Vacuum soft soldering system for rapid welding of connector and temperature control method

Abstract

The invention relates to a vacuum soft soldering system and a temperature control method for rapid welding of a connector, and belongs to the technical field of vacuum soft soldering. The vacuum soft soldering system comprises a vacuum chamber and a heating platform arranged in the vacuum chamber, a heating body is installed in the heating platform, and the heating platform is used for containing a welding base body; the welding base body is heated in a heat conduction mode; the hot air circulating system comprises a high-temperature-resistant fan and a heating source, the heating source is used for heating air in the vacuum chamber, the high-temperature-resistant fan circulates the air in the vacuum chamber through a hot air adjusting hose, and melting welding is conducted on molten brazing filler metal between the welding base body and the connector by conveying heat of hot air circulation. The brazing filler metal in the connector and the welding base body is heated through heat convection; the temperature of the heating platform and the hot air circulation system is controlled by the temperature control system. The corresponding heating platform and the hot air circulating system are designed in the vacuum chamber, overall heating or local heating can be selectively carried out, and the welding efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of soft soldering, and in particular to a vacuum soft soldering system and a temperature control method for fast connector welding. Background Art

[0002] With the continuous improvement of welding technology in the market, the existing welding technology (laser welding) on ​​the market can no longer meet the market demand. The traditional connector soft soldering device uses laser as a heat source to melt the solder, and the melted solder is cooled to connect the workpiece and the connector. The heating of the solder is to use laser as a heat source to melt the solder. Due to the high energy density and strong penetration ability of laser welding, the workpiece and the connector are prone to thermal cracks due to the mismatch of physical and metallurgical properties after laser welding. At present, laser welding can only be performed locally in the atmosphere with a protective gas purge. The workpiece is very easy to oxidize after welding, thus failing to meet the use requirements.

[0003] At present, the existing connector welding methods on the market use laser welding and soft soldering. Both methods require the use of solder + flux, or the use of lead-containing solder to improve the wetting performance of the solder on the workpiece surface. For occasions that explicitly require lead-free solder, the above processes cannot meet the requirements.

[0004] Furnace brazing is a feasible method for lead-free connector welding. However, furnace brazing uses overall heating, has slow welding efficiency, narrow application range, high cost, and it is not intuitive to observe the welding effect.

[0005] Traditional vacuum brazing technology mainly heats the thermal field during product brazing as a whole, that is, the temperature of the internal brazing thermal field is always kept consistent, and two different temperatures cannot be set at the same time in the thermal field, such as 180°C and 260°C. When connectors are welded, the main materials are copper alloy (connector material), brazing material and substrate (stainless steel or titanium alloy). When the connector needs to be welded to the substrate, the required temperatures will not be the same.

[0006] Therefore, there is an urgent need to develop a vacuum soldering system specifically for fast connector welding on the market. Summary of the invention

[0007] In order to solve the shortcomings and deficiencies of the prior art, a vacuum soft soldering system and a temperature control method for rapid connector welding are provided, so that after the workpiece and the connector are welded by solder, the performance of the workpiece and the connector themselves changes little (almost no change), and the connection performance of the workpiece and the connector after welding is reliable. During the entire welding process, the surfaces of the workpiece and the connector will not be oxidized by the atmosphere, thereby improving the welding quality.

[0008] A vacuum soft soldering system for rapid connector welding is provided to achieve the purpose of the present invention, comprising a vacuum chamber and a vacuum system for evacuating the vacuum chamber, a hot air circulation system, an inert gas fast filling system and a heating platform arranged in the vacuum chamber, wherein a heating element is installed inside the heating platform, the heating platform is used to accommodate a welding substrate, and heats the welding substrate by heat conduction; the hot air circulation system comprises a high temperature resistant fan and a heat source, the heat source is used to heat the air in the vacuum chamber, the high temperature resistant fan circulates the air in the vacuum chamber through a hot air regulating hose, melts and welds the molten solder between the welding substrate and the connector by conveying the heat of the hot air circulation, and heats the connector and the solder inside the welding substrate by thermal convection; the temperature of the heating platform and the hot air circulation system is controlled by a temperature control system.

