CN107309308B - A kind of small-sized rotary furrower structure - Google Patents

A kind of small-sized rotary furrower structure Download PDF

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Publication number
CN107309308B
CN107309308B CN201710574210.5A CN201710574210A CN107309308B CN 107309308 B CN107309308 B CN 107309308B CN 201710574210 A CN201710574210 A CN 201710574210A CN 107309308 B CN107309308 B CN 107309308B
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China
Prior art keywords
ditch
rotation
work
rotation ditch
base
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CN201710574210.5A
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CN107309308A (en
Inventor
斯文尼尔·帕特里克·路易斯·雅克
饶梅贵
赵俊强
张良
陈修素
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Zhejiang Liang Liang Intelligent Equipment Co Ltd
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Zhejiang Liang Liang Intelligent Equipment Co Ltd
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D17/00Forming single grooves in sheet metal or tubular or hollow articles
    • B21D17/04Forming single grooves in sheet metal or tubular or hollow articles by rolling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/003Positioning devices

Abstract

The present invention provides a kind of small-sized rotary furrower structure, including rotation ditch main body, rotation ditch location structure, rotation ditch mould clamping structure, base feeding structure and pedestal.Wherein, rotation ditch location structure is mounted on the base, and rotation ditch main body is mounted on base feeding structure, and pedestal is equipped with base feeding guide rail, and base feeding structure slides on pedestal along base feeding guide rail.Small-sized rotary furrower structure provided by the invention, motor drive rotation ditch main body to rotate by gear, the high stability of system.By revolving ditch location structure, metal tube is automatically positioned, the automation of equipment and integrated higher also improves the precision of product.

