JP2020066773A - Film formation device and film formation method - Google Patents

Abstract

To form a film efficiently at a surface of a tube by further improving productivity and improving a degree of freedom in choosing a material.SOLUTION: A film formation device (1) includes: rotary rollers (10a and 10b) for rotating a tube (T1); and a spraying part (20) for spraying a thermal spray material discharged from a storage tank (30) for storing the thermal spray material for forming a film with respect to the tube (T1) rotated by the rotary rollers (10a and 10b) from a direction substantially perpendicular to a tangent line (L1) of a circle related to a cross section of the tube (T1).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a film forming apparatus and a film forming method.

  A technique of forming a film on the surface of a tube is known as a conventional technique. For example, in the outer surface anticorrosion pipe disclosed in Patent Document 1, an anticorrosion layer is formed on the surface of a pipe made of an iron-based material, and the anticorrosion layer has Sn in excess of 10% by mass and 50% by mass. And the balance is Zn-Sn alloy sprayed coating with the balance being Zn.

JP, 2013-241682, A (published on December 5, 2013)

  In the technique disclosed in Patent Document 1, in order to form an anticorrosion coating composed of a specific composition, the coating is formed by arc spraying using two kinds of wire rods composed of different materials. There is. However, such a coating forming method may be difficult to improve productivity when the area to be sprayed is large, and it can be applied only to a metal that can be processed into a wire rod, so that the degree of freedom in selecting a material is low. There is such a problem. One aspect of the present invention aims to efficiently form a film on the surface of a tube by further improving productivity and improving the degree of freedom in material selection.

  In order to solve the above problems, a film forming apparatus according to an aspect of the present invention is a film forming apparatus that forms a film on the surface of a pipe, and forms a film and a rotating unit that rotates the pipe. For spraying the thermal spray material discharged from a storage tank for storing the thermal spray material on the tube rotated by the rotating section from a direction substantially perpendicular to a tangent line of a circle relating to the cross section of the tube. And

  According to the above configuration, by spraying the thermal spray material onto the pipe from a direction substantially perpendicular to the tangential line of the circle relating to the cross section of the pipe, it is possible to reduce scattering of the thermal spray material in a direction different from the direction toward the pipe. . Therefore, since the thermal spray material can be efficiently attached to the surface of the pipe, a film can be efficiently formed on the surface of the pipe. Further, since the sprayed material discharged from the storage tank that stores the sprayed material is sprayed onto the pipe, the productivity is further improved and the degree of freedom in material selection is higher than that in the case where the coating is formed by arc spraying. Improvement can be realized.

  The spraying part may be arranged above the center of the pipe, and when the pipe is rotated, the surface of the pipe may be arranged on the side from the upper side to the lower side. According to the above configuration, the thermal spray material sprayed on the pipe is scattered along the rotation direction of the pipe. Therefore, as compared with the case where the spraying section is arranged below the center of the pipe, and the spraying section is arranged on the side where the surface of the pipe faces upward from below when the pipe rotates, The thermal spray material can be more efficiently attached to the surface of the tube.

  The range of the angle formed by the spraying direction of the spraying section and the horizontal plane may be 30 ° or more and 60 ° or less. According to the above configuration, the thermal spray material sprayed on the pipe is scattered along the rotation direction of the pipe. Therefore, the thermal spray material can be efficiently attached to the surface of the pipe.

  In the film forming apparatus, the storage tank is moved from the storage unit by a storage unit that stores the thermal spray material, a variable mechanism that changes the amount of the thermal spray material stored in the storage unit, and the variable mechanism. An auxiliary storage part that stores the thermal spray material, has a second bottom surface that is higher than a first bottom surface of the storage part, and has a discharge hole for discharging the thermal spray material on the second bottom surface; May have.

  According to the above configuration, by maintaining the liquid surface of the spray material stored in the storage tank by the variable mechanism at a position higher than the second bottom surface of the auxiliary storage portion, the spray material can be discharged from the discharge hole. Further, by maintaining the liquid surface of the spray material stored in the storage tank by the variable mechanism at a position lower than the second bottom surface of the auxiliary storage portion, it is possible to stop the discharge of the spray material from the discharge hole.

