A flame preheating lance

Abstract

This application discloses a flame preheating spray gun, relating to the field of pipeline welding technology. It includes a base with a support bracket, and an air inlet pipe. The air inlet pipe has an arc-shaped nozzle mounting plate with several flame nozzles communicating with the inner cavity of the air inlet pipe. The nozzle mounting plate has mounting holes for installing the flame nozzles. The support includes a telescopic rod and a telescopic sleeve. The telescopic sleeve has a fixing rod, and the telescopic rod has several fixing holes for the fixing rod to pass through and insert into. Before preheating large pipelines, a nozzle mounting plate matching the curvature of the pipeline's outer wall is selected, and the flame nozzles are fixed at equal intervals along the extension direction of the nozzle mounting plate. By replacing multiple independent flame spray guns with flame nozzles arranged in a straight line, the problem of significant differences in preheating levels in different areas is improved.

Description

Technical Field

[0001] This application relates to the field of pipe welding technology, and in particular to a flame preheating spray gun. Background Technology

[0002] As the core device of the flame thermal spraying process, the flame spray gun controls the temperature of the combustion flame by adjusting the mixing ratio of fuel gases such as oxygen and acetylene with compressed air, while simultaneously regulating the feed speed of the sprayed material. It is widely used in the field of corrosion protection and repair of outdoor steel structure components, as well as in special processing scenarios that require high-temperature heat sources.

[0003] In current large-scale pipeline welding operations, when performing preheating treatment before welding two pipelines, the pipelines must first be placed on a rolling device and adjusted to ensure that the joint ends of the two pipelines fit precisely. Then, multiple independent flame torches are fixed to the side of the joint gap between the two pipelines. After ensuring that the nozzles are at a reasonable distance from the preheating area, the rolling device is started to drive the pipeline to rotate at a uniform speed to achieve the preheating treatment of the pipeline.

[0004] Regarding the aforementioned technologies, the inventors believe that in the preheating operation of existing flame torches, the independent flame nozzles are prone to radial displacement when preheating the circumferential welds of large pipelines, resulting in uneven flame coverage, local heat superposition or insufficiency, and a large difference in the degree of preheating in different areas of the pipeline. Utility Model Content

[0005] The purpose of this application is to provide a flame preheating spray gun to improve the problem of large differences in the preheating degree in different areas.

[0006] The flame preheating spray gun provided in this application adopts the following technical solution:

[0007] A flame preheating spray gun includes a base, a bracket provided on the base, an air inlet pipe provided on the bracket, an arc-shaped nozzle mounting plate provided on the air inlet pipe, a plurality of flame nozzles communicating with the inner cavity of the air inlet pipe, and mounting holes for mounting the flame nozzles provided on the nozzle mounting plate.

[0008] By adopting the above technical solution, before preheating large pipelines, a nozzle mounting plate that matches the curvature of the outer wall of the pipeline is selected, and the flame nozzles are fixed on it at equal intervals along the extension direction of the nozzle mounting plate. By replacing the original multiple independent flame guns with flame nozzles arranged in the same straight line, the problem of large differences in the degree of preheating in different areas can be improved.

[0009] Optionally, the bracket is provided with a fixed plate, and a rotating plate is rotatably mounted on the fixed plate and fitted therewith. The rotating plate is connected to the air intake pipe. The rotating plate is provided with a plurality of positioning screws, and the fixed plate is provided with an arc-shaped rotating groove. The positioning screws pass through the rotating groove and are provided with positioning nuts, which can abut against the fixed plate.

[0010] By adopting the above technical solution, the connection state between the fixed plate and the rotating plate is changed by adjusting the mating depth of the positioning nut and the positioning screw. When the positioning nut does not abut against the fixed plate, the positioning screw can slide in the rotating groove to adjust the deflection angle of the nozzle mounting bracket. When the positioning nut abuts against the fixed plate, the fixed plate and the rotating plate are locked together to fix the current deflection angle of the nozzle mounting bracket.

[0011] Optionally, the positioning screw is provided with a metal washer, which is located between the positioning nut and the fixing plate.

