Steel column sheet body butt joint structure and brazing welding method thereof

Abstract

The invention discloses a steel column sheet body butt joint structure which comprises a steel column sheet body, the steel column sheet body comprises a sheet head and a plurality of sets of connecting pipes, the two ends of each connecting pipe are provided with connecting plugs through necking down, the connecting plugs are inserted into stepped grooves, brazing filler metal is arranged in the inner grooves in a sleeved mode, and the connecting plugs are connected with the sheet head in a sleeved mode. A first welding flux flow channel and a second welding flux flow channel are formed by the edges of the two sides of the inner groove in the connecting plug and the inner wall of the stepped groove; the connecting plugs are arranged at the two ends of the connecting pipe, the inner grooves are formed in the connecting plugs, and the connecting plugs are inserted into the stepped grooves of the sheet heads after the brazing materials are arranged in the inner grooves of the connecting plugs in a sleeving mode, so that welding seams can be hidden in the pipe body matching faces, exposed welding marks do not exist on the surfaces after brazing, polishing is not needed, and the appearance quality is remarkably improved; and the first welding flux runner and the second welding flux runner are formed by the edges of the two sides of the inner groove in the connecting plug and the inner wall of the stepped groove, so that double sealing is achieved, the compactness of a welding seam is enhanced, and the welding leakage rate is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal pipe fittings, and more specifically, particularly relates to a butt joint structure of steel column sheets and a brazing welding method therefor. Background Art

[0002] Steel column sheets play a crucial role in steel column drying racks. They are not only the core of the support structure but also the key components for heat transfer and distribution.

[0003] Currently, during the manufacturing process of steel column drying racks, the welding methods for the butt joint of steel column sheets usually adopt traditional welding methods such as manual arc welding and gas shielded welding. These methods have problems such as low welding efficiency, unstable weld quality, high air leakage rate, obvious surrounding welds, large welding deformation, etc. The weld marks in the later stage need to be polished or ground, resulting in high labor intensity and production costs. After polishing and grinding, there are obvious weld marks or dents on the surface, seriously affecting the appearance of the drying rack products. Therefore, we need to provide a butt joint structure of steel column sheets and a brazing welding method therefor. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art, such as low welding efficiency, unstable weld quality, high air leakage rate, obvious surrounding welds, large welding deformation, etc. The weld marks in the later stage need to be polished or ground, resulting in high labor intensity and production costs. After polishing and grinding, there are obvious weld marks or dents on the surface, seriously affecting the appearance of the drying rack products. A butt joint structure of steel column sheets and a brazing welding method therefor are proposed.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A butt joint structure of steel column sheets, including steel column sheets. The steel column sheets include a sheet head and multiple groups of connecting pipes. At both ends of the multiple groups of connecting pipes, socket joints are formed by necking down. Multiple stepped grooves for inserting the socket joints are opened inside the sheet head. The socket joints are inserted into the stepped grooves. Inner grooves are opened on the surface of the socket joints, and brazing filler metals are sleeved in the inner grooves. On both sides of the inner grooves on the socket joints, the edges form a first solder flow channel and a second solder flow channel with the inner wall of the stepped groove.

[0007] Preferably, the surface of the socket joint is in contact with the inner wall of the stepped groove.

[0008] A brazing rack for steel column sheets, including: a brazing rack. The brazing rack includes limit blocks, transverse fixing rods, and a base. There are two groups of limit blocks and two groups of bases. Multiple groups of transverse fixing rods are evenly fixedly connected to the top of the base. The two groups of limit blocks are symmetrically fixedly connected to the top of the transverse fixing rods.

[0009] Preferably, a plurality of longitudinal fixing rods for supporting the connecting pipes are fixedly connected to the top of the transverse fixing rod.

[0010] Preferably, the longitudinal fixing rods and the transverse fixing rod form a grid-like arrangement.

