Brazing device for lamp manufacturing technology

Abstract

The utility model discloses a brazing device for lamp manufacturing technology, which comprises a base, a protective cover, a heating device, a fixed die and a vacuumizing device, the fixed die and the protective cover are mounted on the base, a workpiece to be welded is fixed on the fixed die, and the fixed die is positioned in the protective cover; the heating device is located outside the protective cover and used for heating the to-be-welded workpiece in the protective cover. The base is provided with an air exhaust hole, and the air exhaust hole is communicated with the interior of the protective cover and used for vacuumizing the interior of the protective cover. The method comprises the following steps of: firstly, fixing a fixed mold on a base for placing and fixing workpieces to be welded, filling a brazing material between the workpieces to be welded, buckling a protective cover on the base, and keeping the workpieces to be welded in the protective cover; and then a vacuumizing device is adopted to vacuumize the interior of the protective cover through an air exhaust hole from the beginning of machining, a heating device is used for heating the exterior of the protective cover, and the brazing material can flow between the workpieces to be welded after being molten into a liquid state, so that the welding work of the two workpieces to be welded is completed.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding, and particularly relates to a brazing device for lamp manufacturing technology. Background Art

[0002] At present, the brazing equipment on the market cannot meet the requirements of lamp manufacturing, and the process requirements cannot be achieved during welding. At the same time, material leakage is likely to occur during the brazing process of lamp manufacturing. Therefore, a mature and stable brazing process is required for lamp manufacturing to make the molten liquid brazing material wet and diffuse within a suitable range, and the welding is firm to meet the requirements.

[0003] The current mainstream tungsten-molybdenum welding method during lamp manufacturing is as follows: the front end of the molybdenum rod has a slope shape. The molybdenum ring is placed on the slope of the molybdenum rod, and a heavy object is used to press the molybdenum ring, and welding material is wound around it. In this way, the molten brazing material is likely to diffuse outside the specified range during welding, the concentricity is likely to deviate, and the load-bearing capacity of the molybdenum ring is insufficient, and there may be a risk of deformation in subsequent processes. Then the whole welded part is sealed into a quartz glass tube, and it is held by hand and placed at the heating position of the high-frequency brazing coil. This kind of welding has problems such as oxidation, a large amount of impurities and impurity gases, etc. In subsequent lamp manufacturing processes, other treatments such as hydrogen burning are required, the process is complex, and a large amount of manpower and material resources are wasted.

[0004] Therefore, it is necessary to research a kind of welding that is firm, the welding material can be relatively pure, effectively reduce the process steps, shorten the process time, and improve the production efficiency. Summary of the Utility Model

[0005] In order to solve the many technical problems such as deformation, oxidation, and impurities existing in the current hand-held brazing in the background lamp manufacturing technology, the purpose of the utility model is to provide a brazing device for lamp manufacturing technology, which can solve the above problems.

[0006] The technical solution for achieving the purpose of the utility model is: a brazing device for lamp manufacturing technology, including a base, a protective cover, a heating device, a fixing mold, and a vacuum pumping device. The fixing mold and the protective cover are installed on the base, the workpiece to be welded is fixed on the fixing mold, and the fixing mold is located inside the protective cover; the heating device is located outside the protective cover and is used to heat the workpiece to be welded inside the protective cover; there is a vacuum pumping hole on the base, and the vacuum pumping hole communicates with the inside of the protective cover and is used to pump vacuum inside the protective cover.

[0007] In the fixed mold of this lamp manufacturing technical solution, it is first fixed on the base, used to place and fix the workpieces to be welded, such as molybdenum rods, tungsten rods, molybdenum blocks or tungsten blocks, etc. After filling the brazing filler metal between the workpieces to be welded, the protective cover is buckled on the base to keep the workpieces to be welded inside the protective cover; then the vacuum pumping device adopted starts to pump the air in the protective cover through the air extraction hole from the beginning of the processing, and the heating device heats outside the protective cover. As the brazing filler metal melts into a liquid state, it will flow into the space between the workpieces to be welded, completing the welding work of the two workpieces to be welded. Since the vacuum pumping device continuously pumps the air during the welding process, there will be no problems such as oxidation, excessive impurities and impurity gases. And it does not require manual holding, has a simple structure and convenient operation, greatly improving the welding quality and efficiency.

