CN201785176U - High-altitude operation device and leveling mechanism and high-altitude operation car of high-altitude operation device - Google Patents

High-altitude operation device and leveling mechanism and high-altitude operation car of high-altitude operation device Download PDF

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Publication number
CN201785176U
CN201785176U CN2010202868143U CN201020286814U CN201785176U CN 201785176 U CN201785176 U CN 201785176U CN 2010202868143 U CN2010202868143 U CN 2010202868143U CN 201020286814 U CN201020286814 U CN 201020286814U CN 201785176 U CN201785176 U CN 201785176U
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China
Prior art keywords
rod
oil cylinder
point
piston
hinge
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Expired - Fee Related
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CN2010202868143U
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Chinese (zh)
Inventor
董元俊
陈应杰
廖荣华
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Sany Group Co Ltd
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Sany Group Co Ltd
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Priority to CN2010202868143U priority Critical patent/CN201785176U/en
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Expired - Fee Related legal-status Critical Current

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Abstract

The utility model provides a high-altitude operation device and a leveling mechanism and a high-altitude operation car of the high-altitude operation device. The leveling mechanism comprises a rotary table, an arm support, a fluctuating oil cylinder, a work platform, a first connecting rod, a second connecting rod, a first double-rod oil cylinder and a second double-rod oil cylinder. A parallelogram is formed by a hinged point A of the rotary table with the arm support, a hinged point B of the first connecting rod with the rotary table, a hinged point C of the first connecting rod with the second connecting rod and a hinged point D of the second connecting rod with the arm support; a cylinder body of the first double-rod oil cylinder is hinged with the arm support; a hinged point E is arranged on the cylinder body hinged with the arm support; a piston rod of the first double-rod oil cylinder is hinged to the hinged point C; a triangle DEC is formed by the hinged points D, E and C; a triangle D'E'C' is formed by a hinged point D' of the arm support with the work platform, a hinged point E' of the second double-rod oil cylinder with the arm support and a hinged point C' of the second double-rod oil cylinder with the work platform; the triangle DEC is identically equal to the triangle D'E'C'; an edge ED is equal to an edge E'D'; an edge DC is parallel and equal to an edge D'C'; and an edge EC is parallel and equal to an edge E'C'.

Description

Aerial lift device and levelling gear thereof and aerial platform
Technical field
The utility model relates to a kind of aerial lift device and levelling gear and aerial platform.
Background technology
All are similar to the engineering equipment of aerial platform, and the demand that its upper side sub-agencies need the maintenance level that relates to is all arranged.With the aerial platform is example, and the people stands in the work basket of equipment, not only needs the assurance personnel basket of working when aloft work to want level, be static level this moment, require also to guarantee when the telescopic boom of equipment is taken exercises that the work basket must keep dynamic level, to guarantee personnel's safety.Use the principle of leveling to have following several at present:
(1) levelling gear that utilizes people's basket to conduct oneself with dignity.In any case utilize the action of gravity of work basket and load to make the lifting of work basket can both keep horizontality automatically.This leveling structure has advantage simple in structure, in light weight, that adjustment is easy to maintenance, cost is low, but shortcoming is the work basket easily rocks, particularly when operating personal during in the shift in position of work in the basket, the work basket produces and shakes, make operating personal that unsafe sensation be arranged, need to take catch gear, troublesome poeration after arriving a control position.
(2) parallel four connecting rod levelling gears.Referring to Fig. 1, adopt two kinds of parallelogram connection-rod structures among the figure, with rotary table 1 " the bonded assembly first parallelogram connection-rod structure 21 " and with the first parallelogram connection-rod structure 21 " the bonded assembly second parallelogram connection-rod structure 22 ", workplatform 3 " side be fixed on the vertical portion of the second parallelogram connection-rod structure; utilize parallelogram two groups of opposite side principle of keeping parallelism respectively all the time in deformation process; no matter how lifting of folding arm or extending arm, workplatform remains horizontality.But the shortcoming of said structure is a parallel four-bar linkage can only arrange in the jib outside, and is not suitable for telescopic big arm, makes the complex structure of whole aerial platform.
