CN105293301A - Windproof tower crane - Google Patents

Windproof tower crane Download PDF

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Publication number
CN105293301A
CN105293301A CN201510827831.0A CN201510827831A CN105293301A CN 105293301 A CN105293301 A CN 105293301A CN 201510827831 A CN201510827831 A CN 201510827831A CN 105293301 A CN105293301 A CN 105293301A
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CN
China
Prior art keywords
counterweight
fixed
slideway
tower
arm
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Application number
CN201510827831.0A
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Chinese (zh)
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CN105293301B (en
Inventor
胡陈光
朱建锋
金志锋
谢永成
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Jiaxing Juteng Information Technology Co., Ltd.
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ZHENHAI CONSTRUCTION GROUP Co Ltd
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Priority to CN201510827831.0A priority Critical patent/CN105293301B/en
Publication of CN105293301A publication Critical patent/CN105293301A/en
Application granted granted Critical
Publication of CN105293301B publication Critical patent/CN105293301B/en
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Abstract

The invention discloses a windproof tower crane and relates to constructional engineering machines. A cargo boom and a balance arm are rotationally arranged on a rotary table. The cargo boom is provided with a first electric telescopic fixing rod, a second electric telescopic fixing rod is arranged on the balance arm, and the rotary table is provided with a first fixing groove and a second fixing groove. A first rope pulling tower and a second rope pulling tower are arranged on the top ends of the cargo boom and the balance arm. A first rope stretching device and a second rope stretching device are arranged on the tower top. The first rope pulling tower and the first rope stretching device are connected through a first rope. The second rope pulling tower and the second rope stretching device are connected through a second rope. A counterweight lifting device is arranged on the top inside a jacking frame and can vertically move in a standard knot. The balance arm is provided with a counterweight slide matched with the counterweight lifting device. Compared with the prior art, a balancing weight can be rapidly mounted and dismounted when a typhoon comes or under other strong wind states, and the cargo boom and the balance arm can be bent after the balancing weight is dismounted so as to reduce the windward area and keep the gravity center of a tower body stable.

