Title:
DEVICE FOR APPLYING HEAT-INSULATING SUBSTANCES ONTO PIPES
United States Patent 3637451
Abstract:
A device disclosed for applying heat-insulating substances onto pipes, wherein a pipe being insulation-coated is progressively displaced inside a hollow auger enclosed in a cylindrical casing and designed to feed and consolidate the substance being applied onto the pipe. The device makes it possible to apply onto pipes coatings of insulating substances having a volume weight of 400 kg./sq.cm. and less, which is attained owing to the fact that on the side of the outlet end of the casting there is mounted a ring element progressively displaceable together with the pipe and serving to limit the extrusion of insulating substance from the casing, while at the outlet end of the casing there is mounted a device for winding a band of elastic material onto the surface of the insulation-coated pipe.
US Patent References:
Removable form for use in cement lining pipe
Fell et al. - October 1967 - 3345031
Stop-off for centrifugal casting molds
Eurich et al. - February 1936 - 2030105
Apparatus for coating pipes
Smith - July 1962 - 3041700
Pipe coating machine
Hamson - September 1963 - 3102319
Removable form for use in cement lining pipe
Fell et al. - October 1967 - 3345031
Stop-off for centrifugal casting molds
Eurich et al. - February 1936 - 2030105
Apparatus for coating pipes
Smith - July 1962 - 3041700
Pipe coating machine
Hamson - September 1963 - 3102319
Inventors:
Gusev, Vladimir Alexeevich (Kiev, SU)
Rudenko, Nikolai Nikolaevich (Kiev, SU)
Rudenko, Nikolai Nikolaevich (Kiev, SU)
Application Number:
04/850028
Publication Date:
01/25/1972
Filing Date:
08/14/1969
View Patent Images:
Export Citation:
Primary Class:
Other Classes:
249/204, 156/547, 156/244.120, 425/113, 156/244.130
International Classes:
B28B19/00; B22D7/10; B29B5/04
Field of Search:
156/187,195,244,390,392,429,450,547,500 25/38 249/204
Primary Examiner:
Feinberg, Samuel
Assistant Examiner:
Hanley, James M.
Claims:
We claim
1. A device for applying heat-insulating substances onto pipes, said device comprising; a hollow cylindrical casing adapted for receiving insulating substance and provided with an outlet for the insulating substance; a hollow auger enclosed in said casing for forcing the insulating substance from the outlet of the casing; means to advance a pipe longitudinally through said casing so that sealing material forced from the outlet of the casing will coat the advancing pipe; a ring element mounted at the outlet of said casing and attachable to said pipe so as to be progressively displaceable with the pipe and serve to limit the extrusion of insulating substance from the casing; and means mounted at said outlet of the casing for winding a band of elastic material onto the surface of the pipe freshly coated with the insulating substance.
2. A device according to claim 1, wherein said means for winding a band of elastic material onto the surface of the pipe freshly coated with insulating substance comprises a rotatably driven gear installed at the outlet of said casing and at least one spring-biased spool carrying said band and coupled to said gear to be rotated around said pipe as the latter longitudinally advances.
3. A device according to claim 1, comprising a cylindrical sleeve integrally secured to said casing to adjust a gap formed between the outer surface of the pipe being insulated and the inner surface of said casing, said gap regulating the thickness of the applied coating.
4. A device according to claim 1, wherein said means to advance the pipe through the casing comprises a pair of displaceable carriages on opposite sides of said casing, each carriage including a cantilever support for insertion into a respective end of the pipe and clamping means on said support for clamping such end of the pipe thereto, said supports being respectively passable through said casing as the pipe is advanced.
1. A device for applying heat-insulating substances onto pipes, said device comprising; a hollow cylindrical casing adapted for receiving insulating substance and provided with an outlet for the insulating substance; a hollow auger enclosed in said casing for forcing the insulating substance from the outlet of the casing; means to advance a pipe longitudinally through said casing so that sealing material forced from the outlet of the casing will coat the advancing pipe; a ring element mounted at the outlet of said casing and attachable to said pipe so as to be progressively displaceable with the pipe and serve to limit the extrusion of insulating substance from the casing; and means mounted at said outlet of the casing for winding a band of elastic material onto the surface of the pipe freshly coated with the insulating substance.
2. A device according to claim 1, wherein said means for winding a band of elastic material onto the surface of the pipe freshly coated with insulating substance comprises a rotatably driven gear installed at the outlet of said casing and at least one spring-biased spool carrying said band and coupled to said gear to be rotated around said pipe as the latter longitudinally advances.
