Connecting pipe flange assembling tool

Abstract

A connecting pipe and flange assembling tool comprises a positioning column, the upper end of the positioning column is used for being axially inserted into a connecting pipe, and the lower end of the positioning column is used for being axially inserted into a through hole in a flange, so that the connecting pipe is located above the flange, and the connecting pipe and the flange are coaxially arranged; an axial through channel is formed in the positioning column and used for inputting protective gas for welding, and air outlet holes are formed in the side wall of the channel at least corresponding to the position to be welded between the connecting pipe and the flange so as to communicate the channel with the outside. Compared with the prior art, the coaxiality of the connecting pipe and the flange can be guaranteed, and meanwhile the welding quality between the connecting pipe and the flange can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding, and in particular relates to a connecting flange assembly tool. Background Art

[0002] In the process of manufacturing pressure vessels, the welding of pipes and flanges is an indispensable weld. Due to the small diameter of small pipes and flanges, the weld shrinks during the assembly process, resulting in a deviation in the horizontality between the flange sealing surface and the pipe.

[0003] To this end, the Chinese utility model patent "Point-fixed welding device for pipe and flange assembly" with patent number 202022027998.8 and authorization announcement number CN213053553U discloses a point-fixed welding device for pipe and flange assembly, which has a base, a bolt column is vertically fixed at the center of the upper surface of the base, and a lower frustum stop seat and an upper frustum stop seat. They are composed of a large circular surface and a small circular surface parallel to each other with a conical circumferential surface connected to form an outer contour, and a central through hole passing through the large circular surface and the small circular surface. The lower frustum stop seat is inserted into the bolt column through the central through hole and the large circular surface downward, and the large circular surface of the lower frustum stop seat is supported on the base; the upper frustum stop seat is also inserted into the bolt column through the central through hole and the small table surface downward, and is located on the upper part of the lower frustum stop seat, and a nut is screwed into the bolt column and is located on the upper part of the large circular surface of the upper frustum stop seat.

[0004] Another example is the Chinese invention patent application "A method for ensuring the concentricity of the placed pipe after welding" with application number 202211683883.1 and application publication number CN116000427A, which includes: setting a circumferential groove at the middle position of the round steel, opening four grooves at equal distances at the end positions of the round steel, and evenly welding four stop pins at the four grooves to form a round steel with pins; inserting the round steel with pins into the pipe hole of the pipe flange and the shell and placing the pipe flange above the shell; and rotating the bolt hole of the pipe flange to the position required by the drawing, and then using tungsten inert gas arc welding to perform positioning spot welding. This method can ensure the concentricity of the placed pipe and shell assembly after welding at any inclination angle with the shell surface.

[0005] The above patents can ensure the coaxiality of the pipe and the flange during welding, but the welding quality needs to be further improved. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a pipe flange assembly tool for the current state of the prior art, so as to ensure the coaxiality of the pipe and the flange and improve the welding quality between the pipe and the flange.

[0007] The technical solution adopted by the utility model to solve the above technical problems is: a connecting flange assembly tool, including:

[0008] A positioning column, the upper end of which is used to be axially inserted into the pipe, and the lower end of which is used to be axially inserted into the through hole inside the flange, so that the pipe is located above the flange and the pipe and the flange are coaxially arranged;

[0009] Features:

[0010] An axially through channel is provided in the positioning column for inputting shielding gas for welding, and a gas outlet is provided on the side wall of the channel at least corresponding to the position to be welded between the connecting pipe and the flange to connect the channel with the outside.

[0011] In this way, the two ends of the positioning column are respectively inserted into the through holes of the connecting pipe and the flange to realize the rapid assembly of the connecting pipe and the flange, and the coaxiality of the connecting pipe and the flange can be guaranteed. At the same time, the channel inside the positioning column can be used to accommodate the shielding gas for welding, and the shielding gas is output from the air outlet on the side wall of the channel. Moreover, since the air outlet corresponds to the position to be welded between the connecting pipe and the flange, the welding quality is improved.

