Processing device for composite solder contact strip

Abstract

The utility model particularly relates to a processing device for a re-welding contact strip, which comprises a feeding device, a receiving device and a control system, a conveying pipeline is arranged between the feeding device and the receiving device, the feeding device conveys the strip to an inlet of the conveying pipeline, and the receiving device conveys the strip to the inlet of the conveying pipeline. The discharging device comprises a first discharging device for conveying a contact strip and a second discharging device for conveying a compound solder contact strip, the conveying speed of the first discharging device is the same as that of the second discharging device, and the interior of the conveying pipeline is sealed and is provided with a protective atmosphere; the conveying pipeline is sequentially provided with a composite solder heating device for heating the protective atmosphere and a cooling device for cooling the protective atmosphere in the direction from the inlet to the outlet. According to the processing device, the product consistency is good, air holes are not prone to being generated in the product, the strength and toughness of the finished product are high, the requirement for automatic production of the contact assembly is met, the production efficiency is high, manufacturing is easy, and the length can reach 100-300 m.

Description

Technical Field

[0001] The utility model relates to the technical field of electric contact materials, in particular to a processing device for composite solder contact strips. Background Art

[0002] Electrical contact materials are essential contact components in current-carrying conversion devices. They are responsible for connecting and disconnecting the electric control circuit and the load circuit current. They are used in various light and heavy load high and low voltage electrical appliances, household appliances, automotive appliances and aerospace appliances. Their materials determine the breaking capacity of the switch and the reliability of the electrical contact. As the most widely studied and applied electrical contact material, silver-based electrical contact materials have good wear resistance, welding resistance, conductivity and low contact resistance. At present, an important type of contact material in low-voltage switchgear is silver-based alloy contact material, especially relays, circuit breakers and contactors, which are large-scale and widely used electrical appliances. Almost all of them use silver-based electrical contact materials, among which silver tungsten and silver graphite are typical materials used in circuit breakers. At present, the mainstream products in the contact material market have a high silver content, and the annual silver consumption is very huge. Silver is a scarce precious metal and silver resources are very limited. With the increase in usage, the price of silver will inevitably soar, which will make the cost of producing electrical contact materials high, the economic benefits of enterprises will decline, and the social benefits will also be greatly reduced. Saving silver in the production process has important economic significance and scientific value for silver-based electrical contact materials.

[0003] The application field of relays has shifted from traditional application fields to emerging fields. Relay products have transformed from low-end products to high-end products, and the relay industry value chain has continued to extend to the high end. In terms of product performance, it has developed in the direction of lightweight, miniaturization, high integration and automated production. Among them, the strip contact material is convenient for the subsequent automated production of contact components. It has greatly improved the production efficiency of the enterprise, improved the economic benefits of the enterprise, and is more conducive to the development of the enterprise.

[0004] Patent CN115810494A discloses a silver-graphite-copper electrical contact material made of silver powder, graphite powder, additives and copper powder as raw materials through chemical powder making and solid phase sintering process. After the powder is compressed by the powder metallurgy method, the internal pores of the product cannot be completely eliminated, so the strength and toughness of the product are relatively poor, and the silver layer is unevenly distributed, the material cost is relatively high, and it is not convenient for the automated production of contact components compared to strip materials. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a processing device for a composite solder contact strip.

[0006] The technical solution adopted by the utility model is as follows: a processing device for re-welding contact strips, including a discharge device, a receiving device and a control system, wherein a conveying pipeline is arranged between the discharge device and the receiving device.

[0007] The conveying pipeline has an inlet and an outlet. The unloading device is located at one side of the inlet of the conveying pipeline and conveys the strip to the inlet of the conveying pipeline. The unloading device includes a first unloading device for conveying the electric shock strip and a second unloading device for conveying the solder contact strip. The first unloading device and the second unloading device have the same conveying speed.

[0008] The interior of the conveying pipeline is sealed and provided with a protective atmosphere. A composite solder heating device for heating the protective atmosphere and a cooling device for cooling the protective atmosphere are sequentially provided in the direction from the inlet to the outlet of the conveying pipeline. A temperature measuring device for measuring the temperature of the protective atmosphere at the location of the composite solder heating device is connected to the conveying pipeline.

