EP2380674A2 - Tête de pliage extensible - Google Patents

Tête de pliage extensible Download PDF

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Publication number
EP2380674A2
EP2380674A2 EP11161132A EP11161132A EP2380674A2 EP 2380674 A2 EP2380674 A2 EP 2380674A2 EP 11161132 A EP11161132 A EP 11161132A EP 11161132 A EP11161132 A EP 11161132A EP 2380674 A2 EP2380674 A2 EP 2380674A2
Authority
EP
European Patent Office
Prior art keywords
bending
head
core
fingers
pivotable
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.)
Withdrawn
Application number
EP11161132A
Other languages
German (de)
English (en)
Other versions
EP2380674A3 (fr
Inventor
Christian Fauter
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.)
Felss Burger GmbH
Original Assignee
Felss Burger GmbH
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 Felss Burger GmbH filed Critical Felss Burger GmbH
Publication of EP2380674A2 publication Critical patent/EP2380674A2/fr
Publication of EP2380674A3 publication Critical patent/EP2380674A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
    • B21D7/022—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment over a stationary forming member only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/06—Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form
    • B21D11/07—Making serpentine-shaped articles by bending essentially in one plane

Definitions

  • Such a bending head is from the DE 101 10 217 A1 known.
  • bending heads also bending units
  • the bending material usually tubular or rod-shaped and of a coil-shaped stock ("coil") provided unwound and pre-directed, is applied to the bending head to a bending core (this is the actual tool) and forced to the contour of the bending core.
  • coil-shaped stock this is the actual tool
  • Most bending cores have a groove, which facilitates the positioning of the bending material.
  • the bending of the Biegeguts to the bending core is done by a combination of bending core processes (when Biegegut clamped) and the bending of the Biegeguts with so-called bending fingers.
  • the bending finger moves the Biegegut according to the contour of the bending core on the side facing away from the bending core.
  • meander-shaped structures In the manufacture of meander-shaped structures from bent material, e.g. For the production of solar modules or other heat exchangers, several meander loops are pulled successively. For the formation of a meander loop, two outer bending heads and a middle bending head engage the initially straight material to be bent. The outer bending heads are contracted and the center bending head is moved with a carriage away from the line of connection of the contracting outer bending heads. While the outer bending heads have only one bending finger, the middle bending head needs two bending fingers, which depart opposite sides of the bending core, corresponding to both arms of the meander loop.
  • the shape of the finished meander loop depends essentially on the middle bending head.
  • the middle bending head determines the distance between the two arms of the meander loop and the formation of the loop end, usually as a 180 ° bend or two 90 ° bends with a straight intermediate section.
  • a conventional middle bending head fits exactly only one shape of a meander loop, usually with a 180 ° bend due to coincident bending centers (axes of rotation) of the bending fingers. If, for example, a structure of meander loops with two 90 ° bends and a straight intermediate section with this bending head are to be manufactured, a new bending core with two separate bending core sections of semicircular profile and a filler piece is usually mounted therebetween. The bending fingers are radially offset so that their circular paths pass the 90 ° bends of the bending core sections.
  • the bending fingers can not run the same radius as the bending core actually pretends, because the bending centers (axes of rotation or centers) of the bending fingers and the bending core sections fall apart. This reduces the bending quality (for example, due to pipe penetration). If the spacing of the meander loops (i.e., the length of the intermediate piece) becomes too great, the bending head must be replaced with a bending head designed specifically for the desired shape, or two separate center bending heads (each with a bending finger) must be used. In both latter cases, high costs arise through additional components and large conversion costs.
  • the DE 198 53 294 A1 describes a device for stretch bending of metal rods.