(3) chain sprocket formula levelling gear.Chain sprocket formula levelling gear is developed by parallel four connecting rod levelling gears, and the scope that angle can change is bigger, but also has baroque shortcoming, is not suitable for telescopic big arm equally.
(4) hydrostatic levelling gear.Referring to Fig. 2, be provided with oil cylinder 12 ' between rotary table 1 ' and the jib 2 ', be provided with oil cylinder 23 ' between jib 2 ' and the workplatform 3 '.The hinge-point A of oil cylinder 12 ' and rotary table 1 ' forms triangle ABC with the hinge-point C of jib 2 ' and the hinge-point B of jib 2 ' and rotary table 1 '.The hinge-point A ' of oil cylinder 23 ' and jib, with the hinge-point C ' of work basket, and the hinge-point B ' of oil cylinder 23 ' and jib, form triangle A ' B ' C '.The rod chamber of oil cylinder 12 ' and the rod chamber of oil cylinder 23 ' communicate, the rodless cavity of oil cylinder 12 ' and the rodless cavity of oil cylinder 23 ' communicate, the certain distance of oil cylinder 12 ' motion, the identical distance of oil cylinder 23 ' motion simultaneously, triangle ABC is approximate identical with triangle A ' B ' C ', realizes the level of work basket, there is following problem in this leveling mode, can not guarantee the complete level of work basket in theory, can only realize the level that is similar to realizing that promptly the precision of level is not high enough.
(5) electric liquid levelling gear.The basic functional principle of electricity liquid leveling is by being installed in the state that horizon sensor on the workplatform comes aware platform, and produce a corresponding electric current, the action of control leveling hydraulic actuating cylinder, finally make platform maintenance level, this leveling mode physical construction is fairly simple, but higher to electric system and Hydraulic Elements performance demands, the cost height, unreliable.And leveling is discontinuous, has and rocks, and the personnel that are in the work basket are caused sense of insecurity.
The utility model content
The utility model aim to provide a kind of simple in structure, reliable, precision is high, applied widely, the aerial lift device and levelling gear and the aerial platform that have more the sense of security.
According to an aspect of the present utility model, a kind of levelling gear of aerial lift device is provided, comprising: rotary table, jib, fluctuating oil cylinder and workplatform also comprise: first connecting rod, one end and rotary table are hinged; Second connecting rod, one end and jib are hinged, and the other end of the other end and first connecting rod is hinged; The hinge-point D of hinge-point C, second connecting rod and the jib of hinge-point B, first connecting rod and the second connecting rod of hinge-point A, first connecting rod and the rotary table of rotary table and jib forms parallelogram ABCD; First pair of rod oil cylinder, its cylinder body portion and jib are hinged, and hinge-point is E, and an one piston rod is articulated on the hinge-point C; Hinge-point D, hinge-point E and hinge-point C form first and adjust triangle DEC; Second pair of rod oil cylinder, its cylinder body portion and jib are hinged, and an one piston rod and workplatform are hinged; The hinge-point C ' of the hinge-point E ' of the hinge-point D ' of jib and workplatform, the second pair of rod oil cylinder and jib, the second pair of rod oil cylinder and workplatform forms second and adjusts triangle D ' E ' C '; It is congruent triangles that the first adjustment triangle DEC and second adjusts triangle D ' E ' C ', and wherein, the ED limit equates that with E ' D ' limit the DC limit is parallel and equal with D ' C ' limit, and the EC limit is parallel and equal with E ' C ' limit.
Further, first pair of rod oil cylinder comprises: the first cylinder body portion; First piston is arranged in the first cylinder body portion; The first piston bar and second piston rod that are separately positioned on the first piston two ends and pass from the first cylinder body portion two ends; The first piston bar is identical with second diameter of piston rod, and the first piston bar is articulated on the hinge-point C; First piston is the second cavity portion that is provided with the first cavity portion of first piston bar and is provided with second piston rod with first cylinder part; Second pair of rod oil cylinder, identical with first pair of rod oil cylinder structure, it comprises: the second cylinder body portion; Second piston; The 3rd piston rod and the 4th piston rod, wherein, the 3rd piston rod and workplatform are hinged; Second piston is the 4th cavity portion that is provided with the 3rd cavity portion of the 3rd piston rod and is provided with the 4th piston rod with second cylinder part; The hydraulic fluid port of the first cavity portion communicates with the hydraulic fluid port of the 4th cavity portion, and the hydraulic fluid port of the second cavity portion communicates with the hydraulic fluid port of the 3rd cavity portion.
