CN105564971A - Pipe mold transition line for pipe pile automatic production line - Google Patents

Pipe mold transition line for pipe pile automatic production line Download PDF

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Publication number
CN105564971A
CN105564971A CN201610112694.7A CN201610112694A CN105564971A CN 105564971 A CN105564971 A CN 105564971A CN 201610112694 A CN201610112694 A CN 201610112694A CN 105564971 A CN105564971 A CN 105564971A
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CN
China
Prior art keywords
conveyer
pipe
automatic production
line
production line
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Granted
Application number
CN201610112694.7A
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Chinese (zh)
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CN105564971B (en
Inventor
周兆弟
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Zhejiang Zhaodi Technology Co.,Ltd.
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周兆弟
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G47/00Article or material-handling devices associated with conveyors; Methods employing such devices
    • B65G47/52Devices for transferring articles or materials between conveyors i.e. discharging or feeding devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00Methods or machines specially adapted for the production of tubular articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G37/00Combinations of mechanical conveyors of the same kind, or of different kinds, of interest apart from their application in particular machines or use in particular manufacturing processes
    • B65G37/005Combinations of mechanical conveyors of the same kind, or of different kinds, of interest apart from their application in particular machines or use in particular manufacturing processes comprising two or more co-operating conveying elements with parallel longitudinal axes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/02Articles
    • B65G2201/0214Articles of special size, shape or weigh

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Abstract

The invention belongs to the technical field of buildings, and relates to a pipe mold transition line for a pipe pile automatic production line. The pipe mold transition line comprises multiple conveyors linearly arranged and with overlapped axes; conveying gaps are formed between every two adjacent conveyors; bases are arranged below the conveyors; the conveyors are mounted on the bases, and are movably connected with the bases; the bases are fixed with lifting mechanisms capable of lifting in the vertical direction; the tops of the lifting mechanisms are fixedly connected with the conveyors; and when the lifting mechanisms are lifted in the vertical direction, the conveyors and the lifting mechanisms are synchronously lifted. The pipe mold transition line increases the conveying height through jacking a conveying line in the pipe mold or pipe pipe conveying process, avoids from interference of other conveying lines, and is convenient to produce independent conveying networks.