[0009] In the welding process between the welding substrate and the connector, the present technical solution adopts a vacuum chamber structure, evacuates the vacuum chamber, and fills it with inert gas to ensure that the surfaces of the workpiece and the connector are not oxidized during the welding process, so that after the workpiece and the connector are welded by the solder, the performance of the workpiece and the connector themselves changes little (almost no change), and the connection performance of the workpiece and the connector after welding is reliable, thereby improving the welding performance of the connector; The corresponding heating platform and hot air circulation system are designed in the vacuum chamber, which can selectively perform overall heating or local heating. It has high welding efficiency, is applicable to a wide range of structures, has good post-welding quality, and the welding process can be adjusted in real time.

[0010] As a further improvement of the above solution, the heating platform is formed by covering an upper platform and a lower platform, and the contacting surfaces of the upper platform and the lower platform are both provided with a receiving groove for accommodating the welding matrix. The heating element is arranged in the upper platform and the lower platform.

[0011] Through the above technical solution, the heating elements are symmetrically distributed in the upper platform and the lower platform, so that the upper and lower surfaces of the welding substrate can be heated simultaneously and evenly.

[0012] The specific structure of each part system in this technical solution is as follows: Hot air circulation system: The heat source can be set as a heating resistance wire, which is used to heat the air in the vacuum chamber, and then the hot air is transported to the molten solder surface between the welding substrate and the connector through a high-temperature resistant fan and a hot air regulating hose for melting and welding. The temperature of the hot air circulation system can reach up to 500°C, and the temperature control accuracy is ±5°C; Vacuum system: includes vacuum pump unit, stainless steel bellows and vacuum gauge. The vacuum pump unit is connected to the vacuum chamber through KF sealing flange. During the connector soldering process, it is used to evacuate the inside of the vacuum chamber. The vacuum gauge is responsible for detecting the vacuum degree in the vacuum chamber and providing vacuum signals to the control system. Inert gas fast filling system: It is mainly composed of an inert gas storage tank, a control valve and stainless steel pipelines. The inert gas storage tank is used to store inert gas. The inert gas is controlled to enter the vacuum chamber through the control system. The inert gas fast filling system is used to fill the vacuum chamber with inert gas to prevent the welding substrate and the connector surface from being oxidized during the connector soldering process. Heating platform: It is made of A6061 aluminum alloy material, with grooves inside to install heating elements. The heating elements can be set as heating resistance wires. The heating platform is heated by the heating resistance wires. The maximum heating temperature of the heating platform is 500℃. The welding substrate is placed on the heating platform, and the heating platform heats the welding substrate as a whole through heat conduction. The heating platform is provided with a plurality of mounting holes arranged in a rectangular array.

[0013] Hot air regulating hose: mainly transmits the heat of hot air circulation to melt the molten solder between the workpiece and the connector for welding. The pipeline is made of stainless steel hose, and the position can be adjusted by manual operation. Two pipelines are reserved, and up to three connectors can be welded in the same welding matrix. If necessary, more can be added.

[0014] As a further improvement of the above solution, the heating elements are symmetrically distributed within the heating platform.

[0015] Specifically, in one embodiment, the groove in the heating platform for mounting the heating element is formed by connecting a plurality of transverse rectangular grooves and longitudinal rectangular grooves.

[0016] As a further improvement of the above solution, the temperature control system includes a PID temperature controller, a temperature measuring thermocouple group, and a temperature recorder.

[0017] As a further improvement of the above scheme, the temperature measuring thermocouple group includes a heating platform thermocouple, a hot air circulation system thermocouple, a workpiece thermocouple, and a connector surface thermocouple. The heating platform thermocouple is used to measure the temperature of the heating platform surface; the hot air circulation system thermocouple is used to measure the temperature inside the vacuum chamber; the workpiece thermocouple is used to measure the temperature inside the welding substrate; and the connector surface thermocouple is used to measure the temperature of the connector surface.

