CN102849632A - A crane auxiliary jib automatic retraction and releasing device and a crane - Google Patents

A crane auxiliary jib automatic retraction and releasing device and a crane Download PDF

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Publication number
CN102849632A
CN102849632A CN2011101794419A CN201110179441A CN102849632A CN 102849632 A CN102849632 A CN 102849632A CN 2011101794419 A CN2011101794419 A CN 2011101794419A CN 201110179441 A CN201110179441 A CN 201110179441A CN 102849632 A CN102849632 A CN 102849632A
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CN
China
Prior art keywords
tooth bar
crane
auxiliary
arm
automatic retraction
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CN2011101794419A
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Chinese (zh)
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CN102849632B (en
Inventor
朱延
张晓广
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三一汽车起重机械有限公司
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Priority to CN201110179441.9A priority Critical patent/CN102849632B/en
Publication of CN102849632A publication Critical patent/CN102849632A/en
Application granted granted Critical
Publication of CN102849632B publication Critical patent/CN102849632B/en

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Abstract

The invention discloses a crane auxiliary jib automatic retraction and releasing device. The device comprises a hydraulic oil cylinder (60), a gear (70), a rack (80) and a revolving shaft (90). The hydraulic oil cylinder (60) and the rack (80) are together located at one side of a crane main jib (10) close to the auxiliary jib (20). The gear (70) and the revolving shaft (90) are coaxially fixed. The revolving shaft (90) is fixed between upper and lower joints at one side of the auxiliary jib (20) close to the main jib. An axial line of the revolving shaft (90) is coincident with the hinge center of the upper and lower joints. One end of the rack is engaged with the gear, and the other end is connected with a movable end of the hydraulic oil cylinder (60). The device enables the auxiliary jib to perform wide-range automatic revolution in a second phase of the entire revolving process. The invention also discloses a crane provided with the crane auxiliary jib automatic retraction and releasing device.

