JPH0653296B2 - Left and right two-stage pipe bending device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bending apparatus applied to bend a boiler tube or the like.

<Prior art> Pipe bending devices (benders) that are used to bend tubular materials such as land boiler tubes are generally only for one-sided bending (bending in one direction). Since input work is required, short bending or work by a large number of people is required. A conventional bender has only one type of bending die, and when two types of bending dies are required for one tube, split bending is required, and setup work increases.

<Problems to be Solved by the Invention> FIG. 7 shows an example of a bent shape of the tube 1 for a land boiler superheater and reheater. The tube 1 shown in the figure is formed by bending a long tube that requires two types of bending radii and requires seven bending places. However, in the conventional bender, it is necessary to invert each bending only for one bend, which is inefficient. Bending work. Since the conventional bender has one type of bending radius,
It is inefficient because it is necessary to replace the mold for each bending radius or to make a short bend.

As described above, conventionally, it is necessary to divide the tube 1 into three parts for each bending radius using a bender (see FIG. 8), and weld the divided tubes 1a, 1b, 1c after short-length bending. However, the automatic pipe welding at the time cannot be applied, and the cost is significantly increased. Further, when a plurality of commercially available vendors are combined in order to solve the above problems, it is expensive and requires a large installation place, which is not practical in terms of work.

The present invention has been made in view of the above circumstances, and provides a left and right two-stage pipe bending device capable of bending two types of radii and bidirectionally bending in two directions, thereby simplifying the pipe bending work. The purpose is to

<Means for Solving Problems> The configuration of the present invention for achieving the above-mentioned object is to divide two types of bending dies having different diameters into upper and lower parts and dispose them in the device main body, and to bend the device main body with the bending. Equipped with a mold opening / closing means for opening / closing the mold, the apparatus main body on both sides of the bending mold is provided with pressure molds capable of moving toward and away from the bending mold and moving up and down, and elevating the apparatus main body. It is characterized in that it is provided with an ascending / descending traverse means for moving and laterally moving.

<Operation> The apparatus main body is moved to position the bending die on the left or right side of the tube with the center of the tube as a reference, and the pressure die on the side where the tube is arranged is moved closer to the bending die to perform bending work. The bending angle of the pipe is determined by the bending mold that is positioned with respect to the pipe of the two types of bending molds, and the bending direction is determined by the side where the bending mold is positioned with respect to the pipe.

<Embodiment> FIG. 1 is a front view of a left and right two-stage pipe bending apparatus according to an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a side face thereof, and FIG. The operation concept showing the bending position of the bending die, the operation concept showing the bending position of the upper stage bending die are shown in FIG. 5, and the operation concept of the pressure die is shown in FIG.

In FIG. 1 to FIG. 3, 11 is a device main body, and the device main body 11 can be moved laterally by a lateral movement mechanism 12 and can be raised and lowered by an elevating mechanism 13. Reference numeral 14 is a bending die, and the bending die 14 has two types of dies 14a having different diameters,
14b, the bending die 14 is attached to a die opening / closing shaft 16 of a main body frame 15, and the bending die 14 can be opened and closed by a die opening / closing cylinder 17. A pressure mold 18 for left bending and a pressure mold 19 for right bending are arranged on the apparatus main body 11 on both sides of the bending mold 14, and each pressure mold 1
8 and 19 can be moved up and down by the pressure die lifting mechanisms 20 and 21, respectively, and the bending dies 14 can be moved by the slide mechanisms 22 and 23.
It is possible to approach and separate from each other. Reference numeral 24 in the drawing is a bending angle detection device.

Next, the bending position of the tube 1 shown in FIG. 7 will be described.

