JPH10146618A - Device for continuously bending tube and bending method using the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute bending work while rotating transporting rollers to the terminal part of a coil, to rotate the coil after that, to complete assembling simultaneously by carrying the coil with the transporting rollers. SOLUTION: This device is a continuous bending device for tubes which is equipped with at least two bending heads 11 for bending into a coil by bending the tubes to the right or to the left, the transporting rollers 12 with which assistance of bending at least on one side of the right side A or the left side B of the center of tube transportation and transportation are executed are provided and, on the extension of the transporting direction 6 of the transporting rollers 12, moving/transporting rollers 15 on which the coil is loaded and which are movable on rails 17 in the crossed transporting direction 7 almost perpendicular to the transporting direction 6 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal coil (hereinafter referred to as "coil") which is a heat exchanger installed in a flue section of a boiler or the like. The present invention relates to a tube continuous bending device for assembling a coil and a bending method using the device.

[0002]

2. Description of the Related Art Many boiler tubes have a coil structure as shown in FIG. 14. In particular, a coil installed in a flue has almost no three-dimensional three-dimensional bending, and is formed by bending in a two-dimensional one plane. Have been. In the case of a 3000 t / h class boiler, about 250 sets of coils having the same shape are attached in the furnace width direction. And since this coil is manufactured by plane bending, it is preferable to perform butt welding to a predetermined length in a straight pipe state as disclosed in Japanese Patent Publication No. Sho 62-49130, rather than performing butt welding after bending a single product. After the completion, the procedure of bending → extrusion → reversal is repeated to realize a continuous bending to produce a coil, or as described in Japanese Patent Publication No. 2-42013, a descending operation from a bending plane. Two bending heads (in this known example, four bending heads are used, but the bending operation can be performed with substantially two bending heads). Right bend (left bend) → extrusion →
A method of bending continuously with left bending (right bending) has been proposed as a rational method. However, usually, each coil to be manufactured is manufactured by continuously manufacturing bending tubes of the same shape as disclosed in Japanese Patent Application Laid-Open No. 5-270661, and thereafter,
We work on assembling bent pipes, and they are installed on a fixed surface plate and are manufactured by a method of attaching adhering hardware. However, some of the bent coils weigh up to several hundred kilograms, requiring labor for assembly and a crane. In addition, since coils having the same shape are continuously bent, a large area is required because the place of the coil that has been bent must wait for the production of another loop.

As shown in FIG. 14, the distance L ₁ between the coil end 2 and the first bending position 3 and the distance L ₂ between the final bending position 5 and the terminal end 4 are as shown in FIG. Normally, the distance L ₃ between the right-bending curved shape 25 and the left-bent curved shape 26 and the booster unit 29 capable of applying an axial compressive force.
Less than. For this reason, collet chuck (feed mechanism)
At 27, a continuous final bending position of the coil is brought to the position of the right bending bending die 25 or the left bending bending die 26, or the end of the coil is placed on the right bending pressure table 21 or the left bending pressure table 22 which receives the reaction force. Usually, a dummy tube (joint) is attached to the terminal portion 4 so that it has the same outer diameter and inner diameter as the coil, so that the portion 4 is engaged.
Are connected to each other, and the final bending position 5 is moved to the position of the right bending bending die 25 or the left bending bending die 26. In particular, by using a joint of an automatic clamping system such as hydraulic pressure, it is possible to electrically and continuously work by forming a sequence in the control device for attaching and detaching to and from the coil. That is, it becomes possible by providing a portion where the joint can be attached and detached at the end of the continuous bending program.

[0004] The continuous bending apparatus is usually provided with a roller conveyor (transport roller) for unloading in the same direction as the material transport direction. After continuous bending, the roller is put on the roller conveyor and the next product interferes. Unload to a position where it does not. However, in a 3000 t / h class boiler, the coil width is 10
m and the weight often exceeds 500 kg. In this case, the roller conveyor has a large resistance, and the straight pipe portion of the tube is plastically deformed by the rotational force in the transport direction applied to the bending clamp portion, and a large amount of labor is required for rework.