Description

The automatic retraction device of a kind of crane subsidiary arm and hoisting crane
Technical field
The present invention relates to technical field of engineering machinery, particularly relate to the automatic retraction device of crane subsidiary arm.The invention still further relates to the hoisting crane that is provided with described automatic retraction device.
Background technology
Hoisting crane is a kind ofly to utilize the crane arm weight of slinging in when work, then relies on rotation of rotary table with the construction machinery and equipment of weight from a position transfer to the another one position.
As seen, crane arm is the main actuating unit of crane loading weight, the low-alloy high-strength steel plate that the many employings of its material have larger bending rigidity is abandoned and is welded into Thin-walled box structure, has very large load-carrying capacity, each telescopic boom that is sleeved in the basic arm is controlled free-extension by hydraulic actuating cylinder, can satisfy the needs of different hoisting heights.
The principal arm of crane arm because of be subjected to himself telescoping mechanism difficult arrangement, from the impact of the factor such as great, and in the transition process, to the objective requirement of alerting ability, its length is very limited.Generally speaking, the principal arm joint number is limited in five joints, the principal arm maximum height of lift is limited in below the 50m, for adapting to the requirement of in the engineering reality hoisting crane being hung greatly the width of cloth, high lifting altitude, the mode that normal employing is set up auxiliary at main arm of crane solves, auxiliary replenishes and development as principal arm, has effectively improved work range and the lifting altitude of hoisting crane.
Please refer to Fig. 1, Fig. 1 is the principal arm of hoisting crane in the prior art and the structural representation of auxiliary thereof.
The auxiliary 2 of hoisting crane ' generally formed by two joint arms, one joint is box type construction for truss structure, a joint, principal arm 1 ' with auxiliary 2 ' between be connected by bearing pin, whole auxiliary 2 ' gross weight surpass 1.5t, auxiliary 2 ' generally be arranged in principal arm 1 ' one side, during withdrawal by bracket 3 ' fixing, auxiliary 2 during operation ' afterbody need to be hinged with the support 1-1 ' of principal arm 1 ' front end, for reaching this operating condition, auxiliary 2 ' need to turn round around axle.
Auxiliary 2 ' revolution be divided into two stages, at F/s, the less angle of revolution of auxiliary 2 ' outwards makes the hinge of its afterbody one side overlap with the hinge of principal arm 1 ' front end one side, then insert bearing pin 4 ', realization principal arm 1 ' with auxiliary 2 ' part be connected; In subordinate phase, auxiliary 2 ' around the bearing pin 4 that inserts ' continuations revolution, until the hinge of its afterbody opposite side overlaps with the hinge of principal arm 1 ' front end opposite side, at last, insert again bearing pin, realization principal arm 1 ' with auxiliary 2 ' be connected fully.
At present, the action of the rotating F/s of auxiliary and subordinate phase is mainly finished by manually pulling, because the degreeof turn of F/s is less, therefore realize than being easier to, but in subordinate phase, this manually-operated mode implements very difficult, and inefficiency is particularly for large-tonnage hoisting crane more than 80 tons, owing to many-sided reasons such as the impact that is subjected to the auxiliary deadweight and manufacturing errorss, the rotation auxiliary is more time-consuming, effort, and operation is absolutely unsafe.
Please refer to Fig. 2, Fig. 2 is the structural representation of a kind of crane subsidiary arm retractable electrofluidic control device in the prior art.
To this, Granted publication number discloses a kind of crane subsidiary arm retractable electrofluidic control device for the utility model patent specification sheets of CN 2813564Y, the midway location of its principal arm 3 is connected with auxiliary bracket 4, between the front portion of the rear portion of auxiliary 2 and principal arm 2, be connected with rotating shaft 5 and electro-hydraulic driver 1, utilize the hydraulic actuating cylinder of solenoid control as auxiliary power, application force by oil cylinder piston pole pair auxiliary support, make auxiliary around the outside rotary expansion of the rotating shaft of principal arm side or inwardly rotation harvesting, be not rotated and do not need manually to spur auxiliary.
This patent uses hydraulic ram as direct drive unit, because the hydraulic ram power-assisted is limited in scope, can only make auxiliary automatic deploying and retracting in less angular range, causes revolution action major part also will depend on the manpower traction.
In addition, after auxiliary leaves carriage, because quality is larger, can produce downwarp because of deadweight, often go wrong in the process of opening or reclaiming, for example the hinge hole of principal arm front end can not accurately overlap with the hinge hole of auxiliary, causes the plug bearing pin very difficult, these all can take time of setting up, cause assembly problem in various degree.
Therefore, how making auxiliary can carry out large-scale automatic rotary in the subordinate phase of its whole turning course, is the present technical issues that need to address of those skilled in the art.
Summary of the invention
The first purpose of the present invention provides the automatic retraction device of a kind of crane subsidiary arm.This device can make auxiliary carry out large-scale automatic rotary in the subordinate phase of its whole turning course.
The second purpose of the present invention provides a kind of hoisting crane with above-mentioned automatic retraction device.
