CN101983894A - Pretension and lay-off method and device of crane jib for ship - Google Patents
Pretension and lay-off method and device of crane jib for ship Download PDFInfo
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Abstract
The invention relates to a pretension and lay-off method of a crane jib for a ship, belonging to the technical field of a crane. The crane comprises a luffing mechanism composed of a top pulley block, a jib, a winch, a luffing wire rope and a jib head pulley block and a bracket. The method comprises the following steps: A. operating the winch in the forward direction, loosening the jib and laying off the jib onto the bracket; and B, operating the winch in the reverse direction, pulling the jib upwards to enable the pressure of the jib on the bracket to be less than the pressure on the bracket before being subjected to the upward pull, and stopping and shutting off the winch. The invention also relates to a pretension and lay-off device of a crane jib for a ship. The luffing mechanism also comprises a middle pulley arranged at the middle of the jib, and the luffing wire rope is connected with the jib head pulley block and the middle pulley through the top pulley block. The pretension and lay-off method and device of a crane jib for a ship can produce a pretension force on the jib by means of the luffing wire rope, thereby reducing the self-weight load of the jib as well as the influence and the destruction on the jib structure as a result of the shock load and the changing load of the bracket on the jib. Besides, the invention has the advantages of simple method and structure, convenient operation and low cost.
Description
Technical field
The present invention relates to a kind of deck crane, the pretension that particularly relates to a kind of deck crane arm is shelved method and device, belongs to the hoisting crane technical field.
Background technology
Existing deck crane is when off working state, and arm fell and was held on the support that is fixed on hull, and the arm of this moment is two point-supported angular member, bears moment of flexure that self gravitation produces.Different with the land hoisting crane is, the deck crane arm is except the D/W of bearing the arm self gravitation, also need to bear hull jolts and rocks generation in the ship's navigation impact load and alternation load, this moment, impact failure and endurance failure took place in arm easily, particularly marine hurricane is so that each second, 55 meters wind speed caused that hull is jumbo to jolt, arm often needs to bear when being equivalent to mode of operation even higher load, position little for hull, support is in the overlength arm in arm stage casing, the load that is born even can exceed several times of workload.At the deck crane arm because of bearing the hull technical matters that the impact load that rocks generation and alternation load be easy to generate impact failure and endurance failure of jolting, existing technological means is still and adopts traditional enhancing boom structure, improve the mode of its shock resistance and fatigue resistance, yet, this mode can increase the complete machine weight of arm and even hoisting crane, thereby increase the load of hoisting crane and boats and ships, reduce the work efficiency of hoisting crane and the conveying efficiency of boats and ships, particularly be difficult to adapt to needs the ocean engineering boats and ships such as jack-up platform of the restricted requirement of hoisting crane weight.If the arm of shelving is adopted the fixed form that is bundled on support or the boats and ships, then there are problems such as reinforcement process complexity, consolidation time is long, labour intensity is big, be difficult to tackle marine changeable climate, poor stability does not possess feasibility.
Chinese patent notification number: CN86203711, the day for announcing: on February 11st, 1987, a kind of cable tower crane is disclosed, two load-bearing hawsers that are connected between tower arm end and the body of the tower top are arranged, and this hawser is suspending the amplitude variation trolley that moves back and forth along hawser in midair, after the weight lifting, lift heavy all acts on the load-bearing hawser, make the tower arm only bear axial force basically, when having overcome lift heavy and directly acting on the tower arm chord member, the tower arm need bear the shortcoming of very big moment of flexure.Chinese patent notification number: CN2467487Y, the day for announcing: December 26 calendar year 2001, the utility model name is called " tower crane pull bar pulley balancing device ", the connecting device of pulling force between a kind of balancing pull rod is disclosed, the top of tower crane is equipped with pulley, is wound with balanced drag-line on the pulley, and balanced drag-line connects the pull bar of hoisting crane, pulling force between balanced drag-line energy balance crane pull bar, thereby the stability and the work efficiency of raising hoisting crane.The arm of hoisting crane still is subjected to the constraint of load-bearing hawser, pull bar or balanced drag-line in the aforementioned prior art under light condition, arm can not occur and not have the operating mode that constraint is shelved and jolted, more do not solve the impact failure that impact load under this operating mode and alternation load cause arm and the technical matters of endurance failure, load-bearing hawser, balanced drag-line, the isostructural purpose of pulley that is provided with also is intended to improve the stressing conditions of arm when in running order, rather than solves arm and be in stressed disadvantageous technical matters when shelving state.
