JPH0428652Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a bending device for a long member, and is particularly suitable for bending a long member such as a long tube forming the furnace wall of a boiler at four locations at the same time. The present invention relates to a suitable bending device for elongated members.

[Background of the idea]

In recent years, membrane panels have been increasingly used for boiler furnace walls. The membrane panel consists of a large number of tubes arranged in parallel at the required width intervals.
The tubes are welded together with narrow plates to form a single plate-like body (panel).

By the way, as shown in FIG. 6, it is necessary to provide a large number of openings 1 in the furnace wall of the boiler due to its structure, and the positions and sizes of the openings 1 are not constant depending on the type of boiler. Furthermore, since the furnace wall is usually about 2.5 to 3 m wide and about 25 m long, we purchased standard length tubes (about 11 m) and butt-welded them to make them longer.
After that, the portion of the long tube 2 located at the opening is bent, and each long tube 2 is bent.
is connected to header 3.

Bending one long tube for one opening consists of four vents, but conventionally a 4-type bender was used to bend each vent, which resulted in the problem of requiring a lot of man-hours.

In addition, when bending near the end of a long tube, there is little swinging allowance for the tube, but when bending the center of the tube, which is about 11m from the tube end, the tube swinging allowance increases, so a large work space is required. There was a problem that not only made the process difficult, but also involved extremely dangerous work.

[Purpose of invention]

The purpose of the present invention is to solve the above-mentioned problems of the prior art, and to create a long member such as a long tube that can be bent in four places at the same time safely and without requiring a large space. The purpose of the present invention is to provide a bending device.

[Summary of the idea]

In order to achieve the above-mentioned object, the present invention provides a long member bending device that bends a part of the long member in the middle thereof, and includes a pair of receiving mold rollers and a bending device for bending the long member between the pair of receiving mold rollers. A receiving roller separation adjustment mechanism that adjusts the separation distance corresponding to the longitudinal direction, a pair of notched approximately circular pressing rollers, and a pressing roller that adjusts the separation distance corresponding to the longitudinal direction of the elongated member of the pair of pressing rollers. a separation adjustment mechanism, a pair of adjustment rollers installed on the outside in the longitudinal direction of the elongated member with respect to the pressing roller, and an adjustment for adjusting a separation distance corresponding to the longitudinal direction of the elongated member between the pair of adjustment rollers. A roller separation distance adjustment mechanism, a drive unit that drives the pressing roller in the direction of the elongated member, and a drive unit that drives the adjustment roller in the direction of the elongated member independently of the pressing roller. It is.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a bending device for a long member according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a plan view showing an embodiment of the present invention. A pressing roller 10 that determines the inner bending width of the opening 1 and moves horizontally facing the long tube 2 during bending is installed at the top of the main body 12 together with a hydraulic cylinder 11 that drives the roller 10.

The pressing rollers 10 are arranged symmetrically in the longitudinal direction of the long tube 2, each having a substantially circular shape with a notch, and are rotatable.
The distance parallel to the long tube 2 of 0 and 10 is adjusted, thereby making it possible to correspond to the bending width of the long tube 2.

facing the pressing roller 10 and the pressing roller 1
Receiving rollers 13a and 13b are installed outside the pressing roller 10 by a distance equal to the sum of the tube diameter width of the long tube 2 and the radius of the roller from the side end surface of the tube.
The mold receiving rollers 13a and 13b are rotatably fixed to roller mounting bases 14a and 14b, respectively, and are arranged parallel to the long tube 2 so that the main body 12
It is movably attached to a guide rail 15 fixedly installed above.

At both ends of the guide rail 15, mold moving handles 16a and 16b are installed for moving the mold receiving rollers 13a and 13b by threading screw members onto the roller mounting bases 14a and 14b.

On both sides of the press roller 10, the press roller 1
Spring back adjustment rollers 17a and 17b are disposed at the same height level as the tube 0, and move horizontally when bending the tube, and bend the long tube 2 at a certain angle using the receiving rollers 13a and 13b as fulcrums. Ru.

These spring back adjustment rollers 17a and 1
7b is connected to air cylinders 18a and 18b which horizontally move the rollers relative to the elongated tube 2. The air cylinders 18a and 18b are mounted on guide rails 19a and 19b fixedly installed on the main body 12 and parallel to the long tube 2. Further, air cylinder moving handles 20a and 20b for moving the air cylinders 18a and 18b in the longitudinal direction of the elongated tube 2 are coupled to each of the air cylinders 18a and 18b.

Spring back adjustment rollers 17a and 17b
The positioning of the press roller 1 is performed as shown in FIG.
0 center and the receiving roller 13a or 13b
The handles 20a and ₂ are adjusted so that l ₂ , the distance between the receiving roller 13a or 13b and the springback adjustment roller 17a or 17b, is equal to l 1.
Adjust by turning 0b.

These spring back adjustment rollers 17a and 1
The reason for providing 7b is that the receiving rollers 13a and 13
When the long tube 2 disposed along the direction b is pressed only by the pressing roller 10, both ends open in a V-shape as shown in FIG.
This is to prevent the need for subsequent processing.

Spring back adjustment rollers 17a and 17b
By providing this, it is possible to support the reaction force of the elongated tube 2 caused by the pressing roller 10, and the bending process of the opening 1 can be completed in one step as will be described later.