  Therefore, when the ejection of the thermal spray material is stopped, the liquid level of the thermal spray material is maintained at a position lower than the second bottom surface of the auxiliary reservoir, compared to the case where the ejection of the thermal spray material is stopped by directly closing the ejection hole. Therefore, it is possible to prevent the thermal spray material from leaking to the outside. Further, since the discharge holes are exposed from the spray material when the discharge of the spray material is stopped, maintenance such as cleaning of the discharge holes can be easily performed.

  The second bottom surface may include an inclined surface that is formed so as to approach the first bottom surface from the discharge hole toward the storage portion. According to the above configuration, when the liquid level of the spray material is set to a position lower than the second bottom surface of the auxiliary storage part in order to stop the discharge of the spray material, the spray material flows toward the storage part along the inclined surface. Therefore, it is possible to prevent the thermal spray material from remaining around the ejection holes on the second bottom surface of the auxiliary storage portion. Therefore, it is possible to prevent the thermal spray material from leaking to the outside.

  The variable mechanism may include a pressing unit that presses the thermal spray material stored in the storage unit, and a drive unit that drives the pressing unit to move toward the first bottom surface. According to the above configuration, the liquid surface of the thermal spray material stored in the storage tank is maintained at a position higher than the second bottom surface of the auxiliary storage unit by moving the pushing unit so as to approach the first bottom face of the storage unit. be able to. Thereby, the thermal spray material can be discharged from the discharge hole.

  Further, by moving the pushing portion away from the first bottom surface of the storage portion, the liquid level of the thermal spray material stored in the storage tank can be maintained at a position lower than the second bottom surface of the auxiliary storage portion. This makes it possible to stop the discharge of the thermal spray material from the discharge holes.

  At least one wall portion of the plurality of wall portions forming the storage tank may have a structure in which a heater is sandwiched between at least two plate portions. According to the above configuration, since the temperature of the thermal spray material stored in the storage tank can be maintained, it is possible to prevent the thermal spray material stored in the storage tank from solidifying.

  A film forming method according to an aspect of the present invention is a film forming method for forming a film on a surface of a pipe, which comprises a rotating step of rotating the pipe, and a storage tank for storing a thermal spray material for forming the film. The thermal spray material discharged from the, with respect to the tube being rotated by the rotating step, by spraying from a direction substantially perpendicular to the tangent of the circle pertaining to the cross section of the tube, the coating on the surface of the tube Forming a film.

  According to one aspect of the present invention, it is possible to efficiently form a film on the surface of a tube by further improving productivity and improving the degree of freedom in material selection.

It is a schematic diagram which shows the structure of the film formation apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the film formation method which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the cross section of the storage tank with which the film formation apparatus shown in FIG. 1 is equipped. It is a top view which concerns on the storage tank shown in FIG. It is the side view which looked at the storage tank shown in FIG. 3 from the right direction in a paper surface. It is a perspective view which shows the structure of a wall part (bottom surface) about the storage tank shown in FIG.

[Embodiment 1]
(Structure of film forming apparatus 1)
FIG. 1 is a schematic diagram showing a configuration of a film forming apparatus 1 according to the first embodiment of the present invention. The film forming device 1 is a device that forms a film on the surface of the tube T1, and includes rotating rollers 10a and 10b (rotating part), a spraying part 20, a storage tank 30, and a support base 40 as shown in FIG. ing. The rotating rollers 10a and 10b rotate themselves, and rotate the tube T1 by rotating while being in contact with the tube T1. The rotating rollers 10a and 10b should be replaced with a member or mechanism capable of rotating the tube T1 (for example, a rotating shaft is provided at the center of the tube T1 and the rotating shaft is rotated by a belt or a chain). You can also

  Further, the number of rotating rollers is not limited to two as shown in FIG. 1, and may be any number as long as the tube T1 is stably rotated. The tube T1 is made of metal and has a diameter of 200 mm or more and 1000 mm or less, but the material and dimensions of the tube to which the present invention can be applied are not limited thereto.

  The spraying section 20 is, for example, a spray nozzle for spraying the thermal spray material M1 onto the surface of the tube T1. The spraying unit 20 applies the spray material M1 discharged from the storage tank 30 that stores the spray material M1 to the pipe T1 rotated by the rotating rollers 10a and 10b and a tangent line L1 of a circle relating to the cross section of the pipe T1. Spray from a substantially vertical direction D1.

