JP5461975B2 - Paint spraying device - Google Patents

Description

  The present invention relates to a paint spraying apparatus that paints the inner surface of an existing drain pipe or the like of an apartment or apartment house with paint.

  Galvanized steel pipes are used for drain pipes in condominiums and apartment houses, and when this is used for a certain period of time, rust and foreign matter adhere to the inner surface and the flow of drainage is damaged. In addition, the inner surface of the tube may corrode. In order to cope with such a situation, it is possible to replace the drain pipe with a new one, but this is a large construction, and a great economic burden is imposed. For this reason, in practice, the function of the drain pipe is restored and the life is extended by cleaning the inner surface of the drain pipe and painting it with a resin paint or the like.

  As a paint spraying device used in the painting process, the one disclosed in Patent Document 1 is known. In the paint spraying device, a cylindrical body whose one end face is closed and a plurality of through holes are formed in the peripheral wall portion is provided at the tip of the rotating shaft. By rotating the rotating body, the coating material supplied into the rotating body is sprayed from the through hole by centrifugal force and uniformly applied to the inner surface of the drain pipe. However, since there is no guide frame surrounding the cylinder, a phenomenon occurs in which the cylinder and the inner surface of the drain pipe come into contact with each other at the bend in the drain pipe, and the drain stand main pipe and the drain main pipe are painted continuously. Cannot be used in such cases.

  On the other hand, according to the paint spraying device disclosed in Patent Document 2, a guide body surrounding the cylindrical body is provided to prevent a phenomenon in which the cylindrical body and the inner surface of the drain pipe are in contact with each other at a bent portion in the drain pipe. However, since it is formed of a pair of rods arranged so as to face each other in the diameter direction of the cylindrical body, the paint sprayed from the through hole is hindered by the rods, resulting in unpainted portions.

Japanese Patent No. 4199896 JP 9-151560 A

  An object of the present invention is to provide a paint spraying apparatus that can coat the drainage horizontal main pipe or the inner surface of the drainage pipe connected to the drainage pipe without leaving unpainted parts.

  In order to solve the above-described problem, the paint spraying apparatus of the present invention includes a cylindrical body having one end face on the front end closed and having a plurality of through holes in the peripheral wall portion, and the center of the one end face passing through the inner center of the cylindrical body. A rotating shaft of the fixed electric motor, a base portion on which the electric motor is disposed, a guide member that is disposed at the tip of the cylindrical body and is fixed to the base portion via a coupling portion, and a tip that is fixed to the cylindrical body In the paint spraying apparatus having a paint supply pipe opened inside, a through hole in a region near the one end surface of the through holes of the cylindrical body is a through hole in a region far from the one end surface. Each of the rotating shafts in the region where the through hole on the side close to the one end surface passes and the region where the through hole on the side far from the one end surface passes. With different projection ranges in the front-rear direction That.

  If a plurality of through holes in the circumferential cylindrical wall portion have the same opening area, a large amount of paint may be ejected from the closed through hole near the one end face, and only a small amount of paint may be ejected from the far through hole.

  According to the present invention, by providing the guide body, it is possible to pass through the bent portion in the drain pipe, and the coupling portion that couples the guide body to the base portion passes through the through hole on the side close to one end surface of the cylindrical body. The area of the through hole on the side farther than the through hole on the side closer to the one end surface is set so that the projected area in the front-rear direction is different between the area where the through hole on the far side and the through hole on the far side pass. Has increased. For this reason, since the paint comes to be ejected from any through hole, and the connecting portion prevents the ejection of the through hole in any region location, the drain region does not disturb this in other region locations. The inner surface of can be painted without leaving unpainted.

It is front view explanatory drawing which shows the use condition of the said paint spraying apparatus. It is a perspective view which shows the principal part of the coating material spraying apparatus which concerns on this invention. It is the cross-sectional view front view which expanded and showed a part of FIG. The cylindrical body with which the said paint spraying apparatus is mounted | worn is shown. It is a perspective explanatory view showing a general drain pipe system in an apartment or apartment house. It is a perspective view which shows the modification of the guide frame of the said coating material spraying apparatus.

