SU1447935A1 - Line for electrolytic working of inner surface of pipes - Google Patents

Abstract

The invention relates to equipment for applying electroplating, such as zinc, to the inner surface of small diameter steel pipes in ferrous metallurgy and can be used in other parts of the industry. The purpose of the invention is to increase the productivity of: the quality of pipe processing. With the passage of current in the baths 4 with anode baskets 12, the electrodes 10 charge W / y f 4 I ...., H t are cathode and a coating is deposited on them. At the same time, in bath 2, electrodes 10 are charged anodically and they dissolve the coating metal (previously deposited in bath 4). The metal passes to the cathode — the inner surface of the tube 27. Thus, a bipolar SUBSTANCE OF THE ELECTRICALLY 10 is carried out through the electrolyte without contact of the current supply. ) they are pressed by the magnetic field created by the magnets 23. In the bath 4, the metal is deposited on that part of the electrodes 10, which will be equidistant to the pipes 27 when the processing cycle follows, when these electrodes 10 in the container 7 are set a day to an adjacent bath 2. The design features allow the line to improve the coating quality by reducing scatter in the thickness range 34-50% and 1.5-1.6 times increase process throughput. 1 hp f-ly, 4 ill. "J, 4 (L: & with O9 SP f47. ...., H Zoog zf VJ Fig.z

Description

The invention relates to equipment for applying electroplating, such as zinc, to the inner surface of small diameter steel pipes in ferrous metallurgy and can be used in other industrial zones.

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The purpose of the invention is to increase the productivity and quality of pipe processing.

Fig. 1 is a schematic diagram of the LINE} in Fig. 2 - a galvanic bath for coating the inner surface of pipes with a container, a longitudinal section; on fig.Z - scheme of the supply of current to the pairs of electroplating baths; figure 4 - the container on the stand of the loading-unloading, General view.

The line consists of an auto-operator 1 (a gantry, bridge or gantry lifting device with hoisting-and-transport mechanisms and a command vehicle - not shown), baths 2 for galvanic treatment of the inner surface of pipes, baths 3 for galvanic treatment of the outer surface of pipes, baths 4 for the preparation of soluble anodes, baths 5 for chemical processing, for example, passivation of pipes, stands 6 of loading and unloading of pipes from containers 7 with transducers of obliquely located rollers 8 from electric motors 9 in containers 7 of them Electrodes 10 and holder 11 are mounted. Anodic baskets 12 are installed in baths 3 and 4. Baths 2 and 4 are equipped with connecting wires 2. Overs 13 (Fig. 13), flexible cables 14, tips 15 with a drive 16, supplying electrolyte tubes 17 with flexible hoses 18 from electrolyte circulation systems with pumps (not shown), coupling mechanisms 19. The electrodes Yu have insulators 20. Baths 2 have cathode current leads 21 in compartments 22 of non-magnetic material in which magnets (or electromagnets) 23 are located, sources 24 of direct current with a control system (not shown), a switching device 25, and current leads 29 (fig.Z).

The pipes 27 processed in the container 7 are fixed in the holders 11 and 28, the electrode 10 is fixed in the holder 11 by means of a clamp 29, and in the holder 28 a channel 30 is made,

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connected to an electrolyte circulation system (not shown). The loading-unloading stand 6 is equipped with a drive roller table 31 for feeding pipes 27 and deflecting rollers 32 with springs 33 for supporting electrodes 0 at the time of loading pipes 27 into the container 7.

Line plating of pipes works in the following way. Pre-prepared pipes 27 are individually loaded at stand 6 into container 7. For this, pipe 27 on drive rollers 8 is inserted into container 7 until it stops in holder 11. At that, pipes 27 are rotated around the axis, since the drive rollers 8 are installed at an acute angle to the axis of movement of the pipes 27. The container 7 is transferred by the operator 1 and installed in the bath 2. In the adjacent bath 4, the operator 1 sets the container 7, but without the pipes. Auto operator 1 is released for other operations. In the baths 2 and 4, the drives 16 are turned on. In this case, the tips 15 of the conductors 13 are connected to the electro-. 10, and the mechanisms 19 of the junction with the holder 11. The electrolyte circulation system and the switching-on device 25 are turned on with the current applied.

