CN207699076U - From dismounting pole - Google Patents

From dismounting pole Download PDF

Info

Publication number
CN207699076U
CN207699076U CN201721788005.0U CN201721788005U CN207699076U CN 207699076 U CN207699076 U CN 207699076U CN 201721788005 U CN201721788005 U CN 201721788005U CN 207699076 U CN207699076 U CN 207699076U
Authority
CN
China
Prior art keywords
pole
bottom column
lever arm
upright post
fixed pulley
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201721788005.0U
Other languages
Chinese (zh)
Inventor
孙献雷
郭素宽
张光鑫
李雪亮
程军胜
潘晓忠
司素杰
刘仁强
赵兴
尹立新
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yatai Heavy Industry Ltd By Share Ltd
Original Assignee
Yatai Heavy Industry Ltd By Share Ltd
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 Yatai Heavy Industry Ltd By Share Ltd filed Critical Yatai Heavy Industry Ltd By Share Ltd
Priority to CN201721788005.0U priority Critical patent/CN207699076U/en
Application granted granted Critical
Publication of CN207699076U publication Critical patent/CN207699076U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Electric Cable Installation (AREA)

Abstract

The utility model provides a kind of from dismounting pole, belong to derrick crane maintenance of equipment technical field, including the pedestal being sequentially connected from bottom to top, bottom column, middle standing pillar and top upright post, one of bottom column and middle standing pillar side with tear open certainly sunpender cooperation be connected, from tearing open at the top of sunpender equipped with the hook coordinated with hoisting facilities, hook is located at the top of top upright post, bottom column rear portion is equipped with lifting mechanism, the top movable of top upright post connects split type pole arm, the front end of split type pole arm is equipped with the first fixed pulley and suspension hook, the rear end of split type pole arm is equipped with the second fixed pulley, and it is located at the upper end of top upright post, steel wire rope is wound in lifting mechanism, the outer end of steel wire rope bypasses the second fixed pulley, first fixed pulley is connected with suspension hook.Coordinated from sunpender is torn open by hook and hoisting facilities, can realize the lifting dismounting of each component above bottom column, can manually be easily accomplished self removing and installing for pole, improve work efficiency.

