JP3201440B2 - Branch pipe edge bending device for T-type connecting pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for automatically bending an edge of a branch pipe when the branch pipe is connected to the side of a main pipe in a T-shape.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 6, there is a T-shaped connecting pipe in which a branch pipe 2 is connected in a T-shape on the side of a main pipe 1 formed by bending a galvanized steel plate, as in a duct. As shown in FIG. 7, a circular hole 3 is opened, and the edge 4 of the branch pipe 2 forms a bent portion 5, which is spot welded or riveted to the main pipe 1 and connected to a T-shape. I have.

In this case, the bent portion 5 of the edge 4 of the branch pipe 2 is folded.
The bending angle depends on the combination of the pipe diameters of the main pipe 1 and the branch pipe 2.
It will be different. In particular, the edge 4 of the branch pipe 2 changes in a COS curve as shown in FIG. 8, and the junction with the main pipe 1 at the highest points A and C becomes oblique. A)
Fold it diagonally as shown. Further, since the axial direction of the joint portion with the main pipe 1 at the lowest points B and D is orthogonal, the bent portion 5 is bent at a right angle as shown in FIG. 9B. For this reason, it was difficult to cope with the edge bending work of the branch pipe 2 with a dedicated bending device according to the diameter of the main pipe 1 and the branch pipe 2.

Therefore, conventionally, after the edge 4 of the branch pipe 2 is cut along a COS curve in accordance with the main pipe 1, the bent portion 5 is formed by applying an anvil to the edge 4 and manually registering it with a hammer. Since the processing is performed while correcting the bending and the main pipe 1, there is a problem that skill is required and workability is poor.

[0005]

SUMMARY OF THE INVENTION The present invention eliminates the above-mentioned drawbacks, and automatically bends a bent portion at an edge portion of a branch pipe at an optimum angle in accordance with a pipe diameter of a main pipe and a branch pipe. Thus, a branch pipe edge bending device for a T-shaped connecting pipe with improved workability is provided.

[0006]

The invention of claim 1, wherein the present invention SUMMARY OF] has a branch pipe turntable rotatably provided on the base, is provided above the branch pipe rotary table, the branch pipe
A support rod that reciprocates twice in the radial direction in the range of the radius of the branch pipe in synchronism with the rotation of the turntable once, and one end of the support rod is rotatably connected to the support rod and corresponds to the radius of the main pipe. A lever having a length, an edge bending roller fixed to the other end of the lever, and a guide column for vertically guiding the edge bending roller along the bent portion of the branch pipe. Things.

According to a second aspect of the present invention, there is provided a support rod.
However, the branch pipe diameter setting cam and the branch pipe diameter setting cam
A pin is slidably fitted to the pin to set the branch pipe diameter.
A cam that follows the lateral movement of the pin due to the rotation of the constant cam
Connected to a power conversion mechanism composed of a ring and a branch pipe
The connecting rod is reciprocated within the range of the radius .

[0008]

The branch pipe edge bending apparatus for a T-type connecting pipe according to the present invention adjusts the length of a lever having one end connected to a support rod in accordance with the radius of the main pipe, and branches the range in which the support rod reciprocates. Set to the length of the radius of the pipe. Further, a cylindrical branch pipe whose edge is cut by a COS curve is set on a branch pipe rotating table, and the edge of the branch pipe is clamped by an edge bending roller. Thereafter, by rotating the branch pipe rotating table and reciprocating the support rod in synchronization with this, the tip of the lever rotatably attached to the tip of the support rod also reciprocates. Since the edge bending roller attached to the guide cannot be moved in the horizontal direction but descends along the guide column, the lever rotates up and down about the connecting portion as a fulcrum.

As a result, the edge bending roller fixed to the lever is also inclined, and the edge of the branch pipe is bent here. The support rod reciprocates twice in the radial direction within the range of the radius of the branch pipe in synchronization with one rotation of the branch pipe rotating table. Accordingly, the lever also rotates up and down twice and is mounted here. The edge bending roller moves up and down while changing the angle to automatically form a bent portion at an optimum angle along the curve of the edge of the branch pipe.