In order to realize above-mentioned the first purpose, the invention provides the automatic retraction device of a kind of crane subsidiary arm, comprise hydraulic ram, gear, tooth bar and axis of revolution; Described hydraulic ram and tooth bar are close to a side of described auxiliary with the principal arm of being located at described hoisting crane, described gear is coaxial fixing with axis of revolution; Described axis of revolution is fixed between the upper and lower joint that described auxiliary is close to described principal arm one side, and the hinged center of its axis and described upper and lower joint coincides; One end of described tooth bar is meshed with described gear, the other end is connected with the movable end of described hydraulic ram.
Preferably, the side of described principal arm is provided with the tooth bar support of the described tooth bar of some supports.
Preferably, described support is provided with gear, tooth bar clearance adjustment mechanism.
Preferably, described clearance adjustment mechanism comprises the nut that is fixed in described internal stent and the adjusting bolt that cooperates with described nut thread, and the head of described adjusting bolt is supported in the back side of described tooth bar.
Preferably, described support is opening towards " U " of described auxiliary shape, and pad is provided with slide block between the contact surface of described tooth bar and support.
Preferably, described slide block comprises the upper and lower slide block between the upper and lower contact surface of described tooth bar and support, and the side slide block between described tooth bar and adjusting bolt.
Preferably, described axis of revolution and upper and lower joint are the integral type structure.
Preferably, described hydraulic ram is fixed in the basic arm of described principal arm.
Preferably, described gear is helical wheel, and its axial force direction is opposite with gravity direction.
In order to realize above-mentioned the second purpose, the present invention also provides a kind of hoisting crane, comprises crane main body, principal arm and auxiliary, is provided with the automatic retraction device of above-mentioned each described crane subsidiary arm.
The automatic retraction device of crane subsidiary arm provided by the present invention has been done further improvement on the basis of existing technology, its hydraulic ram and tooth bar are arranged on a side of main arm of crane next-door neighbour auxiliary, gear and axis of revolution are arranged between the upper and lower joint that described auxiliary is close to described principal arm one side, and the hinged center of the axis of axis of revolution and described upper and lower joint coincides.Like this, when auxiliary finishes the F/s revolution, and plug bearing pin make auxiliary and principal arm local hinged after, the primer fluid compressing cylinder is done expanding-contracting action, just can be by rack drives gear and axis of revolution rotation, because axis of revolution is fixed on the upper of auxiliary one side, between the lower adaptor, during the axis of revolution rotation, auxiliary certainly will rotate thereupon together, carry out the purpose of automatic rotary (emit and regain) on a large scale thereby reach by hydraulic ram drive auxiliary at the second rotary phase, and need not manually to pull, compare with auxiliary revolution mode in the past, not only easy to operate, and more save manpower, time.
In a kind of specific embodiment, described support is provided with gear, tooth bar clearance adjustment mechanism.Can make wheel and rack engagement or disengaging by clearance adjustment mechanism, also the gap between the wheel and rack can be adjusted to proper states, thereby improve its rotating reliability.
In the another kind of specific embodiment, described gear is helical wheel, and its axial force direction is opposite with gravity direction.Here, the characteristics of utilizing the helical teeth wheel and rack to match can produce the lifting power opposite with gravity direction in the rotating while, to suppress auxiliary because of the downwarp that deadweight produces, avoid occurring assembly problem, and the action of plug bearing pin can be carried out smoothly when making assembling.
Hoisting crane provided by the present invention is provided with the automatic retraction device of above-mentioned crane subsidiary arm, because the automatic retraction device of above-mentioned crane subsidiary arm has above-mentioned technique effect, the hoisting crane with the automatic retraction device of this crane subsidiary arm also should possess corresponding technique effect.
Description of drawings
Fig. 1 is the principal arm of hoisting crane in the prior art and the structural representation of auxiliary thereof;
Fig. 2 is the structural representation of a kind of crane subsidiary arm retractable electrofluidic control device in the prior art;
Fig. 3 is the structural representation of a kind of specific embodiment of the automatic retraction device of crane subsidiary arm provided by the present invention;
Fig. 4 is the local enlarged diagram at I position among Fig. 3;
Fig. 5 is the local enlarged diagram at II position among Fig. 3;
Fig. 6 is that the A of Fig. 3 rotates schematic diagram to the part;
Fig. 7 is the schematic perspective view of another angle of the automatic retraction device of crane subsidiary arm shown in Figure 3;
Fig. 8 is the local enlarged diagram at III position among Fig. 7.
Among Fig. 1, Fig. 2:
1 '. principal arm 1-1 '. support 2 '. auxiliary 3 '. bracket 4 '. 5. rotating shafts of bearing pin 1. electro-hydraulic drivers 2. auxiliarys 3. principal arms 4. auxiliary brackets
Among Fig. 3 to Fig. 8:
10. principal arm 11. basic arms 12. minor details arms 20. auxiliarys 30. brackets 40. supports 41. upper brackets 42. lower brackets 50. bearing pins 60. hydraulic rams 70. gears 80. tooth bars 90. axis of revolutions 101. top connections 102. lower adaptors 110. tooth bar supports 120. top shoes 130. sliding blocks 140. nuts 150. adjusting bolts 160. side slide blocks 170. clamp pins
The specific embodiment
