JP2017023888A - Outer surface coating device and outer surface coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer surface coating device capable of preventing entry of a coating into a pipe inner surface, and efficiently advancing outer surface coating of a pipe.SOLUTION: An outer surface coating device 1 includes a closing mechanism 4 for closing an opening on at least one end P1 of a shell P. The closing mechanism 4 includes a shield plate 41 capable of covering the opening on at least one end P1 of the shell P, a moving mechanism 42 for moving the shield plate 41 toward the end P1 of the shell P, and an energizing member 43 for energizing the shield plate 41 toward the end P1 of the shell P.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an outer surface coating apparatus and an outer surface coating method for a tubular body.

  Tubing bodies such as cast iron pipes widely used for water pipes and the like are coated with a paint in order to impart corrosion resistance to the inner and outer surfaces of the pipe body. For example, in cast iron pipes used for water pipes, the inner surface of the pipe is subjected to, for example, mortar lining or epoxy resin powder coating in consideration of corrosion resistance and hygiene, and the outer surface of the pipe is, for example, zinc-based Thermal spraying is performed, and a sealing agent or a synthetic resin paint is applied thereon.

  The outer surface of the pipe is painted by, for example, spray coating in which a paint is sprayed from a spray gun. Since both ends of the tubular body are open, a mist-like paint at the time of external coating, powders and solids generated by external coating may enter the internal surface of the tubular body. In this case, when mist-like paint, paint powder or solid matter (hereinafter simply referred to as paint) resulting from painting enters the inner surface of the pipe body, sanitary problems caused by the remaining paint on the inner face of the pipe Is not preferable.

  Patent Document 1 discloses a coating masking 100 that protects the inner surface of a pipe from painting when the outer surface of the pipe is painted, as shown in FIG. This coating masking 100 has a short cylindrical edge body 103 in close contact with the outer peripheral edge of an elastic disc 102 having an outer diameter substantially equal to the inner diameter of the pipe end opening surface 101 along the inner peripheral surface of the pipe end. A grip handle 104 is provided on the surface of the elastic disc 102 that is integrally formed. In the coating masking 100, when coating the outer surface of the pipe after the inner surface coating, the operator pushes the coating masking 100 into the pipe end opening surface 101 with the handle 104 and moves the pipe ends on both sides. Close. When the outer surface coating of the pipe is completed, the operator holds the handle 104 and pulls out the coating mask 100 from the pipe ends on both sides.

Japanese Patent Laid-Open No. 11-16964

  However, in the painting masking 100 of Patent Document 1, the operator holds the handle 104 for each pipe, pushes the painting masking 100 into the pipe end opening surface 101, and when the painting is completed, the painting masking 100 is piped. It is necessary to pull out from the end opening surface 101. When painting a pipe, it is necessary to process a large number of pipes sent one after another. Therefore, the painting masking 100 of Patent Document 1 is inefficient, and the throughput in painting the pipe is greatly reduced.

  Therefore, in view of such problems, the present invention provides an outer surface coating apparatus and an outer surface coating method that can prevent the coating material from entering the inner surface of the tube and can efficiently proceed with the outer surface coating of the tube. With the goal.

  The outer surface coating apparatus of the present invention is an outer surface coating apparatus that sprays paint onto the outer surface of a tubular body, and the outer surface coating apparatus includes a closing mechanism that closes an opening of at least one end of the tubular body, A closing mechanism capable of covering an opening of at least one end of the tubular body; a moving mechanism for moving the shielding plate toward an end of the tubular body; and And an urging member that urges toward the end of the tubular body.

  Moreover, it is preferable that the said outer surface coating apparatus is equipped with the rotation apparatus which rotates the said pipe body around the axis | shaft of a pipe body, and the said shielding board is rotatably provided according to rotation of the said pipe body.

  Further, the closing mechanism is provided on one end side of the tube body, and a dust collecting mechanism is provided on the other end side of the tube body to generate an air flow away from the other end portion. It is preferable.

  The outer surface coating apparatus includes a pair of clamp portions that clamp the tube body from both ends of the tube body, and the pair of clamp portions can move the pair of clamp portions toward an end portion of the tube body. The closing mechanism is provided in one clamp part of the pair of clamp parts, and the shielding plate is in the state before the tube body is clamped by the clamp part. It is preferable that the urging member is provided between the shielding plate and the one clamp part.

