Universal small tube inner wall welding tool

Abstract

The utility model discloses a general type small pipe inner wall welding frock, including the hollow sleeve, the argon arc welding gun shell body of back end is placed in the hollow sleeve, the side seam both sides of hollow sleeve are fixedly connected with two parallel plates, a bolt passes through two parallel plates and is equipped with the fastening nut, the front end of argon arc welding gun shell body is equipped with the electrode, the short section hollow sleeve is equipped outside the argon arc welding gun shell body between the electrode and hollow sleeve, the side seam both sides of short section hollow sleeve are fixedly connected with two connecting plates, the lower end of one lower pivot is fixedly connected with the mounting panel, one connecting bolt passes through two connecting panels and mounting panel, and the locking nut is equipped on connecting bolt, the upper end of lower pivot is connected with the parallel longitudinal two pressure plates, and more than one pressure bolt passes through two pressure plates, and the pressure nut is equipped on pressure bolt, the lower end of one upper pivot is clamped by two pressure plates, and the upper end of upper pivot is fixedly connected with the reflector, the utility model discloses can adjust the elongation of welding torch in the pipe axial direction, and observes the welding working condition in the pipe, to improve the welding quality accurately.

Description

Technical Field

[0001] This utility model relates to a welding fixture for the inner wall of a small tube. Background Technology

[0002] In boilers and nuclear power equipment, there are numerous situations where welding is required on the inner walls of small tubes. For example, during the manufacturing process of the upper end cap of a nuclear power plant pressurizer, according to the process requirements for assembling the spray nozzle assembly, the spray nozzle must first be welded to the safety end of the nozzle before the thermal shock protection sleeve is inserted into the spray nozzle for welding to complete the assembly. However, during the welding of the thermal shock protection sleeve, the small inner diameter of the sleeve makes it impossible to observe the specific welding position. In addition, factors such as the limited welding angle of the argon arc welding torch and insufficient torch extension to reach the welding position inside the tube lead to problems such as poor welding quality of the thermal shock protection sleeve.

[0003] The current solution is to use the welders' rich experience and skilled welding techniques to perform "blind welding," but this method is subject to chance and cannot accurately control the welding quality. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings of the existing technology by providing a universal welding fixture for the inner wall of small pipes. This fixture can adjust the axial extension of the welding torch inside the pipe and allow for observation of the welding conditions inside the pipe, thereby precisely improving the welding quality.

[0005] To achieve the above objectives, this utility model provides a general-purpose welding fixture for the inner wall of small pipes, comprising a perforated sleeve and an argon arc welding gun housing with its rear end placed within the perforated sleeve. The fixture is characterized by: two parallel plates fixedly connected to the side seams of the perforated sleeve; a bolt passing through the two parallel plates and fitted with a fastening nut; an electrode at the front end of the argon arc welding gun housing; a short-section perforated sleeve outside the argon arc welding gun housing between the electrode and the perforated sleeve; two connecting plates fixedly connected to the side seams of the short-section perforated sleeve; a mounting plate fixedly connected to the lower end of a lower rotating shaft; a connecting bolt passing through the two connecting plates and the mounting plate; a locking nut for fixing the mounting plate and the short-section perforated sleeve on the connecting bolt; the upper end of the lower rotating shaft connected to two parallel longitudinal pressure plates; one or more clamping bolts passing through the two pressure plates; each clamping bolt fitted with a clamping nut; the lower end of an upper rotating shaft clamped by the two pressure plates; and a reflector fixedly connected to the upper end of the upper rotating shaft.

[0006] The connection structure between the upper end of the lower rotating shaft and the two parallel longitudinal pressure plates can be as follows: a sleeve is fixedly connected to the upper end of the lower rotating shaft, and a mandrel placed in the sleeve is fixedly connected to one pressure plate. The connection between the upper end of the lower rotating shaft and the two pressure plates is achieved through the cooperation of the sleeve and the mandrel.

[0007] The connection structure between the upper end of the lower rotating shaft and the two parallel longitudinal pressure plates can also be as follows: a steel ball is fixedly connected to the upper end of the lower rotating shaft, and spherical grooves are provided on the adjacent sides of the two pressure plates. The steel ball is placed in the two spherical grooves, and the clamping bolt is located longitudinally between the upper end of the lower rotating shaft and the lower end of the upper rotating shaft; the connection between the upper end of the lower rotating shaft and the two pressure plates is achieved by the cooperation of the steel ball and the two spherical grooves.

