Subway stray current uniform backflow copper bar and rail hot melting tin soldering construction method
Through the hot melt welding construction method, the problems of overburning, cracks, broken rails and poor reflow caused by welding of the subway reflow copper tray and rails are solved, and a safer and more durable rail connection is achieved.
Patent Information
- Application Number
- CN202510015814.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-06
- Publication Date
- 2025-03-11
AI Technical Summary
During the welding process of the reflow copper tray between the subway, the rails are likely to cause overburn, cracks, broken rails and poor reflow, which affects the safe operation and maintenance of the subway parking lots.
The hot melt soldering construction method is adopted. By applying adhesive to the rails and the uniform reflux copper strips, and heating them with a liquefied air spray gun on the unbonded sides, the tin plate melts to make the two sticks closely adhere, and then the spikes and bolts are used for connection.
It effectively prevents the rails from overburning, cracks, broken rails and poor return, extends the service life of the rails, and ensures the safe operation and maintenance of subway parking lots.
Smart Images
Figure CN119589040A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of subway stray current construction, and specifically discloses a subway stray current equalizing return copper busbar and track hot-melt soldering construction method. Background Art
[0002] With the continuous development of the national economy, traffic congestion in large and medium-sized cities is becoming increasingly serious. Building subways has become the best choice for large and medium-sized cities to alleviate urban traffic congestion. The subway power supply project uses steel rails for return current. Due to the large current and the large number of return cables, the return copper busbar is mostly welded at the waist of the rail to meet the wiring needs. The return copper busbar and the rail are made of different materials. Welding will cause overburning, cracks, and broken rails, as well as burning accidents caused by poor return current, affecting the safe operation and maintenance of the subway parking lot.
[0003] At present, the welding of subway reflow copper busbars and rails mainly adopts exothermic welding, which has high process requirements. There are problems such as poor control of temperature during preheating, improper use of flux dosage, and lax control of tempering (cooling) link, which leads to changes in the internal metallographic structure of the rails and the formation of very brittle martensitic structure, causing certain damage to the rails and the risk of rail breakage, which will seriously shorten the service life of the rails in the parking lot. Summary of the invention
[0004] The invention provides a method for hot-melt soldering of a subway stray current return copper busbar and a rail, which can effectively prevent the overburning, cracking and breaking of the rails caused by welding the rails and the return copper busbar, as well as the burning of the rails caused by poor return flow.
[0005] The above-mentioned subway stray current return copper busbar and rail hot-melt soldering construction method comprises the following steps:
[0006] S1, grinding and rust removal of rails, and applying adhesive;
[0007] S2, applying adhesive on the uniform reflow copper busbar, attaching a tin plate and an anti-leakage round tin bar to the uniform reflow copper busbar, wherein the anti-leakage round tin bar comprises a lower stopper bar and side stoppers located on both sides of the lower stopper bar, the anti-leakage round tin bar is located below the tin plate, and two side stoppers of the anti-leakage round tin bar are against the lower edge of the tin plate;
[0008] S3, sticking the side of the reflux copper busbar with the tin plate and the anti-leakage round tin bar to the waist of the rail, and supporting the reflux copper busbar with a reflux copper busbar support frame;
[0009] S4, fixing the steel rails and the return copper busbar;
[0010] S5, use a liquefied gas spray gun to heat the side of the rail that is not bonded to the return copper busbar, the heating temperature is not more than 300℃, melt the tin plate to make the return copper busbar closely adhere to the rail, then drill holes in the return copper busbar and the rail, place expansion nails in the holes, and pass the bolts through the expansion nails to connect the rail and the return copper busbar.
[0011] Preferably, in step S1, a hand-held grinder is used to grind and remove rust from the rail 1.
[0012] Preferably, the thickness of the tin plate is 3 mm;
[0013] In steps S1 and S2, the thickness of the adhesive does not exceed 3 mm;
[0014] In steps S1, S2 and S3, the bonding of the tin plate, the anti-leakage round tin bar and the uniform reflow copper busbar, and the bonding of the uniform reflow copper busbar and the rail are completed within 1 hour.
[0015] Preferably, in step S3, the evenly distributed copper busbar support frame includes an upper support bar and a plurality of support hooks fixed below the upper support bar, the plurality of support hooks are clamped on the wing surface of the rail, and the evenly distributed copper busbar is placed on the upper support bar of the evenly distributed copper busbar support frame.