  Specifically, the spray unit 20 has a jet port 21, and the jet port 21 faces the direction D1 so that the thermal spray material M1 can be jetted onto the pipe T1 from the direction D1. In other words, the ejection port 21 faces the center O of the pipe T1. In addition, the direction D1 substantially perpendicular to the tangent line L1 can reduce scattering of the thermal spray material M1 in a direction different from the direction toward the tube T1, and efficiently attach the thermal spray material M1 to the surface of the tube T1. The direction D1 is perpendicular to the tangent line L1 to the extent that it can be made.

  In this way, by spraying the thermal spray material M1 onto the pipe T1 from the direction D1 substantially perpendicular to the tangent line L1 of the circle relating to the cross section of the pipe T1, it is possible to prevent the thermal spray material M1 from scattering in a direction different from the direction toward the pipe T1. It can be reduced. Therefore, the thermal spray material M1 can be efficiently attached to the surface of the tube T1, and thus a film can be efficiently formed on the surface of the tube T1. Further, since the thermal spray material M1 discharged from the storage tank 30 that stores the thermal spray material M1 is sprayed onto the pipe T1, productivity is further improved and material selection is made as compared with the case of forming a coating by arc thermal spraying. The degree of freedom of can be improved.

  The thermal spray material M1 discharged from the storage tank 30 is a material for forming a film formed on the surface of the tube T1. The raw material of the thermal spray material M1 may be, for example, a low melting point metal such as Zn, Al, Sn, or Mg, but is not particularly limited. When the raw material of the thermal spray material M1 is a metal having a low melting point, the raw material of the thermal spray material M1 can be easily melted and the thermal spray material M1 stored in the storage tank 30 can be easily generated. The raw material of the thermal spray material M1 may be melted in the storage tank 30, or may be stored in the storage tank 30 after being melted in a melting furnace for melting the raw material of the thermal spray material M1.

  Further, after the thermal spray material M1 is stored in the storage tank 30, the thermal spray material M1 is discharged from the storage tank 30, so that a mixture of a plurality of different types of materials can be discharged as the thermal spray material M1. As a result, as compared with the case where the thermal spray material M1 is generated by arc thermal spraying, what is generated by mixing more types of materials can be discharged as the thermal spray material M1. Therefore, the thermal spray material M1 in which a larger number of types of materials are mixed can be sprayed onto the pipe T1, and the range of types of coating formed on the surface of the pipe T1 can be widened. The reason is that the material that cannot be made into a wire cannot be produced as the spray material M1 by arc spraying.

  It is preferable that the spraying section 20 is arranged above the center O of the tube T1 and on the side where the surface of the tube T1 faces downward from above when the tube T1 rotates. As shown in FIG. 1, for example, when the tube T1 is rotating clockwise, the side where the surface of the tube T1 goes from the upper side to the lower side is the right side of the tube T1. That is, when the pipe T1 is rotating clockwise, the spraying section 20 is arranged on the right side of the pipe T1.

  On the other hand, when the tube T1 is rotating counterclockwise, the surface of the tube T1 from the upper side to the lower side is the left side of the tube T1. That is, when the tube T1 rotates counterclockwise, the spraying section 20 is arranged on the left side of the tube T1. With such a configuration, the thermal spray material M1 sprayed on the tube T1 is scattered along the rotation direction of the tube T1. Therefore, when the spraying section 20 is arranged below the center O of the tube T1, and when the spraying section 20 is arranged on the side where the surface of the tube T1 goes upward from below when the tube T1 rotates. The thermal spray material M1 can be more efficiently adhered to the surface of the tube T1 as compared with the case where the pipe T1 is present.

  Further, the range of the angle α formed by the spraying direction D1 by the spraying section 20 and the horizontal plane H1 is preferably 30 ° or more and 60 ° or less. The spraying direction D1 by the spraying part 20 is the same as the direction D1 substantially perpendicular to the tangent line L1 of the circle relating to the cross section of the tube T1. The horizontal plane H1 is a plane parallel to the floor surface F1 on which the film forming apparatus 1 is arranged. When the range of the formed angle α is 30 ° or more and 60 ° or less, the thermal spray material M1 sprayed on the tube T1 is scattered along the rotation direction of the tube T1. Therefore, the thermal spray material M1 can be efficiently attached to the surface of the tube T1. The support base 40 is a base that supports the rotating rollers 10a and 10b and the tube T1. The support base 40 is arranged on the floor surface F1.