  The shield plate includes a disk-shaped shield plate base and a contact portion attached to the shield plate base and in contact with an end portion of the tubular body, and the contact portion is formed of a low friction member. It is preferable that

  The shielding plate includes a disk-shaped shielding plate base and a contact portion attached to the shielding plate base and abutting against an end portion of the tubular body, and the contact portion is formed of wear-resistant rubber. It is preferable.

  An outer surface coating method of the present invention is an outer surface coating method for coating the outer surface of a tubular body using the outer surface coating apparatus, the step of placing the tubular body at a predetermined position, and the end of the disposed tubular body. A step of moving the shielding plate toward the part, bringing the shielding plate into contact with one end of the tubular body, and pressing the shielding plate toward the end by the biasing member, The method includes a step of closing an opening at an end of the tubular body, and a step of spraying paint onto the outer surface of the tubular body while rotating the tubular body about an axis.

  According to the present invention, the coating material can be prevented from entering the inner surface of the pipe, and the outer surface of the pipe can be efficiently painted.

It is the schematic which shows the outer surface coating apparatus of one Embodiment of this invention. It is a cross-sectional view of the tubular body arrange | positioned at the outer surface coating apparatus of FIG. It is a fragmentary sectional view which shows the shielding board and shaft of the outer surface coating apparatus of FIG. It is a top view which shows the state which the shielding board contact | abutted to the several pipe body. It is the schematic which shows the outer surface coating apparatus of other embodiment. It is the schematic which shows the state by which the pipe body was clamped by the clamp part of the outer surface coating apparatus of FIG. It is sectional drawing which shows the conventional masking for coating.

  Hereinafter, an external surface coating apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, the external surface coating apparatus of this invention is not limited to embodiment shown below.

<First Embodiment>
As shown in FIG. 1, the outer surface coating apparatus 1 of the present embodiment is used when, for example, the outer surface of a tubular body P such as a cast iron pipe used for a water pipe or the like is painted. The inner surface of the pipe body P may be coated before or after the outer surface coating, but in this embodiment, the outer surface coating is performed after the inner surface coating of the tube body P is performed as an example. explain. Although the method of inner surface coating is not particularly limited, mortar lining or epoxy resin powder coating is applied to the inner surface of the tube P from the viewpoint of corrosion resistance and hygiene. The method for coating the outer surface of the tube P is not particularly limited. For example, after zinc-based thermal spraying is performed, a sealing agent or a synthetic resin paint is applied thereon. In the embodiment described below, the outer surface coating apparatus 1 when applying a synthetic resin paint to the outer surface of the tube P will be described as an example.

  As shown in FIG. 1, an outer surface coating apparatus 1 according to the present embodiment is provided with a tubular body P, a rotating device 2 that rotates the tubular body P around the axis of the tubular body P, and sprays paint onto the tubular body P. The injection device 3 to be provided. The injection device 3 injects mist-like paint by an injection unit such as a spray gun 31. The coating material sprayed from the spraying device 3 is not particularly limited as long as it can provide the pipe body P with anticorrosive properties. For example, it is specified in JWWA K 139 “Ductile iron pipe synthetic resin coating material for waterworks” of the Japan Water Works Association standard. Water-based paints such as synthetic resin paints are used.

  In the present embodiment, as shown in FIG. 1, the injection device 3 is provided above the pipe body P, and when the injection device 3 moves in the axial direction of the pipe body P, paint is applied to the outer surface of the pipe body P. Inject. In the present embodiment, as shown in FIG. 1, the spray gun 31 moves along a guide 32 extending along the axial direction of the tube P above the installed tube P, while the tube P A mist-like paint is sprayed on the outer surface of the. Instead of moving the injection device 3 in the axial direction of the pipe body P, the outer surface of the pipe body P may be painted by moving the pipe body P in the axial direction by a carriage C or the like as will be described later.