[0016] Preferably, in step S4, the steel rail and the uniform return copper bus are fixed by a fixed adjustment support frame; the fixed adjustment support frame includes an adjusting nut, a tightening disc, an adjusting screw, a sliding screw and a main support, the main support includes an upper crossbeam, a lower crossbeam and a vertical beam connecting the upper crossbeam and the lower crossbeam, the upper crossbeam is provided with a slide groove, the lower crossbeam is provided with a thread, the adjusting nut is threadedly installed on the lower crossbeam, the sliding screw is slidably connected with the slide groove of the upper crossbeam, the sliding screw is sleeved with an upper and lower set of locking nuts, the upper and lower sets of locking nuts are respectively located on the upper and lower sides of the upper crossbeam, the adjusting screw passes through the sliding screw, and a tightening disc is installed at the front end of the adjusting screw; the adjusting nut and the tightening disc are located on both sides of the steel rail and the uniform return copper bus, the adjusting nut presses the steel rail, and the tightening disc presses the uniform return copper bus.
[0017] Preferably, the fixed adjustment support frame also includes a screw handle fixed to the rear end of the adjustment screw; the number of the adjustment nuts is two.
[0018] Preferably, in step S5, a clamping rail drilling machine is used to drill holes in the return copper busbar and the rail; and an expansion nail machine is used to install the expansion nails in the holes and lock them.
[0019] Preferably, in step S5, the rails are monitored in real time during the heating process using an infrared laser temperature tester.
[0020] Compared with the prior art, the present invention has the following beneficial effects.
[0021] This method grinds and removes rust from the rails within the installation range of the equal return copper busbar, applies adhesive after the bright part is exposed, and then adheres the equal return copper busbar. Tin plates and anti-leakage round tin bars are respectively adhered to the equal return copper busbar. The anti-leakage round tin bars are located below and on both sides of the tin plates to prevent the tin plates from melting into tin liquid and dripping down. In order to enable the equal return copper busbar to be installed in a fixed position, an equal return copper busbar support frame is used so that the equal return copper busbar can be firmly fixed. A fixed adjustment support frame is used to tighten the rails and the equal return copper busbar respectively by adjusting the nuts and the tightening discs, so that the equal return copper busbar can be more reliably fixed on the rails, preventing the equal return copper busbar from loosening when drilling holes in the rails, and not disturbing the close connection between the equal return copper busbar and the rails. A liquefied gas spray gun is used to heat the side of the rail that is not bonded to the reflux copper busbar, and the heating temperature is not more than 300°C. During the heating process, an infrared laser temperature tester is used to monitor the rail in real time and strictly control the temperature to prevent the rail from overheating or insufficient temperature. This prevents the welding of the rail and the reflux copper busbar from causing overburning, cracks, and breakage of the rail, as well as burning of the rail caused by poor reflux, thus ensuring the safe operation and maintenance of the subway parking lot.
[0022] The reflux copper busbar has many terminals and generates a large reflux. In order to increase the conductivity of the rail and the reflux copper busbar, the rail and the reflux copper busbar are melt-welded. The welding medium is tin. The current carrying capacity of the fusion point is the same as that of the conductor, and it has good conductivity. After testing, the DC resistance ratio change before and after welding is close to zero, which is unmatched by any traditional connection method. Because it uses exothermic melting welding, there is no contact with high-temperature electric welding, no residual stress, and tin with good conductivity is used, which greatly enhances the corrosion resistance of the conductor.
[0023] The rails and the return copper bar are connected by expansion. The installation method uses a high-precision special clamping rail drilling machine to drill holes in the rails, remove burrs, and then use a special expansion hydraulic tool to install the cylindrical expansion nails in the rail holes and lock them, and finally connect them with bolts. The expansion method has the advantages of expansion nails being able to closely contact with the inner surface of the rail hole without leaving air gaps, anti-oxidation, large contact area, low contact resistance, and strong flow capacity. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0025] Figure 1 It is a structural schematic diagram of the reflux copper busbar;
[0026] Figure 2The diagram is a positional relationship diagram of the tin plate and the anti-leakage round tin bar;
[0027] Figure 3 It is a structural schematic diagram of the reflux copper busbar support frame;
[0028] Figure 4 It is a structural schematic diagram of a fixed and adjustable support frame;
[0029] Figure 5 It is a schematic diagram of hot-melt soldering of the reflow copper busbar and the rail.
[0030] In the figure: 1-rail; 2-uniform return copper bar; 3-tin plate; 4-anti-leakage round tin bar; 5-uniform return copper bar support frame; 6-adjusting nut; 7-tightening disc; 8-adjusting screw; 9-adjusting handle; 10-sliding screw; 11-main bracket; 12-expansion nail; 13-bolt. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with general skills in the field to which the present invention belongs.
[0032] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.
[0033] This embodiment provides a method for hot-melt soldering of subway stray current return copper busbars and rails, comprising the following steps.
[0034] S1, use a hand-held grinder to grind and remove rust from the rail 1, and apply adhesive, the thickness of the adhesive does not exceed 3 mm.