Embodiments will be described below with reference to the drawings.
As shown in FIG. 1, the paint spraying device includes a base portion 1, a cylindrical body 3, a paint supply pipe 4, a guide body 5, and a coupling portion 13.

  One end of a hose 6 for supplying resin paint is coupled to the neck portion 14. A cable 15 for supplying electric power to the electric motor 2 is inserted inside the hose 6 and has a length of several tens of meters. The paint supply pipe 4 is joined to the neck portion 14 of the hose 6.

  A cover body 7 positioned so as to surround the outer periphery is fixed to the base body 1 in an outer fitting shape. The cover body 7 is a conical cylinder whose diameter increases toward the front f1.

  An electric motor 2 is disposed on the base body 1 and rotates the rotating shaft 16 of the electric motor extended from the base body 1 toward the front f1.

  Details of the cylindrical body 3 are shown in FIG. 4A, the cylindrical body 3 includes a peripheral wall portion 3a and an end surface portion 3b in which one end surface thereof is closed. The end surface portion 3b is located on the front f1 side, the tip end portion of the rotating shaft 16 is inserted into the center hole of the end surface portion, and the rotating shaft 16 is fastened by fastening the end surface portion 3b and the rotating shaft 16 with a screw structure. And fixed concentrically. A large number of through holes 8a, 8b, and 8c are formed in the peripheral wall portion 3a, and the through holes 8a and 8b in the region a1 on the front f1 side near the end surface portion 3b of these through holes 8a, 8b, and 8c are end surfaces. It has an opening area smaller than the through-hole 8c in the rear side region far from the portion 3b.

  The cylindrical body 3 is made of a synthetic resin material, the length in the front-rear direction f0 is 30 to 40 mm, the diameter of the outer peripheral surface is 40 to 50 mm, and the wall thickness of the peripheral wall portion is 3 to 5 mm. In the region a1 on the front f1 side, eight circular through holes 8a and 8b having a circular cross-section and a center line aligned with the radial direction of the cylindrical body 3 are provided in the circumferential direction in each of the two front and rear circumferential positions. Are formed at equal intervals.

  On the other hand, the rear region a2 has a rectangular shape with a long cross section in the front-rear direction f0 in the circumferential direction, and the rotation axis as the center line b1 moves outward in the radial direction of the cylindrical body 3 as shown in FIG. Six to ten through holes 8c inclined so as to be biased toward the rear side of the sixteen rotation directions c1 are formed at equal intervals in the circumferential direction. And the opening area of each through-hole 8c is several times (for example, 5 times-10 times) of the previous one through-hole 8a, 8b. The angle between the tangent to the circle d2 representing the outer shape of the cross section of the outer peripheral surface of the cylindrical body and the center line b1 is about 30 to 60 degrees.

  In FIG. 3, the paint supply pipe 4 is formed of a hard material such as metal or synthetic resin, and reaches the inside of the cylindrical body 3 after passing through the inside of the base portion 1. The tip 4 a of the paint supply pipe 4 is opened with the front end facing the end surface portion 3 b of the cylindrical body 3.

  The guide body 5 is an annular body that surrounds the outer periphery of the tip of the cylindrical body 3. The guide body 5 is fixed to the base portion 1 by a connecting portion 13 having a length in the range of 80 mm to 90 mm in the front-rear direction f0. The coupling portion 13 includes a plurality of annular members 13a and 13b including at least two or more annular members 13a and 13b disposed along a radial surface of the cylindrical body 3 at a plurality of spaced positions on the center line b2 of the cylindrical body 3 and the guide body 5. Further, of these annular members 13a and 13b, beams 13d and 13e that couple the pair of adjacent ones in the front-rear direction f0 are formed.

  The beams 13d and 13e are formed so that their projection ranges differ when projected onto the guide body 5 in the front-rear direction f0 of the rotation shaft 16. In the present embodiment, as shown in FIG. 2, the respective locations in the longitudinal direction of the respective beams 13 d and 13 e are located in a state shifted by 90 degrees in the circumferential direction of the cylindrical body 3.