Further, jib is the single-unit arm.
Further, jib is a multi-stage telescopic arms.
Further, the cylinder body portion and the rotary table of fluctuating oil cylinder are hinged, and the piston rod and the jib of fluctuating oil cylinder are hinged.
According to another aspect of the present utility model, a kind of aerial lift device also is provided, comprise the levelling gear of foregoing aerial lift device.
According to another aspect of the present utility model, a kind of aerial platform also is provided, comprise foregoing aerial lift device.
According to the technical solution of the utility model, owing to utilized two relative limits of parallelogram ABCD to remain parallel characteristics, the DC limit remains parallel with the AB limit, it is congruent triangles that the first adjustment triangle DEC and second adjusts triangle D ' E ' C ', and the ED limit equates with E ' D ' limit, the DC limit is parallel and equal with D ' C ' limit, the EC limit is parallel and equal with E ' C ' limit, like this, by controlling first hydraulic ram and the equal collapsing length of second hydraulic ram, can make the first adjustment triangle DEC and second adjust triangle D ' E ' C ' and remain congruence, and then it is parallel that D ' C ' is remained, thereby make bench board when the jib rise and fall, also remain the mode of operation of level, overcome the complex structure of the levelling gear existence of prior art, the cost height, range of use is little, leveling is discontinuous, and the problem that the leveling precision is not high, and then provide a kind of simple in structure, operation, the leveling process is reliable continuously, the precision height, applied widely, have more the levelling gear of the sense of security.
Description of drawings
Constitute this specification sheets a part, be used for further understanding accompanying drawing of the present utility model and show preferred embodiment of the present utility model, and be used for illustrating principle of the present utility model with specification sheets.Among the figure:
Fig. 1 has schematically shown a kind of leveling structure of prior art;
Fig. 2 has schematically shown the another kind of leveling structure of prior art;
Fig. 3 shows the schematic construction according to a kind of leveling structure of the present utility model;
Fig. 4 shows the schematic construction of first pair of rod oil cylinder in the utility model;
Fig. 5 shows the schematic construction of second pair of rod oil cylinder in the utility model.
The specific embodiment
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the utility model below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
The schematic construction of the levelling gear of a kind of aerial lift device that provides according to the utility model is provided Fig. 3, as shown in the figure, this leveling structure comprises the parallelogram adjusting mechanism that is positioned at the diagram below, is positioned at the triangle adjusting mechanism and the brace fluctuating device 8 of diagram top.
Referring to Fig. 3, above-mentioned parallelogram adjusting mechanism comprises: rotary table 1; First section 21 of jib 2, one end and rotary table 1 are hinged, and hinge-point is A; First connecting rod 4, one end and rotary table 1 are hinged, and hinge-point is B; Second connecting rod 5, one end and jib first section 21 is hinged, and hinge-point is D, and its other end is articulated in the other end of first connecting rod 4, and hinge-point is C; First connecting rod 4 is parallel to first section 21 of jib, and second connecting rod 5 is parallel with rotary table 1.As can be seen from Figure, each hinge-point between first of rotary table 1, jib section 21, first connecting rod 4 and the second connecting rod 5 links to each other successively and forms parallelogram ABCD.
This parallelogram adjusting mechanism also comprises first pair of rod oil cylinder 3, referring to Fig. 4, schematically shown the structure of first pair of rod oil cylinder, this first pair of rod oil cylinder 3 comprises: the first cylinder body portion 30, be arranged on the first cylinder body portion, 30 in-to-in first pistons 33, be positioned at first piston 33 two ends and the first piston bar 31 and second piston rod 32 that pass from the first cylinder body portion, 30 two ends respectively, and first piston bar 31 and second piston rod 32 has same diameter.First piston 33 is divided into first cavity portion 35 that is provided with first piston bar 31 and the second cavity portion 36 with second piston rod 32 with the first cylinder body portion 30.In conjunction with reference to figure 3, as can be seen, the first cylinder body portion 30 of first pair of rod oil cylinder is articulated on first section 21 of jib, and hinge-point is E; First piston bar 31 is articulated on the hinge-point C.
