WO2018036181A1 - Structure de flèche en treillis et grue - Google Patents

Structure de flèche en treillis et grue Download PDF

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Publication number
WO2018036181A1
WO2018036181A1 PCT/CN2017/081276 CN2017081276W WO2018036181A1 WO 2018036181 A1 WO2018036181 A1 WO 2018036181A1 CN 2017081276 W CN2017081276 W CN 2017081276W WO 2018036181 A1 WO2018036181 A1 WO 2018036181A1
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WO
WIPO (PCT)
Prior art keywords
cylinder
joint
frame
truss arm
connecting portion
Prior art date
Application number
PCT/CN2017/081276
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English (en)
Chinese (zh)
Inventor
陆川
曹立峰
陈志灿
张平海
谷思生
付玉琴
李长青
于敬利
Original Assignee
徐州重型机械有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 徐州重型机械有限公司 filed Critical 徐州重型机械有限公司
Publication of WO2018036181A1 publication Critical patent/WO2018036181A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/66—Outer or upper end constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/82—Luffing gear

Definitions

  • the invention relates to the field of engineering machinery, in particular to a truss arm structure and a crane.
  • the truss arm is installed at the end of the main arm, and is mainly composed of a seamless steel pipe. The length thereof is adjusted by increasing or decreasing the lengthening section 104, and is used for expanding the working range of the boom system and improving the lifting height of the whole vehicle. .
  • the truss arm boom can generally realize different angle transformations, and the angle transformation is mainly completed by the combination of the rotating frame 102 and the stepless variator cylinder 103.
  • the telescopic arm is provided with a connecting frame 101, and the connecting frame 101 is rotatably connected with the rotating frame 102, and the rotation thereof is driven by the stepless variable amplitude cylinder 103 provided between the two.
  • the lower hinge point 108 of the rotating frame 102 and the lower hinge point of the connecting frame 101 are rotatably connected, that is, the rotation point A of the entire truss arm structure is formed.
  • the bottom of the rotating frame 102 protrudes toward the connecting frame 101, and a stepless variable amplitude cylinder 103 is disposed between the upper hinge point of the connecting frame 101 and the upper hinge point of the rotating frame 102.
  • the truss arm structure when the truss arm structure is placed horizontally on the ground, the side facing the sky is the top and the side facing the ground is the bottom.
  • the rotation point A designed by the existing truss arm structure is located at the bottom of the boom, and the stepless variator cylinder 103 is located at the top of the boom, as shown in FIGS. 1 and 2.
  • a jib 105 is provided at the top end of the extension section 104, and two jibs 106 are provided at the top end of the section jib 105.
  • the main chord 107 is shown in Figure 2.
  • the prior art has the stepless variable amplitude cylinder 103 disposed on the top of the boom structure. Although the design difficulty is small, the top stepless variable oil cylinder 103 is used during the crane lifting operation. The tensile force is increased, which increases the safety hazard caused by the internal leakage problem of the stepless variable amplitude cylinder 103, and affects the safety of the lifting equipment.
  • One of the objects of the present invention is to provide a truss arm structure and a crane for optimizing an existing truss arm structure.
  • the present invention provides the following technical solutions:
  • An embodiment of the present invention provides a truss arm structure, including a connecting frame, a rotating frame and a slewing cylinder; the connecting frame is rotatably connected to the rotating frame, and one end of the variator cylinder and the connecting frame are rotatable Connected, the other end of the luffing cylinder is rotatably coupled to the rotating frame; wherein the luffing cylinder is subjected to pressure.
  • the connecting bracket includes a first connecting portion at the top and a second connecting portion at the bottom, the rotating frame including a third connecting portion at the top and a fourth connecting portion at the bottom;
  • the first connecting portion and the third connecting portion are rotatably connected, and the second connecting portion and one end of the horn cylinder are rotatably connected, and the other end of the horn cylinder and the fourth connecting portion are rotatably connected Rotatable connection
  • the first connecting portion is located at a side of the second connecting portion adjacent to the rotating frame, and the third connecting portion is located at a position of the fourth connecting portion One side of the connector.
  • the connecting bracket includes a first joint and a first tubular member, the first joint is provided with a first connecting hole, and the first connecting hole serves as the first connecting portion, the first The number of tubes is at least two, and one end of each of the first tubes is connected to the first joint, and the other end of each of the first tubes is for connecting with the telescopic arm.
