JPH0329470B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to an ironing coating device for leveling paint to a uniform thickness when manufacturing coated pipes and lined pipes such as double-coated steel pipe piles. It is something.

Conventional technology For example, double-coated steel pipe piles are manufactured by first coating a bituminous material and then coating it with plastic, but since the coating thickness of the bituminous material is relatively thick, about 4 to 6 mm, conventionally was manufactured by the equipment schematically shown in FIG. That is, the steel pipe 1, which is the material to be coated, is run in the axial direction by a feeder 2, and as it passes through the coating device 3, bitumen is poured out onto the outer peripheral surface of the steel pipe 1 from the bitumen discharge port 4 on the inner peripheral side. The bitumen is then squeezed by an ironing ring 6 in an ironing device 5 to level the bitumen to a constant thickness, and then the semi-molten plastic is extruded from an extruder 7 to apply a plastic coating.

Since the ironing device 5 is used to strain the bitumen to a uniform thickness by using the ironing ring 6, it is necessary to maintain the relative position of the ironing ring 6 and the steel pipe 1 properly at all times. In a fixed configuration, if the steel pipe 1 is bent, the relative position between the steel pipe 1 and the squeezing ring 6 will change.
There is an inconvenience that the coating thickness becomes non-uniform around the entire circumference of the steel pipe 1. Conventionally, a device has been proposed, for example, in Japanese Utility Model Publication No. 51-19108, in which the straining ring is supported by a spring so that the straining ring moves vertically and horizontally to follow the bending of the steel pipe.

Furthermore, a surface treatment device for coated steel pipes using ironing plates has been proposed in JP-A-59-142865, which moves the target steel pipe in the axial direction while rotating it. The ironing plates arranged in parallel are brought close to the outer circumferential surface of the steel pipe from the outer circumferential side of the steel pipe, and the distance between the ironing plate and the steel pipe is kept constant by a copying roller that is in contact with the outer circumferential surface of the steel pipe.

Problems to be Solved by the Invention However, in the device proposed in Utility Model Publication No. 51-19108, when the steel pipe is bent, the straining ring may move to some extent to follow the bend in the steel pipe; Since the straining ring is supported by a spring, the elastic force of the spring acts on the straining ring that has moved from the neutral position as a force to return it to the neutral position, and as a result, the straining amount on the outside of the bend is large. There was a problem in that the coating thickness became thinner as the bending progressed, and on the other hand, the amount of squeezing decreased on the inside of the bend, resulting in a thicker coating.

Furthermore, although the device proposed in JP-A No. 59-142865 has copying rollers, this device rotates the steel pipe and runs it in the axial direction. This method cannot be applied to a type of device that moves a material to be coated in the axial direction of the material and squeezes out the paint on the outer circumferential surface of the material.

Furthermore, all of the above devices are devices that level the paint, but the thickness of the paint film is uneven in the coating device that is used as a premise, and the minimum thickness is due to the bending of the steel pipe. If the film thickness is thinner than the following movement range of the scraping plate, there is a problem that the insufficient film thickness cannot be corrected. It requires a completely independent device other than the mechanism using.

In view of the above circumstances, it is an object of the present invention to provide an ironing coating device that can apply a coating material such as bitumen to a uniform thickness on the outer circumferential surface of a material such as a steel pipe even if the material is bent. This is the purpose.

Means for Solving the Problems In order to achieve the above object, the present invention integrates a nozzle member for delivering paint to a material to be coated and a board for scraping and leveling the paint, and also integrates these into one body. It is configured to move following the material to be coated, and more specifically, it includes an ironing plate formed with a through hole through which the material to be coated travels in the axial direction thereof, and an ironing board that moves toward the material to be coated. an annular nozzle member having a discharge port opened at the
They are attached to a floating frame so that they are located on the same axis, and the floating frame is mounted via a ball bearing so that it can move freely in a plane perpendicular to the axis of the material to be coated inserted through the through hole. The floating frame is suspended from above so as to maintain a substantially weightless floating state by being balanced with a balance weight, and further includes a tracing roller that slides into contact with the outer surface of the material to be coated. In addition, at least three copying mechanisms for holding the ironing plate and the nozzle member concentrically with respect to the material to be coated are located on a part of the floating frame opposite to the ironing plate with the nozzle member sandwiched therebetween. , the tracing roller is mounted so as to be located on the front side of the nozzle member in the direction in which the material to be coated travels.