[0012] By adopting the above technical solution, the metal gasket provides a larger contact area when the positioning nut presses against the fixing plate. This not only prevents the corners of the positioning nut from contacting the rotating groove and causing damage when it rotates, but also reduces the contact stress of the positioning nut on the fixing plate, thereby protecting the components.

[0013] Optionally, the positioning nut is provided with several extension plates.

[0014] By adopting the above technical solution, the extension plate on the positioning nut allows workers to adjust the engagement depth between the positioning nut and the positioning screw by manually turning the extension plate without using a torque wrench, which facilitates quick adjustment of the deflection angle of the nozzle mounting plate.

[0015] Optionally, the bracket includes a telescopic rod and a telescopic sleeve, the telescopic sleeve is provided with a fixed insertion rod, and the telescopic rod is provided with a plurality of fixing holes for the fixed insertion rod to pass through and be inserted.

[0016] By adopting the above technical solution, the telescopic rod and telescopic sleeve of the bracket are connected by a sleeve structure, with the telescopic sleeve fitted onto the outside of the telescopic rod. The height of the bracket can be adjusted by inserting the fixing rod into fixing holes at different heights on the telescopic sleeve, thereby controlling the vertical position of the nozzle mounting plate.

[0017] Optionally, the telescopic sleeve is provided with a fixing seat, and the fixing seat is provided with a fixing slot for inserting the fixing rod.

[0018] By adopting the above technical solution and adding a fixing seat, the fixing rod passes through the fixing hole and forms a plug-in connection with the fixing slot, thereby further enhancing the connection stability between the fixing rod and the fixing hole and ensuring the reliable fixing effect of the fixing rod.

[0019] Optionally, the fixing slot is provided with an elastic ring, and the fixing rod is provided with an engaging groove that can engage with the elastic ring.

[0020] By adopting the above technical solution, an elastic ring is set in the fixed slot, so that it forms a locking structure with the locking groove on the fixed rod; when the fixed rod is inserted into the fixed slot, the elastic ring is squeezed and deformed until it is locked into the locking groove, thereby locking the fixed rod.

[0021] Optionally, the fixing rod is provided with a guide radius.

[0022] By adopting the above technical solution, the guide chamfer at the end of the fixed plug facilitates its insertion into the fixed slot and compresses the elastic ring. This rounded corner structure reduces the insertion resistance of the fixed plug. When it is necessary to release the locking of the elastic ring and the locking groove, a greater force than that applied during insertion is required to ensure the locking stability of the fixed plug.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. Before preheating large pipelines, select a nozzle mounting plate that matches the curvature of the outer wall of the pipeline, and fix the flame nozzles at equal intervals along the extension direction of the nozzle mounting plate. By replacing the original multiple independent flame guns with flame nozzles arranged in the same straight line, the problem of large differences in the preheating degree of different areas can be improved.

[0025] 2. By adjusting the fit depth between the positioning nut and the positioning screw, the connection state between the fixed plate and the rotating plate is changed; when the positioning nut does not abut against the fixed plate, the positioning screw can slide in the rotating groove to adjust the deflection angle of the nozzle mounting bracket; when the positioning nut abuts against the fixed plate, the fixed plate and the rotating plate are locked together, fixing the current deflection angle of the nozzle mounting bracket.

[0026] 3. The extension plate on the positioning nut allows workers to adjust the engagement depth between the positioning nut and the positioning screw by manually turning the extension plate without using a torque wrench, facilitating quick and easy adjustment of the nozzle mounting plate's deflection angle. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a flame preheating spray gun structure;

[0028] Figure 2 yes Figure 1 Enlarged view of section A;

[0029] Figure 3 It is a schematic diagram used to illustrate the positional relationship between the telescopic rod, telescopic sleeve, and fixed insertion rod;

[0030] Figure 4 yes Figure 3 Enlarged view of section B in the middle.