Summary of the invention
First purpose of the present invention is to overcome existing ship to impact easily and destroy and the defective and the deficiency of endurance failure because of arm bears the jolt impact load that rocks generation and alternation load of hull with what the method for shelving of crane arm existed, provide a kind of pretension of deck crane arm to shelve method, can effectively reduce that arm rocks impact failure that the impact load that bears and alternation load produce and endurance failure because of hull jolts and to the damage of hull, can significantly reduce simultaneously the moment of flexure that crane arm produces in the deadweight of shelving under the state, improve the stressing conditions of arm, alleviate the deadweight of boom structure, prolong arm, the service life of hoisting crane and even boats and ships.
Second purpose of the present invention is to overcome conduct oneself with dignity when the shelving state moment of flexure that produces and be out of shape bigger of arm that existing ship exists with the shelving unit of crane arm, bearing hull jolts the impact load that rocks generation and alternation load and impacts easily and destroy and the defective and the deficiency of endurance failure, a kind of pretension shelving unit of deck crane arm is provided, make arm when shelving state, bear pulling force upwards, thereby significantly reduce moment of flexure and distortion that the arm deadweight produces, simultaneously remarkable attenuative effect is in alternation load and impact load and the consequent endurance failure and the impact failure of arm, and it is simple in structure, easy to operate, safety is good.
The present invention realizes that the technical scheme that first purpose adopts is: a kind of pretension of deck crane arm is shelved method, described deck crane comprises by arm, the top pulleys group, the winch of belt brake, luffing mechanism that arm head assembly pulley and luffing steel rope are formed and the support that is fixed in hull, described top pulleys group is arranged at the top of hoisting crane, the winch of described belt brake and arm are arranged at the both sides of deck crane respectively, described arm head assembly pulley is arranged at the end of arm, there is the luffing steel rope to be connected with arm head assembly pulley on the winch, it is characterized in that may further comprise the steps through the top pulleys group:
A. forward starts winch, loosens the luffing steel rope, arm is moved downward and is shelved on the support;
B. oppositely start winch, tension luffing steel rope makes arm to the pressure of the support pressure to support when loosening that arm is held on the support behind the luffing steel rope, checks and closes winch and get final product.
A kind of pretension of deck crane arm is shelved method, before the described steps A, the middle part pulley is set in the stage casing of arm earlier, and the luffing steel rope on the winch is connected with the middle part pulley with arm head assembly pulley through the top pulleys group.
A kind of pretension of deck crane arm is shelved method, and among the described step B, behind the tension luffing steel rope, it is to loosen when arm is held on the support behind the luffing steel rope 1/4～1/10 of the pressure of support that arm acts on pressure on the support.
A kind of pretension of deck crane arm is shelved method, in the described steps A, also comprise the default value of thrust of setting earlier luffing steel rope tension arm, oppositely start winch tension luffing steel rope among the described step B after be equal to or greater than default value of thrust, check and close winch.
A kind of pretension of deck crane arm is shelved method, and is further comprising the steps of after the described step B:
C. when the prefastening force of luffing steel rope is lower than default value of thrust, pine is stopped and oppositely starts winch, and winch is checked and closed to retighten luffing steel rope after be equal to or greater than default value of thrust again.
