Internal support device for butt welding of cylindrical parts

Abstract

An internal support device for butt-joint annular seam welding of cylindrical parts comprises a stepped shaft, a lower flange, a support ring, an expansion block, a copper strip, a top ring, an upper flange and a screw cap; the lower flange and the support ring are positioned on the stepped shaft; the expansion block is formed into an annular expansion block by butt-jointing five arc-shaped expansion petals, wherein the two butt-jointing surfaces of one arc-shaped expansion petal are inclined surfaces, and the outer peripheral side of each arc-shaped expansion petal is provided with a groove, and each groove is inlaid with a copper strip, the annular expansion block is arranged on the surface of the support ring, the outer peripheral side of the top ring is embedded in the inner hole of the annular expansion block, the top ring is fixedly connected to the support ring, the upper flange is sleeved on the end of the stepped shaft, the upper flange and the lower flange are respectively used to position two butt-joint cylinders to be welded, and the screw cap is screwed on the end of the stepped shaft to tighten the upper flange after assembly. The present invention can realize the precise positioning of the circular cylinder during butt-joint annular seam argon arc welding, and ensure that the cylinder does not deform during the welding process.

Description

Technical Field

[0001] The invention relates to a cylindrical parts butt-jointed argon arc annular seam welding device, and more particularly to an internal supporting device for cylindrical parts butt-jointed argon arc annular seam welding. Background Art

[0002] When butt welding cylindrical parts, it is necessary to accurately position the welding position before pre-welding. However, it is very easy to cause misalignment when butt welding cylindrical parts, resulting in deviation in the straightness of the parts after welding. When welding the circumferential seam, it will cause partial collapse of the welding position, affecting the overall forming of the parts. If the three-claw chuck of the circumferential seam welding machine directly clamps the parts, it will cause scratches on the surface of the parts. Summary of the invention

[0003] The present invention overcomes the shortcomings of the prior art and provides an internal support device for butt-jointed annular seam welding of cylindrical parts. The device can realize accurate positioning of butt-jointed annular seam argon arc welding of cylindrical parts and support the inside of the parts to ensure that the parts do not deform during welding.

[0004] The internal support device for butt-jointed annular seam welding of cylindrical parts comprises a stepped shaft, a lower flange, a support ring, an expansion block, a copper strip, a top ring, an upper flange and a screw cover; the lower flange and the support ring are positioned on the stepped shaft; the expansion block is formed into an annular expansion block by butt-jointing five arc-shaped expansion petals, wherein the two butt-jointing surfaces of one arc-shaped expansion petal are inclined surfaces, a groove is formed on the outer peripheral side surface of each arc-shaped expansion petal, a copper strip is embedded in each groove, the annular expansion block is arranged on the surface of the support ring, the outer peripheral side surface of the top ring is embedded in the inner hole of the annular expansion block, the top ring is fixedly connected to the support ring, the upper flange is sleeved on the end of the stepped shaft, the upper flange and the lower flange are respectively used to position two butt-jointed cylinders to be welded, and the screw cover is screwed on the end of the stepped shaft to tighten the upper flange after assembly.

[0005] Compared with the prior art, the present invention has the following beneficial effects:

[0006] 1. The internal support device for cylinder argon arc annular seam welding of the present invention can support the inside of the cylinder butt weld. The design of the copper bar can increase the heat conduction rate and reduce welding deformation. The design of the expansion block plays a supporting role, which can reduce the depression of the cylinder during welding and improve the forming rate of the product.

[0007] 2. The present invention has a simple structure and is easy to operate. The step shaft and expansion block of the present invention can improve the coaxiality of two sections of butt-jointed cylinders. The coaxiality deviation after welding using the device is less than 0.05 mm.

[0008] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments: BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is the overall structure diagram of the present invention;

[0010] Figure 2 is along Figure 1 Sectional view along line AA;

[0011] Figure 3 It is a structural diagram of a stepped shaft;

[0012] Figure 4 yes Figure 2 A top view of

[0013] Figure 5 It is the front view of the lower flange;

[0014] Figure 6 yes Figure 2 A top view of

[0015] Figure 7 It is the front view of the upper flange;

[0016] Figure 8 yes Figure 7 A top view of

[0017] Fig. 9 It is the front view of the screw cap;

[0018] Fig.10 is along Fig. 9 Sectional view along the midline BB;

[0019] Fig.11 It is a schematic diagram of a ring made of 5 copper bars;

