JP2007307511A - Bent pipe coating method and bent pipe coating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably support a metal bent pipe at its pipe end to complete coating after heating in a short time. <P>SOLUTION: A manually locking metal fitting 22 is mounted on the pipe end 12 on the recessed side of a pipe body 10 to be executed, a receiving metal fitting 23 is mounted on the pipe end 13 on the protruded side of the pipe body 10 to be executed, is heated along with the mounting metal fittings 10 in heating equipment 32 and the pipe body 10 to be executed is suspended at the place of the manually locking metal fitting 22 to be transferred to coating equipment 33 in a vertically suspended posture. In this bent pipe coating device 40, the pipe end 13 on the protruded side of the pipe body 10 to be executed is supported at the upper end part 52 of a support 50 by a support part 54 at the place of the receiving metal fitting 23 to hold a suspended state posture, an electrostatic powder coating gun 62 is moved along the pipe body 10 to be executed by travelling a traveller 44 to a guide track 43 having a curved shape simulating the pipe body 10 to be executed, so that spray coating is made. Thereafter, the pipe body 10 to be executed is suspended at the place of the manually locking metal fitting 22 to discharged to radiation equipment 34 or the like. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a curved pipe coating method and a curved pipe coating method in which a metal pipe having a curved pipe portion is used as a work tube, and a resin coating is applied to the outer peripheral surface by a fusion method using powder resin as a raw material. It relates to the equipment.

  For example, in the case of pipes installed in corrosive environments such as pipes laid on the ground, pipes buried in the ground, pipes submerged in the sea floor, etc., carbon steel pipes and stainless steel pipes used therefor , Since metal pipes such as cast iron pipes also require corrosion protection on the outer surface, they are usually coated with polyethylene or epoxy resin.

  In the case of straight pipes, in polyethylene, the extrusion coating method (that is, the pipe body is heated while the pipe body is running, the polyethylene film is extruded from the extruder, and is coated with a heated melted film body (very high viscosity) and cooled and solidified. High-efficiency continuous coating construction is performed by the above method. In epoxy resin, the electrostatic powder coating booth passing method (that is, while the tube is running, the tube is heated and passed through the coating booth provided with multiple electrostatic powder coating guns. A high-efficiency continuous coating operation is performed by a method of performing a fusion film-forming operation and aging at a predetermined temperature for thermosetting.

On the other hand, in the case of a curved pipe, a fluidized dip coating method (that is, a method in which an entirely heated tube body is immersed in a fluidized tank in which a resin powder is floated by an ascending air current to be in a fluid state to form a fusion film). Although this method can be used for thermoplastic polyethylene, it cannot be used for a thermosetting epoxy resin in which thermal degradation of the powder coating is likely to proceed. Efficiency is not very good.
In addition, the manual blown electrostatic powder coating method (that is, the method in which manual blown coating is applied sequentially to the entire heated tube) can be used for both polyethylene and epoxy resin, but the tube is blown from the beginning to the end of blowing. Since body temperature changes, a great deal of effort is required for film thickness distribution management and thermosetting quality control, resulting in low efficiency and high cost.

  Therefore, when the pipe body to be constructed is a metal pipe capable of induction heating even if it has a curved pipe part, an induction heating method is adopted as the heating means so that the coating can be formed with high quality and efficiency. A curved pipe coating apparatus has been developed (see, for example, Patent Document 2). This device is a group of support bases arranged in a stepping stone for horizontally placing the pipe to be constructed, and heating to the powder fusing temperature and projecting resin powder to the pipe to be constructed. An annular induction heating device, a group of coating guns arranged in an annular shape, and an annular cooling jacket are arranged in a through housing for applying application and cooling after film formation in sequence, and a powder recovery mechanism is provided in the housing. The paint booth provided and a moving mechanism for moving the paint booth along the pipe to be constructed are provided.

Moreover, a mechanism for retracting in synchronism with the movement of the painting booth is provided in each of the support bases. This eliminates the inconvenience that the coating booth and the support member interfere when the annular coating booth is moved along the construction pipe, so that the metal tube having the curved pipe portion is placed horizontally. Then, a resin coating can be applied to the outer surface by a powder fusion method using a moving heating method. Moreover, the resin powder applied to the outer peripheral surface of the tube does not adhere to the support member, and is not undesirably deformed by the support member before the fused resin coating is hardened.
In addition, the curved pipe coating device that has been put to practical use has a coating gun swung in the circumferential direction in order to eliminate coating unevenness, and excess resin powder that has not adhered is sucked out from the coating booth with a dust collector and collected. It is supposed to do.

Japanese Patent Publication No.59-30470 JP-A-2005-66422

  However, in such a conventional curved pipe coating apparatus, since re-supporting of the outer peripheral surface of the curved pipe portion after the formation of the induction heating and the resin coating is performed by the moving method, the pipe body and the resin are not suitable for it. The use of the device does not come true. That is, based on the required specifications, if the pipe to be constructed cannot be induction-heated or the applied resin cannot be cooled in a short time until re-supporting, the above-mentioned curved pipe coating device is used for coating. The formation cannot be performed efficiently with high quality. As a specific example, when the resin powder applied to the outer peripheral surface of the tube is, for example, polyethylene, since it is not allowed to pour water in the fused state, water cooling cannot be performed. It cannot be re-supported after rapid cooling.

In that case, the entire pipe to be constructed is heated and then the pipe is supported only at both ends where the resin coating is unnecessary, and the coating operation and slow cooling are performed. Whether it is hand-blown or using any machine, the coating operation must be completed within a short period of time, for example 4 minutes, when the change in the tube temperature is within an allowable range of 210 ° C. to 250 ° C. Moreover, since it is desired to avoid overheating of the tube, it must be processed in a short time, including the time for transferring the tube from a heating place such as a heating furnace to the coating work site. And for speeding up the coating operation, it is preferable to arrange the coating gun in an annular shape and move it along the pipe to be constructed. However, if the pipe is supported only at both ends, the entire pipe It is difficult to quickly stabilize and stabilize
Therefore, the first technical problem is to devise a curved pipe coating method that can support the pipe body relatively stably only at the pipe end and can finish the coating after heating in a short time.

Also, it is convenient to hang the pipes to be constructed from the heating place to the coating work place or from the coating work place to the cooling place with an existing crane or the like at the factory. If the posture and the posture at the time of coating are different, it takes time to change the posture, so it is more convenient if the posture is not changed.
Therefore, it is the second realization of a curved pipe coating device that accepts, coats and disposes a pipe to be constructed in a suspended state where the pipe end is raised and the central part of the pipe is lowered only by supporting both ends of the curved pipe. It becomes a technical problem.

