1, wherein the telescopic jib luffing cylinder is in a fully retracted state.
As shown in fig. 1 and fig. 2, the cylinder-pulling luffing jib comprises a connecting frame assembly 1 ', a jib luffing cylinder 2', a rotating frame assembly 3 'and a jib joint assembly 4'. Wherein the link assembly 1' is typically mounted to the head of a main arm or an elongated knuckle of a main arm. The hanging lug at the bottom of the cylinder barrel of the auxiliary arm amplitude-variable oil cylinder 2 ' is hinged with the upper hinged part of the connecting frame assembly 1 ', and the hanging lug of the cylinder rod is hinged with the upper hinged part of the rotating frame assembly 3 '. The lower hinge part of the rotating frame assembly 3 is hinged with the lower hinge part of the connecting frame assembly 1'. An auxiliary arm joint assembly 4 is one of arm length forms of the working state of the auxiliary arm and is arranged at the front end of the rotating frame assembly 3'. The wire rope 5 'pulley support assembly 6' in fig. 1 and 2 is a component part for lifting operation.
When the amplitude-variable auxiliary boom of the pull cylinder is subjected to amplitude-variable operation, the extension and retraction of the amplitude-variable oil cylinder 2 ' of the auxiliary boom are controlled to enable the rotating frame assembly 3 ' to rotate around the connecting frame assembly 1 ', and after the target angle is reached, the amplitude-variable oil cylinder 2 ' of the auxiliary boom stops moving and locks the amplitude-variable oil cylinder 2 ' of the auxiliary boom, so that the purpose of automatically adjusting the included angle between the amplitude-variable auxiliary boom of the pull cylinder and the main boom is achieved.
In the condition that the sub jib amplitude variation oil cylinder 2' of the cylinder pulling amplitude variation sub jib shown in figure 1 is in a fully retracted state, the included angle between the cylinder pulling amplitude variation sub jib and the main jib is 0 degree. When the cylinder rod of the sub jib amplitude variation oil cylinder 2 'shown in fig. 2 is fully extended, the rotating frame assembly 3' rotates to the maximum angle relative to the connecting frame assembly 1, and the included angle between the pulling cylinder amplitude variation sub jib and the main jib is the maximum at the moment. The angle between the cylinder-pulling amplitude-variable auxiliary boom and the main boom can be adjusted when the length of the cylinder rod of the auxiliary boom amplitude-variable oil cylinder 2' is changed between the fully retracted state and the fully extended state, so that the stepless amplitude variation of the cylinder-pulling amplitude-variable auxiliary boom is realized.
The cylinder-pulling amplitude-variable auxiliary arm fully utilizes the characteristic of good tensile property of the cylinder rod. However, in the process of realizing the invention, the inventor finds that the auxiliary jib variable-amplitude oil cylinder 2' of the cylinder-pulling variable-amplitude auxiliary jib has greater potential safety hazard when internal leakage occurs due to sealing failure.
In the cylinder-pulling amplitude-variable auxiliary arm, a rod cavity (small cavity) of an auxiliary arm amplitude-variable oil cylinder 2' is used as a working cavity for supporting a rotating arm part of the cylinder-pulling amplitude-variable auxiliary arm to be kept at a working position. Once the auxiliary arm amplitude-variable oil cylinder 2 'leaks internally due to sealing failure, oil in the small cavity flows to the rodless cavity (the large cavity) to cause the cylinder rod to stretch out, the auxiliary arm amplitude-variable oil cylinder 2' cannot continuously provide pulling force, the support of the rotating arm part of the pull cylinder amplitude-variable auxiliary arm fails, and great potential safety hazards are easily caused.
Fig. 3 is a schematic diagram of the stress principle of the telescopic luffing jib shown in fig. 1 before the sealing of the luffing cylinder of the jib fails. Fig. 4 is a schematic diagram of the stress principle of the telescopic luffing jib shown in fig. 1 after the seal of the luffing cylinder of the jib fails. The principle of potential safety hazard generated when the cylinder-pulling amplitude-variable auxiliary boom leaks is described in the following with reference to fig. 3 and 4.
