CN202322132U - Crane and protection device for preventing backward tilting of arm support of crane - Google Patents

Crane and protection device for preventing backward tilting of arm support of crane Download PDF

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Publication number
CN202322132U
CN202322132U CN 201120497965 CN201120497965U CN202322132U CN 202322132 U CN202322132 U CN 202322132U CN 201120497965 CN201120497965 CN 201120497965 CN 201120497965 U CN201120497965 U CN 201120497965U CN 202322132 U CN202322132 U CN 202322132U
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CN
China
Prior art keywords
absorbing
jib
hypsokinesis
energy absorption
power
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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.)
Expired - Lifetime
Application number
CN 201120497965
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Chinese (zh)
Inventor
任会礼
曾维栋
尹莉
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Zoomlion Heavy Industry Science and Technology Co Ltd
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Zoomlion Heavy Industry Science and Technology Co Ltd
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Priority to CN 201120497965 priority Critical patent/CN202322132U/en
Application granted granted Critical
Publication of CN202322132U publication Critical patent/CN202322132U/en
Anticipated expiration legal-status Critical
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Abstract

A protection device for preventing backward tilting of an arm support comprises a guide sleeve, a buffering energy-absorbing device and a supporting rod, wherein the guide sleeve takes the shape of a hollow cylinder; the buffering energy-absorbing device is mounted in the guide sleeve, and comprises an energy-absorbing element which is deformed irreversibly after being compressed; one end of the supporting rod slidably extends into the guide sleeve and is butted with the buffering energy-absorbing device; the other end of the supporting rod is arranged outside the guide sleeve; and the area of the cross section of the energy-absorbing element in the sliding direction of the supporting rod is changeable. The protection device has the advantages that the structure is simple; and as the buffering energy-absorbing device, which is mounted in the guide sleeve and has a variable cross section area, is butted with the supporting rod, the rebound action born by the arm support when the crane unloads cargos suddenly is buffered and eliminated effectively, and energy and collision impact generated during the backward tilting collision process of the arm support of the crane are absorbed.

Description

Hoisting crane and jib thereof are prevented the hypsokinesis fender guard
Technical field
The utility model relates to a kind of safety guard, relates in particular to a kind of vibration that produces during from the jib hypsokinesis in order to buffering and anti-hypsokinesis fender guard of jib of impact that is applied on the crane arm support.
Background technology
Because the elastic reaction of changing-breadth system and complete machine, the hypsokinesis accident very easily takes place under the unexpected discharged situation in hoisting crane in lifting goods process.Therefore, need consider the operating mode that this is special during the hoisting crane general design, for the jib of hoisting crane is provided with the anti-hypsokinesis fender guard of a kind of jib.
See also Chinese patent No. 200920067315.2, the content that this piece patent is disclosed is also incorporated the utility model into as disclosing reference at this.This piece patent relates to the anti-hypsokinesis safety guard of a kind of mechanical spring formula, between the principal arm of its main platform that is arranged at hoisting crane and jib, and the vibration and the impact that produce when cushioning the principal arm hypsokinesis from jib.This principal arm is provided with chute, and an end of chute is provided with a jacking block.The anti-hypsokinesis safety guard of said mechanical spring formula comprises strut bar, outer tube and interior pipe.Strut bar one end and main platform are connected through the hinge, and are arranged with spring on it.Outer tube sleeve is located on the strut bar and with spring and is leant.In pipe be inserted in the outer tube, an end of interior pipe and outer tube are connected through bearing pin to be fixed, the other end of interior pipe is free end and the jacking block in the chute.
Hoisting crane leans forward and when reaching certain angle, this mechanical spring formula anti-squat system leans forward thereupon, and does not have mutual action between the jib when the principal arm of the jib of this hoisting crane hoists when lifting cargo.When the jib hypsokinesis of hoisting crane, the free end of interior pipe places in the chute and along chute and slides until holding out against jacking block; Simultaneously, outer tube begins compression spring, when principal arm reaches maximum permission angle; Length of spring compressed is to the greatest limit position; Buffering is from the impact of jib hypsokinesis and play the effect of mechanical position limitation, thereby has prevented that principal arm from receding, and has improved the security and stability of principal arm when operation.
