CN105540460B - A kind of arm crane is from jacking apparatus - Google Patents

A kind of arm crane is from jacking apparatus Download PDF

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Publication number
CN105540460B
CN105540460B CN201610059327.5A CN201610059327A CN105540460B CN 105540460 B CN105540460 B CN 105540460B CN 201610059327 A CN201610059327 A CN 201610059327A CN 105540460 B CN105540460 B CN 105540460B
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China
Prior art keywords
jacking
standard knot
frame
oil cylinder
pieces
Prior art date
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Active
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CN201610059327.5A
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Chinese (zh)
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CN105540460A (en
Inventor
张松华
徐侠松
张坤义
鄂志伟
金鹤翔
周立宏
李凯
朱云彪
詹卓斌
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Hubei Electric Power Transmission & Distribution Engineering Co Ltd
Zhejiang Construction Machinery Group Co Ltd
State Grid Corp of China SGCC
Original Assignee
Hubei Electric Power Transmission & Distribution Engineering Co Ltd
Zhejiang Construction Machinery Group Co Ltd
State Grid Corp of China SGCC
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Application filed by Hubei Electric Power Transmission & Distribution Engineering Co Ltd, Zhejiang Construction Machinery Group Co Ltd, State Grid Corp of China SGCC filed Critical Hubei Electric Power Transmission & Distribution Engineering Co Ltd
Priority to CN201610059327.5A priority Critical patent/CN105540460B/en
Publication of CN105540460A publication Critical patent/CN105540460A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00Cranes 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
    • B66C23/62Constructional features or details

Abstract

The present invention relates to a kind of arm crane from jacking apparatus, it belongs to hoisting machinery technical field.Structure of the present invention includes introducing platform, introduces dolly, basic chassis, standard knot, stock, jacking cushion cap and hydraulic climbing mechanism, basic chassis is connected with earth anchorage, standard knot is connected with basic chassis successively with stock, hydraulic cylinder is placed in inside standard knot, hydraulic cylinder lower end is connected with basic chassis, upper end is connected with jacking cushion cap, platform one end is introduced to be connected with basic chassis, one end is connected by pull bar with stock, introduce dolly to be placed on introduction platform, standard knot is positioned over to introduce and introduced on dolly;The jacking method of the present invention is climbed pawl for jacking cushion cap and contacted with standard knot step surface, completion jacking drop certainly of freely being stretched by hydraulic cylinder.The present invention it is simple and reasonable, be easily installed dismounting, jacking method stablize it is quick, jacking overall process terrestrial operation, no work high above the ground, securely and reliably, can be widely applied to all kinds of hoisting machineries.

Description

A kind of arm crane is from jacking apparatus
Technical field
Jacked the present invention relates to a kind of arm crane from jacking apparatus, specifically a kind of removable standard knot, subsurface With the arm crane built in oil cylinder from jacking apparatus, belong to hoisting machinery technical field.
Background technology
In general, the jacking cylinder of jacking apparatus is set to be unilateral in the prior art, i.e., only set in the one side of climbing support It is equipped with jacking cylinder, and the jacking process for the flexible completion climbing support for passing through the jacking cylinder.Due to only setting jacking in one side Oil cylinder, during the jacking of derrick crane, tower body force unbalance can be caused, cause jacking stability not strong, easily make Into accident.
Patent publication No. is CN203079590U, and publication date is that the Chinese patent of on 07 24th, 2013 discloses a kind of name Referred to as " a kind of derrick crane and its jacking apparatus ".The unilateral of climbing support of the prior art is set jacking cylinder by the patent It is improved to be symmetrical arranged jacking cylinder in climbing support both sides, although the device jacking cylinder both sides are arranged, climbing support stress balance, It will not be tilted because of force unbalance, but how bilateral oil cylinder realizes synchronization of jacking up, is a big difficult point of the technology, Do not referred in the patent, temporarily without effective way, therefore it still has drawbacks described above.