[0035] S2. Apply adhesive on the evenly reflowed copper bus 2. The thickness of the adhesive shall not exceed 3 mm. Stick the tin plate 3 and the anti-leakage round tin bar 4 on the evenly reflowed copper bus 2. The thickness of the tin plate 3 is 3 mm. The anti-leakage round tin bar 4 includes a lower baffle and side baffles on both sides of the lower baffle. The anti-leakage round tin bar 4 is located below the tin plate 3. The two side baffles of the anti-leakage round tin bar 4 are against the lower edge of the tin plate 3.
[0036] S3, the side of the return copper bar 2 with the tin plate 3 and the anti-leakage round tin bar 4 is adhered to the waist of the rail 1, and the return copper bar 2 is supported by the return copper bar support frame 5. The return copper bar support frame 5 includes an upper support bar and a plurality of support hooks fixed below the upper support bar, and the plurality of support hooks are clamped on the wing surface of the rail 1, and the return copper bar 2 is placed on the upper support bar of the return copper bar support frame 5.
[0037] In steps S1, S2 and S3, the bonding of the tin plate 3, the anti-leakage round tin bar 4 and the uniform reflow copper bus 2, and the bonding of the uniform reflow copper bus 2 and the rail 1 are completed within 1 hour.
[0038] S4, fix the rail 1 and the reflux copper bar 2 by fixing the adjustable support frame; the adjustable support frame includes an adjusting nut 6, a tightening disc 7, an adjusting screw 8, a screw handle 9, a sliding screw 10 and a main bracket 11, the main bracket 11 includes an upper crossbeam, a lower crossbeam and a vertical beam connecting the upper crossbeam and the lower crossbeam, a slide groove is provided on the upper crossbeam, a thread is provided on the lower crossbeam, the adjusting nut 6 is threadedly installed on the lower crossbeam, the sliding screw 10 is slidably connected to the slide groove of the upper crossbeam, and the sliding screw 10 The upper sleeve is provided with two sets of locking nuts, which are respectively located on the upper and lower sides of the upper crossbeam. The adjusting screw 8 passes through the sliding screw 10. The front end of the adjusting screw 8 is equipped with a tightening disc 7, and the rear end of the adjusting screw 8 is equipped with a screw handle 9. The adjusting nut 6 and the tightening disc 7 are located on both sides of the rail 1 and the return copper bar 2. The adjusting nut 6 presses the rail 1, and the sliding screw 10 is adjusted to a suitable position and then fixed. The screw handle 9 is rotated to make the tightening disc 7 reliably press the return copper bar 2. In this embodiment, the number of the adjusting nuts 6 is two. The adjusting nut 6 at the rear end presses the rail 1, and the adjusting nut 6 at the front end presses the adjusting nut 6 at the rear end to achieve locking.
[0039] S5. Use a liquefied gas spray gun to heat the side of the rail 1 that is not bonded to the return copper bus 2. The heating temperature is not more than 300°C. During the heating process, use an infrared laser temperature tester to monitor the rail 1 in real time, melt the tin plate 3 to make the return copper bus 2 closely adhere to the rail 1, and then use a clamping rail drilling machine to drill holes in the return copper bus 2 and the rail 1. Use an expansion nail machine to place the expansion nail 12 in the hole for hydraulic pressure, and pass the bolt 13 through the expansion nail 12 to connect the rail 1 and the return copper bus 2, and tighten them firmly.
[0040] In this embodiment, the rail 1 within the installation range of the uniform return copper bus 2 is polished and rust-removed, and an adhesive is applied after the bright part is exposed, and then the uniform return copper bus 2 is bonded, and the thickness of the adhesive does not exceed 3mm. The tin plate 3 and the anti-leakage round tin bar 4 are respectively bonded on the uniform return copper bus 2, and the anti-leakage round tin bar 4 can prevent the tin plate 3 from melting into tin liquid and dripping down. In order to enable the uniform return copper bus 2 to be installed in a fixed position, the uniform return copper bus support frame 5 is adopted so that the uniform return copper bus 2 can be fixed firmly. With a fixed adjustment support frame, the uniform return copper bus 2 is respectively pressed on the rail 1 and the uniform return copper bus 2 by adjusting the nut 6 and the tightening disc 7, so that the uniform return copper bus 2 is more reliably fixed on the rail 1, and the uniform return copper bus 2 is prevented from loosening when the rail 1 is drilled and the close connection between the uniform return copper bus 2 and the rail 1 is not disturbed. A liquefied gas spray gun is used to heat the side of the rail 1 that is not bonded to the reflux copper bus 2, and the heating temperature is not greater than 300°C. During the heating process, an infrared laser temperature tester is used to monitor the rail in real time and strictly control the temperature to prevent the rail 1 from overheating or insufficient temperature.