  • the metal rod is applied to two counter bearings and gripped by two clamping means.
  • the clamping means are each arranged on a bending arm which can be pivoted about an axis by a motor.
  • the bending arms are each slidable on sliders to allow different center lengths between the bending points on the metal rod.
  • the US 2,414,926 describes a tube bending machine in which several bending cores can be moved together with forming rollers by means of carriages on a frame against each other.
  • the DE 1 280 553 A describes a multi-part bending tool for pipes with two mold blocks, a bearing piece arranged between them, two forming rollers and a clamping block. To demould a bent pipe, the mold blocks are pulled together towards the support piece.
  • the invention has for its object to enable the production of different shapes of meander loops, in particular with a 180 ° bend or two 90 ° bends, with little effort, especially low conversion costs, with high bending quality.
  • a bending head of the type mentioned which is characterized in that the bending head comprises a first holder and a second holder, wherein the holders are mounted on the carriage against each other, in that the bending core comprises a first bending core section and a second bending core section, wherein the first bending finger is arranged on the first holder and the first bending finger is pivotable about the first bending core portion, and wherein the second bending finger is arranged on the second holder and the second bending finger is pivotable about the second bending core portion, that the bending fingers are each pivotable in a circular arc around their respective bending core portion, and that the holders are slidable on the carriage in a contracted position , in which the centers of the circular arc-shaped tracks, on which the bending fingers are each pivotable, coincide.
  • a bending head with which an adaptation to different shapes to be made of loops of bending material can take place, in particular as a middle bending head in a bending machine with two further outer bending heads, on which meander-shaped structures are manufactured.
  • the bending head has two brackets, which can be moved against each other on the slide. On these brackets are (at least) the bending fingers mounted together with their traversing mechanism for descending the contour of the deformed Biegeguts directly or indirectly.
  • brackets By setting a suitable distance of the brackets, an adaptation to the size of a loop, in particular the distance between the arms of a meander loop, take place, so that the same bending fingers and the same traversing mechanisms of the bending fingers can be used for different shapes of meander loops.
  • essentially the same bending head can be used for different shapes of loops to be manufactured, wherein in particular the bending centers of the bending core sections and the bending fingers can be brought into coincidence, so that a high bending quality can be achieved.
  • the bending fingers are each pivotable about a circular arc-shaped path about their respective bending core portion.
  • the circular path corresponds to the most important, required in practice form of the deformed Biegeguts;
  • the bending core sections are then typically also circular arc-shaped (usually each with a semicircular profile) is formed.
  • the holders are displaceable on the carriage in a contracted position, in which the centers of the circular arc-shaped tracks, on which the bending fingers are each pivotable, coincide. As a result, 180 ° bends can be made at the loop ends of the Biegeguts.
  • the bending head in which the first bending core section and the second bending core section are fastened to the carriage independently of the holders.
  • the bending core sections are not displaceable together with the brackets in this embodiment.
  • the bending core sections may be attached directly or indirectly to the carriage.
  • the bending core is partially or completely rebuilt or exchanged upon a change of the shape to be fabricated of a loop. Rebuilding or replacing only the bending core is much easier and less expensive than replacing the entire bending head or adding another center bending head. Characterized in that in this embodiment, the bending core sections do not ride on the brackets, in and Ausfädelmechaniken on the bending core (such as a sharing and moving apart of the bending core "in the groove”) can be made easier.