Description

A kind of small-sized rotary furrower structure
Technical field
It is high that the present invention relates to a kind of pipe fitting process equipment more particularly to a kind of machining accuracies, good small-sized of stabilization of equipment performance Rotary furrower structure.
Background technique
With the continuous improvement of people's living standards, people are also increasing to the demand of the products such as automobile, air-conditioning, vapour Many metal tubes need to carry out rotation channel forming to its pipe end in vehicle, air-conditioning, to pass through the O-shaped sealing of addition in the groove of formation Circle realizes sealing.Currently, the rotation channel forming of pipe end can be completed by rotary furrower, rotary furrower is for pipe fitting surface of material Carry out the mechanical equipment of rotation ditch processing.
Rotary furrower mainly includes that rotation ditch main axle structure, hold assembly and rotation ditch feeding structure, hold assembly clamp and consolidate Fixed metal tube to be processed, rotation ditch feeding structure push rotation ditch main axle structure mobile to hold assembly, are moved to designated position Afterwards, the stop motion of ditch feeding structure is revolved, rotation ditch main axle structure movement revolves ditch to metal tube to be processed, as needed can be with It is one or many to revolve ditch, can satisfy the rotation ditch of common metal pipe fitting.But as people gradually mention to what product quality required High and equipment integrated, existing rotary furrower has been unable to meet the requirements at the higher level of people, is mainly shown as and lacks in the presence of following Fall into: 1) outer dimension is big, takes up a large area, and does not adapt to the integrated intelligence equipment of modernization, is unable to satisfy industry requirement.2) Using position that is artificial, manually adjusting metal tube to be processed, debug time is long, and Product Precision is low, is not able to satisfy high-accuracy Spend the processing request of product.3) base is driven using oil cylinder, and rotation ditch work is promoted into structure using bilateral servo or oil cylinder, causes to set Standby assembly difficulty, noise is big when work, causes noise pollution, reduces the work comfort of staff.
Summary of the invention
The present invention is directed to technological deficiency of the existing technology, provides under a kind of equipment volume, integration degree is high, product The good small-sized rotary furrower structure of stability.
Small-sized rotary furrower structure provided by the invention, including rotation ditch main body, rotation ditch location structure, rotation ditch mould clamping structure, base Feeding structure and pedestal.
Wherein, rotation ditch location structure is mounted on the base, and rotation ditch main body is mounted on base feeding structure, on the pedestal Equipped with base feeding guide rail, the base feeding structure slides on the base along the base feeding guide rail;
The rotation ditch main body includes rotation ditch main shaft and roll wheel assembly, and one end of the rotation ditch main shaft and the roll wheel assembly connect It connects, the other end is equipped with rotation gear, and the gear of external threephase asynchronous machine output end is engaged with the rotation gear, driving rotation ditch Main shaft, and the roll wheel assembly is driven to rotate.
In a preferred embodiment, the small-sized rotary furrower structure is additionally provided with rotation ditch work into structure, the roll wheel assembly packet Multiple rotation ditch pawls and a hollow circuit cylinder ring are included, the rotation ditch pawl is equipped with bending part, one end circumference installation of multiple rotation ditch pawls On the side of described rotation ditch main shaft one end.
The lateral wall of the hollow circuit cylinder ring and the rotation ditch main shaft is socketed, one end inside of the hollow circuit cylinder ring and institute Rotation ditch pawl wedge-like engagement is stated, rotation ditch work is clamped into the lateral wall of structure and the hollow circuit cylinder ring, and drives the hollow circuit cylinder Ring controls the folding of the rotation ditch pawl along the lateral wall sliding of the rotation ditch main shaft.
In a preferred embodiment, the rotation ditch work is fixedly mounted on the base feeding structure into structure, described Revolve ditch work into structure include rotation ditch work into servo motor and rotation ditch work into section, the output end for revolving ditch work into servo motor be equipped with work into Screw pair, rotation ditch work drive rotation ditch work into Duan Yidong by work into servo motor into screw pair, and the free end for revolving ditch work into section is set There is work into the connection fixture block, rotation ditch work passes through the annular relief of work into the connection fixture block and the hollow circuit cylinder ring lateral wall into structure Clamping.
In a preferred embodiment, the lateral surface of rotation ditch work into the section is fixed with rotation ditch work into travel switch, rotation Ditch main body is equipped with work into feeding guide rail pair, and the rotation ditch work is slided along the work into feeding guide rail pair into travel switch, monitoring Ditch work is revolved into the position of section, and ditch work is revolved into Duan Qianjin and/or retrogressing with instruction.
In a preferred embodiment, the small-sized rotary furrower structure further includes rotation ditch mould clamping structure, the rotation ditch clamping knot Structure is adjacent with the roll wheel assembly, and the rotation ditch mould clamping structure is equipped with clamping part, and the clamping part includes a cylindrical channel.
In a preferred embodiment, the rotation ditch mould clamping structure is additionally provided with a clamping oil cylinder, and the clamping part is by two Symmetrical groove structure is constituted, clamping part described in the clamping oil cylinder locking.
In a preferred embodiment, base process travel switch monitoring base is additionally provided on the base feeding structure Position, to control the forward or backward of base feeding structure.
In a preferred embodiment, the rotation ditch location structure is equipped with position rotating axis and the plate that is located by connecting, described fixed Position connecting plate and the position rotating axis are in 70-120 °, and preferably 80-100 °, positioning cylinder drives the rotation of position rotating axis, excellent The middle part of selection of land, position rotating axis is equipped with position rotating bearing block, and the position rotating axis is revolved along the position rotating bearing block Turn, the position rotating bearing block is fixedly mounted on base feeding structure.