[0008] Further, the fixed mold includes a support table and a heat insulation table, and the heat insulation table is installed between the support table and the base. The heat insulation table can reduce heat transfer and prevent the base from being affected by high temperature.

[0009] Further, the material of the heat insulation table is a high-temperature resistant non-metallic material, which can be ceramics, and can effectively play a heat insulation role.

[0010] Further, the base has an installation groove, and the bottom of the fixed mold is installed in the installation groove. The installation groove and the inside of the protective cover form a welding cavity, and the vacuum pumping device is communicated with the welding cavity. First, the installation groove can facilitate the fixed installation of the fixed mold on the base, and the formed welding cavity is larger, suitable for workpieces to be welded of different sizes.

[0011] Further, it also includes an elastic sealing ring. A sealing groove is provided on the base, and the bottom of the protective cover is pressed against the sealing groove; the elastic sealing ring is installed in the sealing groove, and the elastic sealing ring protrudes from the sealing groove in its natural state. When the bottom of the protective cover is pressed against the elastic sealing ring, the elastic sealing ring can play a sealing role to prevent air from entering the protective cover through the gap between the protective cover and the base, causing problems such as welding oxidation.

[0012] Further, the base has a limiting groove, and the bottom of the protective cover has an outwardly extending support portion, and the support portion is fixed in the limiting groove. The limiting groove not only facilitates the installation of the protective cover on the base, but also can play a certain sealing role due to the formation of a step at the edge of the limiting groove.

[0013] Furthermore, the order of the molybdenum rod and the molybdenum block is that the molybdenum rod vertically presses the molybdenum block. Using a molybdenum block to replace the traditional molybdenum ring solves the problems of easy leakage, overflow, and substandard concentricity in molybdenum ring welding. For example, when the two workpieces to be processed are a molybdenum block and a molybdenum rod, the molybdenum block is first placed on the support table, and then the molybdenum rod is placed on the molybdenum block. Brazing material is sprinkled on the connection between the two. Since the high-frequency coil has a fast heating speed, the position of the high-frequency coil is set above the support table, and the temperature is transferred from the molybdenum rod to the molybdenum block. The brazing material flows into the gap between the two during gradual melting, so that a large amount of brazing material will not melt suddenly and not enter the gap between the two in time. In addition, a groove is set on the molybdenum block, and an appropriate amount of brazing material is filled in the groove. Then the end of the molybdenum rod is buried in the groove. In this way, the melted brazing material can be better controlled not to flow out of a reasonable area, and there will be no leakage and other problems, which can save costs.

[0014] Furthermore, the heating device is a high-frequency coil, which is sleeved on the outside of the protective cover and is located above the fixed mold. Specifically, a high-frequency machine can be used to drive the high-frequency coil to generate heat to heat the brazing material of the protective cover. Since the high-frequency coil has a fast heating speed, the high-frequency coil is set above the support table, and the temperature is transferred from the molybdenum rod to the molybdenum block. The brazing material gradually melts and flows into the gap between the two workpieces to be welded, and the welding is completed after cooling. Due to high-frequency heating in a vacuum, oxidation, impurities, and impurity gases are effectively reduced, and the subsequent material removal process is directly reduced, saving cost and time. The diameter of the high-frequency coil, the current of the high-frequency machine, the heating time, etc. are adaptively adjusted according to actual conditions.

[0015] Furthermore, the vacuum pumping device includes a first vacuum pump and a molecular pump, the vacuum pump and the molecular pump are connected through a first air pipe and communicate with the inside of the protective cover through the air extraction hole. When vacuuming is required, the vacuum pump is started, and the inside of the protective cover is vacuumed after the molecular pump to ensure welding quality.