The present invention realizes that second technical scheme that purpose adopted is: a kind of pretension shelving unit of deck crane arm, comprise by arm, the top pulleys group, the winch of belt brake, luffing mechanism that arm head assembly pulley and luffing steel rope are formed and the support that is fixed on hull, described top pulleys group is arranged on the top of deck crane, the winch of described belt brake and arm are arranged at the both sides of hoisting crane respectively, described arm head assembly pulley is arranged on the end of arm, in the described luffing mechanism, also comprise the middle part pulley that is arranged at the arm stage casing, the luffing steel rope on the described winch is connected with the middle part pulley with arm head assembly pulley through the top pulleys group.
A kind of pretension shelving unit of deck crane arm, described arm head assembly pulley comprises the first head pulley, described top pulleys group comprises first top pulleys, second top pulleys and the 3rd top pulleys, one end of described luffing steel rope is fastened on winch, the other end is walked around first top pulleys, the first head pulley, second top pulleys, middle part pulley and the 3rd top pulleys successively, is wrapped on the winch in the same way again.
A kind of pretension shelving unit of deck crane arm, described arm head assembly pulley comprises the first head pulley and the second head pulley, described top pulleys group comprises first top pulleys, second top pulleys, the 3rd top pulleys and the 4th top pulleys, one end of described luffing steel rope is fastened on winch, the other end is walked around first top pulleys, the first head pulley, second top pulleys, middle part pulley, the 3rd top pulleys, the second head pulley and the 4th top pulleys successively, is wrapped on the winch in the same way again.
Compared with prior art, beneficial effect of the present invention is:
1. by the luffing steel rope arm is applied a certain size predetermincd tension, can obviously reduce the bearing force of support to arm, jolt when rocking at ship's navigation, hull, this bearing force changes, reduce this bearing force and can reduce alternation load and the impact load that support acts on arm, avoid arm to produce endurance failure and impact failure, prolong the service life of arm.
2. the luffing steel rope has formed the new fulcrum of arm to the pulling force point of arm, has reduced the span as the arm of angular member, thereby has reduced the moment of flexure peak value of arm, and the whole load of arm is alleviated and distributing equilibrium greatly, has improved the stressing conditions of arm.
3. the luffing steel rope is upwards strained arm, limited the upper and lower displacement of arm in fluctuating is rocked, and bears the endurance failure that alternation load up and down causes repeatedly thereby reduced arm.
4, the assumed load of arm significantly reduces, the cross-sectional area of its structure is also corresponding to be reduced, thereby the deadweight of arm and even the deadweight of deck crane are also reduced, particularly adapt to needs the ocean engineering boats and ships such as jack-up platform of the restricted requirement of hoisting crane weight.
5. the amount of force of luffing steel rope tractive arm can or be loosened the luffing steel rope and regulate by the tension of rotation winch, and its apparatus structure is simple, with low cost, easy to use.
Description of drawings
Fig. 1 is the structural representation of deck crane arm pretension shelving unit of the present invention.
Fig. 2 is that deck crane arm pretension of the present invention is shelved first kind of structural representation that method is used.
Fig. 3 is second kind of structural representation using of the deck crane arm pretension of the present invention method of shelving and first kind of structural representation of pretension shelving unit.
Fig. 4 is that deck crane arm pretension of the present invention is shelved the third structural representation of method application and second kind of structural representation of pretension shelving unit.
Among the figure: arm head assembly pulley 1, the first head pulley 11, the second head pulley 12, luffing steel rope 2, middle part pulley 3, top pulleys group 4, first top pulleys, 41, the second top pulleys, 42, the three top pulleys 43, the 4th top pulleys 44, the winch 5 of belt brake, support 6, arm 7, hull 8.