(Film forming method)
FIG. 2 is a diagram showing a film forming method according to the first embodiment of the present invention. As shown in FIG. 2, the film forming apparatus 1 may include four rotating rollers 10a, 10b, 10c, and 10d. Further, the film forming apparatus 1 may include one storage tank, but may include a plurality of storage tanks. In FIG. 2, the film forming apparatus 1 includes two storage tanks 30 and 30a. The shape of the storage tank 30a is the same as the shape of the storage tank 30. As a film forming method for forming a film on the surface of the tube T1, first, the tube T1 is rotated by rotating the four rotating rollers 10a, 10b, 10c, 10d (rotating step).

  After rotating the tube T1, the tube T1 is moved along the longitudinal direction of the tube T1. When moving the tube T1, the support base 40 that supports the tube T1 is moved along the longitudinal direction of the tube T1. While moving the pipe T1, the spraying material M1 discharged from the storage tanks 30 and 30a is applied to the cross section of the pipe T1 by the spraying unit 20 with respect to the pipe T1 which is rotated by the rotating rollers 10a, 10b, 10c, and 10d. Spray from a direction D1 that is substantially perpendicular to the tangent line L1 of the circle.

  By spraying the thermal spray material M1 onto the tube T1, a film is formed on the surface of the tube T1 (film forming step). Specifically, the thermal spray material M1 sprayed on the surface of the tube T1 hardens over time to form a film on the tube T1. The spraying section 20 is arranged near each of the storage tanks 30 and 30a.

  The distance DT1 between the storage tank 30 and the storage tank 30a may be half the length DT2 in the longitudinal direction of the pipe T1. As a result, the distance to move the pipe T1 is half as compared with the case of one storage tank, so that the time required for spraying the thermal spray material M1 can be shortened. The distance to move the tube T1 is the same as the distance DT1. Alternatively, the thermal spray material M1 may be sprayed onto the surface of the pipe T1 by moving the storage tanks 30 and 30a along the longitudinal direction of the pipe T1 without moving the pipe T1.

[Embodiment 2]
Another embodiment of the present invention will be described below. For convenience of description, members having the same functions as the members described in the above embodiment will be designated by the same reference numerals, and the description thereof will not be repeated.

(Structure of storage tank 30)
The storage tank 30 stores the thermal spray material M1 for forming a film on the surface of the pipe T1. The storage tank 30 is arranged near the spraying section 20, as shown in FIG. 1. The storage tank 30 is arranged so as to be inclined with respect to the longitudinal direction of the tube T1 so that the spraying section 20 can spray the thermal spray material M1 discharged from the storage tank 30 onto the tube T1. Specifically, the direction in which the storage unit 305 and the auxiliary storage unit 310, which will be described later, are arranged is inclined in the longitudinal direction of the pipe T1. As shown in FIGS. 3 to 5, the storage tank 30 includes a storage section 305, an auxiliary storage section 310, and a variable mechanism 330. 3 is a cross-sectional view showing a cross section of the storage tank 30 included in the film forming apparatus 1 shown in FIG. 1, FIG. 4 is a top view of the storage tank 30 shown in FIG. 3, and FIG. It is the side view which looked at the storage tank 30 shown in FIG.

  The storage part 305 is a part that stores the thermal spray material M1 in the storage tank 30. As shown in FIG. 3, an auxiliary storage part 310 is provided on the side of the storage part 305, and the space formed by the storage part 305 is integrated with the space formed by the auxiliary storage part 310. The auxiliary storage part 310 has a second bottom surface 320, and the second bottom surface 320 is higher than the first bottom surface 315 of the storage part 305. The upper portions of the storage section 305 and the auxiliary storage section 310 are open so that the thermal spray material M1 can be supplied to the storage tank 30.

  That is, when the thermal spray material M1 is stored in the storage section 305, the auxiliary storage section 310 stores the thermal spray material M1 moved from the storage section 305 by the variable mechanism 330 described later. Specifically, when the spraying material M1 stored in the storage portion 305 is pushed by the pushing portion 331 of the variable mechanism 330, the liquid level of the spraying material M1 stored in the storage portion 305 rises and the liquid surface is assisted. It is higher than the second bottom surface 320 of the storage part. As a result, a part of the thermal spray material M1 stored in the storage unit 305 moves to the auxiliary storage unit 310.