Function In the device of the present invention, since the ironing plate and the nozzle member are arranged integrally on the same axis, by bringing the tracing roller of the copying mechanism into contact with the outer peripheral surface of the material to be coated, the ironing plate can be The center and the center of the nozzle member coincide with the axis of the material to be coated. In this state, the material to be painted is moved in its axial direction, and the nozzle member applies the paint and strokes the paint. If the material to be coated becomes curved during that time, the tracing roller of the copying mechanism is in contact with the outer circumferential surface of the material to be coated, so the copying mechanism and the floating frame to which it is attached will follow the curve of the material to be coated. As a result, the nozzle member and the ironing plate move in the same manner, so that the concentric state of the nozzle member and the ironing plate with the material to be coated is maintained as before. Therefore, since the distance between the discharge port of the nozzle member and the material to be coated and the distance between the ironing board and the material to be coated are kept constant, the thickness of the coating becomes uniform regardless of the curvature of the material to be coated.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is a side view thereof, in which the device shown here has a structure in which a laddering mechanism 10 and a coating mechanism 11 are integrated. . That is, the ironing mechanism 10 includes an ironing plate 1 having a through hole 12 formed in the center.
3 is fixed to the inner circumference of the ironing ring 14, which is an annular disc body, with a mounting bracket 15, and the steel pipe 16, which is the material to be painted, is inserted into the through hole 12 and run By doing so, the paint applied to the outer peripheral surface is leveled off by the ironing board 13. Further, the coating mechanism 11 is mainly composed of an annular nozzle member 17 that covers the outer peripheral surface of the steel pipe 16, and the nozzle member 17 has an annular guide hole 19 inside thereof to which a paint supply hose 18 is connected. and a discharge port 2 that sends out the paint from the guide shaft 19.
0 is formed on the inner periphery, and furthermore, guide plates 21 and 22 are provided at the inner periphery of the nozzle member 17 on both sides of the discharge port 20 in order to set the amount of paint to be applied. ing.

And the above-mentioned ironing mechanism 10 and application mechanism 11
means the through hole 12 of the ironing plate 13 and the nozzle member 17
It is attached to the floating frame 23 so that the two are located on the same axis, and is movable within a plane along the radial direction of the steel pipe 16. That is, the floating frame 23 consists of a cylindrical part 24 and a flange 25 protruding from the outer circumferential surface of the cylindrical part 24, and the above-mentioned squeezing ring is attached to the front end in the running direction of the steel pipe 16 among both the front and rear ends of the cylindrical part 24. 14 is fixed, and the nozzle member 17 is fixed to the opposite end. In this state, of the guide plates 21 and 22, the guide plate 21 on the introduction side of the steel pipe 16 is set so that the distance between it and the steel pipe 16 is as narrow as possible, and the distance between the other guide plate 22 and the steel pipe 16 is set as narrow as possible. The interval is set wider than the interval between the ironing plate 13 and the steel pipe 16. Shigo mechanism 10
The floating frame 23 to which the coating mechanism 11 and the coating mechanism 11 are attached in this way is made of supporting metal fittings that sandwich the flange 25 with ball bearings 26 and that the ball bearings 26 are respectively provided at the corners of a rectangular fixed frame 27. By being attached to 28, it is possible to move freely in the radial direction of the steel pipe 16.

The fixed frame 27 is installed in such a direction that the ironing plate 13 is located in a vertical plane, and two support stands 29 and 30 are lined up along the plate surface direction of the ironing ring 14 at its upper end. A lever 31 is rotatably attached to one support stand 29, and one end of the lever 31 is attached to a hanging rod 3 that passes through the fixed frame 27.
2 to the upper end of the floating frame 23. As shown in FIG. 1, the lever 31 has a protrusion above the support point, and a connecting rod 33 is rotatably attached to the protrusion. A balance weight 34 is suspended.
On the other hand, an L-shaped lever 35 is rotatably attached to the other support stand 30 at its bent portion, and one end thereof is connected to the upper end of the floating frame 23 via a hanging rod 36. and the connecting rod 33 is connected to the other end. Therefore, the floating frame 23, the levers 31, 35, the hanging rods 32, 36, and the connecting rod 33 form a parallel movement mechanism. The balance weight 34 is set to have a weight that is in equilibrium with the floating frame 23 and maintains the floating frame 23 in a floating state in which it appears to be floating in a weightless state.

