JPS5897484A - Automatic welding device for membrane panel - Google Patents

Abstract

PURPOSE:To prevent relief owing to curving of membrane bars and to improve the accuracy of welding by constituting a titled device of a roll which exerts pressing force upon membrane bars, a moving welding device, and a pulling device for membrane bars. CONSTITUTION:A welder 5 which welds pipes 1 and membrane bars 2, and a press roll 7 which is exerted with pressing force by a pressurizing device 6 such as hydraulic cylinder are disposed in an automatic welding device 4. The roll 7 presses the bars 2 disposed alternately with the pipes 1 on a stand 8. The other end part of the bars 2 is connected to a pulling device 10 such as hydraulic cylinder so that during welding the respective membrane bars are exerted with tensile forces by a fixing device 8 and the device 10. In this state, the device 4 moves in an arrow direction while pressing the bars 2 with the roll 7. Thus the relief of the bars owing to their curving is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a membrane panel welding device, and more particularly to an automatic welding device that can effectively prevent lifting of a membrane bar interposed between tubes. For example, a water-cooled wall called a membrane panel is used on the furnace wall of a boiler to effectively recover the generated heat. This membrane panel is formed by interposing metal plates called membrane bars between a plurality of tubes arranged in parallel, and fixing them to membrane bar tubes by welding to form a single plate. FIG. 1 shows a membrane panel, l is a tube, 2 is a membrane bar interposed between each tube 1, and each tube 1 and membrane bar 2 are formed into one membrane panel by welding 3. FIG. 2 shows a welding method for forming membrane panels. The process is carried out while the membrane is gradually moved in one direction, but the coefficient of thermal expansion due to the heat generated by welding is different between the tube 1 and the membrane panel 2, and the membrane panel 2 is more susceptible to thermal stress. Due to the reason, the membrane bar was broken in the middle of welding! ) It bends and deforms as shown in No. 2b. For this reason, it is necessary to perform welding while extending the membrane bar 2 horizontally using a striking force, and usually special personnel are assigned to drive the membrane bar, which is not only uneconomical but also reduces welding accuracy. There's a problem.

An object of the present invention is to provide a welding device that eliminates the above-mentioned problems, prevents bending of a membrane bar in advance, improves welding accuracy, and saves labor through automatic welding.

In short, the present invention is an automatic welding device comprising a movable welding device having a roller and welder that applies a pressing force to a membrane bar, and a membrane bar separating device that applies a tensile force to the membrane bar.

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

In FIG. 3, reference numeral 4 denotes an automatic welding device, which includes a welder 5 for welding the pipe 1 and the membrane bar, and a pressurizing device 6 such as a hydraulic cylinder to apply a pressing force. A roller 7 is arranged, and the pressure roller 7 presses the membrane bars arranged alternately with the pipes 1 on the pedestal 8.

Next, 9 is a fixing device for fixing the membrane bar on the welding start end side. The other end of the membrane bar 2 is connected to a separating device 10 such as a hydraulic cylinder, and during welding, a tensile force is applied to each membrane bar by the fixing device 8 and the separating device 10. In the above state, the mobile welding device starts welding from the above-mentioned starting end and moves in the direction of the arrow while pressing the membrane bar with the pressing roller 7. During this time, even if the membrane bar attempts to bend M, the bending can be effectively prevented by the pressing force of the suppression roller 7 and the traction force of the separation device]0. Note that the reference numeral 11 is a rail for a mobile welding device.

By carrying out the present invention, it is possible to effectively prevent floating -I bends due to bending of the membrane bar during welding of membrane panels, and to improve welding accuracy.

In addition to preventing the membrane bar from lifting up, welding itself can be performed automatically, resulting in significant labor savings.

[Brief explanation of drawings]

FIG. 1 is a perspective partial view of a membrane panel, FIG. 2 is a side view of the membrane panel showing a conventional welding method, and FIG. 3 is a side view of a welding apparatus according to the present invention. 1...Pipe 2...Membrane bar 4...Moveable welding device 5...Welder 7...Press roller 8... ... Frame 9 ... Fixing device 10 ... Sorting device\, Figure 1

Claims (1)

[Claims] l. It is characterized by comprising a membrane bar fixing device disposed on a frame, a membrane bar separating device disposed at a position facing the fixing device, and a mobile welding device having a pressure roller and a welder for pressing the membrane bar. Membrane panel automatic welding equipment.