As shown in figures 3 and 4, F represents the external load force to which the luffing cylinder 2' of the auxiliary jib is subjectedF acts on the cylinder rod, and the acting direction is the direction in which the cylinder rod is pulled. A. the1Represents the cross-sectional area of the large cavity, A2Representing the cross-sectional area of the small cavity. D represents the inner diameter of the cylinder barrel, and D represents the outer diameter of the cylinder rod. The small cavity of the luffing oil cylinder 2' of the auxiliary jib in the cylinder-pulling luffing auxiliary jib is a working cavity and bears pressure. As shown in fig. 3, before the sealing failure, the stress of the sub-jib variable-amplitude oil cylinder 2' of the pull cylinder variable-amplitude sub-jib is balanced, and the force balance equation is as follows: f ═ P1*A2。
As shown in figure 4, if the sealing fails, the oil in the large cavity is communicated with the oil in the small cavity, the oil in the small cavity enters the large cavity, and the resultant force P of the large cavity and the small cavity2*(A1-A2) In line with the external load force F. Because the volume of the large cavity is larger than that of the small cavity, the oil in the small cavity flows to the large cavity after the sealing failure, the cylinder rod extends out, the luffing cylinder of the auxiliary arm cannot continuously provide pulling force, and the luffing cylinder 2' of the auxiliary arm fails to support the auxiliary arm. Even if the oil ports of the large cavity and the small cavity are sealed due to locking, the volume of the oil cavity sealed between the oil ports of the large cavity and the small cavity is gradually increased when the cylinder rod moves towards the extending direction, so that the hydraulic oil in the small cavity can flow towards the large cavity until the cylinder rod completely extends, and the problem that the supporting failure of the auxiliary arm amplitude-variable oil cylinder 2' on the rotating arm part of the pull cylinder amplitude-variable auxiliary arm due to internal leakage cannot be prevented.
Disclosure of Invention
The invention aims to provide a secondary arm, a cargo boom and a crane of the crane, and aims to solve the problem that potential safety hazards are generated due to internal leakage of a variable-amplitude oil cylinder of the secondary arm of a pull cylinder in the prior art.
The invention provides a first aspect of a jib of a crane, which comprises a jib part and a jib amplitude-variable oil cylinder for driving the jib part to rotate so as to enable the jib part to amplitude, wherein the jib amplitude-variable oil cylinder is provided with a rodless cavity and a rod cavity, and the jib amplitude-variable oil cylinder takes the rodless cavity as a working cavity for supporting the jib part to be kept at a working position.
Furthermore, the rotating arm part is provided with a first oil cylinder connecting end connected with the sub-arm amplitude-varying oil cylinder, the first oil cylinder connecting end is provided with an upper hinge part and a lower hinge part, the sub-arm amplitude-varying oil cylinder is hinged with the lower hinge part of the first oil cylinder connecting end, and the sub-arm amplitude-varying oil cylinder drives the rotating arm part to rotate around the central axis of the upper hinge part of the first oil cylinder connecting end.
Further, rocking arm portion includes swivel mount assembly and sub-jib arm festival assembly, the swivel mount assembly include first hydro-cylinder link with be used for with the arm festival link that sub-jib arm festival assembly is connected, first hydro-cylinder link with arm festival link is located respectively the both ends of swivel mount assembly.
The auxiliary jib further comprises a connecting frame assembly connected with the main jib of the crane, the connecting frame assembly is provided with a second oil cylinder connecting end connected with the auxiliary jib luffing oil cylinder, the second oil cylinder connecting end comprises an upper hinged part and a lower hinged part, and the auxiliary jib luffing oil cylinder is hinged with the lower hinged part of the second oil cylinder connecting end.
The auxiliary jib further comprises a connecting frame assembly connected with the main jib of the crane, the connecting frame assembly is provided with a second oil cylinder connecting end connected with the auxiliary jib luffing oil cylinder, the second oil cylinder connecting end comprises an upper hinged part and a lower hinged part, the auxiliary jib luffing oil cylinder is hinged with the lower hinged part of the second oil cylinder connecting end, and the upper hinged part of the first oil cylinder connecting end is hinged with the upper hinged part of the second oil cylinder connecting end.
Furthermore, a hanging lug of a cylinder rod of the auxiliary arm amplitude-variable oil cylinder is hinged to the lower hinged part of the connecting end of the first oil cylinder, and a hanging lug at the bottom of a cylinder barrel of the auxiliary arm amplitude-variable oil cylinder is hinged to the lower hinged part of the connecting end of the second oil cylinder.
Furthermore, the number of the auxiliary jib variable amplitude oil cylinders is one, and one auxiliary jib variable amplitude oil cylinder is positioned between the left side and the right side of the auxiliary jib; or the number of the auxiliary jib variable amplitude oil cylinders is two, and the two auxiliary jib variable amplitude oil cylinders are symmetrically arranged on the left side and the right side of the auxiliary jib.