The inner surface of the pipes 27 is coated in baths 2. Baths 2 and 4 work together from a single current source, since the current is closed according to the scheme (Fig. 3): current sources 24 - anode baskets 12 - electrolyte in bath 4 - electrodes 10 bath 4 - conductors 13 - flexible cables 14 - tips of conductors 15 - electrodes 10 in bath 2 - electrolyte in bath 2 - processable pipes 27 - cathode current leads 21 - current leads 26 - current sources 24. When current flows in bath 4, electrodes 10 are charged cathodically and a coating is deposited on them. At the same time, in the bath 2, the electrodes 10 charge anodically; the metal of the coating (previously deposited in the bath 4) dissolves from them. The metal passes to the cathode — the inner surface of the pipe 27. Thus, a bipolar supply of electricity through the electrolyte occurs. without contact current supply to the electrodes 10,

In the bath 2, the pipes 27 are rotated around the electrodes lOj while the pipes 27 are to

cathode current leads 21 are pressed by the magnetic field created by the magnets 23, reliable contact is made. Since the cathode current leads 21 are distributed along the length of the tube 27, the current supply is dispersed, which provides a more uniform metal deposition on the inner surface of the processed tubes 27, Since there are no anode baskets 12 in the bath 2, no metal is deposited on the cathode current leads 21 (and no dendrites form ) the contact points on the outer surface of the pipes do not burn. In the bath 4, the metal is deposited on that part of the electrodes 10, which is equidistant to the pipes 27 during the next processing cycle, when this container 7 with pipes 27 is is inserted into the adjacent bath 2. The metal-coated portion of the electrodes 10 are soluble anodes for the subsequent processing cycle. Thus, containers 7 alternately (in cycles) are interchanged in adjacent bathrooms: with pipes 27 in bath 2 and without pipes in bath 4. Anode baskets 12 in baths 4 are installed along the length of electrodes 10 at different distances to them, which allows It is necessary to regulate and ensure uniformity of the inner surface of the pipes 27 along their length. The irregularity of metal deposition around the perimeter on soluble anodes, the areas of electrodes 10, is leveled by coating the pipes 27 due to their rotation.

In pairs of baths 2 and 4, you can close the current with electrodes 10 with the HELP of the leads of the conductors 15 on the one hand or with the help of similar conductors from two sides. With a two-way circuit, a higher uniformity of the coating along the length is achieved, but the design of the baths becomes more complicated.

In order to control the uniformity of the coating along the length, first on the electrodes 10 (and then on the treated pipes 27) in Vine 4, the anode baskets 12 are installed along the length of the bath with different distances from the electrodes 10. In connection with the use of electrolytes with poor scattering ability, different electrode shells The distances significantly affect the thickness of the metal deposits. Thus, exhibited anode baskets 12 in some areas

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closer to the electrodes 10, it is possible to achieve uniformity of the coating of the pipes 27 even with one-side current closure. The electrodes 10 are made of a passivating corrosion-resistant material in this electrolyte. When galvanizing such material can be aluminum alloys. Anodically charged, they are passivated; therefore, in those places where zinc dissolves, when electrode 10 serves as a soluble anode in bath 2, the surface of electrode 10 is passivated. This allows in the next cycle to apply -cat zinc on the electrodes 10.

The design features of the t line allow to increase the processing performance by 1.5-1.6 times by reducing the time spent on installation, reducing manual labor for cleaning and changing soluble anodes, due to the possibility of reducing the distance between the electrodes without loss of quality due to uneven coating . At the same time, the quality of the coating is improved, namely, the uniformity of the coating, since the spread of thickness decreases by 34-50%, a more crystalline structure of the precipitate is formed - microspeediness is increased by 6-8%, there are no particles of precipitated anode psham.

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Claims (1)

1. Line galvanic treatment of the inner surface of pipes, containing an auto-operator, chemical treatment baths, electroplating Vansha with an electrolyte circulation system, current sources with a regulating system — NIN, connected by current leads to electrodes, and mechanisms for placing an electrode in a pipe, characterized in that In order to improve the performance and quality of the coating, it is equipped with portable 50 containers with rollers placed in them for loading and holding tubes in containers and baths for preparing soluble anodes, electrodes are rigidly fixed in containers, and 55 bath electrodes for preparing soluble anodes and electroplating baths are electrically connected to each other in pairs by means of a conductor, each of which is bath electrically couples 514479356 connected only with one of the poles 2, Line according to n, 1, about t and h and y - a current source with the possibility of charging with the fact that the electrodes of the conductors of the containers of the containers are bipolar. . non cylindrical.  f7 П ЯП 1 Ю 9 tJ It W f П f f f yy lu a a v i  IL / JL. dJ.  T - yftfia; rta uE2 four : t6 iii 15 7 iO 20 I I t 0 (ie. I 70 T7 7 // / 1 ,, „,, 1,1 /, 1,1„ „„ „„, „„ „,„ 32 cfjue. 11 1  J / 7 18 f