Solder strip preheating device of strip surfacing welding gun

Abstract

The invention discloses a welding strip preheating device of a strip surfacing welding gun. The device comprises a strip surfacing machine head, flux hoppers, a welding strip and a contact tube, a preheating device is arranged below the strip surfacing machine head, the welding strip vertically and downwards enters a gap between a fixed heat insulation plate and an adjustable heat insulation plate of the preheating device along the contact tube of the strip surfacing machine head, and the flux hoppers are arranged on the two sides of the lower end of the preheating device; a connecting plate, a fixed thermal insulation plate, an adjustable thermal insulation plate and a cover plate of the preheating device are sequentially arranged in the transverse direction. And the connecting plate and the cover plate are fixedly connected with the strip surfacing machine head. The device has the beneficial effects that the structural design is reasonable, the operation is easy, the dry extension length of the welding strip can be effectively increased, the welding strip is effectively preheated by utilizing resistance heat of the dry extension part of the welding strip, the cladding speed of the welding strip in unit current is obviously improved, and the surfacing speed is improved; the purposes of reducing welding line energy, increasing the cooling speed of a surfacing layer, reducing the dilution rate of base metal and improving the mechanical properties and metallographic structures of the surfacing layer and a heat affected zone are achieved.

Description

Technical Field

[0001] The invention relates to a strip electrode cladding device, in particular to a welding strip preheating device of a strip electrode cladding welding gun, and belongs to the technical field of mechanical engineering fusion welding. Background Art

[0002] In the existing strip electrode cladding welding gun, ordinary plate electrodes are used. The welding strip passes through two plate electrodes. The normal welding strip dry extension length is adopted. The dry extension length of submerged arc strip electrode cladding is generally between 20 and 35 mm. The ordinary plate electrode has a simple structure, compact size, and mature application; however, this ordinary plate electrode has high line energy, low welding strip deposition efficiency, and the parent material dilution rate is generally greater than 20%. Therefore, this ordinary plate electrode strip electrode cladding process is suitable for high line energy and low speed welding, but not for low line energy and high speed welding. Summary of the invention

[0003] In order to overcome the disadvantage that the common plate-shaped electrodes used in the existing strip electrode cladding devices are not suitable for low-line energy and high-speed welding, the present invention provides a welding strip preheating device for a strip electrode cladding welding gun.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a welding strip preheating device for a strip electrode cladding welding gun, comprising a strip electrode cladding head, a flux hopper, a welding strip, and a conductive nozzle, and is characterized in that: a preheating device is arranged below the strip electrode cladding head, the welding strip enters the preheating device vertically downward along the conductive nozzle of the strip electrode cladding head, the welding strip enters downward into the gap between the fixed heat insulation plate and the adjustable heat insulation plate of the preheating device, and the flux hopper is arranged on both sides of the lower end of the preheating device.

[0005] The connection plate, fixed heat insulation plate, adjustable heat insulation plate and cover plate of the preheating device are arranged in sequence along the transverse direction; the connection plate and the cover plate are fixedly connected to the strip electrode cladding machine head.

[0006] The fixed heat-insulating plate is fixedly connected to the connecting plate; the adjustable heat-insulating plate is connected to the cover plate.

[0007] The two flux hoppers are respectively arranged on the outer sides of the connecting plate and the cover plate.

[0008] The outer sides of the connecting plate and the cover plate are respectively provided with flux hopper connecting devices; the flux hopper connecting devices are connected to the connecting plate / cover plate through connecting bolts, and the connecting bolts are provided with insulating sleeves to insulate the flux hopper connecting plate, the flux hopper and the strip electrode cladding machine head.

[0009] Two insulating sleeves I with stepped outer circles are arranged between the flux hopper connecting plate and the connecting plate / cover plate on the connecting bolt; the small shaft ends of the two insulating sleeves I are arranged facing each other, and the small shaft outer circle of the insulating sleeve I is provided with a sleeve.

[0010] An insulating sleeve II is arranged between the connecting bolt and the flux bucket connecting plate; the two insulating sleeves I and II are axially connected in sequence.

[0011] The adjustable heat-insulating plate is connected to the cover plate through adjusting bolts and adjusting nuts.

[0012] The side surface of the adjustable heat-insulating plate is provided with a T-shaped slot, and the gap between the adjustable heat-insulating plate and the fixed heat-insulating plate is adjusted by adjusting the nut.

[0013] The fixed heat-insulating board and the adjustable heat-insulating board are insulating mica boards.

[0014] The beneficial effects of the present invention are that the structural design is reasonable and easy to operate, and the dry extension length of the weld strip can be effectively increased. The resistance heat of the dry extension part of the weld strip can be used to effectively preheat the weld strip, which can significantly increase the melting speed of the weld strip per unit current and increase the surfacing speed, thereby achieving the purpose of reducing the welding line energy, increasing the cooling speed of the surfacing layer, reducing the dilution rate of the parent material, and improving the mechanical properties and metallographic structure of the surfacing layer and the heat affected zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a welding strip preheating device of a strip electrode cladding welding gun of the present invention.

