RU2120492C1 - Gas-thermal covering applying apparatus - Google Patents

Abstract

FIELD: equipment for preparing surfaces for spraying. SUBSTANCE: apparatus has protective grid-type shell with movable cover, part to be recovered, detachable containers for storing substandard abrasive, conical hopper for storing standard abrasive, hopper cover, pneumatic cylinder, precision piston positioned for movement within pneumatic cylinder and abutting against spring with rigidity adjusted by nut, shotblasting gun and pneumatic control valve. Supports of protective shell connected with shotblasting gun are pivotally connected with faceplate and tail spindle. Lower part of protective shell is rigidly connected with cover of hopper disposed below chamber and connected with nonstandard abrasive containers. Pneumatic control valve is mounted on control panel and connected via delivery hoses with compressed air source, pneumatic cylinder and shotblasting gun. Pneumatic cylinder is mounted for movement along guiding beam rigidly fixed in upper part of heat-and-soundproof chamber. Shotblasting gun is connected via intake hose with conical hopper, which is provided with auxiliary delivery hose. EFFECT: wider operational capabilities and enhanced reliability in operation. 2 cl, 8 dwg

Description

 The invention relates to techniques for applying thermal spray coatings, as well as for preparing the surface for spraying.

 A known installation for applying thermal coatings containing a heat and sound insulating chamber with a plasmatron located inside, a carriage with a drive for its reciprocating movement along the guides installed on the outside of the chamber, a reciprocating drive for the plasmatron along the axis of the spindle, the oscillating mechanism of the plasma torch, made in the form interchangeable disk cams and a spring-loaded lever with a roller [1].

 However, this installation has limited technological capabilities.

 Closest to the technical nature of the present invention is an installation for applying thermal coatings, for example, plasma spraying and abrasive blasting surfaces containing a heat and sound insulating chamber, front and rear headstock with a common axis of the centers, a guide for moving the back headstock, a drive carriage mounted for movement transverse to the axis of the centers, a table with elements for fastening flat products fixed on a guide tailstock mounted on a carriage One transverse reciprocating movement of the rod with a gun with a device for changing the stroke of the rod, a sliding heat and sound insulating device and a hollow pusher, inside which the rod is mounted with the possibility of movement along its axis, while a window covering the cross section of the table is made in the tailstock, transverse drive the reciprocating movement of the rod and its guide are mounted on the outside of the camera, a through slot is made in the rear wall of the camera parallel to the axis of the centers , Overlapped sliding insulating device communicating with the hollow plunger [2].

 The disadvantage of this installation is the design complexity, which at the same time does not allow sequentially to perform the operations of shot peening and applying a thermal coating. For this reason, the time interval between shot blasting and spraying remains large; over this time interval, the thickness of the oxide film on the treated surface increases, reducing the adhesive strength of the sprayed coating and the quality of the restored part as a whole.

 The invention is aimed at expanding the technological capabilities of the installation.

 This is achieved by the fact that the installation is equipped with a lattice protective casing with a movable cover, inside which the restored part is placed, removable containers of substandard abrasive, a cone-shaped hopper of an air-conditioning abrasive, a hopper cover, a pneumatic cylinder consisting of a cylinder and a movable precision piston mounted on it, supported on a spring, the rigidity of which is regulated by a nut, a shot-blast gun and a pneumatic control valve, while the supports of the trellised protective casing connected to with a shot-blast gun, pivotally connected to the faceplate and quill, the lower part of the protective casing is rigidly connected to the lid of the hopper located under the chamber and connected to the containers of substandard abrasive material, and the pneumatic control valve is installed on the control panel and is connected by pressure hoses to a source of compressed air, a pneumatic cylinder, which movably mounted on a guide beam rigidly mounted in the upper part of the heat and sound insulating chamber, and a gun connected to a conical hopper by means of boric sleeve, wherein the conical hopper installation provided with a further discharge hose.

 A significant difference from the prototype is that the installation is equipped with a lattice protective casing with a movable cover, removable containers of substandard abrasive, a cone-shaped hopper of a conditioned abrasive, a hopper cover, a pneumatic cylinder consisting of a cylinder and a movable precision piston placed in it, supported on a spring, the rigidity of which is adjustable nut, shot blast gun and pneumatic control valve.

 The claimed installation meets the category of "novelty" and allows us to conclude that the criterion of "significant difference".

 In FIG. 1 shows the proposed installation - front view; figure 2 - the proposed installation is a left view; figure 3 - remote element I in figure 1; figure 4 - remote element II in figure 5 - remote element III in figure 2; in FIG. 6 - remote element IV in figure 1; in Fig.7 - remote element V in Fig. 2; on Fig - remote element VI in figure 2.

 Installation for applying a thermal coating contains a heat and sound insulating chamber 1 (Fig. 1) mounted on a bed 2, a spindle 3 rotation mechanism with a faceplate 4 having a common horizontal axis with a pin center 5, a trellised protective cover 6 with a cover 7, a shot blast gun 8, a pneumatic cylinder 9 (FIG. 2), connected to the holder of the gun 10 (for example, a plasma torch) and mounted in the upper part of the chamber on the guide beam 11, a cone-shaped hopper of a conditioned abrasive 12 (FIG. 1) with a cover 13, containers for substandard abrasive 1 4, a control panel 15 on which a pneumatic control valve 16 is installed (FIG. 2), a chamber door 17.

 The spindle rotation mechanism consists of an electric motor 18 (Fig. 1), a belt drive 19, a gearbox 20.