Furthermore, if the resin powder leaks during coating, it will adhere to the outer surface of the coating booth, and if there is a movable member for swinging the coating gun, its function will be impaired. It has been conventionally performed to suck out excess resin powder from a coating booth with a dust collector, but the electrostatic coating method is not sufficient because it is strongly applied to an undesired portion by electrostatic force.
Therefore, a third technical problem is to realize a curved pipe coating apparatus that performs electrostatic coating without inconvenience such as undesired coating on movable members other than the outer peripheral surface of the pipe body to be constructed.

Also, the size and shape of the pipes to be constructed are not constant, and it is required to apply a resin coating to various types of curved pipes. It is desirable to be able to adapt to various curved pipes such as devices.
Therefore, the fourth technical problem is to realize a curved pipe coating device that can easily change the tube support position, and to realize a curved pipe coating device that can easily change the painting booth movement path. This is the fifth technical issue.

  The curved pipe coating method of the present invention (Claim 1) was devised to solve the first technical problem described above, and includes a heating facility, a curved pipe coating device, and a suspended transfer facility. A curved pipe coating method for applying a resin coating to the outer peripheral surface of a metal bent pipe, which is a construction pipe body, using a hanging handhold bracket and a support bracket for both ends of the construction pipe body. The heated pipe is heated together with the fittings by the heating equipment, and the hooks at both ends are hung and transferred to the curved pipe coating device by the suspension transfer equipment. Mounted on the curved pipe coating device in a suspended manner supported at the receiving metal fitting, then moved the coating machine working part along the mounted work tube and painted, then again the clasp metal fittings at both ends It is suspended from the bent pipe coating device by the hanging transfer equipment. To.

  Moreover, the curved pipe coating apparatus (Claim 2) of the present invention was contrived to contribute to the solution of the first technical problem described above and to solve the second technical problem described above. A curved pipe coating apparatus for applying a resin coating to the outer peripheral surface of a heated metal bent pipe having a clasp metal fitting and a receiving metal fitting attached to the outer peripheral surface of the pipe. A pair of supports for supporting the support portion are arranged opposite to each other, and a support member is provided at the upper end portion of each of the supports so as to be in contact with the receiving metal fitting when the end of the pipe body to be installed is placed. And a pair of curved guide rails imitating the construction pipe are arranged at positions that are arranged at regular intervals on both sides of the construction pipe supported by the support body. Dividable annular housing capable of loose insertion of work pipes supported by the body A coating machine operating portion mounted at a position where a plurality of coating guns surround the tube insertion point is attached to a traveling body suspended so as to be able to travel with respect to the guide rail. And

  Furthermore, the curved pipe coating apparatus (claim 3) of the present invention was contrived to contribute to the solution of the first technical problem described above and to solve the second and third technical problems described above. The curved pipe coating apparatus according to claim 2, wherein the coating gun is an electrostatic powder coating gun, and the coating gun is moved by reciprocating rotation in a circumferential direction. A contact ring rolling mechanism that swings with respect to the work pipe supported by the support is provided at a joint portion of the housing with the traveling body, and an intake pipe extending from the dust collector is connected to the housing. The housing is made of an electrical insulating material.

  Moreover, the curved pipe coating apparatus (Claim 4) of the present invention contributes to the solution of the first technical problem described above and solves the second technical problem described above, and then solves the third technical problem described above. 4. The curved pipe coating device according to claim 3, wherein the curved ring coating device is further designed to solve the problem at a high level, and further, the contact ring rolling mechanism rolls in contact with the inner and outer circumferences of the housing. Among the rolling wheels, at least those that roll in contact with the inner periphery of the housing are provided with air supply means for blowing air toward them.

  Moreover, the curved pipe coating apparatus (Claim 5) of the present invention was contrived to contribute to the solution of the first technical problem described above and to solve the second to fourth technical problems described above. 5. The curved pipe coating apparatus according to claim 4, further comprising a support distance capable of adjusting a distance between the supports by moving either one or both of the supports arranged opposite to each other. An adjustment mechanism is provided.

  Moreover, the curved pipe coating apparatus (Claim 6) of the present invention was contrived to contribute to the solution of the first technical problem described above and to solve the second to fifth technical problems described above. 6. The curved pipe coating apparatus according to claim 5, wherein the guide rail holding mechanism is detachable, and the chain extends over a circular path including a partial path along the guide rail. Towing long bodies such as ropes and ropes are stretched, both ends of the towing long body are attached to the traveling body, and traveling driving means for sequentially feeding the towing long body and the circulation path Path length adjusting means for locally expanding and contracting is provided.

  Moreover, the curved pipe coating apparatus (Claim 7) of the present invention was contrived to contribute to the solution of the first technical problem described above and to solve the second and fourth technical problems described above. Further, in the curved pipe coating apparatus according to claim 2 or 3, the distance between the supports is further increased by moving either one or both of the supports arranged opposite to each other. A support distance adjusting mechanism that can be adjusted is provided.

  In such a curved pipe coating method according to the present invention (Claim 1), when coating is performed on the outer peripheral surface of the metal pipe having the curved pipe portion, first, each of the both ends of the pipe body to be constructed has a clue. Attach not only metal fittings but also metal fittings. Then, the heat treatment, the hanging movement, the coating process, and the hanging movement are performed on the pipe body to be constructed with the fittings attached. In the meantime, in order to satisfy the required specification of coating on the outer peripheral surface other than both ends of the pipe to be constructed, nothing is attached and nothing is brought into contact with it except for the covering material such as resin powder. Moreover, the transfer between the facilities is quickly performed at the start and at the end by the latch using the clasp metal fitting. In addition, coating at the coating equipment is accelerated using a curved pipe coating device, and the tube posture during coating follows the suspension posture during transfer as a suspended manner by both-end support.・ Because it is maintained, painting starts and finishes quickly.

Also, when the curved pipe coating device accepts the pipe to be constructed, the pipe to be constructed is changed from the suspended state at both ends to the supported state at both ends. There is no risk of slipping or dropping off, and the construction pipe body is stabilized and stopped relatively quickly.
In this way, the pipe body can be stably supported in such a way that only the pipe end is supported by performing heating, transfer and coating without changing the posture of the suspension state while attaching the clasp metal fitting and the receiving metal fitting to the pipe end. Can be supported.
Therefore, according to this invention, the curved pipe coating method which can complete the coating after heating in a short time can be realized, and the first technical problem is solved.

  Moreover, in the curved pipe coating apparatus (Claim 2) of this invention, a to-be-processed pipe body is received in the state which divided | segmented the annular housing and released the upper half. Then, the pipe to be constructed is hung only at both ends using a clasp, and the pipe to be constructed is transferred in a suspended state in which the pipe end is raised and the center of the pipe is lowered, so that the pipe end is placed on the support member. At the position, the work tube is lowered. Then, the construction pipe body is supported at both ends while maintaining its suspended state posture, is subjected to axial movement, is regulated by interference between the metal fitting and the support member, and is quickly stabilized. In addition, in order to quickly attenuate the swing-like swing that shakes the pipe recess, the contact between the pipe body to be installed and the support member is dispersed contact in the circumferential direction of the pipe body, for example, arc contact or multi-point contact. If braking is used, it can be realized simply and inexpensively.