Core of the present invention is to provide a kind of crane subsidiary arm automatic retraction device.This device can make auxiliary carry out large-scale automatic rotary in the subordinate phase of its whole turning course.Another core of the present invention provides a kind of hoisting crane with above-mentioned automatic retraction device.
In order to make those skilled in the art person understand better the present invention program, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
The term in expression orientation such as herein " upper and lower, left and right " is based on the position relationship of accompanying drawing, should not be understood as the absolute restriction to protection domain.
Please refer to Fig. 3, Fig. 4, Fig. 5, Fig. 3 is the structural representation of a kind of specific embodiment of the automatic retraction device of crane subsidiary arm provided by the present invention; Fig. 4 is the local enlarged diagram at I position among Fig. 3; Fig. 5 is the local enlarged diagram at II position among Fig. 3.
In a kind of specific embodiment, the automatic retractable application of installation of crane subsidiary arm provided by the invention is in the hoisting crane that is provided with auxiliary.
The principal arm 10 of this hoisting crane has five joint telescopic booms, for adapting to the requirement of in the engineering reality hoisting crane being hung greatly the width of cloth, high lifting altitude, have additional auxiliary 20 on its principal arm 10, as replenishing and development of principal arm 10, but work range and the lifting altitude of auxiliary 20 Effective Raise hoisting cranes.
Auxiliary 20 is comprised of two joint arms, one joint is box type construction for truss structure, a joint, connect by bearing pin between the two joint arms, the gross weight of whole auxiliary 20 surpasses 1.5t, auxiliary 20 is arranged in principal arm 10 right sides, and by bracket 30 supporting and locations, the afterbody of auxiliary 20 need to be hinged with the support 40 of principal arm 10 front ends during operation during withdrawal, for reaching this operating condition, auxiliary 20 need to turn round around axle.
The revolution of auxiliary 20 is divided into two stages, at F/s, auxiliary 20 is the less angle of revolution outwards, and the hinge of its afterbody next-door neighbour principal arm 10 1 sides is overlapped with the hinge on principal arm 10 front end right sides, then insert bearing pin 50, realize that principal arm 10 is connected with the part of auxiliary 20; In subordinate phase, auxiliary 20 continues revolution around the bearing pin 50 that inserts, until the hinge of its afterbody opposite side overlaps with the hinge in principal arm 10 front ends left side, at last, insert the opposite side bearing pin, realization principal arm 10 is connected fully with auxiliary 20 again, when regaining auxiliary 20, course of action is opposite.
As shown in the figure, the automatic retraction device of crane subsidiary arm mainly is made of parts such as hydraulic ram 60, gear 70, tooth bar 80 and axis of revolutions 90, wherein hydraulic ram 60 and tooth bar 80 are positioned at the right side of principal arm 10, be positioned at the same side of principal arm 10 with auxiliary 20, hydraulic ram 60 is fixed on the basic arm 11 of principal arm 10, and tooth bar 80 extends to minor details arm 12 along the length direction of principal arm 10 from basic arm 11 always.
As seen, therefore the length of tooth bar 80 and hydraulic ram 60 in the situation that structural condition allows, can be arranged on hydraulic ram 60 position near basic arm 11 front ends to the Range-based of minor details arm 12 right side hinges as far as possible.Like this, the length of tooth bar 80 is relatively short, helps to improve the stability of its transmission.
Please in the lump with reference to figure 7, Fig. 8, Fig. 7 is the schematic perspective view of another angle of the automatic retraction device of crane subsidiary arm shown in Figure 3; Fig. 8 is the local enlarged diagram at III position among Fig. 7.
The end that auxiliary 20 docks with principal arm 10 is provided with four joints, wherein be close to the pin-and-hole of the top connection 101 of principal arm 10 1 sides and lower adaptor 102 after auxiliary 20 rotating F/ss finish, just align with the upper bracket 41 on minor details arm 12 right sides and the pin-and-hole of lower bracket 42, after inserting bearing pin 50, auxiliary just begins to begin to carry out the revolution of subordinate phase take bearing pin 50 as center of gyration.
Gear 70 and axis of revolution 90 is coaxial fixing, and is fixed between top connection 101 and the lower adaptor 102 together with axis of revolution 90, and with upper and lower joint be the integral type structure, the hinged center of its axis and upper and lower joint coincides.
Tooth bar 80 is by tooth section and gear 70 engaged transmission of its front end, the rear end of tooth bar 80 is connected with the movable end of hydraulic ram 60, change straight-line motion into circular movement by hydraulic ram 60 by gear 70, tooth bar 80, drive auxiliarys 20 by axis of revolution 90 again and centered by axis of revolution 90, rotate.
Like this, when auxiliary 20 finishes the F/s revolution, and plug bearing pin 50 make auxiliary 20 and principal arm 10 local hinged after, primer fluid compressing cylinder 60 is done expanding-contracting action, just can pass through gear 70, tooth bar 80, drives auxiliary 20 and carries out large-scale automatic rotary (emit and regain) in the subordinate phase of its whole turning course, and need not manually to pull, compare with auxiliary revolution mode in the past, not only easy to operate, and more save manpower, time.
Its specific works process is as follows:
When connecting auxiliary 20, at first, auxiliary 20 is expanded to certain angle (can use manpower or power-assisted oil cylinder), inserting bearing pin 50 is hinged auxiliary 20 and principal arm 10, this moment, auxiliary 20 can be around the hinge revolution of principal arm 10 1 sides, primer fluid compressing cylinder 60 is also controlled its movable end and is retracted, be with simultaneously carry-over bar 80 to retract, tooth bar 80 driven gears 70 and axis of revolution 90 turning anticlockwises also make auxiliary 20 revolutions, when auxiliary 20 with after principal arm 10 docks, insert the opposite side bearing pin, finish being connected of auxiliary 20 and principal arm 10.