Description

For the pipe die transition line of automatic production line for pipe pile
Technical field
The invention belongs to technical field of buildings, relate to a kind of pipe die transition line for automatic production line for pipe pile, in automatic production line for pipe pile, pile tube or pipe die are carried.
Background technology
Pile tube is important pile foundation material, also be important cement products, compared with general foundation work, there is the advantages such as piling quality is good, construction is fast, engineering geology strong adaptability, be widely used in all kinds of building with on the foundation work constructed, as the field such as skyscraper, public building, general industry and civil construction, harbour, harbour, express highway, bridge, heavy machine tool, warehouse, shore protection.Pile tube in process of production, need, through steps such as cloth, matched moulds, centrifugal, steam-cured, the demouldings, to need to carry pile tube or pipe die between each step, usually undertaken by driving or crane, therefore constrains the automated production of pile tube by existing conveying.
Chinese patent literature discloses a kind of pile for prestressed pipe manufacturing line [application number: 201120300555.X], comprises for making cage muscle, and the cage muscle that head plate, tailgate, cage muscle are assembled into together is made district; Being arranged on described cage muscle makes on side, district, for the cage made muscle is assembled to bed die Shang Zhuanlong district; Described cage muscle makes between district and described Zhuan Long district and is provided with pipe die conveyor group; Be arranged on side, described Zhuan Long district, to the cover mold district clearing up and carry cover mold after taking off cover mold; Be arranged on described Zhuan Long district and cage muscle makes between district, cover mold and bed die carried out to the mould closing section of matched moulds, between described cover mold district and mould closing section, be provided with pipe die conveyor group; Being arranged on described cage muscle makes on district's opposite side, to the Tai Qian cloth district of the mould cloth after matched moulds; Be arranged on the centrifugal forming district on side, described Tai Qian cloth district; Be arranged on the steam-cured district on side, described centrifugal forming district; Be arranged on the form removal district on side, described steam-cured district, described form removal district is arranged on described side, cover mold district; Be arranged on the steam pressure district on described form removal district opposite side.
Such scheme also discloses jack and jacking translation machine; but from content disclosed in it; be only limitted to pipe die or pile tube jack-up thus do not affect other chain making machines, that is the not open how jacking of jack and jacking translation machine carry the concrete structure of pipe die.
Summary of the invention
The object of the invention is for the problems referred to above, the pipe die transition line for automatic production line for pipe pile of a kind of convenient conveying pile tube or pipe die is provided.
For achieving the above object, present invention employs following technical proposal: a kind of pipe die transition line for automatic production line for pipe pile, comprise some being arranged in a linear and the conveyer of axial line coincidence, between every two adjacent conveyers, there is conveying breach, below conveyer, there is base, described conveyer to be arranged on base and to be flexibly connected with base, described base is fixed with lifting mechanism that an energy is elevated at vertical direction and the top of lifting mechanism is fixedly connected with conveyer, when lifting mechanism is vertically elevated, described conveyer and lifting mechanism synchronization lifting.
Above-mentioned in the pipe die transition line of automatic production line for pipe pile, described lifting mechanism comprises lifting assembly that two energy are elevated along vertical direction and lifting assembly is positioned at the two ends of base, and described base is provided with an elevation synchro drive that two lifting assembly rising or falling speeds can be made synchronous when two lifting assemblies liftings.
Above-mentioned in the pipe die transition line of automatic production line for pipe pile, described elevation synchro drive comprise fixing on a conveyor and with conveyer be rotationally connected and in horizontally disposed synchronizing shaft, the two ends of described synchronizing shaft drive with two lifting assemblies respectively and connect thus another lifting assembly can be driven to be elevated when one of them lifting assembly rising or falling speed is greater than the rising or falling speed of another lifting assembly thus make the rising or falling speed of two lifting assemblies synchronous.
Above-mentioned in the pipe die transition line of automatic production line for pipe pile, described elevation synchro drive comprises some guideposts being fixed on base two ends, the outer wall of described guidepost is provided with groove, synchronizing shaft is fixed with some gear and gear engage with the groove on guidepost one to one with guidepost.
Above-mentioned in the pipe die transition line of automatic production line for pipe pile, described synchronizing shaft has two and is arranged on conveyer both sides, and the both sides of each lifting assembly are respectively equipped with a guidepost.