Then, if the coating gun is operated while running with the housing in an annular shape, resin powder is applied to the outer peripheral surface of the construction pipe while moving along the construction pipe, so that the construction pipe is bent. Even if it has a pipe part, coating is performed promptly.
When the coating is completed, the annular housing is divided again to release the upper half, and in this state, the pipe to be constructed is lifted only at both ends by using a clasp. As a result, the pipes to be constructed can be delivered quickly without supporting the both ends and changing the attitude of the pipes to be constructed.
Therefore, according to the present invention, it is possible to realize a curved pipe coating apparatus capable of receiving, coating, and discharging a pipe to be constructed in a suspended state in which the pipe end is raised and the central part of the pipe is lowered by supporting only both ends. And the second technical problem is solved.

Further, in the curved pipe coating apparatus according to the present invention (Claim 3), since the annular housing for holding the electrostatic powder coating gun so as to be swingable is made of an electrical insulator, the resin powder can be used. Since the electrostatic attractive force attracting the inner and outer surfaces of the housing hardly occurs, excess resin powder is efficiently sucked out of the housing by the dust collector. Therefore, even if the contact ring rolling mechanism is adjacent to the housing, the resin powder hardly adheres to the contact ring rolling mechanism. Even if the gap between the pipe body to be installed and the annular housing is widened, if there is some, the resin powder that leaks from the gap is hardly or little.
Therefore, according to the present invention, it is possible to realize a curved pipe coating apparatus in which electrostatic coating is performed without inconvenience such as undesired coating on movable members other than the outer peripheral surface of the pipe body to be constructed. Three technical problems are solved.

Further, in the curved pipe coating apparatus according to the present invention (Claim 4), air is applied to the rolling wheel on the inner peripheral side of the housing where the resin powder easily reaches among the movable members in the contact ring rolling mechanism. Since it is sprayed, even if some resin powder leaks out of the housing, there is no possibility that it will adhere to the rolling wheel and impair the function of the contact ring rolling mechanism.
Therefore, according to the present invention, a curved pipe coating apparatus is realized in which electrostatic coating is performed without any inconvenience such as undesired coating on a rolling wheel that is a movable member other than the outer peripheral surface of the pipe body to be constructed. The third technical problem can be solved at a high level.

Moreover, in the curved pipe coating apparatus of the present invention (Claim 5), by operating the support distance adjusting mechanism, the pipe support position can be easily adjusted to fit the length of the pipe to be constructed. Can be changed.
Therefore, according to this invention, the curved pipe coating apparatus which can change a pipe body support position simply can be implement | achieved, and a 4th technical subject is solved.

Further, in the curved pipe coating method and the curved pipe coating apparatus according to the present invention (Claim 6), by changing the guide rail, the coating gun moving path is adapted to match the bending of the pipe to be constructed. Can be changed. Accordingly, when the path of the long tow body changes and the path length expands and contracts, the path length adjusting means expands and contracts the circuit path of the tow long body to the offset side. Undesirable changes in length can be resolved easily and quickly, and the traveling body and thus the coating gun can be moved without any inconvenience.
Therefore, according to the present invention, it is possible to realize a curved pipe coating apparatus capable of easily changing not only the tube support position but also the coating gun moving path, and the fifth technical problem is solved.

  With respect to one embodiment (first embodiment) of the present invention, first, a curved pipe coating method will be described with reference to the drawings. 1A and 1B show the procedure, in which FIG. 1A is a perspective view of a pipe 10 to be constructed, FIG. 1B is a perspective view of a clasp metal fitting 22 and a receiving metal fitting 23, and FIG. (D) is an external view of the hook for hooking in the suspended transfer equipment 31, (e) is a schematic view corresponding to a perspective view relating to a booth of the heating equipment 32, f) is a schematic view corresponding to a perspective view of a booth of the coating equipment 33, and (g) is a perspective view of a frame of the heat radiation equipment 34. FIG.

  This curved pipe coating method is a coating method for applying a resin coating to a peripheral surface of a steel pipe or other metal pipe body 10 as a work pipe body 10 by a powder fusion method. Even if the curved pipe part 11 is included in the tubular body 10, it can be constructed without any inconvenience. The pipe body 10 with the bent pipe portion (see FIG. 1 (a)) may be a curved pipe as a whole, but the central portion is an arc-shaped bent pipe portion 11 and the remaining both end portions are Many are straight pipes. Since the bent pipe portion 11 is assumed to be a single tube, the pipe 10 to be constructed has a concave side and a convex side, and the pipe end 12 and the convex side are convex on both ends of the pipe 10 to be constructed. A side tube end 13 is present. Typical examples of the pipe 10 to be constructed include a diameter of 150 mm to 1000 mm, a thickness of 10 mm to 50 mm, a length of 2000 mm to 5000 mm, a bending angle of 10 ° to 90 °, a weight of 0.1 t to 3 t, and a material of carbon steel or Cr steel. , But not limited to stainless steel.

  Moreover, in this curved pipe coating method, the clasp metal fitting 22 and the receiving metal fitting 23 (see FIGS. 1B and 1C), the suspended transfer equipment 31 (see FIG. 1D), and the heating equipment 32 (Refer FIG.1 (e)), the coating equipment 33 (refer FIG.1 (f)), and the thermal radiation equipment 34 (refer FIG.1 (g)) are used. The clasp metal fitting 22 and the receiving metal fitting 23 (see FIGS. 1B and 1C) are made of, for example, cast iron or stainless steel, and a main body formed in a “U” shape and one through female screw of the opposing piece. It is attached to the pipe end with the pipe end clamped by inserting the pipe end into the main body and screwing in the small bolt so that it can be removed from the pipe end by loosening the small bolt. It has become. Further, the clasp metal fitting 22 is provided with a latching portion 21 such as a hanging ring. The hook portion 21 is for hooking a crane of the suspended transfer equipment 31 and comes out of the pipe when the clasp metal fitting 22 is attached to the pipe end.

  The suspended transfer equipment 31 (see FIG. 1 (d)) may be used, for example, if a crane is installed in advance in the painting factory. If a mobile crane is available, it can be used in the painting factory. In short, in short, it is only necessary to have a pair of hooks that are hung on both ends of the pipe body 10 to be constructed so that they can be moved up and down or moved horizontally. The hooking portion of the hanging metal fitting 22 is generally a hook-like hook when the hooking portion 21 of the hook metal fitting 22 is a ring as shown in the figure, but the hook portion 21 of the hook metal fitting 22 is used as a hook. In this case, the hanging portion of the suspended transfer equipment 31 may not be a hook, and may be, for example, a ring shape, a cast iron rigid ring, or a steel wire flexible ring.

