SU931795A1 - Apparatus for applying powder coating to inner surface of products - Google Patents

Description

in which it is not characterized by obtaining the exact size.

The purpose of the invention is to improve the quality of the coating and dimensional accuracy.

The goal is achieved by the fact that a device for coating a product on the inner surface of a product, comprising a housing with U-shaped annuli and chambers and a central channel, a hopper with nozzles for feeding powder material, is equipped with side nozzles arranged in an X-ring annularly parallel to the axis of the device, deforming elements located in the annular chamber, and additional nozzles for supplying gas and hot mixtures, are located on the tangential axis of the device.

The annular chamber is divided by a shoulder, made in the form of a truncated cone, with channels for the supply of burning gas and powder in it.

The outer part of the collar is made removable and with a wear-resistant coating.

FIG. 1 shows a device, a longitudinal section f in FIG. 2 shows a section A-A in FIG. 1 in FIG. 3 is a sectional view of FIG. in fig. 4 - raerez bb In figure 1.

The device consists of a housing 1, annular chambers 2 and 3 with pores ak and deforming elements, respectively, and having tangential nozzles 4 and 5 for supplying the gas mixture under pressure to the corresponding annular chambers 2 and 3, side nozzles b for supplying combustible gas from channel 7 with combustible gas and a central channel 8 for supplying a gas mixture, kraaak 9, with a central hole 10 and side nozzles 11, brackets 12, a central nozzle IJ for supplying a gas mixture to channel 8, a nozzle 14 for supplying combustible gas to channel 7, nozzles 15 dl under chi nopotima, hopper 16 for Pors ika, the deformation elements 17, the removable vurtika 18 teploizb irukvdey liner 19.

The device works as follows.

Once a mixture through the central pipe 13 under pressure enters the main channel 8 and through the tangential nozzles 4 and 5 is supplied to the ring ioies He chambers 2 and 3, respectively. A portac mixture is also supplied to the annular chamber 2 through nozzles 15, which accelerate to high speeds (on the order of 5 thousand rev / min) by a vortex jet of the gas mixture and, due to the combustion of the combustible mixture supplied through the side nozzles 6, are applied to internal surface. The shoulder 18 in the axial movement of the device removes redundant

the powder particles and calibrate the sprayed surface, preparing it for plastic deformation, and the deforming elements 17, rolling around on the still deposited plastic layer, compressed it due to centrifugal inertia forces arising from their movement (rolling) on the surface.

The gas mixture through the opening 10 is also supplied to the nozzles 11, which provide a clean rolling of the deforming elements over the sprayed / layer, without contact with the end face of the cover. 9 during the axial feed of the tool.

Thus, the deformed elements 17 when they are run in contact at one point with the surface to be treated. Their slippage relative to the sprayed layer is absent and its formation occurs in the absence of tangential forces due to uniform loading in the direction normal to the surface being rolled.

The combustible mixture is fed into the channel 7 of the combustible mixture through the nozzle 14. The thermal insulating pad 18 serves to protect the tool body from direct contact with the flame. Compressed air can be used as the gas mixture. If necessary, additives are added to it that improve the combustion process of the combustible mixture, in which the mixture of acetylene with oxygen or propane with oxygen can be used.

The angle of inclination of the side nozzles 6 arranged normally to the truncated cone is chosen with this. it is calculated that their axis of symmetry intersects with the axis of symmetry of the tangent nozzles 4 at a point at a distance of 3–8 mm from the surface of the product. This provides the optimum heating temperature for powder particles up to 300-400s during the last stage of their movement, which, in combination with their high speed, provides good coating quality, and also provides preheating of the surface for spraying to ensure good adhesion of the powder particles to the substrate. The combination of high kinetic energy of the particle before its contact with the sprayed surface with heating. The surface itself and the particle makes it possible to reduce the heating temperature of the powder and, thus, preserve its chemical composition and physico-mechanical characteristics.

Claims (3)

Invention Formula A device for coating powder on the inner surface of the product, comprising a housing with U-shaped annular chambers and a central channel, a hopper with nozzles for feeding powder material, characterized in that, in order to improve the quality of the coating and dimensional accuracy, it is equipped with side nozzles, located in an annular chamber parallel to the axis of the device, deforming elements arranged in an annular chamber, and additional nozzles for supplying the gas and combustible mixture disposed tangentially from ositelno axis of the device. 2. The device according to Claim 1, in which the annular chamber is divided by a shoulder, is made, 17  CVX ,, / X / -XX C X X / X Xg W / b-lr b; / in the form of a truncated cone, with channels for the supply of combustible gas and powder in it. 3. The device according to claim 2, wherein the outer part of the collar is removable and wear-resistant. Sources of information taken into account in the examination 0 1. The UK patent 1077632, cl. From 7 F, 1964. 2. USSR Author's Certificate No. 588010, cl. B 05 B 7/20, 1977 .. 3. USSR author's certificate 5 No. 556845, B 05 B 7/20, 1976. tf  /// U //// fig.Z