WO2023005564A1 - Dispositif de support de poulie de super-levage, support de bras et grue - Google Patents

Dispositif de support de poulie de super-levage, support de bras et grue Download PDF

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Publication number
WO2023005564A1
WO2023005564A1 PCT/CN2022/101812 CN2022101812W WO2023005564A1 WO 2023005564 A1 WO2023005564 A1 WO 2023005564A1 CN 2022101812 W CN2022101812 W CN 2022101812W WO 2023005564 A1 WO2023005564 A1 WO 2023005564A1
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WO
WIPO (PCT)
Prior art keywords
bracket
limiting member
super
superlift
boom
Prior art date
Application number
PCT/CN2022/101812
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English (en)
Chinese (zh)
Inventor
石丽君
邵吉吉
Original Assignee
湖南三一中型起重机械有限公司
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Filing date
Publication date
Application filed by 湖南三一中型起重机械有限公司 filed Critical 湖南三一中型起重机械有限公司
Publication of WO2023005564A1 publication Critical patent/WO2023005564A1/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
    • 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
    • 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
    • B66C23/88—Safety gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/03—Cranes with arms or jibs; Multiple cranes
    • B66C2700/0392—Movement of the crane arm; Coupling of the crane arm with the counterweights; Safety devices for the movement of the arm