  The rotating device 2 rotates the tube P around its axis in order to apply paint in the circumferential direction of the tube P. In this embodiment, as shown in FIGS. 1 and 2, the rotating device 2 includes a roller 21, and the tube body P is located on each of the insertion port P1 side and the receiving port P2 side of the tube body P. The tube P is rotated by being supported by the pair of rollers 21 and rotating the rollers 21. In the present embodiment, as shown in FIG. 1, the rotating device 2 serving as a support that supports the tube P is a carriage C that is movable in the axial direction of the tube P while supporting the tube P. Is provided. In the present embodiment, the carriage C moves while supporting the tubular body P in a direction opposite to the direction in which the spray gun 31 of the injection device 3 moves (for example, the left side in FIG. 1) (for example, in FIG. 1). The outer surface of the tube P is painted. In addition, the structure of the injection device 3, the injection method, the movement method in the axial direction of the pipe body P, and the rotation method are not limited to those shown in the present embodiment, and other structures and methods may be used.

  Moreover, the external surface coating apparatus 1 of this embodiment is provided with the closing mechanism 4 which closes the opening of the at least one edge part (end part by the side of the insertion port P1) of the pipe body P, as FIG. 1 shows. . As shown in FIG. 1 and FIG. 3, the closing mechanism 4 includes a shielding plate 41 that can cover an opening of at least one end of the tube P, and a shielding plate 41 at the end of the tube P. A moving mechanism 42 that moves the shielding plate 41 toward the end of the tubular body P is provided. In the present embodiment, as shown in FIG. 1, the closing mechanism 4 further includes a gantry 44 and a shaft 45 that extends in the horizontal direction from the gantry 44 and is connected to the shielding plate 41 at the distal end side thereof.

  As shown in FIG. 1, the gantry 44 is movably connected to a support base 5 attached to the carriage C. More specifically, a guide portion 51 extending in a substantially horizontal direction is formed on the support base 5 extending in the substantially horizontal direction from the carriage C, and the gantry 44 is guided by the guide portion 51 and the moving mechanism 42 is driven. Thus, the gantry 44 (and the shielding plate 41) can be moved to and away from one end of the tube P (the end surface of the insertion port P1). Further, as shown in FIG. 1, the gantry 44 is provided with a height adjusting mechanism 46 shown as a handle capable of operating the vertical position of the shaft 45. The position of the shielding plate 41 can be adjusted accordingly.

  In this embodiment, the moving mechanism 42 uses an air cylinder, one end (right end in FIG. 1) of the air cylinder is fixed to the support base 5, and the other end (left end in FIG. 1). Part) is fixed to the gantry 44, and the gantry 44 (shielding plate 41) is moved toward the end of the tube P by expansion and contraction of the rod of the air cylinder. However, the structure of the moving mechanism 42 is not particularly limited as long as the gantry 44 (the shielding plate 41) can be moved, and other known mechanisms may be used.

  In this embodiment, as shown in FIG. 3, the shaft 45 is inserted into a cylindrical body 47 in which a part of the shaft 45 is fixed to the gantry 44, and can move in the axial direction with respect to the cylindrical body 47. Is attached. Further, the distal end portion of the shaft 45 is attached to the central portion of the shielding plate 41. Although details will be described later, in this embodiment, as shown in FIG. The shield plate 41 can be rotated with respect to the shaft 45.

  As shown in FIGS. 1 and 2, the shielding plate 41 is formed to have a size that can cover the opening P1 of the tube P or the opening of the insertion port P2. Although the shape of the shielding board 41 is not specifically limited, In this embodiment, as shown in FIG. 2, it is formed in a disk shape. Further, as shown in FIG. 3, the shielding plate 41 of the present embodiment includes a disk-shaped shielding plate base 41 a and a contact portion 41 b that is attached to the shielding plate base 41 a and comes into contact with the end of the tubular body P. It has. In the present embodiment, as shown in FIG. 2, the contact portion 41b is locked to the shield plate base 41a by engaging the contact portion 41b with the peripheral edge of the disk-like member to which the bearing 48 is attached. A locking portion E that prevents the plate base 41a from falling off is formed in an annular shape.

  Although the material of the contact part 41b is not specifically limited, In this embodiment, it is formed with low friction members, such as MC nylon (trademark), for example. Since the contact portion 41b is formed of a low friction member, it is possible to suppress wear and damage due to friction of the tube body P when the contact portion 41b contacts the end surface of the tube body P. The contact portion 41b may be wear-resistant rubber. When wear-resistant rubber is used for the contact portion 41b, the contact portion 41b is not easily worn, and thus the life of the contact portion 41b can be extended. In the present embodiment, the contact portion 41b is shown as a single layer, but the contact portion 41b is not limited to a single layer, and may have a multilayer structure.

