JPS6358057B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for forming an end of a winding tube.

Metal spirally wound pipes are generally used as sheaths for passing tension members used in the manufacture of prestressed concrete structures, or as pipes for passing air conditioning ducts and cables. Conventionally, most of these spirally wound tubes, excluding those with extremely small diameters, have been of so-called fixed length, and when necessary, they have been connected by a sleeve-shaped joint sheath 2 as shown in Fig. 1. , and the connecting part was being wrapped with tape.

However, with this conventional connection method, a connecting member is required in addition to the tube body, which not only makes the connection work complicated and time-consuming, but also requires a lot of work to wrap tape around the two ends of the joint sheath 2. This required a considerable amount of man-hours.

Therefore, in order to simplify the connection of the winding tubes, the present inventor devised a method of reducing the diameter of one end of the winding tubes to enable fitting connection, as shown in FIG. We have now completed the invention of a method for forming the end of a winding tube and an apparatus for forming the end of a winding tube.

Here, the gist of the present invention is to make one end of a metal winding tube formed with at least a spiral protrusion have an outer diameter corresponding to the inner diameter of the end of the winding tube to be reduced in diameter. The tube end is inserted into a cylindrical core metal and pressed with fluid pressure using a pair of press dies having an approximately semicircular recess with a diameter slightly larger than the outer diameter of the tube end to be reduced in diameter. After forming two creases inclined in the circumferential direction on the outer periphery of the part, pulling back the press die and rotating the winding tube approximately 90 degrees in the circumferential direction, the creases are removed using the press die again. The present invention relates to a method of forming a winding tube end that can be fitted into a winding tube of the same diameter by pressing and folding the winding tube end onto the outer periphery of the winding tube end.

Furthermore, another gist of the present invention is a cylindrical core bar placed horizontally in the center into which the end of the winding tube is inserted, and a press mold driven by fluid pressure that is disposed opposite to the core bar in a direction perpendicular to the core bar. A rotating plate, which is placed on an extension of the core metal and has a through hole for inserting the winding tube in the center, is attached to the fixed frame plate.
It consists of a rotating device that can be freely rotated back and forth within a 90° range, and a tube gripping device fixed to the rotating plate, and the press die has a diameter slightly larger than the outer diameter of the end of the winding tube to be reduced in diameter. Each has a substantially semicircular recess,
Both edges of the concave portion are formed with inclined surfaces that are parallel to each other and inclined outward in the circumferential direction, and are attached to piston rods that are simultaneously driven toward the core metal. It resides in the device.

Next, an example of implementation of the present invention will be explained with reference to the drawings.

FIG. 3 shows the steps from the manufacturing device 6 for the winding tube 1, which performs the molding method according to the present invention, to the winding tube end forming device 20 used in this method.

The winding tube 1, which is formed in a spiral shape and sent out, extends over the guide supports 7 and 8, and when the tip reaches in front of the sensor 9, the feeding is temporarily stopped, and the winding tube is removed by the tube gripping and feeding device 10. 1 is grasped and cut into a predetermined length by the tube cutting device 11.

The cut winding tube 1 is passed through the tube gripping and feeding device 10 as it is, and its tip end is passed through the winding tube end forming device 20.
is moved until it reaches a predetermined position inside. At this time, the winding tube 1 is formed with a spirally continuous protrusion 3 and a caulking portion 4, as shown in FIG. 1 or 2.

According to this method, a cylindrical core bar 22 disposed in a press device 21 of a tube end forming device 20 is inserted into the end of the winding tube 1 formed as described above, and then, as shown in FIG. As shown in FIG.
Pressing is performed from both sides using air pressure using press molds 23 and 23' formed with molds 4 and 24'.

At this time, the radius of the recesses 24, 24' is slightly larger than the outer diameter of the tube end 5 to be reduced in diameter, and the core metal 2
The outer diameter of the tube 2 is slightly smaller than the inner diameter of the tube end 5, that is, the diameter obtained by subtracting approximately twice the tube thickness (the height of the protrusion 3) from the inner diameter of the tube 1. In addition, sloped surfaces 25, 25' and 26, 26', which are inclined in the same circumferential direction, are formed on both edges of the recesses 24, 24', respectively. As shown in Fig. 6, the crease forming space S is approximately twice the thickness of the winding tube 1 (the height of the protrusion 3),
S is provided.