Definitions

  • the present application relates to the technical field of construction machinery, in particular, to a superlift pulley bracket device, a jib and a crane.
  • the super-lift device is used on the crane, which includes the super-lift arm and the super-lift pulley bracket.
  • the super-lift arm needs to rotate around the hinge point of the super-lift arm and the boom before the pulley Lift off the superlift block bracket.
  • the bracket of the super-lifting pulley cannot rotate together with the super-lifting jib, otherwise the pulley will rotate together, which will cause the pulley to fail to support or directly fall off from the bracket, causing accidents.
  • the bracket needs to be transferred to the jib for fixing before the super-lift jib is raised, so as to ensure that the positions of the bracket and the jib remain unchanged during the super-lift jib.
  • the process of transferring the bracket to the jib for fixing is complicated and the installation efficiency is low.
  • the problem solved by this application is how to cancel the step of transferring the bracket to the jib for fixing when the super jib is raised, so as to improve the installation efficiency.
  • the present application provides a superlift pulley bracket device, including a fixing device, a bracket, a first limiting member, a second limiting member and a third limiting member, and the fixing device is suitable for being arranged on on the super-lifting arm;
  • the bracket is rotatably connected to the fixing device, the first limiting member is arranged on the bracket, and the second limiting member is adapted to be arranged on the lifting arm,
  • the third limiting member is arranged on the fixing device;
  • the first limiting member When the super-lifting arm is in the retracted state, the first limiting member is in contact with the second limiting member or is provided with a gap, and the bracket is in contact with the third limiting member so that the The bracket is balanced under its own weight;
  • the bracket When the super-lifting boom is widened, the bracket is separated from the third limiter, and the first limiter and the second limiter are adapted to contact so that the bracket is supported on on the boom.
  • the first limiting member includes a first plate connected to the bracket; the second limiting member includes a second plate adapted to In connection with the boom, the first board is adapted to be supported on the second board when the super boom is raised.
  • the superlift pulley bracket device also includes a first fastener, the fixing device is provided with a mounting groove and a first hole structure, the first hole structure communicates with the mounting groove, and the bracket A second hole structure is provided, a part of the bracket is adapted to extend into the installation groove, and the first fastener is adapted to pass through the first hole structure and the second hole structure to connect The bracket and the fixing device.
  • the bracket includes a first connecting portion and a second connecting portion connected to each other, the first connecting portion is provided with the second hole structure, and the first connecting portion is adapted to extend into the installation In the groove, the second connecting part is provided with the first stopper, and when the super-lifting arm is in the super-lifting state, the fixing device and the second connecting part are away from the side of the boom End contact or gap setting.
  • the third limiting member is disposed in the installation groove, the third limiting member is located on the rotation path of the first connecting part, and the third limiting member is suitable for being connected with the The first connecting portion abuts against.
  • the second connecting part includes a first body, a second body and a third body, the first body is connected to the first connecting part, and the second body and the second body are arranged at intervals On the first body, the first body is provided with a first card slot, and the second body is provided with a second card slot, and the first card slot and the second card slot are suitable for supporting the pulley assembly , so that the pulley assembly is located between the first body and the second body.
  • the superlift pulley bracket device further includes a second fastener, the bracket is provided with a third hole structure, and the second fastener is adapted to pass through the third hole structure, The second fastener is adapted to connect with the pulley assembly.
  • the present application also provides a jib, including the above-mentioned superlift pulley bracket device.
  • the boom also includes a super-lift arm and a boom, the super-lift arm and the boom are rotatably connected, and the fixing device of the super-lift pulley bracket device is arranged on the super-lift arm , the rotation axis of the bracket of the superlift pulley bracket device and the fixing device is arranged coaxially with the rotation axes of the superlift arm and the boom.
  • the present application also provides a crane, comprising the above-mentioned superlift pulley bracket device, and/or, the above-mentioned jib.