The specific embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Referring to Fig. 2, deck crane arm pretension of the present invention is shelved first kind of structural representation that method is used, the top of deck crane is provided with top pulleys group 4, the both sides of deck crane are respectively arranged with the winch 5 and the arm 7 of belt brake, the end of arm 7 is provided with arm head assembly pulley 1, there is luffing steel rope 2 to be connected with arm head assembly pulley 1 on the winch 5 through top pulleys group 4, wherein, top pulleys group 4 comprises first top pulleys 41 and second top pulleys 42, arm head assembly pulley 1 comprises the first head pulley 11, luffing steel rope 2 one ends are fastened on winch 5, one end is walked around first top pulleys 41 successively, the first head pulley 11, second top pulleys 42 is wrapped on the winch 5 more in the same way.
The pretension method of shelving of deck crane arm may further comprise the steps:
A. forward starts winch 5, loosens luffing steel rope 2, makes arm 7 move downward and be shelved on the support 6;
B. oppositely start winch 5, tension luffing steel rope 2, the pressure that makes 7 pairs of supports 6 of arm to the pressure of support 6, are checked and are closed winch 5 and get final product when loosening luffing steel rope 2 back arms 7 and be held on the support 6.
The pretension of deck crane arm provided by the invention is shelved method, can also be before steps A, earlier on the same side leading sheave is set on hoisting crane column top mutually with winch 5, the luffing steel rope 2 on the winch 5 links to each other with arm head assembly pulley 1 through leading sheave, top pulleys group 4.Leading sheave can be controlled the sense of motion of luffing steel rope 2, makes luffing steel rope 2 keep certain distance with the hoisting crane column all the time, prevents that luffing steel rope 2 on the gos and hoisting crane column from rubbing, and influences the operation of its motion or luffing mechanism.
After implementing arm pretension provided by the invention and shelving method, implement pulling force upwards by 2 pairs of arms of luffing steel rope 7, significantly reduced the bearing force of 6 pairs of arms 7 of support, under ship's navigation, hull jolt the situation of rocking, this bearing force changes, can reduce alternation load and the impact load that support acts on arm so reduce this bearing force, avoid arm to produce endurance failure and impact failure, prolong the service life of arm.On the other hand, the pulling force point of 2 pairs of arms 7 of luffing steel rope has formed the new fulcrum of arm, reduced span as the arm 7 of angular member, thereby the moment of flexure peak value and the maximum defluxion of arm 7 have been reduced, arm 7 whole loads and strain are reduced and distributing equilibrium greatly, improved the stressing conditions of arm 7.In addition, luffing steel rope 2 is upwards strained arm 7, limited arm 7 downward displacement in fluctuating is rocked, and has reduced arm 7 and has born the endurance failure that the bigger load of alternation up and down and distortion cause repeatedly.Deck crane arm pretension provided by the invention is shelved method, ingeniously utilized existing luffing mechanism, make luffing mechanism not only can when deck crane is worked, be used to change lifting amplitude and scope, the pretension that can also be used for arm when deck crane quits work is shelved, and this method is simple to operate, effect is remarkable, safe and reliable.
The pretension of deck crane arm provided by the invention is shelved method, the prefastening force of luffing steel rope 2 can be regulated by the rotation of winch 5, rotation tension by winch 5 or unclamp luffing steel rope 2, can increase or reduce the pretension of luffing steel rope 2, the apparatus structure of the prefastening force of this adjusting arm 7 is simple, with low cost, easy to use.
The pretension of deck crane arm provided by the invention is shelved method, before steps A, middle part pulley 3 is set in the stage casing of arm 7 earlier, and the luffing steel rope 2 on the winch 5 is connected with middle part pulley 3 with arm head assembly pulley 1 through top pulleys group 4.
Referring to Fig. 3, the pretension of deck crane arm provided by the invention is shelved second kind of structural representation that method is used, wherein, top pulleys group 4 comprises first top pulleys 41, second top pulleys 42 and the 3rd top pulleys 43, arm head assembly pulley comprises the first head pulley 11, luffing steel rope 2 one ends are fastened on winch 5, the other end is walked around first top pulleys 41, the first head pulley 11, second top pulleys 42, middle part pulley 3, the 3rd top pulleys 43 successively, is fastened in the same way on winch 5 then.