[0016] Furthermore, the base has an air supply hole, and the brazing device also includes an air supply device, which includes a gas cylinder, a second vacuum pump and a molecular pump. The gas cylinder, the second vacuum pump and the molecular pump are connected in sequence through a second air pipe, and the second air pipe is connected to the protective cover through the air supply hole. The air supply device mainly transmits the inert gas, such as nitrogen, in the gas cylinder to the protective cover through the second vacuum pump and the molecular pump after the welding is completed. The protective cover filled with inert gas can be opened, and then the welded workpiece can be taken out. The inert gas will not cause oxidation problems on the welding parts of the high-temperature welding workpieces.

[0017] Further, the protective cover is a glass cover, which facilitates heating of the high-frequency coil outside it and is suitable for vacuum sealing, etc.

[0018] By adopting the above technical solutions, the utility model has the following beneficial effects:

[0019] (1) A fixed mold for fixing the workpiece to be welded is provided, and the protective cover is buckled and sealed on the base, achieving the effect of vacuum sealing and welding;

[0020] (2) Further, a sealing and limiting groove is provided on the base, and an elastic sealing ring is installed in the installation groove, further playing a sealing role;

[0021] (3) The brazing part is placed in the alternating magnetic field of the high-frequency induction heating device, and the brazing temperature of the welded part is provided by the resistance heat generated by the induced current in the alternating magnetic field, and the heating temperature is controlled by adjusting the heating current;

[0022] (4) A vacuum pumping device and a gas supply device are designed, which are convenient for pumping vacuum during welding, and filling inert gas after cooling is convenient for taking out the welded workpiece; Description of the Drawings

[0023] In order to make the content of the utility model easier to be clearly understood, the following further details the utility model according to specific embodiments in conjunction with the drawings, where

[0024] Figure 1 is the structural sectional view of the brazing device in the utility model;

[0025] Figure 2 is the structural schematic diagram of the air extraction hole and the air supply hole on the base in the utility model;

[0026] Figure 3 is the sectional view of the base in the utility model;

[0027] Figure 4 is the overall structural schematic diagram of the brazing device in the utility model.

[0028] The reference numerals in the drawings are: 1 base; 2 protective cover; 3 fixed mold; 4 molybdenum rod; 5 molybdenum block; 6 support table; 7 heat insulation table; 8 installation groove; 9 welding cavity; 10 sealing groove; 11 elastic sealing ring; 12 limiting groove; 13 support part; 14 air extraction hole; 15 air supply hole. Detailed Description of the Embodiment

[0029] Embodiment:

[0030] As Figure 1 and Figure 4As shown in the figure, this embodiment provides a brazing device for lamp manufacturing technology, which includes a base 1, a protective cover 2, a heating device, a fixing die 3 and a vacuum pumping device. The fixing die 3 and the protective cover 2 are installed on the base 1. The workpiece to be welded is fixed on the fixing die 3, and the fixing die 3 is located inside the protective cover 2. The heating device is located outside the protective cover 2 and is used to heat the workpiece to be welded inside the protective cover 2. The base 1 is provided with a vacuum pumping hole 14, and the vacuum pumping hole 14 communicates with the inside of the protective cover 2 for pumping vacuum inside the protective cover 2. In the technical solution, the fixing die 3 is first fixed on the base 1 and is used to place and fix the workpiece to be welded, such as a molybdenum rod 4, a tungsten rod, a molybdenum block 5 or a tungsten block, etc. After filling the brazing filler metal between the workpieces to be welded, the protective cover 2 is buckled on the base 1 to keep the workpiece to be welded inside the protective cover 2. Then, the vacuum pumping device is used to pump vacuum inside the protective cover 2 through the vacuum pumping hole 14 from the beginning of the processing, and the heating device heats outside the protective cover 2. As the brazing filler metal melts into a liquid state, it will flow between the workpieces to be welded to complete the welding work of the two workpieces to be welded. Since the vacuum pumping device continuously pumps vacuum during the welding process, there will be no problems such as oxidation, excessive impurities and impurity gases. And it does not require manual holding, has a simple structure and convenient operation, greatly improving the welding quality and efficiency.