Further, in accordance with the present invention, the branch pipe diameter setting cam rotates at twice the rotation angle of the branch pipe rotary table in synchronization with the rotation of the branch pipe rotary table on which the branch pipe is set, and the power conversion. The mechanism converts the rotational force of the cam to reciprocate the connecting rod within the radius of the branch pipe. By reciprocating the connecting rod, the lever connected thereto is rotated to move the edge bending roller up and down while changing the angle.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to FIGS. In the figure, reference numeral 6 denotes a base, on which a gear box 7 is provided, on which a branch pipe rotating table 8 is rotatably provided. Reference numeral 9 denotes a gear box on which a disc-shaped branch pipe diameter setting cam 10 is rotatably provided. Reference numeral 11 denotes a motor with a continuously variable transmission. Pulleys 13a and 14a are mounted on a shaft 12 connected to the output shaft, and a pulley 13a mounted in the middle is movably mounted in the axial direction.

As shown in FIG. 4, the pulley 13a is connected to the pulley 13b of the gear box 9 by a belt 15, and the pulley 14a is connected to the pulley 14b of the gear box 7 by a belt 15. The reduction ratio of the gearbox 7 is set to half that of the gearbox 9, and the branch pipe diameter setting cam 10 is
It is designed to rotate at twice the rotation angle.

The gear box 7 is mounted on a slide table 17 as shown in FIG. 1, and can be moved left and right on the slide table 17 by rotating a handle 18. Further, the gear box 9 is mounted on a slide table 19, and can be moved left and right on the slide table 19 by rotating the handle 18. On the upper surface of the branch pipe diameter setting cam 10, a plurality of round grooves (not shown) are formed at predetermined intervals in the radial direction, and one round groove provided in a half length of the radius r of the branch pipe 2 has a cylindrical shape. The pins 20 are detachably fitted and project from the upper surface.

A support rod 22 is provided horizontally above the branch pipe diameter setting cam 10, and is slidably mounted on a rod mounting portion 23 as shown in FIG. This support rod
A cam ring 25 is connected to the lower part of the cam 22. The cam ring 25 is formed in an oval ring shape as shown in FIG. At the same time, the cam ring 25 moves following the lateral movement of the pin 20 due to the rotation of the branch pipe diameter setting cam 10, and the support rod 22 connected thereto reciprocates within the radius r of the branch pipe 2. A power conversion mechanism 26 is configured.

As shown in FIG. 1, a handle 18 is provided at the tip of a support rod 22 located above the branch pipe rotating table 8.
Are mounted vertically, and a lever mounting plate 30 in which a plurality of connection holes 29 are formed is supported movably up and down. Reference numeral 32 denotes a lever, which has a plurality of connecting holes 33 formed along the longitudinal direction thereof, and an edge bending roller 35 is fixed to one end of the lever 32. Is set to be equal to the radius R of the main pipe 1 and is rotatably connected to the connection hole 29 of the lever mounting plate 30 by a pin.

As shown in FIG. 5, the edge bending roller 35 is provided with a rotating roller 37 and a fixed roller 38 on an elevating bracket 36 connected to the lever 32. The rotating roller 37 is supported by a bearing 40 attached to a cylinder 39, and a pulley 41a is attached to an end. Also cylinder 39
A motor 42 is connected to the upper part of the motor, and a pulley 41b attached to the motor 42 is a belt 15,
Is connected to the pulley 41a.

As shown in FIG. 3, the elevating bracket 36 has a U-shape in plan view, and guides 44, 44 are connected to both ends thereof, and the guides 44, 44 are guided by guide posts 45, 45 so as to move up and down. It works. The guide portion 44 is connected to one end of a chain 46 as shown in FIG. 1, and a weight 47 is connected to the other end. The chain 46 is supported by a sprocket 48 provided above a guide column 45.