In the above structure, the bending process will be explained based on FIGS. 3 to 5. First, mark the bending center position of the long tube 2, which is the workpiece, and place the receiving rollers 13a on both sides of the marked line.
Rotate and set the receiving mold moving handles 16a and 16b so that the mold moving handles 16a and 13b are positioned. Also,
The air cylinders 18a and 18b are driven so that the spring back adjusting rollers 17a and 17b are fully retracted, and the distance _l2 described above is set to match _l1 .

Next, the long tube 2 is set in the bending device (the scribed portion is correctly positioned and set on the press roller 10 and receiving rollers 13a, 13b). After this, air cylinders 18a and 18b
to adjust the spring back adjustment roller 17a.
and 17b are moved to the long tube 2 side, and the long tube 2 is fixed in combination with the receiving rollers 13a and 13b.

Next, as shown in FIG. 3, the air cylinders 18a and 18b are driven by the pre-calculated pushing distance, and the spring back adjustment rollers 17a and 17 are
b is pushed out (advanced), and the pressure allowance is bent prior to the bending process by the pressing roller 10, as shown in FIG. While maintaining the spring back adjustment rollers 17a and 17b in the state shown in FIG. 3, the hydraulic cylinder 11 is driven to move the press roller 10 forward toward the long tube 2, and as shown in FIG. Press and bend to the width.

Next, as shown in FIG.
By returning a and 17b to their initial positions, the long tube 2 can be bent at four locations in one step. Moreover, there is no need for swinging and bending like in the conventional 4-type bender, improving safety.

Also, when bending the long tube 2, the receiving rollers 13a, 13b and the spring back adjusting roller 1
7a and 17b are spaced at a predetermined interval, the bending force is small, and the bending process is then performed with the press roller 10, so that the long tube 2
On the other hand, a large bending force is not required, and damage such as cracking of the elongated member 2, especially the elongated tube, is prevented.

That is, the springback adjustment roller 17
a, 17b independently in the direction of the long tube 2 to move the long tube 2 to the receiving rollers 13a, 13b.
Using the tube as a fulcrum, bending is performed at a predetermined angle, and then, following the bending of the long tube 2, the central portion is bent.

Therefore, in the first bending process, the bending process is performed at a portion spaced apart from the center of the bending process, and then the bending process is performed at the center part.

Normally, the bending force is inversely proportional to the distance from the bending point to the point pressed by the roller, so if this distance is long, the bending force will be small. Further, since the force applied at the initial bending process is small, damage to the long tube 2 can be prevented.

Further, press rollers 10, 10 each having a substantially circular notch shape are provided symmetrically with respect to the elongated tube 2. For this reason, in the case of a short bend in a straight part, both pressing rollers 10, 10 are integrated to maintain the function as a roller, and in the case of a long bend in a straight part, both pressing rollers 10, 10 are separated. You can distance yourself. Therefore, it is possible to perform convex bending in which straight portions have different lengths.

Further, since the long tube 2 is not restrained by the mold during the bending operation on both sides of the bent portion, the bending by the springback adjustment rollers 17a and 17b can be easily followed, and the position relative to the long tube 2 can be adjusted. The long tube 2 can be bent with high accuracy, and the long tube 2 can be bent with high accuracy.
without causing any damage.

Although the press roller 10 and the spring back adjustment rollers 17a and 17b are driven by cylinders, they may be driven by other drive devices.

[Effect of idea]

As explained above, according to the bending device for a long member according to the present invention, a pressing roller is disposed inside the bending portion for forming an opening, and a pair of receiving molds is provided on the outside for regulating both ends of the bending portion. By providing a roller and an adjustment roller that cancels out the reaction force generated when pressed by the press roller, the bending process performed at four locations on the long member to form the opening can be easily swung around. It can be done in one step at a time without any need. This eliminates the need for corrective bending work in the final process, which was conventionally necessary, and improves quality.

Furthermore, since each roller can be easily positioned using a handle, etc., it is possible to improve setup changeovers, and there is less movement of the long member during bending, so it is easier to position than before. This allows bending to be performed in a small working space.

[Brief explanation of the drawing]

Figure 1 is a plan view showing one embodiment of the present invention;
The figure is an explanatory diagram of the bending process when the springback adjustment roller according to the present invention is not provided, Figures 3, 4, and 5 are explanatory diagrams of the bending process according to the present invention, and Figure 6 is the furnace wall of the boiler. FIG. 2 is a schematic configuration diagram showing the structure of FIG. 2...Long tube, 10...Press roller, 1
1...Hydraulic cylinder, 12...Main body, 13a, 1
3b...Mold roller, 14a, 14b...Roller mounting base, 15, 19a, 19b...Guide rail, 16...Mold moving handle, 17a, 17b
...Spring back adjustment roller, 18a, 18
b...Air cylinder, 20a, 20b...Air cylinder moving handle.

Claims (1)

[Scope of utility model registration request] In a long member bending device that bends a part of the long member in the middle, a pair of receiving mold rollers and a receiving mold that adjusts a distance between the pair of receiving mold rollers corresponding to the longitudinal direction of the long member. a roller separation adjustment mechanism;
a pair of notched approximately circular pressing rollers; a pressing roller separation adjustment mechanism for adjusting a distance corresponding to the longitudinal direction of the elongated member of the pair of pressing rollers; and an outer side in the longitudinal direction of the elongated member with respect to the pressing roller. a pair of adjustment rollers installed in the holder, an adjustment roller separation distance adjustment mechanism for adjusting a separation distance corresponding to the longitudinal direction of the elongated member between the pair of adjustment rollers, and driving the pressing roller in the direction of the elongated member. and a drive section that drives the adjustment roller in the direction of the elongated member independently of the pressing roller.