A manual tungsten inert gas arc welding auxiliary device for the weld seam of the tube sheet and tube head of a heat exchanger

Abstract

The present invention discloses a manual tungsten inert gas arc welding auxiliary device for heat exchanger tube sheet and tube head welds. The device comprises an insertion tube, a fixed screw sleeve fixed therein, the fixed screw sleeve being provided with radial mounting holes, a radial tensioning rod being slidably mounted in each radial mounting hole, a radial through hole being provided in the insertion tube, an adjusting screw being concentrically mounted therein, the adjusting screw being threadedly connected to the fixed screw sleeve, a driving ring groove being provided in the adjusting screw, a compression spring being mounted in the radial mounting hole, the elastic force of the compression spring forcing the radial tensioning rod to slide inward, the other end of the adjusting screw being sheathed with a rotating sleeve rotatable about the adjusting screw, the rotating sleeve being provided with an insertion sleeve for facilitating the insertion of a manual tungsten inert gas arc welding torch. The auxiliary device can facilitate manual tungsten inert gas arc welding operations and improve welding quality.

Description

Technical Field

[0001] The invention relates to the technical field of welding assistance, in particular to a manual tungsten inert gas arc welding auxiliary device for a heat exchanger tube sheet and tube head weld. Background Art

[0002] The structure of a tubular heat exchanger includes a heat exchange tube and a tube sheet at both ends of the heat exchange tube. The tube sheet is provided with a number of sockets. The heat exchange tube needs to be welded when inserted into the socket. During welding, the end face of the socket is cut into a groove. The current welding method is manual tungsten inert gas arc welding. During welding, the argon arc welding torch needs to be manually operated to weld along the groove for a circle to form a weld. However, due to the need for manual operation, the welding operation skills of the workers are relatively high. Improper arc length and arc angle may cause defects such as incomplete welding of the weld metal groove root, noise on the inner wall of the heat exchange tube, and unfused groove surface. The heat exchange tube has a small diameter. When welding its girth weld, the position of the welding torch changes continuously, which often causes the girth weld to be non-round in appearance, unsightly in shape, and unstable welding quality. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a manual tungsten inert gas arc welding auxiliary device for the tube sheet and tube head welds of a heat exchanger. The auxiliary device can stabilize the arc length and set the running trajectory of the circumferential weld torch, facilitate the manual tungsten inert gas arc welding operation, and improve the quality of the product welds.

[0004] To solve the above technical problems, the technical solution of the present invention is: a manual tungsten inert gas arc welding auxiliary device for heat exchanger tube sheet and tube head welds, comprising an insertion tube, at least two fixing screw sleeves are fixed in the insertion tube, each fixing screw sleeve is provided with three radial mounting holes, a radial tensioning rod is radially slidably installed in each radial mounting hole, the insertion tube is provided with radial through holes corresponding to the radial tensioning rods one by one, an adjusting screw is concentrically installed in the insertion tube, the adjusting screw is threadedly connected to the fixing screw sleeve, the adjusting screw is provided with a driving ring groove corresponding to the inner end of the radial tensioning rod in contact with the driving ring groove, a driving inclined surface for driving the radial tensioning rod to slide outward, a compression spring is installed in the radial mounting hole, the elastic force of the compression spring forces the radial tensioning rod to slide inward, the other end of the adjusting screw is covered with a rotating sleeve that can rotate around the adjusting screw, and the rotating sleeve is provided with an insertion sleeve that is convenient for inserting a manual tungsten inert gas arc welding torch.

[0005] As a preferred solution, a locking screw is threadedly mounted on the adjusting screw, one end of the locking screw is in contact with the end of the fixed screw closest to the locking screw, and the rotating sleeve is arranged on the outside of the locking screw.

[0006] As a preferred solution, the rotating sleeve includes an inner sleeve body and an outer sleeve body, the inner sleeve body is slidably sleeved on the adjusting screw, the outer sleeve body is mounted on the external thread of the inner sleeve body, and the insert sleeve is arranged on the inner sleeve body.

[0007] As a preferred solution, the insert sleeve is connected to the inner sleeve body via a radial adjustment mechanism.

[0008] As a preferred solution, the radial adjustment mechanism includes a mounting column and a connecting column, the mounting column is arranged on the inner sleeve, the connecting column is connected to the insertion sleeve, a connecting nut is rotatably installed on the connecting column, a threaded section is provided on the mounting column, and the connecting nut is threadedly connected to the threaded section.

[0009] As a preferred solution, the connecting screw sleeve is connected to the insert sleeve via a universal ball structure.

[0010] As a preferred solution, both ends of the radial tensioning rod are spherical ends.