  Moreover, in this embodiment, as FIG.1 and FIG.3 shows, between the shielding board 41 and the mount frame 44, the shielding board 41 is toward the edge part (end surface of the insertion port P1) of the tubular body P. As shown in FIG. A biasing member 43 for biasing is interposed. In this embodiment, the urging member 43 is shown as a compression coil spring provided on the outer peripheral side of the shaft 45, and both ends of the spring are a flange portion 45 a on the distal end side of the shaft 45 and a spring seat 45 b on the gantry 44 side. The shielding plate 41 is urged toward the end of the tube P. The urging member 43 is not limited to the compression coil spring, and may be another known urging member as long as the shielding plate 41 can be urged toward the end of the tubular body P. Further, the arrangement position and fixing method of the urging member are not particularly limited.

  Thus, the closing mechanism 4 urges the shielding plate 41, the moving mechanism 42 that moves the shielding plate 41 toward the end of the tube P, and the shielding plate 41 toward the end of the tube P. And an urging member 43. Therefore, in a state where the tube P is installed, the moving mechanism 42 moves until the shielding plate 41 contacts the end of the tube P, and the opening of the end of the tube P can be closed. It is possible to prevent a mist-like paint floating in the air from entering the inner surface of the pipe during painting by the device 3. Furthermore, the opening of the end of the tube P can be closed only by moving the shield 41 toward the end of the tube P by the moving mechanism 42. After painting, the shield 41 is moved to the tube P. Since it is only necessary to move in a direction away from the end of the tube P, continuous processing of the tube body P becomes easy, and the outer surface coating of the tube body P can be efficiently advanced.

  Below, the effect of the outer surface coating apparatus 1 of this embodiment is demonstrated.

  As shown in FIG. 1, the moving mechanism 42 is driven after the tube P is placed on a predetermined position, that is, on the roller 21. When the moving mechanism 42 is driven, the gantry 44 of the closing mechanism 4 is guided by the guide portion 51 of the support 5 and moves toward the end face of the insertion port P1 of the tubular body P. Thereby, the shielding board 41 moves toward the end surface of the insertion port P1 of the tubular body P together with the gantry 44, and the shielding plate 41 contacts the end surface of the insertion port P1. At the time of this contact, the shielding plate 41 moves in the axial direction while compressing the urging member 43, so that the impact at the time of contact is absorbed, and the tube body P and the closing mechanism 4 can be prevented from being damaged.

  After the shielding plate 41 contacts the end surface of the insertion port P1, the gantry 44 further moves while compressing the urging member 43 in a state where the shielding plate 41 contacts the end surface of the insertion port P1, and at a predetermined position. Stop. The shielding plate 41 is pressed by the urging member 43 toward the end surface of the insertion port P1, and closes the opening of the insertion port P1 of the tubular body P. At this time, as shown in FIG. 4, the axial direction of the end surface of the tubular body P even when the installation position (position in the axial direction) of the tubular body P is shifted for each of the plurality of tubular bodies P. The displacement of the position can be absorbed by the amount of compression of the urging member 43 varying according to the displacement, and the end surface of the tube P can be reliably closed. In the present embodiment, as shown in FIG. 4, the openings at the ends of the plurality of pipes P arranged in parallel are closed by the plurality of closing mechanisms 4. The body P may be closed by one closing mechanism 4. One installed pipe P may be displaced in the axial position between the pipe that has been painted and the pipe that is installed next. In this case as well, the previously painted pipe And the displacement of the position in the axial direction between the pipe body to be coated next can be absorbed by the urging member 43.