  • the fixing device is arranged on the super-lifting arm; the bracket is rotatably connected with the fixing device, since the first limiting part is arranged on the bracket, the second limiting part is suitable for being arranged on the boom, and the third limiting part is arranged on on the bracket; thus, when the super-lifting arm is in the retracted state, the first limiter and the second limiter are in contact or are arranged in a gap, and the bracket is in contact with the third limiter so that the bracket is in contact with the second limiter.
  • the bracket is separated from the third limiter, and the first limiter and the second limiter are suitable for contact so that the bracket is supported on the boom, compared to Compared with the prior art, the present application does not need to remove the bracket assembly from the super-lift arm and transfer it to the boom for fixing during the raising process of the super-lift boom. The relative position of the bracket and the boom is always kept unchanged. Improve installation efficiency.
  • Fig. 1 is an exploded schematic view of an embodiment of a superlift sheave bracket device in the present application
  • Fig. 2 is the structural schematic diagram of the connection between the fixing device and the super-lift arm in the present application
  • Fig. 3 is a structural schematic diagram of another viewing angle of the bracket in the present application.
  • Fig. 4 is the assembly schematic diagram of an embodiment of bracket and pulley assembly in the present application.
  • Fig. 5 is a schematic diagram of the assembly of the second limiting member and an embodiment of the boom in the present application;
  • Fig. 6 is a schematic diagram of the position of the super-lift arm in the retracted state, the boom and the super-lift pulley bracket device in the present application;
  • Fig. 7 is a schematic diagram of the position of the boom and the bracket device of the superlift pulley when the boom is in the superlift state in the present application.
  • Fixing device 11. Installation slot; 2. Bracket; 21. First connection part; 211. Second hole structure; 22. Second connection part; 221. First body; 222. Second body; 2221. The third hole structure; 2222, the first card slot; 223, the third body; 2231, the second card slot; 3, the first limiter; 4, the second limiter; 5, the third limiter; 6 , the first fastener; 7, the second fastener; 8, the pulley assembly; 81, the movable pulley; 82, the wheel frame; 83, the connecting shaft; 9, the lifting arm; 10, the super lifting arm.
  • the Z-axis in the drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z-axis (that is, the arrow pointing to the Z-axis) represents the top, and the reverse of the Z-axis represents the bottom;
  • the X-axis in the drawings represents the horizontal direction , and specified as the left and right positions, and the positive direction of the X-axis represents the right side, and the reverse direction of the X-axis represents the left side;
  • Reverse represents the front side; at the same time, it should be noted that the meanings of the aforementioned Z-axis, Y-axis and X-axis are only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific Orientation, construction and operation in a particular orientation and therefore should not be construed as limiting the application.
  • the embodiment of the present application provides a superlift pulley bracket device, including a fixing device 1, a bracket 2, a first limiter 3, a second limiter 4 and a third limiter 5, the fixing device 1 is suitable for being arranged on the super-lifting arm 10; the bracket 2 is rotatably connected with the fixing device 1, and the first limiting member 3 is arranged on the bracket 2, so that The second limiting member 4 is adapted to be arranged on the boom 9, and the third limiting member 5 is arranged on the fixing device 1; The first limiting member 3 is in contact with the second limiting member 4 or is arranged in a gap, and the bracket 2 is in contact with the third limiting member 5 so that the bracket 2 maintains balance under its own weight; When the superlift arm 10 is widened, the bracket 2 is separated from the third limiting member 5, and the first limiting member 3 and the second limiting member 4 are adapted to contact so that the The bracket 2 is supported on the boom 9 .
  • the bracket 2 and the fixing device 1 are connected in rotation through a pin shaft (described in detail later), as shown in Figure 2, the rotation axes of the bracket 2 and the fixing device 1 are suitable for The axes of rotation of the superlift arm 10 and the boom 9 are coaxial, so that when the superlift arm 10 rotates relative to the boom 9, the fixing device 1 and the bracket 2 rotate coaxially, thereby not interfering with the superlift arm 10.
  • the arm 10 swivels.
  • the retractable state of the super-lift boom 10 refers to the state when the super-lift boom 10 is not working, that is, the state that the super-lift boom 10 is supported on the boom 9 in parallel.
  • the fixing device 1 is arranged on the super lifting arm 10;
  • the stopper 4 is adapted to be arranged on the boom 9, and the third stopper 5 is arranged on the bracket 2; thus, when the super-lift arm 10 is in the retracted state, the first stopper 3 and the The second limiter 4 contacts or is arranged in a gap, and the bracket 2 contacts with the third limiter 5 so that the bracket maintains balance under its own weight; Part 5 is separated, and the first stopper 3 and the second stopper 4 are suitable for contacting so that the bracket 2 is supported on the boom 9.
