JP3543141B2 - Bent resin-coated steel pipe with L-shaped ribs and cold bending method of the steel pipe - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the technical field of a ribbed resin-coated steel pipe having ribs formed integrally with a coating resin adhesively coated on the outer peripheral surface of a thin-walled steel pipe, and more specifically, sliding of a bucket or the like containing components and the like. The present invention relates to a bent resin-coated steel pipe with an L-shaped rib and a method for cold-bending the steel pipe, which are preferably used for rails of a moving table for moving objects.
[0002]
[Prior art]
2. Description of the Related Art In recent years, with regard to rails of a moving table for moving a sliding object such as a bucket storing parts and the like, a sliding surface supporting the sliding object and a fall prevention wall provided vertically at one end of the sliding surface are reduced in cost and assembly work. There is a demand for an integrated type to save time and effort.
[0003]
Therefore, as shown in FIG. 10, a resin-coated steel pipe 2 provided with a rib integrally formed with a coating resin 3 adhesively coated on the outer peripheral surface of the thin steel pipe 2a, wherein the rib is formed of the resin-coated steel pipe. 2 is an L-shaped rib 4 having a flat sliding surface 4a in the horizontal direction of the outer peripheral surface in the cross section, and a vertically falling prevention wall 4b at one end of the sliding surface 4a. Attention has been paid to a resin-coated steel pipe 31 with an L-shaped rib formed in an even cross section.
[0004]
[Problems to be solved by the present invention]
However, at present, the resin-coated steel pipe 31 with an L-shaped rib exists only in a straight shape. Therefore, when the rail of the carriage is formed by the resin-coated steel pipe 31 with the L-shaped rib, variations in the circuit of the sliding object are restricted, and the carriage is not suitable for use on the rail.
[0005]
Therefore, an object of the present invention is to provide a resin-coated steel pipe with an L-shaped rib bent into a curved shape and a steel pipe which can be suitably used for a rail of a moving table for moving a sliding object such as a bucket storing parts and the like. To provide a cold bending method.
[0006]
[Means for Solving the Problems]
As a means for solving the above problems, a resin-coated steel pipe with a bent L-shaped rib according to the invention of claim 1 is provided.
A resin-coated steel pipe with ribs, which is formed integrally with a coating resin adhesively coated on the outer peripheral surface of the thin steel pipe,
The rib is an L-shaped rib having a flat sliding surface in a horizontal direction of an outer peripheral surface in a cross section of the resin-coated steel pipe, and a fall prevention wall vertically rising at one end of the sliding surface. Being formed in a uniform cross section in the axial direction,
The resin-coated steel pipe, wherein the sliding surface maintains a horizontal planar shape, and the fall prevention wall is bent at a curvature suitable for use while maintaining the vertical,
The coating resin forming the sliding surface and the fall prevention wall is made of a high-density polyethylene conductive resin.
[0007]
According to a second aspect of the present invention, in the resin-coated steel pipe with the bent L-shaped rib according to the first aspect, a plurality of short streak-like projections are provided on the sliding surface at a predetermined pitch along the axial direction. It is characterized by being provided.
[0008]
The cold bending method of the resin-coated steel pipe with the L-shaped rib according to the invention according to claim 3 is as follows.
It has a flat sliding surface in the horizontal direction of the outer peripheral surface in the cross section, and at one end of the sliding surface, a fall prevention wall is integrally formed with a coating resin coated with an L-shaped rib vertically upright, and is formed in the axial direction. A method of cold bending a resin-coated steel pipe with an L-shaped rib formed in an uniform cross section by a guide roller receiving a reaction force of a bending action and a pressing roller giving a reaction force of a bending action, with a forming roller as a center,
The bending device includes a forming roller that is driven and rotated in the bending direction of the resin-coated steel pipe, and a guide roller and a push roller that are disposed on the outer periphery of the forming roller and rotate in the traveling direction of the resin-coated steel pipe,
On the outer peripheral surface of the forming roller, a drop prevention wall forming an L-shaped rib in a cross section of the resin-coated steel pipe was arranged so as to be parallel to the rotation axis of the forming roller, and divided by a parallel line along the drop prevention wall. A contour on the forming roller side in a cross section of the resin-coated steel pipe, wherein a first divided face and a second divided face divided by a parallel line passing through the center of the circular pipe portion of the resin-coated steel pipe and parallel to the fall prevention wall are formed. Form a concave groove surface connected by a line,
On the outer peripheral surface of the guide roller and the push roller, a fall prevention wall forming an L-shaped rib in a cross section of the resin-coated steel pipe is arranged so as to be parallel to the rotation axis of the forming roller, and a parallel line along the fall prevention wall is provided. And a fourth divided surface divided by a parallel line passing through the center of the circular pipe portion of the resin-coated steel pipe and parallel to the fall prevention wall, and forming a guide roller in a cross section of the resin-coated steel pipe. And forming a concave groove surface connected by the contour line on the push roller side,
The resin-coated steel pipe is fed between the two concave groove surfaces in such a manner that a fall prevention wall forming an L-shaped rib is parallel to the first division surface of the forming roller and the third division surface of the guide roller. Progress with the rotation of the forming roller,
The resin-coated steel pipe is bent to a desired radius of curvature together with an L-shaped rib by an amount of protrusion of a push roller located in front of the guide roller and driving rotation of a forming roller.