Referring to Fig. 4, the pretension of deck crane arm provided by the invention is shelved the third structural representation that method is used, wherein, arm head assembly pulley 1 comprises the first head pulley 11 and the second head pulley 12, top pulleys group 4 comprises first top pulleys 41, second top pulleys 42, the 3rd top pulleys 43 and the 4th top pulleys 44, the stage casing of arm 7 also is provided with middle part pulley 3, one end of luffing steel rope 2 is fastened on winch 5, the other end is walked around first top pulleys 41 successively, the first head pulley 11, second top pulleys 42, middle part pulley 3, the 3rd top pulleys 43, the second head pulley 12 and the 4th top pulleys 44 are wrapped on the winch 5 more in the same way.
The setting of middle part pulley 3, further increased arm 7 fulcrum, reduced span, strengthened the tension that arm 7 is made progress, the deformation displacement that has limited arm 7 as the arm 7 of angular member, thereby further alleviated arm from the impact load of heavy load, 6 pairs of arms 7 of support and alternation load influence and destruction to boom structure.Luffing steel rope 2 is implemented pulling force upwards to arm 7 simultaneously by end pulley 1 and middle part pulley 3, and the adjusting by pulley makes two pulling force synchronous, forms statically determimate structure, make structure stress evenly, good stability.
The pretension of deck crane arm provided by the invention is shelved method, behind the tension luffing steel rope 2, arm 7 acts on the pressure on the support 6, be to 1/4～1/10 of the pressure of support 6 when loosening luffing steel rope 2 back arms 7 and being held on the support 6, impact failure and endurance failure that the bearing force of 6 pairs of arms 7 of support is produced are reduced to minimum, guarantee simultaneously that arm 7 is in stablely to shelve and be unlikely to unsettled.
The pretension of deck crane arm provided by the invention is shelved method, in steps A, also comprise the default pulling force that preestablishes luffing steel rope 2 tension arms 7, oppositely start winch 5 tension luffing steel ropes 2 among the step B when being equal to or greater than default pulling force, can check and close winch 5.The size setting of the default pulling force of luffing steel rope 2 and deadweight, the hull of arm 7 degree of rocking of jolting is relevant, arm 7 deadweights are big more, hull jolts, and the amplitude of rocking is big more, the default pulling force of luffing steel rope 2 should be big more, but prefastening force can not surpass the power that overcomes arm 7 deadweights simultaneously.Before deck crane arm 7 is implemented pretension, parameters such as the degree of rocking of can jolting according to deadweight, the hull of arm 7 determine that needs luffing steel rope 2 acts on the default pulling force size of arm 7, can make on the one hand more convenient to operate that pretension shelves, can also realize accurate pretension on the other hand, make arm 7 be in best stressing conditions arm 7.
The pretension of deck crane arm provided by the invention is shelved method, further comprising the steps of after the step B: C, when the prefastening force of luffing steel rope 2 is lower than default pulling force, pine is stopped and oppositely starts winch 5, winch 5 is checked and closed to tension luffing steel rope 2 after be equal to or greater than default value of thrust.Luffing steel rope 2 is in tension for a long time and may produces loosening, hull jolts repeatedly to rock and also may cause the loosening of luffing steel rope 2 in addition, make the prefastening force value of luffing steel rope 2 be lower than default value of thrust, at this moment can stop and reverse opening winch 5 by pine, retighten luffing steel rope 2 is after be equal to or greater than default value of thrust, check and close winch 5, be in best stressing conditions to guarantee arm.
Referring to Fig. 1, a kind of structural representation of deck crane arm pretension shelving unit, the top of deck crane is provided with top pulleys group 4, the both sides of deck crane are respectively arranged with the winch 5 and the arm 7 of belt brake, the end of arm 7 is provided with arm head assembly pulley 1, the middle part is provided with middle part pulley 3, has luffing steel rope 2 to be connected with middle part pulley 3 with arm head assembly pulley 1 through top pulleys group 4 on the winch 5.
