JPH0732033Y2 - Straightening device for coiled pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention is a flexible pipe or cable wound in a coil shape or wound on a reel, a drum or the like (in the present specification, these are simply referred to as coil tubes). The present invention relates to a straightening device that is used to straighten or pull out a coiled tube to correct the curling of a coiled tube or the like.

2. Description of the Related Art Conventionally, for example, in order to perform piping work using a gas pipe made of polyethylene, a coil pipe made of polyethylene is stretched into a straight pipe and laid in a long groove excavated on the ground. Since it has a curl, the end tends to curl even when straightened, so when connecting pipes, it is easy to connect the curled pipe ends especially in the groove. There wasn't. Therefore, in the past, when connecting pipes arranged in a groove, in many cases, the end of the pipe was lifted out of the groove, and then a straight pipe was once fusion-bonded to the end of at least one of the pipes. I have been doing this since the first time, but two times of fusion work to interpose a straight pipe in the connection of the pipes (when connecting straight pipes to both ends of the pipe and then connecting the straight pipes, fusion of three times It takes a lot of time and labor for the piping work.
It was inefficient.

Japanese Utility Model Application Laid-Open No. 1-137218 proposes a device in which the above-mentioned problems are solved by rewinding a coiled pipe or the like so that piping work can be performed easily. As shown in FIG. 3, this device comprises a support base 1 on which a coil tube 10 is rotatably mounted and supported, and a curl straightening device 2 provided on one leg 1 ′ of the support base 1, As shown in detail in FIG. 4, the curl curl correction device 2 is rotatably supported by a mounting frame 3 provided integrally with a leg 1 ′, and is parallel to the plane of the drawing by a handle 4 protruding laterally. A crank 5 that rotates around a horizontal axis, a handle 8 that includes a nut 7 that is pivotally supported by an arm 6 that extends above the crank 5, a screw shaft 9 that is screwed into the nut 7, and below the crank 5. A bracket 13 pivotally supported together with a pulley-like fixed roller 12 on an extending arm 11.
And a curl correction which is axially attached to one end of the bracket 13 and pushes up the coil tube 10 between the fixed roller 12 and the guide roller 17 (see FIG. 3) and bends the coil tube in the direction opposite to the curling direction. Roller 14 and a motor 16 for rotating and driving the fixed roller 12 and the roller 14 via a gear transmission device 15.
When the handle 8 is rotated, the screw shaft 9 moves up and down, and the bracket 13 rotates up and down around the point where the bracket 11 and the arm 11 are pivoted, which causes the curl correction roller 14 to move up and down. Then, the pushing amount into the coil tube 10 can be changed to change the upward bending amount of the coil tube 10. Further, when the handle 4 is turned to turn the crank 5, the entire crank is turned. 5 and 5 are inclined in a direction orthogonal to the paper surface.

Japanese Utility Model Laid-Open No. 1-137218 also shows a roller for straightening curl, which is configured as shown in FIG. 3 or 4 so that it can be applied to coil tubes having different diameters.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention further improves a curl correction roller adapted to be applied to coil pipes having different diameters to improve the flatness of the coil pipe when the coil pipe is bent. It is designed to be smaller.

Means for Solving the Problems That is, the curl straightening device of the present invention has one or a plurality of rollers, at least one of which is a driving roller, and is a pulley-shaped roller that is pressed against a coil tube or the like from the side opposite to the curling direction. In a device that is fed out in a state of being bent in a direction opposite to the curling direction, the pulley-shaped roller is formed by a V-shaped groove or an arc-shaped groove at the groove bottom of a concave groove 21 having a semicircular cross section, and is tangential to the concave groove The small groove 22 that intersects with each other is formed, and the angle θ of the V shape with which the small groove is in contact is 70 ± 10 °, which is smaller than the coil tube with the largest diameter among the applicable coil tubes and has the smallest diameter that fits in the small groove. When the outer diameter of a coil tube or the like having a diameter larger than that of the coil tube is D and the length between the intersections of the U-groove and the V-groove is C, these satisfy the following equations. is there.

1 / 2C = Dcos1 / 2θ + α where α is a constant.

Action Large-diameter coil tubes, etc. can be fitted in the concave groove, small-diameter coil tubes, etc. can be fitted in the boundary area between the U-groove and small groove, and smaller-diameter coil tubes, etc. can be fitted in the small groove. It is applied for straightening curl. As shown in Fig. 1, for a coil tube of the maximum applicable diameter (nominal 50), the coil tube etc. is received wider than the point of action X at the time of straightening the curl, so that the pressure receiving area is increased. And the degree of flatness in the vertical direction of the coil tube and the like decreases.