In a preferred embodiment, the free end of the plate that is located by connecting is equipped with positioning plate, the plate position that is located by connecting Between rotation ditch mould clamping structure and rotation ditch main body, the position rotating axis is parallel with the rotation symmetry axis of ditch main body.
Small-sized rotary furrower structure provided by the invention, motor drive rotation ditch main body to rotate by gear, the stability of system compared with It is high.By revolving ditch location structure, metal tube is automatically positioned, the automation of equipment and integrated higher also improves product Precision.Can also the number of rotation ditch be arranged according to actual needs in small-sized rotary furrower structure provided by the invention.Revolve ditch main shaft by Ditch main shaft three-phase motor is revolved by gear drive, and stable drive not only reduces the volume of rotary furrower structure, also increases rotary furrower The service life of structure.
Detailed description of the invention
Fig. 1 is the perspective view of small-sized rotary furrower structure provided by the invention;
Fig. 2 is another view stereo figure of the middle-size and small-size rotary furrower structure of Fig. 1;
Fig. 3 is the local structural graph of Fig. 1;
Fig. 4 is the structure chart that ditch main body is revolved in Fig. 1;
Fig. 5 is the perspective view that ditch location structure is revolved in Fig. 1;
Fig. 6 is the perspective view that ditch mould clamping structure is revolved in Fig. 1;
Fig. 7 is the cross-sectional view of Fig. 6.
Specific embodiment
As shown in Fig. 1-Fig. 7, small-sized rotary furrower structure provided by the invention includes rotation ditch main body, rotation ditch location structure, a rotation Ditch work is into structure 5, rotation ditch mould clamping structure 2, base feeding structure 7 and pedestal 1.
The upper surface of pedestal 1 is rectangle structure, and rotation ditch mould clamping structure 2 is fixedly mounted on the side short side of pedestal 1, bottom Seat 1 is equipped with frame guide rail (not shown), and base feeding structure 7 is along frame guide rail at the middle part of pedestal 1 along the long side side of pedestal 1 To movement.
It on pedestal 1, revolves and is equipped with oil storage tank between ditch mould clamping structure 2 and base feeding structure 7, the oil storage tank is cold for storing But the coolant liquid of metal tube and rotation ditch main body.
Base feeding structure 7 includes base and base feed servo motor 71, the output end of base feed servo motor 71 It is fixed with screw rod, screw rod is threadedly coupled with base, and base feed servo motor 71 drives base along frame guide rail by screw rod Sliding, the side of base is additionally provided with base feed distance switch 41, and when base runs to setting position, base feed distance is opened It closing 41 and the location information of base is transmitted to base feed servo motor 71, base feed servo motor 71 stops driving base, Base is fixed on setting position.When needing repeatedly to revolve ditch to pipe fitting, multiple rotation ditch positions can also be preset.Work as metal tube After the completion of part revolves ditch, base feed servo motor 71 is reversely rotated, and driving base moves in the opposite direction.
Rotation ditch main body includes roll wheel assembly, rotation ditch main shaft 32 and rotation ditch main shaft three-phase motor 34, revolves ditch main shaft three-phase motor 34 input terminal connects 380V AC power source, and output end is equipped with first gear, and idler wheel is fixedly mounted in the one end side of rotation ditch main shaft Component, the other end are equipped with second gear 38, i.e., rotation gear, first gear are engaged with second gear 38, revolve ditch main shaft three-phase electricity Machine 34 passes through first gear and the driving rotation ditch main shaft rotation of second gear 38.Further, first gear and second gear 38 Outside is additionally provided with rotation ditch seat 39, to protect first gear and second gear 38, prevents from accidentally injuring other people, improve provided by the invention small The safety of type rotary furrower structure.
Roll wheel assembly includes the 3 rotation ditch pawls 31 and a hollow circuit cylinder that circumference is arranged on rotation ditch main shaft free end side Ring 312.It revolves ditch pawl 31 and is equipped with bending part, be L-type, one end circumference is mounted on the side of rotation ditch main shaft free end, and the other end is Free end contacts when revolving ditch with metal tube, the rotation ditch pawl 31 of L-type by along the power of the symmetrical axial direction of rotation ditch main shaft be converted into perpendicular to The symmetrical axial power of ditch main shaft is revolved, the extended line of 3 rotation ditch pawl free ends intersects at a point, to implement to revolve ditch to metal tube.
The lateral wall of hollow circuit cylinder ring 312 and rotation ditch main shaft 32 is socketed, and can be slided along the outer surface of rotation ditch main shaft 32. The inner wall of hollow circuit cylinder ring 312 is gradually thinning, and the outer wall of rotation ditch pawl 31 gradually thickens, and revolves ditch pawl 31 and hollow circuit cylinder ring 312 Inner wall wedge-like engagement.During the bending part of hollow circuit cylinder ring 312 to rotation ditch pawl is mobile, by 3 rotation ditch pawls to rotation ditch main shaft 32 symmetrical axis direction squeezes, and the free end of 3 rotation ditch pawls is close to each other, to step up the metal tube of ditch to be revolved.
Further, the free end for revolving ditch pawl 31 is equipped with a support construction 311, and the support construction 311 is by rotation ditch work into watching Motor control is taken, when hollow circuit cylinder ring 312 moves right, rotation ditch work drives support construction 311 to far from rotation ditch into servo motor The direction of main shaft 32 is mobile, and support construction 311 drives rotation ditch pawl 31 to do centrifugal movement, the symmetry axis far from rotation ditch main shaft 32, In, left and right is consistent with the left and right directions in Fig. 1.