[0008] The argon arc welding torch housing of this invention is connected to the hollow sleeve by a plug-in method, and the axial position of the argon arc welding torch housing can be adjusted, thereby adjusting the axial elongation of the welding torch inside the tube. It is fixed by bolts and fastening nuts to ensure the stability of the welding torch length. A reflector is provided on the argon arc welding torch housing through a short hollow sleeve, a lower rotating shaft, two pressure plates, and an upper rotating shaft. The welding condition inside the tube can be observed through the reflector, thereby accurately improving the welding quality.

[0009] As a further improvement of this utility model, a steel ball is fixedly connected to the lower end of the upper rotating shaft, and a corresponding spherical groove is provided on the adjacent side of the two pressure plates. The steel ball is placed in the two spherical grooves. The upper rotating shaft can be rotated within a large range to realize the rotation of the reflector at multiple angles and improve the visibility range of the reflector.

[0010] As a further improvement of this utility model, the reflector is located above the electrode; this facilitates observation of the entire welding position and further improves the visibility range of the reflector.

[0011] This invention can adjust the axial elongation of the welding torch inside the pipe and observe the welding conditions inside the pipe, thereby precisely improving the welding quality. Attached Figure Description

[0012] Figure 1 This is a front view of an embodiment of the present utility model.

[0013] Figure 2 for Figure 1 Enlarged side view of the hollowed-out sleeve.

[0014] Figure 3 for Figure 1 Enlarged side view of the housing of a TIG welding torch.

[0015] Figure 4 for Figure 1 Enlarged 3D view of the short and medium-length hollowed-out sleeve, lower rotating shaft, two pressure plates, upper rotating shaft, and reflector.

[0016] Figure 5 This is a partial view of another embodiment of the present invention. Detailed Implementation

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

[0018] like Figures 1 to 4As shown, a general-purpose welding fixture for the inner wall of a small tube in this embodiment includes a perforated sleeve 1, an argon arc welding gun housing 2 with its rear end placed inside the perforated sleeve 1, and a short-section perforated sleeve 3. Both the perforated sleeve 1 and the short-section perforated sleeve 3 have side seams. Two parallel plates 4 are welded and fixed to both sides of the side seam of the perforated sleeve 1. A bolt 5 passes through the two parallel plates 4 and is provided with a fastening nut (not shown). An electrode 6 is provided at the front end of the argon arc welding gun housing 2. The short-section perforated sleeve 3 is located outside the argon arc welding gun housing 2 between the electrode 6 and the perforated sleeve 1. Two connecting plates 7 are welded and fixed to both sides of the side seam of the short-section perforated sleeve 3. A mounting plate 9 is welded and fixed to the lower end of a lower rotating shaft 8. A connecting bolt 10 passes through the two connecting plates 7 and the mounting plate 9. A fixing mounting is provided on the connecting bolt 10. The locking nuts (not shown) of plate 9 and short-section hollow sleeve 3; the parallel longitudinal pressure plates 11 and 12 are provided with two sets of spherical grooves, the upper end of the lower rotating shaft 8 is fixedly connected to a steel ball 13, which is placed in one set of spherical grooves of the two pressure plates 11 and 12, the lower end of an upper rotating shaft 14 is fixedly connected to a steel ball 15, which is placed in another set of spherical grooves of the two pressure plates 11 and 12, and both steel balls 13 and 15 are clamped by the two pressure plates 11 and 12. The upper end of the upper rotating shaft 14 is fixedly connected to a reflector 16, which is located above the electrode 6; a clamping bolt 17 passes through the two pressure plates 11 and 12, and each clamping bolt is provided with a clamping nut (not shown). The clamping bolt 17 is located longitudinally between the upper end of the lower rotating shaft 8 and the lower end of the upper rotating shaft 14;

[0019] The inner diameter of the hollow sleeve 2 is slightly larger than that of the welding torch handle. When this utility model is used, the hollow sleeve 2 is inserted outside the welding torch handle, the cable passes through the hollow sleeve 1 and the argon arc welding torch housing 2 and is connected to the electrode 6, and the protective gas tube, etc., passes through the hollow sleeve 2 and is placed inside the argon arc welding torch housing 2.