But, in the anti-hypsokinesis safety guard use of said mechanical spring formula, owing to absorb the inertia potential energy of jib behind the spring pressurized, thus make jib have bigger rebound effect, jib stability is had considerable influence.
The utility model content
In view of this, be necessary to provide a kind of and can effectively eliminate rebound effect, and can effectively cushion the anti-hypsokinesis fender guard of the jib that impacts from the jib hypsokinesis jib.
In view of this, also be necessary to provide a kind of hoisting crane with the anti-hypsokinesis fender guard of above-mentioned jib.
The utility model provides a kind of jib to prevent the hypsokinesis fender guard; Comprise pilot sleeve, crash energy absorption equipment, reach strut bar; Said pilot sleeve is hollow tube-shape; Said crash energy absorption equipment is installed in the said pilot sleeve, and said crash energy absorption equipment comprises the power-absorbing that irreversible transformation can take place behind the pressurized, an end of said strut bar stretch into slidably in the said pilot sleeve and with said crash energy absorption equipment butt; The other end of said strut bar is positioned at outside the said pilot sleeve, and said power-absorbing changes along the area of the cross-sectional plane of strut bar direction of slip.
As the further improvement of the utility model, the shaft section of said power-absorbing is echelon form or stepped.
As the further improvement of the utility model, said power-absorbing is a hollow energy-absorbing tube.
As the further improvement of the utility model, as the further improvement of the utility model, the cross-sectional plane of said power-absorbing is circular, square or polygon.
As the further improvement of the utility model, the barrel of said power-absorbing is a double-decker.
As the further improvement of the utility model, the cross-sectional plane of said power-absorbing is a square honeycombed in hexagon in the foreign side, square-outside and round-inside shape, square-outside and round-inside honeycombed, cylindrical interior circle honeycombed or the foreign side.
As the further improvement of the utility model, said crash energy absorption equipment also comprises the two cover plates that is fixedly arranged on said power-absorbing two ends respectively relatively, and the outside face away from said power-absorbing on every cover plate is concaved with a dashpot.
As the further improvement of the utility model, the number of said crash energy absorption equipment is two, is installed in the said pilot sleeve along series connection on the axial direction of pilot sleeve, and is connected to together each other.
Further improvement as the utility model; The volume of one of them crash energy absorption equipment is big than the volume of another crash energy absorption equipment in said two crash energy absorption equipments, and said pilot sleeve is used to install the position of said two crash energy absorption equipments and is arranged to the ladder bushing form.
The utility model provides a kind of hoisting crane with the anti-hypsokinesis fender guard of above-mentioned jib in addition, and the anti-hypsokinesis fender guard of said jib is connected between turntable and the principal arm frame of hoisting crane or is connected between the principal arm frame and secondary arm frame of hoisting crane.
As further improvement of the present invention; The anti-hypsokinesis fender guard of said jib also comprises through bearing pin and is installed in the roller on the strut bar; The principal arm frame of hoisting crane or secondary arm frame are provided with the slideway that supplies roller to slide, and said roller is installed on the strut bar end away from pilot sleeve.
The beneficial effect of the utility model is; The anti-hypsokinesis fender guard of said jib is simple in structure; It has variable cross-section long-pending crash energy absorption equipment and strut bar butt through being installed in pilot sleeve; The rebound effect that its jib received when effectively buffering and elimination were to the unexpected unloaded of cargo of hoisting crane absorbs the energy and the collision impact that produce in the crane arm support hypsokinesis collision process, avoids crane arm support is caused damage.Compare with traditional mechanical spring formula anti-squat system, the collision energy that when the anti-hypsokinesis fender guard of said jib has absorbed the crane arm support hypsokinesis through its crash energy absorption equipment strut bar has been produced has been avoided the bounce-back of crane arm support, has reduced potential safety hazard.
Above-mentioned explanation only is the general introduction of the utility model technical scheme; In order more to know the technological means of understanding the utility model; And can implement according to the content of specification sheets, and for let the above-mentioned of the utility model with other purposes, feature and advantage can be more obviously understandable, below special act preferred embodiment; And conjunction with figs., specify as follows.
Description of drawings
Fig. 1 is the structural representation of the anti-hypsokinesis fender guard preferred embodiment of the utility model jib.