Revolving ditch work into structure 5 includes rotation ditch work into servo motor 51 and rotation ditch work into section, revolves ditch work into servo motor 51 Output end is equipped with work into screw pair 53, revolves ditch work and drives rotation ditch work to move into section or so into screw pair 53 by work into servo motor 51 Dynamic, rotation ditch work is equipped with work into the connection fixture block 55 into the free end of section, rotation ditch work into structure by work into the connection fixture block 55 with it is hollow The annular relief of 312 outer surface of cylinder ring is clamped, as shown in figure 3, rotation ditch work passes through work into screw pair 53 into servo motor 51 Driving rotation ditch work moves in left-right direction into section, and the work into the connection fixture block 55 of rotation ditch work into section is driven by annular relief hollow Cylinder ring 312 is moved left and right along the lateral wall of rotation ditch main shaft, and the folding of control rotation ditch pawl 31 in turn.
Rotation ditch work into being additionally provided with first stroke switch 42 in structure 5, first stroke switch 42 be fixedly mounted on revolve ditch work into The upper surface of section, and can be slided along the work for being mounted on rotation 34 side of ditch seat into feeding guide rail pair 54, to monitor rotation ditch work into section Position, and the rotating forward or anyway of rotation ditch work into servo motor 51 is adjusted according to the location information that detects, and then control rotation ditch pawl 31 folding.
Rotation ditch location structure 6 is equipped with position rotating axis 63 and the plate 61 that is located by connecting, and be located by connecting plate 61 and position rotating axis One end be fixedly connected in 90 °, positioning cylinder 66 drives position rotating axis 63 to rotate, and the plate 61 that is located by connecting is in position rotating axis 63 Drive under, along the Plane Rotation vertical with pedestal 1, the middle part of position rotating axis 63 and the other end are respectively equipped with a position rotating Bearing block 64, position rotating bearing block 64 is interior to be equipped with bearing 65, and position rotating axis 63 passes through position rotating bearing block 64 and along axis 65 rotations are held, position rotating bearing block 64 is fixedly mounted on the upper surface of base, is also vertically equipped with fixed mounting plate 67 on base, The upper end of fixed mounting plate 67 is equipped with mounting base, and positioning cylinder 66 may be rotatably mounted at the side of fixed mounting plate 67.
The plane that 61 rotary course of plate that is located by connecting is formed is located between rotation ditch mould clamping structure 2 and roll wheel assembly 31, positioning The lower part of 61 free end of connecting plate is equipped with positioning plate 62.
Rotation ditch mould clamping structure is located on pedestal, adjacent with roll wheel assembly, and rotation ditch mould clamping structure is equipped with clamping part, clamping part packet A cylindrical channel is included, clamping part is made of two symmetrical groove structures, clamping oil cylinder locking clamping part.
Rotation ditch mould clamping structure is additionally provided with a clamping oil cylinder, and the output end of clamping oil cylinder connects a drive shaft 28, drive shaft 28 Free end connect a T-block 27, the symmetry axis of T-block 27 is vertical with the symmetry axis of drive shaft 28, T-block 27 and drive shaft 28 Free end be threadedly coupled.
When revolving ditch to metal tube using small-sized rotary furrower structure provided by the invention, ditch location structure 6 is revolved in starting first, fixed Position cylinder 66 rotate forward, drive position rotating axis 63, be located by connecting plate 61 under the drive of position rotating axis 63, rotation to rotation ditch The cylindrical channel of mould clamping structure is horizontal, and clamping oil cylinder 22 drives 28 counter motion of drive shaft, two groove structures of clamping part Separation, to groove structure among be put into the metal tube of ditch to be revolved, and metal tube is pushed to the plate 61 that is located by connecting, until with positioning The positioning plate 62 of connecting plate 61 contacts.Positioning cylinder 66 inverts, driving position rotating axis 63 rotation to initial position.
Clamping oil cylinder 22 drives 28 forward motion of drive shaft, and two groove structures of clamping part move toward one another, clamping part folder The tightly metal tube of ditch to be revolved.Base feed servo motor 71 rotates forward, and the direction of driving base to rotation ditch mould clamping structure is mobile, machine Seat feed distance switch 41 records the position of base, and rotation ditch work drives roll wheel assembly into structure 5, and roll wheel assembly opens, to base When running to the first rotation ditch position, base feed servo motor 71 is kept, and base stops walking, and metal tube enters roll wheel assembly Inside, roll wheel assembly are closed, and metal tube is blocked, and rotation ditch work drives roll wheel assembly, roll wheel assembly closure into structure 5.
It revolves ditch main shaft three-phase motor 34 to act, driving rotation ditch main shaft 32 rotates, and carries out rotation ditch for the first time to metal tube.
For the first time in rotation ditch, rotation ditch main shaft three-phase motor 34 keeps spinning movement, revolves ditch work into servo counter-roller component It opens, base feed servo motor 71 is motionless, repeats the process for revolving ditch for the first time, repeatedly heavy up to completing last time rotation ditch Rotation ditch can guarantee to revolve the dimensionally stable of ditch again, can select one or many rotation ditches according to actual needs.Last time rotation ditch After the completion, roll wheel assembly open, rotation ditch main shaft three-phase motor 34 stop working, base feed servo motor 71 invert, base to Direction far from rotation ditch mould clamping structure is moved to initial position, and base feed distance switch 41 starts timing, is prepared to enter into next A workflow.
Can also the number of rotation ditch be arranged according to actual needs in small-sized rotary furrower structure provided by the invention.Revolve ditch main shaft by Ditch main shaft three-phase motor is revolved by gear drive, and stable drive not only reduces the volume of rotary furrower structure, also increases rotary furrower The service life of structure.Specific embodiments of the present invention are described in detail above, but it is merely an example, the present invention is simultaneously It is not limited to particular embodiments described above.To those skilled in the art, what any couple of present invention carried out, which be equal, repairs Change and substitutes also all among scope of the invention.Therefore, made impartial change without departing from the spirit and scope of the invention It changes and modifies, all should be contained within the scope of the invention.