[0009]
Embodiments and Examples of the Invention
1 to 4 show an embodiment of a resin-coated steel pipe with bent L-shaped ribs (hereinafter, may be abbreviated as a bent steel pipe) 1 and 11 described in claim 1. The bent steel pipes 1 and 11 are suitably used, for example, as rails of a moving table 6 for moving a sliding object 5 such as a bucket storing parts and the like.
[0010]
The bent steel pipes 1, 11 are resin-coated steel pipes 2 provided with ribs, which are integrally formed with a coating resin 3 adhesively coated on the outer peripheral surface of a thin steel pipe 2a.
The rib has an L-shaped rib 4 having a flat sliding surface 4a in a horizontal direction of an outer peripheral surface in a cross section of the resin-coated steel pipe 2 and a falling prevention wall 4b vertically rising at one end of the sliding surface 4a. Yes, the cross section is formed in the axial direction uniform cross section,
The resin-coated steel pipe 2 is such that the sliding surface 4a keeps a flat shape in the horizontal direction, and the fall prevention wall 4b keeps vertical, and is bent at a curvature suitable for use;
The coating resin forming the sliding surface 4a and the fall prevention wall 4b is made of a high-density polyethylene conductive resin (the invention according to claim 1).
[0011]
The bent steel pipe 1 shown in FIG. 1A has a configuration in which the radius of curvature of the fall prevention wall 4b is arranged outside the sliding surface 4a, and the bent steel pipe 11 shown in FIG. The configuration is such that the radius of curvature of the fall prevention wall 4b is arranged inside the slide surface 4a. The difference in the arrangement of the fall prevention wall 4b with respect to the sliding surface 4a is that, as shown in FIGS. 3 and 4, the steel pipe 1 ( 1A) and the steel pipe 11 (FIG. 1B) on the inside rail.
[0012]
Incidentally, reference numeral 7 in FIG. 4 indicates an orthogonal joint forming the moving table 6, and reference numeral 8 indicates a frame pipe. The moving table 6 is assembled on a gantry (not shown) having a height suitable for handling the sliding object 5.
[0013]
More specifically, the bent steel pipes 1 and 11 each have a circular cross section having a wall thickness of about 1 mm and an outer diameter of about 26 to 30 mm, and a coating resin 3 made of conductive high-density polyethylene on the outer peripheral surface of the thin steel pipe 2 a. Is formed integrally with a resin-coated steel pipe 2 coated in a thin and uniform layer of about 1 mm with the coated resin 3 to form a sliding surface 4a having a width of about 20 mm and a fall prevention wall 4b having a thickness of about 4 mm and a height of about 10 mm. It has been implemented in the configuration.
[0014]
The size of the bent steel pipes 1 and 11 is not limited to this. Further, the width of the sliding surface 4a of the L-shaped rib 4 is preferably such that the sliding object 5 is supported at both ends and the cost is not increased. Similarly, the height of the fall prevention wall 4b is set so that the sliding object 5 does not fall and the cost does not increase.
[0015]
Regarding the curvature of the curved shape of the bent steel pipes 1 and 11, a steel pipe which is bent to a desired curvature radius by a bending device 10 to be described later is provided in accordance with a designed rail shape of the movable base 6. be able to.
[0016]
Therefore, according to the bent resin-coated steel pipes 1 and 11 with the L-shaped ribs described above, it is possible to assemble the carriage 6 having a circuit having a U-shaped curve as shown in FIG. Further, it is also possible to assemble the movable base 6 having a circuit having an S-shaped curve according to the installation location of the movable base 6. As described above, it is possible to provide the mobile platform 6 having a circuit that flexibly corresponds to the shape of the site where the mobile platform 6 is installed.
