JP3217226U - Anti-rust paint spray gun in long pipe - Google Patents

Abstract

An object of the present invention is to provide a long-pipe anticorrosion coating spray gun capable of spraying paint uniformly on the inner surface of a pipe over the entire length of the pipe body. A guide ring 25 is provided on the outer surface of at least the tip of the long handle portion 14 to position the injection port 11a in the square steel tube 15 at the center of the cross section of the tubular body. When spraying the rust preventive agent on the inner surface of the square steel pipe 15 while moving at the same time, the position of the injection port 11a can always be arranged on the axis of the square steel pipe 15. Thereby, a rust preventive agent can be uniformly spray-applied to the inner surface of the square steel pipe 15 over the entire length thereof. [Selection] Figure 1

Description

  The present invention relates to a long-pipe anticorrosion paint spray gun, and more particularly to a long-pipe antirust paint spray gun that sprays paint on the inner surface of a pipe body.

A car carrier is known as a special vehicle that carries various vehicles (commercial vehicles) and transports on the road surface. Car carriers are subject to rusting and repairs at various parts of the car body due to deterioration over time. In this case, although the purchase of a new car is the best, the price of the vehicle is expensive, and in recent years, a renewal (regeneration) technique for car carriers has been developed.
At the time of car carrier regeneration, square steel pipes (tubular bodies) used for car frames and floors are partially replaced according to the degree of corrosion. At the time of this replacement, first, the corroded portion of the square steel pipe is cut with a gas cutter or the like, and the cut portion is flattened with a grinder or the like. After that, a new square steel pipe cut to a necessary length is welded to the cut portion, and finally, a square steel pipe in which new and old products are integrated using, for example, a spray gun for painting described in Patent Document 1. Apply a rust inhibitor (paint) to the outer surface of

The spray gun of patent document 1 has a gun body with a short nozzle. An air hose is communicated with the air introduction part of the grip of the gun body, and the compressed air from the compressor is introduced into the compressed air passage in the gun body through the air valve. The compressed air passage is provided with a thin paint passage through which paint is supplied from an external paint tank.
By the way, in general, when painting the inner surface of a square steel pipe, while gradually pulling out the nozzle inserted into the pipe of the tubular body, the compressed air is ejected from the nozzle at the tip of the nozzle, and the paint The paint is sprayed while drawing the paint from the tip of the flow path.

Japanese Utility Model Publication No. 6-85053

However, in the spray gun of Patent Document 1, since the nozzle is directly connected to the tip of the gun body (because the nozzle is short), it is difficult to insert the nozzle into the tube body. At the time of coating, a new square steel pipe welded to an old square steel pipe was able to apply a rust inhibitor only on the outer surface together with the old square steel pipe. As a result, the inner surface of the tube was not rust-proofed, and there was no way to prevent the progress of rust from the inner surface of the tube.
Of course, it is also conceivable to apply a rust inhibitor to the inner surface of a square steel pipe using a long handle connected to the tip of the gun body and a nozzle attached to the tip of the long handle. However, the overall length of a rectangular steel pipe used for a car carrier frame or floor is generally close to 8 m. For this reason, when a long handle portion having a length corresponding to this is employed, the position of the injection port at the tip of the nozzle in the tube is not stable during spray coating, and there is a possibility that uneven coating of the rust inhibitor may occur on the inner surface of the tube. That is, for example, if the position of the injection port of the long handle tip portion is greatly deviated downward from the center of the cross section within one cross section of the tubular body, the lower surface may not be applied.

  Therefore, as a result of diligent research, the inventor provides these positioning problems by providing a positioning member that positions the position of the injection port in the square steel pipe at the center of the cross section of the square steel pipe on the outer surface of at least the tip of the long handle. Knowing that everything can be solved, I completed this idea.

  That is, an object of the present invention is to provide a long in-pipe anticorrosion coating spray gun capable of spraying paint uniformly on the inner surface of the pipe over the entire length of the pipe body.

  The invention according to claim 1 is characterized in that the long handle portion of the double pipe structure in which the nozzle having the injection port is connected to the tip, and the compressed air passage through which the compressed air flows is formed around the paint passage through which the paint flows, In a long in-pipe anticorrosion paint spray gun that is inserted into the inside of a pipe body to be coated and sprayed onto the inner surface of the pipe body from the nozzle injection port, the paint guided by the compressed air, The long in-pipe anticorrosion coating spray gun is provided with a positioning member for positioning the position of the injection port inside the tubular body at the center of the cross section of the tubular body on the outer surface of at least the tip of the long handle.