Claims (8)

1. a kind of small-sized rotary furrower structure, which is characterized in that including rotation ditch main body, rotation ditch location structure, rotation ditch mould clamping structure, base Feeding structure and pedestal;
Wherein, rotation ditch location structure is mounted on the base, and equipped with position rotating axis and is located by connecting plate, it is described be located by connecting plate with The position rotating axis is in 70-120 °, and positioning cylinder drives the rotation of position rotating axis, and the free end of the plate that is located by connecting is equipped with Positioning plate, the plate that is located by connecting are located between rotation ditch mould clamping structure and rotation ditch main body;Drive of the positioning plate in position rotating axis Under, rotation to horizontal with the cylindrical channel of rotation ditch mould clamping structure, for the metal tube with promotion contact and to the metal tube Automatic positioning;
Rotation ditch main body is mounted on base feeding structure, and the pedestal is equipped with base feeding guide rail, the base feeding structure It is slided on the base along the base feeding guide rail;
The rotation ditch main body includes rotation ditch main shaft and roll wheel assembly, and one end of the rotation ditch main shaft is connect with the roll wheel assembly, The other end is equipped with rotation gear, and external motor revolves ditch main shaft by rotary teeth wheel drive, and the roll wheel assembly is driven to rotate.
2. small-sized rotary furrower structure according to claim 1, which is characterized in that the small-sized rotary furrower structure is additionally provided with rotation ditch work Into structure, the roll wheel assembly includes multiple rotation ditch pawls and a hollow circuit cylinder ring, and the rotation ditch pawl is equipped with bending part, multiple described One end circumference of rotation ditch pawl is mounted on the side of described rotation ditch main shaft one end;
The lateral wall of the hollow circuit cylinder ring and the rotation ditch main shaft is socketed, one end inside and the rotation of the hollow circuit cylinder ring Ditch pawl wedge-like engagement, rotation ditch work is clamped into the lateral wall of structure and the hollow circuit cylinder ring, and drives hollow circuit cylinder ring edge The lateral wall sliding of the rotation ditch main shaft controls the folding of the rotation ditch pawl.
3. small-sized rotary furrower structure according to claim 2, which is characterized in that the rotation ditch work is fixedly mounted on institute into structure It states on base feeding structure, the rotation ditch work includes rotation ditch work into servo motor and rotation ditch work into section into structure, revolves ditch work into watching The output end for taking motor is equipped with work into screw pair, revolves ditch work and drives rotation ditch work to move into section into screw pair by work into servo motor Dynamic, rotation ditch work is equipped with work into the connection fixture block into the free end of section, rotation ditch work into structure by work into the connection fixture block with it is described hollow The annular relief of cylinder ring lateral wall is clamped.
4. small-sized rotary furrower structure according to claim 3, which is characterized in that the lateral surface fixation of the rotation ditch work into section is set There is rotation ditch work into travel switch, revolves ditch main body and be equipped with work into feeding guide rail pair, the rotation ditch work is into travel switch along the work It is slided into feeding guide rail pair, monitoring rotation ditch work revolves ditch work into Duan Qianjin and/or retrogressing into the position of section, with instruction.
5. small-sized rotary furrower structure according to claim 1, which is characterized in that the small-sized rotary furrower structure further includes rotation ditch folder Mode structure, the rotation ditch mould clamping structure is adjacent with the roll wheel assembly, and the rotation ditch mould clamping structure is equipped with clamping part, the clamping Portion includes a cylindrical channel.
6. small-sized rotary furrower structure according to claim 5, which is characterized in that the rotation ditch mould clamping structure is additionally provided with a clamping Oil cylinder, the clamping part are made of two symmetrical groove structures, clamping part described in the clamping oil cylinder locking.
7. small-sized rotary furrower structure according to claim 1, which is characterized in that be additionally provided with base on the base feeding structure Process travel switch monitors the position of base, to control the forward or backward of base feeding structure.
8. small-sized rotary furrower structure according to claim 4, which is characterized in that the position rotating axis and the rotation ditch main body Symmetry axis it is parallel.
CN201710574210.5A 2017-07-14 2017-07-14 A kind of small-sized rotary furrower structure Active CN107309308B (en)