[0041] The rail 1 and the return copper busbar 2 are connected by expansion. The rail 1 is drilled and deburred by a high-precision special clamping rail drilling machine, and then a special expansion hydraulic tool is used to install the cylindrical expansion nail 12 in the rail hole and lock it, and finally the bolt 13 is used to connect.
[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for hot-melt soldering of subway stray current return copper bars and rails, characterized in that: The following steps are involved: S1, grinding and removing rust from the rail (1), and applying adhesive; S2, applying adhesive on the uniform reflow copper busbar (2), attaching the tin plate (3) and the anti-leakage round tin bar (4) to the uniform reflow copper busbar (2), wherein the anti-leakage round tin bar (4) comprises a lower stop bar and side stop bars located on both sides of the lower stop bar, the anti-leakage round tin bar (4) is located below the tin plate (3), and the two side stop bars of the anti-leakage round tin bar (4) are against the lower edge of the tin plate (3); S3, the side of the reflux copper busbar (2) with the tin plate (3) and the anti-leakage round tin bar (4) is adhered to the waist of the rail (1), and the reflux copper busbar (2) is supported by the reflux copper busbar support frame (5); S4, fixing the steel rail (1) and the return copper busbar (2); S5, using a liquefied gas spray gun to heat the side of the steel rail that is not bonded to the return copper busbar (2), the heating temperature is not greater than 300°C, the tin plate (3) is melted to make the return copper busbar (2) closely bonded to the steel rail (1), then drilling holes in the return copper busbar (2) and the steel rail (1), placing expansion nails (12) in the holes, and passing bolts (13) through the expansion nails (12) to achieve the connection between the steel rail (1) and the return copper busbar (2).
2. The method for hot-melt soldering of subway stray current return copper busbar and rail according to claim 1 is characterized in that: In step S1, a hand-held grinder is used to grind and remove rust from the rail (1).
3. The method for hot-melt soldering of subway stray current return copper busbar and rail according to claim 1 is characterized in that: The thickness of the tin plate (3) is 3 mm; In steps S1 and S2, the thickness of the adhesive does not exceed 3 mm; In steps S1, S2 and S3, the bonding of the tin plate (3), the anti-leakage round tin bar (4) and the uniform reflow copper busbar (2), and the bonding of the uniform reflow copper busbar (2) and the steel rail (1) are completed within 1 hour.
4. The method for hot-melt soldering of subway stray current return copper busbar and rail according to claim 1 is characterized in that: In step S3, the evenly-returned copper busbar support frame (5) comprises an upper support bar and a plurality of support hooks fixed below the upper support bar, the plurality of support hooks are clamped on the wing surface of the rail (1), and the evenly-returned copper busbar (2) is placed on the upper support bar of the evenly-returned copper busbar support frame (5).
5. The method for hot-melt soldering of subway stray current return copper busbar and rail according to claim 1 is characterized in that: In step S4, the steel rail (1) and the return copper busbar (2) are fixed by fixing and adjusting the support frame; The fixed adjustment support frame comprises an adjusting nut (6), a tightening disc (7), an adjusting screw (8), a sliding screw (10) and a main support (11); the main support (11) comprises an upper crossbeam, a lower crossbeam and a vertical beam connecting the upper crossbeam and the lower crossbeam; a sliding groove is arranged on the upper crossbeam, a thread is arranged on the lower crossbeam, the adjusting nut (6) is threadedly mounted on the lower crossbeam, the sliding screw (10) is slidably connected with the sliding groove of the upper crossbeam, an upper and lower group of locking nuts are sleeved on the sliding screw (10), and the upper and lower groups of locking nuts are respectively located on the upper and lower sides of the upper crossbeam; the adjusting screw (8) passes through the sliding screw (10), and a tightening disc (7) is installed at the front end of the adjusting screw (8); The adjusting nut (6) and the tightening disc (7) are located on both sides of the steel rail (1) and the return copper busbar (2); the adjusting nut (6) presses the steel rail (1) and the tightening disc (7) presses the return copper busbar (2).
6. The method for hot-melt soldering of subway stray current return copper busbar and rail according to claim 5 is characterized in that: The fixed adjustment support frame also includes a screw handle (9) fixed to the rear end of the adjustment screw (8); The number of the adjusting nuts (6) is two.
7. The method for hot-melt soldering of subway stray current return copper busbar and rail according to claim 1 is characterized in that: In step S5, a clamping rail drilling machine is used to drill holes in the return copper busbar (2) and the rail (1); The expansion nail (12) is installed in the eyelet and locked by using an expansion nail machine.
8. The method for hot-melt soldering of subway stray current return copper busbar and rail according to claim 1 is characterized in that: In step S5, during the heating process, the steel rail (1) is monitored in real time using an infrared laser temperature tester.