In consideration of it, how to design a kind of jacking apparatus, device stress balance during jacking, jacking stablize it is quick, Securely and reliably, be those skilled in the art be badly in need of at present solve technical problem
The content of the invention
The problem of existing for prior art, the present invention provide a kind of arm crane from jacking apparatus, and it can be realized Bilateral oil cylinder synchronization of jacking up, and the stress balance during jacking, jacking are stablized quick, and it is ground to jack overall process Operation, no work high above the ground, securely and reliably, the arm crane that can be widely applied for the construction site of all kinds of environment jack dress certainly Put.
To achieve the above object, the technical scheme is that:A kind of arm crane is from jacking apparatus, including introduces small Car, introduce platform, basic chassis, hydraulic lifting oil cylinder, jacking cushion cap, standard knot and stock;
The basic chassis is connected with the earth anchorage in the external world, and the standard knot and stock connect with the basic chassis successively Connect;
Hydraulic lifting oil cylinder is installed in the standard knot;
The hydraulic lifting oil cylinder lower end is connected with the basic chassis, the hydraulic lifting cylinder upper end and jacking cushion cap Connection;
Described introduction platform one end is connected with basic chassis, and the introduction platform other end is connected with the stock;
The introduction dolly is positioned on the introduction platform, and the standard knot is positioned on the introduction dolly and introduced.
Further, the basic chassis includes rood beam, standard knot bearing, stock bearing, the first oil cylinder seat and internal rails Road;
The end of rood beam four is provided with bracing wire hole, and first oil cylinder seat is located at the rood beam center;
The standard knot bearing and stock bearing are evenly arranged in the rood beam surrounding, institute centered on the first oil cylinder seat State inner tracks and be arranged in the first oil cylinder seat both sides.
Further, the standard knot includes standard knot U-shaped frame and standard knot monolithic;
Two secondary tracks are provided with the standard knot U-shaped frame, adapter sleeve and guide pad are installed in the standard knot U-shaped frame;
The standard knot monolithic is by three the 3rd horizontal web members, two the 3rd diagonal web members, an anti-torsion bar and six first companies Fishplate bar forms;
The joint face of the standard knot U-shaped frame position corresponding with the standard knot monolithic is drilled with seven through holes, and The standard knot U-shaped frame is connected with the standard knot monolithic by bolt or bearing pin.
Further, the stock include the second main chord, the 4th horizontal web member, the 4th diagonal web member, four the second connecting plates and Four directive wheels;
The lower end of two sides of stock is designed with standard knot and introduces opening, and four directive wheels are fixedly connected on institute State on the inside of stock, four connecting plates are fixedly connected on the second main chord lower end.
Further, the jacking cushion cap includes jacking frame, the second oil cylinder seat, climbs pawl and roller;
The jacking frame by two root long beams, two short beams, a middle cross beam, four the 5th diagonal web members, four pieces of guide plates and Eight pieces are climbed pawl engaging lug composition;
The long beam and short beam head and the tail are in turn connected to form frame, and the crossbeam is fixed on the centre of frame, four the described 5th The uniform cloth of diagonal web member is symmetrically distributed in Chang Liangshang two-by-two in inframe, four pieces of guide plates;
Pawl engaging lug is climbed described in eight pieces and one group and is fixedly installed in the frame surrounding two-by-two, second cylinder pedestal is located at Among the jacking frame, climb pawl engaging lug and be connected with and climb pawl, and eight rollings are installed on every piece of guide plate Wheel.
Further, the introduction platform includes two introduction tracks, two first horizontal web members, the second diagonal web member, one The outer crossbeam of root, two pieces of gussets, two pieces of otic placodes, two pull bars and two regulation lever apparatus;
The first horizontal web member and the first diagonal web member are welded in the introduction track lower surface;The outer crossbeam is welded in introduction rail Road outer end, the gusset are connected with introducing track and outer crossbeam respectively, and the otic placode is welded in outer crossbeam both ends;
One end of the pull bar is connected with otic placode, and the other end of pull bar is connected with regulation lever apparatus.
Further, the regulation lever apparatus includes two pieces of connection otic placodes, a screw rod, a nut and one piece of connecting plate;
Through hole is drilled with the connecting plate, described screw rod one end is connected through the through hole with nut, and the screw rod other end is welded in Among two pieces of connection otic placodes.