[0009] The first unloading device, the second unloading device and the receiving device are automatically controlled by a control system to keep the speed and tension constant.

[0010] Preferably, the conveying pipeline is provided with a protective atmosphere inlet near the inlet, and a protective atmosphere outlet near the outlet.

[0011] Preferably, the cooling device has a cooling liquid inlet and a cooling liquid outlet.

[0012] Preferably, a concave-convex die rolling mill is provided between the conveying pipeline outlet and the material receiving device.

[0013] Preferably, the concave-convex die rolling mill adopts cold rolling, hot rolling or a combination of the two.

[0014] Preferably, a strip width positioning fixture is provided in the conveying pipeline for clamping the contact strip and the composite solder contact strip so that the two are fitted together.

[0015] Preferably, the contact strip has the same width as the solder composite contact strip.

[0016] Preferably, the contact strip is a silver-graphite strip or a silver-graphite-silver-compound strip with a thickness of 2 to 4 mm and a width of 10 to 20 mm.

[0017] Preferably, the composite solder contact strip is a copper strip with a thickness of 0.5 to 2 mm and a width of 10 to 20 mm.

[0018] The beneficial effects of the utility model are as follows: through the above arrangement, the re-soldering processing device re-welds the contact strip and the re-solder strip into one by combining the re-solder heating device with the cooling device. Compared with the compression method of the existing powder metallurgy method, not only is the product consistency good, but it is also not easy to produce pores inside the product, the finished product has high strength and toughness, and it is conducive to the needs of automated production of contact components, has high production efficiency, is easy to manufacture, and can reach a length of 100 to 300 meters. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0020] Figure 1 This is a device diagram of Example 1 of the utility model;

[0021] Figure 2 The finished strip material obtained in Application Example 1;

[0022] Figure 3 The finished strip material obtained in Application Example 2;

[0023] In the figure, 1. first discharge device; 2. second discharge device; 3. composite solder heating device; 4. cooling device; 5. temperature measuring device; 6. concave and convex die rolling mill; 7. material collecting device; 8. conveying pipeline; 41. coolant inlet; 42. coolant outlet; 81. protective atmosphere inlet; 82. protective atmosphere outlet. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0025] Example 1

[0026] like Figure 1, is an embodiment of the utility model, a processing device for a re-soldering contact strip, comprising a feeding device, a receiving device 7 and a control system, a conveying pipe 8 is arranged between the feeding device and the receiving device 7, the conveying pipe 8 has an inlet and an outlet, the feeding device is located at one side of the inlet of the conveying pipe 8 and conveys the strip to the inlet of the conveying pipe 8, the feeding device comprises a first feeding device 1 for conveying the electric shock strip and a second feeding device 2 for conveying the re-soldering contact strip, the first feeding device 1 and the second feeding device 2 have the same conveying speed, the conveying pipe 8 is sealed inside and provided with a protective atmosphere, the conveying pipe 8 is provided with a re-soldering heating device 3 for heating the protective atmosphere and a cooling device 4 for cooling the protective atmosphere in sequence from the inlet to the outlet, the conveying pipe 8 is connected with a temperature measuring device 5 for measuring the temperature of the protective atmosphere at the place corresponding to the re-soldering heating device 3, the first feeding device 1, the second feeding device 2 and the receiving device 7 are automatically controlled by the control system to keep the speed and tension constant.

[0027] Through the above settings, this re-welding processing device re-welds the contact strip and the re-solder strip into one by combining the re-solder heating device with the cooling device. Compared with the compression method of the existing powder metallurgy method, not only the product consistency is good, it is not easy to produce pores inside the product, the finished product has high strength and toughness, and it is conducive to the needs of automated production of contact components, with high production efficiency and easy production. The length can reach 100 to 300 meters. Among them, the temperature measuring device specifically uses infrared temperature measurement to measure the temperature of the protective atmosphere in the conveying pipeline, so as to ensure that the heating temperature is consistent with the set temperature; the re-solder heating device specifically uses high-frequency heating equipment, and the control unit is specifically a PLC controller. Those skilled in the art can make specific settings according to needs, and no further details will be given here.

