Induction annealing machine for tin-plated solder strip

Abstract

The utility model discloses a tin-plated solder strip induction annealing machine, relates to the technical field of photovoltaic solder strip production and processing, and solves the problem that the quality of a tin-plated solder strip is affected by short-circuit annealing. The transformer comprises a magnetic core, the magnetic core is provided with a vertically-through through hole, a coil penetrating through the through hole is wound on the magnetic core, and the coil can be electrified; the tin-plated solder strip can penetrate through the through hole in the magnetic core under guidance and is wound on the magnetic core to form at least one circle of closed-loop structure, and after the coil is powered on, short-circuit current can be generated in the tin-plated solder strip which forms the closed loop under the action of electromagnetic induction. According to the annealing machine, the electromagnetic induction principle is utilized, eddy current is generated in a copper wire of a tin-plated solder strip through an alternating magnetic field, so that materials are heated, the temperature is uniform, the problems of surface oxidation, discoloration and the like caused by local overheating are effectively avoided, and the surface quality of the copper wire is high.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic solder ribbon production and processing technology, and in particular to an induction annealing machine for tin-coated solder ribbon. Background Technology

[0002] Current photovoltaic ribbon annealing equipment utilizes the short-circuit annealing principle, also known as resistance annealing. Short-circuit annealing involves directly passing current through the copper wire, using the material's own resistance to generate heat and achieve the annealing effect. Different copper wire compositions result in different annealing effects.

[0003] Short-circuit annealing is a contact heating method that requires electrode clamping to energize the copper wire, relying on current density and energizing time to control the temperature. Its disadvantages are also quite obvious: 1. Due to the skin effect of current, the current requires high uniformity of the copper wire diameter. 2. The equipment cannot be grounded, posing a risk of electric shock. 3. Relying on the copper wheel for conductivity, poor contact during production can easily lead to localized overheating, abnormal yielding, or wire breakage. 4. The rotating copper wheel can cause the copper wire to jump and slip, leading to poor contact, and under the action of high current, pitting or burning marks can appear on the surface of the copper wire, resulting in larger copper wire grains. 5. Due to the friction of the electrode carbon brushes during the rotation of the copper wheel, environmental pollution will occur over time, requiring regular dust cleaning. 6. With the development of photovoltaic welding ribbons, short-circuit annealing is very unfriendly to heating ultra-fine copper wires and flat copper wires. Utility Model Content

[0004] The purpose of this invention is to solve the above-mentioned problems by designing an induction annealing machine for tin-coated solder strips, which solves the problem that short-circuit annealing affects the quality of tin-coated solder strips.

[0005] The technical solution of this utility model to achieve the above objectives is a soldering strip induction annealing machine, comprising at least one annealing station, wherein the annealing station has:

[0006] A magnetic core having a through hole running vertically through it, and a coil wound around the magnetic core passing through the through hole, the coil being capable of carrying electricity;

[0007] Under guidance, the solder ribbon can pass through the through-hole on the magnetic core and be wound on the magnetic core to form at least one closed loop structure. When the coil is energized, a short-circuit current can be generated in the closed loop of the solder ribbon under the action of electromagnetic induction.

[0008] Preferably, it also includes a frame, a water tank, a water removal assembly, and a mounting plate disposed on the frame, wherein the water removal assembly and the magnetic core are both mounted on the mounting plate, and the water tank is mounted on the frame.

[0009] Preferably, a third guide wheel is provided below the magnetic core, and a reversing wheel is provided above the magnetic core. The third guide wheel is located inside the water tank and is made of conductive material.

[0010] Preferably, the reversing wheel includes a first reversing wheel and a second reversing wheel, which are arranged side by side and at the same height.

[0011] Preferably, the mounting plate is also rotatably connected to a first traction wheel and a second traction wheel. A first tension wheel and a second tension wheel are respectively provided below the first traction wheel and the second traction wheel. The first tension wheel and the second tension wheel are located on both sides of the water removal assembly and are rotatably connected to two swing rods. The swing rods are rotatably connected to the mounting plate and can swing up and down to adjust the tension of the solder strip.

[0012] Preferably, a first guide wheel and a second guide wheel are also provided below the first traction wheel. The first guide wheel is rotatably connected to the mounting plate and is located on one side of the magnetic core, and the second guide wheel is located above the first tension wheel.