The setting of middle part pulley 3, further increased arm 7 fulcrum, reduced span, strengthened the tension that arm 7 is made progress, the deformation displacement that has limited arm 7 as the arm 7 of angular member, thereby further alleviated arm from the impact load of heavy load, 6 pairs of arms 7 of support and alternation load influence and destruction to boom structure.Luffing steel rope 2 is implemented pulling force upwards to arm 7 simultaneously by end pulley 1 and middle part pulley 3, and the adjusting by pulley makes two pulling force synchronous, forms statically determimate structure, make structure stress evenly, good stability.On the other hand, when deck crane is worked, the middle part pulley 3 that increases has increased the ran number of the luffing steel rope 2 of tractive arm 7 simultaneously, has reduced by every section pulling force that steel rope bears, and is applicable to overlength arm that deadweight is bigger and the situation of steel rope undercapacity.
Referring to Fig. 3, first kind of structural representation of the pretension shelving unit of deck crane arm provided by the invention, wherein, arm head assembly pulley 1 comprises the first head pulley 11, top pulleys group 4 comprises first top pulleys 41, second top pulleys 42 and the 3rd top pulleys 43, one end of luffing steel rope 2 is fastened on winch 5, the other end is walked around first top pulleys 41, the first head pulley 11, second top pulleys 42, middle part pulley 3 and the 3rd top pulleys 43 successively, is wrapped in the same way on the winch 5 again.
Referring to Fig. 4, second kind of structural representation of the pretension shelving unit of deck crane arm provided by the invention, wherein, arm head assembly pulley 1 comprises the first head pulley 11 and the second head pulley 12, top pulleys group 4 comprises first top pulleys 41, second top pulleys 42, the 3rd top pulleys 43 and the 4th top pulleys 44, one end of luffing steel rope 2 is fastened on winch 5, the other end is walked around first top pulleys 41 successively, the first head pulley 11, second top pulleys 42, middle part assembly pulley 3, the 3rd top pulleys 43, the second head pulley 12 and the 4th top pulleys 44 are wrapped on the winch 5 more in the same way.
Arm head assembly pulley 1 is made up of 2 pulleys, has increased the ran number of luffing steel rope 2 tractive arms 7, has reduced by every section pulling force that steel rope bears, and is applicable to tractive conduct oneself with dignity king-sized overlength arm and the situation of steel rope undercapacity of needing.
In conjunction with the accompanying drawings embodiments of the invention are specified above, but the present invention is not limited to the foregoing description, in the ken that those of ordinary skills possessed, can also makes various variations not breaking away under the aim prerequisite of the present invention.
Claims (8)
1. the pretension of a deck crane arm is shelved method, described deck crane comprises by arm (7), top pulleys group (4), the winch of belt brake (5), luffing mechanism that arm head assembly pulley (1) and luffing steel rope (2) are formed and the support (6) that is fixed in hull (8), described top pulleys group (4) is arranged at the top of hoisting crane, winch of described belt brake (5) and arm (7) are arranged at the both sides of deck crane respectively, described arm head assembly pulley (1) is arranged at the end of arm (7), there is luffing steel rope (2) to be connected with arm head assembly pulley (1) on the winch (5), it is characterized in that may further comprise the steps through top pulleys group (4):
A. forward starts winch (5), loosens luffing steel rope (2), makes arm (7) move downward and be shelved on the support (6);
B. oppositely start winch (5), tension luffing steel rope (2), make arm (7) be held on support (6) pressure to support (6) when going up less than loosening luffing steel rope (2) back arm (7), check and close winch (5) and get final product the pressure of support (6).
2. the pretension of a kind of deck crane arm according to claim 1 is shelved method, it is characterized in that: before the described steps A, middle part pulley (3) is set in the stage casing of arm (7) earlier, and the luffing steel rope (2) on the winch (5) is connected with middle part pulley (3) with arm head assembly pulley (1) through top pulleys group (4).