[0011] A steel column sheet assembly device includes: a bottom plate, a fixing seat fixedly installed on the top of the bottom plate, an adjusting mechanism arranged on the top of the bottom plate, an adjusting plate arranged on the adjusting mechanism, a pushing cylinder fixedly installed on the top of the adjusting plate, a pushing block fixedly installed at the telescopic end of the pushing cylinder, two groups of first head positioning seats for supporting the head fixedly installed symmetrically inside the fixing seat, two groups of second head positioning seats for supporting the head fixedly installed symmetrically inside the pushing block, and the head is arranged inside the first head positioning seat.

[0012] Preferably, positioning card plates are fixedly installed on the tops of the bottom plate and the adjusting plate, a plurality of card slots for supporting the connecting pipes are opened on the tops of the positioning card plates, and the connecting pipes are arranged inside the card slots.

[0013] Preferably, the adjusting mechanism includes guide rails and sliders. There are two groups of guide rails, and the two groups of guide rails are fixedly installed symmetrically on the top of the bottom plate. There are a plurality of sliders, and the plurality of sliders are fixedly installed in pairs on the bottom of the adjusting plate, and the sliders are slidably installed on the guide rails.

[0014] Preferably, fixing screws are arranged on the adjusting plate, and the threaded ends of the fixing screws are pressed against the tops of the guide rails.

[0015] A brazing welding method for a butt joint structure of a steel column sheet includes the following steps:

[0016] Step 1: Horizontally place the assembled steel column sheet on a brazing rack. The steel column sheet can be supported by multi-point contact through the limit blocks and the longitudinal fixing rods, and multiple groups of emissions can be realized on the limit blocks, the longitudinal fixing rods and the transverse fixing rods.

[0017] Step 2: Send the entire brazing rack into a brazing furnace, heat it above the melting point of the brazing filler metal under a nitrogen protection atmosphere, and keep it warm for 5 - 10 minutes.

[0018] Step 3: After brazing, cool it to below 80°C and take it out. The weld surface is smooth without oxidation, without collapse or false welding.

[0019] The technical effects and advantages of the present invention: A butt joint structure of a steel column sheet provided by the present invention has the following advantages compared with the prior art:

[0020] In the present invention, by providing socket joints at both ends of the connecting pipe and providing inner grooves on the socket joints, after sleeving the brazing filler metal on the inner grooves of the socket joints, the socket joints are inserted into the stepped grooves of the header, so that the weld seam can be hidden inside the mating surface of the pipe body. After brazing, there is no exposed weld mark on the surface, no grinding is required, and the appearance quality is significantly improved. Moreover, by using the sides on both sides of the inner groove on the socket joint and the inner wall of the stepped groove to form a first solder flow channel and a second solder flow channel, double sealing is achieved, the denseness of the weld seam is enhanced, and the welding air leakage rate is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural view of the steel column sheet body of the present invention;

[0022] Figure 2 is a schematic structural view when the steel column sheet body of the present invention is disassembled;

[0023] Figure 3 is one of the schematic partial structural views of the steel column sheet body of the present invention;

[0024] Figure 4 is the other of the schematic partial structural views of the steel column sheet body of the present invention;

[0025] Figure 5 is a schematic structural view of the steel column sheet body and the brazing fixture of the present invention;

[0026] Figure 6 is a schematic structural view of the brazing fixture of the present invention;

[0027] Figure 7 is one of the schematic structural views of the assembly device of the steel column sheet body of the present invention;

[0028] Figure 8 is the other of the schematic structural views of the assembly device of the steel column sheet body of the present invention.