The material of the tube is not limited. For example, metal or plastic may be used.
The cross-sectional shape of the tube is arbitrary. For example, it may be a circle, a triangle, or a quadrilateral or more polygon.
As the tubular body, for example, a rectangular steel pipe used for a car carrier frame or floor can be employed. A car carrier is a truck for transporting vehicles, particularly passenger cars and construction vehicles, and is also referred to as an on-vehicle vehicle (carrier car) or a vehicle transporter.
The “center of the cross section of the tube” here refers to the center position (position on the axis) in the cross section orthogonal to the length direction of the tube (internal space, pipe line).

The type and structure of the spray gun are arbitrary as long as the paint guided by the compressed air is applied by spraying from the nozzle outlet.
The type of paint is arbitrary. For example, an undercoating material such as a rust inhibitor and a primer can be employed. In addition, various paints for the main coating may be used.

The structure of the long handle part is that the base end part of the long handle part is attached to the tip of the gun body of the spray gun, the nozzle with the injection port is connected to the tip of the long handle part, and around the paint flow path through which the paint flows. Any double tube structure in which a compressed air passage through which compressed air flows is formed is optional.
The length of the long handle is, for example, 10 cm to 10 m. If the length is less than 10 cm, the long handle does not hang down due to its own weight, and therefore it is almost unnecessary to provide a positioning member on the long handle. If it is 10 m or more, it is difficult for the operator to handle the spray gun. The preferred length of the long handle is 1 m to 5 m. Within this range, there is a need for a positioning member, and the long handle is not so troublesome when the operator handles the spray gun.

The material of the positioning member is arbitrary. For example, various metals and various plastics can be employed.
The shape of the positioning member is arbitrary. For example, a hook shape (for example, a disk shape, a triangular plate shape, a rectangular plate shape) or the like protruding in the radial direction from the outer surface of the long handle portion can be employed. In addition, it may be a rod,
The size of the positioning member is appropriately changed depending on the size of the tube because the position of the injection port in the tube needs to be positioned at the center of the cross section of the tube.
The number of positioning members used is arbitrary. One or two or more may be used.
The attachment position on the outer surface of the long handle portion of the positioning member is arbitrary as long as the distal end portion of the long handle portion is included.
The positioning member may be detachably attached to the outer surface of the long handle or may be fixed. The structure which makes the positioning member detachable is not limited. For example, an attachment member (for example, a bracket or the like) may be fixed to the outer surface of the long handle and a positioning member may be screwed to the attachment member. In addition, an engagement structure of the positioning member with respect to the mounting member, a screwing structure, a latching structure using a hook-and-loop fastener, a latching structure using a spring force, and the like can be employed.

In particular, the invention described in claim 2 is the long pipe internal rust preventive paint spray gun according to claim 1, wherein the positioning member is a hook-shaped guide ring protruding radially from the outer surface of the long handle portion. .
The shape of the guide ring is arbitrary as long as it is a hook shape protruding radially from the outer surface of the long handle.
A plurality of guide rings can be provided. As for a long long handle portion, a ring having the same shape can be arranged not only at the tip portion but also at an intermediate portion that is separated by a predetermined distance.
In addition, a bearing-like roller is provided on a part of the outer periphery of the guide ring to reduce the friction caused by the guide ring sliding on the inner surface of the tube, and the long handle can be moved smoothly in the tube. (Smooth), and the uniformity of coating and work efficiency can be improved.

  According to the long in-pipe anticorrosion paint spray gun according to claim 1, the positioning member for positioning the position of the injection port in the pipe at the center of the cross section of the pipe is provided on the outer surface of at least the tip of the long handle. The position of the nozzle at the tip of the nozzle in the tube can be always arranged on the axis of the tube. Thereby, a coating material can be uniformly spray-applied to the inner surface of the pipe over the entire length of the pipe body.