[0031] In the diagram, 1. Base; 11. Air inlet pipe; 12. Flame nozzle; 13. Nozzle mounting plate; 14. Mounting hole; 2. Bracket; 21. Telescopic rod; 22. Telescopic sleeve; 23. Fixed insertion rod; 24. Fixed hole; 25. Fixed slot; 26. Elastic ring; 27. Engaging groove; 28. Guide rounded corner; 29. ​​Fixed seat; 3. Fixed plate; 31. Rotating plate; 32. Positioning screw; 33. Rotating groove; 34. Positioning nut; 35. Metal washer; 36. Extension plate. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail below.

[0033] A flame preheating spray gun, as shown in the reference Figure 1 It includes a horizontal base 1, a bracket 2 fixedly mounted on the base 1 by welding, an air intake pipe 11 in the shape of a hollow square strip at the end of the bracket 2 away from the base 1, and a fixing plate 3 fixedly mounted on the bracket 2 by welding. The fixing plate 3 is a triangular plate with rounded edges.

[0034] Reference Figure 1 and Figure 2 The fixed plate 3 is rotatably provided with a rotating plate 31 that fits against it. The rotating plate 31 is fixedly connected to the air intake pipe 11 by welding. The rotating plate 31 is provided with a number of positioning screws 32, which pass through the rotating plate 31 from the side away from the fixed plate 3.

[0035] Reference Figure 1 and Figure 2 The fixed plate 3 is provided with an arc-shaped rotating groove 33. The positioning screw 32 passes through the rotating groove 33 and is provided with a positioning nut 34. The positioning screw 32 is in contact with the inner side wall of the rotating groove 33. By adjusting the cooperation relationship between the positioning nut 34 and the positioning screw 32, the positioning nut 34 can abut against the fixed plate 3. In this embodiment, the number of positioning screws 32 is preferably two. By changing the cooperation depth between the positioning nut 34 and the positioning screw 32, the connection state between the fixed plate 3 and the rotating plate 31 is changed. When the positioning nut 34 is not abutting against the fixed plate 3, the positioning screw 32 can slide in the rotating groove 33 and rotate to adjust the relative position of the rotating plate 31 and the fixed plate 3.

[0036] Reference Figure 1An arc-shaped nozzle mounting plate 13 is fixedly installed on the air intake pipe 11 via a threaded connection. The nozzle mounting plate 13 is provided with a plurality of flame nozzles 12 that communicate with the inner cavity of the air intake pipe 11. The nozzle mounting plate 13 is provided with mounting holes 14 for threaded connection and fixed installation of the flame nozzles 12. After the gas supply pipe is connected to the air intake pipe 11, it extends to the position where it communicates with the nozzle mounting plate 13. The gas supply pipe is guided to the corresponding mounting hole 14 through the diverter pipe to provide an equal amount of gas to each flame nozzle 12. In this embodiment, the flame nozzles 12 are cylindrical, and the number of flame nozzles 12 is preferably 3. The flame nozzles 12 are arranged in a straight line on the nozzle mounting plate 13 to improve the problem of large differences in the preheating degree of different areas.

[0037] Reference Figure 1 and Figure 2 The positioning screw 32 is provided with a metal washer 35, which is located between the positioning nut 34 and the fixing plate 3. In this embodiment, the metal washer 35 is in the shape of a circular plate, and the material of the metal washer 35 is preferably spring steel.

[0038] Reference Figure 1 and Figure 2 The positioning nut 34 is fixedly provided with several extension plates 36 by welding. In this embodiment, the extension plates 36 are square plates, and the number of extension plates 36 is preferably two. Workers can easily and quickly adjust the deflection angle of the nozzle mounting plate 13 relative to the bracket 2 by manually moving the extension plates 36.

[0039] Reference Figure 1 and Figure 3 The bracket 2 includes a rectangular telescopic rod 21 and a hollow square telescopic sleeve 22. The telescopic sleeve 22 is provided with a round rod-shaped fixing rod 23. The telescopic rod 21 is provided with a plurality of fixing holes 24 for the fixing rod 23 to pass through and be inserted. In this embodiment, the number of fixing holes 24 is preferably 6. The height of the nozzle mounting plate 13 is adjusted according to the selection of the fixing rod 23 and the fixing holes 24 so that the nozzle mounting plate 13 can be adapted to more types of pipes.