3. A device according to claim 1, comprising a cylindrical sleeve integrally secured to said casing to adjust a gap formed between the outer surface of the pipe being insulated and the inner surface of said casing, said gap regulating the thickness of the applied coating.
4. A device according to claim 1, wherein said means to advance the pipe through the casing comprises a pair of displaceable carriages on opposite sides of said casing, each carriage including a cantilever support for insertion into a respective end of the pipe and clamping means on said support for clamping such end of the pipe thereto, said supports being respectively passable through said casing as the pipe is advanced.
Description:
The present invention relates to devices for applying onto pipe, mainly metal pipes, heat-insulating substances of lightweight concrete variety (perlite concrete, ceramsite concrete etc.).
Known in the prior art are devices for applying onto pipes coatings of heat-insulating substances of lightweight concrete variety, which comprise a hollow auger enclosed in a casing having a cone at the outlet end (cf. U.S.S.R. Pat. No. 18,238, class 80 a, 6, 1928, and U.S. Pat. No. 2,945,278, class 25-38, 1960).
The cone in such devices greatly consolidates the substance applied onto the pipe (up to volume weight of over 400 kg./sq.cm.), owing to which said substance can serve a protective, e.g., corrosion-preventing, coating, but can not perform the function of a heat-insulating coating.
It is an object of the present invention to eliminate the above-mentioned disadvantage of said known devices.
The invention contemplates the provision of a device to make it possible to apply onto pipes coatings of insulating substances featuring volume weight of 400 kg./sq.cm. and less.
In order to solve the above problem, in a device for applying heat-insulating substances onto pipes, in which a pipe being insulation-coated displaced inside a hollow auger, according to the invention, on the side of the outlet end of said casing there is mounted a ring element progressively displaceable together with said pipe and serving to limit the extrusion of insulating substance from the casing, while at the outlet end of the casing there is mounted means for winding a tape of elastic material onto the surface of the pipe freshly coated with insulating substance.
Said arrangement for winding a tape of elastic material onto the surface of a pipe freshly coated with insulating substance can be provided with a driven gear installed at the outlet end of the casing and connected with at least one spring-biased spool carrying the winding tape.
In order to adjust the gap between the outer surface of the pipe being insulated and the inner surface of the casing, the latter gap serving to regulate the thickness of the applied coating, provision can be made for a cylindrical sleeve secured to the internal walls of the casing.
For a better understanding of the essence of the present invention, reference will next be made to an embodiment thereof with regard to the appended drawings, in which:
FIG. 1 is a plan view diagrammatically illustrating an installation for applying heat-insulating substances onto metal pipes, incorporating the device according to the invention;
FIG. 2 is a side view of the device according to the present invention, partially in longitudinal section;
FIG. 3 is an end view thereof; and
FIG. 4 is a side view of a carriage for displacing a pipe in the process of applying a coating.
The installation for applying heat-insulating substances onto pipes comprises: a device 1 (FIG. 1) for applying the substance into a pipe, carriages 3 and 3' displaceable along guideways 2 and having means 4 for securing a pipe 5 in the working position and advancing the pipe through the means 1, and an arrangement means for winding insulating tape onto the surface of pipe freshly coated with the insulating substance.
The device 1 for applying heat-insulating substances onto a pipe comprises: a hollow auger 6 (FIG. 2) enclosed in a cylindrical casing 7, a ring element 8 disposed at the outlet end of the auger 6, a cylindrical sleeve 9 secured to the inner wall of the casing 7, a loading hopper 10 with driven feed rollers 11 (FIG. 3) and brushes 12 (FIG. 2) installed at the place of entry of the pipe 5 into the auger 6.
With the aid of the cylindrical sleeve 9, which is replaceable, there is effected an adjustment of the gap between the outer surface of the pipe and the inner surface of the casing, which gap servers to regulate the thickness of the coating applied. When so doing, the auger 6 can be likewise replaced to correspond to the internal diameter of the sleeve 9.
The means for winding a tape of elastic material onto the surface of pipe freshly coated with insulating substance comprises: a gear 13 with a drive 14, and a spring-biased spool 15 carrying the winding tape and rotatable together with the gear 13 about the pipe 5. Polyvinyl chloride film, thick paper, rubber-treated cloth etc., can be used as the elastic material of the tape.
The means 4 for keeping the pipe 5 mounted in the working position on the carriage 3 comprises a reversing-drive mechanism 16 (FIG. 4), a strut 18 telescoped with the aid of a worm gear 17 and a cantilever support 19 strut 8 which carries a clamp 20 for the pipe.
With a view to saving perlite concrete and improving the heat-insulating properties of the coating obtained, provision is made for void-forming means 22 circumferentially arranged on brackets 21 attached to the internal surface of the cylindrical sleeve 9 at the perimeter at the outlet end of said sleeve.