[0028] The conveying pipeline 8 is provided with a protective atmosphere inlet 81 near the inlet, and a protective atmosphere outlet 82 near the outlet.

[0029] The cooling device 4 has a cooling liquid inlet 41 and a cooling liquid outlet 42 .

[0030] A concave-convex die rolling mill 6 is provided between the outlet of the conveying pipe 8 and the material receiving device 7. The contact surface of the composite solder obtained by processing with the concave-convex die has a special-shaped contact, which is convenient for the subsequent automated production of contact components. According to actual production needs, by selecting the shape of the concave-convex die, a composite solder strip with multiple convex ribs, multiple grooves or multiple patterns can be processed.

[0031] The concave-convex die rolling mill 6 adopts the form of cold rolling, hot rolling or a combination of the two.

[0032] The conveying pipe 8 is provided with a strip width positioning fixture 9 for clamping the contact strip and the composite solder contact strip so that the two are fitted. Through this arrangement, the two are stacked in sequence, fitted tightly, and kept in the same position in the width direction to ensure stable processing.

[0033] The contact strip has the same width as the composite solder contact strip; the contact strip is a silver-graphite strip or a silver-graphite-composite silver strip, with a thickness of 2 to 4 mm and a width of 10 to 20 mm; the composite solder contact strip is a copper strip, with a thickness of 0.5 to 2 mm and a width of 10 to 20 mm.

[0034] Application Example 1

[0035] The processing device for the re-welding contact strip in Example 1 is used to process the silver-graphite-clad copper strip, and the specific processing steps are as follows:

[0036] (1) The width of the top surface of the copper strip and the top surface of the silver-graphite strip are the same;

[0037] (2) Reverse extrusion of the silver-graphite ingot to form a silver-graphite-silver-coated strip having a thickness of 2 mm and a width of 10 mm at 750° C. and a speed of 2.5 m / min;

[0038] (3) Select the copper strip as 0.5mm×10mm×L;

[0039] (4) Remove impurities from the surface of the raw strip;

[0040] (5) High-frequency continuous heating and lamination: Place the silver-graphite composite silver strip and the Cu strip at the corresponding positions of the first unloading device 1 and the second unloading device 2 respectively. The silver-graphite composite silver strip and the Cu strip are stacked together in the same width direction and pass through the composite solder heating device 3, the strip width positioning fixture 9, the cooling device 4, the concave-convex die rolling mill 6 to the receiving device 7 for receiving the AgC / Cu strip, and are fixed firmly on the receiving device 7; set the constant temperature of the composite solder heating device 3 to 700±3℃, and measure the temperature through the temperature measuring device 5, and the temperature measurement method is infrared temperature measurement; introduce ammonia decomposition hydrogen protective atmosphere through the protective atmosphere inlet 81, and the flow rate is 1.5m 3 / h, cooling water is introduced from the cooling liquid inlet 41, cooling water is discharged from the cooling liquid outlet 42, and protective atmosphere is discharged from the protective atmosphere outlet 82.

[0041] After the above steps are completed, the material receiving device 7 is turned on, the strip starts to move evenly, and the speed is in the range of 1.9 to 2.5 m / min. The composite solder heating device 3 is turned on for heating, and constant temperature heating is started to obtain a 1.5 mm×10 mm×L silver-graphite-clad copper strip; the strip is then hot-rolled by the concave-convex die rolling mill 6 to roll out a 0.8 mm×10 mm×L silver-graphite strip and annealed at a speed of 2.5 m / min in a 500°C continuous annealing furnace to obtain the silver-graphite-clad copper strip required for the semi-finished product, wherein the concave-convex die adopts a trapezoidal cross-section die;

[0042] (6) The semi-finished silver-graphite-clad copper strip after rolling is sheared by a shearing process, and the sheared strip is 0.8 mm×2.65 mm×L, and then it is shaped and rolled to obtain a 0.5 mm×2.7 mm×L finished silver-graphite-clad copper strip.