[0013] Preferably, the mounting plate is provided with a support base, the magnetic core is disposed on the support base, and the support base has a clearance hole that communicates with the through hole.

[0014] Preferably, the mounting plate is provided with a vertically fixed protective air pipe, which is fixed to the mounting plate by a fixed connection. The upper end of the protective air pipe passes through a through hole on the magnetic core, and the lower end extends into the water tank.

[0015] Preferably, the dewatering assembly includes a housing and two air knives located inside the housing. The two air knives are fixed inside the housing in a left-right offset manner. The top and bottom of the housing each have two openings corresponding to the two air knives.

[0016] Preferably, the frame is provided with two annealing stations.

[0017] Its advantages over existing technologies are:

[0018] This invention relates to an annealing machine that addresses the shortcomings of short-circuit annealing by inventing induction heating. Under guidance, tin-coated solder ribbon passes through a through-hole in a magnetic core and winds around the core to form at least one closed loop. When the coil wound around the core is energized, eddy currents are generated in the copper wire of the tin-coated solder ribbon using the principle of electromagnetic induction and an alternating magnetic field, thus creating a short-circuit current and heating the material. The advantages of this heating method are rapid heating, short annealing time, small copper wire grain size, uniform temperature, precise temperature control, and low energy consumption. Because it is non-contact heating, it avoids scratches, wear, and other defects on the copper wire surface caused by contact, and the heating is uniform, effectively preventing surface oxidation and discoloration caused by localized overheating, resulting in high-quality copper wire surface. Attached Figure Description

[0019] Figure 1This is a front structural diagram of the annealing machine in this utility model;

[0020] Figure 2 This is a schematic diagram of the axial structure of the annealing machine in this utility model;

[0021] Figure 3 This is a schematic diagram of the installation structure of the magnetic core and protective air tube;

[0022] Figure 4 This is a schematic diagram of the internal structure of the water removal component;

[0023] Figure 5 This is a schematic diagram of the structure when a coil is wound on a magnetic core;

[0024] Figure 6 This is a schematic diagram of the tin-coated solder ribbon winding process;

[0025] Figure 7 These are comparison images of tin-coated solder ribbons after induction annealing and short-circuit annealing, respectively.

[0026] In the diagram, 301 is the frame; 302 is the mounting plate; 303 is the water tank; 304 is the third guide wheel; 305 is the magnetic core; 306 is the first reversing wheel; 307 is the second reversing wheel; 308 is the dewatering assembly; 3081 is the housing; 30811 is the opening; 3082 is the air knife; 309 is the first traction wheel; 310 is the first guide wheel; 311 is the second guide wheel; 312 is the first tension wheel; 313 is the second tension wheel; 314 is the second traction wheel; 315 is the protective air pipe; 316 is the support base; 317 is the protective cover; and 318 is the coil. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0028] like Figures 1-2 As shown, a preferred embodiment of this utility model provides an induction annealing machine for tin-coated solder strips, which has two annealing stations. The structure at each annealing station is identical, allowing for simultaneous annealing of two sets of tin-coated solder strips.

[0029] Each annealing station has components such as a water tank 303, a third guide wheel 304, a magnetic core 305, a protective gas pipe 315, a dewatering assembly 308, a first traction wheel 309, a second traction wheel 314, a first reversing wheel 306, a second reversing wheel 307, a first tensioning wheel 312, a second tensioning wheel 313, a first guide wheel 310, and a second guide wheel 311. Among them, the third guide wheel 304, magnetic core 305, protective gas pipe 315, dewatering assembly 308, first traction wheel 309, second traction wheel 314, first reversing wheel 306, second reversing wheel 307, first tensioning wheel 312, second tensioning wheel 313, first guide wheel 310, and second guide wheel 311 are all mounted on the mounting plate 302 on the front of the frame 301 of the annealing machine.

[0030] like Figure 1 As shown, a water tank 303 is fixed to a frame 301 and contains water. The magnetic core 305 and the dewatering assembly 308 are both located above the water tank 303 and are arranged horizontally. A third guide wheel 304 is located inside the water tank 303 and is rotatably connected to a mounting plate 302. The third guide wheel 304 is made of a conductive material, preferably a copper wheel. A first traction wheel 309 is located to the upper left of the magnetic core 305, and a second traction wheel 314 is located to the upper right of the dewatering assembly 308, both rotatably connected to the mounting plate 302, for pulling the soldering strip.