  When the opening of the insertion opening P1 of the tubular body P is closed by the shielding plate 41, coating by the spray gun 31 of the spray device 3 is started. When painting is started, mist-like paint is sprayed from the spray gun 31, but since the opening of the insertion port P1 is closed by the shielding plate 41, the paint is prevented from entering the inside of the insertion port P1. Is done. In particular, when both ends of the tubular body P are not closed, if the tubular body P is moved along the axial direction of the tubular body P (for example, the right side in FIG. 1), the airflow in the direction opposite to the moving direction of the tubular body P (For example, the airflow to the left side in FIG. 1) is generated inside the tube P, and the airflow causes floating mist-like paint to enter the tube P from the opening of the insertion port P1. In the form, since at least one of the ends of the tube P is closed by the shielding plate 41, the air flow is prevented from being generated inside the tube P. Therefore, adhesion of the coating material to the inner surface of the tube P is prevented. Further, the coating is performed while rotating the tube P around the axis by the rotation of the roller 21 of the rotating device 2. At the same time, the carriage C moves in the axial direction of the pipe body P (right side in FIG. 1), and at the same time, the spray gun 31 moves along the guide 32 in the direction opposite to the movement direction of the carriage C (left side in FIG. 1). Moving. At this time, the tube P may move in the axial direction or vibrate in accordance with the rotation of the tube P or the movement of the carriage C. Even in this case, the biasing member 43 is inserted into the insertion opening. As the amount of compression of the urging member 43 varies while being urged toward the end surface of P1, the contact of the shielding plate 41 with the end surface of the insertion port P1 is maintained even during painting, and the invasion of the paint is prevented. Can be prevented.

  Further, as shown in FIGS. 1 and 2, the outer diameter of the shielding plate 41 is larger than the outer diameter of the end portion of the tubular body P, and the shielding plate 41 is moved to the end surface of the tubular body P by the urging force of the urging member 43. Since the opening at the end of the tube body P is closed by pressing against the tube body P, it is easily applied to a plurality of types of tube bodies P without being influenced by the inner diameter of the tube body P or the shape inside the tube body P. Can be applied.

  Further, as shown in FIG. 3, the shielding plate 41 is rotatably provided by the bearing 48 according to the rotation of the tube body P. Therefore, since the shielding plate 41 can rotate following the rotation of the tube P, damage to the end of the tube P due to rubbing between the shielding plate 41 and the end of the tube P is suppressed, The end of the tube body P can be kept in a better state. Moreover, when the contact part 41b of the shielding board 41 is formed with a low friction member, the abrasion and damage by friction are reduced more and the edge part of the tubular body P can be maintained in a better state.

  Painting with the spray gun 31 of the spray device 3 is performed up to the rising portion R of the receiving port P2 of the pipe P, and when the coating is completed, the spray device 3 and the rotating device 2 are stopped. When the rising portion R of the receiving port P2 is painted, the mist-like paint floats around the receiving port P2, but since the insertion port P1 on the opposite side of the receiving port P2 is closed, it is inserted from the receiving port P2. It is possible to prevent the coating material from entering the inside of the tube P without closing the other end by simply closing one end of the tube P without generating an air flow toward the mouth P1. . In the present embodiment, a dust collection mechanism (dust collection duct) 6 that generates an air flow in a direction away from the receiving port P2 (left side in FIG. 1) is provided at a position facing the receiving port P2. Thereby, the floated mist-like paint is discharged in the direction away from the receiving port P2, and the invasion of the paint to the inner surface of the tube P is further prevented. The closing mechanism 4 may be provided at both the insertion port P1 and the receiving port P2 of the tube P. However, by providing the closing mechanism 4 only at one side, the coating material can be applied to the inner surface of the tube P at a low cost. Intrusion can be prevented.

<Second Embodiment>
Next, a second embodiment will be described with reference to FIGS. In the above-described embodiment, the tube P is rotated by the roller 21. However, in the second embodiment, the roller 21 is not provided, and the tube P is sandwiched between a pair of clamp portions. This is different in that the tube P is rotated by the clamp portion. Hereinafter, the second embodiment will be described focusing on the differences.

  As shown in FIG. 5, the outer surface coating apparatus 10 of the present embodiment includes a pair of clamp portions CL <b> 1 and CL <b> 2 that clamp the tube body P from both ends of the tube body P. The pair of clamp portions CL1 and CL2 are configured to be movable toward the end portion of the tubular body P through the pair of clamp portions CL1 and CL2. The pair of clamp parts CL1 and CL2 are configured to be movable in the axial direction of the pipe body P by the moving mechanisms 42a and 42b. In the present embodiment, the moving mechanisms 42a and 42b are configured to be able to move the clamp portions CL1 and CL2 up and down and rotate around the axis.