[0043] Finished product Figure 2 As shown, a is the silver-graphite composite silver tape layer, and b is the copper tape layer.

[0044] Application Example 2

[0045] The processing device for the re-welding contact strip in Example 1 is used to process the silver-graphite-clad copper strip, and the specific processing steps are as follows:

[0046] (1) The width of the top surface of the copper strip and the top surface of the silver-graphite strip are the same;

[0047] (2) Reverse extrusion of the silver-graphite ingot to form a silver-graphite-silver-coated strip having a thickness of 2.5 mm and a width of 10 mm at 800° C. and a speed of 3 m / min;

[0048] (3) Select the copper strip as 1mm×10mm×L;

[0049] (4) Remove impurities from the surface of the raw strip;

[0050] (5) High-frequency continuous heating and lamination: Place the silver-graphite composite silver strip and the Cu strip at the corresponding positions of the first unloading device 1 and the second unloading device 2 respectively. The silver-graphite composite silver strip and the Cu strip are stacked together in the same width direction and pass through the composite solder heating device 3, the strip width positioning fixture 9, the cooling device 4, the concave-convex die rolling mill 6 to the receiving device 7 for receiving the AgC / Cu strip, and are fixed firmly on the receiving device 7; set the constant temperature of the composite solder heating device 3 to 700±3℃, and measure the temperature through the temperature measuring device 5, and the temperature measurement method is infrared temperature measurement; introduce ammonia decomposition hydrogen protective atmosphere through the protective atmosphere inlet 81, and the flow rate is 1.5m 3 / h, cooling water is introduced from the cooling liquid inlet 41, cooling water is discharged from the cooling liquid outlet 42, and protective atmosphere is discharged from the protective atmosphere outlet 82.

[0051] After the above steps are completed, the material receiving device 7 is turned on, the strip starts to move evenly, and the speed is in the range of 1.9 to 2.5 m / min. The composite solder heating device 3 is turned on for heating, and constant temperature heating is started to obtain a 1.5 mm×10 mm×L silver-graphite-clad copper strip; the strip is then hot-rolled by the concave-convex die rolling mill 6 to roll out a 1 mm×10 mm×L silver-graphite strip and annealed in a 550°C continuous annealing furnace at a speed of 2.5 m / min to obtain the silver-graphite-clad copper strip required for the semi-finished product, wherein the concave-convex die adopts a semicircular hole cross-section die;

[0052] (6) The semi-finished silver-graphite-clad copper strip after rolling is sheared by a shearing process, and the sheared strip is 1 mm×4 mm×L, and then it is shaped and rolled to obtain a 0.55 mm×4 mm×L finished silver-graphite-clad copper strip.

[0053] Finished product Figure 3 As shown, a is the silver-graphite composite silver tape layer, and b is the copper tape layer.

[0054] Embodiment 3:

[0055] The processing device for the re-welding contact strip in Example 1 is used to process the silver-graphite-clad copper strip, and the specific processing steps are as follows:

[0056] (1) The width of the top surface of the copper strip and the top surface of the silver-graphite strip are the same;

[0057] (2) Reverse extrusion of the silver-graphite ingot to form a silver-graphite-silver-coated strip having a thickness of 3 mm and a width of 20 mm at 850° C. and a speed of 3 m / min;

[0058] (3) Select the copper strip as 2mm×20mm×L;

[0059] (4) Remove impurities from the surface of the raw strip;

[0060] (5) High-frequency continuous heating and lamination: Place the silver-graphite composite silver strip and the Cu strip at the corresponding positions of the first unloading device 1 and the second unloading device 2 respectively. The silver-graphite composite silver strip and the Cu strip are stacked together in the same width direction and pass through the composite solder heating device 3, the strip width positioning fixture 9, the cooling device 4, the concave-convex die rolling mill 6 to the receiving device 7 for receiving the AgC / Cu strip, and are fixed firmly on the receiving device 7; set the constant temperature of the composite solder heating device 3 to 700±3℃, and measure the temperature through the temperature measuring device 5, and the temperature measurement method is infrared temperature measurement; introduce ammonia decomposition hydrogen protective atmosphere through the protective atmosphere inlet 81, and the flow rate is 1.5m 3 / h, cooling water is introduced from the cooling liquid inlet 41, cooling water is discharged from the cooling liquid outlet 42, and protective atmosphere is discharged from the protective atmosphere outlet 82.