[0020] The argon arc welding torch housing 2 is connected to the perforated sleeve 1 via a plug-in connection, allowing adjustment of the axial position of the argon arc welding torch housing 2, thereby adjusting the axial elongation of the welding torch within the tube. It is secured by bolts 5 and fastening nuts to ensure the stability of the welding torch length. A reflector 16 is mounted on the argon arc welding torch housing 2 via a short perforated sleeve 3, a lower rotating shaft 8, two pressure plates 11 and 12, and an upper rotating shaft 14. The short perforated sleeve 3 is fitted onto the outer argon arc welding torch housing 2 and secured by connecting bolts 10 and locking nuts. The short perforated sleeve 3 allows the reflector 16 to move axially along the welding torch. The upper rotating shaft 14 can rotate within a wide range through the groove of the steel ball 15, allowing the reflector to rotate at multiple angles. Furthermore, the reflector 16, located above the electrode 6, increases the reflector's visibility and facilitates observation of the entire welding position. The welding condition inside the pipe can be observed through the reflector 16, thus precisely improving welding quality. Both the upper rotating shaft 14 and the lower rotating shaft 8 are fitted with spherical grooves on the two pressure plates 11 and 12 via their steel balls, allowing for simultaneous installation and improved efficiency. The two pressure plates 11 and 12 can also rotate around the steel ball 13 within a certain range, adjusting their orientation.

[0021] This utility model is not limited to the above-described embodiments, such as... Figure 5 As shown, the connection structure between the upper end of the lower rotating shaft 8 and the two parallel longitudinal pressure plates 11 and 12 can also be as follows: a sleeve 18 is fixedly connected to the upper end of the lower rotating shaft 8, and a mandrel 19 placed in the sleeve 18 is fixedly connected to the pressure plate 11. By the sleeve 18 and the mandrel 19 cooperating and being clamped by the two pressure plates 11 and 12, the connection between the upper end of the lower rotating shaft 8 and the two pressure plates 11 and 12 can be realized, and the two pressure plates 11 and 12 can rotate around the mandrel and adjust their position.

[0022] The above embodiments have been used to illustrate the invention, but it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit the invention to the scope of the described embodiments.

Claims

1. A general-purpose welding fixture for the inner wall of small pipes, comprising a perforated sleeve and an argon arc welding torch housing with its rear end placed within the perforated sleeve, characterized in that: Two parallel plates are fixed to both sides of the side seam of the hollow sleeve. A bolt passes through the two parallel plates and is equipped with a fastening nut. An electrode is provided at the front end of the argon arc welding gun housing. A short section of hollow sleeve is provided outside the argon arc welding gun housing between the electrode and the hollow sleeve. Two connecting plates are fixed to both sides of the side seam of the short section of hollow sleeve. A mounting plate is fixed to the lower end of the lower rotating shaft. A connecting bolt passes through the two connecting plates and the mounting plate. The connecting bolt is equipped with a locking nut for fixing the mounting plate and the short section of hollow sleeve. The upper end of the lower rotating shaft is connected to two parallel longitudinal pressure plates. One or more clamping bolts pass through the two pressure plates. Each clamping bolt is equipped with a clamping nut. The lower end of the upper rotating shaft is clamped by the two pressure plates. A reflector is fixed to the upper end of the upper rotating shaft.

2. The universal small pipe inner wall welding fixture as described in claim 1, characterized in that: A sleeve is fixedly connected to the upper end of the lower rotating shaft, and a mandrel placed in the sleeve is fixedly connected to a pressure plate. The upper end of the lower rotating shaft is connected to the two parallel pressure plates through the cooperation of the sleeve and the mandrel.

3. The universal small pipe inner wall welding fixture as described in claim 1, characterized in that: A steel ball is fixed to the upper end of the lower rotating shaft. Spherical grooves are provided on the adjacent sides of the two pressure plates. The steel ball is placed in the two spherical grooves. The clamping bolt is located longitudinally between the upper end of the lower rotating shaft and the lower end of the upper rotating shaft.

4. A general-purpose welding fixture for the inner wall of small pipes as described in any one of claims 1 to 3, characterized in that: A steel ball is fixed to the lower end of the upper rotating shaft, and a corresponding spherical groove is provided on the adjacent side of the two pressure plates, with the steel ball placed in the two spherical grooves.

5. The universal small pipe inner wall welding fixture as described in claim 4, characterized in that: The reflector is located above the electrode.

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