  The tube P is clamped and lifted by the pair of clamp portions CL1 and CL2 from the insertion port P1 and the receiving port P2 side of the tube P, and then rotated around the axis of the tube P, so that the spray gun of the injection device 3 A mist paint is applied by 31. As shown in FIG. 5, the pair of clamp parts CL1 and CL2 extends along the axial direction of the pipe body P from the bottom part B and the bottom part B facing the end surface of the pipe body P in the present embodiment. It has a cylindrical portion CY that covers the outer periphery of the end portion of the tubular body P when the tubular body P is clamped by CL1 and CL2.

  In the present embodiment, as shown in FIG. 5, a closing mechanism 40 is provided in one clamp part CL1. As shown in FIG. 5, the closing mechanism 40 of the present embodiment includes a shielding plate 41, a moving mechanism 42 a, and an urging member 43. Although the same thing as 1st Embodiment can be used for the shielding board 41, it is preferable to use abrasion-resistant rubber from a viewpoint which clamps the pipe body P reliably and prevents deterioration by abrasion. In the present embodiment, one end of the shaft 45 connected to the shielding plate 41 is fixed to the bottom B of the clamp portion CL1, and the other end of the shaft 45 is fixed to the shaft 45 when the tubular body P is clamped. 45 is attached to be movable in the axial direction. In addition, the closing mechanism 40 may be provided in both the clamp parts CL1 and CL2.

  Further, as shown in FIG. 5, the shielding plate 41 is disposed apart from the bottom B of the clamping portion CL in a state before the tube body P is clamped by the clamping portion CL1, and the shielding plate 41 and the clamping portion CL are arranged. An urging member 43 is provided between the bottom portion B and the bottom portion B. The urging member 43 urges the shielding plate 41 toward the receiving port P2 side of the tubular body P. In the present embodiment, as shown in FIG. 5, the position of the shielding plate 41 in the axial direction is disposed so as to exceed the free end of the cylindrical portion CY of the clamp portion CL <b> 1. The position of is not limited to the position shown in FIG.

  The outer surface coating apparatus 10 of this embodiment clamps the installed pipe P from both sides by driving the moving mechanisms 42a and 42b as shown in FIG. The insertion port P1 side of the tubular body P is clamped by the clamp part CL2, and the receiving port P2 side is clamped by the clamp part CL1. More specifically, the clamp portion CL1 on the receiving port P2 side is attached to the receiving port P2 of the tube body P, and then the clamp portion CL2 on the insertion port P1 side is mounted to clamp the tube body P. At the time of clamping, when the clamp part CL1 moves toward the end surface of the receiving port P2, the shielding plate 41 comes into contact with the end surface of the receiving port P2.

  After the shielding plate 41 abuts on the end surface of the receiving port P2, the clamp portion CL1 further moves while compressing the urging member 43 in a state where the shielding plate 41 abuts on the end surface of the receiving port P2, and the urging member When 43 is compressed to the compression limit (the contracted state shown in FIG. 6), the tube P is clamped by the clamp portions CL1 and CL2, and the tube P is supported by the pair of clamp portions CL1 and CL2. When the tubular body P is supported by the clamp portions CL1 and CL2, the clamp portion CL1 is rotationally driven by the moving mechanism 42a to rotate the tubular body P. Next, coating is performed from the receiving port P2 side to the insertion port P1 side by the injection device 3 while rotating the tube P. When painting is started, mist-like paint is sprayed from the spray gun 31, but since the opening of the receiving port P2 is closed by the shielding plate 41, the paint is prevented from entering the inside of the receiving port P2. Is done.

  In addition, for example, powder paint by applying a plurality of pipes P is attached to the bottom B or the cylindrical part CY of the clamp part CL1, and this powder paint is applied to the clamp part. May peel off when clamped by CL1. In the outer surface coating apparatus 10 of the present embodiment, when the tube P is clamped, the shielding plate 41 is first brought into contact with the end surface of the receiving port P2, and is then clamped, so that it peels off due to the impact applied when the tube P is clamped. Since the paint has already closed the end portion of the tube P by the shielding plate 41 when an impact is applied, the paint can be prevented from entering the receiving port P2. In addition, the tube P is disposed between the pair of clamp portions CL1 and CL2 until the clamp is completed (from the state of FIG. 5 to the state of FIG. 6), and the shielding plate 41 is the receiving port. The urging member 43 causes the shielding plate 41 to receive the receiving port P2 between the state in which the tube P is in contact with the end surface of P2 and the clamp is released from the state in which the tube P is clamped (from the state in FIG. 6 to the state in FIG. 5). Continue to abut against the end face. Therefore, the exposure time in which the opening of the receiving port P2 is not closed when the clamp is attached / detached can be shortened, and the intrusion of the mist-like paint into the inner surface of the tube P can be suppressed.