  Next, an example of handling when the above-described paint spraying device is used for a drainage pipe system of an apartment or an apartment will be described.

  FIG. 5 shows drainage pipe systems of apartments and apartment houses. In this figure, 9 is a drainage main pipe that passes through each floor of the building, and 10 is a drainage horizontal main pipe that is connected to the drainage stand main pipe 9 in a straight line through a connecting portion 11 bent in an arc shape. The drainage stand main pipe 9, the drainage horizontal main pipe 10, and the connecting portion 11 are all assumed to have a nominal diameter of 100A. In addition, 12 is a branch pipe which connected the sink 14 of each floor, and the branch part 9a of the drain stand main pipe 9.

  When the above-described drainage horizontal main pipe 10 and drainage stand main pipe 9 are continuously coated, first, the inner surfaces of the main pipes 9 and 10 and the connecting portion 11 are first cleaned and dried with hot air or the like. Thereafter, the operator inserts the paint spraying device in this order into the drainage stand main pipe 9, the connecting portion 11, and the drainage horizontal main pipe 10 in the vicinity of the upper end of the drainage stand main pipe 9 that is temporarily opened.

  Next, the operator supplies power to the electric motor 2 via the cable 15 to start the electric motor 2. The resin paint is pumped at an appropriate flow rate into the rotating cylindrical body 3 from the outside of the drain pipe system through the hose 6 and the paint supply pipe 4.

  FIG. 3 shows a state in which the resin coating sprayed from the through holes 8a, 8b and 8c of the cylindrical body 3 is applied to the inner surface of the drainage main pipe 9 so as to gradually become thick, and a coating layer h1 is formed. ing. The resin paint thus pumped in contact with the inner surface of the end surface portion 3b in the cylindrical body 3 and is guided to the outer side in the radial direction by the centrifugal force caused by the rotation, and further ejected from the through holes 8a and 8b. No paint flows as shown by arrow g2. The resin paint is sprayed radially through the through holes 8a and 8b in the area a1 on the front f1 side. On the other hand, since the flow rate of the resin paint supplied from the paint supply pipe 4 into the cylindrical body 3 is larger than the injection amount from the opening area of the through holes 8a and 8b, the resin paint passes through the area a1 on the front f1 side. Then, it reaches the through hole 8c in the rear side region a2 and is ejected.

  The through hole 8c in the rear region a2 has a larger opening area than the through holes 8a and 8b, and the resin coating that reaches the rear region a2 without being ejected from the through holes 8a and 8b is formed in the cylindrical body 3. It is large enough to squirt out so that it does not overflow from the rear end.

  Further, since the center line b1 is appropriately inclined, a wind effect occurs, and an air flow that flows from the inside of the cylindrical body 3 to the outside in the through hole 8c is generated. The overflow is further suppressed. If this air flow is made to flow through the electric motor 2, it also contributes to cooling the electric motor 2.

  Under such a state that the coating process is performed by ejecting the resin paint from the through hole 8c, the operator winds up the hose 6 and moves it back in the drainage horizontal main pipe 10 to the upstream side thereof. By appropriately controlling the pulling movement speed and the supply of the resin paint into the cylindrical body 3, the inner surface of the drainage horizontal main pipe 10 is continuously coated.

  The resin paint sprayed from the through holes 8a, 8b, 8c of the cylindrical body 3 is sprayed radially from the entire periphery of the peripheral wall portion 3a of the cylindrical body 3 during the coating process by the pull back movement of the paint spraying device. Since there is a beam 13d that exists along the front-rear direction f0 between the annular members 13a and 13b, the resin coating cannot be blocked from reaching the inner surface of the drain pipe 10 within the range in which the beam 13d exists. A shadow area is formed temporarily. However, when the paint spraying device is pulled and moved by the length of the beam 13d, there is no beam between the guide body 5 and the annular member 13a having the same area as the shadow area as the shadow area. For this reason, the resin paint radiated from between the guide body 5 and the annular member 13a is sprayed and applied to the shadow area. On the other hand, a beam 13e exists between the guide body 5 and the annular member 13a, and another shadow region is newly formed by the beam 13e, but this other shadow region is the leading side. The resin paint radiated through the through-hole 8c is already sprayed and applied. Therefore, the entire inner surface of the drainage pipe horizontal main pipe 10 after the paint spraying device passes is painted without being left behind.