[0016] Figure 2 It is a schematic diagram of the connection of the adjustable heat-insulating panels in the present invention.

[0017] Figure 3 It is a structural schematic diagram of the flux hopper connecting device in the present invention.

[0018] In the figure: 1. Strip electrode cladding head, 2. Connecting plate, 3. Fixed heat insulation plate, 4. Adjustable heat insulation plate, 5. Cover plate, 6. Flux bucket connecting device, 7. Flux bucket, 8. Welding strip, 9. Preheating device, 10. Insulating sleeve I, 11. Sleeve, 12. Flux bucket connecting plate, 13. Insulating sleeve II, 14. Connecting bolt, 15. Adjusting bolt, 16. Adjusting nut, 17. Conductive nozzle, 18. Frame. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. However, those skilled in the art should be aware that the present invention is not limited to the specific embodiments listed, and all embodiments should be included in the protection scope of the present invention as long as they conform to the spirit of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "left", "right", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing or simplifying the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", and "seal" should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection, a direct connection, an indirect connection, or an integral connection; it can be a mechanical connection, an indirect connection through an intermediate medium, or a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] See attached Figure 1 . The present invention discloses a welding strip preheating device for a strip electrode cladding welding gun, comprising a strip electrode cladding head 1, a flux hopper 7, and a welding strip preheating device 9. The preheating device 9 is arranged below the strip electrode cladding head 1, and the welding strip 8 enters the preheating device 9 vertically downward along the conductive nozzle 17 of the strip electrode cladding head 1, and the welding strip 8 enters downward into the gap between the fixed thermal insulation board 3 and the adjustable thermal insulation board 4, and two flux hoppers 7 are arranged on both sides of the lower end of the preheating device 9. Preferably, the fixed thermal insulation board 3 and the adjustable thermal insulation board 4 are insulating mica boards. The welding strip 8 between the fixed thermal insulation board 3 and the adjustable thermal insulation board 4 is the increased part of the dry extension of the welding strip. The fixed thermal insulation board 3 and the adjustable thermal insulation board 4 adopt wear-resistant, high-temperature resistant, insulating mica board as the straightener of the large dry extension welding strip to ensure that the large dry extension welding strip and the conductive nozzle 17 are reliably aligned. The resistance of the dry extension length of the welding strip also increases accordingly, and the heat generated by the resistance is used to achieve the purpose of preheating the welding strip.

[0023] The preheating device 9 includes a connecting plate 2, a fixed heat-insulating plate 3, an adjustable heat-insulating plate 4, a cover plate 5, and a flux hopper connecting device 6. The connecting plate 2, the fixed heat-insulating plate 3, the adjustable heat-insulating plate 4, and the cover plate 5 are arranged in sequence along the horizontal direction; the connecting plate 2 and the cover plate 5 are connected to the strip electrode cladding head 1, and preferably, the connecting plate 2 and the cover plate 5 are fixedly connected to the frame 18 of the strip electrode cladding head 1.

[0024] See attached Figure 2 , 3. The fixed thermal insulation plate 3 is fixedly connected to the connecting plate 2; the adjustable thermal insulation plate 4 is connected to the cover plate 5. The adjustable thermal insulation plate 4 is connected to the cover plate 5 by means of an adjusting bolt 15 and an adjusting nut 16. Preferably, a T-slot is provided on the side adjacent to the adjustable thermal insulation plate 4 and the cover plate 5, and one end of the adjusting bolt 15 is provided on the side provided with a T-slot, and the adjusting bolt 15 passes through the cover plate 5, and the gap between the adjustable thermal insulation plate 4 and the fixed thermal insulation plate 3 is adjusted by the adjusting nut 16, which can not only meet the requirements of welding strips of different thicknesses, but also ensure that the welding strip can be fed smoothly and smoothly without bending and deformation, thereby solving the problem of unstable welding strip delivery under large dry elongation conditions.

[0025] The flux hopper 7 is respectively arranged on the outer sides of the connecting plate 2 and the cover plate 5 (such as Figure 1 As shown in the figure, the outer sides of the connecting plate 2 and the cover plate 5 are respectively provided with flux hopper connecting devices 6; the two flux hopper connecting devices 6 are respectively connected to the connecting plate 2 / cover plate 5 by connecting bolts 14, and the connecting bolts 14 are perpendicular to the connecting plate 2 / cover plate 5. The connecting bolts 14 are provided with insulating sleeves to insulate the flux hopper connecting plate 12, the flux hopper 7 and the strip electrode overlay welding head 1. Furthermore, the flux hopper 7 is fixedly connected to the flux hopper connecting plate 12 by bolts, and the flux hopper 7 moves with the strip electrode overlay welding head 1 to ensure a stable supply of flux and ensure the continuity and stability of the additive manufacturing process.