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109079013B (en) * 2018-07-31 2019-10-18 廖维东 The device of helicla flute is opened up in pipe fitting outside wall surface

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CN101020208A (en) * 2007-03-07 2007-08-22 张家港市合丰机械制造有限公司 Groove turning head
CN101020217A (en) * 2007-03-07 2007-08-22 张家港市合丰机械制造有限公司 Forming device of multiple-site pipe end forming machine
CN102357577A (en) * 2011-09-29 2012-02-22 中山市奥美森工业技术有限公司 Groove turning machine
CN105642774A (en) * 2014-07-06 2016-06-08 胡小青 Electric aluminum pipe expanding machine automatically performing feeding through gravity
CN105773167A (en) * 2016-03-30 2016-07-20 黄建财 Automatic pipe-end machining system

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JP2003103326A (en) * 2001-09-28 2003-04-08 Amada Co Ltd Positioning device for plate material of plate material working machine and positioning method for plate material using the device

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Publication number Priority date Publication date Assignee Title
CN101020208A (en) * 2007-03-07 2007-08-22 张家港市合丰机械制造有限公司 Groove turning head
CN101020217A (en) * 2007-03-07 2007-08-22 张家港市合丰机械制造有限公司 Forming device of multiple-site pipe end forming machine
CN102357577A (en) * 2011-09-29 2012-02-22 中山市奥美森工业技术有限公司 Groove turning machine
CN105642774A (en) * 2014-07-06 2016-06-08 胡小青 Electric aluminum pipe expanding machine automatically performing feeding through gravity
CN105773167A (en) * 2016-03-30 2016-07-20 黄建财 Automatic pipe-end machining system

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