  • the present application is In the process, there is no need to remove the bracket 2 from the super-lift arm 10 and transfer it to the boom 9 for fixing, and the relative position of the bracket and the boom 9 always remains unchanged, which improves the installation efficiency.
  • the first limiting member 3 includes a first plate connected to the bracket 2; the second limiting member 4 includes a second plate, The second plate is adapted to be connected with the jib 9 , and the first plate is adapted to be supported on the second plate when the super-lift jib 10 is raised.
  • the superlift pulley bracket device is generally located above the side of the boom 9, so the first plate is arranged on the side end surface of the bracket 2 facing the boom 9, which can be welded or bolted.
  • the second plate is arranged on the top of the boom 9, and it can also be welded, bolted, etc. Keeping a balance under its own weight, at this time, the first plate and the second plate are in contact or are arranged in a gap, preferably, the first plate and the second plate are just in contact.
  • the side facing each other of the first plate and the second plate can be provided with a damping plate, thus, when the super-lift arm 10 is raised, the damping plate can reduce the gap between the first plate and the second plate. contact stress between them.
  • a reinforcing plate is provided between the first plate and the side wall of the bracket 2, and the number of reinforcing plates is not limited, and it can be one, two or three.
  • the superlift pulley bracket device also includes a first fastener 6, and the fixing device 1 is provided with a mounting groove 11 and a first hole structure, and the first hole structure and the first hole structure
  • the mounting groove 11 communicates
  • the bracket 2 is provided with a second hole structure 211, a part of the bracket 2 is suitable for extending into the mounting groove 11, and the first fastener 6 is suitable for passing through the
  • the first hole structure and the second hole structure 211 are used to connect the bracket 2 and the fixing device 1 .
  • the first fastener 6 is a pin shaft
  • the fixing device 1 is provided with a mounting groove 11 and a first hole structure, wherein the first hole structure communicates with the mounting groove 11
  • the bracket 2 is provided with a second hole structure 211
  • a part of the bracket 2 is adapted to extend into the installation groove 11
  • the installation groove 11 plays a guiding role, which can limit the displacement of the bracket 2 in the X-axis direction, when the first hole structure and the second hole structure After 211 are aligned, the pin shaft passes through the first hole structure and the second hole structure 211 to connect the bracket 2 and the fixing device 1 .
  • the bracket 2 can rotate around the pin shaft, so that the fixing device 1 can rotate relative to the bracket 2 when the superlift arm 10 rotates for a width.
  • the bracket 2 includes a first connecting portion 21 and a second connecting portion 22 connected to each other, the first connecting portion 21 is provided with the second hole structure 211, the first The connecting part 21 is adapted to extend into the installation groove 11, the second connecting part 22 is provided with the first stopper 3, when the super-lifting arm 10 is in the super-lifting state, the fixing device 1 It is in contact with the side end of the second connecting portion 22 away from the boom 9 or provided with a gap.
  • the first connecting part 21 and the second connecting part 22 are connected end to end in the Y-axis direction, and the first connecting part 21 is provided with a second hole structure 211, so the first connecting part 21 is used to extend into the installation groove 11 to cooperate with the fixing device 1 to realize the rotation of the bracket 2 and the fixing device 1 .
  • the second connecting portion 22 is used for installing the pulley assembly 8 (described later), and the first plate is arranged on the second connecting portion 22 for cooperating with the second plate on the boom 9 .
  • the fixing device 1 is in contact with the side end of the second connecting portion 22 away from the boom 9 or is arranged with a gap.
  • the bracket 2 cannot rotate or the rotation range is small, and it plays a role in fixing the bracket 2.
  • the bracket 2 will not move, which reduces the occurrence of installation hazards.
  • the third limiting member 5 is arranged in the installation groove 11, the third limiting member 5 is located on the rotation path of the first connecting portion 21, and the third limiting member 5 The piece 5 is adapted to abut against the first connecting portion 21 .
  • the third limiting member 5 can be a pin shaft or a plate-shaped member, depending on actual needs, as shown in Figure 2, the third limiting member 5 is a pin shaft, which is arranged in the installation groove 11, Specifically, the fixing device 1 is provided with a pin hole communicating with the installation groove 11 , and the pin shaft passes through the pin hole, so that a part of the pin shaft is located in the installation groove 11 .