[0018] PID temperature controller: The temperature controller is a modular, freely configurable, high-precision, high-performance temperature and process controller. The PID temperature controller is used to achieve multi-stage closed-loop temperature control. Temperature recorder: used to receive signals from the temperature control instrument, record all temperatures during the connector welding process in real time, and form corresponding curves for easy viewing after welding.

[0019] It is a routine operation for technicians in this field to realize temperature monitoring and control of the heating platform and hot air circulation system through the cooperation of PID temperature controller, temperature measuring thermocouple group and temperature recorder in combination with the existing control system.

[0020] For example, STC12C5A60S2 is used as the single-chip microcomputer control chip, DC 24 V voltage is used for power supply, MOS tube power drive circuit is designed, the temperature of the heating platform is obtained by using the heating platform thermocouple, the heating mode and temperature can be set, and the PID algorithm is used to adjust the heating curve to form a closed-loop control, so as to achieve the purpose of uniformly heating the welding substrate through heat conduction on the heating platform.

[0021] As a further improvement of the above solution, the vacuum chamber adopts an inner and outer layer structure, the inner layer is welded from SUS304 stainless steel material, and the outer layer is welded from Q235A cold-rolled steel plate material.

[0022] As a further improvement of the above solution, aerogel insulation cotton material is filled between the inner and outer structures of the vacuum chamber.

[0023] Aerogel insulation wool material can keep warm and prevent fire.

[0024] As a further improvement of the above solution, the vacuum chamber is designed with a front observation window door.

[0025] This solution not only makes it easier to put the welding substrate in, but also allows the operator to observe the connector welding process through the observation window at any time during the welding process.

[0026] A temperature control method for a vacuum soldering system for rapid connector welding comprises the following steps: Step 1: Turn on the power supply and gas supply, and check before powering on the equipment; Step 2: Control the vacuum pump of the vacuum system to start and evacuate the vacuum chamber; Step 3: When the vacuum degree reaches 0.01Mpa, turn off the vacuum pump and open the inert gas inlet valve; Step 4: When the vacuum degree reaches 0.1Mpa, close the inert gas inlet valve, control the heating element inside the heating platform to work, and turn on the hot air circulation system switch after the temperature of the heating platform reaches the target temperature; Step 5: After the hot air circulation system reaches the set temperature, input the welding time into the control system Step 6: When the welding time is reached, turn off the hot air circulation system and stop heating; Step 7: When the workpiece surface temperature reaches 50°C, open the front observation window of the vacuum chamber and take out the welded workpiece.

[0027] The beneficial effects of the present invention are: Compared with the prior art, the vacuum soldering system and temperature control method for rapid connector welding provided by the present invention have the following advantages: 1. During the welding process between the welding base and the connector, a vacuum chamber structure is adopted to evacuate the vacuum chamber and fill it with inert gas to ensure that the surfaces of the workpiece and the connector are not oxidized during the welding process. After the workpiece and the connector are welded by the solder, the performance of the workpiece and the connector themselves changes little (almost no change), and the connection performance of the workpiece and the connector after welding is reliable, thereby improving the welding performance of the connector; 2. Design the corresponding heating platform and hot air circulation system in the vacuum chamber, which can selectively perform overall heating or local heating. It has high welding efficiency, wide applicable structure, good post-welding quality, and the welding process can be adjusted in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 It is a structural schematic diagram of this technical solution; Figure 2 This is a schematic diagram of the three-dimensional structure of the heating platform of this technical solution; Figure 3 This is an exploded schematic diagram of the upper platform, lower platform, welding base and connector of the technical solution; Figure 4 It aims to reflect the positional relationship between the heating element inside the heating platform and the welding substrate and connector; Figure 5 This is a flow chart of the temperature control method of this technical solution.