[0040] Reference Figure 3 The telescopic sleeve 22 is fixedly mounted with a block-shaped fixing seat 29 by welding. The fixing seat 29 is provided with a fixing slot 25 for the fixing rod 23 to be inserted. After the fixing rod 23 passes through the fixing hole 24, it is inserted and fixed with the fixing slot 25, thereby further enhancing the connection stability between the fixing rod 23 and the fixing hole 24 and ensuring the reliable fixing effect of the fixing rod 23.

[0041] Reference Figure 3 and Figure 4The fixing slot 25 is provided with an annular elastic ring 26, and the fixing rod 23 is provided with a locking groove 27 that can engage with the elastic ring 26. In this embodiment, the elastic ring 26 is preferably made of rubber. After the fixing rod 23 is inserted into the fixing slot 25, the elastic ring 26 engages and is fixed with the locking groove 27, further strengthening the stability of the fixing rod 23 and the fixing slot 25.

[0042] Reference Figure 3 and Figure 4 The end of the fixed rod 23 that is inserted into the fixed slot 25 is provided with a rounded guide chamfer 28. The guide chamfer facilitates the compression of the elastic ring 26. The insertion resistance of the fixed rod 23 makes the insertion force much less than the force required to release the locking between the fixed rod 23 and the fixed slot 25, thus ensuring the stable locking of the fixed rod 23.

[0043] The implementation principle of this application embodiment is as follows:

[0044] After selecting a nozzle mounting plate 13 that matches the curvature of the outer wall of the preheating pipe, install the flame nozzles 12, adjust the height of the bracket 2 and the deflection angle of the nozzle mounting plate 13 to keep the flame nozzles 12 aligned in a straight line, and ensure that the distance between each flame nozzle 12 and the outer wall of the pipe is similar, thereby improving the problem of large differences in the preheating degree in different areas.

[0045] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A flame preheating spray gun, comprising a base (1), wherein the base (1) is provided with a bracket (2), and the bracket (2) is provided with an air inlet pipe (11); characterized in that: The air intake pipe (11) is provided with an arc-shaped nozzle mounting plate (13), the nozzle mounting plate (13) is provided with a plurality of flame nozzles (12) connected to the air intake pipe (11), and the nozzle mounting plate (13) is provided with mounting holes (14) for mounting the flame nozzles (12).

2. The flame preheating spray gun according to claim 1, characterized in that: The bracket (2) is provided with a fixing plate (3), and the fixing plate (3) is rotatably provided with a rotating plate (31) that fits against it. The rotating plate (31) is connected to the air intake pipe (11). The rotating plate (31) is provided with a plurality of positioning screws (32). The fixing plate (3) is provided with an arc-shaped rotating groove (33). The positioning screws (32) pass through the rotating groove (33) and are provided with positioning nuts (34). The positioning nuts (34) can abut against the fixing plate (3).

3. The flame preheating spray gun according to claim 2, characterized in that: The positioning screw (32) is provided with a metal washer (35), which is located between the positioning nut (34) and the fixing plate (3).

4. The flame preheating spray gun according to claim 3, characterized in that: The positioning nut (34) is provided with several extension plates (36).

5. The flame preheating spray gun according to claim 1, characterized in that: The bracket (2) includes a telescopic rod (21) and a telescopic sleeve (22). The telescopic sleeve (22) is provided with a fixed insertion rod (23). The telescopic rod (21) is provided with a plurality of fixing holes (24) for the fixed insertion rod (23) to pass through and be inserted.

6. The flame preheating spray gun according to claim 5, characterized in that: The telescopic sleeve (22) is provided with a fixed seat (29), and the fixed seat (29) is provided with a fixed slot (25) for the fixed rod (23) to be inserted.

7. The flame preheating spray gun according to claim 6, characterized in that: The fixing slot (25) is provided with an elastic ring (26), and the fixing rod (23) is provided with a locking groove (27) that can engage with the elastic ring (26).

8. The flame preheating spray gun according to claim 7, characterized in that: The fixed insert (23) is provided with a guide radius (28).

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