  • the first joint includes a first bent plate and a first vertical plate, and the number of the first vertical plates is at least two, and each of the first vertical plates is disposed in parallel with the One side of the first bent plate is recessed, and each of the first vertical plates is provided with the first connecting hole.
  • each of the first tubular members are separated from one another.
  • the rotating frame includes a second joint and a second pipe, the second joint is provided with a second connecting hole, and the second connecting hole serves as the third connecting portion, the first The number of the two tubular members is at least two, and one end of each of the second tubular members is connected to the second joint, and the other end of each of the second tubular members is connected to the secondary arm.
  • each of the second tubular members are separated from one another.
  • the second joint includes a second bent plate and a second vertical plate, the second vertical plate is at least two, and each of the second vertical plates is disposed in parallel with the A concave side of the second bending plate, each of the second vertical plates is provided with the second connecting hole.
  • the top of the connecting frame is of an equal cross-sectional structure; and/or the connecting frame The bottom is a variable cross-sectional structure.
  • the rotating frame is a variable cross-sectional structure as a whole.
  • the number of the variable amplitude cylinders is at least two, and each of the variable amplitude cylinders is arranged side by side.
  • the embodiment of the invention further provides a crane, comprising the truss arm structure provided by any technical solution of the invention.
  • the embodiments of the present invention can at least produce the following technical effects:
  • the above-mentioned pressure cylinder type truss arm structure adopts a hydraulic cylinder to realize stepless amplitude variation, and changes the structure of the rotating frame, so that the variable amplitude cylinder can be disposed at the bottom, and the variable amplitude cylinder is subjected to pressure instead of pulling force during lifting operation, and fully avoids
  • the safety of the hydraulic cylinder is caused by the leakage of the hydraulic cylinder, so that the boom has good overall stability.
  • FIG. 1 is a schematic structural view of a truss arm structure in the prior art
  • Figure 2 is a partial enlarged view of Figure 1;
  • Figure 3 is a schematic view of another angle of the portion shown in Figure 2;
  • FIG. 4 is a schematic structural view of a truss arm according to an embodiment of the present invention.
  • Figure 5 is a partial schematic view showing the structure of the truss arm when the variable amplitude cylinder is fully retracted;
  • Figure 6 is a partial schematic view showing the structure of the truss arm when the variable amplitude cylinder is fully extended;
  • Figure 7 is a partial structural view of the connecting frame
  • Figure 8 is a partial structural view of the rotating frame
  • Figure 9 is a partial structural view of the connecting frame
  • Figure 10 is a schematic view showing the structure of the connecting frame.
  • Truss arm A type of structure installed at the end of a boom to increase the length of the boom, the lifting height, and the hoisting weight.
  • the truss arm is mainly composed of seamless steel tubes.
  • Rotating frame A truss structure that is connected to the front part (ie, the jib) through a hinge point and a stepless variability cylinder.
  • the working angle of the truss arm is changed by adjusting the telescopic length of the stepless variator cylinder.
  • Connecting frame A truss structure with different front and rear end sections with different cross-sections and connected to the boom.
  • Stepless variable amplitude cylinder A hydraulic cylinder located between the truss arm rotating frame and the connecting frame for realizing the lifting angle transformation of the truss arm.
  • Embodiments of the present invention provide a truss arm structure for connecting a jib arm to a telescopic arm to expand the working range of the crane.
  • the jib of each section of the truss arm structure can adopt a box type steel plate structure.
  • an embodiment of the present invention provides a truss arm structure, including a connecting frame 1, a rotating frame 2, and a variator cylinder 3.
  • the connecting frame 1 and the rotating frame 2 are rotatably connected, one end of the variable amplitude cylinder 3 is rotatably connected with the connecting frame 1, and the other end of the variable amplitude cylinder 3 is rotatably connected with the rotating frame 2.
  • the variable amplitude cylinder 3 is subjected to pressure.
  • the setting position of the variable amplitude cylinder 3 is such that it is subjected to pressure without receiving tensile force to avoid a safety hazard due to internal leakage of the hydraulic cylinder, so that the boom has good overall stability.
  • the truss arm structure includes a connecting frame 1, a rotating frame 2, and a variator cylinder 3.