By the above-described first press stroke, two folds 27, 27 inclined in the same direction are formed in the crease forming spaces S, S, as shown in FIG.
At this time, the winding tube 1 is spirally rotated to the right toward the tip, and the folds 27, 27 are inclined in a direction opposite to the spiral direction of the winding tube 1.

Next, the press molds 23, 23' are pulled back and, as shown in FIG. 5, are rotated approximately 90 degrees in the same position by a rotating device 28, which will be described later.
At this time, the winding tube 1 is not held by the tube gripping and feeding device 10, but is held by a tube gripping device 29 fixed to the rotating device 28.

After rotating the winding tube 1, a second press is performed from the state shown in Fig. 5, and the first press is performed as shown in Fig. 6.
Creases 27, 27 formed in the second press process
Crush it and fold it over the outer circumference of the tube. Above 2
The end portion 5 of the winding tube is formed by the pressing process of
As shown in FIG. 2 or FIG. 6, the outer diameters of the folds 27', 27' and the protrusions 3' are slightly smaller than the inner diameter of the winding tube 1.

After the above-mentioned forming process has been completed, the winding tube 1 is released from the grip by the tube gripping device 29 and is gripped by the tube gripping and feeding device 10, and transferred to the winding tube end forming device 2.
After being pulled out from 0 and released from the grip, it is pushed out from above the guide support 8 by the push-out devices 12, 12. All of the steps described above are continuous and automated.

By the method described above, the winding tube end 5 can be freely fitted into the end of the winding tube 1, but the outer diameter is made slightly smaller than the inner diameter of the winding tube 1, and the winding tube 1 Due to the stress on the structure, the molding returns after the molding, resulting in a slightly elliptical shape, and the fitting results in a threaded fit. In other words, by further reducing the outer diameter of the end portion 5 of the winding tube, it is possible to fit smoothly without screwing together, and these can be adjusted as appropriate depending on the shape of the winding tube, plate thickness, etc. It is something that
All of these belong to the technical scope of the present invention.

Next, the winding tube end forming device 20 will be explained in more detail.

As described above, the winding tube end forming device 20 includes a press device 21, a rotating device 28, and a tube gripping device 29.
It is composed of.

The press device 21 includes a mounting frame 30 arranged perpendicularly to the direction in which the guide support 7 extends.
It has a substantially box-shaped molded part 31 installed on the top, and drive parts 32 and 32 arranged opposite to each other on both sides of this molded part 31.

In the molded part 31, a lower guide plate 34 is fixed on a base frame 33 made of a rectangular frame made of angle material, and an upper frame 35 and an upper guide plate are arranged above the base frame 33, facing the base frame 33 and the guide plate 34, respectively. 36 and the back plate 37
and the front frame 38.

At approximately the center of the back plate 37, a cylindrical core metal 22 is arranged horizontally toward the guide plate 7.

The outer circumferential edge of the tip of the core metal 22 is chamfered in a rounded shape, the base is a flange portion 39 with an enlarged diameter, the end thereof is a threaded threaded portion 40, and a threaded hole 42 drilled in the back plate 37 is formed. It is screwed on via a washer 41. In addition, both upper and lower guide plates 3
Reference numerals 6 and 34 form slide grooves 43 and 43 for sliding in a direction perpendicular to the core metal 22, respectively.

Inside the slide grooves 43, 43, the aforementioned press dies 23, 23' are inserted into the core metal 22 in a direction perpendicular to the core metal 22.
They are slidably housed facing each other with 2 at the center.

The press molds 23 and 23' are reciprocated by driving parts 32 and 32 arranged opposite to each other with the core metal 22 at the center.

The drive parts 32, 32 have a cylinder part 45 horizontally fixed via a support frame 44 bolted to the mounting frame 30, and are driven by air pressure extending from the cylinder part 45 toward the core metal 22. The tip of the piston rod 46 and the press die 23 are connected via a joint fitting 47. The joint fitting 47 consists of a male part 48 and a female part 49,
The male part 48 has a fitting part 50 with a hemispherical tip and a cylindrical base part 52 with a thread part 51 formed inside,
A retaining groove 53 is formed on the outer periphery of the fitting portion 50.

The insertion portion 50 of the male portion 48 fits into the female portion 49 .

It has a hemispherical recess 54 and a screw hole 55 corresponding to the retaining groove 53, and has a mounting plate 56 with a bolt hole 57 bored on the distal end side.