3. the pretension of a kind of deck crane arm according to claim 1 is shelved method, it is characterized in that: among the described step B, after tension luffing steel rope (2), arm (7) act on pressure on the support (6) be loosen luffing steel rope (2) back arm (7) be held on support (6) when going up to 1/4～1/10 of the pressure of support (6).
4. the pretension of a kind of deck crane arm according to claim 1 is shelved method, it is characterized in that: in the described steps A, also comprise the default value of thrust of setting luffing steel rope (2) tension arm (7) earlier, oppositely start winch (5) tension luffing steel rope (2) among the described step B after be equal to or greater than default value of thrust, check and close winch (5).
5. the pretension of a kind of deck crane arm according to claim 4 is shelved method, it is characterized in that: further comprising the steps of after the described step B:
C. when the prefastening force of luffing steel rope (2) is lower than default value of thrust, pine is stopped and oppositely starts winch (5), and winch (5) is checked and closed to retighten luffing steel rope (2) after be equal to or greater than default value of thrust again.
6. the pretension shelving unit of a deck crane arm, comprise by arm (7), top pulleys group (4), the winch of belt brake (5), luffing mechanism that arm head assembly pulley (1) and luffing steel rope (2) are formed and the support (6) that is fixed on hull (8), described top pulleys group (4) is arranged on the top of deck crane, winch of described belt brake (5) and arm (7) are arranged at the both sides of hoisting crane respectively, described arm head assembly pulley (1) is arranged on the end of arm (7), it is characterized in that: in the described luffing mechanism, also comprise the middle part pulley (3) that is arranged at arm (7) stage casing, the luffing steel rope (2) on the described winch (5) is connected with middle part pulley (3) with arm head assembly pulley (1) through top pulleys group (4).
7. the pretension shelving unit of a kind of deck crane arm according to claim 6, be characterised in that: described arm head assembly pulley (1) comprises the first head pulley (11), described top pulleys group (4) comprises first top pulleys (41), second top pulleys (42) and the 3rd top pulleys (43), one end of described luffing steel rope (2) is fastened on winch (5), the other end is walked around first top pulleys (41) successively, the first head pulley (11), second top pulleys (42), middle part pulley (3) and the 3rd top pulleys (43) are wrapped on the winch (5) more in the same way.
8. the pretension shelving unit of a kind of deck crane arm according to claim 6, be characterised in that: described arm head assembly pulley (1) comprises the first head pulley (11) and the second head pulley (12), described top pulleys group (4) comprises first top pulleys (41), second top pulleys (42), the 3rd top pulleys (43) and the 4th top pulleys (44), one end of described luffing steel rope (2) is fastened on winch (5), the other end is walked around first top pulleys (41) successively, the first head pulley (11), second top pulleys (42), middle part pulley (3), the 3rd top pulleys (43), the second head pulley (12) and the 4th top pulleys (44) are wrapped on the winch (5) more in the same way.