The installation described hereinabove operates in the following manner.
The carriages 3 and 3' are set in the initial operating position shown in solid lines in FIG. 1 wherein carriage 3' is arranged immediately adjacent the device 1 (FIG. 1) so that its cantilever support 19 (FIG. 4) is passed inside the hollow auger 6, and the carriage 3, turned 180° with respect to carriage 3' is displaced away from the device 1 by a distance approximately equal to the length of pipe.
The pipe 5 to be coated is laid by a crane onto the means 4 for keeping the pipe in the working position. For this purpose, the cantilever supports 19 are introduced into the pipe at its ends, and the pipe is clamped by means of clamps 20 (FIG. 4), thereby preventing the pipe from turning during the rotation of the auger.
Then, the pipe 5 is displaced in the direction indicated by arrow A (FIG. 1) until its front end comes out of the inner space of the auger 6 to a length sufficient for securing the ring element 8 thereonto.
The ring element 8 can likewise be installed on the cantilever support 19 of the carriage 3' said ring element serving as an end barrier for the insulating substance at the end of the pipe thereby acting to limit extrusion of the insulating substance from the casing 6.
The brushes 12 (FIG. 2) are actuated to clean the metal pipe of corrosion and impurities.
At the same time the, insulating substance, in particular perlite concrete, is charged into the hopper 10.
With the aid of counterrotating feed rollers 11, the perlite concrete is fed to the blades of the auger 6, whose rotation imparted by a drive 23 causes the extrusion of the insulating substance from the casing 7 followed by the application of said substance onto the pipe surface.
When so doing, the ring element 8 progressively displacing together with the pipe limits the extrusion of perlite concrete substance from the casing and, the pipe is uniformly coated with the substance.
Simultaneously with the coating of the pipe 5 with perlite concrete, polyvinyl chloride tape prefixed to the gear 13 is unwound from the spool 15.
This tape, in the course of the progressive displacement of the pipe, is wound spirally overlapping onto the surface of pipe freshly coated with perlite concrete, thus forming a continuous sheath which is tight-fitting on the surface of the coating obtained and protects said coating from deterioration and scaling off the pipe.
This process continues until the pipe is fully coated with a layer of perlite concrete onto which polyvinyl chloride tape has been wound.
The processed pipe is gripped by a lifting mechanism (not shown in the drawing) and released from the clamps 20 and the ring element 8. Then, the carriages 3 and 3' move in the opposite directions, and the pipe is removed from the installation.
The carriages 3 and 3' return into the initial position, and the cycle repeats itself.
Known in the prior art are devices for applying onto pipes coatings of heat-insulating substances of lightweight concrete variety, which comprise a hollow auger enclosed in a casing having a cone at the outlet end (cf. U.S.S.R. Pat. No. 18,238, class 80 a, 6, 1928, and U.S. Pat. No. 2,945,278, class 25-38, 1960).
The cone in such devices greatly consolidates the substance applied onto the pipe (up to volume weight of over 400 kg./sq.cm.), owing to which said substance can serve a protective, e.g., corrosion-preventing, coating, but can not perform the function of a heat-insulating coating.
It is an object of the present invention to eliminate the above-mentioned disadvantage of said known devices.
The invention contemplates the provision of a device to make it possible to apply onto pipes coatings of insulating substances featuring volume weight of 400 kg./sq.cm. and less.
In order to solve the above problem, in a device for applying heat-insulating substances onto pipes, in which a pipe being insulation-coated displaced inside a hollow auger, according to the invention, on the side of the outlet end of said casing there is mounted a ring element progressively displaceable together with said pipe and serving to limit the extrusion of insulating substance from the casing, while at the outlet end of the casing there is mounted means for winding a tape of elastic material onto the surface of the pipe freshly coated with insulating substance.
Said arrangement for winding a tape of elastic material onto the surface of a pipe freshly coated with insulating substance can be provided with a driven gear installed at the outlet end of the casing and connected with at least one spring-biased spool carrying the winding tape.
In order to adjust the gap between the outer surface of the pipe being insulated and the inner surface of the casing, the latter gap serving to regulate the thickness of the applied coating, provision can be made for a cylindrical sleeve secured to the internal walls of the casing.
For a better understanding of the essence of the present invention, reference will next be made to an embodiment thereof with regard to the appended drawings, in which:
FIG. 1 is a plan view diagrammatically illustrating an installation for applying heat-insulating substances onto metal pipes, incorporating the device according to the invention;
FIG. 2 is a side view of the device according to the present invention, partially in longitudinal section;
FIG. 3 is an end view thereof; and
FIG. 4 is a side view of a carriage for displacing a pipe in the process of applying a coating.