When regaining auxiliary 20, at first, remove the bearing pin of auxiliary 20 and principal arm 10 opposite sides, make its releasing hinged, this moment, auxiliary 20 can be around the hinge revolution of principal arm 10 1 sides, primer fluid compressing cylinder 60 is also controlled its movable end and is stretched out, be with simultaneously carry-over bar 80 to stretch out, tooth bar 80 driven gears 70 and the revolution of axis of revolution 90 cws also make auxiliary 20 revolutions, when auxiliary 20 is retracted to end position, remove its bearing pin that is connected with principal arm 50, at last auxiliary 20 is continued to return back to bracket 30.
The tooth section zone of tooth bar 80 only is positioned at its front end, concrete length is decided according to the stroke of auxiliary 20 second rotary phases, when auxiliary 20 is in the initial condition of the second rotary phase, the tooth section of its rear end is meshed with gear 70, when auxiliary 20 was in the end of a period state of the second rotary phase, the tooth section of its front end was meshed with gear 70.
Because tooth bar 80 is the elongate member of longer dimension, because of deadweight serious flexure deformation occurs for avoiding it, and then accurate engagement and the transmission of impact and gear 70.Here, can reach the side of respectively saving telescopic boom at the basic arm 11 of principal arm 10 some tooth bar supports 110 are set, prevent its deflection to support tooth bar 80, tooth bar support 110 is arranged with certain arranged with interval in principal arm 10 1 sides.
Please refer to Fig. 6, Fig. 6 is that the A of Fig. 3 rotates schematic diagram to the part.
Tooth bar support 110 is opening towards " U " of auxiliary shape, and pad is provided with top shoe 120 and sliding block 130 between the upper and lower contact surface of tooth bar 80 and tooth bar support 110, weares and teares with tooth bar support 110 in the process of moving back and forth to avoid tooth bar 80.These slide blocks can adopt the nylon material shape of laminating, and then cement on the upper and lower contact surface of tooth bar support 110, perhaps directly embed in the recess of upper and lower contact surface.
One of them support is provided with gear, tooth bar clearance adjustment mechanism.This clearance adjustment mechanism comprises the nut 140 that is fixed in internal stent and the adjusting bolt 150 that cooperates with nut thread, the head of adjusting bolt 150 is supported in the back side of tooth bar 80, rotate adjusting bolt 150 can make tooth bar 80 near or away from gear 70, thereby make gear 70 and tooth bar 80 engagements or disengaging, also can adjust the gap between gear 70 and the tooth bar 80, so that it is in proper states.
For avoiding tooth bar 80 and the head of adjusting bolt 150 to wear and tear, pad is provided with side slide block 160 between the head of the back side of tooth bar 80 and adjusting bolt 150, side slide block 160 can be fixed on tooth bar 80 back sides, also can be fixed on the head of adjusting bolt 150, perhaps remain in the tooth bar support with other form.
Certainly, except using adjusting bolt regulates, other version can also be adopted, the object of the invention can be realized equally, because mode in the cards is more, casehistory no longer one by one just here.
As what main points need to be stressed be, said gear 70 specifically can adopt helical wheel, and this helical gear axial force direction is opposite with gravity direction.Like this, the characteristics that can utilize the helical teeth wheel and rack to match can produce the lifting power opposite with gravity direction in the rotating while, the downwarp that produces because of deadweight to suppress auxiliary 20, avoid occurring assembly problem, the action of plug bearing pin can be carried out smoothly when making assembling.
Because axis of revolution 90 is connected as a single entity with top connection 101 and lower adaptor 102, and with the hinged center superposition of upper and lower joint, for avoiding affecting because of the existence of axis of revolution 90 the normal connection of bearing pin 50, axis of revolution 90 can be designed to hollow shaft, the hinge hole of its axis hole and upper and lower joint connects, take the bearing pin 50 of top connection 101 as example, bearing pin 50 can pass successively top connection 101 pin-and-hole, upper bracket 41 pin-and-hole and stretch in the axis hole of axis of revolution 90, then by the clamp pin 170 that crosses axis of revolution 90 that bearing pin 50 is fixing.If axis of revolution 90 is non-hollow shaft, then can offer at its two ends the axis hole of the certain distance that extends internally, in order to insert bearing pin 50.
The automatic retraction device of above-mentioned crane subsidiary arm only is a kind of preferred version, and its concrete structure is not limited to this, can make according to actual needs pointed adjustment on this basis, thereby obtains the automatic retraction device of different crane subsidiary arms.For example adopting electrical motor or HM Hydraulic Motor to drive tooth bar 80 as propulsion source moves back and forth etc.
Except the automatic retraction device of above-mentioned crane subsidiary arm, the present invention also provides a kind of hoisting crane, comprises crane main body, principal arm and auxiliary, and is provided with the automatic retraction device of above-described crane subsidiary arm, all the other structures please refer to prior art, and this paper repeats no more.
Above the automatic retraction device of crane subsidiary arm provided by the present invention and hoisting crane are described in detail.Used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand core concept of the present invention.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.