  In particular, according to the long-pipe anticorrosion paint spray gun according to claim 2, since a saddle-shaped guide ring protruding radially from the outer surface of the long handle portion is employed as the positioning member, it has an inexpensive and simple structure. However, when the long handle is moved and sprayed in the pipe, the position of the injection port can always be arranged on the axis of the pipe, and the paint can be uniformly sprayed over the entire inner circumference of the pipe. Application can be realized. In addition, since the inside of the tube body is partitioned by the guide ring, it is possible to prevent the paint splashed from the inner surface of the tube from scattering toward the gun body side. As a result, it is possible to prevent the outer surface of the long handle portion excluding the tip from being contaminated by this paint, and furthermore, the splashed paint adheres to the inner surface of the tube body on the gun body side from the guide ring, resulting in excessive paint. It is also possible to prevent the occurrence of liquid sag due to application.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view of the use condition containing the one part enlarged view of the anti-rust coating spray gun in a long pipe which concerns on Example 1 of this invention. It is an expansion exploded view of the principal part of the anti-rust coating spray gun in a long pipe concerning Example 1 of this device.

  Embodiments of the present invention will be specifically described below with reference to the drawings. Here, a long-pipe anticorrosion coating spray gun for spraying a rust inhibitor onto the inner surface of each square steel pipe constituting the floor of the car carrier is taken as an example.

  In FIG. 1, reference numeral 10 denotes a long-pipe anticorrosion paint spray gun according to Embodiment 1 of the present invention. This long-pipe antirust paint spray gun 10 has a nozzle 11 having an injection port 11a connected to the tip. A long handle portion 14 having a double-pipe structure in which a compressed air passage 13 through which compressed air flows is formed around a paint passage 12 through which a rust inhibitor (paint) flows is used for the floor of a car carrier that is a coating object. Is inserted into the square steel pipe (tube body) 15 having a square cross section, and the rust inhibitor guided by the compressed air is sprayed from the injection port 11a of the nozzle 11 to the inner surface of the square steel pipe 15 in a hollow cone shape (annular). It is something to apply.

Hereinafter, these components will be specifically described.
The long in-pipe anticorrosion coating spray gun 10 has a pistol type gun main body 18 to which a grip 17 with a trigger 16 is fixed. Inside the gun body 18, a main body side compressed air passage 31 communicated with the compressor via the air hose 19 and a main body side paint flow passage communicated with the paint tank containing the rust preventive agent via the paint hose 20. 32 and an air valve 21 for introducing compressed air from the compressor into the compressed air passage 13 by operating the trigger 16.

A base end portion of a long handle portion 14 having a double tube structure in which a nozzle 11 having an injection port 11 a is connected to the tip is connected to the tip of the gun body 18.
The long handle portion 14 is an elongated member having a length of 4 m, a metal inner tube 22 having a paint flow channel 12 formed therein, a metal outer tube 23 having a compressed air channel 13 formed therein, A metal long needle valve that is inserted into the internal lesion 2 along the axis of the tube 22, has an end disposed in the nozzle 11, and a base end connected to the valve body of the air valve 21. 24.

On the outer surface of the distal end portion of the outer tube 23, a hook-shaped guide projecting radially from the outer surface of the long handle portion 14 in order to position the position of the injection port 11 a in the rectangular steel tube 15 at the center of the cross section of the rectangular steel tube 15. A ring (positioning member) 25 is fixed via an annular bracket 26.
The guide ring 25 is an annular metal plate whose outer diameter is several mm shorter than the length of one side of the square steel pipe 15 and whose inner diameter is larger than the diameter (outer diameter) of the outer pipe 23. A pair of screw holes 25 a are formed at both ends of the guide ring 25.
The annular bracket 26 is an annular metal plate having a smaller diameter than that of the guide ring 25 and having another pair of screw holes 26a formed on both sides thereof. The inner diameter portion of the annular bracket 26 is welded to the outer peripheral surface of the distal end portion of the outer tube 23. Has been. The guide ring 25 and the annular bracket 26 are connected by a pair of screws 27 via corresponding screw holes 25a and 26a. In addition, the guide ring 25 can be suitably changed to the thing according to the size of the square steel pipe 15 inserted by canceling | screwing a screw stop.

  As shown in FIGS. 1 and 2, the nozzle 11 is screwed into the distal end portion of the outer tube 23, and a nozzle cap 28 in which an injection port 11 a is formed at the center portion of the distal end surface, and the internal space of the nozzle cap 28. And a paint nozzle 29 having a diameter smaller than the inner diameter of the nozzle cap 28. Among these, a large number of spiral grooves 30 for generating a spiral airflow are formed on the outer peripheral surface of the tip of the paint nozzle 29 over the entire periphery. Further, the tip end portion of the needle valve 24 that is inserted into and removed from the tip opening 29a of the paint nozzle 29 and adjusts the discharge amount (injection amount) of the rust preventive agent is inserted into the internal space of the paint nozzle 29.