  As shown in FIG. 4, in the vertical direction in FIG. 4, the width of the auxiliary storage unit 310 along the vertical direction is the same as the width of the storage unit 305 along the vertical direction. The width of the auxiliary storage portion 310 along the vertical direction may be smaller than the width of the storage portion 305 along the vertical direction. The up-down direction is a direction that is perpendicular to the direction in which the storage section 305 and the auxiliary storage section 310 are arranged, and is also perpendicular to the direction in which two plate portions B1 and B2 described later are arranged.

  A discharge hole 325 for discharging the thermal spray material M1 is formed in the second bottom surface 320 of the auxiliary storage part 310. The ejection hole 325 has a shape protruding downward from the second bottom surface 320. That is, the pipe projects downward from the second bottom surface 320. When a part of the thermal spray material M1 stored in the storage part 305 moves to the auxiliary storage part 310 by the thermal spray material M1 stored in the storage part 305 being pushed by the pushing part 331, it is stored in the auxiliary storage part 310. The thermal spray material M1 is discharged from the discharge holes 325. The shape of the discharge hole 325 is preferably a shape that extends straight. Accordingly, the ejection hole 325 can be easily cleaned.

  By maintaining the liquid level of the thermal spray material M1 stored in the storage tank 30 by the variable mechanism 330 at a position higher than the second bottom surface 320 of the auxiliary storage section 310, the thermal spray material M1 can be discharged from the discharge holes 325. . Further, by maintaining the liquid surface of the spray material M1 stored in the storage tank 30 by the variable mechanism 330 at a position lower than the second bottom surface 320 of the auxiliary storage portion 310, the discharge of the spray material M1 from the discharge hole 325 is stopped. can do.

  Therefore, when the discharge of the thermal spray material M1 is stopped, the liquid level of the thermal spray material M1 is higher than that of the second bottom surface 320 of the auxiliary storage portion 310, compared to the case where the discharge of the thermal spray material M1 is stopped by directly closing the discharge hole 325. Since it is maintained at a low position, it is possible to prevent the thermal spray material M1 from leaking to the outside. Furthermore, since the discharge holes 325 are exposed from the spray material M1 when the discharge of the spray material M1 is stopped, maintenance such as cleaning of the discharge holes 325 can be easily performed.

  Note that a plurality of auxiliary storage sections may be provided for one storage section 305, and a plurality of ejection holes 325 may be formed for one storage section 305. Specifically, a plurality of auxiliary storage parts may be provided on the side of one storage part 305. In this case, the plurality of auxiliary storage units are connected via one storage unit 305. Further, one or a plurality of ejection holes 325 may be formed in each of the plurality of auxiliary storage portions. Further, a plurality of ejection holes 325 may be formed on the second bottom surface 320 of one auxiliary storage part 310.

  In addition, as shown in FIGS. 3 and 4, the second bottom surface 320 of the auxiliary storage part 310 is formed so as to approach the first bottom surface 315 of the storage part 305 from the discharge hole 325 toward the storage part 305. A surface 322 is included. Specifically, the second bottom surface 320 of the auxiliary storage unit 310 includes a horizontal surface 321 that is a horizontal surface and an inclined surface 322 that is an inclined surface. Discharge holes 325 are formed in the horizontal surface 321.

  The inclined surface 322 is a surface existing between the horizontal surface 321 on which the discharge holes 325 are formed and the storage portion 305. The inclined surface 322 is a surface inclined so as to descend from the discharge hole 325 toward the storage portion 305. The horizontal surface 321 may not be formed on the second bottom surface 320, and only the inclined surface 322 may be formed. In this case, the discharge hole 325 is formed in the inclined surface 322.

  According to such a configuration, when the liquid surface of the thermal spray material M1 is set at a position lower than the second bottom surface 320 of the auxiliary reservoir 310 in order to stop the discharge of the thermal spray material M1, the thermal spray material M1 follows the inclined surface 322. And flows toward the reservoir 305. Therefore, it is possible to reduce the amount of the thermal spray material M1 remaining around the ejection holes 325 on the second bottom surface 320 of the auxiliary storage portion 310. Therefore, it is possible to prevent the thermal spray material M1 from leaking to the outside. Further, the maintenance of the auxiliary storage section 310 and the ejection holes 325 can be easily performed.