Claims (10)

1. the automatic retraction device of crane subsidiary arm is characterized in that, comprises hydraulic ram (60), gear (70), tooth bar (80) and axis of revolution (90); Described hydraulic ram (60) and tooth bar (80) are with a side of principal arm (10) next-door neighbour's auxiliary (20) of being located at described hoisting crane, and described gear (70) is coaxial fixing with axis of revolution (90); Described axis of revolution (90) is fixed between the upper and lower joint that described auxiliary (20) is close to described principal arm (10) one sides, and the axis of described axis of revolution (90) and the hinged center of described upper and lower joint coincide; One end of described tooth bar (80) is meshed with described gear (70), the other end is connected with the movable end of described hydraulic ram (60).
2. the automatic retraction device of crane subsidiary arm according to claim 1 is characterized in that, the side of described principal arm (10) is provided with the tooth bar support (110) of the described tooth bar of some supports.
3. the automatic retraction device of crane subsidiary arm according to claim 2 is characterized in that, described tooth bar support (110) is provided with gear, tooth bar clearance adjustment mechanism.
4. the automatic retraction device of crane subsidiary arm according to claim 3, it is characterized in that, described clearance adjustment mechanism comprises the nut (140) that is fixed in described tooth bar internal stent and the adjusting bolt (150) that cooperates with described nut thread, and the head of described adjusting bolt (150) is supported in the back side of described tooth bar (80).
5. the automatic retraction device of crane subsidiary arm according to claim 4, it is characterized in that, described tooth bar support (110) is opening towards " U " of described auxiliary (20) shape, and pad is provided with slide block between the contact surface of described tooth bar (80) and tooth bar support (110).
6. the automatic retraction device of crane subsidiary arm according to claim 5, it is characterized in that, described slide block comprises top shoe (120) and the sliding block (130) between the upper and lower contact surface that is positioned at described tooth bar (80) and tooth bar support (110), and is positioned at the side slide block (160) between described tooth bar (80) and the adjusting bolt (150).
7. according to claim 1 to the automatic retraction device of 6 each described crane subsidiary arms, it is characterized in that, described axis of revolution (90) is the integral type structure with upper and lower joint.
8. the automatic retraction device of crane subsidiary arm according to claim 7 is characterized in that, described hydraulic ram (60) is fixed in the basic arm (11) of described principal arm (10).
9. according to claim 1 to the automatic retraction device of 6 each described crane subsidiary arms, it is characterized in that, described gear (70) is helical wheel, and its axial force direction is opposite with gravity direction.
10. a hoisting crane comprises crane main body, principal arm and auxiliary, it is characterized in that, is provided with the automatic retraction device of the claims 1 to 9 each described crane subsidiary arm.
CN201110179441.9A 2011-06-29 2011-06-29 A kind of automatic retraction device of crane subsidiary arm and hoisting crane CN102849632B (en)