  Further, since the mist-like paint is floating in the air during the processing of the continuous pipe body P, it is preferable to provide the closing mechanisms 40 on both sides of the pipe body P. In this embodiment, the receiving port P2 is provided. After attaching the clamp part CL1 on the side (closing the opening on the receiving port P2 side), the clamp part CL2 on the insertion port P1 side is installed, and after painting, the clamp part CL2 on the insertion port P1 side is detached and then received. The clamp part CL1 on the side of the mouth P2 is detached. Therefore, when the opening on the insertion port P1 side is open, the opening on the receiving port P2 side is closed, and the mist-like paint generates an air flow from the outside of the opening of the insertion port P1 toward the inside of the tubular body P. Absent. Therefore, by driving the clamp portions CL1 and CL2 as described above, the mist-like paint can be effectively penetrated into the tube P only by providing the closing mechanism 40 only in the clamp portion CL1 on the receiving port P2 side. Therefore, the manufacturing cost can be reduced.

DESCRIPTION OF SYMBOLS 1, 10 Outer surface coating apparatus 2 Rotating apparatus 21 Roller 3 Spraying apparatus 31 Spray gun 32 Guide 4, 40 Closing mechanism 41 Shielding board 41a Shielding board base | substrate 41b Abutting part 42, 42a, 42b Moving mechanism 43 Energizing member 44 Base 45 Shaft 45a Flange 45b Spring seat 46 Height adjustment mechanism 47 Cylindrical body 48 Bearing 5 Support base 51 Guide part 6 Dust collection mechanism B Bottom C Carriage CL1, CL2 Clamping part CY Cylindrical part E Locking part P Tube P1 Insert P2 Receptacle R Rising part

Claims (7)

An outer surface coating apparatus that sprays paint onto the outer surface of a tubular body,
The outer surface coating apparatus is
A closing mechanism for closing an opening at least one end of the tubular body;
The closure mechanism comprises:
A shielding plate capable of covering the opening of at least one end of the tubular body;
A moving mechanism for moving the shielding plate toward an end of the tubular body;
And an urging member that urges the shielding plate toward the end of the tubular body. The outer surface coating apparatus includes a rotating device that rotates the tube body around an axis of the tube body,
The outer surface coating apparatus according to claim 1, wherein the shielding plate is rotatably provided according to the rotation of the tubular body. The closing mechanism is provided on one end side of the tubular body, and a dust collecting mechanism is provided on the other end side of the tubular body to generate an air flow away from the other end portion. The outer surface coating apparatus according to claim 1 or 2. The outer surface coating apparatus is
A pair of clamps for clamping the tube from both ends of the tube;
The pair of clamp parts is configured to be movable toward the end of the tubular body, the pair of clamp parts,
One of the pair of clamp parts is provided with the closing mechanism,
In a state before the tube body is clamped by the clamp portion, the shielding plate is disposed apart from the one clamp portion, and the biasing member is disposed between the shield plate and the one clamp portion. The outer surface coating apparatus according to claim 1, wherein: The shield plate includes a disk-shaped shield plate base and a contact portion attached to the shield plate base and in contact with an end of the tubular body, and the contact portion is formed of a low friction member. The outer surface coating apparatus according to any one of claims 1 to 3. The shield plate includes a disk-shaped shield plate base and a contact portion attached to the shield plate base and in contact with an end portion of the tubular body, and the contact portion is formed of wear-resistant rubber. The external surface coating apparatus of any one of Claims 1-4. An outer surface coating method for coating an outer surface of a tubular body using the outer surface coating apparatus according to any one of claims 1 to 6,
Disposing the tubular body at a predetermined position;
A step of moving the shielding plate toward an end of the arranged tubular body,
A step of bringing the shielding plate into contact with one end portion of the tubular body, pressing the shielding plate toward the end portion by the biasing member, and closing an opening of the end portion of the tubular body; And a coating method comprising a step of spraying paint onto the outer surface of the tubular body while rotating the tubular body about an axis.

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