[0005] In a bending apparatus of the two-bending head type, FIG.
As shown in FIG. 4, when the coil is pushed out to the next bending position after bending the sleeve portion at the distal end with the right bending music die 25, the right bending music die 25 moves down, for example, and retreats, The next bending is performed by setting the bending curve 26 and the operation shown in FIGS. 5 to 8 is repeated to perform bending to the end portion 4. FIG.
As shown in the figure, since the end portion 4 is bent at a right angle to the transport direction of the coil, it cannot be transported by the transport roller 12 and it is necessary to attach and detach the dummy tube 30 as described above. For example, a straight pipe is used up to the welding positions a and b shown in FIG. In this case, after the final welding line, the bending process is performed in advance as a single item, and if the loops are combined as shown in FIG. 13, it is difficult to perform welding in all positions. It is necessary to carry out assembly work after implementation.

[0006]

In the conventional tube continuous bending apparatus, when the bending operation is completed up to the end, the conveying roller cannot be used for handling, the apparatus becomes a crane-based apparatus, and the joint is attached and detached. However, there is a problem that complicated work is required due to the necessity of the work, and there is a problem that assembly cannot be performed until the work of the final welding line is completed. Further, in the case of a large coil, resistance occurs between itself and the transport roller due to its own weight, causing a problem that the straight pipe portion undergoes plastic deformation.

An object of the present invention is to use a controllable joint, perform bending while rotating a transport roller to the end, and then rotate the coil, further carry out the transport roller, and simultaneously complete the tube assembly. An object of the present invention is to provide a bending device and a bending method using the device.

[0008]

In order to achieve the above object, a continuous tube bending apparatus according to the present invention comprises a tube having at least two bending heads for bending a tube right or left and bending it into a coil. In the continuous bending apparatus, a transport roller is provided on at least one of the right side and the left side of the tube transport center, and a movable transport roller on which a coil is mounted and is movable in a direction intersecting the transport direction on an extension of the transport direction of the transport roller. Installed configuration.

The transport rollers are provided on each side of the tube transport center. During the bending, the transport rollers in the tube bending direction are rotated in the retreating direction, and the transport rollers in the opposite bending direction are transported in the transport direction. The configuration may be such that it is rotated.

[0010] The transport roller may have a configuration in which at least one horizontal height that is separated from the tube transport center by a predetermined distance is at least 5 mm higher.

Further, the transport roller may have a configuration in which a length measuring device is installed on the way.

And in the tube continuous bending method,
In the tube continuous bending method using any one of the tube continuous bending apparatuses, the moving amount of the movable conveyance roller is set according to a measurement value of a length measuring device installed in the middle of the conveyance roller.

The tube is bent into a coil by a bending head while receiving the bending reaction force of the tube on the pressure table, a dummy tube is inserted into the terminal of the coil, and the coil is conveyed to a position outside the pressure table. May be clamped by a bending head, the dummy tube is removed, and the coil is turned by turning the bending head by a predetermined angle.

Further, the dummy tube may be configured to be inserted into the terminal end by a feed mechanism.

According to the present invention, in continuous bending of a large coil, the overall friction coefficient is reduced by changing the height of one or more transport rollers, and the transport rollers are moved in the transport direction (forward direction) before bending. Direction) or the reverse direction, the static friction coefficient is changed to the dynamic friction coefficient. Since the rotational force of the transport roller assists the bending rotational force, plastic deformation of the straight pipe portion is prevented. Further, by using the dummy tube as a joint to convey the coil, the terminal end is supplied to the inside of the curved shape, and the coil is bent into a coil without plastically deforming the straight tube portion. Further, the coil is carried out by the transport roller provided in parallel with the transport direction and the movable transport roller in the cross direction provided on the extension thereof, and the assembly is completed at the same time.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, at least two bending heads 11 equipped with a right bending bending die 25 and a left bending bending die 26 for bending a tube into a coil by bending the tube right or left, This is a tube continuous bending apparatus that bends a tube conveyed by the carry-in conveyor 19 into a coil (horizontal coil) and assembles the tube. A plurality of transport rollers 12 for transport are provided in parallel to the transport direction 6, and a coil is mounted on the transport roller 12 in an extension of the transport direction 6, and a rail 17 is provided in a cross transport direction 7 substantially perpendicular to the transport direction 6. Is provided with a movable transport roller (coil catcher) 15 that is movable.