  • the third limiting member 5 is located on the rotation path of the first connecting portion 21. Since the bracket 2 needs to maintain balance under its own weight, when the third limiting member 5 is arranged above the bracket 2, its The hinge point of the bracket 2 is far away from the side where the pulley assembly 8 is set. When the third limiter 5 is arranged below the bracket 2, it is located on the side where the hinge point of the bracket 2 is close to the side where the pulley assembly 8 is set. In both configurations, the third limiting member 5 abuts against the first connecting portion 21 , so that the bracket 2 is kept balanced under its own weight.
  • the second connecting part 22 includes a first body 221, a second body 222 and a third body 223, the first body 221 is connected to the first connecting part 21, and the second body 222 and the third body 223 are arranged at intervals on the first body 221, the first body 221 is provided with a first slot 2222, the second body 222 is provided with a second slot 2231, and the first body 222 is provided with a second slot 2231.
  • a slot 2222 and the second slot 2231 are suitable for supporting the pulley assembly 8 so that the pulley assembly 8 is located between the first body 221 and the second body 222 .
  • the first body 221, the second body 222 and the third body 223 are integrally formed, and the three form a U-like structure.
  • One end surface of the first body 221 in the Y-axis direction is connected to the first connecting part 21.
  • the other end surface of the first body 221 in the Y-axis direction is connected to the second body 222 and the third body 223 .
  • the second body 222 and the third body 223 have the same structure, both are plate-shaped parts, the second body 222 and the third body 223 are arranged on the first body 221 at intervals, and the upper end surface of the first body 221 is provided with a second body.
  • a card slot 2222, the second body 222 is provided with a second card slot 2231 at the same position, the first card slot 2222 and the second card slot 2231 are suitable for supporting the pulley assembly 8, so that the pulley assembly 8 is located between the first body 221 and the second card slot Between the two bodies 222 .
  • the pulley assembly 8 of the super-lifting device includes a movable pulley 81 and a wheel frame 82.
  • the movable pulley 81 is arranged on the wheel frame 82 and is adapted to rotate relative to the wheel frame 82. Specifically, the movable pulley 81 passes through A connecting shaft 83 is limited in the rotation groove of the wheel frame 82.
  • the pulley assembly 8 is installed on the bracket 2, the two ends of the connecting shaft 83 are supported in the first slot 2222 and the second slot 2231, and the wheel frame 82 is set Between the first body 221 and the second body 222 .
  • the superlift pulley bracket device also includes a second fastener 7, the bracket 2 is provided with a third hole structure 2221, the second fastener 7 is suitable for passing through the In the third hole structure 2221 , the second fastener 7 is adapted to be connected with the pulley assembly 8 .
  • the second fastener 7 is a pin shaft
  • the second body 222 and the third body 223 of the bracket 2 are provided with a third hole structure 2221
  • the third hole structure 2221 of the second body 222 and the third body 223 The hole structure 2221 is coaxially arranged
  • the wheel frame 82 of the pulley assembly 8 is provided with a fourth hole structure.
  • the pin shaft passes through the third hole structure 2221 and the fourth hole structure to connect the wheel frame 82 and the bracket 2 .
  • the pulley assembly 8 can be limited on the bracket 2, so as to prevent the pulley assembly 8 from falling off from the bracket 2, thereby causing potential safety hazards.
  • FIGS. 6 and 7 Another embodiment of the jib of the present application, as shown in FIGS. 6 and 7 , includes the above-mentioned superlift pulley bracket device.
  • the jib also includes a superlift arm 10 and a boom 9, and the superlift arm 10 and the boom 9 are rotatably connected, and the fixing device of the superlift pulley bracket device 1 is arranged on the super-lift arm 10, the rotation axis of the bracket 2 of the super-lift pulley bracket device and the fixing device 1 is coaxial with the rotation axes of the super-lift arm 10 and the boom 9.
  • FIGS. 6 and 7 there are two super-lifting pulley bracket devices, and the two super-lifting pulley brackets are arranged symmetrically with respect to the super-lifting arm 10 .
  • the super-lift arm 10 and the boom 9 are rotatably connected by a pin shaft, and the fixing device 1 of the super-lift pulley bracket device is arranged on the super-lift arm 10, which can be welded or bolted.
  • the axis of rotation of the bracket 2 of the superlift pulley bracket device and the fixing device 1 is coaxial with the axis of rotation of the superlift arm 10 and the boom 9, thus, when the superlift arm 10 rotates the width, the bracket 2 and the The fixing device 1 rotates coaxially, thereby not interfering with the normal operation of the superlift arm 10 .
  • a crane according to yet another embodiment of the present application includes the above-mentioned superlift sheave bracket device, and/or, the above-mentioned jib.