[0029] In the figure: 100, steel column sheet body; 101, header; 102, brazing filler metal; 103, connecting pipe; 104, socket joint; 105, inner groove; 106, stepped groove; 107, first solder flow channel; 108, second solder flow channel; 200, brazing fixture; 201, limit block; 202, longitudinal fixing rod; 203, transverse fixing rod; 204, base; 3, fixed seat; 4, first header positioning seat; 5, positioning card board; 6, pushing block; 7, pushing oil cylinder; 8, clamping groove; 9, bottom plate; 10, guide rail; 11, slider; 12, adjusting plate; 13, second header positioning seat. DETAILED DESCRIPTION OF THE INVENTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] The present invention provides a butt joint structure of a steel column sheet as shown in Figures 1-4 Figure 5, which includes a steel column sheet 100. The steel column sheet 100 includes a sheet head 101 and multiple groups of connecting pipes 103. Plug connectors 104 are formed at both ends of the multiple groups of connecting pipes 103 through necking. Multiple stepped grooves 106 for plugging the plug connectors 104 are formed inside the sheet head 101. The plug connectors 104 are plugged into the stepped grooves 106. Inner grooves 105 are formed on the surfaces of the plug connectors 104. Brazing filler metals 102 are sleeved in the inner grooves 105. First solder flow channels 107 and second solder flow channels 108 are formed between the edges on both sides of the inner grooves 105 on the plug connectors 104 and the inner walls of the stepped grooves 106.

[0032] It should be noted that through the setting of the inner grooves 105 (groove depth 0.5 - 1.5 mm, width 1.2 - 2 mm), after the brazing filler metals 102 are melted in the inner grooves 105, they can completely fill the inner grooves 105, the first solder flow channels 107 and the second solder flow channels 108 to form a dense welding layer, ensuring the sealing performance of the welded joint. Moreover, the weld seam can be hidden inside the sheet head 101, and there is no exposed weld mark on the surface after brazing, eliminating the need for grinding and significantly improving the appearance quality.

[0033] The sheet head 101 adopts a multi-column steel structure (such as a three-column or four-column structure), and the brazing filler metal 102 is an annular brazing filler metal ring, and the material can be a copper-based brazing filler metal.

[0034] In an alternative embodiment: the surface of the plug connector 104 is in contact with the inner wall of the stepped groove 106.

[0035] It should be noted that after the plug connector 104 is plugged into the stepped groove 106, the surface of the plug connector 104 is in contact with the inner wall of the stepped groove 106, which is convenient for the brazing filler metal 102 to better weld the plug connector 104 to the inner wall of the stepped groove 106 after melting.

[0036] As shown in Figures 5-6A brazing frame for a steel column sheet body shown includes: a brazing frame 200, the brazing frame 200 includes a limit block 201, a transverse fixing rod 203 and a base 204. There are two groups of both the limit block 201 and the base 204, and there are multiple groups of the transverse fixing rods 203. The multiple groups of transverse fixing rods 203 are fixedly connected to the top of the base 204 evenly, and the two groups of limit blocks 201 are symmetrically and fixedly connected to the top of the transverse fixing rod 203.

[0037] It should be noted that through the cooperation of the limit block 201, the longitudinal fixing rod 202, the transverse fixing rod 203 and the base 204, it plays a role in supporting and placing the steel column sheet body 100.

[0038] In an alternative embodiment: Multiple groups of longitudinal fixing rods 202 for supporting the connecting pipe 103 are fixedly connected to the top of the transverse fixing rod 203.

[0039] In an alternative embodiment: The longitudinal fixing rods 202 and the transverse fixing rods 203 form a grid-like arrangement.

[0040] It should be noted that by forming a grid-like arrangement of the longitudinal fixing rods 202 and the transverse fixing rods 203, the structure is stable after welding between the longitudinal fixing rods 202 and the transverse fixing rods 203. In addition, with the two limit blocks 201 on both sides, it can ensure that the spacing of the steel column sheet bodies 100 is consistent after multiple sheets are placed, and each point is heated evenly, avoiding thermal deformation.

[0041] As Figures 7-8 A steel column sheet body assembly device shown includes: a bottom plate 9, a fixing seat 3 is fixedly installed on the top of the bottom plate 9, an adjusting mechanism is arranged on the top of the bottom plate 9, an adjusting plate 12 is arranged on the adjusting mechanism, a pushing cylinder 7 is fixedly installed on the top of the adjusting plate 12, a pushing block 6 is fixedly installed on the telescopic end of the pushing cylinder 7, two groups of first head positioning seats 4 for supporting the head 101 are symmetrically and fixedly installed inside the fixing seat 3, and two groups of second head positioning seats 13 for supporting the head 101 are symmetrically and fixedly installed inside the pushing block 6, and the head 101 is arranged in the first head positioning seat 4.