The transport rollers 12 are provided on the sides A and B of the tube transport center, and
1, the conveying roller 12 on the bending direction side of the tube, for example, the right A side is rotated in the retreating direction,
And the conveying roller 12 on the side opposite to the bending direction, for example, the B side on the left side
Is rotated in the transport direction (forward direction). The transport roller 12 has a horizontal height set at least 5 mm or more above the transport roller 12 at a predetermined distance, for example, 3 to 9 m away from the tube transport center. Shall be installed. The sidewalk 18 and the joint attaching / detaching mechanism 20 are illustrated.

That is, the object of the present invention is achieved by the following operation. The height of one or two of the transport rollers 12 is changed to another transport roller 1.
2 and the transport rollers 12 on the right and left sides (A and B sides) of the tube transport center line are rotated left and right oppositely. After the end is bent, a dummy pipe is used again as a joint. , Collet chuck (feed mechanism) 27
The right end bending pressure table 21 or left bending pressure table 22
90 ° with the bending head 11
Then, the coil is carried out by rotating the transport roller 12, but at this time, it can be moved in the cross transport direction 7 at the same height as the transport roller 12 to the outside of the rotation radius behind the transport roller 12 at this time. In addition, another moving conveyance roller 15 must be installed. When the coil is unloaded, the bent loop is inserted into a predetermined position of the coil on the moving conveyance roller 15 which has already been bent. The movable transport roller 15 is moved in advance, and both the fixed transport roller 12 and the movable transport roller 15 are rotated, the coil already stored is slipped by the stopper, and only the newly transported loop is moved. This includes moving relatively toward the moving conveyance roller 15.

Next, as another embodiment of the present invention, as shown in FIGS. 1 to 13, a tube continuous bending method using any one of the tube continuous bending apparatuses, The moving amount of the moving and conveying roller 15 is set in accordance with the measurement value of a length measuring device (not shown) installed in the middle of the tube 12, and the bending reaction force of the tube is controlled by a pressure table (right and left bending pressure table) 21. , 22; bending the coil by the bending head 11 while receiving the coil; receiving a dummy tube 30 at the end of the coil;
A step 103 of transporting the end portion 4 to a position outside the pressure tables 21 and 22; a step 104 of removing the dummy tube 30 after clamping the end portion 4 with the bending head 11; and rotating the bending head 11 by 90 ° at a predetermined angle. Step 105 of rotating the coil by rotating the transport roller 12 and step 106 of unloading the coil by rotating the transport roller 12 and placing the coil at a predetermined position on the movable transport roller 15
In order to pierce the next loop after bending the coil on the movable transport roller 15,
Is moved, and the transport roller 12 and the movable transport roller 1 are moved.
5), the coil already housed is slipped by the stopper, and only the newly conveyed loop relatively moves toward the moving conveyance roller 15.
07 and a step 108 for completing the assembly of each loop. The dummy tube 30 is to be inserted into the end portion 4 by the collet chuck 27.

That is, the bending is performed while the left and right bending heads are transferred. In order to prevent plastic deformation from occurring in the straight pipe due to frictional resistance between the coil and the transport roller during bending, FIG.
When the transport rollers 12 in the range of A to A 'on the fixed table 14 shown in (1) are bent right (leftward), the transport roller on the right side (left transport roller) from the center of the tube transport is rotated in the backward direction. The horizontal level of at least one of the transport rollers is set to be 5 mm or more above. In this way, the bending process is performed continuously in the horizontal coil shape. As shown in FIG. 8, the terminal end is conveyed to the bending head 11 by the dummy tube 30, and as shown in FIG. 10, the coil is turned and carried out by clamping and turning with the bending head 11. The unloaded coil is a movable transport roller 15 movable at right angles to the transport direction as shown in FIGS.
Incorporated above.