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

Abstract

L'invention concerne un dispositif de support de poulie de super-levage, un support de bras et une grue. Le dispositif de support de poulie de super-levage comprend un dispositif de fixation (1), un support (2), un premier élément de limitation (3), un deuxième élément de limitation (4) et un troisième élément de limitation (5), le dispositif de fixation (1) étant conçu pour être agencé sur un bras de super-levage (10) ; le support (2) étant relié en rotation au dispositif de fixation (1), le premier élément de limitation (3) étant agencé sur le support (2), le deuxième élément de limitation (4) étant adapté à être agencé sur une flèche de grue (9) et le troisième élément de limitation (5) étant agencé sur le dispositif de fixation (1). Lorsque le bras de super-levage (10) est dans un état de rétraction, le premier élément de limitation (3) et le deuxième élément de limitation (4) entrent en contact l'un avec l'autre ou sont agencés avec un espacement entre eux, et le support (2) vient en contact avec le troisième élément de limitation (5) de manière à maintenir l'équilibre du support (2) sous son propre poids ; et lorsque le bras de super-levage (10) se soulève, le support (2) est séparé du troisième élément de limitation (5), et le premier élément de limitation (3) et le deuxième élément de limitation (4) sont appropriés pour venir en contact l'un avec l'autre, de sorte que le support est supporté sur la flèche de grue.
PCT/CN2022/101812 2021-07-30 2022-06-28 Dispositif de support de poulie de super-levage, support de bras et grue WO2023005564A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110872212.9 2021-07-30
CN202110872212.9A CN113401818B (zh) 2021-07-30 2021-07-30 一种超起滑轮托架装置、臂架及起重机

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WO2023005564A1 true WO2023005564A1 (fr) 2023-02-02

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PCT/CN2022/101812 WO2023005564A1 (fr) 2021-07-30 2022-06-28 Dispositif de support de poulie de super-levage, support de bras et grue

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WO (1) WO2023005564A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113401818B (zh) * 2021-07-30 2023-08-01 湖南三一中型起重机械有限公司 一种超起滑轮托架装置、臂架及起重机

Citations (8)

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Publication number Priority date Publication date Assignee Title
CN202379629U (zh) * 2011-12-27 2012-08-15 徐州重型机械有限公司 超起装置及起重机
CN103407908A (zh) * 2013-08-29 2013-11-27 徐州重型机械有限公司 起重机及其超起装置前张紧系统
CN103863956A (zh) * 2014-03-31 2014-06-18 徐州重型机械有限公司 一种具有自拆装超起装置的起重机及超起装置的装拆方法
JP2014144853A (ja) * 2013-01-29 2014-08-14 Kobelco Cranes Co Ltd ブーム及び起伏部材
CN203998733U (zh) * 2014-06-25 2014-12-10 徐州重型机械有限公司 一种臂架装置及其超起动滑轮托架
CN105460807A (zh) * 2015-11-24 2016-04-06 徐州重型机械有限公司 全地面起重机
US20190359456A1 (en) * 2018-05-23 2019-11-28 Kobelco Construction Machinery Co., Ltd. Swingable connection structure and crane provided with swingable connection structure
CN113401818A (zh) * 2021-07-30 2021-09-17 湖南三一中型起重机械有限公司 一种超起滑轮托架装置、臂架及起重机

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202379629U (zh) * 2011-12-27 2012-08-15 徐州重型机械有限公司 超起装置及起重机
JP2014144853A (ja) * 2013-01-29 2014-08-14 Kobelco Cranes Co Ltd ブーム及び起伏部材
CN103407908A (zh) * 2013-08-29 2013-11-27 徐州重型机械有限公司 起重机及其超起装置前张紧系统
CN103863956A (zh) * 2014-03-31 2014-06-18 徐州重型机械有限公司 一种具有自拆装超起装置的起重机及超起装置的装拆方法
CN203998733U (zh) * 2014-06-25 2014-12-10 徐州重型机械有限公司 一种臂架装置及其超起动滑轮托架
CN105460807A (zh) * 2015-11-24 2016-04-06 徐州重型机械有限公司 全地面起重机
US20190359456A1 (en) * 2018-05-23 2019-11-28 Kobelco Construction Machinery Co., Ltd. Swingable connection structure and crane provided with swingable connection structure
CN113401818A (zh) * 2021-07-30 2021-09-17 湖南三一中型起重机械有限公司 一种超起滑轮托架装置、臂架及起重机

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CN113401818B (zh) 2023-08-01

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