Furthermore, the number of the auxiliary jib amplitude-variable oil cylinders is one, the connecting end of the first oil cylinder comprises an inverted first triangular structure, two coaxially arranged upper hinged parts respectively positioned at two vertexes of the upper part of the first triangular structure and a lower hinged part positioned at one vertex of the lower part of the first triangular structure, the second oil cylinder connecting end comprises an inverted second triangular structure, two coaxially arranged upper hinged parts respectively positioned at two vertexes of the upper part of the second triangular structure and a lower hinged part positioned at one vertex of the lower part of the second triangular structure, each upper hinge part of the first oil cylinder connecting end is hinged with the upper hinge part of the second oil cylinder connecting end on the corresponding side, two ends of the auxiliary arm amplitude-variable oil cylinder are respectively hinged with a lower hinged part of the first oil cylinder connecting end and a lower hinged part of the second oil cylinder connecting end; or the number of the sub-arm amplitude-variable oil cylinders is two, the first oil cylinder connecting end comprises a first quadrilateral structure, two coaxially arranged upper hinged parts respectively positioned at two vertex points of the upper part of the first quadrilateral structure and two coaxially arranged lower hinged parts respectively positioned at two vertex points of the lower part of the first quadrilateral structure, the second oil cylinder connecting end comprises a second quadrilateral structure, two coaxially arranged upper hinged parts respectively positioned at two vertex points of the upper part of the second quadrilateral structure and two coaxially arranged lower hinged parts respectively positioned at two vertex points of the lower part of the second quadrilateral structure, each upper hinged part of the first oil cylinder connecting end is hinged with the upper hinged part of the second oil cylinder connecting end on one corresponding side, and two ends of each sub-arm amplitude-variable oil cylinder are respectively hinged with the lower hinged part of the first oil cylinder connecting end on one corresponding side and the lower hinged part of the second oil cylinder connecting end on one corresponding side And (6) connecting.
A second aspect of the present invention provides a crane boom including a main boom and an auxiliary boom connected to the main boom, wherein the auxiliary boom is the auxiliary boom of the crane according to any one of the first aspect of the present invention.
A crane comprising a jib as described in the second aspect of the invention.
Based on the auxiliary arm, the cargo boom and the crane provided by the invention, the auxiliary arm of the crane comprises an auxiliary arm amplitude-variable oil cylinder, and the auxiliary arm amplitude-variable oil cylinder takes a rodless cavity as a working cavity for supporting the rotating arm part of the auxiliary arm to be kept at a working position. When the rotating arm part of the auxiliary arm luffing oil cylinder supporting auxiliary arm of the auxiliary arm is kept at a working position, the large cavity is used as a working cavity, and the cylinder rod is in a pressurized state, so that when the auxiliary arm luffing oil cylinder of the auxiliary arm leaks inwards, the position of the cylinder rod can be maintained basically unchanged because the pressure direction generated by oil is opposite to the direction of an external load force applied to the cylinder rod, the position of the rotating arm part of the auxiliary arm is maintained basically unchanged, the situation that the auxiliary arm luffing oil cylinder fails to support the rotating arm part of the auxiliary arm is avoided, and the problem of potential safety hazard caused by the fact that the auxiliary arm luffing oil cylinder leaks inwards in the prior art can be solved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a partial structural schematic diagram of a cylinder-pulling amplitude-variable sub-boom in the prior art, wherein a sub-boom amplitude-variable oil cylinder is in a fully retracted state.
Fig. 2 is a partial structural schematic diagram of the telescopic jib luffing cylinder of the telescopic luffing jib shown in fig. 1, wherein the telescopic jib luffing cylinder is in a fully retracted state.
Fig. 3 is a schematic diagram of the stress principle of the telescopic luffing jib shown in fig. 1 before the sealing of the luffing cylinder of the jib fails.
Fig. 4 is a schematic diagram of the stress principle of the telescopic luffing jib shown in fig. 1 after the seal of the luffing cylinder of the jib fails.
Fig. 5 is a partial structural view of the jib in accordance with an embodiment of the present invention, wherein the jib luffing cylinder is in a fully extended state.
Fig. 6 is a schematic partial structural view of the jib of the embodiment shown in fig. 5, wherein the jib luffing cylinder is in a fully retracted state.
Fig. 7 is a schematic view of a partial structure at the jib luffing cylinder of the jib of the embodiment shown in fig. 5, wherein the jib luffing cylinder is in a fully extended state.
Fig. 8 is a schematic diagram of the stress principle of the auxiliary jib of the embodiment shown in fig. 5 before the seal of the luffing cylinder of the auxiliary jib fails.
Fig. 9 is a schematic diagram of the stress principle of the auxiliary jib of the embodiment shown in fig. 5 after the seal of the luffing cylinder of the auxiliary jib fails.