Description

Windproof tower crane
Technical field
The present invention relates to a kind of constructional engineering machinery, especially relate to a kind of building ground tower crane.
Background technology
Tower crane is called for short tower machine, also known as tower crane, originates from West Europe.It is exactly the rotary crane that swing arm is contained in towering tower body top.Tower crane working space is large, is mainly used in the installation of vertical and horizontal feed and the building element of material in housing construction.Be made up of metal construction, operating mechanism and electric system three part.Metal construction comprises tower body, swing arm and base etc.Operating mechanism hoists, luffing, revolution and walking four part.Electric system comprises electrical motor, controller, electric power distribution cabinet, connection line, signal and illumination equipment etc.Along with the progress of engineering technology, the floor of present building is more and more higher, make required tower crane also more and more higher, but too high tower crane has the problem of poor stability, especially at southeastern coast During Typhoon, often there is tower crane and hung in typhoon sky the event created greater casualties.In addition, tower crane all needs to install clump weight, and clump weight is all hang on tower crane with other loop wheel machines mostly, and installing/dismounting bothers, and makes tower crane to realize fast-assembling.
Summary of the invention
The present invention is directed to deficiency of the prior art, provide windproof tower crane, the present invention not only can under typhoon or other strong wind states Fast Installation dismounting clump weight, palintrope can also be unloaded at clump weight and turn up weighing arm and equilibrium arm to reduce area exposed to the wind maintenance tower body steadily of centre of gravity.
In order to solve the problems of the technologies described above, the present invention is solved by following technical proposals: windproof tower crane, comprise pedestal, tower body, jacking stock, rotating table, tower top, crane arm, equilibrium arm and clump weight, described tower body is built by several standard knots, described jacking stock can move on described standard knot, described rotating table is arranged on described jacking cover top of the trellis, described tower top is arranged on described rotating table, described crane arm and described equilibrium arm are rotatably provided on described rotating table, described crane arm is relative with described equilibrium arm position, described crane arm is provided with several first electric expansion fixed links, described rotating table is provided with the first hold down groove matched with described first electric expansion fixed link, described equilibrium arm is provided with several second electric expansion fixed links, described rotating table is provided with the second hold down groove matched with described second electric expansion fixed link, described crane arm and top, described equilibrium arm top are respectively arranged with first Guyed Towers and second Guyed Towers, described tower top is provided with first tubing sections device and second tubing sections device, be connected by first rope between described first Guyed Towers with described first tubing sections device, be connected by second rope between described second Guyed Towers with described second tubing sections device, in described jacking stock, top is provided with counterweight jacking system, described counterweight jacking system can move up and down in described standard knot inside, described equilibrium arm is provided with the counterweight slideway matched with described counterweight jacking system.
In technique scheme, preferably, described counterweight jacking system comprises lifter, described lifter is provided with some stay cords, described stay cord is provided with counterweight fixed way, described counterweight fixed way is provided with fixed way slideway, and described fixed way slideway slides is provided with several clump weight fixed mounts, described counterweight slideway is provided with the alignment device matched with described fixed way slideway.
In technique scheme, preferably, described alignment device electric rotation shaft, described electric rotation shaft is provided with connecting panel, described connecting panel is provided with the connection slideway coordinated with described fixed way slideway and described counterweight slideway, described connecting panel is also provided with several electric expansion limited posts, described fixed way is provided with the spacing hole matched with described electric expansion limited post.
In technique scheme, preferably, described spacing hole is tapered, inwardly reduces gradually from opening part.
In technique scheme, preferably, described clump weight fixed mount is provided with protection framework, drive motor and electronic locked piece.
In technique scheme, preferably, described protection framework biside plate is respectively arranged with inside fixed lobe, described clump weight is provided with the fixed groove matched with described fixed lobe.
In technique scheme, preferably, several supporting linkages are provided with between described counterweight slideway and described equilibrium arm.
Existing clump weight is all lifted by crane, the installation of one piece one piece is needed during lifting, not only installation effectiveness is low, time is long, also dismounting operation cannot be carried out when bad environments, once projection strong wind, clump weight cannot unload the crank being very easy to cause tower crane, jeopardizes production and construction safety.The present invention is then the installation that counterweight jacking system by being arranged on tower crane inside carries out clump weight, without the need to external force, and not by the impact of weather, as long as tower crane can carry out work, just can carry out the dismounting of clump weight.Its cardinal principle utilizes standard knot inner space to form transport channel, in this passage, carry out the rise of clump weight and put down, then after clump weight rises to top, moved to the end of equilibrium arm by the counterweight slideway on equilibrium arm, be fixed finally by the anchor fitting on equilibrium arm.Consistent when principle and installation when clump weight unloads, first removed by anchor fitting fixing, then slide onto on counterweight jacking system, be finally down to ground.In order to reach this effect, counterweight jacking system of the present invention comprises lifter, lifter is provided with some stay cords, stay cord is provided with counterweight fixed way, counterweight fixed way is provided with fixed way slideway, fixed way slideway is provided with clump weight fixed mount.Clump weight is put on clump weight fixed mount, and the fixed way slideway on counterweight fixed way can