[0012] Preferably, there are at least two gas outlet holes, which are spaced apart along the circumference of the channel, so that the protective gas in the channel can be uniformly discharged through each gas outlet hole.

[0013] Preferably, the positioning column is formed by at least two columnar bodies arranged at intervals along the circumferential direction, the at least two columnar bodies jointly define the above-mentioned channel, and the above-mentioned air outlet hole is formed between two columnar bodies adjacent to each other along the circumferential direction.

[0014] Furthermore, a bottom plate is included, which is used to be arranged on the lower side of the flange, and a positioning protrusion is provided at the center of the upper plate surface of the bottom plate corresponding to the position of the through hole, and the positioning protrusion is inserted into the lower end of the channel. The positioning protrusion can constrain the position of the positioning column to prevent the relative displacement of the columnar bodies constituting the positioning column, thereby ensuring the formation of the through hole and the air outlet.

[0015] Furthermore, the positioning protrusion is in a tapered shape with a small upper end and a large lower end, and the shape of the lower end of the channel matches the shape of the positioning protrusion. The tapered structure is conducive to the insertion between the positioning protrusion and the lower end of the channel.

[0016] Preferably, the bottom plate and the flange are connected together in a detachable manner, so that the bottom plate can be replaced as needed to match the positioning column.

[0017] In the above schemes, preferably, a positioning pin is also included, which is radially inserted into the positioning column, and both ends of the positioning pin are exposed on both sides of the outside of the positioning column, and is used to support between the connecting pipe and the flange to form a gap to be welded between the connecting pipe and the flange.

[0018] In order to ensure the coaxiality of the pipe and the flange by the positioning column, preferably, the upper part of the outer peripheral surface of the positioning column is used to fit with the inner side surface of the pipe, and the lower part is used to fit with the inner wall surface of the through hole. In addition, the positioning column, the pipe and the flange can also be designed with reference to the existing technology.

[0019] Compared with the prior art, the utility model has the advantages that the two ends of the positioning column are respectively inserted into the through holes of the connecting pipe and the flange to realize the rapid assembly of the connecting pipe and the flange, and can ensure the coaxiality of the connecting pipe and the flange. At the same time, the channel inside the positioning column can be used to accommodate the shielding gas for welding, and the shielding gas is output from the air outlet on the side wall of the channel. Moreover, since the air outlet corresponds to the position to be welded between the connecting pipe and the flange, the welding quality is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a diagram of the use state of an embodiment of the utility model;

[0021] Figure 2 A longitudinal cross-sectional view of an embodiment of the utility model;

[0022] Figure 3 It is a transverse cross-sectional view of an embodiment of the utility model;

[0023] Figure 4 It is a three-dimensional exploded view of an embodiment of the utility model. DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] like Figures 1 to 4 As shown in FIG. 1 , a preferred embodiment of the pipe flange assembly tool of the utility model is shown. The pipe flange assembly tool comprises a positioning column 1 , a base plate 4 and a positioning pin 5 .

[0026] The upper end of the positioning column 1 is used to be axially inserted into the pipe 2, and the upper part of the outer peripheral surface of the positioning column 1 is used to fit with the inner side surface of the pipe 2; the lower end of the positioning column 1 is used to be axially inserted into the through hole 30 inside the flange 3, and the lower part of the outer peripheral surface of the positioning column 1 is used to fit with the inner wall surface of the through hole 30, so that the pipe 2 is located above the flange 3 and the pipe 2 and the flange 3 are coaxially arranged. At the same time, an axially through channel 11 is provided in the positioning column 1 for the input of shielding gas for welding, and an outlet hole 12 is provided on the side wall of the channel 11 at least corresponding to the position to be welded between the pipe 2 and the flange 3, so as to connect the channel 11 with the outside.