[0020] Fig.12 yes Fig.11 Side view of

[0021] Fig.13 It is a schematic diagram of a ring-shaped expansion block formed by splicing five expansion petals;

[0022] Fig.14 yes Fig.13 Side view of

[0023] Fig.15 is the front view of the support ring;

[0024] Fig.16 yes Fig.15 A top view of

[0025] Fig.17 It is the front view of the top ring;

[0026] Fig.18 yes Fig.17 Top view of the . DETAILED DESCRIPTION

[0027] See also Figure 1-Figure 18As shown, the cylindrical parts butt-jointed annular seam welding internal support device of this embodiment comprises a stepped shaft 1, a lower flange 2, a support ring 3, a bulging block 4, a copper bar 5, a top ring 6, an upper flange 7 and a screw cover 8;

[0028] A lower flange 2 and a support ring 3 are positioned on the stepped shaft 1; the expansion block 4 is formed by five arc-shaped expansion petals connected to form an annular expansion block, wherein the two connecting surfaces of one arc-shaped expansion petal are inclined surfaces, and a groove 4-1 is opened on the outer peripheral side of each arc-shaped expansion petal, and a copper strip 5 is embedded in each groove 4-1. The annular expansion block is arranged on the surface of the support ring 3, and the outer peripheral side of the top ring 6 is embedded in the inner hole of the annular expansion block. The top ring 6 is fixedly connected to the support ring 3, and the upper flange 7 is sleeved on the end of the stepped shaft 1. The upper flange 7 and the lower flange 2 are respectively used to position the two connecting cylinders, and the screw cover 8 is screwed on the end of the stepped shaft 1 to tighten the upper flange 7 after assembly.

[0029] The upper flange 7 and the lower flange 2 are used to clamp the two cylinders. The arc-shaped expansion flap 4-0 is inlaid with a copper strip. The copper strip 5 is made of brass. The thermal conductivity of brass is much greater than that of steel, which can accelerate the conduction of welding heat and reduce the deformation of the welded cylinder. Figure 11-Figure 12 As shown, an arc-shaped groove 5-1 is formed on the outer peripheral side of each copper strip 5, so that the back side of the weld has a better forming effect.

[0030] like Fig.13 As shown, the arc-shaped expansion petals are designed to be five petals, and the angles β between the two butt surfaces of one arc-shaped expansion petal and the center line of the annular expansion block are 20°-30°. The other expansion blocks are placed first, and the arc-shaped expansion petal with the inclined surface is placed last. After the arc-shaped expansion petal 4-0 with the inclined surface is struck with a wooden hammer, its two inclined surfaces can expand and tighten the other arc-shaped expansion petals. A lot of heat is generated during argon arc welding. Experiments have shown that if the expansion block is designed to be 2 petals, 3 petals, and 4 petals, serious deformation will occur after welding, affecting the subsequent use of the expansion petals. The cutting of the copper strip 5 corresponds to the cutting of the expansion block, such as Fig.11 and Fig.13 5 cutting lines on the torus.

[0031] Optionally, the copper bar 5 is embedded in the groove 4-1, and the copper bar 5 and the groove 4-1 are interference fit, and the copper bar 5 is embedded in the groove 4-1 and cannot be loose, thereby ensuring that the copper bar 5 is firm and stable and has good heat conduction.

[0032] like Figure 1 , Figure 5 and Figure 6 As shown, the upper flange 7 is a stepped flange, the small diameter section of the upper flange 7 is inserted into the cylinder to be welded, and the cylinder to be welded is against the large diameter end face of the upper flange 7. Figure 1 , Figure 7 and Figure 8As shown, the lower flange 2 is a stepped flange, and the small diameter section of the lower flange 2 is inserted into the inner body of the cylinder to be welded, and the cylinder to be welded rests on the large diameter end face of the lower flange 2. The upper flange 7 and the small diameter section of the lower flange 2 are used to locate the two ends of the cylinder to be welded. The outer diameter of the large diameter end of the flange should be larger than the inner diameter of the cylinder to be welded, and is used to support the cylinder. The end of the stepped shaft 1 is processed with threads, and the thread size matches the screw cover 8. The screw cover 8 is used to tighten the whole body so that the two cylinders to be welded do not move with the rotation of the support device when they are welded. After the upper flange 7 is assembled, it is used to tighten the support device as a whole so that the cylinder to be welded does not move in the axial direction during the welding process.