The triangle adjusting mechanism comprises: second section 22 of jib, first section 21 of one end and jib is connected, and is positioned on first section 21 the extended line of jib.Second section 22 of jib and first section 21 of jib can be that integrative-structure also can be a split-type structural.Bench board 7, one end are articulated in second section 22 outer end of jib, and hinge-point is D '.
Second pair of rod oil cylinder 6 referring to Fig. 5, schematically shown the structure of second pair of rod oil cylinder.Second pair of rod oil cylinder 6 is identical with the structure of first pair of rod oil cylinder 3, this second pair of rod oil cylinder comprises: the second cylinder body portion 60, be arranged on second piston 63 in the second cylinder body portion 60, the 3rd piston rod 61 and the 4th piston rod 62 that are arranged on second piston, 63 two ends and pass from the second cylinder body portion, 60 two ends respectively, wherein, the 3rd piston rod 61 is hinged with workplatform 7.Second piston 63 is divided into the 3rd cavity portion 65 that is provided with the 3rd piston rod 61 and the 4th cavity portion 66 that is provided with the 4th piston rod 62 with the second cylinder body portion 60, the 3rd piston rod 61 is identical with the 4th piston rod 62 diameters, and the 3rd piston rod is identical with the first piston shank diameter of first pair of rod oil cylinder 3.In conjunction with reference to figure 3, as can be seen, the second cylinder body portion 60 and the second jib section 22 are hinged, and hinge-point is E ', and the 3rd piston rod 61 is articulated on the bench board 7, and hinge-point is C '.
The first ED limit of adjusting triangle EDC that hinge-point E, D, C form equates with the second E ' D ' limit of adjusting triangle E ' D ' C ' that hinge-point E ', D ', C ' form, the DC limit of triangle EDC is parallel and equal with the D ' C ' limit of triangle E ' D ' C ', the EC limit of triangle EDC is parallel and equal with the E ' C ' limit of triangle E ' D ' C ', like this, triangle EDC and triangle E ' D ' C ' are congruent triangles, like this workplatform 7 maintenance levels at limit D ' C ' place.
By among Fig. 3 as can be seen, brace fluctuating device 8 is connected with jib drive.For example brace fluctuating device 8 is the brace fluctuating oil cylinder 8 shown in the figure, and its cylinder body portion and rotary table 1 are hinged, and piston rod and jib first section 21 is hinged, is used to control the lifting of whole jib end.
Wherein, the hydraulic fluid port 37 of the first cavity portion 35 of first pair of rod oil cylinder 3 communicates by first oil circuit 91 with the hydraulic fluid port 68 of the 4th cavity portion 66 of second pair of rod oil cylinder 6, and the hydraulic fluid port 38 of the second cavity portion 36 of first pair of rod oil cylinder 3 communicates by second oil circuit 92 with the hydraulic fluid port 67 of the 3rd cavity portion 65 of second pair of rod oil cylinder 6.
Like this, jib under the effect of brace fluctuating oil cylinder 8 when hinge-point A rotates, second connecting rod 5 remains parallel with rotary table 1, first pair of rod oil cylinder 3 correspondingly done with first section motion of jib and stretched out motion or retraction movement, second pair of rod oil cylinder 6 carries out the stretching out of equal length or the action of withdrawing simultaneously with first pair of rod oil cylinder 3 under the effect of hydraulic oil, triangle EDC and triangle E ' D ' C ' are always congruent triangles, be that limit D ' C ' and limit DC remain level, thereby make the workplatform 7 at D ' C ' place, limit remain level.
Being rotated to horizontal direction by vertical direction with jib below is example, describes the principle of work of leveling structure of the present utility model in detail.