The installation for applying heat-insulating substances onto pipes comprises: a device 1 (FIG. 1) for applying the substance into a pipe, carriages 3 and 3' displaceable along guideways 2 and having means 4 for securing a pipe 5 in the working position and advancing the pipe through the means 1, and an arrangement means for winding insulating tape onto the surface of pipe freshly coated with the insulating substance.
The device 1 for applying heat-insulating substances onto a pipe comprises: a hollow auger 6 (FIG. 2) enclosed in a cylindrical casing 7, a ring element 8 disposed at the outlet end of the auger 6, a cylindrical sleeve 9 secured to the inner wall of the casing 7, a loading hopper 10 with driven feed rollers 11 (FIG. 3) and brushes 12 (FIG. 2) installed at the place of entry of the pipe 5 into the auger 6.
With the aid of the cylindrical sleeve 9, which is replaceable, there is effected an adjustment of the gap between the outer surface of the pipe and the inner surface of the casing, which gap servers to regulate the thickness of the coating applied. When so doing, the auger 6 can be likewise replaced to correspond to the internal diameter of the sleeve 9.
The means for winding a tape of elastic material onto the surface of pipe freshly coated with insulating substance comprises: a gear 13 with a drive 14, and a spring-biased spool 15 carrying the winding tape and rotatable together with the gear 13 about the pipe 5. Polyvinyl chloride film, thick paper, rubber-treated cloth etc., can be used as the elastic material of the tape.
The means 4 for keeping the pipe 5 mounted in the working position on the carriage 3 comprises a reversing-drive mechanism 16 (FIG. 4), a strut 18 telescoped with the aid of a worm gear 17 and a cantilever support 19 strut 8 which carries a clamp 20 for the pipe.
With a view to saving perlite concrete and improving the heat-insulating properties of the coating obtained, provision is made for void-forming means 22 circumferentially arranged on brackets 21 attached to the internal surface of the cylindrical sleeve 9 at the perimeter at the outlet end of said sleeve.
The installation described hereinabove operates in the following manner.
The carriages 3 and 3' are set in the initial operating position shown in solid lines in FIG. 1 wherein carriage 3' is arranged immediately adjacent the device 1 (FIG. 1) so that its cantilever support 19 (FIG. 4) is passed inside the hollow auger 6, and the carriage 3, turned 180° with respect to carriage 3' is displaced away from the device 1 by a distance approximately equal to the length of pipe.
The pipe 5 to be coated is laid by a crane onto the means 4 for keeping the pipe in the working position. For this purpose, the cantilever supports 19 are introduced into the pipe at its ends, and the pipe is clamped by means of clamps 20 (FIG. 4), thereby preventing the pipe from turning during the rotation of the auger.
Then, the pipe 5 is displaced in the direction indicated by arrow A (FIG. 1) until its front end comes out of the inner space of the auger 6 to a length sufficient for securing the ring element 8 thereonto.
The ring element 8 can likewise be installed on the cantilever support 19 of the carriage 3' said ring element serving as an end barrier for the insulating substance at the end of the pipe thereby acting to limit extrusion of the insulating substance from the casing 6.
The brushes 12 (FIG. 2) are actuated to clean the metal pipe of corrosion and impurities.
At the same time the, insulating substance, in particular perlite concrete, is charged into the hopper 10.
With the aid of counterrotating feed rollers 11, the perlite concrete is fed to the blades of the auger 6, whose rotation imparted by a drive 23 causes the extrusion of the insulating substance from the casing 7 followed by the application of said substance onto the pipe surface.
When so doing, the ring element 8 progressively displacing together with the pipe limits the extrusion of perlite concrete substance from the casing and, the pipe is uniformly coated with the substance.
Simultaneously with the coating of the pipe 5 with perlite concrete, polyvinyl chloride tape prefixed to the gear 13 is unwound from the spool 15.
This tape, in the course of the progressive displacement of the pipe, is wound spirally overlapping onto the surface of pipe freshly coated with perlite concrete, thus forming a continuous sheath which is tight-fitting on the surface of the coating obtained and protects said coating from deterioration and scaling off the pipe.
This process continues until the pipe is fully coated with a layer of perlite concrete onto which polyvinyl chloride tape has been wound.
The processed pipe is gripped by a lifting mechanism (not shown in the drawing) and released from the clamps 20 and the ring element 8. Then, the carriages 3 and 3' move in the opposite directions, and the pipe is removed from the installation.
The carriages 3 and 3' return into the initial position, and the cycle repeats itself.