be aimed at through with counterweight slideway, completed the rise and fall of clump weight by lifter, completes clump weight again move on equilibrium arm by counterweight slideway and fixed way slideway.Again because counterweight jacking system once can transport multiple clump weight or single clump weight, make tower crane in use can increase or reduce breeding fast, also avoid and need now again to replace all clump weight problems.After clump weight unloads, first electric expansion fixed link and second electric expansion fixed link can be unclamped, crane arm can be rotated relative to rotating table with equilibrium arm.The rotation of crane arm and equilibrium arm is controlled by first tubing sections device and second tubing sections device, when first tubing sections device and second tubing sections device put rope, crane arm and equilibrium arm overturn downwards, and when first tubing sections device and second tubing sections device rope closing, crane arm and equilibrium arm upwards overturn.Stop operating after crane arm is vertical with equilibrium arm, now the area exposed to the wind of tower crane is minimum, and center of gravity is the most stable, can not keep under the environment of blast.When needing to use, only need again crane arm and equilibrium arm to be dug, and be fixed on rotating table by first electric expansion fixed link and second electric expansion fixed link.
Compared with prior art, the invention has the beneficial effects as follows: the present invention not only can under typhoon or other strong wind states Fast Installation dismounting clump weight, palintrope can also be unloaded at clump weight and turn up weighing arm and equilibrium arm to reduce area exposed to the wind maintenance tower body steadily of centre of gravity.
Accompanying drawing explanation
Fig. 1 is front schematic view of the present invention.
Fig. 2 is contraction state schematic diagram of the present invention.
Fig. 3 is contraction process schematic diagram of the present invention.
Fig. 4 is using state schematic diagram of the present invention.
Fig. 5 is connecting panel schematic diagram of the present invention.
Fig. 6 is clump weight fixed mount side schematic view of the present invention.
Fig. 7 is clump weight fixed mount front schematic view of the present invention.
Fig. 8 is standard knot schematic diagram of the present invention.
Fig. 9 is that Fig. 4-A of the present invention locates partial enlarged drawing schematic diagram.
Figure 10 is that Fig. 4-B of the present invention locates partial enlarged drawing schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing and detailed description of the invention, the present invention is described in further detail.
As shown in Figures 1 to 10, windproof tower crane, comprise pedestal 1, tower body 2, jacking stock 3, rotating table 6, tower top 7, crane arm 5, equilibrium arm 4 and clump weight 11, described tower body 2 is built by several standard knots 21, described jacking stock 3 can move on described standard knot 21, described rotating table 6 is arranged on described jacking stock 3 top, and described tower top 7 is arranged on described rotating table 6.
Described rotating table 6 is respectively arranged with lifting rotating shaft 63 and balance rotating shaft 61, crane arm 5 rotates and is arranged in lifting rotating shaft 63, equilibrium arm 4 rotates and is arranged in balance rotating shaft 61, described crane arm 5 is relative with described equilibrium arm 4 position, described crane arm 5 is provided with several first electric expansion fixed links 64, described rotating table 6 is provided with the first hold down groove matched with described first electric expansion fixed link 64, described equilibrium arm 4 is provided with several second electric expansion fixed links 63, described rotating table 6 is provided with the second hold down groove matched with described second electric expansion fixed link 63, described crane arm 5 and top, described equilibrium arm 4 top are respectively arranged with first Guyed Towers 55 and second Guyed Towers 48, described tower top 7 is provided with first tubing sections device 73 and second tubing sections device 71, be connected by first rope 74 between described first Guyed Towers 55 with described first tubing sections device 73, 72 are connected by second rope between described second Guyed Towers 48 with described second tubing sections device 71, described first rope 74 and described second rope 72 are all that some steel ropes twist into.Described equilibrium arm 4 top is rotated and is provided with electronic drag hook 46, and described electronic drag hook 46 can hang over the junction between two standard knots 21.Described crane arm 5 top is provided with the cambered way 53 be connected with described lifting slideway 51, has occluding device 54 between described lifting slideway 51 and described cambered way 53.Described crane arm 5 and described equilibrium arm 4 top end are respectively arranged with first cable lifter 56 and second cable lifter 47, described pedestal 1 are provided with the fixed hook 13 coordinated with described first cable lifter 56 and described second cable lifter 47.
In described jacking stock 3, top is provided with counterweight jacking system 8, described counterweight jacking system 8 can move up and down in described standard knot 21 inside, described equilibrium arm 4 is provided with the counterweight slideway 41 matched with described counterweight jacking system 8, between described counterweight slideway 41 and described equilibrium arm 4, is provided with several supporting linkages 42.Described counterweight jacking system 8 comprises lifter 81, described lifter 81 is provided with some stay cords 82, described stay cord 82 is provided with counterweight fixed way 83, described counterweight fixed way 83 is provided with fixed way slideway 84, described fixed way slideway 84 slides and is provided with several clump weight fixed mounts 85, described clump weight fixed mount 85 is provided with protection framework 853, drive motor 851 and electronic locked piece 852.Described protection framework 853 biside plate is respectively arranged with inside fixed lobe 854, described clump weight 11 is provided with the fixed groove matched with described fixed lobe 854.Described counterweight slideway 41 is provided with the alignment device 43 matched with described fixed way slideway 84.Described alignment device 43 comprises electric rotation shaft 431, described electric rotation shaft 431 is provided with connecting panel 432, described connecting panel 432 is provided with the connection slideway 433 coordinated with described fixed way slideway 84 and described counterweight slideway 41, described connecting panel 432 is also provided with several electric expansion limited posts 434, described fixed way 83 is provided with the spacing hole 86 matched with described electric expansion limited post 434.Described spacing hole 86 is tapered, inwardly reduces gradually from opening part.