Further, the introduction dolly includes trolley frame and four are introduced wheel;
Four wheels of introducing are fixed on trolley frame;
The trolley frame is stood by two girders, two root long braces, two short braces, two crossbeams, four pieces of supporting plates, four Post, ten pieces of gussets and four multi-diameter shafts are welded.
A kind of arm crane comprises the following steps from the jacking method of jacking apparatus, the jacking method:
1) pawl of climbing for jacking cushion cap contacts with standard knot step surface, controls hydraulic lifting oil cylinder freely to stretch by flow speed control valve Contracting;
2) the hydraulic lifting oil cylinder is positioned between basic chassis and the jacking cushion cap, by positive flow speed control valve and instead To the advance and retreat speed of the hydraulic oil in flow speed control valve control cylinder working oil path, so as to realize the jacking of oil cylinder.
Further, for the jacking method when introducing standard knot, standard knot is split as standard knot U-shaped frame and standard knot list Piece,
Wherein, standard knot U-shaped frame be positioned over introduce dolly on and from front introduce, standard knot monolithic from the back side introduce again with Standard knot U-shaped frame connects.
The beneficial effects of the invention are as follows:1st, arm crane is formed by connecting from climbing structure by the manufacture of metal steel, respectively Part is connected by bolt or bearing pin, is easily installed, is dismantled, convenient transportation, is repeated and is recycled;2nd, overall process ground is jacked Operation, no work high above the ground, securely and reliably;3rd, the inventive method is to be jacked in ground, and often plus a section standard knot, jacking only need one Stroke can greatly reduce the time that jacking process is spent, improve operating efficiency to greatest extent in place;4th, top of the invention Oil-lifting jar is single cylinder, and is internal jacking, and jacking process is steady, avoids the asynchronous hidden danger brought of double cylinder jackings.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the embodiment of the present invention;
Fig. 2 is the structural representation that dolly is introduced in the embodiment of the present invention;
Fig. 3 is the structural representation that platform is introduced in the embodiment of the present invention;
Fig. 4 is the structural representation of basic chassis in the embodiment of the present invention;
Fig. 5 is the structural representation of Plays section of the embodiment of the present invention;
Fig. 6 is the structural representation of Plays section U-shaped frame of the embodiment of the present invention;
Fig. 7 is the structural representation of Plays section monolithic of the embodiment of the present invention;
Fig. 8 is the structural representation that cushion cap is jacked in the embodiment of the present invention;
Fig. 9 is the structural representation of stock in the embodiment of the present invention;
In figure:Ith, dolly is introduced, II, introduce platform, III, basic chassis, IV, hydraulic lifting oil cylinder, V, jacking cushion cap, VI, stock, VII, standard knot, VIII, standard knot U-shaped frame, IX, standard knot monolithic, 1, introduce wheel, 2, girder, 3, long diagonal brace, 4, Short brace, 5, crossbeam, 6, supporting plate, 7, column, 8, gusset, 9, multi-diameter shaft, 10, introduce track, the 11, first horizontal web member, 12, the One diagonal web member, 13, outer crossbeam, 14, gusset, 15, small ear plate, 16, big ear plate, 17, pull bar, 18, regulation lever apparatus, 19, cross Beam, 20, standard knot bearing, 21, stock bearing, the 22, first oil cylinder seat, 23, inner tracks, 24, bracing wire hole, the 25, first main string Bar, the 26, second horizontal web member, the 27, second diagonal web member, 28, guide rail, 29, gusset plate, 30, mark time, 31, adapter sleeve, 32, guide pad, 33rd, the 3rd horizontal web member, the 34, the 3rd diagonal web member, 35, anti-torsion bar, the 36, first connecting plate, the 37, second oil cylinder seat, 38, climb pawl, 39, Roller, 40, Chang Liang, 41, short beam, 42, middle cross beam, the 43, the 5th diagonal web member, 44, guide plate, 45, climb pawl engaging lug, 46, second Main chord, the 47, the 4th horizontal web member, the 48, the 4th diagonal web member, the 49, second connecting plate, 50, directive wheel.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes.Obviously, described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made Embodiment, belong to the scope of protection of the invention.