[0017]
According to the conductive L-shaped ribbed resin-coated steel pipes 1 and 11, grounding can be performed by connecting a ground wire (not shown) to the resin-coated steel pipes 1 and 11. Even if it is stored and implemented, it is possible to prevent circuit destruction of components and the like related to the same weak current, which is very useful.
[0018]
Furthermore, when the short streak-like projections 9 are provided along the axial direction at a predetermined pitch on the sliding surface 4a of the L-shaped rib 4, the contact area of the sliding object 5 with the sliding surface 4a is reduced as much as possible. As a result, the frictional resistance can be reduced, and the sliding performance of the sliding object 5 can be improved (the invention according to claim 2). Although the streak-like projection 9 in the illustrated example is implemented with a height of 0.25 mm and a radius of 0.25 mm, the size is not limited to this. In the illustrated example, the streaks 9 are provided continuously along the axial direction, but may be provided intermittently at appropriate intervals.
[0019]
5 and 6 show an embodiment of a method for cold bending an L-shaped ribbed resin-coated steel pipe according to claim 3. Specifically, a straight L-shaped resin-coated steel pipe 31 with ribs (hereinafter, sometimes abbreviated as a straight steel pipe) 31 is bent by the bending apparatus 10 into the bent steel pipes 1 and 11 shown in FIGS. The embodiment of the cold bending method in which the fall prevention wall 4b of the L-shaped rib 4 is arranged so as to stand upright at right angles to the curved radius of curvature of the steel pipes 1 and 11 as shown in FIG.
[0020]
The forming roller 36 of the bending device 10 is rotated by the electric motor 12 with a speed reducer at a slow speed (about 10 m per minute) in the direction in which the straight steel pipe 31 advances. The electric motor 12 is fixedly installed on an inverted L-shaped base frame 13.
[0021]
The jack device 14 is installed at a position below a vertical line passing through the center of the rotation shaft of the forming roller 36 and along the vertical front surface of the base frame 13, and is supported on an upper portion of the output shaft of the jack device 14. Two (but not limited to) guide rollers 16a and 16b spaced apart from each other in the direction in which the straight steel pipe 31 is fed forward on the support table 15 by a roller table 16 mounted upward. It is supported horizontally and can be moved up and down by the jack device 14.
[0022]
Further, a push roller 17 for determining the radius of curvature of the curved shape of the steel pipe 31 is supported on the output shaft of the vertical jack device 18 slightly forward of the vertical line in the direction of travel of the steel pipe 31. It is supported so as to be able to move up and down together with the support base 19.
[0023]
As shown in FIGS. 7A and 7B, a drop prevention wall 4b forming an L-shaped rib 4 in a cross section of the straight steel pipe 31 is parallel to the rotation axis of the forming roller 36 on the outer peripheral surface of the forming roller 36. The first divided surfaces 32 and 37 divided by a parallel line along the fall prevention wall 4b, and a parallel line passing through the center of the circular pipe portion of the straight steel pipe 31 and parallel to the fall prevention wall 4b. A concave groove surface 36c is formed by connecting the second divided surfaces 33 and 38 divided by the contour line on the forming roller side in the cross section of the straight steel pipe 31.
[0024]
On the other hand, the outer peripheral surfaces of the guide rollers 16a and 16b and the push roller 17 are also provided with a fall prevention wall 4b which forms an L-shaped rib 4 in the cross section of the straight steel pipe 31 as shown in FIGS. As the arrangement parallel to the rotation axis of the forming roller 36, the fall is performed through the third divided surfaces 34 and 39 divided by parallel lines along the fall prevention wall 4 b and the center of the circular pipe portion of the straight steel pipe 31. A concave shape in which the fourth dividing surfaces 35 and 40 divided by parallel lines parallel to the prevention wall 4b are connected by guide lines 16a and 16b and a contour line on the push roller 17 side in the cross section of the straight steel pipe 31. The groove surfaces 16c and 17c are formed.
[0025]
The guide rollers 16a, 16b and the push roller 17 are free rollers which rotate as the straight steel pipe 31 comes into contact with the guide roller 16a, 16b.
[0026]
Incidentally, the bending device 10 shown in FIGS. 6A and 7A is a device for forming the steel pipe 1 bent to the outside rail of the moving base 6 as shown in FIG. The bending device 10 shown in FIG. 7B is a device for forming the steel pipe 11 bent into the inside rail of the movable base 6 as shown in FIG. 1B.