[0027] In this embodiment, the positioning column 1 is composed of four columnar bodies 10 arranged at intervals along the circumferential direction, and the four columnar bodies 10 jointly define the above-mentioned channel 11, and the above-mentioned air outlet holes 12 are formed between two adjacent columnar bodies 10 in the circumferential direction, and there are four air outlet holes 12.

[0028] The bottom plate 4 is used to be arranged on the lower side of the flange 3 and connected to the flange 3 in a detachable manner (such as threaded connection, screw connection, etc.). A positioning protrusion 41 is provided at the center of the upper plate surface of the bottom plate 4 corresponding to the position of the through hole 30. The positioning protrusion 41 is in a conical shape with a small upper end and a large lower end. The positioning protrusion 41 is inserted into the lower end of the channel 11, and the shape of the lower end of the channel 11 matches the shape of the positioning protrusion 41.

[0029] The positioning pin 5 is inserted into the positioning column 1 along the radial direction, and both ends of the positioning pin 5 are exposed on both sides of the outside of the positioning column 1, and is used to support between the pipe 2 and the flange 3, so that a gap 200 to be welded is formed between the pipe 2 and the flange 3.

[0030] Before welding, the positioning column 1, the pipe 2 and the flange 3 are plugged together, and then the positioning pin 5 is inserted into the positioning column 1 along the radial direction, which is convenient for operation.

[0031] During welding, the welding shielding gas (such as argon) is input into the channel 11 through the upper port of the channel 11, and then output from each gas outlet 12 to the gap 200 to be welded, thereby improving the welding quality.

[0032] In the specification and claims of the present invention, terms indicating directions, such as "upper", "lower", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A pipe flange assembly tool, comprising: A positioning column (1), the upper end of which is used to be axially inserted into the pipe (2), and the lower end of which is used to be axially inserted into the through hole (30) inside the flange (3), so that the pipe (2) is located above the flange (3) and the pipe (2) and the flange (3) are coaxially arranged; Features: The positioning column (1) is provided with an axially through channel (11) for inputting shielding gas for welding, and a gas outlet (12) is provided on the side wall of the channel (11) at least corresponding to the position to be welded between the connecting pipe (2) and the flange (3) to connect the channel (11) with the outside.

2. The pipe flange assembly tool according to claim 1, characterized in that: There are at least two air outlet holes (12), which are arranged at intervals along the circumference of the channel (11).

3. The pipe flange assembly tool according to claim 2, characterized in that: The positioning column (1) is formed by at least two columnar bodies (10) arranged at intervals in the circumferential direction, the at least two columnar bodies (10) jointly define the above-mentioned channel (11), and the above-mentioned air outlet hole (12) is formed between two circumferentially adjacent columnar bodies (10).

4. The pipe flange assembly tool according to claim 3 is characterized in that: It also includes a bottom plate (4) for being arranged on the lower side of the flange (3), and a positioning protrusion (41) is provided at the center of the upper plate surface of the bottom plate (4) corresponding to the position of the through hole (30), and the positioning protrusion (41) is inserted into the lower port of the channel (11).

5. The pipe flange assembly tool according to claim 4, characterized in that: The positioning protrusion (41) is in a conical shape with a small upper end and a large lower end, and the shape of the lower port of the channel (11) matches the shape of the positioning protrusion (41).

6. The pipe flange assembly tool according to claim 4, characterized in that: The base plate (4) and the flange (3) are connected together in a detachable manner.

7. The pipe flange assembly tool according to any one of claims 1 to 6, characterized in that: It also includes a positioning pin (5) which is radially inserted into the positioning column (1), and the two ends of the positioning pin (5) are exposed on both sides of the outside of the positioning column (1), and is used to support between the connecting pipe (2) and the flange (3) so that a gap (200) to be welded is formed between the connecting pipe (2) and the flange (3).

8. The pipe flange assembly tool according to any one of claims 1 to 6, characterized in that: The upper portion of the outer peripheral surface of the positioning column (1) is used to fit with the inner side surface of the connecting pipe (2), and the lower portion is used to fit with the inner wall surface of the through hole (30).

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