  As the heating equipment 32 (see FIG. 1 (e)), a heating furnace installed in a heat shield booth with an open ceiling is easy to use, but a loading / unloading port and a transport mechanism may be provided instead of opening the ceiling. . The heating furnace should just raise the temperature of the to-be-processed pipe 10 near the upper limit of the allowable range of the resin coating formation temperature in the powder fusion method. For example, it is sufficient that the temperature can be raised to the heating target temperature 260 ° C. that is slightly higher than the upper limit temperature 250 ° C. described in the problem column. There is no limitation on the heating method, gas heating or induction heating may be used, direct heating or indirect heating may be used, and single heating or moving heating may be used. As long as the tube 10 to be constructed can be heated uniformly over the entire length and there are no other inconveniences, a heating means having no furnace or booth may be used. The holding posture of the construction tube body 10 during heating may be horizontal, vertical, mounted, or supported.

  As the coating equipment 33 (see FIG. 1 (f)), it is easy to use the installation of the curved pipe coating device 40 in the dustproof booth with an open ceiling. In the curved pipe coating method, the work tube 10 is suspended by the suspension transfer equipment 31 and is carried into the curved pipe coating apparatus 40 in a suspended manner or carried out from the curved pipe coating apparatus 40. The ceiling should be openable. The curved pipe coating and covering device 40 will be described in detail later. In short, the both ends of the pipe body to be constructed 10 are supported at the metal fittings 23 so that the curved pipe portion 11 at the center is directed downward and the end of the concave side pipe ends. By holding the work tube 10 in a suspended state with the 12 facing upward, and moving the coating machine operating portion along the work tube 10 while maintaining the posture of the suspended state, the powder resin The coating is performed by the fusion method using as a raw material. The coating machine action part is a movable part that is used by being moved in the coating machine. For example, an electrostatic coating gun, a spray gun, a fluid immersion tank, and a non-fluid immersion tank are provided.

  As for the heat dissipating equipment 34 (see FIG. 1 (g)), it is also easy to use a stand installed in a windproof booth with an open ceiling, but if there is no risk of being exposed to winds that are too cold or troublesome to adhere to, There may be no booth wallboard. The pedestal need only be able to continue to support the construction pipe body 10 at both ends using the receiving bracket 23 and the clasp bracket 22, and if it is supported one by one, a pair of stepladders may be used. If this is the case, the two rows of rice paddles and rice racks shown in the figure are convenient and inexpensive.

In order to apply resin coating to the outer peripheral surface of the pipe body 10 to be constructed (see FIG. 1A) using these facilities by the powder fusion method, as the first step, both ends of the pipe body 10 to be constructed A clasp metal fitting 22 is attached to the concave pipe end 12 and a receiving metal fitting 23 is attached to the convex pipe ends 13 at both ends of the pipe 10 to be constructed (see FIG. 1C).
In the second step, the hook of the suspension transfer facility 31 is hung on the latching portion 21 of the handle fitting 22, thereby temporarily engaging the handle fitting 22 and the pipe end of the pipe body 10 to be suspended to the suspension transfer facility 31. Then, the work tube 10 is lifted by the suspension transfer equipment 31 and moved onto the heating equipment 32 and lowered into the heating equipment 32, and the suspension transfer equipment 31 is removed from the work pipe 10.

In a 3rd process, the to-be-processed pipe body 10 is heated with the heating equipment 32, and it heats up to just above the upper limit of the allowable range of the resin coating formation temperature in a powder fusion system.
In the fourth step, the hook of the suspension transfer facility 31 is again hooked on the latching portion 21 of the handle bracket 22, thereby temporarily engaging the handle bracket 22 and the pipe end of the pipe 10 to be suspended with the suspension transfer facility 31. Let Then, the work tube 10 is lifted by the suspending transfer equipment 31, moved out of the heating equipment 32 in a suspended manner, moved onto the coating equipment 33, and lowered into the coating equipment 33 to be suspended. The bent pipe coating device 40 is supported in the above posture, and the suspended transfer equipment 31 is removed from the construction pipe body 10.

  In the fifth step, the bent pipe coating device 40 is supported at the metal fittings 23 by receiving both ends of the pipe 10 to be constructed, thereby quickly stabilizing the posture of the hanging form of the pipe 10 to be constructed. And spray coating is performed by spraying resin powder on the hot outer peripheral surface of the to-be-processed pipe body 10, moving a coating gun along the to-be-processed pipe body 10 with the support state continuing. This spraying starts from one end of the tube 10 to be processed when the temperature of the tube 10 to be processed falls below the upper limit of the resin coating formation temperature in the powder fusion method, and the coating gun is applied at a constant speed. It is moved to near the other end of the pipe 10 to be constructed, but the process is completed while the temperature of the pipe 10 to be constructed exceeds the lower limit of the allowable range of the resin coating formation temperature in the powder fusion method.

In the sixth step, again, the hook 21 of the suspension transfer facility 31 is hooked on the latching portion 21 of the handle bracket 22 so that the suspension bracket 22 and the pipe end of the pipe body 10 to be constructed are suspended. 31 is temporarily engaged. Then, the pipe 10 to be constructed is lifted by the suspension transfer equipment 31, taken out from the coating equipment 33 in the suspended state, moved onto the heat radiation equipment 34, and then lowered to be supported on the gantry. The suspended transfer equipment 31 is removed from the tube body 10.
In this way, the powder resin sprayed on the outer peripheral surface of the pipe body 10 to be processed by the curved pipe coating apparatus 40 is melted and processed since the pipe body 10 is heated to the resin coating forming temperature. As it adheres to the tube 10 and the tube 10 to be constructed is gradually cooled by the heat dissipating equipment 34, it slowly solidifies over time while being exposed to the atmosphere. Therefore, the residual shear stress at the bonding interface is minimized, and the resin is strongly fused to the outer peripheral surface of the pipe body 10 to be applied.

  As mentioned above, as the process after the work tube 10 has been paid out from the curved pipe coating device 40, the process of gradually cooling the work tube 10 with the heat dissipating equipment 34 has been exemplified. For example, it may be air blowing, forced cooling by water cooling of the inner surface of the pipe, or top coating using residual heat. This overcoating can also be carried out by a gun coating method, a fluid immersion method, a spraying method, or a non-fluid powder immersion method.

  Next, regarding one embodiment (first embodiment) of the present invention, the structure of a curved pipe coating apparatus 40 suitable for carrying out the above-described curved pipe coating method will be described with reference to the drawings.

1 (h) and 2 (a) are perspective views of the curved pipe coating device 40, and FIG. 2 (b) is a developed view thereof.
3A is a perspective view of the support member 54 of the support 50, FIG. 3B is a perspective view of the central portion of the upper end 52 of the support 50, and FIG. FIG. 6D is a perspective view of the pipe 10 in a pipe end supported state and a front view of a cross section near the pipe end of the support member 54; FIG. 5E is a pipe in a pipe end supported state; FIG. 10 is a side view of a longitudinal section in the vicinity of the pipe end of the support member 54 and the support member 54.