The case where the branch pipe 2 is bent by the above-described apparatus will be described . First, as shown in FIG.
Adjust the length of the lever 32 according to the radius R, and
As shown in FIG.
The cylindrical groove is provided at a predetermined interval on the upper surface of the
A pin 20 is projected, and the upper side of this pin 20 is
To fit inside. In this case, the mounting position of pin 20
Is a half of the radius r of the branch pipe 2 from the center of the branch pipe diameter setting cam 10.
Attached to the round groove formed at the position of the minute length
You. Next, the cylindrical branch pipe 2 whose edge 4 is aligned with the circular hole 3 of the main pipe 1 and cut by the COS curve is set on the branch pipe rotating table 8. First, when bending from the highest portion A of the branch pipe 2, the lever 32 is set to be horizontal as shown in FIG. Position. Here, the edge 4 is provided between the fixed roller 38 and the rotating roller 37 as shown in FIG.
The cylinder 39 is actuated so as to be held between the rollers.

Then, as shown in FIG. 1, when the motor 11 and the motor 42 are switched on, the shaft 12
The rotation of the pulleys 13a and 13b is transmitted to the gearbox 9 via the belt 15, and the branch pipe diameter setting cam 10 rotates. On the other hand, pulleys 14a, 14 attached to the shaft 12
The b also rotates as shown in FIG. 4 and is transmitted to the gear box 7, and the branch pipe rotating table 8 connected thereto rotates.

When the branch pipe 2 set on the branch pipe rotating table 8 starts rotating, the motor 42 turns the edge bending roller.
35 also rotates, and the point A of the edge 4 is bent as shown in FIG. The branch pipe diameter setting cam 10 also rotates in synchronization with the rotation of the branch pipe rotation table 8, but the reduction ratio of the gear box 7 is set to half that of the gear box 9, and the branch pipe diameter setting cam 10 is moved to the branch pipe rotation table. 8 so that it rotates at twice this rotation angle,
In the middle portion where the edge 4 of the branch pipe 2 where is located is rotated 45 degrees from the point A to the point B, as shown in FIG.
Is rotated by 90 degrees, and the support rod 22 engaged with the pin 20 by the cam ring 25 moves to the right side in the drawing by half the radius r of the branch pipe 2.

For this reason, the lever mounting plate 30 mounted on the distal end of the support rod 22 and the distal end of the lever 32 rotatably connected thereto also move. Edge bending roller 35 attached to lever 32
Is supported by the lifting bracket 36 and cannot move in the horizontal direction, but descends along the guide post 45, so that the lever 32
Pivots downward about the connecting portion of the lever mounting plate 30 as a fulcrum. As a result, the edge bending roller 35 connected to the lever 32 is also inclined, and the edge 4 sandwiched between the rotating roller 37 and the fixed roller 38 is bent at a large angle.

Further, when the branch pipe 2 set on the branch pipe rotating table 8 rotates 90 degrees from the point A to the point B, the branch pipe diameter setting cam
10 rotates 180 degrees and pin 20 reaches the position shown by the phantom line in FIG. At this time, the support rod 22 reaches the limit,
The lever 32 rotates 90 degrees to coincide with the lever mounting plate 30, and the edge bending roller 35 becomes horizontal as shown by the imaginary line. At this time, the edge 4 sandwiched between the rotating roller 37 and the fixed roller 38 of the horizontal edge bending roller 35 as shown in FIG. 5 is bent at a right angle as shown in FIG. 9B.

Thereafter, when the branch pipe rotating table 8 rotates and the branch pipe 2 rotates from the point B to the point C, the lever 32 rotates upward and the edge bending roller 35 moves as shown by a solid line in FIG. Returns to the initial state. Thereafter, while the branch pipe 2 returns to the point A from the point C via the point D, the support rod 22 reciprocates once left and right, and accordingly, the edge bending roller 35 also moves up and down once, and The bent portion 5 having the optimum angle is automatically formed over the entire circumference of the tube 2.

