CN201324765Y

CN201324765Y - Internal expanded pipe spreader

Info

Publication number: CN201324765Y
Application number: CNU2008202154714U
Authority: CN
Inventors: 范凯
Original assignee: Wuxi Huaguang Boiler Co Ltd
Current assignee: Wuxi Huaguang Boiler Co Ltd
Priority date: 2008-12-03
Filing date: 2008-12-03
Publication date: 2009-10-14
Anticipated expiration: 2018-12-03

Abstract

The utility model provides an internal expanded pipe spreader which can greatly reduce the technological allowance of a tube in spiral finned tube processing, reduce the subsequent processing procedure of the finned tube, increase the working efficiency and lower the manufacturing cost. The internal expanded pipe spreader comprises a sleeve, an inner pull rod, an expansion block and an elastic ring; wherein the sleeve includes a pipe connection part and an expansion combining part; the inner pull rod sleeve is arranged inside the sleeve; a sliding groove is arranged along the circumferential direction on the expansion combining part of the sleeve; the expansion block is embedded in the sliding groove; the elastic ring is arranged at the periphery of the expansion combining part of the sleeve.

Description

A kind of inner expansion type tube extension device

(1) technical field

The utility model relates to tube extension frock field, is specially a kind of inner expansion type tube extension device.

(2) background technology

In the spiral fin coil process, because apparatus for production line structure and welding operating mode need, fin coiling welding position need leave the above space length of 200mm far between pipe clamping rotation walking unit head, pipe clamping Len req 100mm in addition, to every spiral fin coil, add all require man-hour pipe winding end portion to rise apart from helical fin must not be around the distance of weld less than 350mm, and on the spiral fin coil product structure of producing, pipe winding end portion rises around the weld distance apart from helical fin and mostly is 110mm greatly, for this reason, conventional production method is to increase the above technology length of 250mm on every spiral fin coil product structure length, process allowance is removed after the coiling welding is finished again.Though this technology mode can satisfy the production status needs, guaranteed the spiral fin coil crudy, manufacturing procedure increases, and the tubing consumption increases, the manufacturing cost height.

(3) summary of the invention

At the problems referred to above, the utility model provides a kind of inner expansion type tube extension device, and the pipe process allowance length that it can reduce in the spiral fin coil processing significantly reduces finned tube following process operation, has improved work efficiency, has reduced manufacturing cost.

Its technical scheme is such, it is characterized in that: it comprises sleeve, draw-in bar, expanding block and elastic collar, described sleeve comprises takes over part and swelling bound fraction, described draw-in bar is placed in described sleeve inner, described sleeve swelling bound fraction is along circumferentially having sliding tray, described expanding block is embedded in the described sliding tray, and described elastic collar is placed in described sleeve swelling bound fraction periphery.

It is further characterized in that: described draw-in bar is the oblique cone structure at the swelling binding site of described sleeve; Be connected and fixed by locking nut between described draw-in bar and the described sleeve; Described sliding tray is provided with five; Described expanding block is provided with five; The adapter part external diameter of described sleeve is identical with finned tube external diameter to be processed; It is step surface with described swelling bound fraction junction that described sleeve is taken over part; Preset clearance between described draw-in bar periphery and the described sleeve lining; Described sleeve is taken over part surface and is had the unit head holding tank.

Use the inner expansion type tube extension device of the utility model structure, its beneficial effect is: under the prerequisite of guaranteeing the reliable processing of spiral fin coil, reduce the pipe process allowance length in the spiral fin coil processing significantly, reduce product materials, reduce finned tube following process operation, improve work efficiency, reduced manufacturing cost.

(4) description of drawings

Fig. 1 is a main TV structure schematic diagram of the present utility model;

Fig. 2 is that the A-A of Fig. 1 is to cutaway view;

Fig. 3 is that the B-B of Fig. 1 is to cutaway view;

Fig. 4 is the oblique cone structural representation for described draw-in bar at the swelling binding site of described sleeve.

(5) specific embodiment

See Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the utility model comprises sleeve, draw-in bar 1, expanding block 2 and elastic collar 3, sleeve comprises takes over part 4 and swelling bound fraction 5, draw-in bar 1 is placed in sleeve inner, sleeve swelling bound fraction 5 is along circumferentially having sliding tray, expanding block 2 is embedded in the sliding tray, and elastic collar 3 is placed in sleeve swelling bound fraction 5 peripheries.Draw-in bar 1 is the oblique cone structure at swelling bound fraction 5 places of sleeve; Be connected and fixed by locking nut 7 between draw-in bar 1 and the sleeve; Sliding tray is provided with five; Expanding block 2 is provided with five; Adapter part 4 external diameters of sleeve are identical with finned tube external diameter to be processed; It is step surface with swelling bound fraction 5 junctions that sleeve is taken over part 4, and this step surface is the assembling seam locating surface 8 that sleeve is taken over part 4 and finned tube; Preset clearance between draw-in bar 1 periphery and the sleeve lining; Sleeve is taken over part 4 surfaces and is had unit head holding tank 6.