[0011] As a preferred solution, a latch is provided on the radial tensioning rod, and the compression spring is pre-compressed between the insertion tube and the latch.

[0012] As a preferred solution, the driving annular groove is an annular groove with a trapezoidal cross section.

[0013] After adopting the above technical scheme, the effect of the present invention is: since the manual tungsten inert gas arc welding auxiliary device for the tube sheet and tube head weld of the heat exchanger includes an insertion tube, at least two fixed screw sleeves are fixed in the insertion tube, each fixed screw sleeve is provided with three radial mounting holes, a radial tensioning rod is radially slidably installed in each radial mounting hole, the insertion tube is provided with radial through holes corresponding to the radial tensioning rods one by one, an adjusting screw is concentrically installed in the insertion tube, the adjusting screw is threadedly connected to the fixed screw sleeve, the adjusting screw is provided with a driving ring groove corresponding to the contact with the inner end of the radial tensioning rod, and the driving ring groove is provided with a driving inclined groove for driving the radial tensioning rod to slide outward. A compression spring is installed in the radial mounting hole, and the elastic force of the compression spring forces the radial tensioning rod to slide inward. The other end of the adjusting screw is covered with a rotating sleeve that can rotate around the adjusting screw. The rotating sleeve is provided with an insertion sleeve that is convenient for inserting a manual tungsten electrode argon arc welding torch. Therefore, during welding, the insertion tube can be inserted into the heat exchange tube, and then the adjusting screw is turned. The adjusting screw will move axially and make the driving inclined surface of the driving ring groove and the radial tensioning rod slide outward, thereby fixing the entire insertion tube to the inside of the heat exchange tube. Since the radial tensioning rod is uniformly driven by the adjusting screw, it can be ensured that the center of the adjusting screw, the center of the insertion tube and the center of the heat exchange tube are all concentric.

[0014] Furthermore, since a locking screw is threadedly mounted on the adjusting screw, one end of the locking screw contacts and mates with the end of the fixed screw closest to the locking screw, and the rotating sleeve is disposed on the outside of the locking screw, the locking screw can further tighten the adjusting screw, making it convenient to lock the adjusting screw after the radial tensioning rod tightens the inserted tube, preventing loosening and ensuring the stability of the center positioning accuracy of the heat exchange tube. Essentially, this ensures the stability of the radius accuracy of the girth weld trajectory. After the worker inserts the tungsten inert gas arc welding torch into the insertion sleeve, the rotating sleeve can be used to rotate it around the adjusting screw, causing the tungsten inert gas arc welding torch to operate according to the set girth weld trajectory, thus ensuring the roundness of the girth weld and improving the stability of the product weld quality.

[0015] Since the rotating sleeve includes an inner sleeve body and an outer sleeve body, the inner sleeve body is slidably sleeved on the adjusting screw, the outer sleeve body is installed with the outer thread of the inner sleeve body, and the insert sleeve is arranged on the inner sleeve body. The position of the inner sleeve body can be adjusted by utilizing the threaded connection relationship between the outer sleeve body and the inner sleeve body, and then the position of the insert sleeve can be adjusted, thereby facilitating the adjustment of the distance between the tungsten wire and the groove of the tungsten electrode argon arc welding torch, which is essentially to stabilize the arc length, that is, to stabilize the voltage value, and create conditions for the uniform heat input of the power supply.

[0016] Since the insert sleeve is connected to the inner sleeve body through a radial adjustment mechanism, the radial adjustment mechanism can better adjust the radial position of the insert sleeve, and further adjust the radial position between the tungsten electrode and the groove surface. In essence, it ensures the accuracy of the radius of the circumferential weld trajectory, ensures that the weld deposited metal is in the most suitable position between the tube sheet and the outer wall of the heat exchange tube, and ensures that the roundness of the circumferential weld is beautiful. Since the connecting screw sleeve is connected to the insert sleeve through a universal ball structure, the universal ball structure can better facilitate workers to adjust the angle of the tungsten electrode argon arc welding torch during the welding process, that is, adjust the angle between the tungsten electrode arc and the groove surface. Through the change of the arc angle, the power supply heat input is distributed on the tube sheet side and the outer wall side of the heat exchange tube, ensuring that the root of the groove is melted through and the depth of melting of the groove surface and the outer wall of the heat exchange tube meets the requirements of the standard, thereby ensuring the stability of the product weld quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and examples.

