Positioning and gas protection device for welding inner holes of dense tube bundles in narrow space

Abstract

The utility model discloses a positioning and gas protection device for welding inner holes of dense tube bundles in narrow space, which comprises a first main body and a second main body, one side of the first main body is hinged with one side of the second main body, and the first main body comprises a vertical plate. According to the positioning and gas protection device for welding the inner holes of the dense tube bundles in the narrow and small space, a split type clamp is designed according to the sizes of the heat exchange tubes and the spacing size between the heat exchange tubes so as to meet the requirements for welding positioning and welding gas protection of the tube joints and the heat exchange tubes in the narrow and small space range, and a gas inlet pipeline is designed on the clamp; welding seam back argon filling protection can be conducted on a welding seam during welding, a window is formed in the clamp so that the welding process can be monitored conveniently, the clamp is compact in structure and convenient to operate, rigid pipe positioning, welding argon filling protection and welding process observation and monitoring can be achieved, the welding manufacturing difficulty is reduced, repeated use can be achieved after proper one-time adjustment, and the production cost is reduced. And the product welding quality and the production efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of positioning and protection for internal hole welding of tube bundles, and particularly relates to a positioning and gas protection device for internal hole welding of dense tube bundles in a narrow space. Background Technique

[0002] For some shell-and-tube heat exchange devices, the structural form is tube sheet (or header) + heat exchange tubes. A large number of short tube joints are distributed on one side surface of the tube sheet (or header). The distance between the tube joints is narrow. The connection mode between the tube joints and the heat exchange tubes is internal hole argon arc welding. However, during welding, it is not convenient to position the tube joints and the heat exchange tubes, and at the same time, during the welding process, it is impossible to fill argon for protection on the back of the weld, and it is also not convenient to observe the welding process. Therefore, we propose a positioning and gas protection device for internal hole welding of dense tube bundles in a narrow space to solve the above possible problems. Content of the Utility Model

[0003] The purpose of the utility model is to provide a positioning and gas protection device for internal hole welding of dense tube bundles in a narrow space in view of the deficiencies of the prior art, so as to solve the problems raised in the background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A positioning and gas protection device for internal hole welding of dense tube bundles in a narrow space, including a first main body and a second main body. One side of the first main body and the second main body is hinged. The first main body includes a vertical plate. A screw rod is hinged to the left side of the vertical plate, and a cushion block is arranged on the outer ring of one side of the screw rod. The left end of the screw rod is hinged with a handle. The first main body further includes a support plate. Ring-shaped protective gas cavities are respectively arranged on the mutually close sides of the right sides of the first main body and the second main body.

[0005] As a preferred technical solution of the utility model, an air inlet pipe penetrating and extending into the ring-shaped protective gas cavity opened in the first main body is installed on one side of the upper part of the first main body, and a valve is installed on the air inlet pipe.

[0006] As a preferred technical solution of the utility model, the ring-shaped protective gas cavities opened on the mutually close sides of the right sides of the first main body and the second main body will form a ring-shaped protective gas cavity after the first main body and the second main body are combined.

[0007] As a preferred technical solution of the utility model, a moving plate matching with the outer ring of the screw rod is arranged on the outer ring of one side of the screw rod, and springs surrounding the outer ring of the screw rod are fixedly installed on the mutually close sides of the moving plate and the cushion block.

[0008] As a preferred technical solution of the present utility model, grooves are provided on the left sides of both the support plate and the second main body, and one end of the screw rod is hinged to the inner walls on both sides of the groove provided on the support plate. The groove provided on the left side of the second main body is slightly larger than the outer circle of the screw rod.

[0009] As a preferred technical solution of the present utility model, the right side of the handle is in a U shape, and a fixing plate is installed inside the U shape on the right side of the handle through a pin. The screw rod penetrates through the fixing plate on the side away from the vertical plate, and a nut is provided on the outer circle of the end of the screw rod penetrating through the fixing plate.

[0010] As a preferred technical solution of the present utility model, an observation window is provided on the right side of the support plate, and glass is installed on the observation window. The first main body and the second main body clamp a half-coupling pipe.

[0011] As a preferred technical solution of the present utility model, the handle, the cushion block, the nut and the screw rod form an eccentric clamping device, adopting an eccentric wheel mechanism with a wheel diameter of φ25mm, an eccentricity of 1.2 - 2.2mm, and an eccentric wheel characteristic of about 5.6 - 10.4, which can achieve self-locking.