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| CN 201010547706 CN101983894B (en) | 2010-11-17 | 2010-11-17 | Pretension and lay-off method and device of crane jib for ship |
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| CN 201010547706 CN101983894B (en) | 2010-11-17 | 2010-11-17 | Pretension and lay-off method and device of crane jib for ship |
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| CN104401874A (en) * | 2014-10-11 | 2015-03-11 | 太原科技大学 | Assessment method of whole-course real-time service life of lifting steel wire rope of crane |
| CN104750908A (en) * | 2015-01-22 | 2015-07-01 | 山东建筑大学 | Method and device for obtaining tower crane cargo boom prestress |
| CN106744380A (en) * | 2017-03-24 | 2017-05-31 | 青岛海西重机有限责任公司 | Rigid luffing single arm support loop wheel machine peculiar to vessel and its folding and unfolding method |
| CN106966309A (en) * | 2017-05-10 | 2017-07-21 | 中铁工程机械研究设计院有限公司 | A kind of arm of multiple equilibrium elevation angle adjustable shelves locking device and method |
| CN107458967A (en) * | 2017-08-08 | 2017-12-12 | 青岛海西重机有限责任公司 | The new canoe and device of a kind of single arm support crane rope compensation system |
| CN107487724A (en) * | 2017-08-16 | 2017-12-19 | 青岛海西重机有限责任公司 | A kind of the large-scale floating crane arm support erecting device and installation method of non-loop wheel machine auxiliary |
| CN108466956A (en) * | 2018-03-30 | 2018-08-31 | 南通振华重型装备制造有限公司 | A kind of 2000t crane barges crane main hook steel wire rope pretightening technology |
| CN113460240A (en) * | 2021-08-16 | 2021-10-01 | 青岛海西重机有限责任公司 | Protection device for slender structural member in marine transportation process |
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| GB2096097B (en) * | 1981-04-04 | 1984-12-19 | Mannesmann Ag | Telescopic jib cranes |
| CN101746480A (en) * | 2008-12-12 | 2010-06-23 | 中国海洋石油总公司 | Technique for assembling large revolving crane on crane ship |
| CN201338919Y (en) * | 2009-01-20 | 2009-11-04 | 徐州重型机械有限公司 | Caterpillar crane and tension device thereof |
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Cited By (14)
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|---|---|---|---|---|
| CN102910541A (en) * | 2012-10-18 | 2013-02-06 | 宝鸡石油机械有限责任公司 | Ocean platform crane with buggy luffing mechanism |
| CN102910541B (en) * | 2012-10-18 | 2015-02-11 | 宝鸡石油机械有限责任公司 | Ocean platform crane with buggy luffing mechanism |
| CN104401874A (en) * | 2014-10-11 | 2015-03-11 | 太原科技大学 | Assessment method of whole-course real-time service life of lifting steel wire rope of crane |
| CN104401874B (en) * | 2014-10-11 | 2016-02-03 | 太原科技大学 | The appraisal procedure in crane hoisting wire rope omnidistance life-span in real time |
| CN104750908A (en) * | 2015-01-22 | 2015-07-01 | 山东建筑大学 | Method and device for obtaining tower crane cargo boom prestress |
| CN104750908B (en) * | 2015-01-22 | 2021-03-05 | 山东建筑大学 | Method and device for acquiring prestress of tower crane boom |
| CN106744380B (en) * | 2017-03-24 | 2018-08-07 | 青岛海西重机有限责任公司 | Rigid luffing single arm support loop wheel machine peculiar to vessel and its folding and unfolding method |
| CN106744380A (en) * | 2017-03-24 | 2017-05-31 | 青岛海西重机有限责任公司 | Rigid luffing single arm support loop wheel machine peculiar to vessel and its folding and unfolding method |
| CN106966309A (en) * | 2017-05-10 | 2017-07-21 | 中铁工程机械研究设计院有限公司 | A kind of arm of multiple equilibrium elevation angle adjustable shelves locking device and method |
| CN107458967A (en) * | 2017-08-08 | 2017-12-12 | 青岛海西重机有限责任公司 | The new canoe and device of a kind of single arm support crane rope compensation system |
| CN107487724A (en) * | 2017-08-16 | 2017-12-19 | 青岛海西重机有限责任公司 | A kind of the large-scale floating crane arm support erecting device and installation method of non-loop wheel machine auxiliary |
| CN107487724B (en) * | 2017-08-16 | 2020-04-14 | 青岛海西重机有限责任公司 | Non-crane-assisted large floating crane arm support mounting device and mounting method |
| CN108466956A (en) * | 2018-03-30 | 2018-08-31 | 南通振华重型装备制造有限公司 | A kind of 2000t crane barges crane main hook steel wire rope pretightening technology |
| CN113460240A (en) * | 2021-08-16 | 2021-10-01 | 青岛海西重机有限责任公司 | Protection device for slender structural member in marine transportation process |
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