Wherein, the width of expanding block 2 can be adjusted according to the finned tube of different structure, and handle through roughening on its surface, utilizes and the contact-making surface size variation control of product finned tube and the adhesion of finned tube; The effect of elastic collar 3 is to prevent that expanding block 2 breaks away from the sleeve sliding tray and expanding block 2 can be limited in sleeve inner under off working state; Unit head holding tank 6 surfaces are all passed through roughening and are handled, and processing can improve its chucking power and unit head holding tank 6 is through surface roughening; Because the tube wall of spiral fin coil is generally thinner, interior chucking power is crossed conference and is caused the damage of retained part tube wall or produce distortion, preset clearance between draw-in bar 1 periphery and the sleeve lining utilizes the radial limits stroke of the piece that expands in the gap length control of sleeve and draw-in bar 1.

When the utility model uses, according to different finned tube pipe specifications, select the extension device of corresponding specification and the piece combination of expanding, when assembling with the finned tube pipe end, earlier locking nut 7 is unscrewed, draw-in bar 1 is moved to the right in sleeve inner, because draw-in bar 1 is the oblique cone structure at sleeve swelling bound fraction 5 places, expanding block 2 collapses in the sleeve swelling bound fraction 5 under elastic collar 3 effects, sleeve swelling bound fraction 5 is inserted in the finned tube, assembling seam locating surface is adjacent to the finned tube port, be clamped on sleeve unit head holding tank 6 with clamp, locking nut 7 is screwed, draw-in bar 1 is moved to the left in sleeve inner, utilize oblique cone structure that draw-in bar 1 is positioned at sleeve swelling bound fraction 5 places with expanding block 2 along the circumferentially evenly expansion and be close to the finned tube inwall of its sliding tray, check then whether assembling seam locating surface 8 is adjacent to the finned tube port, whether the sleeve cylindrical aligns with the finned tube cylindrical, after the concentricity of guaranteeing tube extension device and finned tube locking nut 7 usefulness small wrench are continued to be threaded to revolve substantially motionless till, again according to the operate as normal program of coiling finned tube, the boxing spiral fin coil.

The utility model is except that the production and processing that is used for spiral fin coil, can further be extended in the bending machining technology of pipe, significantly reduce the bent tube technique surplus that tube bending plays the curved section of curved section and end, enlarge the territory of cost efficiency, improve the technology level.

Claims

1, a kind of inner expansion type tube extension device, it is characterized in that: it comprises sleeve, draw-in bar, expanding block and elastic collar, described sleeve comprises takes over part and swelling bound fraction, described draw-in bar is placed in described sleeve inner, described sleeve swelling bound fraction is along circumferentially having sliding tray, described expanding block is embedded in the described sliding tray, and described elastic collar is placed in described sleeve swelling bound fraction periphery.

2, according to the described a kind of inner expansion type tube extension device of claim 1, it is characterized in that: described draw-in bar is the oblique cone structure at the swelling binding site of described sleeve.

3, according to the described a kind of inner expansion type tube extension device of claim 1, it is characterized in that: be connected and fixed by locking nut between described draw-in bar and the described sleeve.

4, according to the described a kind of inner expansion type tube extension device of claim 1, it is characterized in that: described sliding tray is provided with five.

5, according to the described a kind of inner expansion type tube extension device of claim 1, it is characterized in that: described expanding block is provided with five.

6, according to the described a kind of inner expansion type tube extension device of claim 1, it is characterized in that: the adapter part external diameter of described sleeve is identical with finned tube external diameter to be processed.

7, according to the described a kind of inner expansion type tube extension device of claim 1, it is characterized in that: it is step surface with described swelling bound fraction junction that described sleeve is taken over part.

8, according to the described a kind of inner expansion type tube extension device of claim 1, it is characterized in that: preset clearance between described draw-in bar periphery and the described sleeve lining.

9, according to the described a kind of inner expansion type tube extension device of claim 1, it is characterized in that: described sleeve is taken over part surface and is had the unit head holding tank.