  • the bending core sections are formed integrally together and are releasably secured to the carriage, in particular screwed or clamped.
  • One-piece here means that the two opposite bending core sections are formed on a single component or a single, completely assembled and completely removable assembly (without prejudice to any division of the bending core "in the groove").
  • Any intermediate sections and counter sections with which a Buckling or bulging of Biegegut between spaced bending core portions is prevented, are preferably integrated into the single component or the only assembly.
  • first bending core section and the second bending core section are formed separately, in particular wherein on the carriage receptacles, such as elongated holes, are formed, in which the first and the second bending core portion can be fastened at different intervals.
  • the same bending core portions can be used at different loop sizes (intervals of the meander arms), thereby saving tooling costs.
  • first bending core portion is arranged on the first holder, and the second bending core portion is arranged on the second holder.
  • first and second bending core portions are formed separately.
  • the bending core sections need to be converted (offset) or replaced when adapted to a new loop size (a new distance of the meander arms) with the same bending radius. This will further facilitate the customization.
  • the bending core also loading and Einfädelmechaniken the bending core (such as a division of the bending core sections "in the groove") and their drives partially or completely transferred to the brackets.
  • the bending fingers are each pivotable on a circular arc-shaped path about their respective bending core portion in an angular range of at least 100 °.
  • an overbending angle of at least 10 ° can be ensured, so that even with long meandering the elastic return springs of the arms can be compensated during deformation, especially when parallel meander arms are required.
  • the sheet guides are particularly space-saving, in particular, the establishment of a contracted position of the brackets is easily possible.
  • the sheet guide may comprise a rail (or more rails) and be designed in particular as a roller guide or as a sliding guide. Alternatively, lever guides are conceivable.
  • a preferred embodiment provides that in each case a drive, in particular a servomotor, is mounted on the holders, with which the respective bending finger is pivotable directly or indirectly on the respective holder.
  • a drive in particular a servomotor
  • the drive is not affected by an adjustment of the distance of the brackets.
  • the bending fingers are each arranged on a base piece, which is mounted pivotably on the associated holder, in particular, wherein the base piece has an external toothed ring, in which a toothed wheel of the respective drive engages.
  • This arrangement has proven itself in practice.
  • the radius with which the bending fingers are moved can also be adapted; this can be recordings and / or Fixing holes may be provided on the base piece.
  • sprocket and gear other power transmission means can be used, such as a toothed belt.
  • the bending head comprises an intermediate piece, which is insertable in a spread position of the brackets between the bending core and forms together with the bending core sections a preferably flush and preferably straight running system for the Biegegut, in particular wherein the Bending head further comprises a counterpart, which lies opposite the intermediate piece, so that between the intermediate piece and the counterpart the Biegegut can be clamped.
  • the installation of the Biegeguts can be done better defined.
  • the counter piece can be made a backup against buckling / bulging.
  • the bending core sections and optionally the intermediate piece in a plane in which the Biegegut is guided are formed divided and can be opened for unthreading of the Biegeguts perpendicular to this plane, in particular pneumatically or hydraulically.
  • this division “in the groove” can be done in a simple and fast way, the Biegegut so to speak "through the bending head” to change from the production of a loop to the next.
  • Pneumatic drives have proven to be particularly cost effective here.
  • the bending fingers are designed as bending rollers or sliders. Bending rolls (usually made of steel) have proven to be particularly suitable for deforming bent products made of steel. Sliders, which are made of plastic, are mainly used in the deformation of bending material made of copper or aluminum, in particular copper pipes or aluminum pipes.