 The lattice protective casing 6 with the cover 7 is made of metal mesh with a cell diameter of 1.5 mm and, at the points of contact with the faceplate and the center of the pin, are equipped with felt seals 21 (Figs. 3, 4). The lattice protective casing is welded to the lid of the hopper 13 (figure 2).

 The pneumatic cylinder consists of a cylinder 22 (Fig. 5) and a precision piston 23 located therein, resting on a spring 24, the rigidity of which is regulated by a nut 25. A plasmatron holder 10 is fixed to the piston bottom and is fixed by a lock nut 26.

 The cone-shaped hopper 12 (FIGS. 1 and 6) comprises an intake sleeve 27 and an additional pressure sleeve 28.

 The pneumatic control valve 16 consists of an air distribution shaft 29 (Fig. 7), in which axial and radial holes are made, and a cylinder 30 with radial holes "a" and "b". The pneumatic control valve is connected by transport sleeves 31, 32 and 33 with a source of compressed air, a pneumatic cylinder 9 and a shot blast gun 8 (figure 2). The shot blast gun is also connected by the transport sleeve 24 to the intake sleeve 27.

 To ensure suction from the chamber of the cleaning products and gases, the installation is equipped with a ventilation sleeve 35 (figure 2).

 To prevent the abrasive from falling outside the casing during shot blasting of parts, the cover of the casing 7 is equipped with a steel cord 36.

 Installation works as follows.

 In the initial state, the pneumatic control valve is in the off position, in which the radial hole of the air distribution shaft 29 (Fig. 7) is not aligned with the radial holes "a" and "b" of the cylinder 30, and the spindle drive mechanism is turned off.

 Detail 37 (figure 1), to be restored by thermal spraying, is placed in a protective casing and fixed in the faceplate. The cover of the casing 7 is thus closed. The nozzle of the bead-blasting gun 8 (Fig. 2) is placed in the joint between the cover of the casing 7 and the casing 6 opposite the treated area and is held by the installation operator.

 For shot blasting, the parts include a spindle drive mechanism and a shot blast gun. To turn on the bead-blasting gun, set the pneumatic control valve to the position in which the radial bore of the air distribution shaft 29 is aligned with the radial bore "a" of the cylinder. In this case, compressed air is supplied to the conveying sleeve of the shot blast gun 33 and the pressure hose 28. Compressed air passing through the channel “into” the shot blast gun creates a vacuum in the channel “g” (Fig. 8), as a result of which the shot is sucked from the hopper 12 and the intake hose 27 is fed into the channel "g". Abrasive, leaving channel "g", falls into channel "c". A stream of compressed air passing through the channel "b" accelerates the abrasive and feeds it to the workpiece.

 Fraction, hitting the surface of the workpiece, activates it and, bouncing, falls to the bottom of the trellised protective casing. Conditioned abrasive (with a diameter of d≤1.5 mm), as well as cleaning products are sifted through the casing cells, fall on the hopper lid and poured into containers of substandard abrasive. When filling containers of substandard abrasive, they are removed and cleaned.

 When shot blasting, the radial hole "b" of the pneumatic control valve is closed and the piston 23 of the pneumatic cylinder 9, pressed by the spring 24, is in the upper position (figure 5).

 To complete the bead-blasting treatment, the control valve is set to its initial position, the gun is removed from the junction of the cover and the casing, and it is placed on the hopper cover.

 For applying a thermal spray coating, the cover of the protective trellised casing is opened and the pneumatic control valve is turned on in a position in which the radial bore of the air distribution shaft is aligned with the bore of cylinder 30 (Fig. 7). In this case, compressed air enters the pneumatic cylinder, acts on the piston 23 (Fig. 5), overcomes the resistance of the spring 24 and moves it together with the plasma torch holder to the lower position. The distance from the cutoff of the plasma torch to the sprayed surface of the part is regulated by changing the stiffness of the spring 24. The spring stiffness is regulated by the nut 25. After the plasma torch holder is installed in the lower position, the power source of the plasma torch is turned on, the sprayed material is supplied and a layer of thermal spray coating of the required thickness is applied. To finish the coating, the power source, the supply of the sprayed material are turned off, the spindle drive mechanism is turned off and the pneumatic control valve is set to its original position.

 The application of the proposed installation will allow bead-blasting processing of the part and its spraying at one workplace. This will ensure a minimum time interval between the preparation of the part and the coating, which will increase the strength of the sprayed coating and the quality of the restored part as a whole.

Claims (2)

 1. Installation for applying thermal spray coatings, such as plasma spraying, and shot peening of sprayed parts, comprising a heat and sound insulating chamber, a front and rear headstock with a common axis of centers and a plasma torch, characterized in that it is provided with a trellised protective casing with a movable cover, inside which is restored part, removable containers of substandard abrasive, conical hopper of conditioned abrasive, hopper cover, pneumatic cylinder, consisting of a cylinder and placed in a movable precision piston resting on a spring, the stiffness of which is regulated by a nut, a bead-blasting gun and a pneumatic control valve, while the supports of the trellised protective casing connected to the bead-blasting gun are pivotally connected to the faceplate and pinole, the lower part of the protective casing is rigidly connected to the hopper cover, placed below the chamber and connected with containers of substandard abrasive, and the pneumatic control valve is installed on the control panel and connected to pressure hoses with a source compressed air, pneumatic cylinder, which is movably fixed on the guide beam, rigidly mounted in the upper part of the heat and sound insulation chamber, and a gun connected to a conical hopper by means of a fence sleeve.  2. Installation according to claim 1, characterized in that the conical hopper of the installation is equipped with an additional pressure sleeve.

Images