[0042] In an alternative embodiment: Positioning card plates 5 are fixedly installed on the tops of both the bottom plate 9 and the adjusting plate 12. Multiple groups of card slots 8 for supporting the connecting pipe 103 are opened on the tops of the positioning card plates 5, and the connecting pipe 103 is arranged in the card slots 8.

[0043] It should be noted that the header 101 is placed in the first header positioning seat 4 and the second header positioning seat 13, and the connecting tube 103 is placed in the slot 8 on the positioning card plate 5. The connecting tube 103 is supported by the positioning card plate 5, and the tightening cylinder 7 is started. The telescopic end of the tightening cylinder 7 pushes the pushing block 6, so that the pushing block 6 drives the header 101 in the second header positioning seat 13 to move, so that the header 101 can squeeze the connecting tube 103, and the plug connectors 104 at both ends of the connecting tube 103 are plugged into the stepped groove 106 of the header 101, so that the plug connector 104 and the inner wall of the stepped groove 106 are closely matched, so as to realize multi-tube synchronous welding, break through the efficiency bottleneck of traditional tube-by-tube welding, meet the needs of mass production, and improve production efficiency by more than 50%. After assembly, the edges on both sides of the inner groove 105 and the inner wall of the stepped groove 106 form the first solder flow channel 107 and the second solder flow channel 108.

[0044] In an optional embodiment: the adjustment mechanism includes a guide rail 10 and a slider 11, the guide rail 10 is provided with two groups, the two groups of guide rails 10 are symmetrically fixedly installed on the top of the base plate 9, the slider 11 is provided with multiple groups, the multiple groups of sliders 11 are fixedly installed in pairs at the bottom of the adjustment plate 12, and the slider 11 is slidably installed on the guide rail 10.

[0045] In an optional embodiment: a fixing screw is provided on the adjustment plate 12 , and a threaded end of the fixing screw is pressed against the top of the guide rail 10 .

[0046] It should be noted that, by cooperating with the guide rail 10 and the slider 11, the position of the adjustment plate 12 can be adjusted, so that the adjustment plate 12 can adjust the position between the first header positioning seat 4 and the second header positioning seat 13 when moving, so as to facilitate the assembly of steel column sheets 100 of different sizes, and the adjustment plate 12 can be adjusted and fixed by tightening it on the guide rail 10 with fixing screws.

[0047] A brazing welding method for a steel column sheet butt joint structure comprises the following steps:

[0048] Step 1: Place the assembled steel column sheet 100 horizontally on the brazing frame 200, and the steel column sheet 100 can be supported by multi-point contact through the limit block 201 and the longitudinal fixing rod 202, and multiple groups of discharge can be achieved on the limit block 201, the longitudinal fixing rod 202 and the transverse fixing rod 203;

[0049] Step 2: Place the brazing rack 200 as a whole into a brazing furnace, and heat it to a temperature above the melting point of the brazing material under a nitrogen protective atmosphere for 5-10 minutes;

[0050] Step 3: After brazing, cool down to below 80℃ and take it out. The weld surface should be smooth and free of oxidation, collapse or cold weld.

[0051] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described 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 invention shall be included within the protection scope of the present invention.

Claims

1. A steel column sheet butt joint structure, characterized in that: The invention comprises a steel column sheet (100), wherein the steel column sheet (100) comprises a sheet head (101) and a plurality of connecting tubes (103), both ends of the plurality of connecting tubes (103) are formed with plug connectors (104) through shrinking, the sheet head (101) is provided with a plurality of stepped grooves (106) for plugging the plug connectors (104), the plug connectors (104) are plugged into the stepped grooves (106), an inner groove (105) is provided on the surface of the plug connector (104), a brazing material (102) is sleeved in the inner groove (105), and the edges on both sides of the inner groove (105) on the plug connector (104) and the inner wall of the stepped groove (106) form a first solder flow channel (107) and a second solder flow channel (108).