[0031] The first guide wheel 310 is located to the lower left of the first traction wheel 309 and is rotatably connected to the mounting plate 302. The second guide wheel 311 is located below the first guide wheel 310, and the first tension wheel 312 is located below the second guide wheel 311. A rocker arm is located below the magnetic core 305, rotatably connected to the mounting plate 302, and can swing up and down. The first tension wheel 312 is rotatably connected to this rocker arm. The first tension wheel 312 is used to adjust the tension of the soldering ribbon entering the annealing machine.

[0032] A rocker arm is also provided above the water storage component, which is rotatably connected to the mounting plate 302. A second tensioning wheel 313 is rotatably connected to the rocker arm. The second tensioning wheel 313 is used to adjust the tension of the annealed solder strip.

[0033] The first reversing wheel 306 and the second reversing wheel 307 are arranged side by side at the same height and are rotatably connected to the mounting plate 302. The first reversing wheel 306 and the second reversing wheel 307 are located above the magnetic core 305 and at the junction of the magnetic core 305 and the water removal assembly 308.

[0034] refer to Figure 1 , Figure 3A support base 316 is fixedly mounted on the mounting plate 302 to support and fix the magnetic core 305. The magnetic core 305 has a through-hole, making it ring-shaped. In this embodiment, the magnetic core 305 is a nanocrystalline magnetic core 305, which has good magnetism.

[0035] refer to Figure 5 A coil 318 with n turns is wound around a magnetic core 305, where n is a positive integer and can be 1, 2, 3, ... The number of turns of the coil 318 can be adjusted as needed. The coil 318 is energized and passes through a through hole, winding around one side of the magnetic core 305. A protective cover 317 is provided on the outside of the magnetic core 305 to protect the magnetic core 305 and the coil 318 wound on it.

[0036] The protective gas tube 315 is fixed to the mounting plate 302 by a fastener. The upper end of the protective gas tube 315 passes through a through hole in the magnetic core 305, and the lower end extends into the water tank 304. Protective gas is introduced into the protective gas tube 315 to prevent the tin-coated solder ribbon from oxidizing during the annealing process.

[0037] like Figure 4 As shown, the water removal assembly 308 mainly consists of a housing 3081 and two annular air knives 3082, which are arranged horizontally and fixed inside the housing 3081. The housing 3081 has two openings 30811 at its top and bottom, corresponding to the two annular air knives 3082. Solder ribbon passes through the opening 30811 at the bottom of the housing 3081, enters the housing 3081, and then passes upwards through the annular air knives 3082. The annular air knives 3082 blow away water stains from the surface of the solder ribbon, which then exits through the opening 30811 at the top of the housing 3081.

[0038] like Figure 6 As shown, the solder ribbon exits from another workstation and enters the annealing machine. It first passes through the first guide roller 310, then upwards through the first traction roller 309, then downwards through the first tension roller 312 and the second guide roller 311, entering the water tank 303. After passing through the third guide roller 304, it passes upwards through the air knife 3082 on the left side of the dewatering assembly 308, then after being reversed by the first reversing roller 306 and the second reversing roller 307, it enters the protective air pipe 315 downwards, passes through the through hole on the magnetic core 305, re-enters the water tank 303, passes through the third guide roller 304 (the third guide roller 304 has two grooves to prevent the solder ribbon from tangling when passing through it twice), finally upwards through the air knife 3082 on the right side of the dewatering assembly 308, passes through the second traction roller 314, then downwards through the second tension roller 313, and upwards through the second traction roller 314 before exiting and entering the next workstation.

[0039] As the solder ribbon passes sequentially through the third guide roller 304, the first commutator roller 306, the second commutator roller 307, the magnetic core 305, and back to the third guide roller 304, it forms a closed loop, winding at least one turn around the magnetic core 305. This can be one, two, three, or more turns. The number of turns of the coil 318 wound around the magnetic core 305 is directly proportional to the number of turns of the solder ribbon wound between the magnetic core 305 and the third guide roller 304.

[0040] Utilizing the working principle of a transformer, after the coil 318 is energized, under the influence of the magnetic field of the magnetic core 305, and using the principle of electromagnetic induction, the tin-coated solder strip wound between the magnetic core 305 and the third guide wheel 304 will generate eddy currents in the copper wire through the alternating magnetic field, thereby heating this length of tin-coated solder strip and finally completing the annealing.

