CN210817898U - Back face protection tool for inner hole welding - Google Patents
Back face protection tool for inner hole welding Download PDFInfo
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- CN210817898U CN210817898U CN201921583199.XU CN201921583199U CN210817898U CN 210817898 U CN210817898 U CN 210817898U CN 201921583199 U CN201921583199 U CN 201921583199U CN 210817898 U CN210817898 U CN 210817898U
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Abstract
The utility model relates to an inner hole welding back face protection tool, which relates to the field of welding and manufacturing heat exchange tubes of austenitic stainless steel inner hole welding heat exchangers, in particular to an inner hole welding back face protection tool, which comprises a hollow cylindrical protection sleeve sleeved outside a pipeline and one end of which is connected with a tube plate, wherein one end of the hollow cylindrical protection sleeve is provided with an annular gas baffle, the other end of the hollow cylindrical protection sleeve is provided with a ventilation structure, and the hollow cylindrical protection sleeve is connected with the tube plate through the ventilation structure; the utility model discloses simple structure, low in manufacturing cost, convenient to use utilizes cavity column protective sheath and sets up the airtight space that one serves annular gas baffle and pipeline to form at cavity column protective sheath to from ventilative structure outflow combination cavity column protective sleeve set up one of annular gas baffle serve be connected with a centre gripping locking device can be abundant for the austenite stainless steel is from melting formula tungsten utmost point gas shielded welding back protection provide stable, the inert gas protection space that the air current is stable.
Description
Technical Field
The utility model relates to an austenitic stainless steel internal hole welds heat exchanger heat exchange tube welding and makes the field, concretely relates to internal hole welds back protection frock.
Background
In recent years, petrochemical technology has developed rapidly, especially nitric acid plant technology. The low-pressure reaction water cooler equipment in the nitric acid device is made to be heavy, so as to prevent the scouring of the medium and the corrosion resistance. The connection mode of the tube plate at one end of the heat exchanger and the heat exchange tube is designed to be a full-penetration type inner hole welding structure, and the material is S30403 austenitic stainless steel.
The full-penetration type inner hole welding structure is generally divided into two types of filling wire type gas tungsten arc welding and self-melting type gas tungsten arc welding according to the GB/T151-2011 requirements, and the welding mode of the current time is self-melting type gas tungsten arc welding. Because the welding adopts the non-filler wire type self-melting tungsten electrode gas protection structure, because of the welding particularity of austenitic stainless steel, when a full-penetration single-side welding and double-side forming structure is required, the back needs strict inert gas protection to ensure that a welding joint is not oxidized by air, and because of the limitation of the operation space of the structure, the space is smaller, and the common protection mode, such as a protection groove and a protection cover, is not suitable for the welding structure.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a high temperature resistant, easy operation possesses good heat conductivity, satisfies austenite stainless steel tungsten utmost point gas shielded arc welding back gas shielded arc shaping requirement, the stable back protection frock of interior pore-welding of shaping.
The utility model relates to an inner hole welding back face protection tool, which comprises a hollow cylindrical protective sleeve sleeved outside a pipeline and one end of which is connected with a tube plate, wherein one end of the hollow cylindrical protective sleeve is provided with an annular gas baffle, and the other end of the hollow cylindrical protective sleeve is provided with a ventilation structure;
the pipe joint is characterized in that one end, provided with the annular air baffle plate, of the hollow cylindrical protective sleeve is connected with a clamping and locking device, an air inlet hole is formed in the hollow cylindrical protective sleeve, an inflation air belt is connected to the air inlet hole, and the air inlet hole is communicated with the ventilation structure through a gap between the hollow cylindrical protective sleeve and the pipe.
Preferably, the hollow cylindrical protective sleeve comprises a semi-cylindrical concave protective sleeve and a semi-cylindrical convex protective sleeve, the concave protective sleeve and the convex protective sleeve are connected through a quick-release structure, and the central axis of the concave protective sleeve and the central axis of the convex protective sleeve after connection are on the same straight line.
Preferably, the quick release structure comprises two grooves arranged on the concave protective sleeve and two protrusions arranged on the convex protective sleeve, and the two grooves are respectively arranged at two ends of the concave protective sleeve in the circumferential direction;
the protruding setting is two, and two archs set up respectively on the both ends of protruding type protective sheath circumferential direction, concave type protective sheath upper groove sets up and matches continuously with protruding type protective sheath upper hump relatively.
Preferably, the distance between the groove and the outer circumferential surface and the distance between the groove and the inner circumferential surface of the concave protective sleeve are equal; the distance between the protrusion and the outer circumferential surface and the inner circumferential surface of the convex protective sleeve is equal.