Described equilibrium arm 4 is also provided with the anchor fitting 44 of fixing described clump weight 11 and the airbag apparatus 45 of the described clump weight 11 of protection, described anchor fitting 44 comprises electric turnover frame 441, described electric turnover frame 441 is provided with telescopic cylinder 442, described telescopic cylinder 442 is provided with fixed dam 443.Described airbag apparatus 45 comprise be arranged on bottom, described equilibrium arm 4451 top can the air bag of repeated inflation, described air bag 451 is the cuboid of opening upwards, is provided with fast connection interface 452 between described air bag 451 and described equilibrium arm 4.Described jacking stock 3 is provided with several electronic coilers 32, described electronic coiler 32 comprises fixing hawser 33, described pedestal 1 is provided with the hook 12 matched with described fixing hawser 33.
Tower crane of the present invention can before inclement weather arrives rapid removal clump weight 11 and pack up crane arm 5 and equilibrium arm 4, change tower crane center of gravity and wind surface by this measure, to reduce the probability that tower crane topples under strong wind weather.After weather improves, can reinstall again clump weight 11 and expansion crane arm 5 and equilibrium arm 4 fast allows tower crane devote oneself to work at once.Its cardinal principle first by counterweight jacking system 8, clump weight 11 is unloaded down to pedestal 1.First need to unclamp fixed dam 443 by being pressed on clump weight 11 by anchor fitting 44, then receive fixed dam 443 by electric turnover frame 441 and telescopic cylinder 442 and allow whole anchor fitting 44 away from counterweight slideway 41, not affecting the slippage of clump weight fixed mount 85.Then rotational alignment device 43 allows connection slideway 433 on standard apparatus 43 and counterweight slideway 41 UNICOM.Move up and down counterweight fixed way 83 by lifter 81, allow counterweight fixed way 83 roughly align with connecting panel 432, the electric expansion limited post 434 on its relief connecting panel 432 stretches out, and is inserted in the spacing hole 86 on counterweight fixed way 83.Because spacing hole 86 is tapered and inwardly reduce gradually from opening part, electric expansion limited post 434 can be allowed to extend in spacing hole 86 when counterweight fixed way 83 has certain deviation with connecting panel 432, and electric expansion limited post 434 can allow counterweight fixed way 83 and connecting panel 432 complete matching after stretching into completely, now connect slideway 433, counterweight slideway 41 is communicated with the fixed way slideway 8 on counterweight fixed way 83, the drive motor 851 on clump weight fixed mount 85 is allowed to start, automatic sliding is on counterweight fixed way 83, after on all clump weight fixed mounts 85 all slippage to counterweight fixed way 83, start electronic locked piece 852 on clump weight fixed mount 85, prevent clump weight fixed mount 85 from sliding at fixed way slideway 8.Finally by lifter 81, counterweight fixed way 83 is moved on on pedestal 1.
After clump weight 11 moves on to pedestal 1, first rope 74 between tensioning first Guyed Towers 55 with first tubing sections device 73 and the second rope between second Guyed Towers 48 with second tubing sections device 71 are connected 72, then allow crane arm 5, device of fixedly making between equilibrium arm 4 with rotating table 6 be separated, both unclamp first electric expansion fixed link 64 and second electric expansion fixed link 63.Subsequently turn lower crane arm 5 and equilibrium arm 4 slowly at first tubing sections device 73 and putting in rope action of second tubing sections device 71.Before crane arm 5 and equilibrium arm 4 rotate, need the air bag 451 be arranged on equilibrium arm 4 to be exitted and bends to regain alignment device 43; Unclamp the occluding device 54 on crane arm 5 between lifting slideway 51 and cambered way 53, allow lifting slideway 51 and cambered way 53 UNICOM, facilitate suspender 52 to move on cambered way 53.The first cable lifter 56 being arranged on crane arm 5 and equilibrium arm 4 top end and second cable lifter 47 can be allowed after crane arm 5 and equilibrium arm 4 have rotated to fall connecting rope, and rope is tied up on the fixed hook 13 on pedestal 1, can prevent crane arm 5 and equilibrium arm 4 in inclement weather from can swing with the wind like this and have an accident.The junction between two standard knots 21 can also be hung over if necessary by the electronic drag hook 46 on equilibrium arm 4, equilibrium arm 4 is better fixed.
Only need during installation to carry out reverse operating, both first by first tubing sections device 73 and second tubing sections device 71 crane arm 5 and equilibrium arm 4 pull-up again, then by first electric expansion fixed link 64 and second electric expansion fixed link 63 allow crane arm 5 and equilibrium arm 4 fixing with rotating table 6.After fixedly completing, both clump weight fixed mount 85 can be risen again, by connection slideway 433 and counterweight slideway 41, clump weight fixed mount 85 be moved to equilibrium arm 4 top.After clump weight fixed mount 85 moves to equilibrium arm 4 top, prop up clump weight fixed mount 85 by the fixed dam 443 on anchor fitting 44, keep the stable of clump weight fixed mount 85.Because clump weight fixed mount 85 can install single clump weight 11 additional, so operationally installing additional and dismantling of clump weight 11 can be carried out at any time, keep the force balance that crane arm 5 is different between equilibrium arm 4.Air bag 451 has two kinds of modes when reclaiming, and one is direct venting, then follows equilibrium arm 4 and folds together, and another kind is directly put down by fast connection interface 452.Air bag 451 is if there is to topple and clump weight 11 drops situation in effect of the present invention, air bag 451 can be allowed to wrap up clump weight 11, although air bag 451 cannot stop dropping of clump weight 11, but air bag 451 can stop clump weight 11 to break the particle of rear splashing into pieces, prevent these particles from splashing and hurt sb.'s feelings and damage machine.The present invention simultaneously is also provided with limit guide groove 31 on jacking stock 3, limit guide groove 31 can auxiliary criteria joint 21 installation, the sliver 22 matched with limit guide groove 31 is provided with at standard knot 21 top, be provided with bottom standard knot 21 match with described sliver 22 agree with groove 23, limit guide groove 31 opening is exit skirt, when standard knot 21 installs additional in jacking stock 3, sliver 22 can be allowed to move along limit guide groove 31, easier aligning, after aiming at guide groove 31 also with agree with groove 23 and agree with, expediently the standard knot 21 of upper/lower positions is aimed at and is agreed with, have and utilize the fixing of next step standard knot 21.