Fig. 2 is the shaft section figure of first embodiment of crash energy absorption equipment in the utility model.
Fig. 3 is the shaft section figure of second embodiment of crash energy absorption equipment in the utility model.
Fig. 4 is the shaft section figure of the 3rd embodiment of crash energy absorption equipment in the utility model.
Fig. 5 is the shaft section figure of the 4th embodiment of crash energy absorption equipment in the utility model.
Fig. 6 to Figure 14 is the cross sectional representation of the energy-absorbing tube of crash energy absorption equipment in the utility model.
The specific embodiment
For further setting forth the utility model is to reach technological means and the effect that predetermined utility model purpose is taked; Below in conjunction with accompanying drawing and preferred embodiment; To the specific embodiment, structure, characteristic and the effect thereof of the anti-hypsokinesis fender guard of jib that proposes according to the utility model, specify as after.
See also Fig. 1, be the structural representation of anti-hypsokinesis fender guard 100 first embodiment of the utility model jib.The anti-hypsokinesis fender guard 100 of this jib is applied on the hoisting crane; Its two ends are articulated between turntable and the principal arm frame of hoisting crane respectively or between the principal arm frame and secondary arm frame of hoisting crane, in lifting goods process, under the unexpected discharged situation hypsokinesis accident take place in order to prevent hoisting crane.The anti-hypsokinesis fender guard 100 of said jib comprises pilot sleeve 20, at least one crash energy absorption equipment 40, strut bar 60, reaches roller 80.
Said pilot sleeve 20 is hollow tube-shape, comprise closed end 21 and with these closed end 21 opposing open end 25.The closed end 21 of said pilot sleeve 20 outwards is convexly equipped with and forms an articulated joint 23, in order to this pilot sleeve 20 is hinged through the turntable or the principal arm frame of bearing pin and hoisting crane.
Said at least one crash energy absorption equipment 40 is installed in the pilot sleeve 20; One end of this crash energy absorption equipment 40 is held in the closed end 21 in this pilot sleeve 20; The other end and said strut bar 60 butts, the impulsive force that produces in the jib hypsokinesis process in order to collision impact in the jib hypsokinesis process of buffer crane and absorption hoisting crane.The quantity of said crash energy absorption equipment 40 can be one or more; In the present embodiment; The number of said crash energy absorption equipment 40 is two, is respectively crash energy absorption equipment 40a and crash energy absorption equipment 40b, and said two crash energy absorption equipment 40a, 40b are installed in this pilot sleeve 20 along the axial direction series connection of pilot sleeve 20; And be connected to each other together, in order to increase buffer distance.
Please consult Fig. 2 in the lump, be the shaft section figure of 40 first embodiment of crash energy absorption equipment in the utility model.This crash energy absorption equipment 40 is formed by a power-absorbing 41 and two cover plates 43 that are fixedly arranged on these power-absorbing 41 two ends respectively relatively.Said power-absorbing 41 can be and bursts formula or conquassation formula power-absorbing.Wherein, Mainly the friction between square or circular sleeve comes the absorbing impact energy with the irreversible transformation that outer bulging deformation takes place until breaking through two to burst the formula power-absorbing; It is simple in structure, and is bigger than energy-absorbing, can be used for the jib anti-squat system of medium and small tonnage hoisting crane.Conquassation formula power-absorbing then mainly utilizes the irreversible transformations such as conquassation generation plasticity of metal or non-metal thin-wall construction to absorb energy, and its conquassation distortion is stable, and the conquassation counter-force is steady, can be used for the jib anti-squat system than hoister in large tonnage.In the present embodiment, along the area change of the cross-sectional plane of this power-absorbing 41 on the direction of slip of strut bar 60, it is long-pending to have variable cross-section; The barrel of power-absorbing 41 is that shaft section for example is trapezoidal hollow energy-absorbing tube, irreversible transformations such as plasticity can take place behind pressurized, and the barrel of this power-absorbing 41 is a double-decker; This power-absorbing 41 is because the shaft section of barrel is trapezoidal; Axial stiffness constantly changes, and it is less initially to clash into moment impact peak value, and impact is milder.This two cover plates 43 is welded in the two ends of power-absorbing 41, and in order to effective transmitted load, the outside face of every cover plate 43 middle part is arranged with and forms a dashpot 435.