When the sizes of the main pipe 1 and the branch pipe 2 to be connected are changed, the length of the lever 32 is adjusted by changing the connecting hole 33 in accordance with the radius R of the main pipe 1. Also, the height of the lever mounting plate 30 and the mounting position of the connection hole 29 are changed according to the height of the branch pipe 2. Also, slide table according to radius r of branch pipe 2
The branch pipe rotating table 8 is moved by 17 and the pin 20 of the branch pipe diameter setting cam 10 is aligned with the round groove at a position half the radius r of the branch pipe 2.

In the above embodiment, the branch pipe diameter setting cam 10 in which the pin 20 is detachably protruded is formed in a disk shape, but may be formed in a flat plate shape. In the above embodiment, the reciprocating motion of the support rod 22 is controlled by the branch pipe diameter setting cam 10.
A description has been given of a case in which the power conversion mechanism 26 is combined with the cam ring 25. However, a structure in which a separate motor is provided and the support rod 22 is directly reciprocated while synchronizing the rotation may be used. In the above description, the case where a T-shaped duct is manufactured has been described. However, the present invention can be applied to various pipes such as a water pipe for flowing a liquid.

[0026]

As described above, according to the branch pipe edge bending apparatus for a T-shaped connecting pipe according to the present invention, the edge bending roller follows the curve of the edge portion of the branch pipe according to the diameters of the main pipe and the branch pipe. Can be moved while changing the angle, so that the bending angle of the bent portion is automatically bent at the optimum angle, thereby greatly improving workability.

[Brief description of the drawings]

FIG. 1 is a front view showing a branch pipe edge bending device for a T-type connecting pipe according to an embodiment of the present invention.

FIG. 2 is a front view showing the branch pipe edge bending device in a state where the branch pipe shown in FIG. 1 is rotated.

FIG. 3 is a plan view of the branch pipe edge bending apparatus shown in FIG. 1;

FIG. 4 is a side view of the branch pipe edge bending device shown in FIG. 1;

FIG. 5 is an enlarged front view showing a part of the edge bending roller shown in FIG.

FIG. 6 is a front view of a T-type connection pipe.

FIG. 7 is a vertical sectional side view of a T-type connecting pipe.

FIG. 8 is a perspective view of a branch pipe.

FIG. 9 is a sectional view showing a bent portion of each branch pipe.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Main pipe 2 Branch pipe 4 Edge 5 Bending part 6 Base 7 Gear box 8 Branch pipe rotating table 9 Gear box 10 Branch pipe diameter setting cam 11 Motor with continuously variable transmission 20 Pin 22 Support rod 25 Cam ring 26 Power conversion mechanism 30 Lever Mounting plate 32 Lever 35 Edge bending roller 36 Lifting bracket 37 Rotating roller 38 Fixed roller 42 Motor 45 Guide support

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21D 19/00 B21D 19/04 B21D 51/16

Claims (2)

(57) [Claims] And 1. A pipe branch rotatably provided on the base rotating table, provided above the branch pipe rotating table, this
When the branch pipe rotating table makes one rotation, the support rod reciprocates twice in the radial direction in the range of the radius of the branch pipe in synchronism therewith, and one end side is rotatably connected to the support rod and the radius of the main pipe. , A bend roller fixed to the other end of the lever, and a guide post for vertically guiding the bend roller along the bent portion of the branch pipe. A branch pipe edge bending device for a T-shaped connecting pipe. 2. A support rod comprising : a branch pipe diameter setting cam;
A pin protruding from the branch pipe diameter setting cam and slidable on this pin
To the side of the pin due to the rotation of the branch pipe diameter setting cam.
Power ring consisting of a cam ring that follows the
Connecting rod within the radius of the branch pipe.
2. The branch pipe edge bending device for a T-shaped connecting pipe according to claim 1, wherein the branch pipe is reciprocated .