JP2869050B2 - Automatic groove processing method for membrane panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically forming a groove for welding on an end of a pipe constituting a membrane panel when welding and joining a membrane panel constituting a water cooling wall of a boiler by an automatic device. On how to make it work properly.

[0002]

2. Description of the Related Art A membrane panel used for a water-cooled wall of a boiler is formed by welding and joining tubes and fins by a multi-electrode panel welding device to form a long rectangular panel having a width of 2 to 3 m and a length of 14 to 17 m. Molded. For this reason, depending on the position, there is a possibility that the pitch of the tubes in the panel is not uniform and the cross section of the tubes is deformed.

[0003] Conventionally, when an operator performs cutting by manually operating a tool, the cutting can be performed while visually checking the pipe. Therefore, even if the pipe is deformed or the pipe is displaced, the cutting can be performed. Also, even if the inner diameter chuck is moved in the axial direction, it can be easily followed, so that no particular problem occurs.

[0004] However, the conventional method of assembling the membrane panel and assembling the members and performing the cutting process for forming the groove by relying on the skill of a skilled operator as in the prior art is problematic in terms of production efficiency. Therefore, in order to improve it, it is required that an automatic device such as a robot performs beveling.

[0005] In order to cope with such a situation, the pitch of the tubes in the panel and the deformation of the cross section of the tubes are controlled.
For example, it has been proposed to detect the position of a pipe by a three-dimensional laser sensor or the like, and to perform processing by arranging a groove processing tool at an end of a pipe to be cut based on the detected position.

[0006]

However, this method can accurately detect the position when the tube is not largely deformed, but when the tube is deformed, In addition, it is difficult to correct small errors based on this.In addition, the inner chuck inserted into the pipe does not evenly contact the inner surface of the pipe, causing the entire chuck to move deeper in the pipe. It is not possible to sufficiently cope with a problem that there is a possibility that an accurate groove processing portion may not be obtained due to a deviation of a feed from a predetermined position.

[0007] The present invention has been made in view of such circumstances, and has a simple configuration to always perform accurate groove preparation in response to the displacement of the tube of the membrane panel or the deformation of the tube. It is an object to provide an automatic beveling method for a membrane panel that enables it.

[0008]

The above object is achieved by a method for automatically grooving a membrane panel according to the present invention. That is, in a membrane panel of a welding structure consisting of a plurality of tubes through which a heat medium flows and flat fins arranged between the tubes and connecting adjacent tubes, an inner diameter chuck, a floating head, Is mounted on the head of a beveling machine operated by an automatic device, the inner diameter chuck has a lock member that moves forward and backward in opposite axial directions at both ends in the axial direction, and each lock member has an opposing surface. A tapered wedge member which is rotatably supported by a pin on the outer peripheral portion in the radial direction on the side thereof so as to be swingable by a pin, and the tip end portion of which is slidably fitted to a lock member disposed opposite thereto via an inclined surface. When the wedge member and the inclined surface for slidably fitting the tip of the wedge member are equally divided in a plurality of locations in the circumferential direction, when performing groove processing of the tube of the membrane panel, , The pre-filled seat The beveling machine is positioned in the pipe to be machined by an automatic device based on the above, and the floating head is inserted into the pipe to be cut accurately at the center position by absorbing a small positional error, and the inner diameter chuck driving means opposes The wedge members attached to the respective lock members are moved in the direction in which the lock members are arranged closer to each other, and the inclined portions of the respective lock members are opposed to each other. Pressed into the gap between the inner surface of the pipe to be cut located in the part,
The inner diameter chuck is pressed in a direction perpendicular to the axis by a locking member and a wedge member in opposite directions in the axial direction, thereby suppressing the cutting machine from moving to any side in the axial direction of the pipe, This is an automatic beveling method for a membrane panel in which beveling of a membrane tube is performed by an automatic device.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS On a water-cooled wall of a boiler, dozens of rectangular panels each having a width of 2 to 3 m and a length of 14 to 17 m manufactured by a fully automatic process are manufactured by welding and joining. Before joining each other, the ends of the tubes constituting each panel need to be grooved for welding.

In the membrane panel, long pipes and fins are arranged side by side and joined by welding, so that internal stress is released when the member is cut after forming the panel, so that the pitch of the pipes in the groove processing portion is not necessarily constant. In addition to being not held, the pipes may spread or narrow, and it may be difficult for the end faces of the pipes to maintain a perfect circular shape in all the pipes, and may often be deformed into an elliptical shape.

Conventionally, an operator holds a tool by hand, fixes the position with an inner diameter chuck, and confirms the size and shape by visual inspection. Since the inner chuck had a structure as shown in FIG. 2, the lock member 51 of the inner chuck was brought into contact with only a small-diameter portion of the deformed tube based on the deformation of the tube,
Even if the inner diameter chuck moves in the axial direction of the pipe due to the small frictional resistance, it is possible to adjust the position of the tool accordingly to form a predetermined groove.