[0029] Description of reference numerals: 1-vacuum chamber, 2-heating platform, 3-welding substrate, 4-connector, 5-vacuum system, 6-heating platform thermocouple, 7-hot air circulation system thermocouple, 8-workpiece thermocouple, 9-connector surface thermocouple, 10-hot air circulation system, 11-hot air regulating hose, 12-inert gas fast charging system, 21-upper platform, 22-lower platform. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments disclosed in this technical solution, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] When the connector is vacuum soldered by the present technical solution, the welding base 3 is first heated by heat conduction through the heating platform 2. After the temperature inside the welding base 3 reaches a certain temperature, the control system automatically opens the valve of the hot air circulation system 10 and the conveying fan through the temperature detected by the thermocouple inside the workpiece thermocouple 8 (when the heating platform 2 heats the welding base 3, the hot air circulation system 10 is turned on at the same time. After the hot air circulation system 10 reaches the set temperature, the temperature is automatically maintained, and it is necessary to wait for the welding base 3 to reach the set temperature). At this time, the hot air is conveyed to the connector 4 and the solder inside the welding base 3 through the high temperature resistant fan and the hot air regulating hose 11, and the solder begins to melt and weld. During this conveying process, the control system will set the time of hot air conveyance according to the welding process and formula, and ensure the quality of vacuum soldering of the connector 4 by adjusting the time parameters.

[0032] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0033] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0034] Embodiment 1 of this technical solution: like Figure 1 As shown, the vacuum soldering system for connector rapid welding provided by the present invention includes a vacuum chamber 1 and a vacuum system 5 for evacuating the vacuum chamber 1, a hot air circulation system 10, an inert gas rapid filling system 12, and a heating platform 2 arranged in the vacuum chamber 1. Figure 2 , Figure 3As shown, the heating platform 2 is composed of an upper platform 21 and a lower platform 22, and the contacting surfaces of the upper platform 21 and the lower platform 22 are provided with a receiving groove for accommodating the welding substrate 3. The upper platform 21 and the lower platform 22 are both equipped with heating elements. The upper platform 21 and the lower platform 22 are used to accommodate the welding substrate 3 and heat the welding substrate 3 by heat conduction; the hot air circulation system 10 includes a high-temperature resistant fan and a heat source, and the heat source is used to heat the air in the vacuum chamber 1. The high-temperature resistant fan circulates the air in the vacuum chamber 1 through the hot air regulating hose 11, and melts and welds the molten solder between the welding substrate 3 and the connector 4 by conveying the heat of the hot air circulation, and heats the connector 4 and the solder inside the welding substrate 3 by thermal convection; the temperature of the heating platform 2 and the hot air circulation system 10 is controlled by a temperature control system.

[0035] In the welding process between the welding base 3 and the connector 4, the present technical solution adopts the vacuum chamber 1 structure, evacuates the vacuum chamber 1 and fills it with inert gas, so as to ensure that the surfaces of the workpiece and the connector 4 are not oxidized during the welding process, so that after the workpiece and the connector 4 are welded by the brazing filler metal, the performance of the workpiece and the connector 4 themselves changes little (almost no change), and the connection performance between the workpiece and the connector 4 after welding is reliable, thereby improving the welding performance of the connector 4; like Figure 4 As shown, the heating elements are symmetrically distributed in the upper platform 21 and the lower platform 22, so that the upper and lower surfaces of the welding substrate 3 can be heated simultaneously and evenly.

[0036] A corresponding heating platform 2 and a hot air circulation system 10 are designed in the vacuum chamber 1, which can selectively perform overall heating or local heating, with high welding efficiency, wide applicable structures, good post-welding quality, and the welding process can be adjusted in real time.