As shown in figure 1, a kind of arm crane is from jacking apparatus, including introduces dolly I, enter platform II, basic chassis IIIth, hydraulic lifting oil cylinder IV, jacking cushion cap V, stock VI and standard knot VII.Basic chassis III is connected with the earth anchorage in the external world, Standard knot VII is connected with basic chassis III successively with stock VI, and hydraulic lifting oil cylinder IV is placed in VII inside standard knot;Hydraulic top The lower end of oil-lifting jar IV is connected with basic chassis III, and upper end is connected with jacking cushion cap V, is introduced the one end of platform II and is connected with basic chassis Connect, the other end is connected by pull bar with stock VI, is introduced dolly I and is placed on introduction platform II, standard knot VII is positioned over introduction Introduced on dolly I.
As shown in Figure 2:Introducing dolly I includes a trolley frame and four introduction wheels 1.Trolley frame is by two girders 2, two 3, two short 5, four pieces of the crossbeam of brace 4, two supporting plate 6, four, 7, ten pieces of the column gusset 8 of long diagonal brace and four multi-diameter shafts 9 weld Connect and form, four introduction wheels 1 and four multi-diameter shafts 9 are sequentially connected and are fixed on trolley frame.
As shown in figure 3, the figure is to introduce the overall structure of platform II.Introducing platform II includes two 10, two, introduction tracks First horizontal outer 13, two pieces of crossbeam, 14, two pieces of gusset, 15, four pieces of big ear plates of small ear plate of 11, first diagonal web members 12, one of web member 16th, two pull bars 17 and two regulation lever apparatus 18.The first horizontal diagonal web member 12 of web member 11 and first, which is welded in, introduces the following table of track 10 Face, outer crossbeam 13, which is welded in, introduces the outer end of track 10, and gusset 14 is connected with introducing track 10 and outer crossbeam 13 respectively, and small ear plate 15 welds In the outer both ends of crossbeam 13, one end of pull bar 17 is connected with small ear plate 15, and the other end of pull bar 17 is connected with regulation lever apparatus 18.
As shown in figure 4, the overall structure of chassis III based on the figure.Basic chassis III mainly includes rood beam 19, standard knot Bearing 20, stock bearing 21, the first oil cylinder seat 22 and inner tracks 23.The end of rood beam 19 4 is provided with bracing wire hole 24, the first oil cylinder Seat 22 is located at rood beam center, standard knot bearing 20 and stock bearing 21 and is distributed in rood beam 19 centered on the first oil cylinder seat 22 Surrounding, inner tracks 23 are distributed in the both sides of the first oil cylinder seat 22.
As shown in figure 5, the figure is standard knot VII overall structures, standard knot VII includes standard knot U-shaped frame VIII and standard Save monolithic IX.
As shown in fig. 6, the figure is standard knot U-shaped frame VIII structures.Standard knot U-shaped frame VIII is by four first main chords 25th, nine second horizontal web members 26,27 and two secondary guide rail 28 of the second diagonal web member of the six roots of sensation form.First main chord and the first main chord it Between upper, middle and lower by gusset plate 29 or mark time and 30 be sequentially connected three second horizontal web members 26 and two second diagonal web members 27, two is secondary Track 28 is symmetrically welded on the inside of standard knot U-shaped frame VIII, and four adapter sleeves 31, upper end are respectively welded in standard knot U-shaped frame VIII both ends Provided with six guide pads 32.
As shown in fig. 7, the figure is standard knot monolithic IX structures.Standard knot monolithic is by three the 3rd horizontal web members 33, two piece The three anti-torsion bars 35 of diagonal web member 34, one and six piece of first connecting plate 36 form, standard knot U-shaped frame VIII joint faces and standard knot list Piece IX is drilled with seven through holes in relevant position, and standard knot U-shaped frame is connected with standard knot monolithic by bolt or bearing pin.