In fig. 1 to 2 and 5 to 7, the respective reference numerals represent:
1', 1, connecting frame assembly;
2', 2, an auxiliary jib amplitude variation oil cylinder;
3', 3, a rotating frame assembly;
4', 4, an auxiliary arm section assembly;
5', 5, steel wire ropes;
6', 6 and a pulley bracket assembly.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In the following description, each term representing the orientation is the orientation in which each part of the secondary jib is located after the secondary jib is mounted on the primary jib, wherein "front" refers to the side of the secondary jib from which the weight is lifted; "rear" refers to the side opposite to "front", and "left" and "right" refer to the left-right direction formed when facing forward.
Fig. 5 to 7 show the structure of the sub-arm of the present embodiment. Fig. 5 is a schematic partial structural view of the jib according to the embodiment of the present invention, in which the jib variable-amplitude cylinder is in a fully extended state; FIG. 6 is a schematic illustration of a portion of the structure of the secondary jib of the embodiment shown in FIG. 5, wherein the luffing cylinder of the secondary jib is in a fully retracted state; fig. 7 is a schematic view of a partial structure at the jib luffing cylinder of the jib of the embodiment shown in fig. 5, wherein the jib luffing cylinder is in a fully extended state.
As shown in fig. 5 to 7, the jib of the crane of the present embodiment includes a jib portion and a jib-luffing cylinder 2 for driving the jib portion to rotate to luff the jib. The auxiliary arm variable amplitude oil cylinder 2 is provided with a rodless cavity and a rod cavity, and the auxiliary arm variable amplitude oil cylinder 2 takes the rodless cavity as a working cavity for supporting the rotating arm part to keep at a working position.
In this embodiment, the jib luffing cylinder 2 has a rodless chamber (i.e., a large chamber) as a working chamber for supporting the boom portion of the jib and maintaining it in a working position. When the boom part supporting the secondary boom is held in the working position, the large chamber serves as a working chamber and the cylinder rod is in a pressurized state, and therefore the secondary boom of the present embodiment employs a stepless luffing mechanism in the form of a pressurized cylinder. When internal leakage occurs in the auxiliary arm amplitude-variable oil cylinder 2 of the auxiliary arm, the pressure direction generated by oil liquid is opposite to the direction of an external load force applied to the cylinder rod, so that the position of the cylinder rod can be maintained basically unchanged, the position of a rotating arm part of the auxiliary arm is maintained basically unchanged, the situation that the auxiliary arm amplitude-variable oil cylinder 2 fails to support the rotating arm part of the auxiliary arm is avoided, and the problem of potential safety hazard caused by internal leakage of the auxiliary arm amplitude-variable oil cylinder in the cylinder pulling amplitude-variable auxiliary arm in the prior art can be solved.
Furthermore, the cylinder-pulling amplitude-variable auxiliary arm has extremely high requirements on the welding seam quality, and because the tensile property of the welding seam is far lower than the compressive property of the welding seam, potential safety hazards caused by welding seam defects easily exist, and especially if welding defects exist, stress concentration exists, and safety accidents can be caused by long-term fatigue damage. The auxiliary arm of the embodiment can fully utilize the high compression resistance of the welding seam to avoid the low tensile resistance.
Moreover, the weight of the sub-jib variable-amplitude oil cylinder 2' of the cylinder pulling variable-amplitude sub-jib is relatively heavy, and the performance of the sub-jib is influenced. The reason is that in consideration of the tensile property of the cylinder rod, the cylinder rod of the sub-jib variable-amplitude oil cylinder 2 'of the cylinder pulling variable-amplitude sub-jib is generally designed to be a solid rod, so that the weight of the sub-jib variable-amplitude oil cylinder 2' is heavier; meanwhile, in order to ensure that the oil pressure of the small cavity serving as the working cavity can support the luffing jib part, the sectional area of the small cavity needs to reach the required pressure bearing area, so the inner diameter D of the cylinder barrel of the luffing oil cylinder 2 'of the auxiliary jib of the cylinder-pulling luffing auxiliary jib is relatively larger, the whole volume of the luffing oil cylinder of the auxiliary jib in a tensile mode is larger, and the weight of the luffing oil cylinder 2' of the auxiliary jib is heavier. The auxiliary arm amplitude-variable oil cylinder 2 of the auxiliary arm can be manufactured into a hollow rod because of bearing pressure, and the inner diameter D of the cylinder barrel can be designed to be relatively smaller only by enabling the sectional area of the large cavity to reach the required bearing area because the large cavity bears pressure, so that the weight of the auxiliary arm amplitude-variable oil cylinder 2 is lighter, and the performance of the auxiliary arm can be effectively improved.