  4A and 4B are perspective views of the electrostatic powder coating gun 62 and the housing peripheral plate 63, FIG. 4C is a perspective view of the housing side plate 64, and FIG. 4D is a housing side plate 64 and the housing. The perspective view of the annular housing 60 in which the peripheral plate 63 and the housing side plate 66 are all developed, (e) is the perspective view of the annular housing 60 in which the housing side plate 64 is deployed, (f) is the perspective view of the annular housing 60, (g) ) Is a longitudinal side view of the annular housing 60. 5A is a longitudinal side view of the annular housing 60 and a side view corresponding to a developed view of the contact ring rolling mechanism 70, and FIG. 5B is related to the drive pinion 73 and the driven rack 72 of the contact ring rolling mechanism 70. (C) is a vertical side view of the rolling wheel 74 of the contact ring rolling mechanism 70, (d) and (e) are front views of the annular housing 60 and the traveling body 44, and (f) is the rolling wheel 74. It is a front view concerning the air pipe 75. FIG.

  The bent pipe coating device 40 (see FIGS. 1 (h) and 2) is a metal in which a clasp 22 is attached to each of the concave pipe ends 12, and a receiving metal 23 is attached to each of the convex pipe ends 13. A pipe body with a bent pipe portion is used as a construction pipe body 10, and the construction pipe body 10 is suspended with a curved pipe section 11 at the center facing downward and a concave pipe end 12 directed obliquely upward. A pair of support bodies 50 arranged opposite to each other so as to be lowered onto the curved pipe coating device 40 from above at the time of carry-in and lifted upward from above the curved pipe coating device 40 at the time of carry-out. The construction pipe body 10 is continuously supported by the support at the pipe end in the same hanging state as that of the suspended state.

The curved pipe coating apparatus 40 is for applying a resin coating to the outer peripheral surface of the work tube 10 by a powder fusion method, and spraying the resin powder in the longitudinal direction of the pipe body. In order to carry out the movement, a plurality of electrostatic powder coating guns 62 are mounted in positions around the tube free insertion point 61, and an annular housing 60 (coating machine operating portion) is mounted, and when powder resin is sprayed A guide rail 43 and a traveling body 44 for moving the electrostatic powder coating gun 62 along the work tube 10 are provided.
Furthermore (see FIG. 1 (h) and FIG. 2 (a)), an electrostatic coating machine that supplies a resin powder to the electrostatic powder coating gun 62 and applies a static voltage to the curved pipe coating device 40. A main body 41 (a main body portion fixedly installed in the coating machine) and a dust collector 42 that sucks air from the annular housing 60 are arranged side by side.
Hereinafter, each part of the curved pipe coating apparatus 40 will be described.

  The support body 50 (see FIGS. 1 (h) and 2) has a base 51 for securing the height of the pipe end support position, and an upper part of the base 51 with an inclination suitable for the inclination of the pipe end. An upper end 52 provided, a gripping member 53 (a guide rail holding mechanism) that can be easily attached to both ends of the upper end 52 with a bolt or the like, and a front end of a recess formed in the center of the upper end 52 A support member 54 that is easily attached and detached with a bolt or the like, and a traction wheel that is provided on each side surface of the base portion 51 or on both side surfaces of the upper end portion 52 and is rotationally driven by an electric motor in the base portion 51. It has a body 55. The base part 51, the upper end part 52 and the support member 54 are made of a low-priced steel frame material or plate material having excellent strength and rigidity in order to support the work tube 10 that may exceed 1t. .

  The guide rail 43 (refer to FIG. 1 (h) and FIG. 2) is made of, for example, a steel tube that is light and rigid in order to define the travel path of the travel body 44 and the annular housing 60. Since the outer diameter is adapted to the gripping member 53, the outer diameter is adapted to the gripping member 53, and if it is placed on the end of the upper end 52 and then sandwiched by the gripping member 53, it is fixed to the shoulder of the support 50. It has become. The length of the guide rail 43 is about twice that of the gripping member 53 or longer than that of the pipe body 10 to be constructed. From the center part of the guide rail 43 to both ends, at least the same length portion as the construction pipe body 10 is bent in advance, and has a bent shape substantially the same as the construction pipe body 10.

Aside from the difference between the diameter and the length of both ends, it is preferable that the guide rail 43 and the pipe body 10 to be bent are completely matched in the way of bending. If the difference between the two 43 and 10 is within the remaining amount obtained by subtracting the upper limit value of the swing of the construction pipe 10 from the play allowance of 10, the way of bending the guide rail 43 corresponds to the construction pipe 10. It can be said that the guide rail 43 imitates the construction pipe body 10 with respect to the curved shape.
Two such guide rails 43 are used, and are held and fixed to each of the shoulder portions of the upper end portion 52 of the support 50 one by one. Then, when the supporting member 54 of the support 50 facing the end of the pipe 10 to be constructed is supported, the two guide rails 43 are separated on both sides of the pipe 10 to be constructed, and any of the guide rails 43 is covered. It is arranged with the construction tube body 10 at a constant interval.

  The traveling body 44 (see FIGS. 1 (h) and 2) has an arcuate portion corresponding to the lower half of an annular body that is larger than the annular housing 60 in order to attach the annular housing 60. , And both end portions extending substantially horizontally from both ends to the outside. A slide bearing or the like is provided at the end portion, and the traveling body 44 is inserted and engaged with one guide rail 43 at one end portion and the other guide rail 43 at the other end portion. Is suspended from the guide rail 43 so as to be able to travel. One end of a long traction body 56 made of, for example, a chain is connected to the end of the traveling body 44. The long traction body 56 is wound or released from the other end side by a traction wheel body 55. For example, the traveling body 44 is caused to travel.

  Since the support member 54 (see FIG. 3A) is placed on the end of the pipe body 10 to be constructed, the end of the pipe member 10 is in arcuate contact with the receiving metal 23 to perform the pipe end support (see FIG. 3D). A support portion 54a is erected on the front edge (see FIG. 3A). The upper side of the pipe end support portion 54a has an arc shape corresponding to the curvature of the outer peripheral surface of the pipe body 10 to be constructed. Moreover, since the receiving metal fitting 23 is hooked on the pipe end support part 54a (see FIG. 3E), the pipe end support part 54a is firmly fixed by welding or the like. Further, (see FIG. 3A), the pipe end drop portions 54b are arranged side by side on the left and right sides of the pipe end support portion 54a so that the work tube 10 lowered by the suspended transfer equipment 31 is smoothly mounted on the pipe end support portion 54a. The distance between the pipe end drop portions 54b is slightly larger than the outer diameter of the pipe body 10 to be constructed. Such a support member 54 (see FIGS. 3B and 3C) is a bolt at the center of the upper end portion 52 of the support 50 with the tube end support portion 54a protruding toward the front, that is, toward the opposite support. The travel range / movement range of the annular housing 60 is expanded to the vicinity of the end of the pipe body 10 to be constructed.