  A drainage hole DR1 is formed on the inner surface above the storage portion 305. The drainage hole DR1 is a hole for discharging the thermal spray material M1 stored in the storage section 305 to the outside of the storage tank 30 after the operation of spraying the thermal spray material M1 onto the pipe T1 is completed. When the work of spraying the thermal spray material M1 onto the pipe T1 is being performed, the liquid discharge hole DR1 is formed in the storage portion 305 so that the thermal spray material M1 stored in the storage portion 305 is not discharged to the outside from the liquid discharge hole DR1. It is formed on the upper part of the inner surface.

  As shown in FIG. 4, the drainage hole DR1 has a shape protruding laterally from the wall portion W3. That is, the pipe projects laterally from the wall W3. By forming the drainage hole DR1 on the inner surface above the storage portion 305, the wall portions W2, W3, etc. are compared with the case where the thermal spray material M1 is discharged to the outside from the open portion above the storage portion 305. It is possible to prevent the thermal spray material M1 from adhering to a heater, which will be described later, provided in the. The drainage hole DR1 may not be formed in the storage tank 30.

  As shown in FIG. 5, the variable mechanism 330 includes a pushing portion 331, a driving portion 332, and a plate portion 333. The variable mechanism 330 changes the amount of the thermal spray material M1 stored in the storage unit 305. The pushing unit 331 pushes the thermal spray material M1 stored in the storage unit 305 when the driving unit 332 drives the pushing unit 331.

  The pressing portion 331 may be, for example, steel, steel, stainless steel, or the like having a higher melting point than the thermal spray material M1, but is not particularly limited as long as it has a higher melting point than the thermal spray material M1. That is, the melting point of the material of the pressing portion 331 is higher than the melting point of the thermal spray material M1. As a result, even if the pressing portion 331 is pressed into the thermal spray material M1, it is possible to prevent the material of the pressing portion 331 from melting into the thermal spray material M1. The pressing portion 331 may have a prismatic shape or a cylindrical shape, but is particularly preferable as long as the thermal spray material M1 can be pushed in and the liquid level of the thermal spray material M1 can be raised. Not limited.

  Further, a heater may be provided inside the pressing unit 331. When the pressing portion 331 is pushed into the thermal spray material M1, the pressing portion 331 is heated by the heater, whereby heat is transferred to the thermal spray material M1 via the pressing portion 331. Further, the pressing portion 331 may be heated in advance before the pressing portion 331 is pressed into the thermal spray material M1.

  As a result, the thermal spray material M1 is also heated, and it is possible to prevent the thermal spray material M1 from solidifying. Therefore, the thermal spray material M1 can be discharged from the storage tank 30 in a state where the thermal spray material M1 is a liquid. Therefore, the thermal spray material M1 can be sprayed onto the pipe T1 in a state where the thermal spray material M1 is liquid.

  The drive unit 332 is connected to the pushing unit 331 via the plate unit 333. The drive unit 332 drives the push unit 331 to move toward the first bottom surface 315 of the storage unit 305 by moving the position of the plate unit 333 up and down. The driving unit 332 may be, for example, an air cylinder, but is not particularly limited as long as it can drive the pushing unit 331 toward the first bottom surface 315 of the storage unit 305.

  According to such a configuration, by moving the pushing portion 331 so as to approach the first bottom surface 315 of the storage portion 305, the liquid surface of the thermal spray material M1 stored in the storage tank 30 is moved to the first storage surface of the auxiliary storage portion 310. 2 can be maintained at a position higher than the bottom surface 320. As a result, the thermal spray material M1 can be discharged from the discharge hole 325.

  Further, by moving the pushing portion 331 away from the first bottom surface 315 of the storage portion 305, the liquid level of the thermal spray material M1 stored in the storage tank 30 is set to a position lower than the second bottom surface 320 of the auxiliary storage portion 310. Can be maintained. As a result, the discharge of the thermal spray material M1 from the discharge hole 325 can be stopped.

  FIG. 6 is a perspective view showing the structure of the wall portion W1 (bottom surface) of the storage tank 30 shown in FIG. The upper surface of the wall portion W1 is the first bottom surface 315 of the storage portion 305, as shown in FIG. As shown in FIG. 6, the wall portion W1 includes two plate portions B1 and B2 and four heaters h1 to h4. The wall portion W1 has a structure in which four heaters h1 to h4 are sandwiched between two plate portions B1 and B2.