Among Fig. 1; The volume of crash energy absorption equipment 40a is big than the volume of crash energy absorption equipment 40b; Pilot sleeve 20 is used to install the position of two crash energy absorption equipment 40a, 40b and is arranged to the ladder bushing form, and two crash energy absorption equipment 40a, 40b can be installed in the pilot sleeve 20 appositely.
One end of said strut bar 60 stretches into slidably in the pilot sleeve 20 and with crash energy absorption equipment 40 and is connected to; The other end of this strut bar 60 is positioned at outside the pilot sleeve 20, and contiguous these roller 80 positions convex with a projection 65 on the end of this strut bar 60.In addition, the principal arm frame or the auxiliary of hoisting crane are provided with slideway 70, and the top of slideway 70 is provided with jacking block 71, and in the present embodiment, the cross-sectional plane of this slideway 70 is roughly U-shaped.
Said roller 80 is installed on this strut bar 60 end away from pilot sleeve 20 through bearing pin; Roller 80 is arranged in the slideway 70 and can in said slideway 70, rolls, and strut bar 60 is movably connected on through the principal arm frame or the secondary arm frame of roller 80 with hoisting crane.
When the unexpected unloaded of cargo of hoisting crane, along with the jib hypsokinesis gradually of hoisting crane, said roller 80 withstands along the jacking block 71 that 70 rollings of U-shaped slideway are provided with on projection on the strut bar 60 65 and jib.At this moment; Said strut bar 60 slides and compresses this in lower edge, top pilot sleeve 20 is tried hard to recommend in the hypsokinesis of crane arm support and is installed in the crash energy absorption equipment 40 in the pilot sleeve 20; Irreversible transformations such as plasticity take place in the power-absorbing 41 supported bars 60 compression backs of this crash energy absorption equipment 40; With energy, the mitigation collision impact that produces in the absorption crane arm support hypsokinesis collision process, thereby stop crane arm support to be tumbled backward.When power-absorbing 41 was extruded into incompressible state, strut bar 60 can be conflicted with the closed end 21 of pilot sleeve 30, tumbled backward with the form prevention crane arm support of mechanical position limitation.The anti-hypsokinesis fender guard 100 of said jib is through the ladder bushing setting; Adopt multilevel stiffness changing energy-absorbing tube to arrange, each energy-absorbing tube is with this conquassation distortion step by step, and the energy-absorbing tube (crash energy absorption equipment 40b) that rigidity is less is because initial conquassation power is less; The distortion of conquassation at first absorbing impact kinetic energy; Help reducing initial collision moment impact peak value, the energy-absorbing tube that rigidity is bigger (crash energy absorption equipment 40a) is follow-up progressively to get into the conquassation state again, thereby subdues jib hypsokinesis vibration preferably.Because the shaft section of barrel is trapezoidal, axial stiffness constantly changes, and it is less initially to clash into moment impact peak value; Impact is milder, and through being arranged to many array configurations, but the energization absorptivity; Can not take excessive space after the distortion; Help reducing the energy absorption device deadweight, and simple in structure, be easy to make.
Factors such as the collision energy-absorbing ability of the power-absorbing 41 of said crash energy absorption equipment 40 and material, cross sectional shape, wall thickness are closely related; The installation position and the strut bar 60 that are chosen at assurance crash energy absorption equipment 40 of the material of power-absorbing 41 can bear under the prerequisite of maximum impact force; Select the bigger metal of rigidity, non-metal and composite material etc., to absorb energy as much as possible as far as possible.
See also Fig. 3, be the shaft section figure of 402 second embodiment of crash energy absorption equipment in the utility model.In the present embodiment; The structural similitude of the crash energy absorption equipment 40 of the structure of crash energy absorption equipment 402 and first embodiment; Its difference is; It is long-pending that the power-absorbing 412 of this crash energy absorption equipment 402 has variable cross-section, and the shaft section of the barrel of power-absorbing 413 is stepped, and barrel is the energy-absorbing tube of hollow double-layer structure.The shaft section of barrel is stepped, and cushion effect is steady, and plastic deformation absorbs the energy of impact in the dependence hole enlargement deformation process, and energy-absorbing efficient is high.