As shown in figure 8, the figure is jacking cushion cap V overall structures.Jacking cushion cap V includes a jacking frame, second oil Cylinder seat 37, four climbs pawl 38 and 32 rollers 39.Jacking frame by 40, two, two root long beam short beam 41, one middle cross beam 42, Four the 5th diagonal web members, 43, four pieces of guide plates 44 and eight pieces are climbed pawl engaging lug 45 and formed.Long beam 40 and short beam 41 successively head and the tail phase Company is welded into frame, and crossbeam 42 is welded in frame middle, and four diagonal web members 43 are distributed on inframe portion, four pieces of guide plates 44 symmetrical cloth two-by-two In on long beam 40, climb pawl engaging lug 45 for eight pieces and be welded in frame surrounding for one group two-by-two, the second oil cylinder seat 37 is located at jacking frame middle, climbed Pawl 38 is flexibly connected with climbing pawl engaging lug 45, and eight rollers 39 are installed on every piece of guide plate.
As shown in figure 9, the figure is stock VI overall structures.Stock VI includes four second main chords 46, (4N-4) root the Four horizontal web members 47,48, four piece of second connecting plate 49 of the 4th diagonal web member of (8N-16) root and four directive wheels 50 form.Before stock VI Two sides lower end is provided with standard knot and introduces opening afterwards, and four directive wheels 50 are welded on the inside of stock VI upper ends, and four pieces of connecting plates 49 weld In four main chord lower ends.Wherein (N >=4,5) N is chosen in the present embodiment.
A kind of arm crane comprises the following steps from the jacking method of jacking apparatus, the jacking method:
1) pawl of climbing for jacking cushion cap contacts with standard knot step surface, controls hydraulic lifting oil cylinder freely to stretch by flow speed control valve Contracting;
2) the hydraulic lifting oil cylinder is positioned between basic chassis and the jacking cushion cap, by positive flow speed control valve and instead To the advance and retreat speed of the hydraulic oil in flow speed control valve control cylinder working oil path, so as to realize the jacking of oil cylinder.
Further, for the jacking method when introducing standard knot, standard knot is split as standard knot U-shaped frame and standard knot list Piece,
Wherein, standard knot U-shaped frame be positioned over introduce dolly on and from front introduce, standard knot monolithic from the back side introduce again with Standard knot U-shaped frame connects.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts and components, it is named Title etc. can be different, and the above content described in this specification is only to structure example explanation of the present invention.It is all according to The equivalence changes or simple change done according to the construction described in inventional idea of the present invention, feature and principle, are included in this hair In the protection domain of bright patent.Those skilled in the art can do various to described specific embodiment The modification of various kinds or supplement are substituted using similar mode, without departing from structure of the invention or surmount present claims Scope defined in book, protection scope of the present invention all should be belonged to.

Claims (7)

1. a kind of arm crane is from jacking apparatus, it is characterised in that:Including introducing dolly, introducing platform, basic chassis, hydraulic pressure Jacking cylinder, jacking cushion cap, standard knot and stock;
The basic chassis is connected with the earth anchorage in the external world, and the standard knot and stock are connected with the basic chassis successively;
Hydraulic lifting oil cylinder is installed in the standard knot;
The hydraulic lifting oil cylinder lower end is connected with the basic chassis, and the hydraulic lifting cylinder upper end connects with jacking cushion cap Connect;
Described introduction platform one end is connected with basic chassis, and the introduction platform other end is connected with the stock;
The introduction dolly is positioned on the introduction platform, and the standard knot is positioned on the introduction dolly and introduced;
The standard knot includes standard knot U-shaped frame and standard knot monolithic;
Two secondary tracks are provided with the standard knot U-shaped frame, adapter sleeve and guide pad are installed in the standard knot U-shaped frame;
The standard knot monolithic is by three the 3rd horizontal web members, two the 3rd diagonal web members, an anti-torsion bar and six the first connecting plates Composition;
The joint face of the standard knot U-shaped frame position corresponding with the standard knot monolithic is drilled with seven through holes, and described Standard knot U-shaped frame is connected with the standard knot monolithic by bolt or bearing pin;
The jacking cushion cap includes jacking frame, the second oil cylinder seat, climbs pawl and roller;
The jacking frame is by two root long beams, two short beams, a middle cross beam, four the 5th diagonal web members, four pieces of guide plates and eight pieces Climb pawl engaging lug composition;
The long beam is in turn connected to form frame with short beam head and the tail, and the crossbeam is fixed on the centre of frame, four the 5th oblique abdomens The uniform cloth of bar is symmetrically distributed in Chang Liangshang two-by-two in inframe, four pieces of guide plates;
Pawl engaging lug is climbed described in eight pieces and one group and is fixedly installed in the frame surrounding two-by-two, second cylinder pedestal is positioned at described Among jacking frame, climb pawl engaging lug and be connected with and climb pawl, and eight rollers are installed on every piece of guide plate.
