RU2313618C2 - Tube metallization plant - Google Patents

Abstract

FIELD: plant for metallization of tubes, possibly in building industry branches for protecting against corrosion, atmosphere and soil erosion of cast iron tubes including tubes of high strength cast iron with spheroidal graphite, steel and alloys, concrete, plastic-concrete and asbestos-cement tubes having flanged or flared ends.

SUBSTANCE: plant includes mechanism for feeding tubes, movable carriage, apparatus for metallization with spraying heads and mechanism for removing tubes. Movable carriage has autonomous drive for linearly moving it and drive for rotating tubes; both drive units are made with possibility of controlling respectively linear and angular motion speeds of movable carriage and tubes relative to spraying heads of metallization apparatus depending upon diameter of tubes and quantity of applied coating during process of reciprocation or translation motion of carriage. Tube rotation drive unit may be reversed for applying coating at mutually parallel or crossing arrangement of turns of coating. Apparatus may have three spraying heads in spraying unit with common control system for applying laminate composition coating at mutually parallel or crossing arrangement of turns of coating. Such plant allows apply coating onto tubes with diameter up to 600 mm and simultaneously on two tubes with diameter difference up to 60 mm.

EFFECT: improved efficiency of plant.

4 cl, 2 dwg

Description

The invention relates to the application of protective and decorative (including zinc and zinc-aluminum) coatings by metallization by sputtering by electric arc or gas thermal methods and can be used to protect pipes from cast iron, including high-strength cast iron with corrosion, from soil and soil erosion nodular graphite (VChShG), steels and alloys, as well as concrete, plastic and asbestos cement, having a flange and / or socket at the ends of the pipes.

A known metallization line of cylindrical products containing racks for laying and unloading pipes, a roller table, drying chambers, brush cleaning, shot blasting, metallization successively installed along it, a coating sealing unit, an unloading mechanism that allows spray coating to be applied by metallization [1] (see a .s. SU 1819910 A1).

The disadvantage of this line is the complex process flow diagram.

A known metallization line of cylindrical products with a diameter of up to 168 mm, containing sequentially installed loading, pipe cleaning, metallization and unloading devices, live rolls, a mechanism for the task of the working rotation speed and longitudinal pipe feed, two pipe sending mechanisms (pipe loading and unloading) and an unloading device [ 2] (see AS su 1139767 A), adopted as a prototype.

However, this production line only processes smooth cylindrical products and does not allow metallization of the surface of cylindrical products (pipes) made of cast iron, including high-strength cast iron with spherical graphite (VChShG), steels and alloys, as well as concrete, plastic and asbestos cement, having pipe ends flange and / or socket. A common disadvantage of the above prototypes is that the cycle (time of the full cycle of the pipe processing) does not allow their use in the continuous technological process of pipe production.

The objective of the present invention is to achieve a technical result by creating a metallization installation of two pipes at the same time, providing high-quality characteristics of the applied coating by choosing a metallization technology that allows one-and multi-layer composite coatings on pipes having flange and / or socket ends and a molding slope of the outer surface along the entire length, with the possibility of operation, installation both independently and in technological lines of casting a wide range of pipes in continuous vnom process of production.

In a particular case, when a metallization installation is built into any existing pipe molding production line, a pipe metallization installation is mounted in the pipe quality control zone between the exit from the annealing furnace and the conveyor, while maintaining the existing standard mechanism for stepwise feeding pipes to the movable carriage of the metallization installation and removing pipes from the carriage after its return to its original position. The supply of pipes to the movable carriage and their removal are carried out by one mechanism of step-by-step pipe feeding.

In this case, the metallization unit (Fig. 1) contains a series of installed existing pipe annealing furnace 1, an existing step-by-step feeding mechanism and a pipe removal mechanism 2, a movable carriage 4, a metallization device 5 with spraying heads, an existing transfer technological conveyor of the finished product 6.

The movable carriage 4 (figure 2) contains an autonomous drive 7 of its linear movement and a drive 8 of the rotation of the pipes, which can be used in reverse or non-reversible design, transmitting rotation through four leading support rollers 9 and four supporting idle rollers 10, with which the pipes weigh provide frictional contact, and the roller stops 11 eliminate the axial displacement of the pipes at high speeds.