  • the connector 1 includes a first connecting portion 16 at the top and a second connecting portion 17 at the bottom.
  • the revolving frame 2 includes a third connecting portion 26 at the top and a fourth connecting portion 27 at the bottom.
  • the first connecting portion 16 and the third connecting portion 26 are rotatably connected, the second connecting portion 17 and one end of the variator cylinder 3 are rotatably connected, and the other end of the slewing cylinder 3 is rotatably connected to the fourth connecting portion 27.
  • the first connecting portion 16 is located at a side of the second connecting portion 17 near the rotating frame 2
  • the third connecting portion 26 is located at the fourth connecting portion.
  • 27 is adjacent to one side of the connecting frame 1 so that there is sufficient space between the second connecting portion 17 and the fourth connecting portion 27 to enable the luffing cylinder 3 to be disposed.
  • the outer end joint of the truss arm structure luffing cylinder 3 is rotatably connected with the second connecting portion 17 of the connecting frame 1, and the cylinder rod end joint is rotatably connected with the fourth connecting portion 27 of the rotating frame 2, and the connecting frame is connected.
  • the first connecting portion 16 is connected to the third connecting portion 26 of the revolving frame 2 as a luffing hinge.
  • the expansion and contraction cylinder 3 telescopic will drive the rotating frame 2 to rotate relative to the luffing hinge to realize the variable amplitude.
  • the above-mentioned truss arm structure is used to assemble the slewing cylinder 3 to the bottom of the boom.
  • the following relationship is taken as an example.
  • the jib angle is 0 degrees; the variator cylinder 3 is fully deflated.
  • the jib angle is 30 degrees; when the splay cylinder 3 is half extended, the jib angle is 15 degrees.
  • the variable angle is the angle between the length direction of the main arm and the longitudinal direction of one of the jib 5/two jibs 6.
  • variable-width cylinder 3 when the variable-width cylinder 3 is located at the bottom, the boom is changed from 0 degree to 30 degrees, the cylinder is gradually shortened, and the connecting frame 1 adopts a structure with a concave bottom and a convex top, and the variable-width cylinder 3 is disposed at the bottom. Stretching provides enough space.
  • the variable amplitude cylinder 3 is disposed at the bottom of the connecting frame 1 and the rotating frame 2.
  • the variable amplitude cylinder 3 is mainly subjected to pressure, and the intrinsic solution is solved from the system principle.
  • the safety hazard caused by the leakage can fully exert the high compressive performance of the weld and improve the performance of the boom; under the same performance, the cylinder affected by the pressure is lighter than the cylinder with the tensile force.
  • the above technical solution optimizes the truss arm structure and increases the stability of the crane.
  • the connector 1 includes a first joint 11 and a first tubular member 12.
  • the first joint 11 is provided with a first connecting hole 13 as a first connecting portion 16.
  • the number of the first tubes 12 is at least two, and one end of each of the first tubes 12 is connected to the first joint 11, and the other end of each of the first tubes 12 is connected to the telescopic arm.
  • the size of the first joint 11 is smaller than the size of the telescopic arm, which makes the first tubular members 12 have a divergent structure, that is, the ends of the first tubular members 12 connected to the first joint 11 are relatively close to each other, and are relatively concentrated; The other end of the first tubular member 12 is relatively dispersed, as shown in FIG.
  • the connecting frame 1 of this structure is more evenly balanced.
  • the stability problem of the main chord 7 and the form of the force determine the structural form.
  • the connecting structure of the above-mentioned structure can be rotated at the joint, and the single-point divergent structure can perfectly cooperate with the pressure-changing variator cylinder 3, so that the connection of the above structure is achieved.
  • Frame 1 is more balanced.
  • the first joint 11 includes a first bent plate 14 and a first vertical plate 15, and the number of the first vertical plates 15 is at least two.
  • Each of the first vertical plates 15 is disposed in parallel on a concave side of the first bent plate 14 , and each of the first vertical plates 15 is provided with a first connecting hole 13 .
  • the first joint 11 described above has a semi-package structure and can enclose the structure at the third joint portion 26.
  • the joints of the connecting frame 1 and the rotating frame 2 and the variable amplitude cylinder 3 are designed to be double-forked with the oil cylinder and a semi-packed compact structure which is connected with the single-point divergence of the seamless steel pipe, and is reinforced by the bending plate 8, see FIG.
  • the joint is in the form of an effective joint of the cylinder type truss arm.
  • the rotating frame 2 can adopt the following structure.