  The annular housing 60 (see FIG. 4) is a so-called movable mini-painting booth that surrounds the tube loose insertion portion 61 slightly apart, and holds, for example, four electrostatic powder coating guns 62 arranged radially. In addition, a short cylindrical housing peripheral plate 63 that bears a radial enclosure, a disc-shaped housing side plate 64 that is arranged on one end side thereof and bears an axial enclosure, and is arranged on the other end side of the housing circumferential plate 63. And a disk-shaped housing side plate 66 that bears an axial enclosure. All (63, 64, 66) are made of an electrically insulating plate material such as bakelite, and the central tubular body insertion portion 61 is vacant, so that a U-shaped enclosure with an inner opening is formed in an annular shape. Has been. The electrostatic powder coating gun 62 has a paint spray port in its enclosure. Further, the inside of the enclosure is exhausted by the intake pipe 68. For this reason, the intake pipe 68 extends from the dust collector 42 and reaches, for example, the housing side plate 66, and a through-hole formed therein. It is connected in communication.

  These housing members 63, 64, and 66 are all slightly lower in the upper half so that the horizontally long pipe 10 can be lowered by the suspended transfer equipment 31 and stored in the pipe loose insertion place 61. The lower half is divided into two, and can be freely opened / closed and detached using appropriate hinges and hooks. Since the annular housing 60 is opened and closed on the upper side, the lower portion of the housing side plate 64 is fixed to the traveling body 44 by the mounting leg 65, and the lower portion of the housing side plate 66 is fixed to the traveling body 44 by the mounting leg 67. . The lower portion of the housing peripheral plate 63 is also attached to the traveling body 44. The housing peripheral plate 63 is interposed with a contact ring rolling mechanism 70 described below in order to swing the electrostatic powder coating gun 62 in the circumferential direction. It is attached to the traveling body 44 so that it can be reciprocally rotated (partially bidirectionally rotated) by, for example, about 90 ° in the circumferential direction.

  The contact ring rolling mechanism 70 (see FIG. 5A) includes a peripheral plate expansion member 71 attached to the outer peripheral surface of the housing peripheral plate 63 in order to expand the lower half of the housing peripheral plate 63 in the radial direction. A driven rack 72 that is bent in an arc shape and attached to the peripheral plate expansion member 71, and a drive pinion 73 that is provided at the upper end of a support bar that is erected on the traveling body 44 and is reciprocally rotated by an electric motor (not shown). Also, a pair of rolling wheels 74 provided between the upper end and the middle of the support rod standing on the traveling body 44 is provided. In the assembled state, the drive pinion 73 meshes with the driven rack 72 (see FIG. 5B), and one of the paired rolling wheels 74 can roll with the inner peripheral portion of the peripheral plate expansion member 71. The other rolling wheel 74 is brought into contact engagement with the outer peripheral portion of the peripheral plate expansion member 71 so as to be able to roll (see FIG. 5C).

A plurality of such pairs of rolling wheels 74 are arranged radially (see FIG. 5D), and support the housing peripheral plate 63 so as to be reciprocally rotatable. Then, when the drive pinion 73 reciprocates, the driven rack 72 is sent in the circumferential direction, and the circumferential plate expansion member 71, the housing circumferential plate 63, and the electrostatic powder coating gun 62 reciprocate in the circumferential direction. (See FIG. 5 (e)).
Of those rolling wheels 74 that roll in contact with the inner peripheral portion of the peripheral plate expansion member 71, an air supply pipe 75 is juxtaposed as an air supply means for blowing air toward it. The air supply pipe 75 is, for example, a pipe drawn from the existing compressed air supply equipment in the factory, and an appropriate throttle valve and nozzle are attached.

  About the curved pipe coating apparatus 40 of this embodiment (1st form), the use aspect and operation | movement are demonstrated referring drawings. FIG. 1 (h) is a perspective view of the curved pipe coating device 40 and the pipe 10 to be transferred. FIG. 2 (a) shows the curved pipe coating device 40 and the coating pipe being coated with it. 1 is a perspective view of a construction tube body 10.

  The construction target pipe body 10 heated by the heating equipment 32 is lifted by the suspension transfer equipment 31 using the latching portion 21, and is suspended with the curved pipe portion 11 facing down and the concave side pipe end 12 inclined upward. Since it is carried to the upper part of the curved pipe coating apparatus 40 with the attitude | position of an aspect (refer FIG.1 (h)). In the curved pipe coating apparatus 40, the upper side of the annular housing 60 is opened, and it waits for the construction object 10 to be lowered. When the work tube 10 is gently lowered so that it does not shake while maintaining the above posture, and the convex tube ends 13 at both ends thereof are supported by the support members 54 at the receiving brackets 23, the suspended transfer equipment 31 is latched. While removing from the part 21, the upper side of the annular housing 60 is closed and the annular housing 60 is returned to an annular shape (see FIG. 2A).

  Then, the towing elongate body 56 is towed by the towing wheel body 55 and the traveling body 44 and the annular housing 60 are quickly drawn to the one support body 50, and the temperature of the pipe body 10 to be constructed is a powder fusion method. Wait until the resin coating formation temperature falls below the upper limit of the allowable range. When the temperature falls within the allowable range, the electrostatic powder coating gun 62 is operated to start spraying the powder resin, and at the same time, the reciprocating rotation of the drive pinion 73 is also started. In addition, the towing elongate body 56 is towed by the towing wheel body 55, the traveling body 44 is pulled toward the other support body 50, and the annular housing 60 is fixed along the construction pipe body 10 by the restriction of the guide rail 43. Drive at speed. Until the annular housing 60 reaches the other support 50 and stops running, the powder resin spraying with the electrostatic powder coating gun 62 and the shaking of the electrostatic powder coating gun 62 by the contact ring rolling mechanism 70 are performed. The movement continues.

Thus, apart from the pipe end, the powder resin is sprayed almost uniformly over substantially the entire outer peripheral surface of the pipe body 10 to be constructed.
Although the above-described operation such as traveling is controlled automatically or semi-automatically, the traveling speed of the electrostatic powder coating gun 62 is determined by the resin coating formation when the temperature of the tube 10 to be applied is the powder fusion method. The speed is set so that the full length spraying is completed while the temperature is within the allowable range.
And after completion | finish of spraying, the upper side of the annular housing 60 is opened, and the to-be-constructed pipe body 10 is suspended while maintaining the posture of the suspended state in which the curved pipe portion 11 is downward and the concave side pipe end 12 is obliquely upward. It is carried out by the transfer facility 31.

  The configuration of another embodiment (second embodiment) of the curved pipe coating apparatus of the present invention will be described with reference to the drawings. FIGS. 6A and 6B are overall front views of the curved pipe coating apparatus 80, and show a state of application to the construction pipe body 10 having a different shape.