Next, referring to FIG. 1 and FIG. 2, the skeleton such as the floor of the car carrier is constructed at the time of regenerating the car carrier by using the long-pipe antirust paint spray gun 10 according to the first embodiment of the present invention. A method of spray-applying a rust inhibitor on the inner surface of the square steel pipe 15 to be performed will be described.
First, a car carrier reproduction method will be described.
When reproducing a car carrier, first, an acceptance inspection is performed on the accepted car carrier to be reproduced. Here, weigh vehicle weight of car carrier, corrosion of exterior, presence or absence of rust juice, reduced strength of car frame etc., distortion of floor and body, twisting, lifting equipment work test, electrical system deterioration, cincher operation Check the condition of connecting parts, brakes and axles.

Next, the first part replacement and body repair work are performed. Specifically, a load-carrying machine, a wire, and the like disposed on the loading platform are removed from the U-shaped shackle, and then the vehicle body is repaired such as corrosion, cracking, wear, and twisting of the skeleton formed of the square steel pipe 15.
At this time, a portion where the corrosion of the square steel pipe 15 is severe is cut by a gas cutter, and then the cut portion is finished flat by a grinder. Next, a new square steel pipe 15 cut to a necessary length is welded to this cutting site.

Thereafter, the caulking is removed from the car carrier body, and the grease adhering to each part of the car body is removed by a scraper.
Next, stickers, cushion tapes, and anti-slip tapes, particularly adhesives for adhering these to the vehicle body, are removed by heating with a gas burner.
Then, shot blasting is performed on the entire vehicle body. That is, in a large shot blast booth, an abrasive is sprayed on the entire vehicle body by an air compressor to peel off old paint films and putty. Thereby, the substrate of the iron plate is exposed.

Next, an antirust treatment is performed on the entire outer surface of the vehicle body. That is, the rust preventive agent is sprayed on the entire outer surface of the vehicle body by a general spray gun. Specifically, the blasted car carrier is moved to the painting factory, and the side of the car frame of the vehicle body is sanded. After that, lift the car in the booth and apply rust preventive.
Next, an intermediate inspection of the vehicle body is performed. That is, when rust is removed at the upper part of the car frame, floor mesh, skeleton cracks, and blasting, for example, a hole is found in the skeleton, or a portion with poor iron strength is found. Check those parts, and if found, return the car carrier to the body shop.
After that, the car body is repaired for the second time. Here, as a result of the intermediate inspection, repair work such as replacement, reinforcement or removal of parts is performed on the part of the vehicle body in which a defect has been found, depending on the situation.

Next, electrostatic coating by a coating apparatus is performed on the entire outer surface of the vehicle body after the rust prevention treatment. Specifically, in a large booth fully equipped with an aerial work machine, coating is performed by an electrostatic coating device so as to achieve a predetermined coloring.
Next, the assembly work of each part is performed, and after these operations are completed, a loading test of the automobile on the carrier of the car carrier is performed. That is, a vehicle (commercial vehicle) is actually loaded, and an inspection is performed based on a check sheet for completion inspection to check whether there is any abnormality in quality.
Finally, the renewed car carrier is subjected to an exposure test exposed to wind and rain, and finally the vehicle weight of the car carrier is measured.

Next, referring to FIG. 1 and FIG. 2, a new square steel pipe 15 welded to the frame of the cargo bed, which is performed by using this long pipe anticorrosion coating spray gun 10 at the time of the first vehicle body repair work ( The spray coating method of the rust preventive agent on the inner surface having a length of 8 m) will be described.
First, a new square steel pipe 15 is placed horizontally on a work table for painting. Thereafter, one worker grips the grip 17 of the long-pipe anticorrosion paint spray gun 10 and another worker supports the long-end portion 14 in the longitudinal direction and the middle portion, while holding the long handle portion 14 to the rectangular steel pipe. The tube is gradually inserted into the tube through one end opening of 15. Of course, only one worker may perform the insertion work of the long handle portion 14. At this time, since the guide ring 25 is provided around the outer surface of the distal end portion of the long handle portion 14, the long handle portion 14 is maintained in a horizontal state and is moved along the axis of the rectangular steel pipe 15 to the intermediate portion in the pipe. And can move (slide). Thereby, the middle part of the long handle part 14 and the nozzle 11 do not contact the inner surface of the rectangular steel pipe 15, and the nozzle 11 a at the tip of the nozzle 11 is smoothly arranged in the intermediate part in the length direction of the rectangular steel pipe 15. Can do.

