RU48140U1 - PLASMA INSTALLATION - Google Patents

Abstract

The proposed installation relates to the field of plasma technology and is used for coating of wear-resistant and heat-protective materials. The essence of the utility model is that in a plasma installation containing a power source, a gas supply and control unit, a plasma torch, a torch nozzle cooling system, dispensers, a power supply unit based on welding transformers with controlled rectifiers, the torch nozzle channel length is not more than 15 mm, the plasma torch is connected to the manipulators of longitudinal and angular movement.

Description

The proposed installation relates to the field of plasma technology and is used for coating of wear-resistant and heat-protective materials.

Known small-sized installation for gas-flame spraying of metals with wire UGM-1 (Kudinov VV, Bobrov GV Coating by spraying. Theory, technology and equipment. Textbook for universities. - M .: Metallurgy, 1992.- p.274) containing a gas flame sprayer, wire feed mechanism, control panel.

The disadvantage of this installation is that it is designed only for coating of zinc and aluminum and does not allow the application of materials for wear-resistant and heat-protective coatings.

The closest in technical essence is the universal plasma installation UPU-8 M (Kudinov V.V., Bobrov G.V. Coating by spraying. Theory, technology and equipment. Textbook for universities. -M .: Metallurgy, 1992.- p. 271) for applying metal and ceramic powder materials, as well as materials in the form of a wire on the surface of parts and assembly units by plasma spraying. The installation contains a power source, a plasma torch, dispensers, a gas supply and control unit, a wire feeder, a backup console (a remote control to start the installation from the workplace), a plasma torch cooling system and a rectifier for plasma spraying.

The disadvantages of the installation are its large dimensions and mass (the mass of the power source alone is 1100 kg), which makes it unsuitable for transportation and application of thermal coatings

on the working surfaces of large parts directly at the place of their operation. In addition, it does not have devices for moving the plasma torch.

The objective of this utility model is to create a small-sized mobile unit that allows it to be transported directly to the workplaces of large-sized parts and to apply gas-thermal plasma coatings to their work surfaces, excluding the laborious operations of disassembling them.

The problem is solved due to the fact that in a plasma installation containing a power source, a gas supply and control unit, a plasma torch, a burner nozzle cooling system, dispensers, according to a utility model, the power supply is based on welding transformers with controlled rectifiers weighing 15-20 kg, the length of the channel of the burner nozzle is not more than 15 mm, the plasma torch is connected to the manipulators of longitudinal and angular movement.

Figure 1 presents the design of the inventive plasma installation.

The claimed plasma installation consists of a small-sized power source 1, a gas supply and control unit 2, a cooling system for a plasma torch nozzle, including a pump 3 and a pressure switch 4, a plasma torch 5, dispensers 6 and 7, a longitudinal movement manipulator 8, an angular movement manipulator 9, a unit control of the manipulators 10, the dispenser control unit 11. The plasma torch 5 has a small nozzle channel length (not more than 15 mm), which provides high efficiency with a small arc length. As a power source 1, a welding transformer with a rectifier is used. In the installation, small-sized powder dispensers 6 and 7 are used. For moving the plasma torch

small-sized manipulators are used. The gas supply and control unit 2 is simpler than that used in the UPU-8 M.

Mobile universal plasma installation allows you to get a uniform set thickness of the thermal spray coating of the work surface of the part.

Works mobile universal plasma installation as follows. A voltage is supplied to the cathode and anode (nozzle) of the plasma torch from power source 1, a potential difference arises between them - an electric arc. Through the gas supply and control unit 2, a plasma-forming gas is supplied, which, passing through an electric arc under the influence of high temperature, ionizes, forming a plasma stream. From dispensers 6 and 7, a powder material is supplied to the gas-plasma jet, intended for spraying onto the working surface of the part, and is heated to the melting temperature. The directional gas-powder flow thus formed, transferring particles of the sprayed material, creates a gas-thermal coating on the surface of the product. Effective heating of the sprayed materials at an arc voltage of 45-50 V and a current of up to 500 A allows you to get the minimum channel length of the plasma torch nozzle (no more than 15 mm). The nozzle cooling system provides a longer service life and higher efficiency compared to UPU-8 M burners. Small-sized longitudinal and angular manipulators are used to move the plasma torch.

Claims (1)

Mobile universal plasma installation containing a power source, a gas supply and control unit, a plasma torch, a torch nozzle cooling system, dispensers, characterized in that the power unit is based on welding transformers with controlled rectifiers, the torch nozzle channel length is not more than 15 mm, the torch mounted on manipulators of longitudinal and angular movement.