[0031] Preferably, the fixing die 3 includes a support table 6 and a heat insulation table 7, and the heat insulation table 7 is installed between the support table 6 and the base 1. The heat insulation table 7 can reduce heat transfer and prevent the base 1 from being affected by high temperature.

[0032] Preferably, the material of the heat insulation table 7 is a high-temperature resistant non-metallic material, which can be ceramics and can effectively play a heat insulation role.

[0033] Preferably, the heating device is a high-frequency coil, which is sleeved outside the protective cover 2 and is located above the fixed mold 3. Specifically, a high-frequency machine can be used to connect and drive the high-frequency coil to generate heat, heating the brazing filler metal of the protective cover 2 until it melts and then flowing into the gap between the two workpieces to be welded. After cooling, the welding is completed. When the two workpieces to be processed are a molybdenum block 5 and a molybdenum rod 4 respectively, first place the molybdenum block 5 on the support table 6, and then place the molybdenum rod 4 on the molybdenum block 5. Apply brazing filler metal at the connection between the two. Since the high-frequency coil has a fast heating speed, the position of the high-frequency coil is set above the support table 6, and the temperature is transmitted from the molybdenum rod 4 to the molybdenum block 5 direction. The brazing filler metal gradually melts and flows into the gap between the two, so that a large amount of brazing filler metal will not suddenly melt and fail to enter the gap between the two in time. In addition, a groove can be provided on the molybdenum block 5, and an appropriate amount of brazing filler metal can be filled in the groove, and then the end of the molybdenum rod 4 is buried in the groove, so that it is better to control the melted brazing filler metal from flowing out of the reasonable area range. The diameter of the high-frequency coil, the current of the high-frequency machine, the heating time, etc. are adjusted adaptively according to the actual situation.

[0034] As Figure 3 As shown, the base 1 has an installation groove 8, the bottom of the fixed mold 3 is installed in the installation groove 8, and a welding cavity 9 is formed inside the installation groove 8 and the protective cover 2. The vacuum pumping device communicates with the welding cavity 9. First, the installation groove 8 can facilitate the fixed installation of the fixed mold 3 on the base 1, and the formed welding cavity 9 is larger, which is suitable for welding workpieces of different sizes.

[0035] Preferably, an elastic sealing ring 11 is further included. A sealing groove 10 is provided on the base 1, and the bottom of the protective cover 2 is press-fitted on the sealing groove 10; the elastic sealing ring 11 is installed in the sealing groove 10, and the elastic sealing ring 11 protrudes from the sealing groove 10 in the natural state. When the bottom of the protective cover 2 is press-fitted on the elastic sealing ring 11, the elastic sealing ring 11 can play a sealing role to prevent air from entering the protective cover 2 from the gap between the protective cover 2 and the base 1, causing problems such as welding oxidation.

[0036] The base 1 has a limiting groove 12, and the bottom of the protective cover 2 has an outwardly extending support portion 13, and the support portion 13 is fixed in the limiting groove 12. The limiting groove 12 not only facilitates the installation of the protective cover 2 on the base 1, but also can play a certain sealing role due to the formation of a step at the edge of the limiting groove 12.

[0037] As Figures 2-4As shown, the evacuation device includes a first vacuum pump and a molecular pump. The vacuum pump and the molecular pump are connected by a first air pipe and communicate with the inside of the protective cover 2 through the evacuation hole 14. When evacuation is required, the vacuum pump is started, and after passing through the molecular pump, the inside of the protective cover 2 is evacuated to ensure the welding quality.

[0038] Preferably, the base 1 is provided with an air supply hole 15. The brazing device further includes an air supply device. The air supply device includes a gas cylinder, a second vacuum pump and a molecular pump. The gas cylinder, the second vacuum pump and the molecular pump are sequentially connected by a second air pipe, and the second air pipe communicates with the inside of the protective cover 2 through the air supply hole 15. The air supply device is mainly used to transmit the inert gas in the gas cylinder, such as nitrogen, into the protective cover 2 through the second vacuum pump and the molecular pump after welding is completed. After the protective cover 2 is filled with inert gas, it can be opened, and then the welded workpiece can be taken out. The inert gas will not oxidize the welded part of the high-temperature welded workpiece.