[0027]
In this embodiment, when starting the bending operation of the straight steel pipe 31, the straight steel pipe 31 is dropped to form the L-shaped rib 4 on the first divided surfaces 32 and 37 of the forming roller 36. In such a manner that the prevention walls 4b are parallel to each other, the paper is fed between the groove surface 36c and the groove surfaces 16c, 17c of the guide rollers 16a, 16b, and advances in the feed direction with the rotation of the forming roller 36.
[0028]
The state (pressure) of sandwiching the linear steel pipe 31 between the forming roller 36 and the guide roller 16 a is appropriately adjusted by the vertical movement of the support base 15 and the roller base 16 by the jack device 14. Further, as shown by a two-dot chain line in FIG. 5, the start position X of the straight steel pipe 31 protrudes to the left of the push roller 17, and is supported by the push roller 17. The jack device 18 moves toward the receiving groove 32 of the forming roller 36, in other words, in the same plane as the concave groove surface 36 c, the amount of protrusion in the vertical direction approaching or far from the rotation center of the forming roller 36 and the driving rotation of the forming roller 36. Thereby, the steel pipe 31 is bent to a desired radius of curvature together with the L-shaped rib 4 with the vertical axis of the rotation axis of the forming roller 36 as a bending start point.
[0029]
By the way, the straight steel pipe 31 is formed by an extruder 21 as shown in FIGS. 9A and 9B. The thin steel pipe 2a is passed through the cross die 22 to the right in the horizontal direction, the adhesive polymer 28 is uniformly applied from the injection port 23, and the coating resin 3 is injected from the resin flow path 24 to adhere to the outer peripheral surface of the thin steel pipe 2a. Cover. Subsequently, while passing through the adapter 25, the first base 26, and the second base 27, the shape of the sliding surface 4a and the fall prevention wall 4b are integrally formed, so that the straight steel pipe 31 is formed. .
[0030]
Therefore, according to the above-described cold bending method of the L-shaped ribbed resin-coated steel pipe according to the present invention, the resin-coated steel pipe 2 of the straight steel pipe 31 maintains the sliding surface 4a in a horizontal plane. In addition, it is possible to provide a resin-coated steel pipe with an L-shaped rib bent at a curvature suitable for use without breaking each original shape while maintaining the fall prevention wall 4b vertical.
[0031]
Also, in the present embodiment, the bending device 10 shown in FIGS. 6 and 7 is implemented in a mode in which the fall prevention wall 4b of the L-shaped rib 4 protrudes to the left. As shown in FIG. B, it is needless to say that the embodiment can be implemented in a mode in which the fall prevention wall 4b projects rightward. Incidentally, the bending device 10 shown in FIG. 8A is a device for forming the steel pipe 1 of the outside rail of the moving table 6 as shown in FIG. 1A, and the bending device 10 shown in FIG. It is an apparatus for forming the steel pipe 11 of the inside rail of the movable base 6 as shown in FIG. 1B.
[0032]
That is, the forming roller 36, the guide rollers 16a, 16b, and the pressing roller 17 of FIGS. 7A and 7B are implemented in a mode in which the fall prevention wall 4b is on the right side, and are selected as necessary.
[0033]
Although the embodiment has been described above with reference to the drawings, the present invention is not limited to the embodiment of the illustrated example, but may be applied to design changes and application variations normally performed by those skilled in the art without departing from the technical idea thereof. Mention is made to include ranges.
[0034]
[Effects of the present invention]
ADVANTAGE OF THE INVENTION According to the resin-coated steel pipe with the bent L-shaped rib and the method for cold bending the steel pipe according to the present invention, the following effects can be obtained.
I) When assembling the movable platform having various types of circuit having a U-shaped or S-shaped curve, the sliding surface and the fall prevention wall are integrated, so that the assembly configuration can be simplified. It is possible to provide an inexpensive mobile platform having a circuit that flexibly responds to the shape of the site where the mobile platform is installed.
II) If conductive coating resin of high-density polyethylene is used, grounding is possible by connecting a ground wire to the resin-coated steel pipe, and even if low-current parts are stored in a sliding object such as a bucket, circuit destruction will occur. Can be prevented.
III) If short streak-like projections are provided on the sliding surface at a predetermined pitch along the axial direction, the contact area of the sliding object with the sliding surface can be reduced as much as possible, and the frictional resistance can be reduced. Sliding performance can be improved.
IV) As described above, in short, the present invention can be suitably used for a rail portion of a movable platform for moving a sliding object such as a bucket containing components related to light electricity.
[Brief description of the drawings]
FIGS. 1A and 1B are perspective views showing bent resin-coated steel pipes with L-shaped ribs.
FIG. 2 is a side end view of the steel pipe shown in FIGS. 1A and 1B.