Description

From dismounting pole
Technical field
The utility model belongs to derrick crane maintenance of equipment technical field, is to be related to a kind of dismounting certainly more specifically Pole.
Background technology
Pole is a kind of derrick crane commonly device, the mechanism for replacing derrick crane damage.For tower Crane, mechanism damage will seriously affect production efficiency, if will be greatly increased using crane cost, and use pole can be big The cost of big reducing mechanism dismounting and time.But for large-scale derrick crane, since mechanism is heavy, required pole it is strong Degree greatly increases, therefore weight also accordingly increases, and is only difficult manually installing and dismounting.Therefore a kind of easy disassembly of production is designed Pole is very important.
Utility model content
The purpose of this utility model is to provide a kind of from dismounting pole, with solve it is existing in the prior art because pole from It is great and manually can not installing and dismounting the technical issues of.
To achieve the above object, the technical solution adopted in the utility model is:A kind of dismounting pole certainly is provided, including under Wherein the one of pedestal, bottom column, middle standing pillar and the top upright post being sequentially connected on and, the bottom column and middle standing pillar A side with tear sunpender cooperation open certainly and be connected, it is described from tearing open equipped with the hook for coordinating with hoisting facilities at the top of sunpender, it is described Hook is arranged in the top of top upright post, and the bottom column rear portion is equipped with lifting mechanism, the top movable of the top upright post Split type pole arm is connected, the front end of the split type pole arm is equipped with the first fixed pulley and suspension hook, the split type pole arm Rear end be equipped with the second fixed pulley and be arranged in the upper end of top upright post, the lifting mechanism and be wound with steel wire rope, the steel The outer end of cord is connected around the second fixed pulley, the first fixed pulley with suspension hook.
Further, the middle part of the pedestal is equipped with the shaft coaxial with the vertical axis of institute pedestal, the shaft it is upper End is equipped with the first flange for being connected with bottom column.
Further, the bottom of the shaft be equipped with for the fixed chassis in ground, the shaft and chassis, which rotate, matches It closes.
Further, the support cover being connected with chassis is set in the shaft.
Further, support cover side is equipped with link block, and the first flange is connected with link block by connecting pin.
Further, the bottom column includes cylinder and its connecting flange at both ends, and the upper end of the bottom column connects Acting flange is connected with the lower end connecting flange of middle standing pillar, the lower end connecting flange of the bottom column and the first flange of pedestal It is connected, the lower end of the top upright post is equipped with second flange, and the upper end connecting flange of the middle standing pillar is connected with second flange; The cylinder upper side is equipped with the gusset for lifting, and the gusset is equipped with lifting hole(eyelet);The side of the cylinder is equipped with and is used for Installation is from the first otic placode for tearing sunpender open, and described to be equipped with pin hole from the lower end level for tearing sunpender open, level is equipped on first otic placode Through-hole corresponding with pin hole, the pin hole are interior equipped with the first axis pin with through-hole;The structure of the middle standing pillar is vertical with the bottom Column is identical.
Further, the lifting mechanism includes the support base for being fixed on bottom column side, for Wound steel rope Reel and driving part for driving reel, the reel and driving part are arranged on support base, the driving part It is connected with reel.
Further, the split type pole arm includes preceding lever arm and rear lever arm, and first fixed pulley and suspension hook are arranged In the front end of preceding lever arm, the preceding lever arm is connect with rear lever arm by two the second axis pins, and second fixed pulley is arranged rear The rear end of lever arm, the rear lever arm are flexibly connected with top upright post.
Further, the upper end side of the top upright post is equipped with support plate, the middle and back of the rear lever arm and support plate Upper end connected by two third axis pins.
Further, the rear end of the preceding lever arm is symmetrical above and below is equipped with the second otic placode, it is described after lever arm front end above and below it is right Claim to be equipped with the third otic placode coordinated with the second otic placode, second axis pin runs through the middle part earhole of the second otic placode and third otic placode.
Advantageous effect provided by the utility model from dismounting pole is:Compared with prior art, the utility model from Dismounting pole is sequentially connected from bottom to top by pedestal, bottom column, middle standing pillar and top upright post, and lifting mechanism is fixed on bottom Portion column rear portion, the steel wire rope of lifting mechanism bypass top upright post top the second fixed pulley of split type pole arm rear end and preceding successively First fixed pulley at end is connected with suspension hook, and bottom column and the one of side of middle standing pillar are connected with tearing sunpender open certainly and coordinate, Coordinate from tearing open to link up at the top of sunpender with hoisting facilities, can realize the lifting dismounting of each component above bottom column, it is artificial to be It can be easily accomplished self removing and installing for pole, improved work efficiency.
Description of the drawings
It, below will be to embodiment or the prior art in order to illustrate more clearly of the technical scheme in the embodiment of the utility model Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only that this practicality is new Some embodiments of type for those of ordinary skill in the art without having to pay creative labor, can be with Obtain other attached drawings according to these attached drawings.
