RU2185565C2 - Device for application of protective coat on pipe - Google Patents

Abstract

FIELD: application of protective coats on external surfaces of pipes; application of foaming insulating materials on surfaces of single tubes in stationary molds by double pipe technology. SUBSTANCE: device includes shaping unit with axial hole in front and rear walls, bearing rollers and foaming agent supply units. Movable rear wall is provided with centering unit made in form of washer secured on the outside of rear wall; this washer has bracket running through axial hole in rear wall; bracket is engageable with detachable level retainer mounted in pipe; detachable level retainer in made in form of distance shoes and double-arm lever mounted springily; one arm of lever is engageable with bracket and end of other arm carries bearing member. EFFECT: enhanced efficiency. 7 dwg

Description

 The invention relates to the application of protective coatings on the outer surface of pipes and can be used for applying foaming insulating materials to the surface of single pipes in stationary forms using the pipe-in-pipe technology.

 A device is known for applying a protective coating to a pipe containing a forming agent with an axial hole in the front and rear walls and means for supplying an expandable composition. (Grushman R.P. “What the heat insulator needs to know.” L .: Stroyizdat, 1971, p. 32, Fig. 14).

 The disadvantage of this device is that the pipe after applying a heat-insulating coating on it requires waterproofing and protection from mechanical damage, for example, fixing hard shells on the outer surface, which reduces the productivity and technological capabilities of the device.

 A device for applying a protective coating to a pipe, taken as a prototype, containing a forming tool with an axial hole in the front and rear walls, support rollers and means for supplying a foamable composition. (USSR author's certificate 1171637, class F 16 L 59/14, 1983).

 The disadvantage of this device is the inability to simultaneously perform waterproofing and protect the outer surface of the hardened foam composition from mechanical damage, which negatively affects performance and reduces the technological capabilities of the device.

 The problem solved by the invention is to increase the efficiency of the device.

 The technical essence of the invention lies in the fact that in the device for applying a protective coating to a pipe containing a forming agent with an axial hole in the front and rear walls, support rollers and means for supplying an expandable composition, the rear wall is movable and provided with a centering element for the pipe.

 Further, the centering elements are made in the form of a washer fixed from the outside of the rear wall of the washer with an arm passing through an axial hole in the rear wall, which interacts with a removable level lock mounted in the pipe.

 Further, the level lock is made in the form of spring-loaded spacer shoes and a two shoulders lever, one shoulder of which interacts contactingly with the bracket, and a support element is fixed at the end of the other shoulder.

The accompanying drawings show:
in FIG. 1 - the device according to the invention in operation, the initial stage; figure 2 is a section along aa in figure 1; figure 3 is a device, rear view; in FIG. 4 - node alignment of pipes, the stage before interacting with the bracket, a longitudinal section; in FIG. 5 - the same stage of interaction with the bracket; in FIG. 6 - the same, the stage of release of the pipe from the rear wall, a longitudinal section; in FIG. 7 - a device according to the invention, the pipe is prepared for removal, General view.

 The device for applying a protective coating to the pipe includes a forming shell 1, which is removably fixed at the ends in the front 2 and rear 3 walls with an axial hole "a" for receiving the pipe 4. Between the pipe 4 and the shell 1, an annular ring is defined between the walls 2 and 3 space "b", which upon filling with a foamable composition forms an annular heat-shielding shell 5.

 On the rear wall 3, a washer 6 is placed outside with an axial hole "b", the diameter of which is smaller than the diameter of the hole "a". The washer 6 is attached to the wall 3 by means of guides 7 passing through the ears 8 on the wall 3.

 The washer has a horizontal bracket 9 directed inwardly through the hole “a”, the height of which corresponds to the inner generatrix of the pipe 4.

 Walls 2 and 3 are placed on the frame 10, and the wall 3 is connected with a linear movement mechanism, for example, a screw pair of a worm shaft 11 - a screw sleeve 12.

 Before the start of the process, a casing 1 is fixed between walls 2 and 3, clamping it with a wall 3 by rotating the worm shaft 11. To facilitate the operation of placing the casing, support rollers 13 are provided. Then, the rollers 14 are brought to the fixed wall 2 by a pipe 4, in which the removable end is installed a level lock, which is a box 15, in which the spacer shoes 16 and the two-arm pivot arm are spring-loaded, the shoulder 17 of which is designed to interact with the bracket 9, and the shoulder 18 at the end has a support roller 19.

 When the pipe 4 is inserted into the hole "a" of the wall 2, the shoulder 18 is raised so that it does not interfere with the entry of the pipe. It is in the cavity "b" of the shell 1 under the action of its own weight falls to touch the inner generatrix of the shell and resting on the end of the pipe 4.

 The pipe 4 in the protective shell must have bare ends, therefore, as soon as it enters the cavity to the length of the bare section, a foaming composition is introduced through the nozzle 20, directing it to the pipe 4 moving in the cavity “b”.

 The lever 18 with the roller 19 provide a stable position of the pipe relative to the shell, and the supply of a liquid composition over the entire length of the pipe creates optimal conditions for its foaming.

 At some point, the shoulder 17 under the action of the bracket 9, which enters the cavity of the pipe 4, being its support, is deflected and the roller 19 with the shoulder 18 come out of interaction with the inner surface of the shell, passing into the hole "a". The end of the pipe 4 mounted on the bracket 9 extends into the hole “a”, resting against the washer 6 and deflecting it along the guides 7 to the length of its extension.

 In this position, the whole structure remains until the end of foaming and hardening of the composition.

 It is important to coordinate the beginning of the foaming regime with the end of the placement of the pipe 4 in the cavity of the shell 1 so as to prevent the foam end from covering the end of the pipe, which should be exposed.

 Upon hardening of the composition, the wall 3 is diverted to the right so that the finished product, moving along the rollers 13, can be freely removed from the device.

 To bring the device in readiness for insulation of the next pipe, install a new shell, clamping it in the walls, and the process continues as described above.

 The advantage of the invention lies in the fact that the shell, remaining outside the monolithic insulation, provides its protection, extends the life of the insulation structure is homogeneous, and the process itself is efficient, quite simple and reliable.

Claims (1)

 A device for applying a protective coating to a pipe containing a forming tool with an axial hole in the front and rear walls, support rollers and means for supplying a foaming composition, characterized in that it is provided with centering means made in the form of a washer fixed on the outside of the moving rear wall with a passing through an axial hole in the rear wall of the bracket interacting with a removable level lock in the form of spacer shoes and two shoulders spring-loaded in the pipe end of the lever, one shoulder of which is in contact with the bracket, and a support element is fixed at the end of the other shoulder.

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