FIG. 3 is a plan view schematically showing a moving table that supports and moves a sliding object such as a bucket.
FIG. 4A is an enlarged perspective view illustrating a part of the moving table shown in FIG. 3, and FIG. 4B is an end view of the same side.
FIG. 5 is an elevation view showing a main part of the bending device.
6A and 6B are cross-sectional views of the bending apparatus shown in FIG. 5 taken along line 6-6.
7A is a partially enlarged view of FIG. 6A, and FIG. 7B is a partially enlarged view of FIG. 6B.
8A and 8B are partial enlarged views showing different embodiments of the bending device.
FIG. 9A is a sectional view of an essential part showing an apparatus for extruding an L-shaped rib-coated resin-coated steel pipe, and FIG. 9B is a right side view of the same.
FIG. 10 is a perspective view showing a straight resin-coated steel pipe with an L-shaped rib.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 11 Bent resin-coated steel pipe with L-shaped rib 2 Resin-coated steel pipe 3 Resin-coated resin 4 L-shaped rib 4a Sliding surface 4b Fall prevention wall 5 Sliding object 6 Moving table 9 Stripe-like projections 36 Forming rollers 16a, 16b Guide rollers 17 Push roller 10 Bending device 36c Groove surfaces 16c, 17c of forming roller Groove surfaces 32, 37 of guide roller and push roller First division surface 33, 38 Second division surface 34, 39 Third division surface 35, 40 Fourth Division plane

Claims (3)

In a resin-coated steel pipe with ribs, which is formed integrally with a coating resin adhesively coated on the outer peripheral surface of the thin-walled steel pipe,
The rib is an L-shaped rib having a flat slide surface in a horizontal direction of an outer peripheral surface in a cross section of the resin-coated steel pipe, and a fall prevention wall vertically rising at one end of the slide surface. Being formed in a uniform cross section in the axial direction,
The resin-coated steel pipe, wherein the sliding surface maintains a horizontal planar shape, and the fall prevention wall is bent at a curvature suitable for use while maintaining the vertical,
A resin coated steel pipe with bent L-shaped ribs, wherein a conductive resin of high-density polyethylene is used as a coating resin forming the sliding surface and the fall prevention wall. The resin coating with bent L-shaped ribs according to claim 1, wherein a plurality of short streak-like projections are provided on the sliding surface at a predetermined pitch along an axial direction. Steel pipe. It has a flat sliding surface in the horizontal direction of the outer peripheral surface in the cross-section, and at one end of the sliding surface, a fall prevention wall is integrally formed with a coating resin coated with an L-shaped rib vertically erected and in the axial direction. A method of cold bending a resin-coated steel pipe with an L-shaped rib formed in an uniform cross section by a guide roller receiving a reaction force of a bending action and a pressing roller giving a reaction force of a bending action, with a forming roller as a center,
The bending device includes a forming roller that is driven and rotated in the bending direction of the resin-coated steel pipe, and a guide roller and a push roller that are disposed on the outer periphery of the forming roller and rotate in the traveling direction of the resin-coated steel pipe,
On the outer peripheral surface of the forming roller, a drop prevention wall forming an L-shaped rib in a cross section of the resin-coated steel pipe was arranged so as to be parallel to the rotation axis of the forming roller, and divided by a parallel line along the drop prevention wall. A contour on the forming roller side in a cross section of the resin-coated steel pipe, wherein a first divided face and a second divided face divided by a parallel line passing through the center of the circular pipe portion of the resin-coated steel pipe and parallel to the fall prevention wall are formed. Form a concave groove surface connected by a line,
On the outer peripheral surface of the guide roller and the push roller, a fall prevention wall forming an L-shaped rib in a cross section of the resin-coated steel pipe is arranged so as to be parallel to the rotation axis of the forming roller, and a parallel line along the fall prevention wall is provided. And a fourth divided surface divided by a parallel line passing through the center of the circular pipe portion of the resin-coated steel pipe and parallel to the fall prevention wall, and forming a guide roller in a cross section of the resin-coated steel pipe. And forming a concave groove surface connected by the contour line on the push roller side,
The resin-coated steel pipe is fed between the two concave groove surfaces in such a manner that a fall prevention wall forming an L-shaped rib is parallel to the first division surface of the forming roller and the third division surface of the guide roller. Progress with the rotation of the forming roller,
The resin-coated steel pipe with an L-shaped rib is characterized in that the resin-coated steel pipe is bent together with an L-shaped rib to a desired radius of curvature by an amount of protrusion of a push roller located in front of the guide roller and driving rotation of a forming roller. Cold bending method.

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