[0033] The outer diameter of the top ring 6 is the same as the inner hole of the annular expansion block, and is used to support the arc expansion petal 4-0. After the expansion block 4 is clamped, the top ring 6 fixes the position of the arc expansion petal 4-0 to ensure that the arc expansion petal 4-0 does not move during the welding process. The top ring 6 is connected to the support ring 3 through screws 9. Three threaded holes are designed on the top ring 6 and are positioned on the support ring 3 through screws 9 to clamp the arc expansion petal 4-0 so that the arc expansion petal 4-0 is tightly matched with the joint of the cylinder to be welded.

[0034] Working process: insert the lower flange 2 onto the stepped shaft 1, with the small diameter end of the lower flange 2 facing upward, and the large diameter end of the stepped shaft 1 resting on the first step at the bottom; then insert the support ring 3 onto the stepped shaft and rest it on the second step; install a cylinder to be welded and rest it on the large diameter end face of the lower flange 2, install the five arc-shaped expansion petals on the support ring 3 to form an annular expansion block, and finally tighten the support ring 3 with a wooden hammer, and the top ring 6 is embedded in the inner hole of the support ring 3, and the top ring 6 and the support ring 3 are tightened with screws 9; insert the other cylinder to be welded onto the stepped shaft 1, and then insert the upper flange 7 onto the stepped shaft 1, insert the small diameter end of the upper flange 7 into the cylinder to be welded, tighten the nut 8, so that the two cylinders to be welded are butt-jointed together and do not rotate in the axial direction.

[0035] The supporting device carrying the butt-welding cylinder is placed on the argon arc girth welder, the three-claw chuck clamps the large diameter section of the stepped shaft 1, and the welding gun is aimed at the butt weld of the cylinder to perform welding.

[0036] The present invention has been disclosed as above with preferred implementation cases, but it is not used to limit the present invention. Any technician familiar with the profession can make slight changes or modifications to equivalent implementation cases with equivalent changes by using the above-disclosed structures and technical contents without departing from the scope of the technical solution of the present invention, which still fall within the scope of the technical solution of the present invention.

Claims

1. An internal support device for butt welding of cylindrical parts, characterized in that: It comprises a stepped shaft (1), a lower flange (2), a support ring (3), a bulging block (4), a copper bar (5), a top ring (6), an upper flange (7) and a screw cover (8); A lower flange (2) and a support ring (3) are positioned on the stepped shaft (1); the lower flange (2) abuts against the first step of the stepped shaft (1), and the support ring (3) abuts against the second step of the stepped shaft (1); the expansion block (4) is formed by five arc-shaped expansion petals (4-0) butted together to form an annular expansion block, wherein two butting surfaces of one arc-shaped expansion petal are inclined surfaces, and a groove (4-1) is formed on the outer peripheral side of each arc-shaped expansion petal, and a copper strip (5) is embedded in each groove (4-1), and the copper strip (5) and the groove (4-1) are connected to each other. -1) interference fit, the outer side surface of each copper strip (5) is provided with an arc-shaped groove (5-1), the annular expansion block is arranged on the surface of the support ring (3), the outer side surface of the top ring (6) is embedded in the inner hole of the annular expansion block, the top ring (6) is fixedly connected to the support ring (3), the upper flange (7) is sleeved on the end of the stepped shaft (1), the upper flange (7) and the lower flange (2) are respectively used to position two butt-jointed cylinders to be welded, and the screw cover (8) is screwed on the end of the stepped shaft (1) to tighten the upper flange (7) after assembly.

2. According to claim 1, the internal support device for butt welding of cylindrical parts is characterized by: The upper flange (7) is a stepped flange. The small diameter section of the upper flange (7) is inserted into the cylinder to be welded, and the cylinder to be welded abuts against the large diameter end surface of the upper flange (7).

3. The internal support device for butt-welding annular seams of cylindrical parts according to claim 2 is characterized in that: The lower flange (2) is a stepped flange. The small diameter section of the lower flange (2) is inserted into the cylinder to be welded, and the cylinder to be welded abuts against the large diameter end face of the lower flange (2).

4. The internal support device for butt-welding annular seams of cylindrical parts according to claim 3 is characterized in that: The angles (β) between the two butt joint surfaces of one of the arc-shaped expansion petals and the center line of the annular expansion block are 20°-30°.

5. The internal support device for butt-welding annular seams of cylindrical parts according to claim 4, characterized in that: The top ring (6) is connected to the support ring (3) via screws (9).

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