RU1383583C - Device for depositing coatings by detonation technique - Google Patents

Abstract

. FIELD OF THE INVENTION FIELD OF THE INVENTION This invention relates to a technique for filling elbows with a detonation method. The purpose of the invention is to increase the reliability of the device. For this, the device is equipped with a nozzle connected to the hopper and the powder inlet tube into the barrel, a shut-off cutter under the bottom slab of the latrub and an air inlet fitting. By changing the gap between the cutter and the cut of the latrub and placing the fitting between the cutter and An open cut of the powder inlet tube makes it possible to adjust the supply of the dose of powder and its location in the barrel. 1 C.A.

Description

The invention relates to a technique for spraying coatings by the detonation method and can be used to create coatings on various materials.

The aim of the invention is to increase the reliability of the device.

Fig. 1 shows a general description of a knocking device; in Fig.2 - a fragment of devices with an air inlet fitting, the outlet of which is oriented towards the open cut of the barrel.

The proposed device for detonation spraying of coatings comprises a horizontally placed barrel 1 with a water cooling jacket 2, a gas supply system 3 and a detonation initiation unit 4, in the barrel 1 an open tube of a powder material inlet 5 with a water cooling jacket 6 is arranged coaxially with it.

8 on the opposite end of the tube 6: outside the barrel 1, a vertical dispenser is installed in the form of a hopper 7 with a sprayed powder material connected to a nozzle 8, under the cut of which a cutter 9 is placed in the form of a shelf made with the possibility of axial movement. On the outside of the said hopper there is installed a heat electric heater (TZZh) 10. In the tube 5 of the input of the powder material between the stick E and the open shear, the tube 11 contains the air inlet in the form of a fitting connected to the air line through the throttle 12 and the dialectrical valve 13. block 14 valve control.

The device detonation spraying of coatings works in any of two modes,

1, continuous air operation through valve 13,

The barrel 1 is filled with an explosive gas mixture (for example, stoichiometric, propane-butane-oxygen} with the help of the gas supply system 3. At the same time, air passes through the valve 13 from the line to the powder inlet pipe 5 and then through the valve 13, which is constantly open under the action of the signal from the control unit 14, Near the shelf

9, a pressure zone is created, associated with a change in the initial direction of air movement towards the open cut of the barrel 1. The powder located on no / iOMKe 9 is not involved in the movement. since there is no intensive air movement in the formed zone above the pressure or around the shelf 9. Choke 12 is used to adjust the amount of air supplied that slightly dilutes the explosive mixture. In this case, the dose of powder material heated by the heater 10 to a temperature of 100-150 ° C is on the shelf 9 and in the nozzle 8. After filling

the barrel 1 with an explosive mixture initiates detonation using block 4, the propagation of detonation in the barrel 1 is accompanied by an increase in pressure in the input tube 5 in powder t

0 on the shelf 9, in the pipe 8 and the hopper 7. The movement of air from the nozzle 11 and the gas mixture from the gas supply system 3 is stopped during the pressure increase. After the detonation wave reaches the open cut of the barrel 1 and the arrival of the rarefaction wave in the region of the shelf 9, the pressure begins to relax in the powder, accompanied by the ejection of the latter from the shelf 9 and partially from the pipe 8 and moving

0 dose of powder in the middle of the tube 5 input powder. The restoration of the air flow from the nozzle 11 prevents the powder from being retained in the inlet tube 5 and the dose of the sprayed material enters the barrel 1, where

5 mixes with fresh gas mixture. (The movement of the mixture begins almost simultaneously with the air after the pressure in the barrel 1 drops). At this point in time, when the powder cloud is in the middle part of the barrel 1, detonation is initiated and the first coating layer is sprayed. Next, the stated cycle is repeated many times and subsequent coating layers are sprayed.

5 During spraying, it is possible to adjust both the dose of the powder material and its location in the barrel 1 at the time of initiation of the explosion. This is achieved by changing the gap between the shelf 9 and the cut of the nozzle 8 and as a result of changing the air velocity of the throttle 12, the frequency of the explosion initiation by block 4 and the velocity of the gas mixture by the gas supply system 3; . ,

5 2, Operating mode with pulsed air supply through valve 13,

8 in this mode, the device operates when it is necessary to quickly adjust the duration of the flow of powder into the barrel

0 and, as a consequence, the length of the powder cloud along the barrel at the time of initiation.

The main role in this case is played by the valve control unit 14, which opens and closes the valve 13 simultaneously with the initiation of detonation. The operation of the device in this mode differs from that described above in that the stage of filling the barrel 1c with an explosive mixture using the gas supply system 3, the valve 13 opens by a signal from the control unit 14 before briefly initiating detonation (At 0.1-0.15 s , depending on the frequency of the shots), ensuring the movement of the transporting gas and powder (during the second and subsequent shots) into the barrel 1. Before initiation, the valve 13 is closed, thereby stopping the flow of powder material into the barrel 1, Adjusting the moments about indoor and za-, the valve 13 is mounted an indoor optimal extent of poroschkovogo cloud point in initiating detonation.

Formulas of the invention

Claims (2)

1, A detonation coating spraying device comprising a horizontally placed barrel, a gas supply system, 20 a detonation initiation unit and a powder material dispenser made in the form of a vertically mounted hopper connected to the barrel by a horizontal powder material inlet pipe from the 25th side of the barrel end, opposite to the open one, characterized in that, in order to increase the reliability of work, it equipped with a vertical nozzle, connections5u The operation of the device is characterized by high reliability, caused, on the one hand, by a simple control algorithm from a single repetitive command from the initiation of detonation, and, on the other hand, by the absence of moving parts of the valves working simultaneously with the initiation of detonation. (56) Shorshorov M.Kh., Kharlamov Yu.A. Physicochemical fundamentals of detonation-gas spraying of coatings. M .: Nauka, 1978, p. 168. Fig. 79, building fifteen one end with the lower part of the hopper, and the other with the powder material inlet tube, and under the lower section of the nozzle there is a shut-off cutter with the ability to adjust the gap between them, while directly in front of the shelf between the last and open cut of the powder material inlet tube an air inlet assembly is arranged in the form of a fitting. 2. The device pop. 1, characterized in that the outlet opening of the air inlet fitting is oriented toward the open cut of the barrel. 2   t5 Fig 2