However, in the case where the operation is automatically performed by a robot, simply operating the robot based on a predetermined size often does not allow the tool to be accurately adapted to the pipe to be processed. In the present invention, the floating head is attached to the tip of the groove processing machine, and is positioned in the pipe to be processed and inserted into the pipe.

Since the tip of the floating head can freely move in the direction perpendicular to the axis of the tube, even if an error occurs in the position of the tube, the error can be easily displaced to enter the tube. I do.

An inner diameter chuck according to the present invention is attached to a portion near the tip of the groove processing machine that has entered the pipe. FIG. 1 is a diagram showing an outline of the chuck. FIG.
Here, 1 is a lock member, 2 is a wedge member, 3 is a pin,
4 is an inclined surface.

The inner diameter chuck is provided with a lock member 1 that moves forward and backward in opposite axial directions at both ends in the axial direction. In each of the lock members 1, a root portion is pivotally supported by a pin 3 on a radially outer peripheral portion on a surface side opposed to the lock member 1, and a distal end portion is formed on the lock member 1 disposed opposite thereto. The tapered wedge member 2 that slides and fits on the inclined surface 4 is provided.

The wedge member 2 and the inclined surface 4 into which the tip of the wedge member 2 is slidably fitted are formed at a plurality of positions in the circumferential direction, for example, at six equally-divided positions.

When the groove processing of the pipe of the membrane panel is performed, the groove processing machine is positioned at the opening end of the pipe to be processed by an automatic device based on the coordinates inputted in advance.
The floating head is operated to insert the inner diameter chuck into the pipe to be cut. Since the floating head has a structure that can be freely displaced in the radial direction of the tube, even if the position of the opening of the tube deviates from the predetermined coordinates, it can absorb the error and quickly and accurately At the center of the tube.

After confirming that the groove processing machine is at a predetermined position,
The lock members 1 disposed opposite to each other are moved in a direction approaching each other by an inner diameter chuck driving unit (not shown). A wedge member 2 attached to each lock member 1 based thereon is provided with an inclined portion 4 of each lock member 1 disposed opposite thereto, and an inner surface of a pipe to be cut located at an outer peripheral portion of the inclined portion 4 (see FIG. (Not shown), and the inner diameter chuck firmly holds its position by being pressed in a direction perpendicular to the axis by the lock members 1 and the wedge members 2 which are opposite in the axial direction.

Thereby, the cutting machine does not move to any side in the axial direction of the pipe, and a predetermined position is secured.
In a stable state, the groove processing of the membrane tube can be performed by the automatic device.

[0020]

According to the present invention, the following effects can be obtained. In other words, each time a beveling process is performed, the core is checked and held for each pipe to be cut, and a reaction force acts on the beveling machine at the time of the beveling process. Cutting can be performed accurately without cutting, and since there is no shift in the axial direction, it is possible to reduce the influence of errors on cutting feed.

[Brief description of the drawings]

FIG. 1 is a view showing an outline of an inner diameter chuck based on the present invention.

FIG. 2 is a diagram showing an outline of a conventional inner diameter chuck.

[Explanation of symbols]

 Reference Signs List 1 lock member 2 wedge member 3 pin 4 inclined surface 51 lock member 52 wedge member 53 fixing member

Continuing from the front page (72) Inventor Chiaki Ito 1 Shinhama-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Heavy Industries, Ltd. Chiba Plant (72) Inventor Shinji Kawashima 4-4-7 Minamishinagawa, Shinagawa-ku, Tokyo (58) Field surveyed (Int.Cl. ⁶ , DB name) B23C 3/12

Claims (1)

(57) [Claims] 1. A membrane panel having a welding structure including a plurality of tubes through which a heat medium flows, and a flat fin disposed between the tubes and connecting adjacent tubes, wherein an inner diameter chuck; The floating head is mounted on a head portion of a groove processing machine operated by an automatic device, wherein the inner diameter chuck has a lock member that moves forward and backward in opposite axial directions at both ends in the axial direction. A root portion is pivotally supported by a pin at the outer peripheral portion in the radial direction on the opposing surface side, and a tip portion is tapered to slide and fit into the opposing lock member via an inclined surface. A wedge member is provided, and the wedge member and an inclined surface for slidably fitting the tip end portion of the wedge member are equally divided in a plurality of places in a circumferential direction, and a groove processing of a tube of the membrane panel is performed. When inputting Based on the coordinates, the beveling machine is positioned in the pipe to be machined by the automatic device, the floating head is absorbed into the pipe to be cut, and the minute position error is absorbed and accurately inserted into the center position. Moving the lock members arranged opposite to each other in a direction approaching each other, based on which, a wedge member attached to each lock member is provided with an inclined portion of each lock member arranged opposite, and the inclined portion Is pushed into the gap between the inner surface of the pipe to be cut and the inner surface of the pipe to be cut, and the inner diameter chuck is pressed in a direction perpendicular to the axis by a locking member and a wedge member which are in opposite directions in the axial direction. An automatic device for forming a groove of a membrane tube by an automatic device while being prevented from moving to any side in the axial direction of the membrane panel. Previous processing methods.