  • the rotating frame 2 includes a second joint 21 and a second pipe member 22.
  • the second joint 21 is provided with a second connecting hole 23, and the second connecting hole 23 serves as a third connecting portion. 26.
  • the pin passes through the first connecting hole 13 and the second connecting hole 23 to form a rotatable connection between the rotating frame 2 and the connecting frame 1.
  • the number of the second tubular members 22 is at least two, and one end of each of the second tubular members 22 is connected to the second joint 21, and the other end of each of the second tubular members 22 is connected to the secondary arm.
  • one ends of the respective second tubular members 22 are concentrated, and the other ends of the respective second tubular members 22 are separated from each other.
  • the second joint 21 described above, the rotary joint at the receiving end, and the single-point diverging structure can be perfectly matched with the pressure-varying variator cylinder 3.
  • the connecting frame 1 and the rotating frame 2 are designed, the design principle of equalizing the force of the truss structure and limiting the length of the compressed pipe member is adopted, and the connection with the variable amplitude cylinder 3 is received, thereby improving the strength and stability of the truss structure. Create a telescopic space for the variable amplitude cylinder 3 to improve the variable amplitude efficiency.
  • the second joint 21 includes a second bent plate 24 and a second vertical plate 25 .
  • the number of the second vertical plates 25 is at least two, and each of the second vertical plates 25 is disposed in parallel with the second bent plate 24 .
  • On the concave side, each of the second vertical plates 25 is provided with a second connecting hole 23.
  • each of the second tubular members 22 is connected to the second bent plate 24 to form a relatively concentrated structure, and the other end of the second tubular member 22 is dispersed to make the force relatively balanced.
  • the top of the connecting frame 1 has an equal cross-sectional structure. And/or, the bottom of the connecting frame 1 has a variable cross-sectional structure.
  • the top of the connecting frame 1 has an equal section structure, the joint of the variable amplitude hinge point is upturned, the bottom part is a variable section, and the bottom joint is retracted, on the one hand, the assembly space is created for the variable amplitude cylinder 3, and on the other hand, the compressed main chord can be reduced. Length of 7, With other chord and web structure, the optimal truss structure is formed.
  • the third connecting portion 26 of the rotating frame 2 is convexly convex and upturned, and the fourth connecting portion 27 is concave, so that the variable-width cylinder 3 is provided at the bottom to leave a space, thereby ensuring the stability of the truss arm structure connection.
  • the rotating frame 2 is a variable-section truss structure.
  • the height, length and rear section size of the design are optimized at the same time to realize the truss structure of the rotating frame 2 as a whole.
  • the joint between the bottom and the variable-speed cylinder 3 is closed.
  • the lower convexity can reduce the length of the compressed main chord 7 and increase the critical force; the reasonable compression direction of the variable amplitude cylinder 3 and the optimal force arm design form a truss type force of the variable position of the pressure cylinder type truss arm structure.
  • Both the connecting frame 1 and the rotating frame 2 are truss structures, which makes the truss arm structure form a full truss structure, replacing the original steel plate box structure, fully utilizing the truss structure, light weight, high strength, small wind load, processing The process is simple and so on.
  • variable amplitude cylinders 3 may be at least two, and the respective variable amplitude cylinders 3 are arranged side by side, so that the force is more stable.
  • the above technical solution is designed to be a semi-package compact structure with a double-fork connection of the oil cylinder and a single-point divergence connection with the seamless steel pipe, and the single-point divergent connection can distribute the pressure of the variable-range cylinder 3 to a plurality of non-distributed states. Sewed steel pipe, all seamless steel pipes are balanced and fully exerted the bearing capacity of all seamless steel pipes, which greatly enhances the stability of the structure.
  • the structure is used as an effective joint form of the cylinder type truss arm, so that the variable amplitude cylinder 3 does not interfere with the joint when the variable amplitude cylinder 3 under pressure is changed, so that the joint has better strength and stability, and also makes the cylinder pressure It can be balancedly transmitted to the truss structure to avoid the phenomenon that the overall structure is partially stressed, and the overall performance of the boom is improved.
  • the embodiment of the invention further provides a crane, comprising the truss arm structure provided by any technical solution of the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)