[0039] Preferably, the protective cover 2 is a glass cover, which is convenient for the high-frequency coil to heat outside it and is suitable for evacuation and sealing, etc.

[0040] Working principle: The workpiece to be welded is placed on the support table 6 and filled with brazing filler metal. Then the evacuation device is started, and the high-frequency coil heats outside the protective cover 2. After the brazing filler metal melts, it enters the pores between the two workpieces to be welded. After cooling, the welding is completed. The brazing part in this device is placed in the alternating magnetic field of the high-frequency induction heating equipment. The resistance heat generated by the induced current in the alternating magnetic field provides the brazing temperature of the welded part. The heating current is adjusted to control the heating temperature, and heating, heat preservation and cooling are carried out in a vacuum. After heating, the brazing filler metal melts into the gap of the hole, effectively preventing the high-temperature oxidation phenomenon during the brazing process and realizing the effective brazing of materials such as tungsten and molybdenum.

[0041] The specific embodiments described above have further elaborated on the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A soldering device for lamp manufacturing technology, characterized in that: The invention comprises a base (1), a protective cover (2), a heating device, a fixed mold (3) and a vacuum device, wherein the fixed mold (3) and the protective cover (2) are mounted on the base (1), a workpiece to be welded is fixed on the fixed mold (3), and the fixed mold (3) is located inside the protective cover (2); the heating device is located outside the protective cover (2) and is used for heating the workpiece to be welded inside the protective cover (2); the base (1) is provided with an exhaust hole (14), and the exhaust hole (14) is connected to the inside of the protective cover (2) and is used for vacuuming the inside of the protective cover (2).

2. A soldering device for lamp manufacturing technology according to claim 1, characterized in that: The fixed mold (3) comprises a support platform (6) and a heat insulation platform (7), and the heat insulation platform (7) is installed between the support platform (6) and the base (1).

3. A soldering device for lamp manufacturing technology according to claim 2, characterized in that: The heat insulation platform (7) is made of high temperature resistant non-metallic material.

4. A soldering device for lamp manufacturing technology according to claim 1, characterized in that: The base (1) has a mounting groove (8), the bottom of the fixed mold (3) is mounted in the mounting groove (8), the mounting groove (8) and the interior of the protective cover (2) form a welding cavity (9), and the vacuum device is connected to the welding cavity (9).

5. A soldering device for lamp manufacturing technology according to claim 1, characterized in that: It also comprises an elastic sealing ring (11); a sealing groove (10) is provided on the base (1); the bottom of the protective cover (2) is pressed onto the sealing groove (10); the elastic sealing ring (11) is installed in the sealing groove (10); the elastic sealing ring (11) in a natural state protrudes from the sealing groove (10).

6. A soldering device for lamp manufacturing technology according to claim 1, characterized in that: The base (1) is provided with a limiting groove (12), and the bottom of the protective cover (2) is provided with a supporting portion (13) extending outwards, and the supporting portion (13) is fixed in the limiting groove (12).

7. A soldering device for lamp manufacturing technology according to claim 1, characterized in that: The heating device is a high-frequency coil, the high-frequency coil is sleeved outside the protective cover (2), and the high-frequency coil is located above the fixed mold (3).

8. A soldering device for lamp manufacturing technology according to claim 1, characterized in that: The vacuum pumping device comprises a first vacuum pump and a molecular pump, the vacuum pump and the molecular pump are connected via a first air pipe and communicate with the inside of the protective cover (2) via the air extraction hole (14).

9. A soldering device for lamp manufacturing technology according to claim 1, characterized in that: The base (1) has an air supply hole (15), and the brazing device also includes an air supply device, which includes a gas cylinder, a second vacuum pump and a molecular pump. The gas cylinder, the second vacuum pump and the molecular pump are connected in sequence through a second air pipe, and the second air pipe is connected to the inside of the protective cover (2) through the air supply hole (15).

10. A soldering device for lamp manufacturing technology according to claim 1, characterized in that: The protective cover (2) is a glass cover.

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