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CN201110179441.9A CN102849632B (en) 2011-06-29 2011-06-29 A kind of automatic retraction device of crane subsidiary arm and hoisting crane

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CN201110179441.9A CN102849632B (en) 2011-06-29 2011-06-29 A kind of automatic retraction device of crane subsidiary arm and hoisting crane

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CN102849632B CN102849632B (en) 2016-03-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103754776A (en) * 2013-12-31 2014-04-30 三一汽车起重机械有限公司 Fly jib self-dismounting mechanism, crane, and fly jib control method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1094733A (en) * 1964-08-03 1967-12-13 Greater Iowa Corp Mobile jib-cranes
US3907142A (en) * 1971-08-26 1975-09-23 Forrest D Welch Lifting attachment for a crane
EP0658509A1 (en) * 1993-11-18 1995-06-21 EFFER S.p.A. Supporting leg with a tipping mechanism for mobile cranes
CN2707726Y (en) * 2004-01-18 2005-07-06 上海三一科技有限公司 Mounting and fixing device for crane auxiliary arm

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1094733A (en) * 1964-08-03 1967-12-13 Greater Iowa Corp Mobile jib-cranes
US3907142A (en) * 1971-08-26 1975-09-23 Forrest D Welch Lifting attachment for a crane
EP0658509A1 (en) * 1993-11-18 1995-06-21 EFFER S.p.A. Supporting leg with a tipping mechanism for mobile cranes
CN2707726Y (en) * 2004-01-18 2005-07-06 上海三一科技有限公司 Mounting and fixing device for crane auxiliary arm

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103754776A (en) * 2013-12-31 2014-04-30 三一汽车起重机械有限公司 Fly jib self-dismounting mechanism, crane, and fly jib control method

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