Above-mentioned in the pipe die transition line of automatic production line for pipe pile, described conveyer is fixed with some orienting sleeves and orienting sleeve and guidepost are socketed and coordinate and can move up and down along guidepost.
Above-mentioned in the pipe die transition line of automatic production line for pipe pile, described conveyer comprise load-transfer device and on the conveyor belt equally spaced be fixed with some with load-transfer device synchronizing moving and outstanding conveyor belt surface thus can with the transport trolley of the object contact on load-transfer device.
Above-mentioned in the pipe die transition line of automatic production line for pipe pile, described load-transfer device both sides are respectively equipped with the guide rail that extends to load-transfer device two ends, and the both sides of described transport trolley are connected to a roller and roller is pressed on to roll on guide rail and with guide rail and is connected.
Above-mentioned in the pipe die transition line of automatic production line for pipe pile, described lifting assembly top is fixedly connected with jacking seat and jacking seat is fixedly connected with conveyer, described orienting sleeve is fixed on jacking seat, described jacking seat is also fixed with bearing seat, and synchronizing shaft to be inserted in bearing seat and to be rotationally connected with bearing seat.
Above-mentioned in the pipe die transition line of automatic production line for pipe pile, described conveyer also comprise conveying support and to be fixed on conveying support and with the transmission shaft that is rotationally connected of conveying support, described transmission shaft is connected with load-transfer device, the energy driving conveying belt axial rotation when drive axis, described lifting mechanism is fixedly connected with conveying support, and some conveyers share a driver train and the mouth of driver train connects the transmission shaft on conveyer with driving band.
Compared with prior art, the invention has the advantages that: in pipe die or pile tube course of conveying, improve delivery head by jacking travel line, circumvent the interference of other travel lines, be convenient to make separate transport net; Elevation synchro drive ensure that the reliable and stable of course of conveying.
Accompanying drawing explanation
Fig. 1 is structural representation provided by the invention;
Fig. 2 is the structural representation of conveyer;
Fig. 3 is the another kind of structural representation of conveyer;
Fig. 4 is the structural representation in another direction of Fig. 3;
Fig. 5 is the structural representation in another direction of Fig. 3.
In figure: conveyer 1, base 2, lifting mechanism 3, lifting assembly 4, elevation synchro drive 5, synchronizing shaft 6, guidepost 7, gear 8, orienting sleeve 9, load-transfer device 10, transport trolley 11, guide rail 12, roller 13, jacking seat 14, bearing seat 15, conveying support 16, driver train 17, transmission shaft 18, pipe die 100, running wheel circle 101, mouth 102 of stepping down.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
As shown in Figure 1 and Figure 5, a kind of pipe die transition line for automatic production line for pipe pile, comprise some being arranged in a linear and the conveyer 1 of axial line coincidence, between every two adjacent conveyers 1, there is mouth 102 of stepping down, there is below conveyer 1 base 2, described conveyer 1 to be arranged on base 2 and to be flexibly connected with base 2, described base 2 is fixed with lifting mechanism 3 that an energy is elevated at vertical direction and the top of lifting mechanism 3 is fixedly connected with conveyer 1, when lifting mechanism 3 is vertically elevated, described conveyer 1 and lifting mechanism 3 synchronization lifting.
Conveyer 1 is prior art, can adopt chain-linked conveyer, belt conveyer or conveyor screw.In the present embodiment, again shown in composition graphs 4, described conveyer 1 also comprise conveying support 16 and to be fixed on conveying support 16 and with the transmission shaft 18 that is rotationally connected of conveying support 16, described transmission shaft 18 is connected with load-transfer device 10, energy driving conveying belt 10 axial rotation when transmission shaft 18 rotates, described lifting mechanism 3 is fixedly connected with conveying support 16, some conveyers 1 share a driver train 17 and the mouth of driver train 17 connects the transmission shaft 18 on conveyer 1 with driving band, thus make all conveyers 1 can synchronous axial system, the speed on every bar conveyer 1 of pile tube or pipe die is identical, course of conveying keeps stable.Wherein, driver train 17 can select motor or hydraulic unit driver, and transmission shaft 18 can above fixed chain wheels or other tensioner thus transmission shaft 18 can be rotated by driving conveying belt 10.Load-transfer device 10 can be chain-type, rolling roll-type, belt etc.
It will be appreciated by those skilled in the art that in the present embodiment also can be some active conveyers add some passive conveyers with the use of.Passive conveyer is the conveyer not establishing driver train.
As shown in Figure 2, lifting mechanism 3 comprises lifting assembly 4 that two energy are elevated along vertical direction and lifting assembly 4 is positioned at the two ends of base 2, and described base 2 is provided with an elevation synchro drive 5 that two lifting assembly 4 rising or falling speeds can be made when two lifting assemblies 4 are elevated synchronous.Lifting assembly 4 can be the actuator of hydraulic unit driver, motor or turbine and worm structure, certainly, is preferably hydraulic unit driver.