  The heaters h1 to h4 are fitted in the recesses formed in the plate portions B1 and B2, respectively. The lengths of the heaters h1 to h4 in the longitudinal direction are longer than the length of one side of the plate portions B1 and B2. The plate parts B1 and B2 are fixed to each other with a plurality of bolts BB1. The lengths of the heaters h1 to h4 in the longitudinal direction may be the same as the length of one side of the plate portions B1 and B2.

  Further, the side surface of the wall portion W2 is the side surface of the storage portion 305 and the side surface of the auxiliary storage portion 310, as shown in FIG. Like the wall W1, the wall W2 has a structure in which a heater is sandwiched between two plate parts B3 and B4. Furthermore, the side surface of the wall portion W3 is the side surface of the storage portion 305 and the side surface of the auxiliary storage portion 310, as shown in FIG. Similar to the wall W1, the wall W3 has a structure in which a heater is sandwiched between two plate parts B5 and B6.

  In addition, among the plurality of wall portions forming the storage tank 30, the wall portions other than the wall portions W1 to W3 may also have a structure in which the heater is sandwiched between the two plate portions. That is, at least one wall portion of the plurality of wall portions forming the storage tank 30 has a structure in which the heater is sandwiched between at least two plate portions.

  Thereby, the temperature of the thermal spray material M1 stored in the storage tank 30 can be maintained, and thus the thermal spray material M1 stored in the storage tank 30 can be prevented from solidifying. Therefore, the thermal spray material M1 can be discharged from the storage tank 30 in a state where the thermal spray material M1 is liquid. Therefore, the thermal spray material M1 can be sprayed on the pipe T1. The number of heaters sandwiched between the two plate portions in these wall portions is not particularly limited. Further, the “wall portion” also includes the bottom surface like the wall portion W1.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention.

1 Film forming device 10a, 10b, 10c, 10d Rotating roller (rotating part)
20 spraying section 30, 30a storage tank 305 storage section 310 auxiliary storage section 315 first bottom surface 320 second bottom surface H1 horizontal plane 322 inclined surface 325 discharge hole 330 variable mechanism 331 pushing section 332 drive section B1, B2, B3, B4, B5, B6 Plate portion D1 direction h1, h2, h3, h4 Heater L1 Tangent line M1 Thermal spray material T1 Pipe W1, W2, W3 Wall α angle

Claims (8)

A film forming apparatus for forming a film on the surface of a pipe,
A rotating part for rotating the tube,
The thermal spray material discharged from a storage tank that stores the thermal spray material for forming the coating is substantially perpendicular to a tangent line of a circle related to the cross section of the tube with respect to the tube being rotated by the rotating unit. And a spraying unit for spraying from a direction.   The spray unit is arranged above the center of the pipe, and when the pipe rotates, the surface of the pipe is arranged on the side from the upper side to the lower side. The film forming apparatus according to 1.   The film forming apparatus according to claim 1, wherein the range of the angle formed by the spraying direction of the spraying section and the horizontal plane is 30 ° or more and 60 ° or less. The storage tank is
A reservoir for storing the thermal spray material,
A variable mechanism for varying the amount of the thermal spray material stored in the storage section;
A discharge hole for storing the thermal spray material moved from the storage section by the variable mechanism and having a second bottom surface higher than the first bottom surface of the storage section and discharging the thermal spray material to the second bottom surface. The auxiliary | assistant storage part in which is formed, The film formation apparatus of any one of Claim 1 to 3 characterized by the above-mentioned.   The film forming apparatus according to claim 4, wherein the second bottom surface includes an inclined surface that is formed so as to approach the first bottom surface from the discharge hole toward the storage portion.   The variable mechanism includes a pressing unit that presses the thermal spray material stored in the storage unit, and a drive unit that drives the pressing unit to move toward the first bottom surface. Item 4. The film forming apparatus according to item 4 or 5.   7. At least one wall portion of the plurality of wall portions forming the storage tank has a structure in which a heater is sandwiched between at least two plate portions. The film forming apparatus according to item. A film forming method for forming a film on the surface of a pipe,
A rotating step of rotating the tube,
The thermal spray material discharged from a storage tank that stores the thermal spray material for forming the coating is substantially perpendicular to a tangent line of a circle relating to the cross section of the tube, with respect to the tube being rotated by the rotating step. And a film forming step of forming the film on the surface of the tube by spraying from a direction.

Images