Claims (7)

1. windproof tower crane, comprise pedestal (1), tower body (2), jacking stock (3), rotating table (6), tower top (7), crane arm (5), equilibrium arm (4) and clump weight (11), described tower body (2) is built by several standard knots (21), described jacking stock (3) can be upper mobile at described standard knot (21), described rotating table (6) is arranged on described jacking stock (3) top, described tower top (7) is arranged on described rotating table (6), described crane arm is provided with lifting slideway (51), the upper slip of described lifting slideway (51) is provided with suspender (52), it is characterized by, described crane arm (5) and described equilibrium arm (4) are rotatably provided on described rotating table (6), described crane arm (5) is relative with described equilibrium arm (4) position, described crane arm (5) is provided with several first electric expansion fixed links (64), described rotating table (6) is provided with the first hold down groove matched with described first electric expansion fixed link (64), described equilibrium arm (4) is provided with several second electric expansion fixed links (62), described rotating table (6) is provided with the second hold down groove matched with described second electric expansion fixed link (62), described crane arm (5) and described equilibrium arm (4) top, top are respectively arranged with first Guyed Towers (55) and second Guyed Towers (48), described tower top (7) is provided with first tubing sections device (73) and second tubing sections device (71), be connected by first rope (74) between described first Guyed Towers (55) with described first tubing sections device (73), be connected by second rope (72) between described second Guyed Towers (48) with described second tubing sections device (71), described first rope (74) and described second rope (48) are all that some steel ropes twist into, in described jacking stock (3), top is provided with counterweight jacking system (8), described counterweight jacking system (8) can move up and down in described standard knot (21) inside, described equilibrium arm (4) is provided with the counterweight slideway (41) matched with described counterweight jacking system (8).
2. windproof tower crane according to claim 1, it is characterized by, described counterweight jacking system (8) comprises lifter (81), described lifter (81) is provided with some stay cords (82), described stay cord (82) is provided with counterweight fixed way (83), described counterweight fixed way (83) is provided with fixed way slideway (84), the upper slip of described fixed way slideway (84) is provided with several clump weight fixed mounts (85), described counterweight slideway (41) is provided with the alignment device (43) matched with described fixed way slideway (84).
3. windproof tower crane according to claim 2, it is characterized by, described alignment device (43) comprises electric rotation shaft (431), described electric rotation shaft (431) is provided with connecting panel (432), described connecting panel (432) is provided with the connection slideway () 433 coordinated with described fixed way slideway (84) and described counterweight slideway (41), described connecting panel (432) is also provided with several electric expansion limited posts (434), described fixed way (83) is provided with the spacing hole (86) matched with described electric expansion limited post (434).
4. windproof tower crane according to claim 3, is characterized by, and described spacing hole (86) is tapered, inwardly reduces gradually from opening part.
5. windproof tower crane according to claim 2, is characterized by, and described clump weight fixed mount (85) is provided with protection framework (853), drive motor (851) and electronic locked piece (852).
6. windproof tower crane according to claim 5, it is characterized by, described protection framework (853) biside plate is respectively arranged with inside fixed lobe (854), described clump weight (11) is provided with the fixed groove matched with described fixed lobe (854).
7. windproof tower crane according to claim 1, is characterized by, and is provided with several supporting linkages (42) between described counterweight slideway (41) and described equilibrium arm (4).
CN201510827831.0A 2015-11-25 2015-11-25 Windproof tower crane Active CN105293301B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110482421A (en) * 2019-08-17 2019-11-22 温州瓯厦建设有限公司 A kind of adaptive counterweight tower crane
CN111392606A (en) * 2020-03-25 2020-07-10 徐州国联建机有限公司 Tower crane with additional balance structure