Fig. 1 is the structural schematic diagram from dismounting pole that the utility model embodiment provides;
Fig. 2 is the partial enlarged view at A in Fig. 1;
Fig. 3 is the partial enlarged view at B in Fig. 1;
Fig. 4 is the structural schematic diagram of bottom column in Fig. 1;
Wherein, each reference numeral in figure:
1- pedestals, 2- bottom columns, 3- middle standing pillars, 4- top upright posts, lever arm after 5-, lever arm before 6-, 7- are hung from tearing open Bar, 8- lifting mechanisms, 9- steel wire ropes, 10- suspension hooks, 11- hooks, the split type pole arms of 12-, the first fixed pulleys of 13-, 14- second Fixed pulley, 15- shafts, 16- first flanges, the chassis 17-, 18- support covers, 19- link blocks, 20- connecting pins, 21- cylinders, 22- Connecting flange, 23- gussets, the first otic placodes of 24-, 25- support bases, 26- reels, the second axis pins of 27-, 28- support plates, 29- thirds Axis pin, the second otic placodes of 30-, 31- third otic placodes.
Specific implementation mode
In order to make technical problem to be solved in the utility model, technical solution and advantageous effect be more clearly understood, with Lower combination accompanying drawings and embodiments, the present invention will be further described in detail.It should be appreciated that specific reality described herein It applies example to be only used to explain the utility model, is not used to limit the utility model.
It should be noted that when element is referred to as " being fixed on " or " being set to " another element, it can be directly another On one element or it is connected on another element.When an element is known as " being connected to " another element, it can To be directly to another element or be indirectly connected on another element.
It is to be appreciated that term " length ", " width ", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" "inner", "outside" is that orientation based on ... shown in the drawings or position are closed System, is merely for convenience of describing the present invention and simplifying the description, does not indicate or imply the indicated device or element is necessary With specific orientation, with specific azimuth configuration and operation, therefore should not be understood as limiting the present invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include one or more this feature.
Also referring to Fig. 1 and Fig. 4, now illustrated from dismounting pole to provided by the utility model.It is described to dismount certainly Pole, including the pedestal 1, bottom column 2, middle standing pillar 3 and the top upright post 4 that are sequentially connected from bottom to top, the bottom column 2 With one of middle standing pillar 3 side with tear the cooperation of sunpender 7 open certainly and be connected, it is described from tearing 7 top of sunpender open equipped with for The hook 11 for applying cooperation is reseted, the hook 11 is arranged in the top of top upright post 4, and 2 rear portion of the bottom column is equipped with raising The top movable of mechanism 8, the top upright post 4 connects split type pole arm 12, and the front end of the split type pole arm 12 is equipped with The rear end of first fixed pulley 13 and suspension hook 10, the split type pole arm 12 is equipped with the second fixed pulley 14 and setting is vertical at top The upper end of column 4, is wound with steel wire rope 9 in the lifting mechanism 8, and the outer end of the steel wire rope 9 is around the second fixed pulley 14, the One fixed pulley 13 is connected with suspension hook 10.
Certainly dismounting pole provided by the utility model, compared with prior art, the utility model has simple in structure, handling Convenient and efficient advantage passes through the pedestal of split structure, bottom column, middle standing pillar and top upright post phase successively from bottom to top Even, lifting mechanism is fixed on bottom column rear portion, and the steel wire rope of lifting mechanism bypasses the split type pole in top upright post top successively The second fixed pulley of arm rear end and the first fixed pulley of front end are connected with suspension hook, and bottom column and the one of side of middle standing pillar are equal It is connected with sunpender cooperation is torn open certainly, tears hook at the top of sunpender open certainly and coordinate with hoisting facilities, can realize each portion above bottom column The lifting of part is dismantled, and can be manually easily accomplished self removing and installing for pole, be improved work efficiency.
Further, referring to Fig. 2, as a kind of specific implementation mode provided by the utility model from dismounting pole, The middle part of the pedestal 1 is equipped with the shaft 15 coaxial with the vertical axis of institute pedestal 1, the upper end of the shaft 15 be equipped with for The connected first flange 16 of bottom column 1.It can be facilitated by shaft and bottom column is rotated into any angle, facilitated on hook Hoisting facilities lift each component of pole in bulk in place, are pulled without artificial, reduce the labor intensity of operating personnel.
Further, referring to Fig. 2, as a kind of specific implementation mode provided by the utility model from dismounting pole, The bottom of the shaft 15 be equipped with for the fixed chassis 17 in ground, the shaft 15 is rotatably assorted with chassis 17.Chassis four Week is equipped with connecting hole, can be fixed on the ground pedestal by bolt.
Further, referring to Fig. 2, as a kind of specific implementation mode provided by the utility model from dismounting pole, The support cover 18 being connected with chassis 17 is set in the shaft 15, the support is covered to be set between 18 sides and 17 upper surface of chassis There is reinforcing rib.Wherein, support cover be inverted U-shaped structure, shaft through support cover top setting, using support cover can countershaft into Row limit and reinforcing.
Further, please refer to Fig.1,2, as it is provided by the utility model from dismount pole a kind of specific embodiment party Formula, the support cover 18 sides and are equipped with link block 19, and the first flange 16 is connected with link block 19 by connecting pin 20.When After bottom column goes to certain angle, bottom column and pedestal can be relatively fixed using connecting pin, avoid bottom column with turn The rotation of axis and rotate, avoid hoisting facilities lift each component when personnel are damaged.
