SU1215751A1 - Detonation installation for depositing coats and checking their quality - Google Patents

Description

The invention relates to a gas-thermal coating technique and can be used in machine building, machine tool and machine tool construction for applying detonation coatings and their subsequent quality, as well as to assess the quality of any other thermal coatings.

The aim of the invention is to detect hidden defects in coatings such as peeling and carrying densities at a depth of up to 150 IWKM from their surface.

The drawing shows schematically the proposed installation.

The detonation plant for coatings and quality control contains a barrel 1 with a spark plug 2, a powder dispenser 3 and a 4 gas mixer with valves 5-7 and a control device 8 communicating with it. The source 9 of a continuous high-temperature gas stream and a photo sensor 10 are fixed on the barrel 1 of the plant Various devices can be used to create an intense thermal gas flow, for example a gas burner, a plasma torch, etc. The gas burner is powered by the same sources (cylinders) as the entire installation. The barrel 1, the source 9 of the gas flow and the photo sensor 10 are directed in the same direction. They are arranged in such a way that the optical axis of the photosensor 10 intersects the geometrical axis of the source 9 in the plane of the coating II, and the geometrical axes of the trunk 1 and the source 9 are parallel.

The installation also contains a converter of 11 signals from the photo sensor 10, an electromagnetic relay 12 and a switch 13, one of the fixed contacts of which is connected to the output of the converter il to a second fixed contact a constant voltage, and a relay 12 is connected to the moving contact. dispenser 3, candle 2 and valves 5-7 through the closing contacts 14-16 relay 12.

Detonation installation works as follows.

In the sprayed coating mode, the switch 13 is set to position a, a constant voltage is applied to the relay 12 and it is energized to close its contacts 14-16. This provides a connection to the control unit 8 candles 2, dispenser 3 and valves 5-7. In accordance with the predetermined setting of the command-and-control unit 8, they are activated by the valves 5, 7 and the entry of the explosive

Compiled by L. Yankovska

Editor .A. VorovichTekhred I. VeresKorrektor M. Sa.chborsk

Order 928/7 Circulation 682 Subscription

VNIIPI USSR State Office

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

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(for example, hydrogen-oxygen) mixture into the barrel 1, turning on and then turning off the dispenser 3 for feeding powder 1 into the barrel 1, turning off valves 5, 7 and simultaneously turning on valve 6 through which neutral gas is blown to blow the mixer 4. Then, an explosion of the mixture is initiated, for which, with the commander of apparatus 8, a supply voltage is applied to the candle 2, causing the discharge to be excited in its spark gap. As a result, a stream of coating I is applied to the product AND displaced before the muzzle cut by a stream flowing out of the barrel 1. The valve 6 is then closed and the cycle of operation described is repeated.

When the plant is operating in the quality control mode of the coating, the switch 13 is pre-set to position b. Then a powder is loaded into the dispenser 8, the coating of which differs in color from the previously applied material. After that, the control panel 8 is turned on and a continuous high-temperature gas flow is created with the help of source 9. When this flow (torch flame) is applied to the moving product, heat removal from its surface occurs quickly when the previously applied coating fits tightly to the base material of the product. If the coating contains a microdefect (for example, delamination, pore, etc.), then the heat removal to the product from the coating over the defect is sharply reduced. As a result, this area of the coating is heated by the flame affecting it and becomes a source of light and heat radiation. This radiation is perceived by the photosensor 10, the signal from which, after passing through converter 11 (power amplifier), causes excitation of relay 12. Closing its contacts 14-16 leads to triggering in valve sequence 5-7 of dispenser 3, spark plug 2 described earlier and spraying the coating mark on the area of the product containing the coating with a macrodefect. The speed and direction of movement of the product And is set so that during the time required for the operation of these devices, the defective area moves to the muzzle of the barrel 1.

The described apparatus is applicable for spraying coatings and detecting hidden macrodefects located both at a relatively shallow depth (10-20 microns) and much farther from the surface (at a depth of up to 150 microns).

Claims (1)

DETONATION INSTALLATION FOR SPRAYING COATINGS AND MONITORING THEIR QUALITY, comprising a barrel with a spark plug, a gas mixer with valves, a powder batcher, a photosensor mounted on the barrel, a signal transducer of the photosensor, an electromagnetic relay and a command device connected to the converter, electrically connected through the gate mixer, dispenser and candle, characterized in that, in order to detect hidden defects of coatings such as peeling and discontinuities at a depth of 150 microns from their surface, it is equipped with a continuous high-temperature gas flow source mounted on the barrel, the photosensor being placed so that its optical axis intersects the geometric axis of the gas flow source in the plane of the controlled coating. <p I * *