  • the distance of the holders on the carriage is continuously adjustable, in particular by means of a hand wheel or by means of a servo or servo motor. Due to the stepless adjustment, an adaptation to any size of loops can be made.
  • a handwheel mechanism is particularly cost-effective; with motorized drives an automation of the adaptation is facilitated.
  • the bending material is optionally provided with a 180 ° bend in a contracted position or provided with two 90 ° bends in a spread position. Such a change in the shape of the loop end can be done with very little effort with the bending head according to the invention.
  • FIGS. 1a to 1c show schematically an embodiment of a bending head 1 according to the invention for deforming Biegegut 2.
  • a carriage 3 On a carriage 3 are two holders 4a, 4b against each other in a (here horizontal) direction VR (parallel to the x-direction, the directions x, y and z form an orthogonal system) slidably mounted with linear guides 5.
  • the distance between the plate-shaped holders 4a, 4b is adjustable with a handwheel 6 (and a transmission, not shown, such as a left / right spindle); in the contracted position shown here, the distance is zero.
  • the carriage 3 with all structures, in particular both brackets 4a, 4b, with a non-illustrated drive (such as an NC drive) in a (here) vertical plane (approximately in the directions x and z) movable.
  • the bending head 1 is substantially symmetrical with respect to its left (first) and right (second) sides.
  • base pieces 7a, 7b are mounted pivotably on arcuate sheet guides 8a, 8b.
  • the essentially plate-shaped base pieces 7a, 7b can in each case via its own drive 9a, 9b, here an NC motor, are driven, each of which is mounted on the associated holder 4a, 4b and movable with this.
  • the transmission of power from the NC motors to the base pieces 7a, 7b takes place in each case via a toothed wheel 10a, 10b and a ring gear 11a, 11b on the base piece 7a, 7b ("gear and pinion").
  • the left side base piece 7a with its ring gear 11a is set slightly forward with respect to the ring gear 11b of the right side base piece 7b, so that the base pieces 7a, 7b can be slightly pivoted one over the other; the formation of the sprockets 11, 11 b for over-bending is then simplified and it is a symmetrical structure of the bending head 1 allows.
  • a bending finger 12a, 12b is fixed, wherein the bending fingers 12a, 12b are formed here as sliders.
  • the bending fingers are in a starting position on Biegegut 2.
  • the Biegegut 2 continues to rest on a bending core 13.
  • This bending core 13 has two mutually opposite bending core sections 14a, 14b, which merge (here) on the same component (with respect to the bending core sections "one-piece” design of the bending core) and can be mentally distinguished by a vertical bisector HA of the bending core 13.
  • the bending core 13 has a groove 15 for the guidance of the Biegeguts 2 and is divided along this groove (see Fig. 3a, 3b ).
  • the bending core 13 is circular in cross-section here (see. Fig. 1 c) , so that a 180 ° bend of the Biegeguts 2 is prepared; the bending core portions 14a, 14b together form a circle with center point M.
  • the supports 4a, 4b are in a contracted position such that the centers Ma, Mb of the arcuate sheet guides 8a, 8b coincide and also with the center M ("bending center") of the Biegekerns 13 match.
  • the bending fingers 12a, 12b also pivot on a circular path in each case;
  • the gears 10a, 10b by means of the drives (NC motors) 9a, 9b in the in Fig. 1c turned direction.
  • Fig. 1c shows the bending head
  • Fig. 2 the bending head 1 after a pivoting of the base pieces 7a, 7b and the bending fingers 12a, 12b.
  • the pivoting of the base pieces 7a, 7b relative bending down of the Biegeguts 2 at the outer ends by other (external) bending heads is accompanied (not shown), wherein the bending head 1 is moved away from a connecting line of the two other (outer) bending heads. Due to the contracted brackets 4a, 4b and the coincidence of the centers Ma, Mb, a 180 ° bend (without a straight intermediate section) sets in the Biegegut 2.
  • the bending material 2 is also more than 90 ° at each bending finger 12a, 12b (90 ° is in Fig. 2 shown) can be bent ("overbending"), in particular in order to obtain a total of 180 ° bending after an elastic spring back of the Biegeguts 2.
  • the sprockets 11 a, 11 b would still allow an overbending of about 10 °.