2. a kind of arm crane according to claim 1 is from jacking apparatus, it is characterised in that:The basic chassis includes Rood beam, standard knot bearing, stock bearing, the first oil cylinder seat and inner tracks;
The end of rood beam four is provided with bracing wire hole, and first oil cylinder seat is located at the rood beam center;
The standard knot bearing and stock bearing are evenly arranged in the rood beam surrounding centered on the first oil cylinder seat, described interior Portion's track is arranged in the first oil cylinder seat both sides.
3. a kind of arm crane according to claim 1 is from jacking apparatus, it is characterised in that:The stock includes second Main chord, the 4th horizontal web member, the 4th diagonal web member, four the second connecting plates and four directive wheels;
The lower end of two sides of stock is designed with standard knot and introduces opening, and four directive wheels are fixedly connected on the set On the inside of frame, four connecting plates are fixedly connected on the second main chord lower end.
4. a kind of arm crane according to claim 1 is from jacking apparatus, it is characterised in that:The introduction platform includes Two introduction tracks, two first horizontal web members, second diagonal web member, an outer crossbeam, two pieces of gussets, two pieces of otic placodes, two Pull bar and two regulation lever apparatus;
The first horizontal web member and the first diagonal web member are welded in the introduction track lower surface;The outer crossbeam, which is welded in, to be introduced outside track End, the gusset are connected with introducing track and outer crossbeam respectively, and the otic placode is welded in outer crossbeam both ends;
One end of the pull bar is connected with otic placode, and the other end of pull bar is connected with regulation lever apparatus.
5. a kind of arm crane according to claim 4 is from jacking apparatus, it is characterised in that:The regulation lever apparatus bag Include two pieces of connection otic placodes, a screw rod, a nut and one piece of connecting plate;
Through hole is drilled with the connecting plate, described screw rod one end is connected through the through hole with nut, and the screw rod other end is welded in two pieces Among connection otic placode.
6. a kind of arm crane according to claim 1 is from jacking apparatus, it is characterised in that:The introduction dolly includes Trolley frame and four introduction wheels;
Four wheels of introducing are fixed on trolley frame;
The trolley frame by two girders, two root long braces, two short braces, two crossbeams, four pieces of supporting plates, four columns, Ten pieces of gussets and four multi-diameter shafts are welded.
7. a kind of arm crane based on described in claim 1 is from the jacking method of jacking apparatus, it is characterised in that the jacking Method comprises the following steps:
1) pawl of climbing for jacking cushion cap contacts with standard knot step surface, controls hydraulic lifting oil cylinder freely to stretch by flow speed control valve;
2) the hydraulic lifting oil cylinder is positioned between basic chassis and the jacking cushion cap, passes through positive flow speed control valve and reverse tune The advance and retreat speed of hydraulic oil in fast valve control cylinder working oil path, so as to realize the jacking of oil cylinder;
For the jacking method when introducing standard knot, standard knot is split as standard knot U-shaped frame and standard knot monolithic,
Wherein, standard knot U-shaped frame be positioned over introduce dolly on and from front introduce, standard knot monolithic from the back side introduce again with standard Save U-shaped frame connection.
CN201610059327.5A 2016-01-28 2016-01-28 A kind of arm crane is from jacking apparatus Active CN105540460B (en)

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Publication number Priority date Publication date Assignee Title
CN106744367B (en) * 2016-12-09 2018-07-31 徐州建机工程机械有限公司 A kind of jacking of tower crane is from introducing equipment, system and control method
CN108128714B (en) * 2017-12-13 2019-05-14 江麓机电集团有限公司 A kind of derrick crane introduction platform safety protective device
CN111706149A (en) * 2020-05-29 2020-09-25 浙江省建设机械集团有限公司 Construction method of novel assembled holding pole

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