As described above, by rotating with the aid of the transport roller during bending and raising the horizontal level of one of the rollers, plastic deformation of the straight pipe portion of the coil is prevented and continuous bending becomes possible. . The end of the coil is transported by the dummy tube, and the coil can be turned without using another device. By this rotation, it is possible to carry out by the movable transport roller, and thereby, the coil can be incorporated in the movable transport roller.

According to the present embodiment, the butt welding can be performed downward in the state of a straight pipe, and the quality can be improved. Also, the number of steps is reduced and the number of steps is reduced. Since the lengthened tube can be automatically bent all the way to the end, it is finally assembled and transported in a coil shape, eliminating the need for a work place and reducing the amount of work required to suspend the product. Can be worked alone or unmanned. In addition, the production process is clearly separated, and a line can be formed.

[0023]

According to the present invention, since the tube is rotated with the aid of the transfer roller and bent by raising one horizontal level, the bending force of the tube is increased and the friction with the transfer roller is reduced, so that the coil is reduced. The plastic deformation of the straight pipe portion is prevented, and the end portion of the coil is transported by the dummy pipe, so that continuous bending is possible. Then, the coil is turned by the bending head, carried out by the movable transport roller, and can be assembled on the movable transport roller.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a bending head mechanism of FIG. 1;

FIG. 3 is a diagram showing an operation sequence of bending.

FIG. 4 is a diagram showing an operation sequence of bending.

FIG. 5 is a diagram showing an operation sequence of bending.

FIG. 6 is a diagram showing an operation sequence of bending.

FIG. 7 is a diagram showing an operation sequence of bending.

FIG. 8 is a diagram showing an operation sequence of bending.

FIG. 9 is a diagram showing a turning operation of the coil.

FIG. 10 is a diagram showing a turning operation of a coil.

FIG. 11 is a diagram showing an assembling operation of the coil.

FIG. 12 is a diagram showing an assembling operation of the coil.

FIG. 13 is a diagram showing an assembling operation of the coil.

FIG. 14 is a diagram showing an example of a conventional coil.

[Explanation of symbols]

 2 Coil end 3 First bending position 4 Ending portion 5 Final bending position 6 Transport direction 7 Cross transport direction 11 Bending head 12 Transport roller 15 Moving transport roller 17 Rail 19 Carry-in conveyor 20 Joint attaching / detaching device 21 Right bending pressure table 22 Left Pressure table for bending 25 Curved mold for right bending 26 Curved mold for left bending 27 Feed mechanism 30 Dummy tube

Claims (7)

[Claims] 1. A tube continuous bending apparatus provided with at least two bending heads for bending a tube into a coil by bending the tube right or left, a transfer roller is provided on at least one of a right side and a left side of a tube transfer center, A tube continuous bending device, comprising a movable transport roller mounted with the coil and movable in a direction intersecting the transport direction, on an extension of the transport direction of the transport roller. 2. The tube continuous bending apparatus according to claim 1, wherein the transport rollers are provided on each side of the tube transport center, and at the time of bending, the transport rollers in the tube bending direction are rotated in a retreating direction. And a conveying roller on the side opposite to the bending direction is rotated in the conveying direction. 3. The continuous tube bending apparatus according to claim 1, wherein at least one horizontal height of the transport roller, which is a predetermined distance away from the tube transport center, is set at least 5 mm above. Tube continuous bending equipment. 4. The continuous tube bending apparatus according to claim 1, wherein the transport roller is provided with a length measuring device in the middle of the conveying roller. 5. The continuous tube bending method using the continuous tube bending apparatus according to claim 1, wherein the moving and conveying roller is moved in accordance with a measurement value of a length measuring device installed in the middle of the conveying roller. A continuous moving amount of the tube is set. 6. The tube continuous bending method according to claim 5, wherein the coil is bent by a bending head while receiving a bending reaction force of the tube by a pressure table, and a dummy tube is inserted into an end portion of the coil. A tube which transports a terminal end to a position outside the pressure table, clamps the terminal end with the bending head, removes the dummy tube, turns the bending head by a predetermined angle, and turns the coil. Continuous bending method. 7. The continuous tube bending method according to claim 6, wherein the dummy tube is inserted into the terminal end by a feed mechanism.