The principle that the sub-jib luffing cylinder 2 of the embodiment does not cause support failure of the jib part due to internal leakage caused by seal failure is further described below with reference to fig. 8 and 9. Fig. 8 is a schematic diagram of a force principle of the auxiliary jib of the embodiment shown in fig. 5 before the seal of the luffing cylinder of the auxiliary jib fails; fig. 9 is a schematic diagram of the stress principle of the auxiliary jib of the embodiment shown in fig. 5 after the seal of the luffing cylinder of the auxiliary jib fails.
As shown in FIGS. 8 and 9, F represents an external load force, which presses the cylinder rodActs on the cylinder rod. P1、P2Respectively showing the pressure of the working cavity of the luffing cylinder 2 of the auxiliary boom before and after the sealing failure; a. the1、A2Respectively showing the loading area of a large cavity (rodless cavity) and the sectional area of a small cavity (rod cavity) of the oil cylinder; d represents the inner diameter of the cylinder barrel; d represents the cylinder rod diameter. The rodless cavity, namely the large cavity of the luffing cylinder 2 of the auxiliary jib is used as a working cavity to bear pressure.
As shown in fig. 8, the force balance equation before seal failure: f ═ P1A1。
As shown in fig. 9, if the force balance is achieved after the seal fails, the force balance equation is: p2A1＝P2A2+F；
The two simultaneous formulas can be obtained:
that is, the larger the ratio of the inner diameter D of the cylinder barrel to the diameter D of the cylinder rod, the higher the pressure required for the seal to reach the stress balance in the cylinder after failure, which causes the cylinder body and the oil pipe to elastically deform, and the space for elastic deformation to increase back causes the cylinder rod to retract a little. Because the difference between the cylinder barrel inner diameter D of the auxiliary arm variable-amplitude oil cylinder 2 in a pressurized mode and the cylinder rod diameter D is not large based on the stability and the safety of the oil cylinder, the retraction amount of the cylinder rod is not large as long as the strength of the cylinder body is enough, and basically no obvious expression exists. That is, if the seal of the sub-jib luffing cylinder 2 fails, the large chamber and the small chamber are communicated with each other, and the pressure-bearing area is changed from the sectional area a1 of the piston to the difference between the loading area a1 of the large chamber and the sectional area a2 of the small chamber, which is the sectional area of the cylinder rod. Under the condition that the hydraulic lock works normally, if the cylinder rod needs to retract after the sealing failure, only hydraulic oil in the cylinder can be discharged, but the hydraulic lock blocks an oil way, no way can be used for the hydraulic oil, and therefore the cylinder rod retraction phenomenon basically cannot occur. Therefore, even if the seal of the luffing cylinder 2 of the auxiliary jib fails, the support of the luffing cylinder 2 of the auxiliary jib on the auxiliary jib cannot fail, and the potential safety hazard problem caused by internal leakage can be reduced.
As shown in fig. 5 to 7, in this embodiment, the jib portion of the jib has a first cylinder connection end connected to the jib luffing cylinder 2, the first cylinder connection end has an upper hinge portion and a lower hinge portion, the jib luffing cylinder 2 is hinged to the lower hinge portion of the first cylinder connection end, and the jib luffing cylinder 2 drives the jib portion to rotate around the central axis of the upper hinge portion of the first cylinder connection end.
As shown in fig. 5 to 6, the rotating arm portion includes a rotating frame assembly 3 and at least one sub-arm joint assembly 4 fixedly connected to the rotating frame assembly 3, and the first cylinder connecting end is disposed on the rotating frame assembly 3. The rotating frame assembly 3 is provided with an arm section connecting end, and the rotating frame assembly 3 is connected with the auxiliary arm section assembly 4 through the arm section connecting end. The arm section connecting end and the first oil cylinder connecting end are respectively positioned at the front end and the rear end of the rotating frame assembly 3.
Fig. 5 and 6 show only one sub-arm-joint assembly 4 connected to the rotating frame assembly 3, the sub-arm-joint assembly 4 being mounted on the front end of the rotating frame assembly 3. The auxiliary arm shown in fig. 5 and 6 is in one of the arm length forms of the working state of the auxiliary arm, and more than two auxiliary arm joint assemblies 4 can be connected in sequence to change the arm length of the auxiliary arm.
As shown in fig. 5 to 7, in this embodiment, the sub jib further includes a connecting frame assembly 1 for connecting with the main jib of the crane, the connecting frame assembly 1 has a second cylinder connecting end connected with the sub jib luffing cylinder 2, the second cylinder connecting end includes an upper hinge portion and a lower hinge portion, and the sub jib luffing cylinder 2 is hinged with the lower hinge portion of the second cylinder connecting end.