When jib 2 was in a certain static mode of operation, the EC limit of triangle EDC equated with the E ' C ' limit of triangle E ' D ' C '.When jib 2 by vertical direction when horizontal direction is rotated, brace fluctuating oil cylinder 8 is done contractile motion, the first piston bar 31 of first pair of rod oil cylinder 3 is done and is stretched out motion, the hydraulic oil of the first cavity portion 35 of first pair of rod oil cylinder 3 is discharged from hydraulic fluid port 37, enter the 4th cavity portion 66 of second pair of rod oil cylinder 6 by oil circuit 91, and then it is protruding to promote the 3rd piston rod 61 of second pair of rod oil cylinder 6.First pair of rod oil cylinder 3 of cause and second pair of rod oil cylinder 6 structure are identical, the first piston bar 31 of first pair of rod oil cylinder 3 is identical with second piston rod, 32 diameters, the 3rd piston rod 61 of second pair of rod oil cylinder 6 is identical with the 4th piston rod 62 diameters, so because of first piston bar 31 protruding hydraulic pressure oil masses of discharging from the first cavity portion 35 of first pair of rod oil cylinder 3, after entering the 4th cavity portion 66 of second hydraulic ram 6, can make the 3rd piston rod 61 extension elongations of second pair of rod oil cylinder 6 equal the extension elongation of the first piston bar 31 of first pair of rod oil cylinder 3, the hydraulic oil of discharging from the 3rd cavity portion 65 of second pair of rod oil cylinder 6 enters the second cavity portion 36 of first pair of rod oil cylinder simultaneously, make the oil piping system of win two rod oil cylinders 3 and second pair of rod oil cylinder 6 formation keep dynamic balance, make triangle EDC and triangle E ' D ' C ' be always congruent triangles, limit D ' C ' and limit DC remain level, workplatform 7 also remains parallel, and whole leveling process is to regulate continuously, workplatform 7 does not have and rocks, and has increased the operation convenience of leveling process, serviceability and safety.And utilize the convenient advantage of arranging of hydraulic oil pipeline, and make the leveling structure more simple, also have high leveling precision simultaneously.
Need to prove that the specific embodiment of the brace fluctuating device 8 in the foregoing description is a variety of in addition, is not limited to the embodiment of the hydraulic ram in the foregoing description, drive the function that jib rotates as long as can reach.In addition, the set-up mode of first pair of rod oil cylinder 3 and second pair of rod oil cylinder 6 is not limit the specific embodiment in the foregoing description yet, as long as make the EC limit of triangle EDC and the E ' C ' limit of triangle E ' D ' C ' carry out stretching out or shrinking of equal length all the time simultaneously.Exception, the jib in the utility model for example is single-unit arm or multi-stage telescopic arms, can not influence the application of levelling gear of the present utility model.
A kind of aerial lift device and the aerial platform of also providing of the present utility model comprises the levelling gear of foregoing aerial lift device.
In sum, the utility model provides the levelling gear that is applicable to aerial lift device that a kind of simple in structure, reliable, leveling precision height, leveling are continuous, applied widely, have more the sense of security.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims (7)

1. the levelling gear of an aerial lift device comprises: rotary table (1), and jib (2),
Fluctuating oil cylinder (8) and workplatform (7) is characterized in that, also comprise:
First connecting rod (4), one end and described rotary table (1) are hinged;
Second connecting rod (5), one end and described jib (2) are hinged, and the other end of the other end and described first connecting rod (4) is hinged;
Wherein, described rotary table (1) forms parallelogram ABCD with hinge-point C, the described second connecting rod (5) of described second connecting rod (5) with the hinge-point D of described jib (2) with hinge-point B, the described first connecting rod (4) of described rotary table (1) with hinge-point A, the described first connecting rod (4) of described jib (2);
Described levelling gear also comprises: first pair of rod oil cylinder (3), and its cylinder body portion and described jib are hinged, and hinge-point is E, and an one piston rod is articulated on the described hinge-point C; Described hinge-point D, described hinge-point E and described hinge-point C form first and adjust triangle DEC;
Second pair of rod oil cylinder (6), its cylinder body portion and described jib (2) are hinged, and an one piston rod and described workplatform (7) are hinged; Described jib (2) forms second adjustment triangle D ' E ' C ' with hinge-point E ', described second pair of rod oil cylinder (6) of described jib (2) with the hinge-point C ' of described workplatform (7) with hinge-point D ', described second pair of rod oil cylinder (6) of described workplatform (7);
It is congruent triangles that the described first adjustment triangle DEC and described second adjusts triangle D ' E ' C ', and wherein, the ED limit equates that with E ' D ' limit the DC limit is parallel and equal with D ' C ' limit, and the EC limit is parallel and equal with E ' C ' limit.