Again shown in composition graphs 3, elevation synchro drive 5 comprise be fixed on conveyer 1 and with conveyer 1 be rotationally connected and in horizontally disposed synchronizing shaft 6, the two ends of described synchronizing shaft 6 drive with two lifting assemblies 4 respectively and connect thus another lifting assembly 4 can be driven to be elevated when one of them lifting assembly 4 rising or falling speed is greater than the rising or falling speed of another lifting assembly 4 thus make the rising or falling speed of two lifting assemblies 4 synchronous.Such as, synchronizing shaft 6 two ends are fixedly connected with the mouth of lifting assembly 4 respectively, are rotationally connected or are fixedly connected with, thus synchronizing shaft 6 is played pull the effect of lifting assembly 4 synchronization lifting at two ends in the middle part of synchronizing shaft 6 with conveying support 16.
As preferred scheme, elevation synchro drive 5 comprises some guideposts 7 being fixed on base 2 two ends, the outer wall of described guidepost 7 is provided with groove, groove can be made with file or other processing works, guidepost 7 outer wall is made to form spline-simulating structure, synchronizing shaft 6 is fixed with some gear 8 and gear 8 engage with the groove on guidepost 7 one to one with guidepost 7, the engagement system of gear 8 and the actual formative gear of guidepost 7 and tooth bar, because synchronizing shaft 6 is horizontally disposed with, therefore the gear 8 at synchronizing shaft 6 two ends also can synchronization lifting, and gear 8 pairs of lifting assemblies 4 play and pull or impetus, force the lifting assembly 4 energy synchronization lifting at base 2 two ends, therefore load-transfer device 10 is in plateau in the course of the work, object on load-transfer device 10 is as pipe die, pile tubes etc. also can steadily be carried.
More preferably, synchronizing shaft 6 has two and is arranged on conveyer 1 both sides, and the both sides of each lifting assembly 4 are respectively equipped with a guidepost 7.Conveyer 1 is fixed with some orienting sleeves 9 and orienting sleeve 9 and guidepost 7 are socketed and coordinate and can move up and down along guidepost 7.
Conveyer 1 comprise load-transfer device 10 and on load-transfer device 10 equally spaced be fixed with some with load-transfer device 10 synchronizing moving and outstanding load-transfer device 10 surface thus can with the transport trolley 11 of the object contact on load-transfer device 10, the shape matched with the surface of pipe die or pile tube can be made in transport trolley 11 top.When carrying pipe die with load-transfer device 10, as everyone knows, pipe die 100 surface is equally spaced has running wheel circle or rib circle, and the position of transport trolley 11 coordinates with running wheel circle 101 or rib circle just, thus makes course of conveying more reliable and more stable.
Transport trolley 11 can be driven smoothly to make load-transfer device 10, load-transfer device 10 both sides are respectively equipped with the guide rail 12 that extends to load-transfer device 10 two ends, and the both sides of described transport trolley 11 are connected to a roller 13 and roller 13 is pressed on to roll on guide rail 12 and with guide rail 12 and is connected.
Individual in the present embodiment, lifting assembly 4 top is fixedly connected with jacking seat 14 and jacking seat 14 is fixedly connected with conveyer 1, described orienting sleeve 9 is fixed on jacking seat 14, described jacking seat 14 is also fixed with bearing seat 15, and synchronizing shaft 6 to be inserted in bearing seat 15 and to be rotationally connected with bearing seat 15.
Principle of work of the present invention is:
This transition line, can at the travel line placing other in mouth 102 of stepping down, thus form crisscross transport net structure, pipe die 100 or pile tube are in course of conveying, make separately between the travel line of vertical and horizontal not produce interference, just need the problem solving space, the present invention is elevated by lifting mechanism 3 driving conveying belt 10, thus form the effect of three-dimensional conveying, when the two ends of load-transfer device 10 and other travel lines near time, only need with lifting mechanism 3 by load-transfer device 10 jack-up, the object on load-transfer device 10 can not produce interference to other travel line.
Due to the steady travel line that pipe die or pile tube need to be the level of state in course of conveying; otherwise can beat; all damage can be produced to pile tube and travel line; therefore; travel line 10 two ends when being elevated are kept to be synchronously key problem in technology; the present invention gives lifting assembly 4 one power by the gear 8 at synchronizing shaft 6 two ends, thus makes two lifting assembly 4 synchronization liftings, also just ensure that the horizontality of load-transfer device 10.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although more employ conveyer 1, base 2, lifting mechanism 3, lifting assembly 4, elevation synchro drive 5, synchronizing shaft 6, guidepost 7, gear 8, orienting sleeve 9, load-transfer device 10, transport trolley 11, guide rail 12, roller 13, jacking seat 14, bearing seat 15, conveying support 16, driver train 17, transmission shaft 18, pipe die 100, running wheel circle 101, the terms such as mouth 102 of stepping down herein, do not get rid of the possibility using other term.These terms are used to be only used to describe and explain essence of the present invention more easily; The restriction that they are construed to any one additional is all contrary with spirit of the present invention.