The curved pipe coating apparatus 80 is different from the above-described curved pipe coating apparatus 40 in that it is expanded so that the same apparatus can be applied to the pipe body 10 having a different shape. is there.
Specifically, a support distance adjustment rail 81 is laid across the support bodies 50 as a support distance adjustment mechanism that can move the support bodies 50 arranged opposite to each other and adjust the distance between the support bodies 50. A support distance adjustment caster 82 for traveling on the base portion 51 is attached to the lower end of the base portion 51. Further, the upper end portion 52 of the support body 50 can be swung so as to swing to the opposite side, and the upper end portion 52 is swung so that the support member 54 and the gripping member 53 are inclined. If it adapts to the edge part inclination of the tubular body 10 and the guide rail 43, the upper end part 52 will be fixed by bolting etc. As shown in FIG.

  Further, a long towing body 56 made of a chain or rope is stretched over the guide rail 43, one support body 50, the vicinity of the support distance adjusting rail 81, and the other support body 50, and the towing long body body. Both ends of 56 are attached to the traveling body 44 so that the towing elongate body 56 goes around the endless path. And the cyclic | annular housing 60 is guided to the guide rail 43 by moving the towing | longitudinal elongate body 56 sequentially in the circuit path | route, and moves along the to-be-constructed pipe body 10. FIG. Since only one traveling drive wheel 83 provided as traveling drive means for sequentially feeding the towing elongate body 56 and rotated by an electric motor is sufficient, it is provided only on one support 50.

  The traction wheel body 55 provided on both supports 50 is removed from the role of the travel drive means, and instead, the circulation path of the traction elongate body 56 is defined at the swing center position of the upper end 52. It is supposed to be. Further, as a route length adjusting means for locally expanding and contracting the circulating route of the towing elongate body 56 at the support body 50 and as a tension adjusting means for the towing elongate body 56, the circulating route of the towing elongate body 56 is changed. A path length adjusting wheel body 84 to be defined is mounted on the base portion 51, and the route length adjusting wheel body 84 is moved along a long hole formed in the base portion 51 and then fixed. The expansion and contraction of the portion along the guide rail 43 in the circulation path of the long elongate body 56 is offset to keep the entire length of the circulation path of the elongate long body 56 constant.

  About the curved pipe coating apparatus 80 of this embodiment (2nd form), the usage aspect and operation | movement are demonstrated referring drawings. FIG. 6 shows a state of coating by the above-described curved pipe coating apparatus 80, where (a) is painting the long and sharply bent pipe 10, (b) is short and bent. The loose construction pipe 10 is being painted.

First (see FIG. 6 (a)), when the work tube 10 is long, the distance between the supports 50 is widened on the support distance adjusting rail 81, and the guide rail 43 corresponding to the work tube 10 is annular. The travel path of the housing 60 is defined and the facing state of the support 50 is fixed. Further, the bending distance of the circulating route of the towing elongate body 56 by the route length adjusting wheel body 84 is shortened. Furthermore, when the pipe body 10 to be constructed is deeply bent, the inclination of the upper end portion 52 of the support body 50 is made abrupt.
In this way, the curved pipe coating apparatus 80 is adapted to the long and deep bent pipe 10 to be installed.

On the other hand (see FIG. 6B), when the pipe body 10 to be constructed is short, the distance between the support bodies 50 is narrowed on the support distance adjusting rail 81. In addition, the folding distance of the circular path of the towing elongate body 56 by the path length adjusting wheel body 84 is extended. Further, when the bent tube 10 is shallow, the inclination of the upper end portion 52 of the support 50 is moderated.
In this way, the curved pipe coating device 80 is adapted to the pipe 10 to be constructed having a short and shallow bend. The repeated description is omitted, but the bent tube coating apparatus 80 is also applicable to the long and shallow bent pipe 10 and the short and deep bent pipe 10. In addition, when the pipes 10 to be constructed have different thicknesses, it is only necessary to replace the support member 54 or only the pipe end support part 54a.

As the construction pipe body 10, the following metal pipe body with a curved pipe portion was selected. That is, the material is made of “API 5L steel pipe for line pipe”, diameter 406.4 mm, wall thickness 14.2 mm, total length 4190 mm, of which the curved pipe part length 3190 mm, straight pipe part length (per one end) 500 mm, bending angle 90 A coating was applied to the outer peripheral surface of a tube having a temperature of 576 kg.
Since epoxy is used as the powder resin, the lower limit of the resin coating formation temperature in the powder fusion method is 210 ° C., and the upper limit is 250 ° C.
In the heating facility 32, the construction target tube 10 was heated to 260 ° C by a gas circulation furnace.

  Although it took about 90 s to transfer the construction pipe 10 to the curved pipe coating device 80 of the coating equipment 33 by the suspended transfer equipment 31, the surface temperature of the construction pipe 10 was higher than 250 ° C. It was. The annular housing 60 was returned to the annular shape, brought close to one of the supports 50, waited for a while until the surface temperature of the tube 10 to be constructed dropped to 250 ° C., and then the annular housing 60 was run and sprayed. The traveling speed was 20 mm / s, and it took about 265 seconds until the end of spraying. However, the temperature of the tube 10 to be constructed was only lowered to 220 ° C. The circumferential swing speed of the electrostatic powder coating gun 62 was about 30 ° / s.

Thereafter, the pipe body 10 to be constructed was transferred from the coating equipment 33 to the heat radiating equipment 34 by the suspension transfer equipment 31 and radiated for about 2 hours.
As a result of confirming the resin coating of the pipe body 10 to be returned to the normal temperature, it was uniformly distributed over almost the entire outer peripheral surface of the pipe body 10 to be welded, and was firmly fused.
When the bent tube coating device 80 after use is inspected, the resin does not adhere to the rolling wheels 74 and the like, the annular housing 60 can be smoothly rotated in the circumferential direction, and the upper and lower states of the annular housing 60 are opened and closed. In addition, the traveling state of the traveling body 44 also remained smooth, and the state suitable for continuous use was maintained.

[Others]
In each of the above-described embodiments, the traveling body 44, the base 51, the upper end 52, the gripping member 53, and the like are illustrated as solid bodies or box-like bodies when the curved pipe coating apparatuses 40 and 80 are illustrated. However, if they have sufficient strength and rigidity, they may be constituted by a truss structure, a ramen structure, or a plate-like body, which makes it easier to reduce the weight and reduce the cost.
In the second embodiment, the support distance adjustment mechanism can move both the support members 50 arranged opposite to each other. However, this is not essential, and one of the support members 50 is moved. Even in this case, the distance between the supports 50 can be adjusted.

