JPS61259837A - Bending device for tube - Google Patents

Abstract

PURPOSE:To improve working efficiency without moving horizontally a long- sized tube by arranging a booster device, tube supporting rollers and tube feeder in alignment atop the leg part of a common bed. CONSTITUTION:The tube supporting rollers 3 which supports the long-sized tube are provided to the required position atop the leg part 2 of the T-shaped common bed 1 and a length measuring carriage 4 which is movable at a high speed moves in the axial line direction of the lg part 2 to deliver the straight tube to be worked to the prescribed bending position. A twist chuck device 6 which pinches and fixes the straight tube to be worked is provided on the carriage 4. The booster device 11 constituted of a collect chuck 9 for fixing the straight tube to be worked and a hydraulic cylinder 10 to exert the thrust to the straight pipe to be worked in the axial direction in the stage of bending is provided to the part where the leg part 2 and arm part 8 of the common bed 1 cross.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a bending device for continuously bending boiler tubes and the like to arbitrary angles of 180 degrees or less, more specifically, A, HyC, (Auto-matic-Hea
d-Chanker: A multi-head pipe bender with an automatic head switching mechanism, in which two bender heads are arranged in a straight line with an appropriate gap in the horizontal and right angle direction to the pipe axis of the straight pipe to be processed, and the heads are The machine incorporates two or more bending dies with different bending radii, and is capable of changing the head at high speed to perform continuous multi-point meandering bending of different types of long pipes.

[Prior Art] In a large land boiler, a superheater and a reheater occupy a large proportion as important components. The tube elements of these superheaters and reheaters are formed by reciprocating long tubes at predetermined intervals while bending the ends into a U-shape. The bent portion is composed of a small R bend (same radius as the tube diameter) and a bending radius that does not include the small R bend.

In manufacturing tube elements such as boiler tubes used in these superheaters and reheaters, please refer to Figures 3 and 4.
As shown in the figure, the tube a cut to a predetermined length is bent into U-, 8-, and cross-shaped shapes using a rotary drawer set bender.
The straight pipe section of the pipe was also joined by butt welding to form a long bent pipe.

FIG. 5 shows a combination of three types of long tubes c, c', and c'' produced by such a conventional method, and shows the shape of one set of tube elements.

[Problems to be Solved by the Invention] However, welding the straight portion of the bent tube a involves welding in all positions and requires advanced technology.

Furthermore, the assembly and inspection processes are complicated and require a large amount of assembly time.

[Means for Solving the Problems] In order to solve the problems such as the conventional complicated process and the need for advanced welding technology, the present invention provides a method for solving problems such as the conventional complicated process and the need for advanced welding techniques. A movable table is provided, and two or more types of bending molds are exchangeably provided on the chi and pull, and a bender for right-hand bending and a bender for left-hand bending are raised and lowered separately at required intervals. A tube bending device was constructed by arranging a booster device, a tube support roller, and a tube feeding device in a straight line on the upper surface of the leg of the common bed.

A long straight pipe to be processed, which is formed by connecting straight pipes in series by butt welding, is bent horizontally at a preset first bending position with a required bending radius and bending direction. Prepare and bend at the specified bending angle. Next, the straight pipe to be processed is advanced to a second bending position, and at the second position, a bender with a required bending radius and bending direction is prepared and bent at a predetermined bending angle.

In this way, by preparing multiple benders in a line and repeating the process of bending the straight pipe to be processed at a predetermined position and bending angle with the required bending radius and bending direction as many times as necessary, it is possible to continuously produce a large number of different types of long tubes. Point meander bending can be performed.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the device of the present invention,
Tube support rows are installed at predetermined positions on the upper surface of the legs 2 of the common bed 1, which is T-shaped when viewed from above, to support the straight pipes to be processed, such as long tubes (not shown) formed by welding a plurality of straight pipes. 53, a high-speed movable length measuring carrier 4 and rails 5 are provided on the upper surface of the leg 2 in the axial direction of the leg 2 to feed the straight pipe to be processed to a predetermined bending position.
A twist chuck device @ 6 for clamping and fixing the straight pipe to be processed is provided on the length measurement carrier cart 4, and the tube support roller 3 is held in place by the tube chuck device 6. The straight pipe to be processed is fed through the
A length measuring device (built-in in the carriage 4) is provided to send out setting values in response to commands from an external device.

A collet chuck 9 fixes the straight pipe to be processed at the intersection of the leg part 2 and the arm part 8 of the common bed 1, and applies an axial thrust to the straight pipe to be processed fixed to the collet chuck 9 during bending. A booster device 11 comprising a hydraulic cylinder 10 is provided.

A guide rail 12 is laid parallel to the side wall of the arm portion 8 of the common bed 1, and a table 13 that can easily move laterally along the guide rail 12 is fitted onto the guide rail 12.
A drive device (not shown) is installed on the table 13 for horizontal movement at high speed.

The length measuring device M is mounted on the table 13 while rotating itself.
A total of two bender units, one each for right bending 14 and left bending bender 15, which bend the straight pipe to be processed sent out by 1 in the horizontal direction at a predetermined angle (180 degrees or less), can be raised and lowered at required intervals. It is arranged.

Each bender 14.15 is a multi-head pipe bender having △, H, C, mechanisms, and a bender head 16.1.
7 is arranged in a direction perpendicular to the axis of the straight pipe to be processed,
Bending dies 18, 19, and 20° 21 having different bending radii are assembled to each bender head 16, 17, stacked one on top of the other so that the axes of the respective bending dies coincide.