Abstract

La présente invention concerne une structure de flèche en treillis et une grue. La structure de flèche en treillis comprend un cadre de raccordement (1), un cadre rotatif (2), et un cylindre d'huile à amplitude variable (3). Le cadre de raccordement (1) est raccordé en rotation au cadre rotatif (2). Une extrémité du cylindre d'huile à amplitude variable (3) est raccordée en rotation au cadre de raccordement (1), l'autre extrémité du cylindre d'huile à amplitude variable (3) est raccordée en rotation au cadre rotatif (2), et le cylindre d'huile à amplitude variable (3) supporte une pression. Au moyen de la forme de structure de la flèche en treillis de type cylindre à pression, les structures du cadre rotatif et du cadre de raccordement sont modifiées, de telle sorte que le cylindre d'huile à amplitude variable peut être disposé au niveau du fond, supporte une pression et ne supporte pas une force de traction et, en conséquence, des risques de sécurité potentiels provoqués par une fuite interne d'un cylindre à huile hydraulique sont évités.
PCT/CN2017/081276 2016-08-25 2017-04-20 Structure de flèche en treillis et grue WO2018036181A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610723080.2A CN106241628A (zh) 2016-08-25 2016-08-25 桁架臂结构及起重机
CN201610723080.2 2016-08-25

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111170179A (zh) * 2018-11-12 2020-05-19 广东庞源工程机械有限公司 一种塔机起重臂加固框架
CN113173524A (zh) * 2021-05-28 2021-07-27 广东工业大学 一种伸缩臂叉车液压动态称重方法、装置、设备和介质

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106241628A (zh) * 2016-08-25 2016-12-21 徐州重型机械有限公司 桁架臂结构及起重机
CN109305630A (zh) * 2018-12-11 2019-02-05 中联重科股份有限公司 起重机的组合副臂、臂架以及起重机
CN112919340A (zh) * 2021-02-26 2021-06-08 徐州建机工程机械有限公司 一种小型住宅建造用汽车式快装塔机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1477451B1 (fr) * 2003-05-13 2007-02-28 Grove U.S. LLC Dispositif de déroulement pour une flèchette de grue mobile
CN103318785A (zh) * 2013-07-08 2013-09-25 徐州重型机械有限公司 一种起重机及其固定副臂变幅装置
CN103626058A (zh) * 2013-12-17 2014-03-12 三一汽车起重机械有限公司 副臂变幅装置、起重机及副臂变幅方法
CN105060140A (zh) * 2015-08-19 2015-11-18 徐州重型机械有限公司 起重机的副臂、起重臂和起重机
CN106241628A (zh) * 2016-08-25 2016-12-21 徐州重型机械有限公司 桁架臂结构及起重机

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203382420U (zh) * 2013-07-08 2014-01-08 徐州重型机械有限公司 一种起重机及其固定副臂变幅装置
CN203474324U (zh) * 2013-10-14 2014-03-12 中联重科股份有限公司 起重机臂架系统及起重机
CN204057774U (zh) * 2014-08-15 2014-12-31 中联重科股份有限公司 起重机副臂及起重机

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1477451B1 (fr) * 2003-05-13 2007-02-28 Grove U.S. LLC Dispositif de déroulement pour une flèchette de grue mobile
CN103318785A (zh) * 2013-07-08 2013-09-25 徐州重型机械有限公司 一种起重机及其固定副臂变幅装置
CN103626058A (zh) * 2013-12-17 2014-03-12 三一汽车起重机械有限公司 副臂变幅装置、起重机及副臂变幅方法
CN105060140A (zh) * 2015-08-19 2015-11-18 徐州重型机械有限公司 起重机的副臂、起重臂和起重机
CN106241628A (zh) * 2016-08-25 2016-12-21 徐州重型机械有限公司 桁架臂结构及起重机

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111170179A (zh) * 2018-11-12 2020-05-19 广东庞源工程机械有限公司 一种塔机起重臂加固框架
CN113173524A (zh) * 2021-05-28 2021-07-27 广东工业大学 一种伸缩臂叉车液压动态称重方法、装置、设备和介质

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