Claims (10)

1. the pipe die transition line for automatic production line for pipe pile, comprise some being arranged in a linear and the conveyer (1) of axial line coincidence, it is characterized in that, between every two adjacent conveyers (1), there is mouth of stepping down (102), conveyer (1) below has base (2), described conveyer (1) is arranged on base (2) and goes up and be flexibly connected with base (2), described base (2) is fixed with lifting mechanism (3) that an energy is elevated at vertical direction and the top of lifting mechanism (3) is fixedly connected with conveyer (1), when lifting mechanism (3) is vertically elevated, described conveyer (1) and lifting mechanism (3) synchronization lifting.
2. the pipe die transition line for automatic production line for pipe pile according to claim 1, it is characterized in that, described lifting mechanism (3) comprises lifting assembly (4) that two energy are elevated along vertical direction and lifting assembly (4) is positioned at the two ends of base (2), and described base (2) is provided with an elevation synchro drive (5) that two lifting assembly (4) rising or falling speeds can be made synchronous when two lifting assemblies (4) liftings.
3. the pipe die transition line for automatic production line for pipe pile according to claim 2, it is characterized in that, described elevation synchro drive (5) comprise be fixed on conveyer (1) upper and with conveyer (1) be rotationally connected and in horizontally disposed synchronizing shaft (6), the two ends of described synchronizing shaft (6) drive with two lifting assemblies (4) respectively and connect thus another lifting assembly (4) can be driven when one of them lifting assembly (4) rising or falling speed is greater than the rising or falling speed of another lifting assembly (4) to be elevated thus make the rising or falling speed of two lifting assemblies (4) synchronous.
4. the pipe die transition line for automatic production line for pipe pile according to claim 3, it is characterized in that, described elevation synchro drive (5) comprises some guideposts (7) being fixed on base (2) two ends, the outer wall of described guidepost (7) is provided with groove, synchronizing shaft (6) is fixed with some gear (8) and gear (8) engage with the groove on guidepost (7) one to one with guidepost (7).
5. the pipe die transition line for automatic production line for pipe pile according to claim 4, it is characterized in that, described synchronizing shaft (6) has two and is arranged on conveyer (1) both sides, and the both sides of each lifting assembly (4) are respectively equipped with a guidepost (7).
6. the pipe die transition line for automatic production line for pipe pile according to claim 3 or 4 or 5, it is characterized in that, described conveyer (1) is fixed with some orienting sleeves (9) and orienting sleeve (9) and guidepost (7) are socketed and coordinate and can move up and down along guidepost (7).
7. the pipe die transition line for automatic production line for pipe pile according to claim 1, it is characterized in that, described conveyer (1) comprise load-transfer device (10) and load-transfer device (10) upper equally spaced be fixed with some with load-transfer device (10) synchronizing moving and outstanding load-transfer device (10) surface thus can with the transport trolley (11) of the object contact on load-transfer device (10).
8. the pipe die transition line for automatic production line for pipe pile according to claim 7, it is characterized in that, described load-transfer device (10) both sides are respectively equipped with the guide rail (12) that extends to load-transfer device (10) two ends, the both sides of described transport trolley (11) be connected to a roller (13) and roller (13) to be pressed on guide rail (12) upper and roll with guide rail (12) and be connected.
9. the pipe die transition line for automatic production line for pipe pile according to claim 6, it is characterized in that, described lifting assembly (4) top is fixedly connected with jacking seat (14) and jacking seat (14) is fixedly connected with conveyer (1), described orienting sleeve (9) is fixed on jacking seat (14), described jacking seat (14) is also fixed with bearing seat (15), and synchronizing shaft (6) to be inserted in bearing seat (15) and to be rotationally connected with bearing seat (15).
10. the pipe die transition line for automatic production line for pipe pile according to claim 7 or 8, it is characterized in that, described conveyer (1) also comprises conveying support (16) and is fixed on the upper and transmission shaft (18) be rotationally connected with conveying support (16) of conveying support (16), described transmission shaft (18) is connected with load-transfer device (10), energy driving conveying belt (10) axial rotation when transmission shaft (18) rotates, described lifting mechanism (3) is fixedly connected with conveying support (16), some conveyers (1) share a driver train (17) and the mouth of driver train (17) connects the transmission shaft (18) on conveyer (1) with driving band.
CN201610112694.7A 2016-02-29 2016-02-29 Pipe die transition wire for automatic production line for pipe pile Active CN105564971B (en)