2. levelling gear according to claim 1 is characterized in that,
Described first pair of rod oil cylinder (3) comprising: the first cylinder body portion (30); First piston (33) is arranged in the described first cylinder body portion (30); The first piston bar (31) and second piston rod (32) that are separately positioned on described first piston (33) two ends and pass from described first cylinder body portion (30) two ends; Described first piston bar is identical with described second diameter of piston rod, and described first piston bar (31) is articulated on the described hinge-point C; Described first piston (33) is divided into first cavity portion (35) that is provided with first piston bar (31) and the second cavity portion (36) that is provided with second piston rod (32) with the described first cylinder body portion (30);
Described second pair of rod oil cylinder (6), identical with described first pair of rod oil cylinder (3) structure, it comprises: the second cylinder body portion (60); Second piston (63); The 3rd piston rod (61) and the 4th piston rod (62), wherein, described the 3rd piston rod (61) is hinged with described workplatform (7); Described second piston (63) is divided into the 3rd cavity portion (65) that is provided with the 3rd piston rod (61) and the 4th cavity portion (66) that is provided with the 4th piston rod (62) with the described second cylinder body portion (60);
The hydraulic fluid port (37) of the described first cavity portion (35) communicates with the hydraulic fluid port (68) of described the 4th cavity portion (66), and the hydraulic fluid port (38) of the described second cavity portion (36) communicates with the hydraulic fluid port (67) of described the 3rd cavity portion (65).
3. levelling gear according to claim 1 is characterized in that, described jib (2) is the single-unit arm.
4. levelling gear according to claim 1 is characterized in that, described jib (2) is many cloth telescopic boom.
5. levelling gear according to claim 1 is characterized in that, the cylinder body portion of described fluctuating oil cylinder (8) and described rotary table (1) are hinged, and the piston rod of described fluctuating oil cylinder and described jib (2) are hinged.
6. an aerial lift device is characterized in that, comprises the levelling gear of each described aerial lift device in the claim 1 to 5.
7. an aerial platform is characterized in that, comprises the described aerial lift device of claim 6.
CN2010202868143U 2010-08-10 2010-08-10 High-altitude operation device and leveling mechanism and high-altitude operation car of high-altitude operation device Expired - Fee Related CN201785176U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102515066A (en) * 2011-12-31 2012-06-27 杭州爱知工程车辆有限公司 Overhead working truck working bucket levelling device with anti-overturn mechanism
CN103193178A (en) * 2013-03-21 2013-07-10 广州白云液压机械厂有限公司 Double-cylinder closed-cycle lifting platform four-bar linkage
CN103526942A (en) * 2013-09-25 2014-01-22 三一汽车制造有限公司 Concrete pump truck and arm frame connecting mechanism thereof
CN104261318A (en) * 2014-08-07 2015-01-07 南京晨光森田环保科技有限公司 Optimization selection method of leveling point of driving oil cylinder and driven oil cylinder on aerial work platform

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102515066A (en) * 2011-12-31 2012-06-27 杭州爱知工程车辆有限公司 Overhead working truck working bucket levelling device with anti-overturn mechanism
CN103193178A (en) * 2013-03-21 2013-07-10 广州白云液压机械厂有限公司 Double-cylinder closed-cycle lifting platform four-bar linkage
CN103193178B (en) * 2013-03-21 2015-05-27 广州白云液压机械厂有限公司 Double-cylinder closed-cycle lifting platform four-bar linkage
CN103526942A (en) * 2013-09-25 2014-01-22 三一汽车制造有限公司 Concrete pump truck and arm frame connecting mechanism thereof
CN103526942B (en) * 2013-09-25 2016-04-06 三一汽车制造有限公司 Concrete mixer and jib bindiny mechanism thereof
CN104261318A (en) * 2014-08-07 2015-01-07 南京晨光森田环保科技有限公司 Optimization selection method of leveling point of driving oil cylinder and driven oil cylinder on aerial work platform

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Granted publication date: 20110406

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