[0037] The specific structure of each part system in this technical solution is as follows: Hot air circulation system 10: The heat source can be set as a heating resistance wire, which is used to heat the air in the vacuum chamber 1, and then the hot air is transported to the molten solder surface between the welding substrate 3 and the connector 4 through a high temperature resistant blower and a hot air regulating hose 11 for melting and welding. The temperature of the hot air circulation system 10 can reach up to 500°C, and the temperature control accuracy is ±5°C; Vacuum system 5: includes a vacuum pump unit, a stainless steel bellows and a vacuum gauge. The vacuum pump unit is connected to the vacuum chamber 1 through a KF sealing flange. During the soldering process of the connector 4, it is used to evacuate the inside of the vacuum chamber 1. The vacuum gauge is responsible for detecting the vacuum degree in the vacuum chamber 1 and providing a vacuum signal to the control system. The inert gas fast-filling system 12 is mainly composed of an inert gas storage tank, a control valve, and a stainless steel pipeline. The inert gas storage tank is used to store inert gas. The inert gas is controlled to enter the vacuum chamber 1 through a control system. The inert gas fast-filling system 12 is used to fill the vacuum chamber 1 with inert gas, so as to prevent the welding substrate 3 and the surface of the connector 4 from being oxidized during the soldering process of the connector 4. Heating platform 2: A6061 aluminum alloy material is used as the main body, a groove is provided inside, and a heating element is installed. The heating element can be set as a heating resistance wire, and the heating platform 2 is heated as a whole through the heating resistance wire. The heating temperature of the heating platform 2 is up to 500°C. The welding substrate 3 is placed on the heating platform 2, and the heating platform 2 heats the welding substrate 3 as a whole through heat conduction; The heating platform 2 is provided with a plurality of mounting holes arranged in a rectangular array.

[0038] Hot air regulating hose 11: mainly transmits the heat of hot air circulation to melt the molten solder between the workpiece and the connector 4 for welding. The pipeline adopts a stainless steel hose, and the position can be adjusted by manual operation. Two pipelines are reserved, and up to three connectors 4 can be welded in the same welding base 3. If necessary, it can be further increased.

[0039] like Figure 4 As shown, this is Example 2 of the technical solution: The main difference between it and embodiment 1 is that the heating elements are symmetrically distributed in the heating platform 2 .

[0040] Specifically, in one embodiment, the groove in the heating platform 2 for mounting the heating element is formed by connecting a plurality of transverse rectangular grooves and longitudinal rectangular grooves.

[0041] Embodiment 3 of the present technical solution: The temperature control system includes a PID temperature controller, a temperature measuring thermocouple group, and a temperature recorder.

[0042] Further improvement, the temperature measuring thermocouple group includes a heating platform thermocouple 6, a hot air circulation system thermocouple 7, a workpiece thermocouple 8, and a connector surface thermocouple 9. The heating platform thermocouple 6 is used to measure the temperature of the surface of the heating platform 2; the hot air circulation system thermocouple 7 is used to measure the temperature inside the vacuum chamber 1; the workpiece thermocouple 8 is used to measure the temperature inside the welding substrate 3; and the connector surface thermocouple 9 is used to measure the temperature of the connector 4 surface.

[0043] PID temperature controller: The temperature controller is a modular, freely configurable, high-precision, high-performance temperature and process controller. The PID temperature controller is used to achieve multi-stage closed-loop temperature control. Temperature recorder: used to receive the signal sent by the temperature control instrument, record all temperatures of the connector 4 during the welding process in real time, and form a corresponding curve for easy viewing after welding.

[0044] It is a routine operation for those skilled in the art to realize temperature monitoring and control of the heating platform 2 and the hot air circulation system 10 by cooperating with the PID temperature controller, the temperature measuring thermocouple group and the temperature recorder in combination with the existing control system.

[0045] For example, STC12C5A60S2 is used as the single-chip microcomputer control chip, a DC 24 V voltage is used for power supply, a MOS tube power drive circuit is designed, the temperature of the heating platform 2 is obtained by using the heating platform thermocouple 6, the heating mode and temperature can be set, and the PID algorithm is used to adjust the heating curve to form a closed-loop control, so as to achieve the purpose of uniformly heating the welding substrate 3 by the heating platform 2 through heat conduction.