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Application Number Priority Date Filing Date Title
CN201610112694.7A CN105564971B (en) 2016-02-29 2016-02-29 Pipe die transition wire for automatic production line for pipe pile

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Application Number Priority Date Filing Date Title
CN201610112694.7A CN105564971B (en) 2016-02-29 2016-02-29 Pipe die transition wire for automatic production line for pipe pile

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CN105564971B CN105564971B (en) 2018-09-14

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09142348A (en) * 1995-11-24 1997-06-03 Daifuku Co Ltd Transportation split pallet and transfer device for vehicle onto the pallet
CN101428660A (en) * 2008-12-15 2009-05-13 安徽瑞祥工业有限公司 White car body assembly product line ski reciprocation conveying system branch station lifting mechanism
CN101475086A (en) * 2009-01-09 2009-07-08 广东三和管桩有限公司 Pipe die conveyor for tubular pile production process
CN201614144U (en) * 2010-01-08 2010-10-27 广东三和管桩有限公司 Tubular pile producing and conveying chain
CN202245063U (en) * 2011-09-20 2012-05-30 国鼎(南通)管桩有限公司 Chain type mould transfer vehicle for concrete pipe piles
CN205397433U (en) * 2016-02-29 2016-07-27 周兆弟 A branch -cut bridge is crossed to pipe die for tubular pile automation line

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09142348A (en) * 1995-11-24 1997-06-03 Daifuku Co Ltd Transportation split pallet and transfer device for vehicle onto the pallet
CN101428660A (en) * 2008-12-15 2009-05-13 安徽瑞祥工业有限公司 White car body assembly product line ski reciprocation conveying system branch station lifting mechanism
CN101475086A (en) * 2009-01-09 2009-07-08 广东三和管桩有限公司 Pipe die conveyor for tubular pile production process
CN201614144U (en) * 2010-01-08 2010-10-27 广东三和管桩有限公司 Tubular pile producing and conveying chain
CN202245063U (en) * 2011-09-20 2012-05-30 国鼎(南通)管桩有限公司 Chain type mould transfer vehicle for concrete pipe piles
CN205397433U (en) * 2016-02-29 2016-07-27 周兆弟 A branch -cut bridge is crossed to pipe die for tubular pile automation line

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Effective date of registration: 20201224

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