GB2102309A

GB2102309A - Detonation coating apparatus

Info

Publication number: GB2102309A
Application number: GB08121498A
Authority: GB
Inventors: Valery Stepanovich Klimenko; Vasily Georgievich Skadin; Evgeny Arkadievich Astakhov; Sergei Anatolievich Khlebnikov; Anatoly Ivanovich Zverev; Vladimir Vasilievic Gavrilenko; Alla Lukinichna Borisova
Original assignee: TS K BJURO LENINSKAYA KUZNITSA
Current assignee: TS K BJURO LENINSKAYA KUZNITSA
Priority date: 1981-07-13
Filing date: 1981-07-13
Publication date: 1983-02-02
Also published as: GB2102309B

Abstract

In an apparatus for detonation coating comprising a body (1) carrying a barrel (2) equipped with an electric igniter (3), a powder batch meter (4), a gas mixer (5), a mechanism is provided to adjust automatically the relative positions of the apparatus and the workpiece (9) after each operation. The mechanism comprises a spring-loaded member (11) mounted at the outlet of the barrel (2) and displaceable by the gas stream emanating from the barrel. The return movement of the member (11) under the action of the spring (13) causes the relative positions of the apparatus and workpiece to be adjusted, e.g. by rotating the workpiece or by driving wheels on which the apparatus is carried. <IMAGE>

Description

SPECIFICATION Apparatus for detonation coating The present invention relates to equipment for applying a coating using the high-temperature spraying technique, and is specifically concerned with apparatus for detonation coating. The invention can be used to best advantage in the aircraft and spacecraft industries, machinebuilding industry, shipbuilding industry, etc.

According to the invention there is provided a detonation coating apparatus for applying a coating to a workpiece, comprising a barrel including means to ignite an explosive charge received in the barrel to expel coating material through an open end of the barrel and to workpiece, drive means for relatively displacing the apparatus and the workpiece, and springloaded means mounted adjacent the open end of the barrel and displaceable against said spring loading by the stream of gas emanating from the barrel, said spring-loaded means being coupled to said drive means for return movement of said spring-loaded means by said spring loading to reposition the apparatus and workpiece relative to each other ready for the next operation of the apparatus.

Under the action of the detonation wave the spring-loaded means is displaced. When under the action of the return spring this means is forced back to its initial position it causes the drive means to adjust the relative positions of the apparatus and the workpiece, ready for the next operation. Since the positioning drive utilizes the energy of the detonation waves, it cannot operate in the case of a misfire, which provides for a uniform thickness of the coating being formed even when misfires occur.

If coating relatively small round workpieces such as shafts, axles, sleeves, etc., it is expedient that said drive means be arranged to rotate the shaft of the face plate mounting the workpiece with the aid of a gearing. In this case after each shot the spring-loaded means while being forced back to its initial position rotates the face plate with the workpiece fixed thereon to a new position.

In the case of applying coating onto large and heavy workpieces it is useful that the apparatus be fitted with wheels, and at least one of which wheels be connected with the drive means. In the case when the spring-loaded means is driven by the return spring to its initial position it causes displacement of the apparatus relative to the workpiece for the length of one pitch, with the workpiece remaining in its fixed position.

The spring-loaded means may take the form of a pivotally mounted flap member and in a preferred construction is adapted to rotate a shaft coupled to the drive means through an overrunning clutch.

It is also expedient that the spring-loaded means be constructed in the form of two semicylindrical baffles mounted on rotatable levers, which levers are connected with one another through an elastic member and the baffles are so arranged that when brought together they form a passage coaxial with and opposite the barrel bore, which passage is substantially said hole in said flap. Such arrangement permits the detonation wave energy to be utilized in the most efficient way.

It is advisable that said rotatable levers be movably connected with each other through a gearing, which will favour a dynamic pressure of the detonation wave on the baffles and permits the torque of the output shaft to be increased.