See also Fig. 4, be the shaft section figure of the 3rd embodiment of crash energy absorption equipment 403 in the utility model.In the present embodiment; The structural similitude of the crash energy absorption equipment 40 of the structure of crash energy absorption equipment 403 and first embodiment; Its difference is; It is long-pending that the power-absorbing 413 of this crash energy absorption equipment 403 has variable cross-section, and the shaft section of the barrel of power-absorbing 413 is for being the isosceles trapezoid shape, and barrel is the energy-absorbing tube of hollow single layer structure.
See also Fig. 5, be the shaft section figure of the 4th embodiment of crash energy absorption equipment 404 in the utility model.In the present embodiment; The structural similitude of the crash energy absorption equipment 402 of the structure of crash energy absorption equipment 404 and first embodiment; Its difference is; It is long-pending that the power-absorbing 414 of this crash energy absorption equipment 404 has variable cross-section, and the shaft section of the barrel of power-absorbing 414 is stepped, and barrel is the energy-absorbing tube of hollow single layer structure.
According to above-mentioned, it is long-pending that power-absorbing can have variable cross-section, and for example the shaft section of the barrel of power-absorbing can be set to trapezoidal and stepped appearance, so that the barrel version of power-absorbing is for becoming the rigidity type.
The version of energy-absorbing tube also can be divided into individual layer barrel structure and multilayer barrel structure according to cross-sectional plane; Please consult Fig. 6 to Figure 14 in the lump, be the adoptable cross-sectional structure scheme drawing of barrel of power-absorbing (for example above-mentioned power-absorbing 41,412,413,414).Wherein Fig. 6 to Fig. 8 is an individual layer barrel structure, particularly, can be circular individual layer barrel structure shown in Figure 6, square individual layer barrel structure shown in Figure 7, polygon individual layer barrel structure shown in Figure 8; Fig. 9 to Figure 14 is a multilayer barrel structure; Particularly, can be in the double-deck honeycomb barrel structure of circle in hexagon two layered cylinder wall construction in square-outside and round-inside two layered cylinder wall construction shown in Figure 9, Figure 10 and the double-deck honeycomb barrel of square-outside and round-inside structure shown in Figure 11, the foreign side shown in Figure 12, the cylindrical shown in Figure 13, the foreign side shown in Figure 14 just double-deck honeycomb barrel structure etc.
The anti-hypsokinesis fender guard 100 of said jib is simple in structure; It is through being installed in the crash energy absorption equipment 40 (402,403,404) and strut bar 60 butts in the pilot sleeve 20; The rebound effect that its jib received when effectively buffering and elimination were to the unexpected unloaded of cargo of hoisting crane; Absorb the energy and the collision impact that produce in the crane arm support hypsokinesis collision process, avoid crane arm support is caused damage and reduces potential safety hazard.Compare with traditional mechanical spring formula jib anti-squat system; When the anti-hypsokinesis fender guard 100 of said jib has absorbed the jib hypsokinesis of hoisting crane through its crash energy absorption equipment 40 (402,403,404) to the most collision energy of strut bar 60 generations; Avoid the bounce-back and the sustain damage of crane arm support, reduced potential safety hazard to greatest extent.
Comprehensively above-mentioned; The power-absorbing of crash energy absorption equipment can be designed as multiple version, after external impact force reaches conquassation triggering power, and irreversible transformations such as power-absorbing generation plasticity; With the irreversible deformation energy that converts into of impact kinetic energy; Thereby the absorption lot of energy, effectively eliminate collision impact, stop jib to retreat and turn over; Compare with the anti-hypsokinesis safety guard of mechanical spring formula,, therefore jib is not had rebound effect, can avoid jib undermined because the collapse energy-absorption device has absorbed most of collision energy; According to anti-hypsokinesis design-calculated needs, crash energy absorption equipment can be designed as the multilevel stiffness changing form, to relax the collision impact in the jib hypsokinesis process more effectively.
The above; It only is the preferred embodiment of the utility model; Not being that the utility model is done any pro forma restriction, though the utility model with the preferred embodiment exposure as above, yet is not in order to limit the utility model; Anyly be familiar with the professional and technical personnel; In not breaking away from the utility model technical scheme scope, make a little change or be modified to the equivalent embodiment of equivalent variations when the technology contents of above-mentioned announcement capable of using, be not break away from the utility model technical scheme content in every case;, all still belong in the scope of the utility model technical scheme any simple modification, equivalent variations and modification that above embodiment did according to the technical spirit of the utility model.