Preferably, the distance between the groove and the outer peripheral surface of the concave protective sleeve is greater than the distance between the groove and the inner peripheral surface of the concave protective sleeve; the distance between the protrusion and the outer peripheral surface of the convex protective sleeve is larger than the distance between the protrusion and the inner peripheral surface of the convex protective sleeve.
Preferably, the distance between the groove and the outer peripheral surface of the concave protective sleeve is less than the distance between the groove and the inner peripheral surface of the concave protective sleeve; the distance between the protrusion and the outer peripheral surface of the convex protective sleeve is smaller than the distance between the protrusion and the inner peripheral surface of the convex protective sleeve.
Preferably, the hollow cylindrical protective sleeve is a hollow cylindrical protective sleeve.
Preferably, the diameter of the end of the hollow cylindrical protective sleeve provided with the air permeable structure is smaller than the diameter of the end of the hollow cylindrical protective sleeve connected with the annular air baffle.
Or preferably, the clamping and locking device comprises two clamping plates which are respectively a first clamping plate and a second clamping plate, one ends of the two clamping plates are respectively fixedly connected with the convex protective sleeve and the concave protective sleeve, the other ends of the two clamping plates are connected through the locking device, and the two clamping plates are arranged in parallel;
the locking device comprises a distance tube and a locking screw rod, one end of the distance tube is fixedly connected with the first clamping plate, and the other end of the distance tube extends out towards the second clamping plate;
a limiting nut is fixedly arranged on the locking screw rod, a locking nut is fixedly arranged in the distance tube, the central axis of the locking nut and the central axis of the distance tube are on the same straight line, and one end of the locking screw rod penetrates through the second clamping plate and then extends into the distance tube arranged towards the second clamping plate and is in threaded connection with the locking nut in the distance tube;
the second clamping plate is sleeved on a locking lead screw between the limiting nut and the distance tube, and the central axis of the locking lead screw is perpendicular to the plane where the two clamping plates are located.
Preferably, the ventilation structure comprises sawtooth-shaped protrusions which are arranged at the end part of the hollow cylindrical protection sleeve and are arranged along the axial direction of the hollow cylindrical protection sleeve, triangular gaps formed between adjacent sawteeth are ventilation holes, and the side length of each ventilation hole is 6 mm.
The utility model discloses simple structure, low in manufacturing cost, convenient to use utilizes cavity column protective sheath and sets up the airtight space that one served annular gas baffle and pipeline formed at cavity column protective sheath to from ventilative structure outflow combination cavity column protective sleeve set up one of annular gas baffle serve be connected with a centre gripping locking device can be abundant for the austenite stainless steel is from melting formula tungsten utmost point gas shielded welding back protection provide stable, airtight good, the stable inert gas protection space of air current.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a usage state diagram of the present invention.
FIG. 3 is a schematic view of the hollow cylindrical protective sheath of FIG. 1 rotated 180 degrees about its central axis.
Reference numerals: the device comprises a 1-concave protective sleeve, a 2-convex protective sleeve, a 3-air inlet, a 4-inflation air belt, a 5-first clamping plate, a 6-distance tube, a 7-limiting nut, an 8-locking screw rod and a 9-second clamping plate.
Detailed Description
The utility model relates to an inner hole welding back face protection tool, which comprises a hollow cylindrical protective sleeve sleeved outside a pipeline and one end of which is connected with a tube plate, wherein one end of the hollow cylindrical protective sleeve is provided with an annular gas baffle, and the other end of the hollow cylindrical protective sleeve is provided with a ventilation structure;
the pipe fitting is characterized in that one end, provided with the annular air baffle plate, of the hollow cylindrical protective sleeve is connected with a clamping and locking device, an air inlet hole 3 is formed in the hollow cylindrical protective sleeve, an inflation air belt 4 is connected to the air inlet hole 3, and the air inlet hole 3 is communicated with the ventilation structure through a gap between the hollow cylindrical protective sleeve and the pipe.
The hollow cylindrical protective sleeve comprises a semi-cylindrical concave protective sleeve 1 and a semi-cylindrical convex protective sleeve 2, the concave protective sleeve 1 and the convex protective sleeve 2 are connected through a quick-release structure, and the central axis of the concave protective sleeve 1 and the convex protective sleeve 2 after being connected is on the same straight line.
The quick release structure comprises two grooves arranged on the concave protective sleeve 1 and two bulges arranged on the convex protective sleeve 2, and the two grooves are respectively arranged at two ends of the concave protective sleeve 1 in the circumferential direction;
the arch sets up to two, and two archs set up respectively on the both ends of 2 circumferential directions of protruding type protective sheath, concave type protective sheath 1 upper groove sets up and matches continuously with protruding relative setting on the protruding type protective sheath 2 that links to each other.