The invention will now be explained in greater detail with reference to embodiments thereof which are represented in the accompanying drawings, wherein: Fig. 1 illustrates the apparatus of the invention for detonation coating; Fig. 2 illustrates a self-moving modification of the apparatus of the invention; Fig. 3 illustrates a modification of the apparatus of the invention, provided with a flap constructed in the form of two semi-cylindrical baffles; Fig. 4 is a sectional view of the baffles along line IV--IV in Fig. 3; Fig. 5 illustrates a movable connection of the rotatable levers.

Detailed Explanation of the Invention An apparatus for detonation coating comprises a body 1 (Fig. 1) on which are mounted a barrel 2 having an electrical discharger 3, a powder batch meter 4 and a gas mixer 5. The powder batch meter 4 and the gas mixer 5 are communicated through branch pipes 6 and 7 with the barrel 2.

The apparatus also includes a positioning drive 8 mounted on the body 1 and adapted to move the apparatus and a workpiece 9 relative each other.

The positioning drive 8 has an output shaft 10, and according to the invention is constructed in the form of a springloaded flap 11 mounted at the outlet of the barrel 2. The flap 11 is secured on the shaft 12 and is held in its initial position by the spring 13. At the both sides from the flap 11 on the body 1 are mounted end stops 14 and 15 defining end positions of the flap 1 The spring 13 holds the flap 11 against the stop 1 5. In the flap 11 is provided a hole opposite the barrel 2 outlet, after which hole 1 6 is positioned the workpiece 9. The positioning drive 8 also has an overrunning clutch 1 7 through which the shaft 12 is coupled with the output shaft 10.The overrunning clutch 1 7 may be variously otherwise constructed provided that it is capable of transmitting rotational movement from the shaft 12 to the output shaft 10 only when the flap 11 is driven into its initial position, that is to the stop 1 5.

It is quite clear that the output shaft 10 can be used for moving either the workpiece or the apparatus. In the modification of the apparatus shown in Fig. 1 the workpiece 9 is fixed on the face plate 1 8 having its shaft 1 9 mounted on the body 1 of the apparatus. The output shaft 10 is movably connected with the shaft 1 9 through a gearing 20.

The modification of the apparatus shown in Fig.

2 is intended for applying a coating onto large, heavy workpieces, for instance, onto a section of the ship shell or aircraft skin. The body 1 is mounted on wheels 21. According to the invention at least one of these wheels 21 is movably connected with the output shaft 10. In this modification the shaft 1 2 is connected with the overrunning clutch 1 7 through a pair of bevel pinions 22. The output shaft 10 is connected with the wheel 21 through flexible member 23. As the flexible member 23 use may be made of a cable, chain, belt (preferably V-shaped).

According to the modification of the apparatus shown in Fig. 3 the flap 11 is constructed in the form of two semi-cylindrical baffles 24 and 25 (see also Fig. 4). When being brought together the semi-cylindrical baffles 24 and 25 form a passage coaxial with the barrel 2 bore and is substantially the hole 1 6 provided in the flap 11. The baffles 24 and 25 are mounted on rotatable levers 26 and 27 respectively, which levers are connected with each other through an elastic member 28 which perform the same function as the spring 1 3 in the modification shown in Fig. 1. These levers are mounted on the shafts 12 and 29. Thus, the shaft 12 of the lever 26 is mounted to transmit rotational movement to the shaft 10.

In the preferred embodiment of the invention (Fig. 5) the rotatable levers 26 and 27 are movably connected to each other, which is attained by that the shafts 12 and 29 are provided with segment gears 30 and 31 which are in engagement with each other.

The proposed apparatus operates as follows.

When a metered out amount of powdered coating material to be bonded to the workpiece 9 is delivered from the batch meter 4 through the branch pipe 6 into the barrel 2 whereinto through the branch pipe 7 from the gas mixer 5 is also delivered a gas mixture (Fig. 1) the electric discharger 3 operates to ignite the gas mixture inside said barrel 2. As a result of detonation, the detonation products together with the powdered coating material travel towards the workpiece 9.