  Returning to FIG. 5, the coating process proceeds, and the paint spraying device reaches the arcuate bend path of the connecting portion 11 where the drainage horizontal main pipe 10 moves to the drainage standing main pipe 9. At this time, when the guide body 5 is not present, the cylindrical body 3 and the inner surface of the curved passage come into contact with each other. The presence of the guide body 5 prevents such a situation from occurring, and the cylindrical body 3 can continue to rotate even in the arcuate curved path.

  After the paint spraying device passes through the connecting portion 11 and reaches the inside of the drainage main pipe 9, the paint spraying device is suspended in a vertical posture by the hose 6. Along with the upward pulling movement, the inner surface of the drainage main pipe 9 after the paint spraying device passes is painted.

Next, a modified example of the guide beam 13 will be described.
As shown in FIG. 6A, the guide body 5 and the annular member 13b are coupled by a pair of beams 13f. The beam member 13f is configured to be inclined by the angle θ1 with respect to the front-rear direction f0 over the entire length of the range between the guide body 5 and the annular member 13b.

  Further, as shown in FIG. 6B, between the guide body 5 and the annular members 13a and 13b, between each pair of annular members adjacent in the front-rear direction (between the guide body 5 and the annular member 13a, the annular member 13a and the annular member 13b). Are coupled with the beams 13f1 and 13f2 made of rod-shaped bodies, the beams 13f1 and 13f2 are inclined with respect to the front-rear direction f0 as in the case of FIG. 6A. Further, the beams 13f1 and 13f2 are arranged so that the projection ranges are different from each other when projected onto the guide body 5 in the front-rear direction f0.

  6A and 6B as described above, the radiation of the resin paint sprayed from the through holes 8a, 8b, 8c of the cylindrical body 3 is blocked by the beams 13f, 13f1, 13f2, and the drain pipes. A situation where a shadow area where no resin paint is applied to the inner surface of the drain pipe is formed on the inner surface of the drain pipe after passing through the paint spraying device is avoided.

DESCRIPTION OF SYMBOLS 1 Base part 2 Electric motor 3a Peripheral wall part 3 Cylindrical body 4 Paint supply pipe 5 Guide body 8a Through-hole 8b Through-hole 8c Through-hole 9 Drainage main pipe 10 Drainage horizontal main pipe 13 Joint part 13a, 13b Annular member 13d, 13e Beam 14 Neck Part 16 Rotation axis a1 area a2 area b1 center line c1 rotation direction f0 front-rear direction f1 front

Claims (4)

A cylindrical body whose one end surface on the front end side is closed and has a plurality of through holes in the peripheral wall portion, a rotating shaft of an electric motor passing through the inner center of the cylindrical body and fixed to the center of the one end surface, and the electric motor are arranged A coating material spraying device including: a base body portion; a guide body disposed at a distal end of the cylindrical body and fixed to the base body portion via a coupling portion; and a coating material supply pipe having a distal end opened inside the cylindrical body. In
The through hole in the region near the one end surface of the through hole of the cylindrical body has an opening area smaller than the through hole in the region far from the one end surface,
The coupling portion has different projection ranges in the front-rear direction of the rotation shafts in a region where the through hole on the side close to the one end surface passes and a region where the through hole on the side far from the one end surface passes. A paint spraying device characterized by:   The through hole in the region far from the one end face is inclined so that its center line is biased to the rear side in the rotation direction of the rotation shaft as it moves outward in the radial direction of the cylindrical body. The paint spraying device according to claim 1.   An intermediate annular member is further provided between a region portion through which the near-side through hole passes and a region portion through which the far-side through hole passes, and the coupling portion is coupled to the guide body and the intermediate annular member; The paint spraying device according to claim 1, further comprising a portion for joining the intermediate annular member and the base portion. The paint spraying device according to claim 1, wherein the guide body is an annular body surrounding a tip of the cylindrical body.