[0012] Compared with the prior art, the present utility model provides a positioning and gas protection device for internal hole welding of dense tube bundles in a narrow space, and has the following beneficial effects:

[0013] The positioning and gas protection device for internal hole welding of dense tube bundles in a narrow space is a split fixture designed according to the heat exchange tube size and the spacing size between heat exchange tubes to meet the welding positioning and welding gas protection requirements for pipe joints and heat exchange tubes within a narrow space range. An air inlet pipeline is designed on the fixture to perform argon backfilling protection on the weld during welding. Windows are opened on the fixture to facilitate monitoring of the welding process. The fixture has a compact structure and is easy to operate, can realize rigid positioning of the pipes, welding argon protection and observation and monitoring of the welding process, reduce the welding manufacturing difficulty, can be reused after being adjusted properly once, and improve the welding quality and production efficiency of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0015] Figure 2 It is a schematic diagram of the working principle structure of the present utility model;

[0016] Figure 3 It is a schematic diagram of the structure of the first main body of the present utility model;

[0017] Figure 4 It is a schematic diagram of the connection structure between the first main body and the second main body of the present utility model;

[0018] Figure 5Schematic top view structure of the first main body of the present utility model;

[0019] Figure 6 Schematic structure diagram of the observation window of the present utility model.

[0020] Reference numerals: 1, first main body; 2, second main body; 3, handle; 4, spring; 5, screw; 6, vertical plate; 7, cushion block; 8, valve; 9, intake pipe; 10, pin; 13, half pipe; 15, nut; 17, observation window; 18, glass; 19, support plate. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Please refer to Figures 1-6 , in this embodiment: A positioning and gas protection device for internal hole welding of dense tube bundles in a narrow space, including a first main body 1 and a second main body 2. One side of the first main body 1 and the second main body 2 is hinged, which can clamp and fix the pipeline to be welded. The first main body 1 includes a vertical plate 6. A screw 5 is hinged to the left side of the vertical plate 6, and a cushion block 7 is arranged on the outer ring of one side of the screw 5. The left end of the screw 5 is hinged with a handle 3, which can make the first main body 1 and the second main body 2 close or open. The first main body 1 also includes a support plate 19. Annular protection gas cavities are respectively opened on the mutually close sides of the right sides of the first main body 1 and the second main body 2. The arc-shaped inner surfaces of the first main body 1 and the second main body 2 are provided with arc-shaped grooves, and the grooves will form an annular protection gas cavity after the first main body 1 and the second main body 2 are combined, realizing full argon protection for the entire annular local area on the back of the weld during the welding process, preventing welding oxidation and improving welding quality.

[0023] In this embodiment, an intake pipe 9 is installed on one side of the upper part of the first main body 1, which penetrates and extends into the annular protective gas chamber opened in the first main body 1. A valve 8 is installed on the intake pipe 9. The annular protective gas chambers opened on the side where the right sides of the first main body 1 and the second main body 2 are close to each other will form an annular protective gas chamber after the first main body 1 and the second main body 2 are combined. A moving plate matching the outer circle of one side of the screw rod 5 is arranged, and springs 4 surrounding the outer circle of the screw rod 5 are fixedly installed on the sides where the moving plate and the cushion block 7 are close to each other. Grooves are opened on both the left side of the support plate 19 and the second main body 2, and one end of the screw rod 5 is hinged to the inner walls on both sides of the groove opened in the support plate 19. The groove opened on the left side of the second main body 2 is slightly larger than the outer circle of the screw rod 5. The right side of the handle 3 is U-shaped, and a fixing plate is installed inside the U-shaped part on the right side of the handle 3 through a pin 10. The screw rod 5 penetrates through the fixing plate on the side away from the vertical plate 6, and a nut 15 is arranged on the outer circle of the end of the screw rod 5 penetrating through the fixing plate. An observation window 17 is opened on the right side of the support plate 19, and a glass 18 is installed on the observation window 17. An observation window 17 is opened on the first main body 1 and a protective glass 18 is inlaid, so that the welding process can be observed and monitored in real time, making the welding process more intuitive, which is beneficial to monitoring and improving the welding process. The first main body 1 and the second main body 2 clamp a split tube 13. The first main body 1 and the second main body 2 are semi-circular structures, made of metal materials, with good stiffness and high temperature resistance. The arc dimensions match the product specifications. After the first main body 1 and the second main body 2 are combined and clamped, the whole device forms a rigid fixation for the workpiece to be welded, preventing the workpiece from loosening and deforming during the welding process, ensuring the assembly accuracy, and effectively guaranteeing the welding quality. The handle 3, the cushion block 7, the nut 15 and the screw rod 5 form an eccentric clamping device, adopting an eccentric wheel mechanism, with a wheel diameter of φ25mm, an eccentricity of 1.2 - 2.2mm, and an eccentric wheel characteristic of about 5.6 - 10.4, which can achieve self-locking.