Further, please refer to Fig.1,4, as it is provided by the utility model from dismount pole a kind of specific embodiment party Formula, the bottom column 2 include cylinder 21 and its connecting flange 22 at both ends, the upper end connecting flange 22 of the bottom column 2 It is connected with the lower end connecting flange 22 of middle standing pillar 3, the lower end connecting flange 22 of the bottom column 2 and the first method of pedestal 1 Orchid 16 is connected, and the lower end of the top upright post 4 is equipped with second flange, the upper end connecting flange 22 and second of the middle standing pillar 3 Flange is connected;21 upper side of the cylinder is equipped with the gusset 23 for lifting, and the gusset 23 is equipped with lifting hole(eyelet);The column The side of body 21 is equipped with for installing from the first otic placode 24 for tearing sunpender 7 open, and the lower end level for tearing sunpender 7 open certainly is equipped with pin hole, Horizontal on first otic placode 24 to be equipped with through-hole corresponding with pin hole, the pin hole is interior equipped with the first axis pin with through-hole;In described Between column 3 structure it is identical as the bottom column 2.First, bottom column is fixed in the shaft of pedestal, how will be torn open certainly Downrod lower end is mounted on the first otic placode of bottom column, can be lifted middle standing pillar just by being mounted on the upper hoisting facilities of hook Position, is fixed the connecting flange of bottom column and middle standing pillar using bolt, then will tear sunpender open certainly and remove, and is installed to intermediate vertical On first otic placode of column side, continue that top upright post and split type pole arm lift in place, completes the whole peace of pole Dress.
Further, referring to Fig. 1, as a kind of specific implementation mode provided by the utility model from dismounting pole, The lifting mechanism 8 include be fixed on 2 side of bottom column support base 25, for Wound steel rope 9 reel 26 and be used for The driving part of reel 26, the reel 26 and driving part is driven to be arranged on support base 25, the driving part and volume Cylinder 26 is connected.The solderable rear portion for being fixed on bottom column of support base drives the spool of reel to rotate, in turn by driving part It realizes the retractable cable of steel wire rope, realizes the purpose of pole lifting weight.
Further, please refer to Fig.1,3, as it is provided by the utility model from dismount pole a kind of specific embodiment party Formula, the split type pole arm 12 include preceding lever arm 6 and rear lever arm 5, and first fixed pulley 13 and suspension hook 10 are arranged in front bar The front end of arm 6, the preceding lever arm 6 are connect with rear lever arm 5 by two the second axis pins 27, and the setting of the second fixed pulley 14 exists The rear end of lever arm 5 afterwards, the rear lever arm 5 are flexibly connected with top upright post 4.Split type pole arm and lifting mechanism are separately positioned on Each piece volumes of the front and rear part of top upright post, split type pole arm are small, and lifting is light, are more convenient installing and dismounting.
Further, referring to Fig. 1, as a kind of specific implementation mode provided by the utility model from dismounting pole, Support plate 28 is equipped on front side of the upper end of the top upright post 4, the middle and back and the upper end of support plate 28 of the rear lever arm 5 pass through two A third axis pin 29 connects.In the middle part of lever arm and rear portion is connected by third axis pin with the front and rear part of the upper end of support plate respectively afterwards, The rear end of lever arm is arranged in top upright post upper end afterwards, and fixation is supported to rear lever arm using support plate.
Further, referring to Fig. 3, as a kind of specific implementation mode provided by the utility model from dismounting pole, The rear end of the preceding lever arm 6 is symmetrical above and below to be equipped with the second otic placode 30, it is described after the front end of lever arm 5 symmetrical above and below be equipped with and the second ear The third otic placode 31 that plate 30 coordinates, middle part earhole of second axis pin 27 through the second otic placode 30 and third otic placode 31.
In addition, it is light in order to carry, bottom column, middle standing pillar and top upright post are all made of channel steel make-up pattern, shape At hollow structure, the pedestal 1, bottom column 2, middle standing pillar 3 and top upright post 4 are split structure, make each component weight Respectively less than 100kg, convenient for being accomplished manually handling operation.Meanwhile between the chassis and ground of pedestal connection, shaft first flange with It is connected between connection, bottom column and the connecting flange of middle standing pillar between the connecting flange of bottom column, the connection method of middle standing pillar Connection between blue and top upright post second flange is all made of high-strength bolt, makes connection safety and reliability.
The application process of the utility model is as follows:First, pedestal is fixed on the ground using bolt, by bottom column Connecting flange is connected and fixed with the first flange at the top of shaft, will tear first ear of the downrod lower end mounted on bottom column side open certainly On plate, the hoisting facilities such as bottle gouard moved by hands or electric hoist are suspended on from the hook torn open at the top of sunpender, using hoisting facilities will in Between column lifting installation in place;Then sunpender will be torn open certainly to remove, be installed on the first otic placode of the side of middle standing pillar, utilized Hoisting facilities are carried out lifting in place and be installed to top upright post and split type pole arm, to realize self peace of each position of pole Dress.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this All any modification, equivalent and improvement etc., should be included in the utility model made by within the spirit and principle of utility model Protection domain within.