[0046] Embodiment 4 of the present technical solution: The vacuum chamber 1 adopts an inner and outer layer structure, the inner layer is welded from SUS304 stainless steel material, and the outer layer is welded from Q235A cold-rolled steel plate material.

[0047] Embodiment 5 of the present technical solution: the inner and outer structures of the vacuum chamber 1 are filled with aerogel insulation cotton material.

[0048] Aerogel insulation wool material can keep warm and prevent fire.

[0049] Embodiment 6 of the present technical solution: The vacuum chamber 1 is designed with a front observation window door.

[0050] Such a solution not only facilitates the insertion of the welding substrate 3, but also enables the operator to observe the welding process of the connector 4 through the observation window at any time during the welding process.

[0051] like Figure 5 As shown, the present invention provides a temperature control method for a vacuum soldering system for rapid connector welding, comprising the following steps: Step 1: Turn on the power supply and gas supply, and check before powering on the equipment; Step 2: Control the vacuum pump of the vacuum system 5 to start, and evacuate the vacuum chamber 1; Step 3: When the vacuum degree reaches 0.01Mpa, turn off the vacuum pump and open the inert gas inlet valve; Step 4: When the vacuum degree reaches 0.1Mpa, close the inert gas inlet valve, control the heating element inside the heating platform 2 to work, and turn on the hot air circulation system 10 after the temperature of the heating platform 2 reaches the target temperature; Step 5: After the hot air circulation system 10 reaches the set temperature, input the welding time into the control system Step 6: After the welding time is reached, the hot air circulation system 10 is turned off to stop heating; Step 7: When the surface temperature of the workpiece reaches 50°C, open the door of vacuum chamber 1, which is also the front observation window door, and take out the welded workpiece.

[0052] The temperature control method of this technical solution is explained in detail with a specific example below: On the control system operating software, set ① the target temperature of heating platform 2 to 420℃, ② the set temperature of hot air circulation system 10 to 380℃, ③ the target temperature inside the welding workpiece to 280℃, ④ the target temperature of the surface of connector 4 to 280℃, and the stable deviation to ±1℃, ⑤ the vacuum degree of vacuum chamber 1 to 0.01Mpa, ⑥ the solder heating time to 5 minutes, and ⑦ the cooling temperature value inside the workpiece to 100℃; operate the equipment in manual mode, close the front observation window, and manually start the vacuum pump group on the control system software. The vacuum pump group evacuates the vacuum chamber 1. When the vacuum degree reaches the system set value of 0.01Mpa, the vacuum pump group automatically stops the evacuation action; further, manually start the heating platform 2 and the hot air circulation system 10 devices on the control system software at the same time, and wait for the heating platform 2 When the temperature reaches the set temperature of 420℃, the heating platform 2 stops heating. When the hot air circulation temperature reaches the set temperature of 380℃, the hot air circulation system 10 stops heating. At this time, it is necessary to wait for the internal temperature of the workpiece to reach 280℃ and the surface temperature of the connector 4 to reach 280℃; manually open the hot air circulation valve, and transport the 380℃ hot air of the hot air circulation system 10 to the surface of the connector 4 through the stainless steel pipeline, so that the solder between the connector 4 and the substrate melts evenly. After the solder heating time reaches 5 minutes on the control software, the hot air circulation valve automatically closes; further, when the internal cooling temperature of the workpiece reaches 100℃, the backfill valve on the equipment automatically opens to fill the vacuum chamber 1 with air. When the vacuum degree in the vacuum chamber 1 reaches atmospheric pressure, the backfill valve automatically stops working. Further, manually open the front observation window door and take out the soldered connector 4.

[0053] The control system has manual operation and automatic operation system programs. The automatic control system program is mainly executed according to the welding recipe. Click the automatic button on the control system operation panel, and the control system will automatically weld according to the set welding recipe.

[0054] All the hardware involved in this technical solution are customized products.