2. The steel column sheet butt joint structure according to claim 1, characterized in that: The surface of the plug connector (104) contacts the inner wall of the stepped groove (106).

3. A steel column sheet brazing frame, used for placing the steel column sheet butt joint structure according to claim 1, characterized in that: include: A brazing frame (200), the brazing frame (200) comprising a limit block (201), a transverse fixing rod (203) and a base (204), the limit block (201) and the base (204) are each provided with two groups, the transverse fixing rod (203) is provided with multiple groups, the multiple groups of transverse fixing rods (203) are evenly fixedly connected to the top of the base (204), and the two groups of limit blocks (201) are symmetrically fixedly connected to the top of the transverse fixing rod (203).

4. A steel column sheet brazing frame according to claim 3, characterized in that: The top of the transverse fixing rod (203) is fixedly connected to a plurality of groups of longitudinal fixing rods (202) for supporting the connecting pipe (103).

5. The steel column sheet brazing frame according to claim 4, characterized in that: The longitudinal fixing rods (202) and the transverse fixing rods (203) form a grid arrangement.

6. A steel column sheet assembly device, used for assembling the steel column sheet butt joint structure according to claim 1, characterized in that: include: A bottom plate (9), a fixed seat (3) is fixedly installed on the top of the bottom plate (9), an adjustment mechanism is arranged on the top of the bottom plate (9), an adjustment plate (12) is arranged on the adjustment mechanism, a pushing cylinder (7) is fixedly installed on the top of the adjustment plate (12), a pushing block (6) is fixedly installed on the telescopic end of the pushing cylinder (7), two groups of first header positioning seats (4) for supporting a header (101) are symmetrically fixedly installed inside the fixed seat (3), two groups of second header positioning seats (13) for supporting a header (101) are symmetrically fixedly installed inside the pushing block (6), and the header (101) is arranged in the first header positioning seat (4).

7. The steel column sheet assembly device according to claim 6, characterized in that: A positioning card plate (5) is fixedly mounted on the top of the bottom plate (9) and the adjustment plate (12), and a plurality of card slots (8) for supporting the connecting tube (103) are provided on the top of the positioning card plate (5), and the connecting tube (103) is arranged in the card slot (8).

8. The steel column sheet assembly device according to claim 7, characterized in that: The adjustment mechanism comprises a guide rail (10) and a slider (11); the guide rail (10) is provided with two groups, and the two groups of the guide rails (10) are symmetrically fixedly installed on the top of the bottom plate (9); the slider (11) is provided with multiple groups, and the multiple groups of the sliders (11) are fixedly installed on the bottom of the adjustment plate (12) in pairs, and the sliders (11) are slidably installed on the guide rails (10).

9. The steel column sheet assembly device according to claim 8, characterized in that: The adjustment plate (12) is provided with a fixing screw, and the threaded end of the fixing screw is pressed against the top of the guide rail (10).

10. A brazing welding method for the steel column sheet butt joint structure according to claim 1, characterized in that: The steps include: Step 1: The assembled steel column sheet (100) is horizontally placed on the brazing frame (200), and the steel column sheet (100) can be supported by multi-point contact through the limit block (201) and the longitudinal fixing rod (202), and multiple groups of discharge can be realized on the limit block (201), the longitudinal fixing rod (202) and the transverse fixing rod (203); Step 2: The brazing frame (200) is put into a brazing furnace as a whole, and heated to a temperature above the melting point of the brazing material under a nitrogen protective atmosphere, and the temperature is kept at this temperature for 5-10 minutes; Step 3: After brazing, cool down to below 80℃ and take out. The weld surface should be smooth and free of oxidation, collapse or cold weld.

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