EP0104844A2 - Vorrichtung zur Herstellung flexibler, gewellter Rohre - Google Patents

Vorrichtung zur Herstellung flexibler, gewellter Rohre Download PDF

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Publication number
EP0104844A2
EP0104844A2 EP83305425A EP83305425A EP0104844A2 EP 0104844 A2 EP0104844 A2 EP 0104844A2 EP 83305425 A EP83305425 A EP 83305425A EP 83305425 A EP83305425 A EP 83305425A EP 0104844 A2 EP0104844 A2 EP 0104844A2
Authority
EP
European Patent Office
Prior art keywords
strip
rollers
spider
nip
cassette
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.)
Granted
Application number
EP83305425A
Other languages
English (en)
French (fr)
Other versions
EP0104844A3 (en
EP0104844B1 (de
Inventor
Gunter Schafer
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.)
Security Lumber and Supply Co
Original Assignee
Security Lumber and Supply Co
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 Security Lumber and Supply Co filed Critical Security Lumber and Supply Co
Publication of EP0104844A2 publication Critical patent/EP0104844A2/de
Publication of EP0104844A3 publication Critical patent/EP0104844A3/en
Application granted granted Critical
Publication of EP0104844B1 publication Critical patent/EP0104844B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/126—Supply, or operations combined with supply, of strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/121—Making tubes or metal hoses with helically arranged seams with non-welded and non-soldered seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/124—Making tubes or metal hoses with helically arranged seams the tubes having a special shape, e.g. with corrugated wall, flexible tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/128—Control or regulating devices

Definitions

  • the present invention relates to an improved apparatus for forming a longitudinally corrugated thin strip into a flexible corrugated tube generally like that disclosed in U.S. Patent 4,141,385, issued February 27, 1979 to Emil Siegwart.
  • Apparatus of the type disclosed in U.S. Patent 4,058,997 may be used to produce tubes of different diameters only by removing from the apparatus a plate which carries a circle of forming rollers which are tangent to a circle of one diameter, and replacing that plate with another one which carries rollers that are tangent to a circle of a different diameter.
  • switching the machine from the manufacture of a tube of one diameter to that of another diameter is quite a complex and time consuming job.
  • a large percentage of the flexible corrugated tubes made in this type of machine are used for air conditioning ducts, and any particular air conditioning installation usually requires ducts in several different sizes.
  • a portable duct curling machine is used to produce duct as needed at a job site, and there are portable units for this purpose.
  • the portable units like the unit of the Siegwart patent, may be used to produce tubes of different sizes only by replacing an entire front plate which carries the curling rollers that are tangent to a circle of a particular diameter. This means that several interchangeable curling die plates must be carried with the portable machine.
  • portable apparatus of a type heretofore developed by the present inventor in Germany utilizes a cassette to receive a reel of precorrugated strip which is used in the fabrication of the flexible corrugated tube.
  • a portable apparatus for manufacturing flexible corrugated tube includes a cassette to receive a reel of longitudinally corrugated strip, and an outfeed opening of the cassette is provided with a pair of guide rollers which have intermeshing arcuate lands and grooves forming a nip that matches the corrugations of the strip, and when the cassette is hung on the frame of the curling apparatus, the nip of the guide rollers is immediately adjacent and coplanar with the nip of driven infeed rollers which also exactly match the corrugations of the strip. Accordingly, the feed of the strip into the curling apparatus is carefully controlled, and any deviations in the corrugations or possible deformations in the edges of the strip are eliminated before the strip enters the curling rollers.
  • rollers which are arranged in a circle to determine the diameter of the tube being produced by the apparatus are carried upon a spider which is vertically adjustable relative to strip outfeed rollers that drive the strip into the circular array of curling rollers.
  • the spider is movable vertically relative to the outfeed rollers so as to change the distance from the nip of the outfeed rollers to the longitudinal axis about which the curling die rollers form a circle, and at the same time all of the curling die rollers are radially adjustable with reference to that axis so as to permit the apparatus to be very simply adjusted to produce tubes of different diameters.
  • a single manual adjusting crank serves to move the spider vertically relative to the nip of the outfeed rollers, and at the same time moves all of the curling die rollers radially to accomplish the desired adjustment of diameter in a single operation.
  • the apparatus of the present invention may be readily adjusted to produce corrugated tube from about .50.8 mm (2 inches) to about 508mm (20 inches) in diameter.
  • the coil locking apparatus of the present invention has jaws which indent the two sides of a corrugation, rather than squashing the top of the corrugation as taught in patent 4,141,385.
  • the resulting lock is less obtrusive and thus produces a better looking tube than the prior art.
  • a tube forming apparatus illustrated generally at 18, includes a curling unit, indicated generally at 20 and a cassette 21 from which the unit 20 receives precorrugated aluminum strip S to form into flexible tube T.
  • the tube forming apparatus 20 has a base 22 that includes a frame 23, and cooperating input rollers 24 and 25 are mounted on the frame to feed the precorrugated strips S recieved from the cassette 21.
  • the curling die unit 20 also includes an upright support 26 which has a base plate 26A that is rotatable on the base 22 on a vertical axis as will be described in more detail; and output rollers 27 and 28 are carried upon the support 26 to receive the strip S from the input rollers 24 and 25 and feed it into a bending device 119 (detailed in Fig. 13), and a series of curling die rollers 29-35 which are journaled on respective spindles 29A-35A that are mounted in a circular configuration on a curling die base 36 that is vertically adjustable on the upright support 26.
  • the spindles 29A-35A are readily removed.
  • the curling die base 36 includes a roller supporting spider 37, a frame 38 and guide posts 38A that are guided in sleeves 39 which are mounted on a cross bar 40 on the rear of a gear housing 41 that is fixed on the upright support 26.
  • the radial distance of each of the rollers 29-35 form a center 37A of the roller supporting spider 37, which coincides with the longitudinal axis of a forming tube T, may be adjusted so as to allow the manufacture of flexible tubes having different diamters.
  • the spider 36 and the rollers 29-35 are moved vertically on the support 26 toward or away from the output rollers 27 and 28 so that the center 37A of the spider 37 always coincides with the longitudinal axis of the flexible tube being formed.
  • the support 26 is rotated on the base 22 about its vertical axis, so the angle of the helix formed by spiral winding the corrugated strip S matches the diameter of the forming tube T.
  • a small tube requires a large helix angle, while a large tube requires a small helix angle.
  • the vertical adjustment of the curling die base 36 and the radial adjustment of the rollers 29-35 are both accomplished by using a hand crank 42 to turn a spindle 43 which carries an adjusting bevel drive gear 44 that drives a cluster of bevel pinions 45-52 (see Fig. 7).
  • the bevel pinion 45 is attached to the upper end of an upright adjusting screw 53 which extends within a screw housing 54 of the curling die base 36 and is vertically movable through a threaded nut 55 which is disposed within the housing 54 and is part of a block that extends outwardly through an elongate opening of the housing 54 and is mounted upon the gear housing 41.
  • Rotation of the spindle 43 causes a corresponding rotation of the upright screw 53 .within the nut 55, and this causes the entire curling die base 36 to move vertically with respect to the output rollers 27-28 which are carried on the gear housing 41.
  • a cam plate 56 Secured to the frame 38 is a cam plate 56 that includes a cam slot 57 which traverses a cam follower 58 that is fixedly secured to the base 22.
  • Vertical movement of the curling die base 36 causes the cam slot 57 to traverse the cam follower 58, and this causes the upright support 26 to rotate about its axis, which is the axis of a vertical shaft 59 that is bearing supported within the base 22.
  • a base plate locking bolt 26B extends through an arcuate slot 26C in the base plate 26A of the upright support 26, and the locking bolt 26B is loosened when the tube diameter is to be changed.
  • the pivotal movement of the parts changes the angle of the helix to match the diameter of the tube being formed, and the amount of the pivotal movement is controlled by the shape of the cam slot 57.
  • the pinions 46-52 are part of spindle adjusting means 60 for adjusting the radial positions of the curling die roller spindles 29A-35A.
  • the pinions 46-52 are mounted on respective radial adjusting screws 61-67 that are carried within radial screw housings 68-74 of the spider 37.
  • the radial adjusting screws 61-67 engage respective spindle nuts 75-81 which are parts of slide blocks on which the spindles 29A-35A are respectively mounted. Therefore, all the curling die rollers 29-35 move radially in unison toward or away from the center 37A of the roller spindle 37 in response to rotation of the spindle 43.
  • a motor 82 is mounted upon the base 22 and is connected through a timing belt drive 83 to the upright shaft 59.
  • the shaft 59 is coupled via bevel gears 84-85 and a timing belt drive 86 to a lower output shaft 27A which mounts the lower output roller 27.
  • the lower output shaft 27A is also coupled through gears 87-88 to an upper output shaft 28A which mounts the upper output roller 28.
  • the input rollers 24-25 are driven by means of a second timing belt drive 89 from the upright shaft 59 to a shaft 90.
  • a bevel gear 91 on the shaft 90 meshes with a bevel gear 92 on a jack shaft 93 to drive a further timing belt drive 94 for a lower input roller 24A which mounts the lower input roller 24.
  • the lower input roller shaft 24A is connected by gears 95 and 96 to an upper input roller shaft 25A which mounts the upper input roller 25.
  • the input rollers 24-25 are driven by means of a second timing belt drive 89 from the upright shaft 59 to a shaft 90.
  • a bevel gear 91 on the shaft 90 meshes with a bevel gear 92 on a jack shaft 93 to drive a further timing belt drive 94 for a lower input roller 24A which mounts the lower input roller 24.
  • the lower input roller shaft 24A is connected by gears 95 and 96 to an upper input roller shaft 25A which mounts the upper input roller 25.
  • the cassette 21 has a frame, indicated generally at 97, with a plurality of sides including a rear side 98, lateral sides 99 and 100, and a front side 101.
  • a spindle 102 is mounted on the rear side 98, there is a strip outfeed opening 99A in the lateral side 99, and the front side 101 consists of a pair of doors 103 on hinges 104 mounted on the lateral sides 99 and 100.
  • the spindle 102 receives a reel 105 of the corrugated strip S.
  • Upper mounting brackets 106 and lower brackets 107 detachably connect the cassette 21 to the frame 23 of the curling unit 20, with the strip outfeed opening 99A immediately adjacent the input rollers 24 and 25.
  • the opening 99A is a pair of strip guide rollers 108-l09 which have a nip coplanar with that of the input rollers 24 and 25 when the cassette is mounted upon the curling frame 23.
  • the end of the strip When a new reel 105 of corrugated strip S is mounted in the cassette, the end of the strip must be guided through the nip of the guide rollers 108-109, through the nip of the input rollers 24-25, and through the nip of the output rollers 27-28. The end of the strip is then fed into tangency with the curling die roller 99, or alternatively to the inner side of a bending roller if that is used, as hereinafter described.
  • the guide rollers 108-109 assure that it will be properly fed into the infeed rollers 24-25 as the outer diameter of the strip remaining on the reel decreases.
  • the front doors 103 are opened, the exhausted reel is removed and a full reel is placed on the spindle 102, and the new strip is threaded through the guide rollers 108-109, etc.
  • a mechanism 110 for locking together overlapping layers of the corrugated strip as it is being formed into a flexible tube The lower output roller 27 has subportions 27B and 27C which are spaced to provide a gap 27D in which a bushing 111 is mounted on the lower output shaft 27A.
  • the bushing carries a crimping wheel consisting of a collar l12 and several equally spaced bifurcated crimping spokes 113 having resilient arms 113A and 113B of spring steel which normally abut the adjacent ends of the subportions 27B and 27C.
  • the crimping wheel rotates generally with the lower output roller 27, though it may rotate relative to the roller.
  • a pair of lands Ll and L2 of the upper roller 28 which are spaced by double the width of a corrugation, contact respective camming surfaces 114 and 115 of the arms 113A and l13 B to force the arms toward one another so that respective opposed crimping jaws 116 and 117 of said arms firmly pinch the overlapping plies of the flexible tube to crimp and lock said plies together into the shape shown.
  • the pinching action of the jaws l16 and 117 is released as continued rotation of the outfeed rollers 27 and 28 drive the spoke 113 out of the nip of the rollers.
  • a circumferential rib 118 which provides an anvil to prevent buckling of the walls of the corrugated strip as the lock is formed.
  • the spacing of the resulting locks about the periphery of the tube is determined by the spacing of the arms 113 about the collar 112.
  • each of the spokes 113 of the crimping wheel may consist of a single spring arm which is moved against and crimps the plies of the corrugated strip from one side only.
  • successive spokes would consist of an arm corresponding to an arm 113A and an arm corresponding to an arm 113B, so that successive spokes would be moved against the plies of the strip from opposite directions.
  • the curling die is adjustable so that it may fabricate flexible tube from about 50.8 mm (2 inches) to about 508 mm (20 inches) in diameter. If a tube to be fabricated is to have a diameter in the extreme lower part of this range, then the rollers 29 and 35 must be removed as illustrated in Fig. 13.
  • the bending device 119 comprises a pivoted plate 119a which is mounted upon the gear housing 41 coaxial with the lower outfeed roller 27.
  • a gear segment 120 on the plate 119a meshes with a worm 121 that is formed upon a manually rotatable spindle 122.
  • a bending roller 123 is journaled upon a spindle on the plate l19a where it normally occupies an operative position between the nip of the infeed rollers 27-28 and the first curling die roller 29.
  • a bending pin 124 may also be used with the bending roller 123.
  • the bending device 119 When or not the bending device 119 is used during a curling operation depends both upon the diameter of the tube being formed and upon the stiffness of the material in the strip S.
  • the least expensive of suitable aluminum stock which is available in the U.S. market is of the stiffness used in the standard aluminum foil trays in which frozen foods are packaged. That material is stiff enough that the bending device 119 desirably is used regardless of the diameter of the tube that is being formed.
  • the manually rotatable spindle 122 with its worm 121 is used to locate the roller 123 in the proper position between the rollers 27-28 and the first idler roller 29 or 30, as the case may be.
  • any aluminum strip which is softer than that used for freezer trays must be custom fabricated, and it is thus enormously more expensive.
  • the bending device 119 is required only for the fabrication of tubes smaller than about 76.2 mm (3 inches); and for larger tubes the bending attachment may be swung entirely out of the way by turning the spindle 122.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
EP83305425A 1982-09-28 1983-09-15 Vorrichtung zur Herstellung flexibler, gewellter Rohre Expired EP0104844B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US42553282A 1982-09-28 1982-09-28
US425532 1982-09-28
US52109083A 1983-08-10 1983-08-10
US521090 1983-08-10