[0018] Figure 1 is a structural cross-sectional view of an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 Cross-sectional view at AA;

[0020] Figure 3 yes Figure 1 An enlarged schematic diagram at B;

[0021] Figure 4 It is a schematic diagram of the installation structure of the insertion sleeve and the rotating sleeve;

[0022] In the accompanying drawings: 1. tube sheet; 2. heat exchange tube; 3. insert tube; 4. fixing screw sleeve; 5. radial mounting hole; 6. compression spring; 7. radial tensioning rod; 8. adjusting screw; 9. drive ring groove; 10. drive bevel; 11. locking screw sleeve; 12. manual tungsten inert gas arc welding torch; 13. insert sleeve; 14. universal ball structure; 15. outer sleeve; 16. inner sleeve; 17. mounting column; 18. connecting screw sleeve; 19. connecting column; 20. cover; 21. latch; 22. radial through hole. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below through specific examples.

[0024] like Figures 1 to 4 As shown, a manual tungsten inert gas arc welding auxiliary device for the weld of the tube sheet and tube head of a heat exchanger includes an insertion tube 3, at least two fixed screw sleeves 4 are fixed in the insertion tube 3, and the preferred fixed screw sleeves 4 in this embodiment are two, each of which is provided with three radial mounting holes 5, and the number of radial mounting holes 5 on each fixed screw sleeve 4 is three and distributed circumferentially, a radial tensioning rod 7 is radially slidably installed in each radial mounting hole 5, a radial through hole 22 corresponding to the radial tensioning rod 7 is provided on the insertion tube 3, and an adjusting screw 8 is concentrically installed in the insertion tube 3, The adjusting screw 8 is threadedly connected to the fixed screw sleeve 4. The adjusting screw 8 is provided with a driving ring groove 9 corresponding to the inner end of the radial tensioning rod 7. The driving ring groove 9 is provided with a driving inclined surface 10 for driving the radial tensioning rod 7 to slide outward. A compression spring 6 is installed in the radial mounting hole 5. The elastic force of the compression spring 6 forces the radial tensioning rod 7 to slide inward. The other end of the adjusting screw 8 is provided with a rotating sleeve that can rotate around the adjusting screw 8. The rotating sleeve is provided with an insertion sleeve 13 for facilitating the insertion of a manual tungsten electrode argon arc welding torch 12.

[0025] In this embodiment, both ends of the radial tension rod 7 are spherical ends. The radial tension rod 7 is provided with a latch 21, and the compression spring 6 is pre-compressed between the insertion tube 3 and the latch 21. The compression spring 6 can be a cylindrical spring or a tower spring. The driving annular groove 9 is an annular groove with a trapezoidal cross-section. Therefore, one waist of the trapezoidal annular groove is the driving inclined surface 10. When the adjusting screw 8 moves axially, the driving inclined surface 10 will gradually contact the inner end of the radial tensioning rod 7, thereby pushing the radial tensioning rod 7 to slide outward, and the outer end of the radial tensioning rod 7 will be exposed from the radial through hole 22 on the insertion tube 3, thereby fixing the insertion tube 3 as a whole inside the heat exchange tube 2. Since the radial tensioning rod 7 is a synchronous action, the adjusting screw 8, the insertion tube 3 and the heat exchange tube 2 are all concentric, and the manual tungsten inert gas arc welding torch 12 is directly inserted into the insertion sleeve 13, and the rotating sleeve can rotate around the adjusting screw 8. In this way, the manual tungsten inert gas arc welding torch 12 can accurately weld the upper bevel of the tube plate 1, the welding quality is better controlled, and the weld after welding is more round.

[0026] And as Figure 1 and Figure 4 As shown, a locking screw sleeve 11 is also threadedly installed on the adjusting screw 8, and one end of the locking screw sleeve 11 is in contact with the end of the fixed screw sleeve 4 closest to the locking screw sleeve 11. The rotating sleeve is arranged on the outside of the locking screw sleeve 11. When the position of the adjusting screw 8 is adjusted into place, the locking screw sleeve 11 can be used to further lock the adjusting screw 8 to prevent its axial movement from causing the radial tensioning rod 7 to slide inward and loosen.

[0027] In this embodiment, the rotating sleeve includes an inner sleeve body 16 and an outer sleeve body 15. The inner sleeve body 16 is slidably sleeved on the adjusting screw 8. The outer sleeve body 15 is installed on the external thread of the inner sleeve body 16. The insert sleeve 13 is arranged on the inner sleeve body 16. In this way, the position between the inner sleeve body 16 and the outer sleeve body 15 can be changed by rotating the outer sleeve body 15, that is, the length of the rotating sleeve is changed. The change in the length of the rotating sleeve can change the spacing between the insert sleeve 13 and the locking screw sleeve 11, thereby changing the axial position of the manual tungsten electrode argon arc welding torch 12, thereby facilitating better welding.