The distance between the groove and the outer circumferential surface and the inner circumferential surface of the concave protective sleeve 1 is equal; the distance between the projection and the outer circumferential surface and the inner circumferential surface of the convex protective sleeve 2 is equal.
The distance between the groove and the outer peripheral surface of the concave protective sleeve 1 is greater than the distance between the groove and the inner peripheral surface of the concave protective sleeve 1; the distance between the projection and the outer circumferential surface of the convex protective sleeve 2 is larger than the distance between the projection and the inner circumferential surface of the convex protective sleeve 2.
Preferably, the distance from the groove to the outer peripheral surface of the concave protective sleeve 1 is less than the distance from the groove to the inner peripheral surface of the concave protective sleeve 1; the distance between the projection and the outer circumferential surface of the convex protective sleeve 2 is smaller than the distance between the projection and the inner circumferential surface of the convex protective sleeve 2.
The hollow cylindrical protective sleeve is a hollow cylindrical protective sleeve.
The diameter of one end of the hollow cylindrical protective sleeve provided with the ventilation structure is smaller than that of one end of the hollow cylindrical protective sleeve connected with the annular gas baffle.
The clamping and locking device comprises two clamping plates, namely a first clamping plate 5 and a second clamping plate 9, one ends of the two clamping plates are fixedly connected with the convex protective sleeve 2 and the concave protective sleeve 1 respectively, the other ends of the two clamping plates are connected through the locking device, and the two clamping plates are arranged in parallel;
the locking device comprises a distance tube 6 and a locking screw 8, one end of the distance tube 6 is fixedly connected with the first clamping plate 5, and the other end of the distance tube 6 extends out towards the second clamping plate 9;
a limit nut 7 is fixedly arranged on the locking screw rod 8, a locking nut is fixedly arranged in the distance tube 6, the central axis of the locking nut and the central axis of the distance tube 6 are on the same straight line, and one end of the locking screw rod 8 penetrates through the second clamping plate 9 and then extends into the distance tube 6 arranged towards the second clamping plate 9 and is in threaded connection with the locking nut in the distance tube 6;
and the second clamping plate 9 is sleeved on a locking screw rod 8 between the limiting nut 7 and the distance tube 6, and the central axis of the locking screw rod 8 is vertical to the plane where the two clamping plates are located.
The ventilation structure comprises sawtooth-shaped protrusions which are arranged at the end part of the hollow cylindrical protection sleeve and are arranged along the axial direction of the hollow cylindrical protection sleeve, triangular gaps formed between every two adjacent sawteeth are ventilation holes, and the side length of each ventilation hole is 6 mm.
When the pipe fitting is used, the sawtooth-shaped protrusions on the hollow cylindrical protective sleeve are inserted into the stress release grooves in the pipe plate to achieve one end positioning of the hollow cylindrical protective sleeve, then the hollow cylindrical protective sleeve is sleeved on a pipeline, the annular gas baffle is used for achieving positioning of the other end of the hollow cylindrical protective sleeve, and finally the clamping and locking device is used for achieving positioning and clamping.
Whole cavity column protective sheath adopts the whole one-step processing of chromium zirconium copper rod to form, adopts the wire-electrode cutting to continue the deep processing after the processing finishes, and then makes spill protective sheath and convex protective sheath have perfect degree of contact, guarantees the effect of back gas protection.
The utility model discloses simple structure, low in manufacturing cost, convenient to use utilizes cavity column protective sheath and sets up the airtight space that one served annular gas baffle and pipeline formed at cavity column protective sheath to from ventilative structure outflow combination cavity column protective sleeve set up one of annular gas baffle serve be connected with a centre gripping locking device can be abundant for the austenite stainless steel is from melting formula tungsten utmost point gas shielded welding back protection provide stable, airtight good, the stable inert gas protection space of air current.
Claims (10)
1. The inner hole welding back protection tool comprises a hollow cylindrical protection sleeve sleeved outside a pipeline, wherein one end of the hollow cylindrical protection sleeve is connected with a tube plate;
the pipe fitting is characterized in that one end, provided with the annular air baffle plate, of the hollow cylindrical protective sleeve is connected with a clamping and locking device, an air inlet hole (3) is formed in the hollow cylindrical protective sleeve, an inflation air belt (4) is connected to the air inlet hole (3), and the air inlet hole (3) is communicated with an air permeable structure through a gap between the hollow cylindrical protective sleeve and a pipeline.
2. The back protection tool for bore welding according to claim 1, wherein the hollow cylindrical protection sleeve comprises a semi-cylindrical female protection sleeve (1) and a semi-cylindrical male protection sleeve (2), the female protection sleeve (1) and the male protection sleeve (2) are connected through a quick release structure, and central axes of the female protection sleeve (1) and the male protection sleeve (2) after being connected are on the same straight line.
