All welded plate heat exchanger fixture

All welded plate heat exchanger fixture

Made in full and welded plate heat exchanger, the plate beam welding is an important link to ensure the quality of equipment, the plate thickness is less than 1 mm is chosen mostly beam of austenitic stainless steel sheet stamping into plate of compound and into.In the welding process is a brief burn through, such as deformation and weld forming bad questions.About the length of more than 2 000 mm weld, so is more difficult to eliminate the disadvantages of the.Main factors affecting the quality of plate beam welding plate, punching deformation, fault clearance between edge and the cutting burr, etc.To eliminate these risks, we must progress the positioning accuracy of the jig.In this paper, a kind of accurate positioning and convenient since the positioning operation fast loading fixture.

1.Structure and principle of

In the selection of laser welding, TIG or MIG welding welding method of high automation degree, degree of automation of jig request also follow the progress.In most cases the end choose pneumatic, hydraulic or electric element control power to progress.Long seam welding, the plate’s initial scale is tough, and requests about some special molding board piece, the traditional jig is very difficult to satisfy the request, such as shape for gathering the ball bubble, because of space constraints, pneumatic and hydraulic clamp in the direction of the weld length of precise complex operation, high request to the workers’ operation skill, weld repair rate is high.Figure 1 is the author for the welding and welded plate heat exchanger production of medium plate beam design of special fixture, the fixture is made up of top board, under the guide bush, conical guide pin, guide sleeve and the press table, etc.This set of tooling choose conical guide pin

Since end positioning, on the cone type guide pillar and guide sleeve within the cavity is equipped with a small spring, spring to clamp down on the end positioning buffer, to avoid impact on board formation damage, spring can make tooling flexible alignment, do the positioning.In order to ensure the accuracy of positioning, in the middle of the upper and lower pressure plate also has 3 with plate forming shape completely the same as the small module, to constraint plate relative displacement.So just make sure it is 4 conical guide pin positioning, plate can be precise positioning.Its positioning accuracy for 6 000 mm in length on the wrong side of less than 0. 1 mm.

plate heat exchanger

The card and replace panels, will be on board with the crane to lift, stay plate positioning in the future, crane controlled by dynamic method, put down the top board, four conical guide pillar and guide sleeve with one end can be installed under the card, each card takes less than 1 min, card process short, high power.When lifting with the light and maintainable tooling quality strong nylon rope.

2 features

(1) maintain plate beam, high weld quality welding when the welding some outstretched jig 1. 5 mm, choose in near weld parts and tooling data different QT42210, avoid welding welding slag splash in the beam and plate, at the same time also can scatter heat swiftly after welding, reducing heat affected zone, and avoid the deformation of the plate beam.Because of very high positioning precision tooling, in the case of welding standard suitable weld without burning through, bite edge and molding bad picture, after molding, plate beam all the deformation is small.(2) paid less, good interchangeability because jig in use process will not receive a big load, so the fixture big some choose Q2352A production, in the near weld parts selection and plate corrugated iron strip.With respect to the manner of different corrugated plate, fixture structure, only on the basis of corrugated way replace cast iron strip and small module and pressure molding.So for 1 set of structure, can end a variety of standard plate welding.(3) construct a brief, good stiffness, good production technical fixture of a complete set of no special structure, also does not have the big parts, construct a brief, choose truss in principle, in the middle of the two main layering with Angle steel with triangular tectonic facies welding jig stiffness, ensure the jig in the process of using deformation.Can all or subsection welding structure, and then all the processing.

3 conclusion

Dealt with all this set of fixture and welded plate heat exchanger plate beam positioning is not accurate, in the process of welding seam quality is poor, clamp not interchangeability and produce power low level question.In a high degree of automation, the investment is small but it can end precision positioning, under the condition of progress of power.

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