  • FIGS. 3a and 3b illustrate the divisibility of the bending core 13 "in the groove" (here in the y direction with respect to an xz plane) in a side view ("tool splitting").
  • the bending core 13 has a rear half 18a and a front half 16b (these halves are here integral with respect to the two opposing bending core portions, therefore, the bending core 13 as a whole is also referred to as one piece with respect to the bending core portions, which is preferable for 180 ° bending When manufacturing two 90 ° bends, a three-part design of each half is preferred).
  • the both halves 16a, 16b are in the closed position (FIG. Fig. 3a ) lying together and together form the groove 15 for the Biegegut 2.
  • FIGS. 4a and 4b show the same bending core 1 as in Fig. 1 a and Fig. 1c but converted to a shape of a grinding end of the bending material 2 to be deformed with two 90 ° bends with a straight intermediate section. Only the differences become Fig. 1a and Fig. 1c explained.
  • the bending core 13 here has two separate and spaced apart bending core sections 14a, 14b, each having a semicircular profile. Between the bending core portions 14a, 14b, an intermediate piece is inserted (in the FIGS. 4a and 4b covered, cf. to Fig. 6b ). The spacing of the bending core sections 14a, 14b with respect to the centers M 'and M "(" bending centers ") of the semicircular profiles is AB The bending core sections 14a, 14b and the intermediate piece are here directly on the carriage 3 (and not on the supports 4a, 4b ) attached.
  • the brackets 4a, 4b are set in a spread position with also the distance AB; the adjustment was made by means of the hand wheel 6.
  • the centers Ma, Mb of the circular paths of the sheet guides 8a, 8b then also have the distance AB and coincide with the centers M ', M "of semicircular profiles of the bending core sections 14a, 14b together.
  • the bending finders 12a, 12b mounted on the holders 4a, 4b can then be moved by means of the base pieces 7a, 7b on circular paths around their respective bending core portion 14a, 14b (or its center at M ', M ").
  • Fig. 6a and Fig. 6a show again schematically the conditions at the bending core 13 in the situations of Fig. 1a-1c and Fig. 4a-4b in a front view, without occlusions.
  • a bending core 13 is provided with a fully circular profile, around which the bending finders 12a, 12b are guided on both sides on a circular path with coinciding centers Ma, Mb.
  • the bending core 13 can be understood as comprising two bending core sections 14a, 14b with a semicircular profile, wherein the bending core sections 14a, 14b adjoin or overlap one another.
  • Bend core 13 comprises two bending core portions 14a, 14b with semicircular profile, which are spaced from each other, see. Distance AB. Between the bending core portions 14a, 14b, a straight intermediate piece 19 ("filler") is inserted, which is flush with the bending core portions 14a, 14b. The intermediate piece 19 opposite is a straight counterpart 20, wherein between the intermediate piece 19 and the counterpart 20 just enough space for the Biegegut 2 remains.
  • the brackets (not shown here), on which the bending fingers 12a, 12b can be pivoted, were placed in a spread position, so that the centers Ma, Mb of the tracks of the bending fingers 12a, 12b by the distance AB corresponding to the distance AB of the bending core sections 14a, 14b fall apart.
  • Fig. 7a shows a schematic side view of a bending machine 70, in which a bending head 1 according to the invention as a central bending head when pulling meander loops (here with 180 ° bends) is used.
  • a first outer bending head 71 and a second outer bending head 72 and the middle bending head 1 are applied to the still undeformed, straight Biegegut 2 and take it (of the bending heads are simplifying only the bending cores indicated).
  • the outer bending heads 71, 72 are relatively moved towards each other (in the example shown, only the first outer bending head 71 moves to the right), and the middle bending head 1 is pulled up here from the line connecting the outer bending heads 71, 72, but remains in the middle between the outer bending heads 71, 72.
  • the Biegegut 2 is pulled in a loop up, see. to Fig. 7 b. In the same way several loops can be pulled one behind the other so that a meandering structure is created.
EP11161132.3A 2010-04-26 2011-04-05 Tête de pliage extensible Withdrawn EP2380674A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010018397A DE102010018397B4 (de) 2010-04-26 2010-04-26 Spreizbarer Biegekopf