[0024] Working principle and usage process of the utility model: For a positioning and gas protection device for internal hole welding of dense tube bundles in narrow spaces, first, the tube sheet or header pipe joint and the heat exchange tubes can be pre-assembled, such as the split tube 13. Then, the first main body 1 and the second main body 2 are respectively placed at the pre-assembled welding position from both sides of the split tube 13, and the first main body 1 and the second main body 2 can be hinged and engaged. The position of the device is finely adjusted, and the first main body 1 and the second main body 2 can be closed and pressed through the handle 3, spring 4, screw rod 5 and cushion block 7 to fix and clamp the tube sheet or header pipe joint and the heat exchange tubes. The cushion block 7 is tightly pressed by the elastic force of the spring 4 to achieve one-time adjustment and repeated use. After that, argon can be filled through the air inlet pipe 9, and then welding can be started. The welding situation can be observed through the glass 18 installed on the observation window 17. After welding, the protective gas can be closed through the valve 8, and the first main body 1 and the second main body 2 can be opened through the handle 3, spring 4, screw rod 5 and cushion block 7. The connecting hinge of the first main body 1 and the second main body 2 is separated, and the device is removed to complete the welding. It is suitable for all weldable metal materials. The outer diameter of the heat exchange tubes is φ16 - φ60, and the center distance between the tubes is 30 - 100 mm.

[0025] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A positioning and gas protection device for internal hole welding in a dense tube bundle in a narrow space, comprising a first main body (1) and a second main body (2), characterized in that: One side of the first main body (1) and the second main body (2) is hinged. The first main body (1) includes a vertical plate (6). A screw rod (5) is hinged to the left side of the vertical plate (6). A cushion block (7) is arranged on the outer ring of one side of the screw rod (5). A handle (3) is hinged to the left end of the screw rod (5). The first main body (1) further includes a support plate (19). Annular protective gas cavities are formed on the sides of the first main body (1) and the second main body (2) close to each other on the right side.

2. The positioning and gas protection device for internal hole welding of dense tube bundles in narrow spaces according to claim 1, wherein: An air inlet pipe (9) is installed on one side of the upper part of the first main body (1) and penetrates and extends into the annular protective gas cavity formed in the first main body (1). A valve (8) is installed on the air inlet pipe (9).

3. The positioning and gas protection device for internal hole welding of dense tube bundles in narrow spaces according to claim 1, characterized in that: The annular protective gas cavities formed on the sides of the first main body (1) and the second main body (2) close to each other on the right side will form an annular protective gas cavity after the first main body (1) and the second main body (2) are combined.

4. A positioning and gas protection device for internal hole welding of dense tube bundles in narrow spaces according to claim 1, characterized in that: A moving plate matching with the outer ring of one side of the screw rod (5) is arranged. Springs (4) surrounding the outer ring of the screw rod (5) are fixedly installed on the sides of the moving plate and the cushion block (7) close to each other.

5. A positioning and gas protection device for internal hole welding in a dense tube bundle in a narrow space according to claim 1, characterized in that: Grooves are formed on the support plate (19) and the left side of the second main body (2). One end of the screw rod (5) is hinged to the inner walls on both sides of the groove formed in the support plate (19). The groove formed on the left side of the second main body (2) is slightly larger than the outer ring of the screw rod (5).

6. The positioning and gas protection device for internal hole welding in a dense tube bundle in a narrow space according to claim 1, characterized in that: The right side of the handle (3) is U-shaped. A fixing plate is installed inside the U-shaped part on the right side of the handle (3) through a pin (10). One side of the screw rod (5) away from the vertical plate (6) penetrates through the fixing plate. A nut (15) is arranged on the outer ring of the end of the screw rod (5) penetrating through the fixing plate.

7. The positioning and gas protection device for internal hole welding of dense tube bundles in narrow spaces according to claim 1, characterized in that: An observation window (17) is formed on the right side of the support plate (19). Glass (18) is installed on the observation window (17). A half pipe (13) is clamped between the first main body (1) and the second main body (2).

8. A positioning and gas protection device for internal hole welding of dense tube bundles in narrow spaces according to claim 1, characterized in that: The handle (3), the cushion block (7), the nut (15) and the screw rod (5) form an eccentric clamping device, adopting an eccentric wheel mechanism with a wheel diameter of φ25mm, an eccentricity of 1.2 - 2.2mm, and an eccentric wheel characteristic of about 5.6 - 10.4, which can achieve self-locking.

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