Furthermore, the floating frame 23 includes:
A copying mechanism 37 is provided to follow the bending of the steel pipe 16 and move. That is, the floating frame 23 is provided with four brackets 38 that protrude further rearward than the coating mechanism 11, and a connecting plate 39 having an L-shaped cross section is attached to each bracket 38. On the surface facing the steel pipe 16, there is a cylinder 40 with a telescope structure in which two cylindrical bodies with a bottom are fitted together.
A compression spring 41 that acts to extend the cylinder 40 is housed inside the compression spring 41, and a head part is installed to adjust the elastic force of the compression spring 41 and, in turn, the length of the cylinder 40. A bolt 43 is provided which is engaged with the cylindrical body on the distal end side, has a threaded distal end protruding from the connecting plate 39, and has a nut 42 screwed into the protruding end. And the steel pipe 1 in the cylinder 40
A trace roller 44 is attached to the end face of the steel pipe 6 through an arm 45 and a bearing 46, and the outer surface of the steel pipe 16 relatively rolls in the axial direction as the steel pipe 16 runs. And these brackets 3
8. A copying mechanism 37 is constituted by a connecting plate 39, a cylinder 40, a compression spring 41, a nut 42, a bolt 43, a trace roller 44, an arm 45, a bearing 46, etc., and thus each has a trace roller 44. The four copying mechanisms 37 are
The trace roller 44 is located in front of the nozzle member 17 in the direction of movement of the material to be coated (to the right in FIGS. 2 and 3).
The floating frame 23 is positioned at
It will be installed on.

Note that the bracket 38 of the copying mechanism 37 is connected to the floating frame 23 and the nozzle member 17.
It is fixed by welding, etc. That is, the position of the copying mechanism 37 is fixed with respect to the floating frame 23 and the nozzle member 17. In this embodiment, there are a total of four copying mechanisms 37 each having a tracing roller 44.
However, at least three or more copying mechanisms 37 may be provided in order to follow in a 360° direction.

Next, the operation of the apparatus configured as described above will be explained. First, by adjusting the amount of tightening of each nut 42 in the copying mechanism 37,
The elastic force of each compression spring 41 acting on the steel pipe 16 is set to be equal when the steel pipe 16 is inserted, so that the steel pipe 16, the ironing plate 13, and the nozzle member 17 are located concentrically. adjust. After making the initial settings in this way, if bituminous material heated and melted at, for example, 90 to 120° C. is supplied to the guide hole 19 of the coating mechanism 11 through the hose 18 while running the steel pipe 16, the bituminous material is is sent out from the discharge port 20 to the outer peripheral surface of the steel pipe 16,
In this case, one guide plate 21 prevents the bituminous material from leaking backward, and the tip side guide plate 22 scrapes the bituminous material on the outer surface of the steel pipe 16. The bituminous substance applied to the outer circumferential surface of the steel pipe 16 in this manner is leveled to a predetermined thickness by the ironing plate 13 as the steel pipe 16 further travels.

The reason why the bituminous material is leveled by the guide plate 22 and then leveled by the ironing plate 13 to a predetermined thickness is as follows. In other words, as the ironing plate 13, a rubber plate with low thermal conductivity is usually used to prevent deterioration of the surface quality due to a rapid temperature drop of the heated bituminous material. If the bituminous material is not supplied to the surface of the material to be coated with a somewhat uniform thickness, the thickness of the bituminous material will not be uniform even after leveling with the ironing board made of the rubber plate due to the stiffness of the rubber plate. Changes may occur. Therefore, in the embodiment, as a step before leveling with the ironing plate 13, preliminary leveling is performed with the guide plate 22 to make the thickness of the bituminous material uniform to some extent, and then as a finishing step, the thickness of the bituminous material is made uniform with the ironing plate 13. Scrape it evenly again. Although not shown in the figure, an opening is formed in the lower part of the cylindrical part 24 of the floating frame 23, through which the excess bitumen material generated by leveling with the ironing board 13 can be removed. teeth,
It is discharged through the opening into a lower tank (not shown).