[0026] The connecting bolt 14 is provided with two insulating sleeves I10 and one insulating sleeve II13, and the outer circles of the insulating sleeves I10 and II13 are both stepped shaft-shaped.

[0027] Two insulating sleeves I10 are arranged between the flux hopper connecting plate 12 and the connecting plate 2 / cover plate 5 on the connecting bolt 14; the small shaft ends of the two insulating sleeves I10 are arranged facing each other, and the small shaft outer circle of the insulating sleeve I10 is provided with a sleeve 11. An insulating sleeve II13 is arranged between the connecting bolt 14 and the flux hopper connecting plate 12. The two insulating sleeves I10 and the insulating sleeve II13 are connected in sequence axially.

[0028] The present invention discloses a welding strip preheating device for a strip electrode overlay welding gun, which is installed at the outlet of a conventional strip electrode overlay welding machine head electrode (conductive nozzle). The welding strip extends from the outlet of the electrode into the gap between a fixed heat insulation plate and an adjustable heat insulation plate, and can effectively increase the length of the welding strip extending from the outlet of the electrode. As the length of the welding strip increases, the resistance increases accordingly, and the extended portion of the welding strip is preheated, thereby improving the welding strip deposition efficiency, and achieving the effect of reducing the welding line energy by increasing the strip electrode deposition speed and the overlay welding speed or reducing the welding current without increasing the welding heat input, thereby increasing the cooling speed of the overlay welding layer, reducing the dilution rate of the base material, and improving the mechanical properties and metallographic structure of the overlay welding layer and the heat affected zone. The present invention is applicable to a variety of welding methods, such as submerged arc welding, electroslag welding and other consumable electrode welding methods.

[0029] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the claims of this patent.

Claims

1. A welding strip preheating device for a strip welding gun, comprising a strip welding head, a flux hopper, a welding strip, and a conductive nozzle, characterized in that: A preheating device is arranged below the strip electrode cladding welding machine head. The welding strip enters the preheating device vertically downward along the conductive nozzle of the strip electrode cladding welding machine head, and then enters downward into the gap between the fixed heat insulation plate and the adjustable heat insulation plate of the preheating device. The flux hopper is arranged on both sides of the lower end of the preheating device.

2. The welding strip preheating device of the strip electrode cladding welding gun according to claim 1 is characterized in that: The connecting plate, the fixed heat-insulating plate, the adjustable heat-insulating plate and the cover plate of the preheating device are arranged in sequence in the transverse direction; the connecting plate and the cover plate are fixedly connected to the strip electrode cladding machine head.

3. The welding strip preheating device of the strip electrode cladding welding gun according to claim 2 is characterized in that: The fixed heat-insulating plate is fixedly connected to the connecting plate; the adjustable heat-insulating plate is connected to the cover plate.

4. The welding strip preheating device of the strip electrode cladding welding gun according to claim 3 is characterized in that: The two flux hoppers are respectively arranged on the outer sides of the connecting plate and the cover plate.

5. The welding strip preheating device of the strip electrode cladding welding gun according to claim 4 is characterized in that: The outer sides of the connecting plate and the cover plate are respectively provided with flux hopper connecting devices; the flux hopper connecting devices are connected to the connecting plate / cover plate through connecting bolts, and the connecting bolts are provided with insulating sleeves to insulate the flux hopper connecting plate, the flux hopper and the strip electrode cladding machine head.

6. The welding strip preheating device of the strip electrode cladding welding gun according to claim 5 is characterized in that: Two insulating sleeves I with stepped outer circles are arranged between the flux hopper connecting plate and the connecting plate / cover plate on the connecting bolt; the small shaft ends of the two insulating sleeves I are arranged facing each other, and the small shaft outer circle of the insulating sleeve I is provided with a sleeve.

7. The welding strip preheating device of the strip electrode cladding welding gun according to claim 6 is characterized in that: An insulating sleeve II is arranged between the connecting bolt and the flux bucket connecting plate; the two insulating sleeves I and II are axially connected in sequence.

8. The welding strip preheating device of the strip electrode cladding welding gun according to claim 3 is characterized in that: The adjustable heat-insulating plate is connected to the cover plate through adjusting bolts and adjusting nuts.

9. The welding strip preheating device of the strip electrode cladding welding gun according to claim 8 is characterized in that: The side surface of the adjustable heat-insulating plate is provided with a T-shaped slot, and the gap between the adjustable heat-insulating plate and the fixed heat-insulating plate is adjusted by adjusting the nut.

10. The welding strip preheating device of the strip electrode cladding welding gun according to claim 1 is characterized in that: The fixed heat-insulating board and the adjustable heat-insulating board are insulating mica boards.

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