The apparatus main body 11 moves from the origin position (the bending die 14 in FIG. 4 is in the A position) to operate the lateral movement mechanism 12 and the elevating mechanism 13 to move to the first bending preparation position.
Since the bending position is a large radius bending, the lower mold 14b
The upper mold is the mold opening / closing shaft 16 in the main body frame 15.
Is opened by the mold opening / closing cylinder 17 to divide the mold 14b into upper and lower halves (the bending mold 14 is in the B position in FIG. 4). Next, after positioning the tube 1 at the first bending position, the lateral moving mechanism 12 moves the bending die 14 to the central position of the tube 1 (the bending die 14 is in the C position in FIG. 4). In addition, 25 in FIG. 4 is a tube holder. During this time, the pressure die 18 for left bending is elevated by the pressure die elevating mechanism 20 from the lowest position a to the lower die bending position b (see FIG. 6). Next, the mold opening / closing shaft 16 of the main body frame 15 is closed by the mold opening / closing cylinder 17 and the tube 1
Is clamped (the bending die 14 in FIG. 4 is at the D position).
The pressure die 18 for left bending is advanced by the slide mechanism 22 to perform bending. When the bending angle at this time reaches the angle set by the bending angle detection device 24, the bending is stopped. After the bending is completed, the pressure die 18 is retracted to open the die opening / closing shaft 16 by the die opening / closing cylinder 17, and the apparatus main body 11
Moves down and moves laterally to avoid the tube 1 (the bending die 14 in FIG. 4 is in the B position). During this time, the pressure die 18 descends and returns to the origin position.

Next, the center of the tube 1 is not changed and preparations for right bending at the bending position are made. First, the apparatus main body 11 is lowered to the lowest position by the elevating mechanism 13 and, at the same time, the mold opening / closing shaft 16 is closed by the mold opening / closing cylinder 17, and then the lateral movement mechanism 12 moves the apparatus main body 11 to the right bend side. During this time tube 1
Moves to the right curve origin position (the bending die 14 in FIG. 4 is in the E position). Since the bending radius of the bending position is the same as that of the bending position, the used mold is the same mold 14b. The apparatus main body 11 operates the elevating mechanism 13 to move up to the right bending preparation position and open the mold opening / closing shaft 16 by the mold opening / closing cylinder 17 (the bending mold 14 is in the F position in FIG. 4). The lateral movement mechanism 12 moves the bending die 14 to the center position of the tube 1, and the die opening / closing shaft 16 is closed by the die opening / closing cylinder 17 to clamp the tube 1 (the bending die 14 is at the G position in FIG. 4). State). During this time, the pressure-bending mold 19 for right-bending is elevated from the lowest position a to the bending position b by the pressure-die lifting mechanism 21. The pressure die 19 for right turn is advanced by the slide mechanism 23 to bend. When the bending angle at this time reaches the angle set by the bending angle detection device 24, the bending is stopped.

By repeating the above operation, the tube 1 can be bent left and right without being inverted. When performing a small-diameter bending at the bending position, the upper mold 14a is used. The center of the tube 1 is always at the tube center position, and the tube 1 is conveyed by a carriage (not shown) and fixed by a chuck.

<Effects of the Invention> The left-right two-stage tube bending device of the present invention can perform left-right bending with a single device, thus eliminating the need for reversing work.

A single device can be used as a two-stage mold, which allows bending with two different diameters, eliminating the need for mold replacement work.

By consolidating the above functions into one device, the equipment can be simplified.

Since the mold and the pressure mold are positioned with respect to the tube, the tube transfer equipment can be simplified.

As a result, long bending can be performed without inverting work, the tube manufacturing cost can be significantly reduced, setup work can be reduced, and efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a front view of a left and right two-stage pipe bending apparatus according to an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a side view thereof, and FIG. 4 is a bending of a lower bending mold. Fig. 5 is a conceptual diagram showing the position, Fig. 5 is a conceptual diagram showing the bending position of the upper stage bending die, Fig. 6 is a conceptual diagram showing the operation of the pressure die, Fig. 7 is a plan view showing the bending shape of the tube, FIG. 8 is a plan view of the tube divided into three parts. In the drawings, 11 is a device main body, 12 is a lateral movement mechanism, 13 is a lifting mechanism, 14 is a bending mold, 17 is a mold opening / closing cylinder, 18 and 19 are pressure molds, 20 and 21 are pressure mold lifting mechanisms, and 22, Reference numeral 23 is a slide mechanism.

Claims (1)

[Claims] 1. A bending mold of two types having different diameters, which is divided into an upper part and a lower part, which are arranged in a device main body, and which has a mold opening / closing means for opening and closing the bending mold. A left and right two-stage pipe bending device provided with pressure dies capable of moving toward and away from the bending die and moving up and down with respect to the bending die on both sides, respectively, and provided with elevating and traversing means for vertically moving and laterally moving the equipment body.