Claims (10)

1. from dismounting pole, it is characterised in that:Including pedestal, bottom column, middle standing pillar and the top being sequentially connected from bottom to top Portion's column, one of the bottom column and the middle standing pillar side with tear open certainly sunpender cooperation be connected, it is described oneself tear open The hook for coordinating with hoisting facilities is equipped at the top of sunpender, the hook is arranged at the top of the top upright post, the bottom The rear portion of portion's column is equipped with lifting mechanism, and the top movable of the top upright post connects split type pole arm, described split type armful The front end of lever arm is equipped with the first fixed pulley and suspension hook, and the rear end of the split type pole arm is equipped with the second fixed pulley and setting exists The upper end of the top upright post, steel wire rope is wound in the lifting mechanism, and the outer end of the steel wire rope bypasses described second Fixed pulley, first fixed pulley are connected with the suspension hook.
2. as described in claim 1 from dismounting pole, it is characterised in that:The middle part of the pedestal is equipped with vertical with institute pedestal The shaft of axis coaxle, the upper end of the shaft are equipped with the first flange for being connected with the bottom column.
3. as claimed in claim 2 from dismounting pole, it is characterised in that:The bottom of the shaft is equipped with for being fixed with ground Chassis, the shaft is rotatably assorted with the chassis.
4. as claimed in claim 3 from dismounting pole, it is characterised in that:It is set in the shaft and is connected with the chassis Support cover.
5. as claimed in claim 4 from dismounting pole, it is characterised in that:Support cover side is equipped with link block, and described the One flange is connected with the link block by connecting pin.
6. as claimed in claim 2 from dismounting pole, it is characterised in that:The bottom column includes the company at cylinder and its both ends Acting flange, the upper end connecting flange of the bottom column are connected with the lower end connecting flange of middle standing pillar, the bottom column Lower end connecting flange is connected with the first flange of pedestal, and the lower end of the top upright post is equipped with second flange, the middle standing pillar Upper end connecting flange be connected with second flange;The cylinder upper side is equipped with the gusset for lifting, is set on the gusset There is lifting hole(eyelet);The side of the cylinder is equipped with described from the first otic placode for tearing sunpender open, the lower end water for tearing sunpender open certainly for installing Flat to be equipped with pin hole, level is equipped with through-hole corresponding with the pin hole on first otic placode, is set in the pin hole and the through-hole There is the first axis pin;The structure of the middle standing pillar is identical as the bottom column.
7. as described in claim 1 from dismounting pole, it is characterised in that:The lifting mechanism includes being fixed on bottom column side The support base in face, the driving part for the reel of Wound steel rope and for driving reel, the reel and the driving portion Part is arranged on the support base, and the driving part is connected with the reel.
8. as claim 1-7 any one of them dismounts pole certainly, it is characterised in that:The split type pole arm includes front bar Arm and rear lever arm, first fixed pulley and suspension hook are arranged in the front end of the preceding lever arm, and the preceding lever arm passes through with rear lever arm The rear end of lever arm in the rear is arranged in two the second axis pin connections, second fixed pulley, and the rear lever arm and the top are vertical Column is flexibly connected.
9. as claimed in claim 8 from dismounting pole, it is characterised in that:Support is equipped on front side of the upper end of the top upright post The middle and back of plate, the rear lever arm is connect with the upper end of the support plate by two third axis pins.
10. as claimed in claim 9 from dismounting pole, it is characterised in that:The rear end of the preceding lever arm is symmetrical above and below to be equipped with The front end of two otic placodes, the rear lever arm is symmetrical above and below equipped with the third otic placode coordinated with second otic placode, second axis pin Through the middle part earhole of second otic placode and the third otic placode.
CN201721788005.0U 2017-12-20 2017-12-20 From dismounting pole Active CN207699076U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201721788005.0U CN207699076U (en) 2017-12-20 2017-12-20 From dismounting pole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201721788005.0U CN207699076U (en) 2017-12-20 2017-12-20 From dismounting pole