When the detonation wave-front reaches the flap 11 the latter under the action of the gas stream is forced to the stop 14. The output shaft 10 remains at rest. Having passed through the hole 1 6 the gas stream carrying the powdered coating material impinges upon the surface of the workpiece 9 thereby causing the particles to have a bond therewith to form a coating thereon.Thereafter, the flap 11 under the action of the spring 13 rotates to take its initial position, that is end position at the stop 1 5. While rotating under the action of the spring 13 the flap 11 rotates the shaft 12 which, through the overrunning clutch 17, imparts the rotational motion to the output shaft 10 which in turn rotates through a gearing 20 the shaft 1 9. While rotating the shaft 19 causes the face plate 1 8 with the workpiece 9 fixed therein to rotate to a length of one pitch, so that the next successive section of the workpiece 9 is positioned against the barrel 2. In the same way the positioning drive operates during the next successive shots.

The apparatus shown in Fig. 2 operates in a similar manner as disclosed above with the difference that when the flap 11 is driven by the spring 1 3 to its initial position the rotational motion from the output shaft 10 is transmitted through the flexible connection 23 to the wheel 21 which causes the whole apparatus to move along the workpiece 9.

Referring now to Fig. 3, the modification of the apparatus shown therein operates substantially as the modification described above. During detonation a portion of the energy of the detonation wave is received by the baffles 24 and 25 which are caused, as a result, to move apart from each other, thereby rotating correspondingly the rotatable levers 26 and 27 (positions to which they are moved are shown by the dot-and-dash line). When under the action of the elastic member these levers are moving back they rotate the shafts 12 and 29. From the shaft 12 the rotational motion is transmitted through the overrunning clutch 1 7 to the output shaft 10.

In the preferred embodiment of this modification the rotational movement of these levers is synchronized by the segment gears 30 and 31 (Fig. 5) which allows the most efficient utilization of the energy received by the baffles 24 and 25.

The rotation of the output shaft 10 in the modifications shown in Fig. 3 and Fig. 5 can be used either to move the face plate (Fig. 1) or to drive the wheel 21 (Fig. 2).

This invention may be variously otherwise embodied within the scope of the appended

Claims

claims. CLAIMS

1. A detonation coating apparatus for applying a coating to a workpiece, comprising a barrel including means to ignite an explosive charge received in the barrel to expel coating material through an open end of the barrel and to the workpiece, drive means for relatively displacing the apparatus and the workpiece, and springloaded means mounted adjacent the open end of the barrel and displaceable against said spring loading by the stream of gas emanating from the barrel, said spring-loaded means being coupled to said drive means for return movement of said spring-loaded means by said spring loading to reposition the apparatus and workpiece relative to each other ready for the next operation of the apparatus.

2. A detonation coating apparatus according to claim 1, wherein the spring-loaded means is adapted to rotate a shaft which is coupled to the drive means through an overrunning clutch.

3. A detonation coating apparatus according to claim 1 or 2, wherein the spring-loaded means is located in front of the barrel and defines a hole aligned with the barrel opening.

4. A detonation coating apparatus according to claim 1,2 or 3, wherein the spring-loaded means is a pivotally mounted flap member.

5. A detonation coating apparatus according to any one of claims 1 to 4, wherein a support is provided for mounting the workpiece and is arranged to be rotated by the drive means which includes a gear train.

6. A detonation coating apparatus according to claim 1 or 2, wherein said spring-loaded means comprises a pair of semi-cylindrical baffles mounted on respective pivotal levers interconnected by a spring member, the baffles when brought together under the action of the spring member defining a through passage coaxial with the barrel.

7. A detonation coating apparatus according to claim 6, wherein said levers are coupled together through a gearing.

8. A detonation coating apparatus according to claim 1, 2, 3 or 6, wherein the apparatus is mounted on wheels and at least one of said wheels is arranged to be driven by said drive means.

9. A detonation coating apparatus substantially as herein described with reference to the accompanying drawings.