As shown in fig. 5 to 7, in the embodiment, the upper hinge portion of the first cylinder connection end is hinged to the upper hinge portion of the second cylinder connection end. The link assembly 1 is typically mounted to the head of a main arm or an elongated knuckle of a main arm.
In this embodiment, the number of the sub-jib luffing cylinders 2 is one, and the sub-jib luffing cylinders are arranged between the left side and the right side of the sub-jib. As shown in fig. 5, the first cylinder connection end of the swivel mount assembly 3 has an inverted first triangular structure, and each of three vertices of the first triangular structure has a hinge, wherein two upper hinges are coaxially arranged as upper hinges, and one lower hinge is a lower hinge. The second oil cylinder connecting end of the connecting frame assembly 1 is provided with an inverted second triangular structure, three vertex points of the second triangular structure are respectively provided with a hinge part, wherein two hinge parts at the upper part are upper hinge parts which are coaxially arranged, and one hinge part at the lower part is a lower hinge part. The two upper hinge parts of the rotating frame assembly 3 are correspondingly hinged with the two upper hinge parts of the connecting frame assembly 1. The hanging lug of the cylinder rod of the auxiliary arm amplitude-varying oil cylinder 2 is hinged on the lower hinged part of the first oil cylinder connecting end of the rotating frame assembly 3, and the hanging lug at the bottom of the cylinder barrel of the auxiliary arm amplitude-varying oil cylinder 2 is hinged on the lower hinged part of the second oil cylinder connecting end of the connecting frame assembly 1.
In an embodiment not shown, the number of the luffing cylinders of the auxiliary jib can be two, and the two luffing cylinders of the auxiliary jib are symmetrically arranged on the left side and the right side of the auxiliary jib. For example, the first cylinder connecting end of the swivel mount assembly has a first quadrilateral structure, and four vertices of the first quadrilateral structure respectively have a hinge, wherein two hinges located at the upper part are upper hinges coaxially arranged, and two hinges located at the lower part are lower hinges coaxially arranged. The second oil cylinder connecting end of the connecting frame assembly is provided with a second quadrilateral structure, four vertex points of the second quadrilateral structure are respectively provided with a hinge part, wherein two hinge parts positioned at the upper part are upper hinge parts which are coaxially arranged, and two hinge parts positioned at the lower part are lower hinge parts which are coaxially arranged. The two upper hinge parts of the rotating frame assembly are correspondingly hinged with the two upper hinge parts of the connecting frame assembly respectively. The hanging lug of the cylinder rod of each auxiliary arm amplitude-variable oil cylinder is hinged on the lower hinged part on one side corresponding to the first oil cylinder connecting end of the rotating frame assembly, and the hanging lug at the bottom of the cylinder barrel of each auxiliary arm amplitude-variable oil cylinder is hinged on the lower hinged part on one side corresponding to the second oil cylinder connecting end of the connecting frame assembly.
The sheave bracket assembly 6 and the wire rope 5 in fig. 5 to 7 are components for lifting operation.
When the auxiliary jib of the embodiment is subjected to amplitude variation operation, the rotating frame assembly 3 rotates around the connecting frame assembly 1 by controlling the extension and retraction of the auxiliary jib amplitude variation oil cylinder 2, and the auxiliary jib amplitude variation oil cylinder 2 stops moving and is locked after a target angle is reached, so that the purpose of automatically adjusting the included angle between the auxiliary jib and the main jib is achieved.
As shown in fig. 5 to 7, in the present embodiment, in the fully extended state of the sub jib luffing cylinder 2, the included angle between the sub jib and the main jib is 0 °. When the cylinder rod of the auxiliary jib amplitude-variable oil cylinder 2 is completely retracted, the rotating frame assembly 3 rotates to the maximum angle relative to the connecting frame assembly 1, and the included angle between the auxiliary jib and the main jib is maximum at the moment. When the length of the cylinder rod of the auxiliary jib amplitude-variable oil cylinder 2 is changed between the fully retracted state and the fully extended state, the included angle between the auxiliary jib and the main jib can be adjusted to realize stepless amplitude variation.
The embodiment also provides a crane boom, which comprises a main arm and an auxiliary arm which is connected with the main arm and takes the rodless cavity as a working cavity.