[0061] After the above steps are completed, the material receiving device 7 is turned on, the strip starts to move evenly, and the speed is in the range of 1.9 to 2.5 m / min. The composite solder heating device 3 is turned on for heating, and constant temperature heating is started to obtain a 1.5 mm×20 mm×L silver-graphite-clad copper strip; the strip is then rolled by the concave-convex die rolling mill 6 to roll out a 1.2 mm×20 mm×L silver-graphite strip and annealed at a speed of 2.5 m / min in a 550°C continuous annealing furnace to obtain the silver-graphite-clad copper strip required for the semi-finished product, wherein the concave-convex die adopts a semicircular hole cross-section die;

[0062] (6) The semi-finished silver-graphite-copper-clad strip after rolling is sheared by a shearing process, and the sheared strip is 1.2 mm×4 mm×L, and then it is shaped and rolled to obtain a finished silver-graphite-copper-clad strip.

[0063] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A processing device for composite solder contact strip, comprising a material discharge device, a material receiving device (7) and a control system, wherein a conveying pipeline (8) is arranged between the material discharge device and the material receiving device (7), characterized in that: The conveying pipe (8) has an inlet and an outlet. The discharge device is located at one side of the inlet of the conveying pipe (8) and conveys the strip to the inlet of the conveying pipe (8). The discharge device comprises a first discharge device (1) for conveying the electric shock strip and a second discharge device (2) for conveying the solder contact strip. The first discharge device (1) and the second discharge device (2) have the same conveying speed. The interior of the delivery pipe (8) is sealed and provided with a protective atmosphere. The delivery pipe (8) is provided with a composite solder heating device (3) for heating the protective atmosphere and a cooling device (4) for cooling the protective atmosphere in sequence from the inlet to the outlet. The delivery pipe (8) is connected to a temperature measuring device (5) for measuring the temperature of the protective atmosphere at the location corresponding to the composite solder heating device (3). The first unloading device (1), the second unloading device (2) and the collecting device (7) are automatically controlled by a control system to maintain a constant speed and tension.

2. A processing device for a composite solder contact strip according to claim 1, characterized in that: The conveying pipeline (8) is provided with a protective atmosphere air inlet (81) near the inlet, and a protective atmosphere air outlet (82) near the outlet.

3. The processing device for a composite solder contact strip according to claim 1, characterized in that: The cooling device (4) has a cooling liquid inlet (41) and a cooling liquid outlet (42).

4. The processing device for a composite solder contact strip according to claim 1, characterized in that: A concave-convex die rolling mill (6) is provided between the outlet of the conveying pipeline (8) and the material receiving device (7).

5. A processing device for a composite solder contact strip according to claim 4, characterized in that: The concave-convex die rolling mill (6) adopts the form of cold rolling, hot rolling or a combination of the two.

6. The processing device for a composite solder contact strip according to claim 1, characterized in that: The conveying pipe (8) is provided with a strip width positioning fixture (9) for clamping the contact strip and the composite solder contact strip so that the two are fitted together.

7. The processing device for a composite solder contact strip according to claim 1, characterized in that: The contact strip has the same width as the resolder contact strip.

8. The processing device for a composite solder contact strip according to claim 1, characterized in that: The contact strip is a silver-graphite strip or a silver-graphite-silver-compounded strip with a thickness of 2 to 4 mm and a width of 10 to 20 mm.

9. The processing device for a composite solder contact strip according to claim 1, characterized in that: The composite solder contact strip is a copper strip with a thickness of 0.5 to 2 mm and a width of 10 to 20 mm.

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