  Further, in each of the above-described embodiments, the guide rail 43 is supported by the support 50 as an arrangement form of the guide rail 43. However, the guide rail 43 is supported by a support mechanism (for example, different from the support 50 (for example, It is good also as an independent support form supported by the holding | maintenance mechanism which supports the holding mechanism which isolate | separated the holding member 53 and its mounting part from the support body 50). In this case, it is necessary to add a support mechanism, but it is possible to share the guide rail 43, for example, when processing a pipe to be constructed such that the bent shape of the central portion is substantially the same and the end length and thus the total length are different. In some cases, adjustment of the facing distance of the support 50 can be performed without removing the guide rail 43, resulting in improved work efficiency.

About one Embodiment (1st form) of this invention, the procedure of a curved pipe coating method and the whole structure of the curved pipe coating apparatus suitable for it are shown, (a) is a perspective view of a to-be-constructed pipe body, b) is a perspective view of the clasp metal fitting and the receiving metal fitting, (c) is a perspective view of the fitting fitting attached to the pipe to be constructed, and (d) is an external view of the hook for hanging in the suspended transfer equipment. , (E) is a schematic view corresponding to a perspective view relating to a booth of a heating facility, (f) is a schematic view corresponding to a perspective view relating to a booth of a coating facility, (g) is a perspective view corresponding to a heat dissipation facility, (h) FIG. 3 is a perspective view of a curved pipe coating apparatus. (A) is a perspective view of a curved pipe coating apparatus, (b) is the development. (A) is a perspective view of the support member, (b) is a perspective view of the central portion of the upper end portion of the support, (c) is a perspective view of the support member mounted on the upper end portion of the support, and (d) is a perspective view of the support member. The front view which concerns on the pipe end vicinity cross section of a to-be-executed pipe body and a supporting member of a pipe end support state, (e) is the side view which concerns on the to-be-executed pipe body of a pipe end support state, and the pipe end vicinity cross section is there. (A) and (b) are perspective views of an electrostatic powder coating gun and a housing peripheral plate, (c) is a perspective view of a housing side plate, (d) is an exploded perspective view of a housing side plate, a housing peripheral plate, and a housing side plate, (E) is a perspective view of the annular housing partially expanded, (f) is a perspective view of the annular housing, and (g) is a longitudinal side view of the annular housing. (A) is a longitudinal side view of the annular housing and a side view corresponding to a developed view of the contact ring rolling mechanism, (b) is a longitudinal side view of the drive pinion and the driven rack, (c) is a longitudinal side view of the rolling wheel, (D) And (e) is a front view of a cyclic | annular housing and a traveling body, (f) is a front view which concerns on a rolling wheel and an air feed pipe. About other embodiment (2nd form) of this invention, the structure of a curved pipe coating apparatus is shown, (a), (b) is a whole front view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Pipe body to be constructed, 11 ... Curved pipe part, 12 ... Concave side pipe end, 13 ... Convex side pipe end,
21 ... Hook, 22 ... Cue bracket, 23 ... Receptacle,
31 ... Hanging transfer equipment, 32 ... Heating equipment, 33 ... Coating equipment, 34 ... Heat dissipation equipment,
40 ... curved pipe coating device, 41 ... electrostatic coating machine body,
42 ... dust collector, 43 ... guide rail, 44 ... traveling body,
50 ... Support, 51 ... Base, 52 ... Upper end, 53 ... Gripping member, 54 ... Bearing member,
54a ... pipe end support part, 54b ... pipe end drop part, 55 ... tow ring, 56 ... tow elongate body,
60 ... Annular housing, 61 ... Tube insertion point, 62 ... Electrostatic powder coating gun,
63 ... Housing peripheral plate, 64 ... Housing side plate, 65 ... Mounting leg,
66 ... Housing side plate, 67 ... Mounting leg, 68 ... Intake pipe,
70 ... contact ring rolling mechanism, 71 ... circumferential plate expansion member, 72 ... driven rack,
73 ... Drive pinion, 74 ... Rolling wheel, 75 ... Air pipe,
80 ... curved pipe coating device, 81 ... bearing distance adjustment rail,
82: Supporting distance adjusting caster, 83 ... Traveling driving wheel, 84 ... Path length adjusting wheel

Claims (7)

  A curved pipe coating method for applying a resin coating to the outer peripheral surface of a metal curved pipe, which is a pipe to be constructed, using a heating equipment, a curved pipe coating device, and a suspended transfer equipment, Attach a hanging clasp bracket and a support bracket to both ends, heat the pipe to be installed together with the mounting bracket with the heating equipment, hang the clasp brackets at both ends, and transfer the suspension It is transferred to the curved pipe coating device by the equipment and mounted on the curved pipe coating device in a suspended manner supported at the receiving metal fittings at both ends. A curved pipe coating method characterized in that after painting by moving, the hook metal fittings at both ends are hung again and paid out from the curved pipe coating apparatus by the suspended transfer equipment.   A curved pipe coating apparatus for applying a resin coating to the outer peripheral surface of a heated metal bent pipe having a clasp metal fitting and a receiving metal fitting attached to both ends as a construction pipe body, A pair of supports for supporting both ends are arranged opposite to each other, and when the end of the pipe to be constructed is placed, a support member that makes a pipe end support in contact with the receiving bracket is provided at the upper end of each of the supports. Equipped with a pair of curvilinear guide rails imitating the construction pipe, arranged at positions that are lined up at regular intervals on both sides of the construction pipe supported by the support, A coating machine operating part mounted with a position where a plurality of coating guns surround the pipe free-moving portion is mounted on a splittable annular housing in which a work tube supported by the support can be loosely inserted, with respect to the guide rail. It is attached to the traveling body suspended so that it can run Bend paint-covering apparatus, characterized in that.   The coating gun is an electrostatic powder coating gun, and a contact ring rolling mechanism that swings the coating gun with respect to a work tube supported by the support by reciprocating the housing in the circumferential direction. 3. The tune according to claim 2, wherein the housing is provided at a joint portion of the housing with the traveling body, an intake pipe extending from a dust collector is connected to the housing, and the housing is made of an electrical insulating material. Tube coating equipment.   The contact ring rolling mechanism includes a rolling wheel that rolls in contact with the inner and outer peripheries of the housing, and at least the rolling wheel that rolls in contact with the inner circumference of the housing blows air toward it. 4. A curved pipe coating apparatus according to claim 3, wherein air supply means are arranged side by side.   5. A curved pipe coating according to claim 4, further comprising a support distance adjusting mechanism capable of moving either one or both of the supports arranged opposite to each other to adjust the distance between the supports. Covering device.   The holding mechanism of the guide rail is a detachable type, and a towing long body such as a chain or a rope is stretched over a patrol route including a partial route along the guide rail, and the towing length Both ends of the scale are attached to the traveling body, and travel driving means for sequentially feeding the towing long body and path length adjusting means for locally expanding and contracting the circulation path are provided. The curved pipe coating apparatus according to claim 5.   The support distance adjustment mechanism which can move either one or both of the said support bodies arrange | positioned facing, and can adjust the distance between the said support bodies is provided. The Claim 2 or Claim 3 characterized by the above-mentioned. The described curved pipe coating device.

Images