Mounting bolts 58, 58... are inserted into screw holes 57a, 57a... bored on the back side of the press molds 23, 23'.
... Attach the female part 49, screw the male part 48 to the threaded part 59 formed at the tip of the piston rod 46,
The female part 49 and the male part 48 are connected to each other by a retaining bolt 60 that projects from the thread hole 55 into the retaining groove 53 and are prevented from coming off.

Rotating device 28 erected in front of the molding section 31
The base plate 6 is welded onto the base 61.
2 has a fixed frame plate 64 and a rotating plate 65 fixed with bolts 63, 63.

A through hole 66 sufficient for the insertion of the winding tube 1 concentric with the core bar 22 is formed in the approximate center of the fixed frame plate 64 having a substantially square shape, and a rotating plate 65 having a substantially donut shape is slidably housed therein. A guide recess 67 is formed and is arranged perpendicular to the extension line of the core bar 22.

Further, a pair of holding bolts 69, 69 that hold the rotating plate 65 are fixed to face each other on the horizontal center line of the guide recess 67.

The rotating plate 65 has a fixed frame plate 64 in the center.
Similarly, a through hole 68 for the insertion of the winding tube 1 is formed concentrically with the core metal 22 and has a smaller diameter than the through hole 66, and an outer hole 68 that is slightly smaller than the outer periphery of the recess 67 is formed on the outer periphery. A step portion 73 having a groove 72 for accommodating bearings 71, 71, . . . is formed inside the peripheral edge portion 70 and the outer peripheral edge portion 70.

Furthermore, a pair of arc-shaped slits 74 , 74 extending approximately 90 degrees are bored approximately midway between the through hole 68 and the outer peripheral edge 70 , and are concentrically opposed to the core bar 22 . , 74 and a holding bolt fixed to the fixed frame plate 64.
is held rotatably within a range of approximately 90°.

Furthermore, near the upper outer periphery of the rotating plate 65, there is an air cylinder 7 whose one end is pivotally connected to a mounting piece 75 and which is arranged parallel to the rotating plate 65.
The tip 78 of the piston rod 77 of 6 is the bolt 79
It is pivotally connected via.

The mounting piece 75 is fixed to a mounting bracket 80 fixed to the mounting frame 30.

The rotating plate 65 rotates through the arc-shaped slits 74 and 74 by reciprocating the piston rod 77 using air pressure.
Rotate within a range of 74 degrees, that is, within a range of approximately 90 degrees.

A tube gripping device 29 is fixed on the opposite side of the rotary plate 65 from the side on which the piston rod 77 is pivoted.

The tube gripping device 29 includes a fixed frame 81 bolted to the rotating plate 65, an air cylinder 82 and a gripping claw 83 attached to the fixed frame 81.
have.

The fixed frame 81 has a substantially L-shaped gripping claw attachment part 8.
4 and a substantially U-shaped cylinder mounting portion 85 below it. Bearing ribs 86, 86 are provided on the mounting portion 84.
are bolted together, and the bearing ribs 86, 86 support both ends of a pin 87, which has one end of a gripping claw 83, 83 having an arc-shaped cross section pivoted in a hinge shape.

The gripping claws 83, 83 have rubber plates 8 on the inside.
8, 88 to prevent slipping, and its gripping surface 8
9 and 89 have approximately the same diameter as the outer diameter of the winding tube 1. The gripping claws 83, 83, which are open on both sides of the pin 87, are reciprocated by the reciprocating movement of the piston rod 91 of the air cylinder 82, which is fixed to the mounting portion 85 with bolts 90, 90. It can be opened and closed about a pin 87 via a pantograph-shaped link 94, with one end pivotally attached to the intro piece 93 and the other end welded and fixed to each gripping claw 83. At this time, the core of the pin 87 and the core of the metal core 22 are arranged on the extension of the axes of the air cylinder 82 and the piston rod 91.

The process of forming the end of the winding tube 1 by the winding tube end forming device 20 configured as described above is as described above, and the press dies 23, 23' are pulled back after the first press forming process. At the same time, the air cylinder 82 is operated to release the grip of the winding tube 1 by the grip claw 83, and then the air cylinder 76 is operated to rotate the rotary plate 65 approximately 90 degrees.

All of these air cylinders are activated automatically by installing a limit switch (not shown), etc., but these air circuits, electric circuits, etc. are based on known technology, and their explanation will be omitted.

In addition, the above-mentioned press device 21 and air cylinder 7
Of course, both the air cylinder 6 and the air cylinder 82 may be hydraulically driven.