The embodiment also provides a crane, which comprises the crane arm.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (8)
1. A fly jib of a crane, comprising a jib part and a fly jib amplitude cylinder (2) for driving the jib part to rotate so as to make the fly jib amplitude, wherein the fly jib amplitude cylinder (2) is provided with a rodless cavity and a rod cavity, and is characterized in that the fly jib amplitude cylinder (2) takes the rodless cavity as a working cavity for supporting the jib part to be kept at a working position; wherein,
the number of the auxiliary arm variable amplitude oil cylinders (2) is one, one auxiliary arm variable amplitude oil cylinder (2) is positioned between the left side and the right side of the auxiliary arm, the first oil cylinder connecting end of the rotating arm part comprises an inverted first triangular structure, two coaxially arranged upper hinged parts respectively positioned at two vertex points of the upper part of the first triangular structure and a lower hinged part positioned at one vertex point of the lower part of the first triangular structure, the second oil cylinder connecting end of the connecting frame assembly of the auxiliary arm comprises an inverted second triangular structure, two coaxially arranged upper hinged parts respectively positioned at two vertex points of the upper part of the second triangular structure and a lower hinged part positioned at one vertex point of the lower part of the second triangular structure, each upper hinged part of the first oil cylinder connecting end is hinged with the upper hinged part of the second oil cylinder connecting end of the corresponding side, two ends of the auxiliary arm amplitude-variable oil cylinder (2) are respectively hinged with a lower hinge part of the first oil cylinder connecting end and a lower hinge part of the second oil cylinder connecting end; or,
the number of the auxiliary arm variable-amplitude oil cylinders (2) is two, the two auxiliary arm variable-amplitude oil cylinders (2) are symmetrically arranged on the left side and the right side of the auxiliary arm, the first oil cylinder connecting end of the rotating arm part comprises a first quadrilateral structure, two coaxially arranged upper hinged parts respectively positioned at two vertexes of the upper part of the first quadrilateral structure and two coaxially arranged lower hinged parts respectively positioned at two vertexes of the lower part of the first quadrilateral structure, the second oil cylinder connecting end of the connecting frame assembly of the auxiliary arm comprises a second quadrilateral structure, two coaxially arranged upper hinged parts respectively positioned at two vertexes of the upper part of the second quadrilateral structure and two coaxially arranged lower hinged parts respectively positioned at two vertexes of the lower part of the second quadrilateral structure, and each upper hinged part of the first oil cylinder connecting end is hinged with the upper hinged part of the second oil cylinder connecting end on one corresponding side, and two ends of each auxiliary arm amplitude-variable oil cylinder are respectively hinged with the lower hinged part of the first oil cylinder connecting end on one corresponding side and the lower hinged part of the second oil cylinder connecting end on one corresponding side.
2. The jib according to claim 1 wherein the jib portion has a first cylinder connection end connected to the jib luffing cylinder (2), the first cylinder connection end having an upper hinge and a lower hinge, the jib luffing cylinder (2) being hinged to the lower hinge of the first cylinder connection end, the jib luffing cylinder (2) driving the jib portion to rotate about a central axis of the upper hinge of the first cylinder connection end.
3. The sub-arm according to claim 2, wherein the swivel arm portion comprises a swivel frame assembly (3) and a sub-arm joint assembly (4), the swivel frame assembly (3) comprises the first cylinder connection end and an arm joint connection end for connecting with the sub-arm joint assembly (4), and the first cylinder connection end and the arm joint connection end are respectively located at two ends of the swivel frame assembly (3).
4. The secondary jib according to any one of claims 1 to 3, further comprising a connecting frame assembly (1) for connection to a main jib of said crane, said connecting frame assembly (1) having a second cylinder connection end connected to said secondary jib luffing cylinder (2), said second cylinder connection end comprising an upper hinge and a lower hinge, said secondary jib luffing cylinder (2) being hinged to the lower hinge of said second cylinder connection end.
5. The auxiliary jib according to claim 3, further comprising a connecting frame assembly (1) for connecting with the main jib of said crane, said connecting frame assembly (1) having a second cylinder connection end connected with said auxiliary jib luffing cylinder (2), said second cylinder connection end comprising an upper hinge and a lower hinge, said auxiliary jib luffing cylinder (2) being hinged with said second cylinder connection end lower hinge, said first cylinder connection end upper hinge being hinged with said second cylinder connection end upper hinge.
6. The auxiliary arm according to claim 5, characterized in that the hanging lug of the rod of the auxiliary arm luffing cylinder (2) is hinged to the lower hinged part of the first cylinder connecting end, and the hanging lug at the bottom of the cylinder barrel of the auxiliary arm luffing cylinder (2) is hinged to the lower hinged part of the second cylinder connecting end.
7. A crane boom comprising a main arm and an auxiliary arm connected to the main arm, wherein the auxiliary arm is an auxiliary arm of a crane according to any one of claims 1 to 6.