[0028] The insert sleeve 13 is connected to the inner sleeve body 16 via a radial adjustment mechanism. This radial adjustment mechanism includes a mounting post 17 and a connecting post 19. The mounting post 17 is mounted on the inner sleeve body 16, and the connecting post 19 is connected to the insert sleeve 13. A connecting nut 18 is rotatably mounted on the connecting post 19. The mounting post 17 is provided with a threaded section, and the connecting nut 18 is threadedly connected to the threaded section. Rotating the connecting nut 18 changes the distance between the insert sleeve 13 and the mounting post 17, thereby adjusting the radial position of the insert sleeve 13. This ensures that the radial position of the tungsten needle of the manual tungsten inert gas arc welding torch 12 is aligned with the root of the groove.

[0029] In this embodiment, the connecting screw sleeve 18 is connected to the insert sleeve 13 via a universal ball structure 14. In this way, when the manual tungsten inert gas arc welding torch 12 is inserted into the insert sleeve 13, the welding torch can be swung by the universal ball structure 14, thereby facilitating the control of the welding angle.

[0030] The manual tungsten electrode argon arc welding torch 12 can be provided with a cover 20 for protecting the groove.

[0031] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Various modifications and alterations to the technical solutions of the present invention without departing from the spirit of the present invention shall fall within the scope of protection defined by the claims of the present invention.

Claims

1. A manual tungsten inert gas arc welding auxiliary device for the weld seam of a heat exchanger tube sheet and tube head, characterized by: The invention comprises an insertion tube, in which at least two fixed screw sleeves are fixed, each fixed screw sleeve is provided with three radial mounting holes, a radial tensioning rod is radially slidably installed in each radial mounting hole, the insertion tube is provided with radial through holes corresponding to the radial tensioning rods one by one, an adjusting screw is concentrically installed in the insertion tube, the adjusting screw is threadedly connected to the fixed screw sleeve, the adjusting screw is provided with a driving ring groove corresponding to the contact with the inner end of the radial tensioning rod, the driving ring groove is provided with a driving inclined surface that drives the radial tensioning rod to slide outward, a compression spring is installed in the radial mounting hole, the elastic force of the compression spring forces the radial tensioning rod to slide inward, the other end of the adjusting screw is provided with a rotating sleeve that can rotate around the adjusting screw, and the rotating sleeve is provided with an insertion sleeve for facilitating the insertion of a manual tungsten inert argon arc welding torch.

2. The manual tungsten inert gas arc welding auxiliary device for the tube sheet and tube head weld of a heat exchanger according to claim 1, characterized in that: A locking screw sleeve is also threadedly mounted on the adjusting screw, one end of the locking screw sleeve is in contact with the end of the fixed screw sleeve closest to the locking screw sleeve, and the rotating sleeve is arranged on the outside of the locking screw sleeve.

3. The manual tungsten inert gas arc welding auxiliary device for the tube sheet and tube head weld of a heat exchanger according to claim 2, characterized in that: The rotating sleeve includes an inner sleeve body and an outer sleeve body. The inner sleeve body is slidably sleeved on the adjusting screw. The outer sleeve body is installed on the external thread of the inner sleeve body. The insert sleeve is arranged on the inner sleeve body.

4. A heat exchanger tube sheet and tube head weld manual tungsten inert gas arc welding auxiliary device according to claim 3, characterized in that: The insert sleeve is connected to the inner sleeve body via a radial adjustment mechanism.

5. The manual tungsten inert gas arc welding auxiliary device for the tube sheet and tube head weld of a heat exchanger according to claim 4, characterized in that: The radial adjustment mechanism includes a mounting post and a connecting post. The mounting post is arranged on the inner sleeve body. The connecting post is connected to the insert sleeve. A connecting nut is rotatably installed on the connecting post. A threaded section is provided on the mounting post. The connecting nut is threadedly connected to the threaded section.

6. A heat exchanger tube sheet and tube head weld manual tungsten inert gas arc welding auxiliary device according to claim 5, characterized in that: The connecting screw sleeve is connected to the insert sleeve through a universal ball structure.

7. The manual tungsten inert gas arc welding auxiliary device for the tube sheet and tube head weld of a heat exchanger according to claim 6, characterized in that: Both ends of the radial tensioning rod are spherical ends.

8. The manual tungsten inert gas arc welding auxiliary device for the tube sheet and tube head weld of a heat exchanger according to claim 7, characterized in that: A latch is provided on the radial tensioning rod, and the compression spring is pre-compressed between the insertion tube and the latch.

9. The manual tungsten inert gas arc welding auxiliary device for the tube sheet and tube head weld of a heat exchanger according to claim 8, characterized in that: The driving annular groove is an annular groove with a trapezoidal cross section.

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