Publications (1)

Publication Number Publication Date
CN207699076U true CN207699076U (en) 2018-08-07

Family

ID=63027087

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201721788005.0U Active CN207699076U (en) 2017-12-20 2017-12-20 From dismounting pole

Country Status (1)

Country Link
CN (1) CN207699076U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111792521A (en) * 2020-06-16 2020-10-20 深圳市兰锋科技有限公司 Mechanical hoisting device for building construction and use method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111792521A (en) * 2020-06-16 2020-10-20 深圳市兰锋科技有限公司 Mechanical hoisting device for building construction and use method

Similar Documents

Publication Publication Date Title
CN103086279B (en) Vertical transportation construction method for building construction
CN102359302B (en) Extra-high voltage large-span iron tower assembling method
CN206502579U (en) Power pole hoisting device
CN106241614B (en) A kind of shield machine assembly and dual-purpose gantry crane of slagging tap
CN106938824A (en) A kind of boom hoisting of electric equipment maintenance
WO2023082748A1 (en) Apparatus and method for vertically lifting and installing variable-diameter unbalanced-load device
CN207699076U (en) From dismounting pole
CN209797314U (en) adjustable assembled door-shaped frame for assembling and disassembling tower crane
CN107720569B (en) A kind of dismounting inner climbing crane tower is hung with masts type roofing
CN206288881U (en) A kind of tower crane counter-jib dumping device
JP2855014B2 (en) Disassembled jib crane
CN106429879A (en) Equipment hoisting device used on telegraph pole
CN208024056U (en) A kind of double flat arm ground type pole
CN206172840U (en) Fan cabin that this maintenance was hung is hung and uses in maintenance
CN205998901U (en) Tower crane and its gin-pole truck being used
CN212769539U (en) Universal portable maintenance lifting appliance for tower crane
CN206088822U (en) Equipment hoist device on wire pole
CN105883645B (en) The method for dismounting of tower crane attachment device
CN213569142U (en) High lifting machine of security for civil engineering
CN108726358A (en) A kind of towering concrete structure main reinforcement batch hanging apparatus and method
CN213294598U (en) Rotatable over-and-under type storage tank top cap is anticorrosive construction equipment in
CN206834616U (en) Hold in the palm line car in high-altitude
CN107253487A (en) Fold mountain region derrick car and detection folds mountain region derrick car
CN208200206U (en) A kind of boom hoisting used in culvert pipe
CN106744359A (en) The dumping device of tower crane counter-jib

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant