EP0184093A1 - Procédé et dispositif pour le chauffage de pièces allongées par passage direct du courant électrique - Google Patents

Procédé et dispositif pour le chauffage de pièces allongées par passage direct du courant électrique Download PDF

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Publication number
EP0184093A1
EP0184093A1 EP85114896A EP85114896A EP0184093A1 EP 0184093 A1 EP0184093 A1 EP 0184093A1 EP 85114896 A EP85114896 A EP 85114896A EP 85114896 A EP85114896 A EP 85114896A EP 0184093 A1 EP0184093 A1 EP 0184093A1
Authority
EP
European Patent Office
Prior art keywords
strand
goods
liquid contacts
liquid
electrically conductive
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Withdrawn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
EP85114896A
Other languages
German (de)
English (en)
Inventor
Klaus-Michael Dr. Ing. Petzold
Bernd Dipl.-Ing. Fölber
Gregor Dipl.-Phys. Müller
Gerald Dipl.-Ing. Werthmann
Roland Dipl.-Ing. Lippmann
Werner Prof. Dr. Ing. Schirmer
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.)
VEB Draht- und Seilwerk Rothenburg
Original Assignee
VEB Draht- und Seilwerk Rothenburg
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
Priority claimed from DD27036884A external-priority patent/DD248476A3/de
Priority claimed from DD27512185A external-priority patent/DD236116A1/de
Application filed by VEB Draht- und Seilwerk Rothenburg filed Critical VEB Draht- und Seilwerk Rothenburg
Publication of EP0184093A1 publication Critical patent/EP0184093A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/62—Continuous furnaces for strip or wire with direct resistance heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/0004—Devices wherein the heating current flows through the material to be heated
    • H05B3/0009—Devices wherein the heating current flows through the material to be heated the material to be heated being in motion

Definitions

  • the invention relates to a method and a device for the conductive heating of stranded goods using at least two liquid contacts which transmit the electric current from solutions or melts of salts, acids or bases, one or at least two stranded goods running side by side being heated simultaneously.
  • the invention is applicable in the field of metallurgy, but also in other fields of technology, in which strand-like goods, such as wires, pipes, strips, rods, rods and ropes made of metallic materials for the purpose of influencing materials, such as annealing, tempering, hardening, Patentieen, thermomechanical treatment, etc. are conductively heated.
  • the technologically necessary heating temperature is generally set by regulating the electrical voltage applied to the strand-shaped article.
  • Mechanical (DD-WP 59 880) or liquid contacts are used for voltage transmission.
  • liquid contacts that contain molten metals as contact media (DD-WP 160 550 1 DE-OS 1 583 406). Although these contacts have good electrical transmission properties and a uniform heating temperature can be achieved in the strand-shaped material, the high material costs, the high energy expenditure for melting and keeping the contacts melted, the toxicity of the fumes of some metal melts as well as partial aggressiveness towards the tub material are with this type of liquid contacts disadvantageous.
  • a method and a device for patenting steel wires is known, the steel wire being guided in a straight line through a preheating trough containing a salt bath and then through a patenting trough also containing a salt bath, and an electrical voltage is applied between the two troughs.
  • the preheating or patenting tank consists of one above the other arranged top and bottom tub. These two tubs are connected by a pump which returns the salt bath that has flowed out of the upper tub and at the same time circulates the salt bath, so that local overheating of the bath is avoided.
  • the preheating trough or the patenting trough can each consist of three troughs arranged in parallel and insulated from one another, to each of which a phase of a three-phase network is connected.
  • liquid contacts from solutions or melts of salts, acids or bases When using liquid contacts from solutions or melts of salts, acids or bases, it also shows that as a result of the poorer electrical conductivity of these contact media compared to metal melts, a voltage drop occurs in the transmission of the electrical energy to the goods to be heated in the liquid contact medium itself, which leads to heating of the liquid contact.
  • liquid contacts from solutions or melts of salts, acids or bases do not produce almost point-like current transmission, as is characteristic when using metal melts, but a much larger distance in liquid contact is required for the current transmission to the strand-like material. This and the heating as well as concentration fluctuations and possibly electrolytic decomposition of the contact media result in uncontrollable fluctuations in the heating temperature of the strand-like material.
  • DE-AS 2 356 003 has therefore proposed solutions for regulating the heating temperature which are based on a targeted change in the conductivity of the contact medium.
  • This known method can be implemented technically only with great effort, since several storage and circulation systems for the contact media are required, which must be regulated individually and depending on one another. However, such systems are prone to failure and have long control times. Controlling the heating temperature is even more problematic if several stranded goods arranged next to one another are to be heated at the same time.
  • DE-OS 2 538 045 discloses a device for the simultaneous heating and / or annealing of a plurality of strand-shaped goods passing through the device, in which a separate measuring and regulating device is provided for each strand-shaped article, with which separate regulation of the goods applied electrical voltage, a regulation of the glow path length or regulation of the throughput speed takes place.
  • the disadvantage of this known device is that the separate regulation of the annealing path length and the use of different throughput speeds of stranded goods running side by side require a relatively high outlay in terms of equipment, since entire parts of the system can be displaced relative to one another or the extraction devices must be equipped with individual drives.
  • the integration of movable storage in the system to compensate for differences in length is also complex and requires additional space.
  • the separate regulation of the electrical voltage also has the disadvantages of voltage regulation already described when using liquid contacts from solutions or melts of salts, acids or bases and is also associated with additional high technical outlay.
  • this solution makes it possible to drive several stranded goods together and lead them through two electrolyte containers arranged one after the other and to apply the same voltage to all goods.
  • the invention has for its object to provide a method and an apparatus for the conductive heating of strand-like goods using at least two current-transmitting liquid contacts from solutions or melts of salts, acids or bases, which in a simple manner a uniform and the same defined final temperature or the stranded goods to be heated.
  • the object is achieved in that the heating temperature is regulated by changing the contact length of the stranded goods in one or more liquid contacts from solutions or melts of salts, acids or bases by the method for the conductive heating of several stranded goods and / or that the stranded goods be guided past special electrically conductive elements in the at least two necessary liquid contacts to ensure almost uniform current transmission at the same distance.
  • the transformer voltage is maintained unchanged in accordance with the respective heat treatment to be carried out and during the conductive heating.
  • a uniform heating temperature within a single strand in multi-strand layers and the same heating temperature of several strand-shaped goods with one another by changing the contact length of the strand-shaped goods and at the same time by passing special electrically conductive elements in the liquid contacts.
  • the heating temperature is controlled exclusively by changing the contact length in one or more liquid contacts.
  • a third variant is characterized in that the stranded goods in the liquid contacts are guided past special electrically conductive elements with the same distance, whereby an almost uniform current transmission is ensured even without separate regulation of the applied voltage for the individual stranded goods, which in turn is a prerequisite for the Achieving a uniform heating temperature.
  • the heating temperature is the same and uniform achieved in that parts of the finite strand-like goods are discontinuously immersed in the liquid contacts at the same distance from electrically conductive elements and heated stationary, and gradually, z. B. in the lifting step method through the device.
  • the liquid contacts can be heated to a certain temperature and / or more than two liquid contacts are run through in succession.
  • specific treatments of the strand-like goods such as surface cleaning, surface coating and diffusion annealing, are possible in addition to the actual heating.
  • Salt melts or salt solutions are advantageously used as contact medium for the implementation of the method.
  • the device for performing the method is designed so that to change the contact length of the bezw.
  • the strand-like goods one or more immersion or guiding devices in one or more liquid contacts from solutions or melting of salts, acids or bases are horizontally and / or vertically adjustable with respect to one another or individually and / or that known measuring, control and regulating devices set a defined level in the liquid contacts and / or that one or more in the liquid contacts parallel to the longitudinal axis or strand-like goods electrically conductive plates are arranged which separate the stranded goods from one another at least in a liquid contact.
  • the two liquid contacts that are required for the current transmission are directly electrically conductively connected to a voltage source.
  • the electrically conductive plates are flat or curved. Some of the electrically conductive plates can also be space limitations of the liquid contacts, e.g. B. floor or walls.
  • the distance between the electrically conductive plates and the continuous strand-like material can be changed.
  • the electrically conductive plates can also be designed to be pivotable.
  • the electrically conductive plates are connected in a directly electrically conductive manner to the voltage source for the continuous heating.
  • This arrangement is also advantageous if different heating temperatures are necessary to achieve specific material properties in the individual strands.
  • the dipping or guiding devices can consist of electrically non-conductive material, which ensures that no current is transmitted to the strand-like material through these devices and that they can only serve as a guiding element for the strand-like goods,
  • the liquid contacts consist of a plurality of self-contained chambers which are electrically conductively connected to one another and contain different contact media from solutions or melts of salts, acids or bases with the same or different temperatures.
  • the method and the device according to the invention enable simple regulation of the heating temperature for conductively heated strand-like goods.
  • Through continuous power transmission and through the targeted change of the contact length of the strand-like goods it is possible to achieve a defined end temperature of all goods as well as a uniform temperature within a strand.
  • the application of the invention enables fast control times and leads to one Energy saving and quality improvement of the goods to be treated. Easily manageable mechanical devices, particularly in multi-strand systems, can reduce the expenditure on power electronics and material-intensive electrical components, such as control transformers and the like. ⁇ . are significantly reduced.
  • an unalloyed carbon steel wire is to be heated continuously to the austenite temperature corresponding to the carbon content, 24 wires being treated simultaneously in the heat treatment system.
  • the basic structure of the device is shown in FIG. shown with 4 parallel wires.
  • the device consists of a first liquid contact 2, in which an aqueous salt solution 3 with a temperature of 80 ° C. is contained and a second liquid contact 5, which at the same time contains the quenching medium in the form of a molten salt 6 with a temperature between 400-500 ° C.
  • a first liquid contact 2 in which an aqueous salt solution 3 with a temperature of 80 ° C. is contained and a second liquid contact 5, which at the same time contains the quenching medium in the form of a molten salt 6 with a temperature between 400-500 ° C.
  • three flat electrically conductive plates 4 are arranged so vertically that they run parallel to the direction of travel (see arrow) of the wires 1 and separate them from one another.
  • Dipping or guiding devices 9 and 10 are also arranged in the upper area of the first liquid contact 2, two of these devices 9 and 10 being provided for the reception of a wire 1.
  • the dipping or guiding devices 9 and 10 are designed in the form of rollers and have a groove
  • the diving or guide devices 9 and 10 consist of an electrically non-conductive material and are horizontally and vertically adjustable relative to one another.
  • a further electrically conductive plate 8 is arranged at an angle so that it runs parallel to the direction of passage of the wires 1.
  • This second liquid contact 5 also contains a deflection device 7c approximately in the middle of the liquid level.
  • the first and second liquid contacts 2 and 5 are connected to a common voltage source with an AC voltage of 40 V, which remains unchanged during operation. The applied voltage is guided by the strand-like to be treated good and the technical parameters and is used when shooting the furnishedbe - action fixed. This also applies to the following examples.
  • the wires passing through at the same speed are patented as follows: the wires 1 first pass through the first liquid contact 2, being guided through the dipping or guiding devices 9 and 10 in a horizontal direction below the level of the aqueous saline solution 3 and with this immediately Are in contact. The wires 1 are guided past the electrically conductive plates 4 at the same distance. By connecting the first liquid contact 2 to the voltage source, the current required to heat the wires 1 is transmitted to the wires 1 via the aqueous salt solution 3 and the electrically conductive plates 4.
  • the described arrangement of the electrically conductive plates ensures an almost uniform current transmission to the wires 1.
  • the heating temperature for forming the austenite is adjusted by changing the contact length of the wires 1 within the aqueous salt solution 3. This is done by a horizontal shift of the diving or. Guide devices 9 and 10, whereby the contact length of the wires 1 can be changed between 0.2 and 1.0 m, which corresponds to a heating temperature range of 750 ° C to 950 ° C. After the wires 1 have emerged from the first liquid contact 2, they reach the second liquid contact 5 via deflection devices 7a, b, which contains the molten salt 6 at a temperature between 400-500 ° C.
  • the wires 1 are guided past this second liquid contact 5 at an equal distance from an obliquely arranged electrically conductive plate 8, as a result of which a uniform current transfer to the wires 1 also takes place in the second liquid contact 5. It is essential here that the wires 1 in the second liquid contact 5 must be guided almost parallel to the plate 8 at least on the inlet side. With this device, it is possible to reliably ensure the requirements for maintaining the austenitizing temperature of ⁇ 10 ° C. in all wires 1 treated at the same time.
  • the device consists of a first liquid contact 12, in which a molten salt with a temperature of 350-600 ° C. is contained, and a second liquid contact 14 with an aqueous salt solution, which is kept at the temperature necessary for the heat treatment purpose.
  • first liquid contact 12 three flat, electrically conductive plates 13 are arranged vertically so that they run parallel to the direction of travel (see arrow) of the steel strips 11 and separate them from one another.
  • immersion or guide devices 16, 17a and 17b which have already been described in Example 1.
  • the difference to the embodiment variant according to FIG. 1 is that in this example only the dipping or guiding devices 16 and 17a are adjustable in the horizontal direction.
  • three further electrically conductive plates 15 are arranged so vertically that they run parallel to the direction of passage of the steel strips 11 and separate them from one another.
  • the first and second liquid contacts 12 and 14 are connected to a common AC voltage source.
  • the steel strips 11 when the steel strips 11 are heated, they first run through the first liquid contact 12 at a throughput speed of 20 m / min for the purpose of preheating.
  • the steel strips 11 are introduced into the molten salt on the inlet side and horizontally by the immersion or guide devices 16 and 17a Direction continued.
  • the steel strips 11 pass through the electrically conductive plates 13 at the same distance.
  • the heating temperature of the austenitic steel strips 11 is set by changing the contact length within the molten salt. This is done by a horizontal displacement of the diving or guiding devices 16 and 17a.
  • the steel strips 11 After the steel strips 11 have emerged from the first liquid contact 12, they pass through a deflection device into the second liquid contact 14, which contains an aqueous salt solution.
  • the dipping or guiding devices 17c arranged in the upper region of the second liquid cone 14 the strips 11 are immersed in the aqueous salt solution and are guided past the electrically conductive plates 15 at an equal distance, as a result of which even in this contact a uniform current transfer to the strips 11 is guaranteed.
  • the immersion or guide devices 17c contained in the second liquid contact 12 are not adjustable in this example, so that the heating temperature is set exclusively in the first liquid contact 12 is done.
  • This embodiment variant enables a simultaneous heat treatment of a plurality of steel strips 11 in one device, with uniform heating or quenching within each strip and equal heating or quenching of all strips with one another being able to be maintained.
  • the basic structure of the device is shown in Figures 3 to 5.
  • the device consists of a first liquid contact 18, in which an aqueous salt solution 23 with room temperature is contained and a second liquid contact 21, which contains an acid 24 with a temperature of 40-90 ° C.
  • a first liquid contact 18 in which an aqueous salt solution 23 with room temperature is contained and a second liquid contact 21, which contains an acid 24 with a temperature of 40-90 ° C.
  • a plurality of flat electrically conductive plates 20 arranged parallel to the direction in which the reinforcing steel wires 19 pass.
  • the immersion or guide devices 25 in the form of deflection rollers which are designed to be vertically adjustable.
  • Each steel wire 19 is assigned a deflection roller.
  • immersion or guide devices 26 and 27 are provided in one plane, which are not adjustable. Parallel to the direction through which the reinforcing steel wires 19 pass curved electrically conductive plates 22 are arranged, which separate the steel wires 19 within the second liquid contact 21.
  • the reinforcing steel wires 19 are introduced into the aqueous salt solution 23 via deflection rollers arranged on the inlet side, which are not identified in the drawing, and are continued on the outlet side via the dipping or guiding devices 25 and further deflection rollers.
  • the steel wires 19 pass through the electrically conductive plates 20 at the same distance.
  • the heating temperature of the concrete steel wires 19 is adjusted by changing their contact length within the aqueous salt solution 23. This is done by a vertical adjustment of the immersion or stirring devices 25 or by a targeted adjustment of the liquid level of the aqueous salt solution 23 with the aid of measuring, control and regulating devices known per se (not shown in the drawing).
  • Such a situation could be, for example, that at the beginning of the heating, that is to say when a multi-line system is started up, the heating temperature is initially achieved by vertical adjustment of the immersion or.
  • the associated device consists of three liquid contacts.
  • the first and second liquid contacts are designed in accordance with the embodiments of the liquid contacts 2, 12, 14, 18 or 21 shown in FIGS. 1 to 5, the structure of the third liquid contact corresponds to the liquid contacts 14 and 18 described. All three liquid contacts contain as Contact medium a concentrated aqueous salt solution, e.g. B. NaCl, NaNO 3, etc.
  • this is drawn off from a coil at 30 m / min and electrically contacted without deflection in the first liquid contact by means of the concentrated aqueous salt solution, which has boiling temperature and flows around the wires on all sides.
  • the contact length of the wires in the first liquid contact is 1.5 m.
  • a second liquid contact of the same type in which concentrated salt solution flows around the wires. The length of this second liquid contact is 0.5 m.
  • the wires between the two liquid contacts are heated to 880 ⁇ 10 ° C and convert to martensitic on entry into the second liquid contact.
  • the wires run into the third liquid contact via an inlet roller, which has a length of 1.2 m and a depth of 1 m.
  • an inlet roller which has a length of 1.2 m and a depth of 1 m.
  • a dipping or guiding device in the form of a deflection roller for each wire, which is vertically displaceable by 0.8 m.
  • the wires are heated from 0.05 m to 420 ° C. at a depth of immersion of the deflection roller of the third liquid contact in the concentrated aqueous salt solution .
  • the wires are tempered so that their tensile strength is 1400 MPa.
  • the wire is heated to 650 ° C and is thereby given a tensile strength of 900 MPa.
  • the device consists of two liquid contacts 30, in which a molten salt with a temperature of 350 ° C. is contained.
  • a molten salt with a temperature of 350 ° C. is contained in the liquid contacts 30, two flat electrically conductive plates 31 are arranged vertically so that they run parallel to the axis of the rods 28 and separate them.
  • the two liquid contacts 30 are connected to a common AC voltage source.
  • a transport device 29 is provided, which feeds the rods 28 to the liquid contacts 30.
  • the rods 28 When the rods 28 are glowing, they are conveyed through the transport device 29 to the two liquid contacts 30 and set there, e.g. B. always three rods with their ends immersed in the liquid contacts 30 so that the ends of the rods 28 parallel to the electrically conductive plates 31 be find and are completely surrounded by the molten salt.
  • the liquid contacts 30 By connecting the liquid contacts 30 to the voltage source, the current required for heating is transmitted via the molten salt and the plates 31 to the three rods 28, whereby an almost uniform current transmission can take place. After the required annealing temperature has been reached, the bars 28 are lifted from the liquid contacts 30 in batches with the aid of the transport device 29 and conveyed onward for cooling. At the same time, the liquid contacts 30 are loaded again by the transport device 29.
  • This design variant makes it possible to ensure a uniform and identical heating temperature in all three rods over their entire length. .