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3307893C2 (en) * 1983-03-05 1985-01-24 Pekazett Baumaschinen Gmbh, 6660 Zweibruecken, De
CN2793032Y (en) * 2005-03-17 2006-07-05 辽宁工程技术大学 Adjustable counterweight tower shaped crane
CN201942450U (en) * 2010-11-16 2011-08-24 云南建工第五建设有限公司 Automatic crane balance controller
CN203284095U (en) * 2013-06-05 2013-11-13 山东淄建集团有限公司 Tower crane for cooling tower
CN103832936A (en) * 2013-12-17 2014-06-04 朝阳凌云建筑机械有限公司 Lifting moment balance system of tower crane

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3307893C2 (en) * 1983-03-05 1985-01-24 Pekazett Baumaschinen Gmbh, 6660 Zweibruecken, De
CN2793032Y (en) * 2005-03-17 2006-07-05 辽宁工程技术大学 Adjustable counterweight tower shaped crane
CN201942450U (en) * 2010-11-16 2011-08-24 云南建工第五建设有限公司 Automatic crane balance controller
CN203284095U (en) * 2013-06-05 2013-11-13 山东淄建集团有限公司 Tower crane for cooling tower
CN103832936A (en) * 2013-12-17 2014-06-04 朝阳凌云建筑机械有限公司 Lifting moment balance system of tower crane

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110482421A (en) * 2019-08-17 2019-11-22 温州瓯厦建设有限公司 A kind of adaptive counterweight tower crane
CN111392606A (en) * 2020-03-25 2020-07-10 徐州国联建机有限公司 Tower crane with additional balance structure
CN111392606B (en) * 2020-03-25 2021-06-15 徐州国联建机有限公司 Tower crane with additional balance structure

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Effective date of registration: 20191025

Address after: 314500 room 1-402, building 647, Shiji Avenue, Chongfu Town, Tongxiang City, Jiaxing City, Zhejiang Province

Patentee after: Jiaxing Juteng Information Technology Co., Ltd.

Address before: 315202 West Village, Jiulong Town, Zhenhai District, Zhejiang, Ningbo

Patentee before: ZHENHAI CONSTRUCTION GROUP CO., LTD.