3. The back protection tool for bore welding according to claim 2, wherein the quick release structure comprises two grooves arranged on the concave protective sleeve (1) and two protrusions arranged on the convex protective sleeve (2), and the two grooves are respectively arranged at two ends of the concave protective sleeve (1) in the circumferential direction;
the convex protection sleeve is characterized in that the number of the convex protection sleeve is two, the two convex protection sleeves are respectively arranged at two ends of the circumferential direction of the convex protection sleeve (2), and the concave protection sleeve (1) is provided with a groove which is opposite to and matched with the convex protection sleeve (2).
4. The inside-hole welding back protection tool according to claim 3, wherein the distance between the groove and the outer circumferential surface and the distance between the groove and the inner circumferential surface of the female protective sleeve (1) are equal; the distance between the protrusion and the outer circumferential surface and the inner circumferential surface of the convex protective sleeve (2) is equal.
5. The back protection tool for fillet weld according to claim 3, wherein the distance between the groove and the outer circumference of the female protective sheath (1) is greater than the distance between the groove and the inner circumference of the female protective sheath (1); the distance between the protrusion and the outer peripheral surface of the convex protective sleeve (2) is larger than the distance between the protrusion and the inner peripheral surface of the convex protective sleeve (2).
6. The back protection tool for fillet weld according to claim 3, wherein the distance from the groove to the outer circumferential surface of the female protective sheath (1) is less than the distance from the groove to the inner circumferential surface of the female protective sheath (1); the distance between the protrusion and the outer peripheral surface of the convex protective sleeve (2) is less than the distance between the protrusion and the inner peripheral surface of the convex protective sleeve (2).
7. The bore welding back face protection tooling of claim 6, wherein the hollow cylindrical protection sleeve is a hollow cylindrical protection sleeve.
8. The bore welding back protection tooling of claim 7, wherein the diameter of the end of the hollow cylindrical protection sleeve provided with the air permeable structure is smaller than the diameter of the end of the hollow cylindrical protection sleeve connected with the annular air baffle.
9. The back protection tool for the bore welding according to any one of claims 2 to 8, wherein the clamping and locking device comprises two clamping plates, namely a first clamping plate (5) and a second clamping plate (9), one ends of the two clamping plates are fixedly connected with the convex protective sleeve (2) and the concave protective sleeve (1) respectively, the other ends of the two clamping plates are connected through a locking device, and the two clamping plates are arranged in parallel;
the locking device comprises a distance tube (6) and a locking screw rod (8), one end of the distance tube (6) is fixedly connected with the first clamping plate (5), and the other end of the distance tube (6) extends towards the second clamping plate (9);
a limiting nut (7) is fixedly arranged on the locking screw rod (8), a locking nut is fixedly arranged in the distance tube (6), the central axis of the locking nut and the central axis of the distance tube (6) are on the same straight line, and one end of the locking screw rod (8) penetrates through the second clamping plate (9), extends into the distance tube (6) arranged towards the second clamping plate (9) and is in threaded connection with the locking nut in the distance tube (6);
and the second clamping plate (9) is sleeved on a locking lead screw (8) between the limiting nut (7) and the distance tube (6), and the central axis of the locking lead screw (8) is perpendicular to the plane where the two clamping plates are located.
10. The back protection tool for the bore welding according to claim 1, wherein the ventilation structure comprises saw-tooth protrusions arranged at the end of the hollow cylindrical protection sleeve and arranged along the axial direction of the hollow cylindrical protection sleeve, triangular gaps formed between adjacent saw teeth are ventilation holes, and the side length of each ventilation hole is 6 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921583199.XU CN210817898U (en) | 2019-09-23 | 2019-09-23 | Back face protection tool for inner hole welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921583199.XU CN210817898U (en) | 2019-09-23 | 2019-09-23 | Back face protection tool for inner hole welding |
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| Publication Number | Publication Date |
|---|---|
| CN210817898U true CN210817898U (en) | 2020-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921583199.XU Active CN210817898U (en) | 2019-09-23 | 2019-09-23 | Back face protection tool for inner hole welding |
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| CN (1) | CN210817898U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115229310A (en) * | 2022-08-23 | 2022-10-25 | 上海电气电站设备有限公司 | Inner hole high-melting-depth single-pass tungsten electrode gas shielded welding method |
-
2019
- 2019-09-23 CN CN201921583199.XU patent/CN210817898U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115229310A (en) * | 2022-08-23 | 2022-10-25 | 上海电气电站设备有限公司 | Inner hole high-melting-depth single-pass tungsten electrode gas shielded welding method |
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