Publications (3)

Publication Number Publication Date
EP0104844A2 true EP0104844A2 (de) 1984-04-04
EP0104844A3 EP0104844A3 (en) 1984-07-11
EP0104844B1 EP0104844B1 (de) 1987-07-15

Family

ID=27026718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83305425A Expired EP0104844B1 (de) 1982-09-28 1983-09-15 Vorrichtung zur Herstellung flexibler, gewellter Rohre

Country Status (5)

Country Link
EP (1) EP0104844B1 (de)
CA (1) CA1231006A (de)
DE (1) DE3372446D1 (de)
DK (1) DK445083A (de)
ES (1) ES8502356A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0201729A2 (de) * 1985-04-12 1986-11-20 Horst Hano Vorrichtung zur Herstellung von Wickelrohr sowie Wickelrohr
WO2001032327A1 (en) * 1999-11-05 2001-05-10 Lindab Ab System and method for corrugating spiral formed pipe
GB2433453A (en) * 2005-12-23 2007-06-27 Iti Scotland Ltd An apparatus for and method of manufacturing helically wound structures
CN102284580A (zh) * 2011-06-20 2011-12-21 石家庄巨力科技有限公司 一种大型波纹管成型机
CN110014659A (zh) * 2019-04-19 2019-07-16 常州机电职业技术学院 一种超声波卷管机
CN111940541A (zh) * 2020-08-07 2020-11-17 陶海东 薄壁金属板螺旋对焊风管成型机组自动调整模具