To explain the bender 14.15 in more detail, the bender 14.15 is a rotary drawer set bender, and while a part of the straight pipe to be processed is fixed to the bending die, the bending die is moved in a predetermined direction by a driving source. This is a pipe bending device that performs bending by winding the straight pipe to be processed around a bending die.

This device has a rotary shaft for rotating a bending mold and a drive device for driving the rotary shaft built in a rectangular cylinder, and both ends of the rotary shaft protrude from the upper and lower surfaces of the box shape. ，
Rotary table 22 for fixing 19, 20, 21
．． 23 is fixed.

The bending dies 18, 19, 20, and 21 are fixed so as to be vertically overlapped at positions where the axes of the bending dies and the axis of the rotating shaft coincide. The rotary tables 22 and 23 have a clamp mechanism such as a clamp die holder for fixing the straight pipe to be processed to the bending die. A pressure type such as a pressure die holder is installed on the box-shaped upper surface of the straight pipe to be processed so as to be in contact with the clamp mechanism and to receive the reaction force during bending of the straight pipe to be processed. Further, on the opposite side between the pressure die and the straight pipe to be processed, a wrinkle suppressing metal fitting such as a wiper die holder is installed on the box-shaped upper surface so as to be in contact with the bending die. A guide receiver and a driving device for raising and lowering the bender head are provided on the box-shaped rear surface. These clamp mechanisms such as clamp die holders, pressure types such as pressure die holders, and wrinkle suppressing metal fittings such as wiper die holders grip or press the straight pipe to be processed during bending of the straight pipe to be processed, The clamp die holder rotates along the bending die.

Further, a clamp device is provided for fixing a predetermined arbitrarily selected bender head to the common bed 1.

Furthermore, it is equipped with a hydraulic unit for driving each of the above-mentioned devices, and a control device for controlling these.

Next, a specific example of continuous bending into an S-shape will be described in the case of obtaining the boiler tube C shown in FIG. 5. Second
Figures (a) to (h) show the process of making boiler tubes.
8.20 is IDR (bending radius equal to the pipe diameter) and bending die 19.21 is 3D (bending radius 3 times the pipe diameter). Also, bending molds 18 and 19 are right-hand bending molds, and bending mold 20
．． 21 is a left-bent type. The state in which the bending die is lowered is shown by a dotted line.

In FIG. 2(a), the long tube 24 is fed to a bending position, and the bending die 19 is moved laterally and raised to lie along the tube 24. Next, as shown in FIG. 2(b), the bender 15 is used to bend 90 degrees to the right, and the portion A shown in FIG. 5 is bent. After this process is completed, the tube 24 is advanced by 11 as shown in FIG.
9. is lowered and moved laterally, and then the bending die 21 is raised and aligned along the tube 24. Next, as shown in Fig. 2 (d), the tube 2 is bent 90 degrees to the left using the bender 15 to bend the part B, as shown in Fig. 2 (e).
4 is advanced by 12 degrees and bent 90 degrees to the left by the bender 15 to perform the bending process of the portion C.

As shown in FIG. 2 (G), the bending die 21 is moved downward and laterally while the tube 24 is advanced by a distance L, and then the bending die 18 is raised and moved along the tube 24. Then, as shown in Figure M2 (H), the portion D is bent 180 degrees to the right using the bender 14.

Thereafter, the processes shown in FIGS. 2(d) to 2(g) are repeated to process a boiler tube of the required length, and all bending processes are completed.

Note that the tube bending device of the present invention is not limited to the above-described embodiments; in the above explanation, an example of continuous bending in an S-shape is shown, but the tube bending device of the present invention is Of course, various changes can be made without departing from the gist of the present invention, such as being able to bend it arbitrarily regardless of the shape, such as a three-dimensional Ω-shape or a W-shape.

[Effects of the Invention] As explained above, according to the tube bending device of the present invention, it is possible to perform continuous multi-point meandering bending of different types of long tubes without horizontally moving the long tubes. This eliminates the need for tube handling and welding work for pipe fitting after bending, and provides various excellent effects such as greatly improving work efficiency.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the apparatus of the present invention, FIGS. 2(A) to (H) are views showing each process of bending a long tube by the apparatus of the present invention, and FIG. FIG. 4 is a diagram showing an example of a conventional bent connecting tube, FIG. 4 is a diagram showing another example of a conventional bent connecting tube, and FIG. 5 is a diagram showing an example of a boiler tube. 1 is a common bed, 2 is a leg part, 3 is a tube support roller, 4 is a carrier for the vice length, 6 is a tube chuck device, 8 is an arm part, 11 is a booster device, 12 is a guide rail, 13 is a table, 14゜15 is vendor, 18.19
, 20. 21 indicates a bending die, and 24 indicates a tube. Patent application Hitoshi Kawajima Bankyu Heavy Industries Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] 1) A horizontally movable table is installed on the side of the arm of a T-shaped common bed, and two or more types of bending dies are provided on each table so that they can be exchanged. A bender that performs right-hand bending and a bender that performs left-hand bending. and a booster device, a tube support roller, and a tube feeding device are arranged in a straight line on the upper surface of the leg of the common bed, and the tube bending device is characterized in that the tube bending device is arranged such that they can be raised and lowered separately at a required interval, and a booster device, a tube support roller, and a tube feeding device are arranged in a straight line on the upper surface of the leg of the common bed. Processing equipment.