  Thereafter, by pulling the trigger 16 while maintaining this state, the air valve 21 of the gun body 18 is opened, and the needle valve 24 is moved rearward to open the tip opening 29a of the paint nozzle 29. Thereby, the compressed air from the compressor flows into the main body side compressed air passage 31 of the gun body 18 and the rust preventive agent in the paint tank flows into the main body side paint passage 32 of the gun body 18. Thereafter, the compressed air passes through the compressed air passage 13 of the long handle 14 and is injected from the injection port 11 a of the nozzle 11. When this compressed air passes through the internal space of the nozzle cap 28, the compressed air passes through a large number of spiral grooves 30 formed on the outer peripheral surface of the coating material nozzle 29 over the entire circumference, thereby forming a spiral airflow. Thereby, compressed air is injected in the shape of a holocone (annular) from the injection port 11a (FIG. 1). Along with the injection of the compressed air, the paint in the paint flow path 12 is guided from the tip opening 29a where the paint nozzle 29 is opened. As a result, the rust preventive agent is sprayed on the inner surface of the square steel pipe 15 as an annular mist.

  Next, an operator sprays a rust inhibitor on the entire inner surface of the half of the square steel pipe 15 while gradually pulling back the long handle 14 while pulling the trigger 16. At this time, since the guide ring 25 is fixed to the outer surface of the distal end portion of the long handle portion 14, the position of the injection port 11a of the nozzle 11 inside the rectangular steel tube 15 is positioned at the cross-sectional center of the rectangular steel tube 15, The position of the injection port 11a inside the square steel pipe 15 is stabilized. Thereby, a rust preventive agent can be uniformly spray-applied to the inner surface of the square steel pipe 15 over the entire length thereof.

Here, as the positioning member, a metal ring guide ring 25 that protrudes in the radial direction from the outer surface of the long handle portion 14 and has an outer diameter that is shorter than the length of one side of the square steel pipe 15 by several millimeters is adopted. Although the structure is simple, the stability of the position of the injection port 11a when the long handle portion 14 is moved and sprayed in the rectangular steel pipe 15 and the uniform spray application of the rust preventive agent over the entire inner surface of the rectangular steel pipe 15 is achieved. In addition, the guide ring 25 substantially completely partitions the inside of the square steel pipe 15 so that the antirust agent splashed from the inner surface of the pipe can be prevented from scattering to the gun body 18 side. As a result, it is possible to prevent the outer surface of the long handle 14 excluding the tip from being soiled by the rust preventive agent, and the rebounded rust preventive agent is a square steel pipe closer to the gun body 18 than the guide ring 25. It is also possible to prevent the occurrence of liquid dripping or the like caused by excessive application of the rust preventive agent by adhering to the inner surface of 15.
Next, after the spray application of the rust inhibitor to the inner surface of one side (half) of the square steel pipe 15 is completed, the same procedure is applied to the inner surface of the other side (the remaining half) of the square steel pipe 15. The rust preventive paint spray gun 10 is used to spray the rust preventive agent.

  This device is useful as a technique for spraying a paint such as a rust inhibitor into a long pipe.

10 Rust prevention spray gun in long pipe,
11 nozzles,
11a injection port,
12 Paint flow path,
13 Compressed air passage,
14 Long handle,
15 Square steel pipe (tube),
25 Guide ring (positioning member).

Claims (2)

A long handle part of a double pipe structure in which a compressed air passage through which compressed air flows is formed around a paint passage through which a paint flows is connected to the tip of a nozzle having an injection port, and the inside of the pipe body that is the object to be painted In a long in-pipe anticorrosive paint spray gun that sprays the paint guided to the compressed air and sprays the inner surface of the pipe body from the injection port of the nozzle,
A long in-pipe anticorrosion paint spray gun provided with a positioning member for positioning the position of the injection port inside the tube at the center of the cross section of the tube on the outer surface of at least the tip of the long handle. 2. The long-pipe anticorrosion paint spray gun according to claim 1, wherein the positioning member is a hook-shaped guide ring that protrudes radially from an outer surface of the long handle portion.

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