[0041] In photovoltaic copper wire production, induction annealing has become the mainstream choice due to its technological advantages and economies of scale. Short-circuit annealing, on the other hand, is limited by process limitations and is mostly used in specific scenarios or with older equipment.

[0042] from Figure 7 As can be seen, there is a significant difference in the surface quality of the tin-coated solder strip after induction annealing and short-circuit annealing, respectively. Induction annealing in the figure represents the solution of this embodiment, while short-circuit annealing represents the solution used in the existing equipment described in the background art. In this embodiment, induction annealing, being a non-contact heating method, avoids defects such as scratches and wear on the copper wire surface caused by contact. Furthermore, it ensures uniform heating, effectively preventing surface oxidation and discoloration caused by localized overheating, resulting in high-quality copper wire surface.

[0043] The above technical solution only embodies the preferred technical solution of this utility model. Any changes that may be made by those skilled in the art to certain parts of it embody the principle of this utility model and fall within the protection scope of this utility model.

Claims

1. A tin coated solder strip induction annealing machine comprising at least one annealing station, characterised in that, The annealing station has: A magnetic core (305) having a through hole passing through from top to bottom, and a coil (318) wound on the magnetic core (305) and passing through the through hole, the coil (318) being capable of being energized; The tinned solder strip can pass through the through hole on the magnetic core (305) and be wound on the magnetic core (305) to form at least one closed loop structure, and a short circuit current can be generated in the closed loop tinned solder strip under electromagnetic induction when the coil (318) is energized.

2. A tinned solder ribbon induction annealing machine according to claim 1, characterized in that Further comprising a rack (301), a water tank (303), a water removal assembly (308), and a mounting plate (302) arranged on the rack (301), the water removal assembly (308) and the magnetic core (305) being mounted on the mounting plate (302), and the water tank (303) being mounted on the rack (301).

3. A tinned solder ribbon induction annealing machine according to claim 2, wherein A third guide wheel (304) is arranged below the magnetic core (305), and a reversing wheel is arranged above the magnetic core (305), the third guide wheel (304) being located in the water tank (303) and being made of conductive material.

4. The tinned ribbon bond inducting annealing machine according to claim 3, characterized in that, The reversing wheel comprises a first reversing wheel (306) and a second reversing wheel (307), the first reversing wheel (306) and the second reversing wheel (307) being arranged side by side and at the same height.

5. The tinned ribbon bond inductor annealing machine of claim 2, wherein, The mounting plate (302) is further rotatably connected with a first traction wheel (309) and a second traction wheel (314), and a first tension wheel (312) and a second tension wheel (313) are arranged below the first traction wheel (309) and the second traction wheel (314) respectively, the first tension wheel (312) and the second tension wheel (313) being located on both sides of the water removal assembly (308) and being rotatably connected with two swing rods, the swing rods being rotatably connected with the mounting plate (302) and being capable of swinging up and down to adjust the tension of the tinned solder strip.

6. A tinned solder ribbon induction annealing machine according to claim 5, wherein A first guide wheel (310) and a second guide wheel (311) are further arranged below the first traction wheel (309), the first guide wheel (310) being rotatably connected with the mounting plate (302) and being located on one side of the magnetic core (305), and the second guide wheel (311) being located above the first tension wheel (312).

7. The tinned ribbon bond inductor annealing machine of claim 2, wherein, A support seat (316) is arranged on the mounting plate (302), the magnetic core (305) being arranged on the support seat (316), and the support seat (316) having an avoiding hole passing through the through hole.

8. The tinned ribbon bond inductor annealing machine of claim 2, wherein, A protection gas pipe (315) is arranged on the mounting plate (302) and is fixed vertically, the protection gas pipe (315) being fixed on the mounting plate (302) by fixed connection, the upper end of the protection gas pipe (315) passing through the through hole on the magnetic core (305), and the lower end extending into the water tank (303).

9. The tinned solder ribbon induction annealing machine of claim 2, wherein, The water removing assembly (308) comprises a box (3081) and two air knives (3082) arranged in the box (3081) and fixed in the box (3081) in a left-right staggered manner.

10. The tinned ribbon bond inductor annealing machine of claim 2, wherein, The rack (301) is provided with two annealing stations.

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