Claims (12)

1. a jib is prevented the hypsokinesis fender guard; It is characterized in that: comprise pilot sleeve, crash energy absorption equipment, reach strut bar; Said pilot sleeve is hollow tube-shape; Said crash energy absorption equipment is installed in the said pilot sleeve, and said crash energy absorption equipment comprises the power-absorbing that irreversible transformation can take place behind the pressurized, an end of said strut bar stretch into slidably in the said pilot sleeve and with said crash energy absorption equipment butt; The other end of said strut bar is positioned at outside the said pilot sleeve, and said power-absorbing changes along the area of the cross-sectional plane of strut bar direction of slip.
2. jib according to claim 1 is prevented the hypsokinesis fender guard, and it is characterized in that: the shaft section of said power-absorbing is echelon form or stepped.
3. jib according to claim 1 is prevented the hypsokinesis fender guard, it is characterized in that: said power-absorbing is a hollow energy-absorbing tube.
4. jib according to claim 3 is prevented the hypsokinesis fender guard, it is characterized in that: the barrel of said power-absorbing is a single layer structure.
5. jib according to claim 4 is prevented the hypsokinesis fender guard, and it is characterized in that: the cross-sectional plane of said power-absorbing is circular, square or polygon.
6. jib according to claim 3 is prevented the hypsokinesis fender guard, it is characterized in that: the barrel of said power-absorbing is a double-decker.
7. jib according to claim 6 is prevented the hypsokinesis fender guard, it is characterized in that: the cross-sectional plane of said power-absorbing is a square honeycombed in hexagon in the foreign side, square-outside and round-inside shape, square-outside and round-inside honeycombed, cylindrical interior circle honeycombed or the foreign side.
8. jib according to claim 3 is prevented the hypsokinesis fender guard; It is characterized in that: said crash energy absorption equipment also comprises the two cover plates that is fixedly arranged on said power-absorbing two ends respectively relatively, and the outside face away from said power-absorbing on every cover plate is concaved with a dashpot.
9. jib according to claim 3 is prevented the hypsokinesis fender guard, it is characterized in that: the number of said crash energy absorption equipment is two, is installed in the said pilot sleeve along series connection on the axial direction of pilot sleeve, and is connected to together each other.
10. jib according to claim 9 is prevented the hypsokinesis fender guard; It is characterized in that: the volume of one of them crash energy absorption equipment is big than the volume of another crash energy absorption equipment in said two crash energy absorption equipments, and said pilot sleeve is used to install the position of said two crash energy absorption equipments and is arranged to the ladder bushing form.
11. the hoisting crane with the anti-hypsokinesis fender guard of each described jib of claim 1 to 10 is characterized in that: the anti-hypsokinesis fender guard of said jib is connected between turntable and the principal arm frame of hoisting crane or is connected between the principal arm frame and secondary arm frame of hoisting crane.
12. hoisting crane according to claim 11; It is characterized in that: the anti-hypsokinesis fender guard of said jib also comprises through bearing pin and is installed in the roller on the strut bar; The principal arm frame of hoisting crane or secondary arm frame are provided with the slideway that supplies roller to slide, and said roller is installed on the strut bar end away from pilot sleeve.
CN 201120497965 2011-12-05 2011-12-05 Crane and protection device for preventing backward tilting of arm support of crane Expired - Lifetime CN202322132U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201120497965 CN202322132U (en) 2011-12-05 2011-12-05 Crane and protection device for preventing backward tilting of arm support of crane

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Application Number Priority Date Filing Date Title
CN 201120497965 CN202322132U (en) 2011-12-05 2011-12-05 Crane and protection device for preventing backward tilting of arm support of crane

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106703002A (en) * 2015-07-23 2017-05-24 徐工集团工程机械股份有限公司 Anti-back-tipping structural piece, anti-back-tipping device and engineering machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106703002A (en) * 2015-07-23 2017-05-24 徐工集团工程机械股份有限公司 Anti-back-tipping structural piece, anti-back-tipping device and engineering machine

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Granted publication date: 20120711