In addition, a coil pipe with a smaller diameter than the maximum diameter coil pipe, etc., and a larger diameter than the minimum diameter coil pipe that fits in the small groove (nominal 3
With respect to 0), the pressure receiving area is widened by increasing the length of the receiving surface diagonally upward from the contact D of the V groove, and the flatness of the nominal 30 in the vertical direction can be reduced.

According to the experiments by the present inventors, the call 50, the call 30, and the call 25
When used to straighten the coil tube, the preferred value with less flatness of the coil tube is θ = 70 ± 10 ° R = 29.5 ± 0.
It was 5 mm and C = 38 ± 1 mm.

EXAMPLE A roller having a sectional shape as shown in FIG. 1, that is, a radius R
Is 29.5 mm, and a U groove 21 for fitting a nominal 50 plastic pipe
At the bottom of the, the groove bottom of the V-shaped groove with θ of 70 ° is an arc with a radius r of 15 mm, and the length C between the intersections of the V-shaped groove and the U-shaped groove 21.
Using a pulley-shaped roller having a small groove 22 of 38 mm, a polyethylene coil tube of nominal size 50, nominal size 30 and nominal size 25 was straightened. As shown in the table below, the results showed that flatness after straightening was hardly observed for plastic pipes of any nominal diameter.

In the figure, X is the nominal 50, Y is the nominal 30 point of action for straightening the plastic tube, a is about 3 mm, b is about 2
mm.

Comparative Example 1 A roller similar to that of the example was used except that θ was set to 90 ° and the V groove was in contact with the U groove 21 (see FIG. 2), and a coil tube having the same nominal diameter as the example was wound. I made a correction. As a result, as shown in the table, some flatness was recognized with the nominal diameter of 30.

Comparative Example 2 A roller similar to that of Comparative Example 1 was used except that θ was set to 120 °, and a coiled tube having the same nominal diameter as that of Example was straightened. The results are called 30, called 25 as shown in the table.
It was very flat.

Comparative Example 3 Using a roller provided with V-grooves having an angle of 40 ° and 60 °, a coiled tube having the same nominal diameter as that of the example was straightened. As shown in the table, the result was 50 with a large flatness.

Effect of the Invention According to the curl straightening device of the present invention, the flatness of the coil tube or the like when the coil tube or the like is bent can be further reduced as described above.

[Brief description of drawings]

FIG. 1 is a diagram showing a size of a groove portion of a roller according to the present invention,
FIG. 2 is a diagram showing the size of the groove portion of the roller in the comparative example, FIG. 3 is a front view of the curl curl correction device, and FIG.
It is a partially expanded front view of a figure. 1 ... Support base, 2 ... Winding straightening device 10 ... Coil tube, 12 ... Fixed roller 14 ... Rolling straightening roller 17 ... Guide roller, 21 ... U groove, 22 ... Small groove

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Hideki Kimura 1-17-1 Chiyo, Hakata-ku, Fukuoka City, Fukuoka Prefecture Seibu Gas Co., Ltd. (72) Toshiya Ishida 1-1-17 Chiyo, Hakata-ku, Fukuoka, Fukuoka Prefecture No. 1 in Seibu Gas Co., Ltd. (56) References Jikkouhei 1-137218 (JP, Y2)

Claims (2)

[Scope of utility model registration request] 1. At least one driving roller, at least one of which is a driving roller, and is bent in a direction opposite to a curling direction by a pulley-shaped roller pressed from a side opposite to a curling direction against a coil tube or the like. In a device which is configured to feed the pulley-shaped roller, the pulley-shaped roller is formed into a U-shaped groove 21 having a semicircular cross section.
From the maximum diameter coiled pipe that fits into the U-shaped groove 21 to the U-shaped groove by forming a small groove 22 whose tangent line intersects with the U-shaped groove. It is designed to fit multiple coil tubes with different diameters, and the angle θ of the V-shaped tangent line that the small groove touches is 70 ± 10 °. The outer diameter of a coil tube or the like having a diameter smaller than that of the coil tube of the maximum diameter and larger than the diameter of the coil tube of the smallest diameter which fits in the small groove is D, and the length between the intersection points where the U groove and the tangent line of the V shape intersect is C. Then, the curl correction device for a coiled tube or the like, characterized in that these satisfy the following equation. 1 / 2C = Dcos1 / 2θ + α where α is a constant. 2. The winding of a coil tube or the like according to claim 1, which is applied to a coil tube of a nominal 50, a nominal 30, a nominal 25 or the like, and an inner diameter R of the U groove 21 is R = 29.5 ± 0.5 mm and C = 38 ± 1 mm. Guse correction device.