8. A crane comprising a crane boom, characterized in that the crane boom is a crane boom according to claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510510359.8A CN105060140B (en) | 2015-08-19 | 2015-08-19 | Auxiliary, crane arm and the crane of crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510510359.8A CN105060140B (en) | 2015-08-19 | 2015-08-19 | Auxiliary, crane arm and the crane of crane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105060140A CN105060140A (en) | 2015-11-18 |
| CN105060140B true CN105060140B (en) | 2018-03-16 |
Family
ID=54489734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510510359.8A Active CN105060140B (en) | 2015-08-19 | 2015-08-19 | Auxiliary, crane arm and the crane of crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105060140B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106241628A (en) * | 2016-08-25 | 2016-12-21 | 徐州重型机械有限公司 | Truss arm structure and crane |
| CN106115508A (en) * | 2016-08-26 | 2016-11-16 | 南通力威机械有限公司 | A kind of combination type pontoon hangs |
| CN109534191A (en) * | 2018-12-11 | 2019-03-29 | 中联重科股份有限公司 | Auxiliary arm and arm support of crane and crane |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1621334A (en) * | 2003-05-13 | 2005-06-01 | 美国格若沃责任有限公司 | Folding pinnacle bending device |
| CN203382420U (en) * | 2013-07-08 | 2014-01-08 | 徐州重型机械有限公司 | Crane and fixed jib luffing device for same |
| CN204057774U (en) * | 2014-08-15 | 2014-12-31 | 中联重科股份有限公司 | Crane auxiliary arm and crane |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5436907B2 (en) * | 2009-03-27 | 2014-03-05 | 株式会社タダノ | crane |
-
2015
- 2015-08-19 CN CN201510510359.8A patent/CN105060140B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1621334A (en) * | 2003-05-13 | 2005-06-01 | 美国格若沃责任有限公司 | Folding pinnacle bending device |
| CN203382420U (en) * | 2013-07-08 | 2014-01-08 | 徐州重型机械有限公司 | Crane and fixed jib luffing device for same |
| CN204057774U (en) * | 2014-08-15 | 2014-12-31 | 中联重科股份有限公司 | Crane auxiliary arm and crane |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105060140A (en) | 2015-11-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102050392B (en) | Large-tonnage lorry-mounted crane | |
| CN102002936B (en) | Dynamic compactor capable of realizing amplitude-variable followup of A-bracket with arm support | |
| CN105060140B (en) | Auxiliary, crane arm and the crane of crane | |
| CN202936116U (en) | Folding type truck crane | |
| CN106241628A (en) | Truss arm structure and crane | |
| CN105253786A (en) | Folding arm type lorry-mounted crane | |
| CN103613012A (en) | Amplitude changing device of crane capable of changing angles | |
| CN102674172A (en) | Super-lifting device, opening angle control device thereof and crane comprising super-lifting device | |
| CN108529449B (en) | A kind of ship heavy lift derrick | |
| CN104671133A (en) | Marine jib crane luffing structure | |
| CN103482488B (en) | A kind of band jaw can automatic leveling telescoping boom engineering truck | |
| CN217780571U (en) | Wind-powered electricity generation single blade wide-angle installation hoist | |
| CN111137796A (en) | Novel jib crane | |
| CN110054097A (en) | The synchronous telescoping mechanism of lorry-mounted crane | |
| CN201873983U (en) | Dynamic compactor with propeller strut following up amplitude variation of arm support | |
| CN205204682U (en) | Folding arm -type lorry crane | |
| CN209906298U (en) | Novel folding jib loading boom | |
| CN208485573U (en) | Multisection type work jibs | |
| CN216444902U (en) | Novel crane with foldable rotary table | |
| CN216687231U (en) | Multi-stage cylinder telescopic boom for hoisting and automobile crane using same | |
| CN208586571U (en) | Special hanger is turned in oil cylinder of hydraulic headstock gear lifting in power station | |
| AU2022471864A1 (en) | Multi-pulley telescopic mechanism and crane | |
| CN211920683U (en) | An aviation crane hydraulic system | |
| CN212315380U (en) | Tower crane mast lifting device | |
| CN203558766U (en) | Multipoint variable-amplitude lorry-mounted crane |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 221000 No.68, Gaoxin Road, Xuzhou Economic and Technological Development Zone, Xuzhou City, Jiangsu Province Patentee after: Xuzhou Heavy Machinery Co.,Ltd. Address before: 221004 No. 165 Copper Mountain Road, Jiangsu, Xuzhou Patentee before: Xuzhou Heavy Machinery Co.,Ltd. |