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP85114896A 1984-12-06 1985-11-25 Procédé et dispositif pour le chauffage de pièces allongées par passage direct du courant électrique Withdrawn EP0184093A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DD27036884A DD248476A3 (de) 1984-12-06 1984-12-06 Vorrichtung zur kontinuierlichen konduktiven erwaermung von strangfoermigem gut
DD270368 1984-12-06
DD27512185A DD236116A1 (de) 1985-04-12 1985-04-12 Verfahren und vorrichtung zur temperaturregelung bei konduktiver erwaermung strangfoermiger gueter
DD275121 1985-04-12

Publications (1)

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EP0184093A1 true EP0184093A1 (fr) 1986-06-11

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EP85114896A Withdrawn EP0184093A1 (fr) 1984-12-06 1985-11-25 Procédé et dispositif pour le chauffage de pièces allongées par passage direct du courant électrique

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110586411A (zh) * 2019-09-18 2019-12-20 江苏兴达钢帘线股份有限公司 一种钢帘线连续作业线溶液槽控制装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2164850A (en) * 1936-03-10 1939-07-04 Ira Crouse Method of conditioning chrome alloy wire and apparatus for the practice of said method
DE879390C (de) * 1942-11-25 1953-06-11 Westfaelische Union Ag Elektrische Widerstandserhitzung zur Durchfuehrung der Luftverguetung beim Patentieren von Stahldraht
DE941089C (de) * 1954-04-20 1956-08-02 Walter Dr-Ing Reinecken Kontaktvorrichtung fuer die Zuleitung elektrischer Stroeme an bewegtes, metallischesProfilmaterial
FR1127668A (fr) * 1954-07-19 1956-12-21 Procédé et installation perfectionnée pour la recuisson et le doublage, notamment pour le zingage, de fils tréfilés et laminés en fer ou en acier et de produits analogues
DE1583406A1 (de) * 1967-11-15 1970-08-13 Siemens Ag Anordnung zum Waermebehandeln von Stranggut durch elektrische Widerstandserhitzung
FR2226472A1 (fr) * 1973-04-20 1974-11-15 December 4 Drotmuevek
DE2538045A1 (de) * 1975-08-27 1977-03-10 Henrich Kg Vorrichtung zum gleichzeitigen erwaermen und/oder gluehen von mehreren durch die vorrichtung laufenden strangfoermigen guetern

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2164850A (en) * 1936-03-10 1939-07-04 Ira Crouse Method of conditioning chrome alloy wire and apparatus for the practice of said method
DE879390C (de) * 1942-11-25 1953-06-11 Westfaelische Union Ag Elektrische Widerstandserhitzung zur Durchfuehrung der Luftverguetung beim Patentieren von Stahldraht
DE941089C (de) * 1954-04-20 1956-08-02 Walter Dr-Ing Reinecken Kontaktvorrichtung fuer die Zuleitung elektrischer Stroeme an bewegtes, metallischesProfilmaterial
FR1127668A (fr) * 1954-07-19 1956-12-21 Procédé et installation perfectionnée pour la recuisson et le doublage, notamment pour le zingage, de fils tréfilés et laminés en fer ou en acier et de produits analogues
DE1583406A1 (de) * 1967-11-15 1970-08-13 Siemens Ag Anordnung zum Waermebehandeln von Stranggut durch elektrische Widerstandserhitzung
FR2226472A1 (fr) * 1973-04-20 1974-11-15 December 4 Drotmuevek
DE2538045A1 (de) * 1975-08-27 1977-03-10 Henrich Kg Vorrichtung zum gleichzeitigen erwaermen und/oder gluehen von mehreren durch die vorrichtung laufenden strangfoermigen guetern

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110586411A (zh) * 2019-09-18 2019-12-20 江苏兴达钢帘线股份有限公司 一种钢帘线连续作业线溶液槽控制装置

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