While applying the coating in this way, the steel pipe 1
6, the trace roller 44 is first pushed to the outside of the bend by the bend. In that case, the squeezing mechanism 10 and the application mechanism 11 are attached to the floating frame 23 together with the copying mechanism 37, and since the floating frame 23 is in a floating state by the balance weight 34, the tracing roller 44 is attached to the steel pipe. 16, the squeezing mechanism 10 and application mechanism 11 move together with the floating frame 23 in the pressing direction, and are maintained concentrically with respect to the curved portion. In other words, the nozzle member 17 follows the bending of the steel pipe 16 and becomes concentric as before, so the coating thickness of the bituminous substance becomes constant and uniform, and the ironing plate 13 follows the bend of the steel pipe 16 and becomes concentric as before. Similarly, since it is concentric with the steel pipe 16, the distance between the ironing plate 13 and the steel pipe 16 is always kept constant, and the ironing plate 13 scrapes the bituminous material to a constant thickness and applies the bituminous material to the steel pipe 16. The thickness can be made uniform.

Furthermore, when the diameter of the target steel pipe 16 changes in the above device, since the tracing roller 44 is held via the cylinder 40 having a telescopic structure, the cylinder 40 of each copying mechanism 37 changes the diameter of the steel pipe 16.
As a result, the trace roller 44 contacts the outer peripheral surface of the steel pipe 16 regardless of its diameter.

In the above embodiments, the case where a bituminous substance is applied to steel pipes has been explained as an example, but the present invention is not limited to the above embodiments, and can be applied to tubular materials or shaft materials other than steel pipes. is the material to be coated,
It can also be applied when using paints other than bituminous substances.

Effects of the Invention As is clear from the above explanation, according to the apparatus of the present invention, the ironing plate and the nozzle member are attached to the floating frame so as to be located on the same axis and are integrated, and the material to be coated is The nozzle member and ironing plate can be moved to follow the bending of the material, and the nozzle member and ironing plate can always be kept concentric with the material to be coated, so the coating thickness and scraping thickness of the paint are constant. Therefore, the thickness of the coating film can be made uniform, and in particular, in the case of this invention, the floating frame, which moves via the tracing mechanism according to the bending of the material to be coated, is made to float in a substantially weightless state. Because it is suspended in
Compared to conventional mechanisms using springs, the operating resistance is significantly lower, and the movement can sensitively follow the bending of the material to be coated. The thickness can be reliably made uniform, thereby improving the product quality of coated pipes and lined pipes such as double-clad pipe piles like never before, and greatly contributing to improving product yield and reducing manufacturing costs. can do.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view showing an embodiment of the present invention, Fig. 2 is a side view thereof, Fig. 3 is an enlarged sectional view taken along the line - - of Fig. 1, and Fig. 4 is a double clad tube. It is an explanatory view showing a manufacturing process. DESCRIPTION OF SYMBOLS 10... Ironing mechanism, 11... Application mechanism, 12... Through hole, 13... Ironing plate, 16... Steel pipe, 17... Nozzle member, 20... Discharge port, 23... Floating frame, 37... Copying mechanism, 44... Trace roller.

Claims (1)

[Claims] 1. An ironing plate having a through hole through which the material to be coated runs in its axial direction and an annular nozzle member having a discharge port opening toward the material to be coated are located on the same axis. the floating frame is attached to a fixed frame via a ball bearing so that the floating frame is movable in a plane perpendicular to the axis of the material to be coated inserted through the through hole;
The floating frame is suspended from above so as to maintain a substantially weightless floating state by being balanced with a balance weight, and further has a tracing roller that comes into sliding contact with the outer surface of the material to be coated, and has a tracing roller that is in sliding contact with the outer surface of the material to be coated. At least three tracing mechanisms for holding the nozzle member concentrically with respect to the material to be coated are arranged on a portion of the floating frame on the opposite side of the ironing plate across the nozzle member, and the tracing roller is arranged on a portion of the floating frame that holds the nozzle member concentrically with respect to the material to be coated. A copying type ironing coating device, characterized in that it is installed so as to be located closer to the front side in the direction of movement of the material to be coated.