Publications (2)

Publication Number Publication Date
EP2380674A2 true EP2380674A2 (fr) 2011-10-26
EP2380674A3 EP2380674A3 (fr) 2015-10-21

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EP11161132.3A Withdrawn EP2380674A3 (fr) 2010-04-26 2011-04-05 Tête de pliage extensible

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EP (1) EP2380674A3 (fr)
DE (1) DE102010018397B4 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016030461A1 (fr) * 2014-08-28 2016-03-03 Keeling Mark Machine à cintrer
WO2019101272A1 (fr) * 2017-11-22 2019-05-31 Grob-Werke Gmbh & Co. Kg Unité, moyen, dispositif et procédé de pliage et de production d'enroulements ondulés pour enroulements de bobine de machines électriques
CN109834780A (zh) * 2019-04-01 2019-06-04 钛马迪家居江苏有限公司 一种可实现无级调节的家具零件弯曲成型机
CN113369411A (zh) * 2021-06-17 2021-09-10 渭南高新区木王科技有限公司 一种探针用旋转式多弯折机
CN114558978A (zh) * 2020-11-27 2022-05-31 台山市东扩钢构有限公司 一种脚踏式扣形链链节折弯装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2414926A (en) 1943-06-28 1947-01-28 Boiler Engineering & Supply Co Tube bending machine with pivoted sweep arm
DE1280553B (de) 1961-06-13 1968-10-17 Heinrich Zenhaeusern Vorrichtung zur Herstellung von U-foermig gebogenen Rohren
DE19853294A1 (de) 1998-11-19 2000-05-31 Schade Gmbh & Co Kg Vorrichtung zum Streckbiegen von Metallstäben oder -profilen
DE10110217A1 (de) 2001-03-04 2002-09-05 Paul-Gerhard Heuser Einrichtung zum fortlaufenden Biegen einer Rohrleitung od.dgl.

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1298666A (en) * 1969-01-13 1972-12-06 Michael William Lusty Pipe bender
DE2900672A1 (de) * 1979-01-10 1980-07-17 M & W Fertigungsstrassen Gmbh Biegevorrichtung und verfahren zum biegen eines langgestreckten materialstranges
GB2213410B (en) * 1987-12-14 1991-09-04 Usui Kokusai Sangyo Kk Pipe bending apparatus
IT1259520B (it) * 1992-04-06 1996-03-20 Struttura per il sopporto e posizionamento universali di utensili impiegati da una macchina piegatrice di elementi allungati

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2414926A (en) 1943-06-28 1947-01-28 Boiler Engineering & Supply Co Tube bending machine with pivoted sweep arm
DE1280553B (de) 1961-06-13 1968-10-17 Heinrich Zenhaeusern Vorrichtung zur Herstellung von U-foermig gebogenen Rohren
DE19853294A1 (de) 1998-11-19 2000-05-31 Schade Gmbh & Co Kg Vorrichtung zum Streckbiegen von Metallstäben oder -profilen
DE10110217A1 (de) 2001-03-04 2002-09-05 Paul-Gerhard Heuser Einrichtung zum fortlaufenden Biegen einer Rohrleitung od.dgl.

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016030461A1 (fr) * 2014-08-28 2016-03-03 Keeling Mark Machine à cintrer
US10328476B2 (en) 2014-08-28 2019-06-25 Mark KEELING Bending machine
WO2019101272A1 (fr) * 2017-11-22 2019-05-31 Grob-Werke Gmbh & Co. Kg Unité, moyen, dispositif et procédé de pliage et de production d'enroulements ondulés pour enroulements de bobine de machines électriques
CN111684691A (zh) * 2017-11-22 2020-09-18 格鲁博-工厂有限及两合公司 用于弯曲和制造用于电机的线圈绕组的波形绕组的单元、装置、设备和方法
US11705791B2 (en) 2017-11-22 2023-07-18 Grob-Werke Gmbh & Co. Kg Unit, device, apparatus and method for bending and producing wave windings for coil windings of electric machines
CN109834780A (zh) * 2019-04-01 2019-06-04 钛马迪家居江苏有限公司 一种可实现无级调节的家具零件弯曲成型机
CN114558978A (zh) * 2020-11-27 2022-05-31 台山市东扩钢构有限公司 一种脚踏式扣形链链节折弯装置
CN113369411A (zh) * 2021-06-17 2021-09-10 渭南高新区木王科技有限公司 一种探针用旋转式多弯折机

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Publication number Publication date
DE102010018397B4 (de) 2013-12-12
DE102010018397A1 (de) 2011-10-27
EP2380674A3 (fr) 2015-10-21

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