A movable carriage with an autonomous drive of its linear movement and a drive of rotation of the pipes is configured to control, respectively, the linear and angular speeds of movement of the movable carriage and pipes relative to the spraying heads of the metallization device 5 depending on the diameter of the pipes and the amount of coating applied during translational or reciprocal movement of the carriage with control of technological parameters both in manual and automatic mode.

In the case of an autonomous use of a metallization installation without being embedded in any technological line, it can be equipped with any mechanisms for feeding and removing pipes from the movable carriage 4.

Spraying heads in an amount of 1 to 3 for each pipe are included in the spraying unit, have their own adjustable power supply units and a single spraying unit control system that allows you to configure the metallization process for each head individually, which makes it possible to simultaneously use several different wire materials with different diameters and perform complex composite pipe coatings, including zinc-aluminum, or aluminum-zinc, or zinc-aluminum-zinc, or aluminum-zinc-aluminum layered coatings Both in manual and automatic mode. For example, to obtain a complex zinc-aluminum-zinc composite coating, spray heads No. 1 and No. 3 are charged with zinc wire of one diameter, and head No. 2 is charged with aluminum wires of a different diameter. In this case, for one direct stroke of the carriage, a three-layer coating is performed with mutually parallel arrangement of turns of the sprayed metals. Or, during the forward stroke of the carriage with pipes, the zinc layer is applied with the No. 1 head, and during the return stroke of the carriage with pipes, without turning on the reverse of the pipe rotation, aluminum is sprayed, then zinc is applied from above. Moreover, the turns of the deposited layers of aluminum and zinc will be cross with respect to the turns of the first layer of zinc, which allows to obtain a more dense structure of the composite coating of pipes.

Installation works as follows.

The pipes 3 coming from the annealing furnace 1 (Fig. 1) with the existing step-by-step feeding mechanism 2 are fed in pairs of 2 pcs. on a movable carriage 4 located in the axis of the processing line. The carriage with pipes is moved by its autonomous drive 7 (FIG. 2) to the metallization device 5. Simultaneously with the beginning of the linear movement of the carriage, the pipe rotation drive 8 (FIG. 2) is turned on, transmitting rotation to them through the support rollers 9 and 10 on which the pipes lie.

A protective or protective-decorative metal coating is applied by spraying heads (up to 3 on each pipe) with a forward and / or reverse stroke of the movable carriage 4. Reversing a controlled pipe rotation drive during the reverse stroke (when leaving the metallization zone) of the movable carriage allows applying coating with mutual parallel or cross arrangement of the coils of spraying.

After completing the working cycle of coating pipes, the movable carriage 4 is returned to its original position in the axis of the production line, the existing step-by-step feeding mechanism 2 pipes are removed from the carriage and transferred to the finished product conveyor 6. Then the cycle of feeding pipes to the carriage and subsequent operations are repeated.

Information sources

1. Copyright certificate SU 1819910 A1, cl. C23C 4/00.

2. Copyright certificate SU 1139767 A, cl. C23C 4/00; B05B 13/02.

Claims (4)

1. Installation of metallization of one or two pipes at the same time, comprising a pipe feed mechanism, a movable carriage, a metallization device with spraying heads and a pipe removal mechanism, characterized in that the movable carriage has an autonomous drive for linear movement thereof and a pipe rotation drive that are operable to control respectively, linear and angular velocities of movement of the movable carriage and pipes relative to the spraying heads of the metallization device, depending on the diameter of the pipes and the amount of coating applied Existence in the process of translational or reciprocal movement of the carriage. 2. The metallization installation according to claim 1, characterized in that the pipe rotation drive is reversible for coating with a mutual parallel or cross arrangement of the turns of the coating. 3. The metallization installation according to any one of claims 1 and 2, characterized in that the metallization device contains up to three spray heads included in the spray unit with a single control system for applying a multilayer composite coating with mutual parallel or cross arrangement of the turns of the coating. 4. The metallization installation according to claim 3, characterized in that the metallization device is configured to apply a multilayer composite coating zinc-aluminum, or aluminum-zinc, or zinc-aluminum-zinc, or aluminum-zinc-aluminum.

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