The present invention is constructed as described above, and according to the method of forming the end of the winding tube of the present invention, first, two inclined creases are formed on the outer periphery of the winding tube, and the winding tube is roughly shaped as it is.
After rotating 90 degrees, the creases are folded over the outer circumference of the tube using the same press die, so there is no need to change the press die or use high-output fluid pressure, making the process simple. This made it possible to reduce the diameter of the end of the winding tube.

Furthermore, the winding tube end forming device of the present invention includes a press device that simultaneously drives a pair of press dies having parallel sloped surfaces formed on both edges of the recessed portion, centering around a core metal, and a tube gripping device. Since it has a rotating device that rotates it, it is possible to simplify the diameter reduction molding of the end of the winding tube with only two presses using the same press die without moving the winding tube to be formed, and it is possible to omit manpower. Summer.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a winding tube connecting portion showing a conventional winding tube connecting means, FIG. 3 is a plan view for explaining an embodiment of the present invention, and is a plan view showing an outline of a system from a winding tube manufacturing device to a winding tube end manufacturing device directly used in the same embodiment, and FIGS. Fig. 6 is a longitudinal sectional view of the main part for explaining the molding process of the above, Fig. 7 is a longitudinal sectional view taken along the line AA of Fig. 3, and Fig. 8 is a longitudinal sectional view of the same taken along the line B-B of Fig. 3. FIG. 9 is a longitudinal cross-sectional view taken along the line CC. DESCRIPTION OF SYMBOLS 1... Winding tube, 3, 3'... Projection, 4... Caulking part, 5... Winding tube end, 20... Winding tube end forming device, 21... Pressing device, 22... Core metal ,23,
23'...Press mold, 24, 24'...Recess, 2
5, 25', 26, 26'... Inclined surface, 27, 2
7'... Crease, 28... Rotating device, 29... Tube gripping device, 31... Molding section, 32... Drive section, 4
6,71,91... Piston rod, 64... Fixed frame plate, 65... Rotating plate, 68...
Winding tube insertion through hole, 69... Holding bolt, 74...
Arc-shaped slit, 75...Mounting piece, 76, 82
...Air cylinder, 80...Mounting bracket,
81...Fixed frame, 94...Link.

Claims (1)

[Scope of Claims] 1. One end of a metal winding tube formed with at least a spiral protrusion is formed of a cylindrical core metal having an outer diameter corresponding to the inner diameter of the end of the winding tube to be reduced in diameter. Insert it into the
A pair of press molds having an approximately semicircular concave portion with a diameter slightly larger than the outer diameter of the end of the winding tube to be reduced in diameter is used to press it with fluid pressure to make a shape inclined in the circumferential direction on the outer periphery of the end of the winding tube. After forming two creases, pulling back the press die and rotating the winding tube approximately 90 degrees in the circumferential direction, the press die presses the creases again and presses the creases on the outer periphery of the end of the winding tube. A method for forming an end of a winding tube that can be freely fitted into a winding tube of the same diameter, which is characterized by being folded over the ends of the winding tube. 2. A press device having a cylindrical core placed horizontally in the center into which the end of the winding tube is inserted, a press die driven by hydraulic pressure and placed opposite to the core in a direction perpendicular to the core, and an extension of the core. A rotating device comprising a rotating plate arranged on a line and having a through hole for winding tube insertion in the center attached to a fixed frame plate so as to be able to freely rotate back and forth within a range of approximately 90 degrees, and a tube grip fixed to the rotating plate. The press mold has approximately semicircular recesses each having a slightly larger diameter than the outer diameter of the end of the winding tube to be reduced in diameter. What is claimed is: 1. A winding tube end forming device characterized in that the winding tube end forming device forms parallel inclined surfaces and is attached to piston rods that are simultaneously driven toward the core metal. 3. The rotating plate is slidably attached to two opposing arc-shaped slits concentrically drilled and holding bolts fixed to the fixed frame plate, and one end is pivotally connected to the fixed mounting base, 3. The winding tube end forming device according to claim 2, wherein a piston rod tip of a fluid pressure cylinder arranged parallel to said rotary plate is pivotally mounted. 4. The tube gripping device has a gripping claw with an arc-shaped cross section that is open on both sides via a pivot shaft, and one end of the gripping claw is attached to the tip of a piston rod of a fluid pressure cylinder mounted on a fixed frame fixed to the rotating plate. 3. A winding tube end forming device according to claim 2 or 3, characterized in that it can be opened and closed freely via a pantograph-shaped link attached thereto.