[0055] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" (this part of the text needs to be adjusted and replaced according to the text used in each case), etc., which indicate the orientation or position relationship. The terms are based on the orientation or position relationship shown in the drawings of this specification, which are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0056] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A vacuum soldering system for rapid connector welding, comprising a vacuum chamber (1) and a vacuum system (5) for evacuating the vacuum chamber (1), characterized in that: The invention also comprises a hot air circulation system (10), an inert gas fast charging system (12), and a heating platform (2) arranged in the vacuum chamber (1), wherein a heating element is installed inside the heating platform (2), and the heating platform (2) is used to accommodate the welding substrate (3) and heat the welding substrate (3) by heat conduction; the hot air circulation system (10) comprises a high temperature resistant blower and a heat source, and the heat source is used to heat the air in the vacuum chamber (1); the high temperature resistant blower circulates the air in the vacuum chamber (1) through a hot air regulating hose (11), melts the molten solder between the welding substrate (3) and the connector (4) by transmitting the heat of the hot air circulation, and heats the solder inside the connector (4) and the welding substrate (3) by heat convection; the temperature of the heating platform (2) and the hot air circulation system (10) is controlled by a temperature control system.

2. A vacuum soldering system for rapid connector welding according to claim 1, characterized in that: The heating platform (2) is formed by covering an upper platform (21) and a lower platform (22), and surfaces of the upper platform (21) and the lower platform (22) in contact with each other are both provided with a receiving groove for receiving a welding substrate (3).

3. A vacuum soldering system for rapid connector welding according to claim 1, characterized in that: The heating elements are symmetrically distributed within the heating platform (2).

4. A vacuum soldering system for rapid connector welding according to any one of claims 1 to 3, characterized in that: The temperature control system comprises a PID temperature controller, a temperature measuring thermocouple group and a temperature recorder.

5. A vacuum soldering system for rapid connector welding according to claim 4, characterized in that: The temperature measuring thermocouple group comprises a heating platform thermocouple (6), a hot air circulation system thermocouple (7), a workpiece thermocouple (8), and a connector surface thermocouple (9). The heating platform thermocouple (6) is used to measure the temperature of the surface of the heating platform (2); the hot air circulation system thermocouple (7) is used to measure the temperature inside the vacuum chamber (1); the workpiece thermocouple (8) is used to measure the temperature inside the welding substrate (3); and the connector surface thermocouple (9) is used to measure the temperature of the surface of the connector (4).

6. A vacuum soldering system for rapid connector welding according to any one of claims 1 to 3, characterized in that: The vacuum chamber (1) adopts an inner and outer layer structure, wherein the inner layer is welded from SUS304 stainless steel material, and the outer layer is welded from Q235A cold-rolled steel plate material.

7. A vacuum soldering system for rapid connector welding according to claim 6, characterized in that: Aerogel heat-insulating cotton material is filled between the inner and outer structures of the vacuum chamber (1).

8. A vacuum soldering system for rapid connector welding according to claim 6, characterized in that: The vacuum chamber (1) is designed with a front observation window door.

9. A temperature control method for a vacuum soldering system for rapid connector welding using claim 1, characterized in that: The steps include: Step 1: Turn on the power supply and gas supply, and check before powering on the equipment; Step 2: Control the vacuum pump of the vacuum system (5) to start, and evacuate the vacuum chamber (1); Step 3: When the vacuum degree reaches 0.01Mpa, turn off the vacuum pump and open the inert gas inlet valve; Step 4: When the vacuum degree reaches 0.1Mpa, close the inert gas inlet valve, control the heating element inside the heating platform (2) to work, and after the temperature of the heating platform (2) reaches the target temperature, turn on the hot air circulation system (10); Step 5: After the hot air circulation system (10) reaches the set temperature, the welding time is input into the control system; Step 6: When the welding time is reached, the hot air circulation system (10) is turned off to stop heating; Step 7: When the workpiece surface temperature reaches 50°C, open the front observation window of the vacuum chamber (1) and take out the welded workpiece.

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