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3472463A (en) * 1968-02-13 1969-10-14 Richard M Fedor Cartridge unit for coils
GB1182116A (en) * 1966-03-02 1970-02-25 Westerbarkey Westaflex Improvements in or relating to liner tubes of thin sheet metal or foil.
DE1752513B2 (de) * 1968-06-08 1973-01-25 Berliner Maschinenbau-Ag, Vorm. L. Schwartzkopff, 1000 Berlin Schraubennahtrohrwerk mit mehreren, auf einem kreisumfang verteilten formund fuehrungsrollen
GB1460875A (en) * 1974-05-09 1977-01-06 Pacific Roller Die Co Inc Conduit making machine with diameter control and method
US4058997A (en) * 1974-11-13 1977-11-22 Emil Siegwart Apparatus for manufacturing tubes
US4141385A (en) * 1972-07-17 1979-02-27 Emil Siegwart Flexible corrugated tube
US4197728A (en) * 1978-09-11 1980-04-15 Mcgowen Lloyd E Flexible piping method and apparatus of producing same
DE2835024B1 (de) * 1978-08-10 1980-04-17 Csepel Muevek Egyedi Gepgyara, Budapest Einrichtung zum Formen von Spiralnahtrohren aus Stahlband bzw. Blech

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1182116A (en) * 1966-03-02 1970-02-25 Westerbarkey Westaflex Improvements in or relating to liner tubes of thin sheet metal or foil.
US3472463A (en) * 1968-02-13 1969-10-14 Richard M Fedor Cartridge unit for coils
DE1752513B2 (de) * 1968-06-08 1973-01-25 Berliner Maschinenbau-Ag, Vorm. L. Schwartzkopff, 1000 Berlin Schraubennahtrohrwerk mit mehreren, auf einem kreisumfang verteilten formund fuehrungsrollen
US4141385A (en) * 1972-07-17 1979-02-27 Emil Siegwart Flexible corrugated tube
GB1460875A (en) * 1974-05-09 1977-01-06 Pacific Roller Die Co Inc Conduit making machine with diameter control and method
US4058997A (en) * 1974-11-13 1977-11-22 Emil Siegwart Apparatus for manufacturing tubes
DE2835024B1 (de) * 1978-08-10 1980-04-17 Csepel Muevek Egyedi Gepgyara, Budapest Einrichtung zum Formen von Spiralnahtrohren aus Stahlband bzw. Blech
US4197728A (en) * 1978-09-11 1980-04-15 Mcgowen Lloyd E Flexible piping method and apparatus of producing same

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0201729A2 (de) * 1985-04-12 1986-11-20 Horst Hano Vorrichtung zur Herstellung von Wickelrohr sowie Wickelrohr
EP0201729A3 (de) * 1985-04-12 1987-04-29 Horst Hano Vorrichtung zur Herstellung von Wickelrohr sowie Wickelrohr
WO2001032327A1 (en) * 1999-11-05 2001-05-10 Lindab Ab System and method for corrugating spiral formed pipe
GB2433453A (en) * 2005-12-23 2007-06-27 Iti Scotland Ltd An apparatus for and method of manufacturing helically wound structures
GB2433453B (en) * 2005-12-23 2010-08-11 Iti Scotland Ltd An apparatus for and method of manfacturing helically wound structures
US8955362B2 (en) 2005-12-23 2015-02-17 Iti Scotland Limited Apparatus for and method of manufacturing helically wound structures
CN102284580A (zh) * 2011-06-20 2011-12-21 石家庄巨力科技有限公司 一种大型波纹管成型机
CN102284580B (zh) * 2011-06-20 2014-01-01 石家庄巨力科技有限公司 一种大型波纹管成型机
CN110014659A (zh) * 2019-04-19 2019-07-16 常州机电职业技术学院 一种超声波卷管机
CN111940541A (zh) * 2020-08-07 2020-11-17 陶海东 薄壁金属板螺旋对焊风管成型机组自动调整模具

Also Published As

Publication number Publication date
DK445083D0 (da) 1983-09-28
ES525975A0 (es) 1985-01-01
EP0104844A3 (en) 1984-07-11
ES8502356A1 (es) 1985-01-01
DK445083A (da) 1984-03-29
EP0104844B1 (de) 1987-07-15
CA1231006A (en) 1988-01-05
DE3372446D1 (en) 1987-08-20

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