A compact vacuum brazing apparatus and a vacuum brazing production method

Abstract

The application discloses a compact vacuum brazing device and a vacuum brazing production method based on the compact vacuum brazing device. The compact vacuum brazing device comprises a vacuum brazing chamber, an air cooling chamber, a loading and unloading workbench, a trolley and a conveying trolley. The conveying trolley moves back and forth along a conveying trolley track between the vacuum brazing chamber, the air cooling chamber and the loading and unloading workbench. The air cooling chamber and the loading and unloading workbench are arranged on one side of the conveying trolley track, and the vacuum brazing chamber is arranged on the other side of the conveying trolley track. Two trolley positions are arranged on the conveying trolley, and two trolleys can be loaded simultaneously. The conveying trolley moves back and forth along the conveying trolley track between the vacuum brazing chamber, the air cooling chamber and the loading and unloading workbench, so that the conveying trolley is connected with the vacuum brazing chamber, the air cooling chamber and the loading and unloading workbench respectively, and the trolley is conveyed back and forth between different vacuum brazing production execution units, such as the conveying trolley, the loading and unloading workbench, the vacuum brazing chamber and the air cooling chamber.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vacuum furnace, in particular relates to a compact vacuum brazing equipment and a vacuum brazing production method based on the compact vacuum brazing equipment. BACKGROUND

[0002] Aluminum alloy vacuum brazing has very strong adaptability in practical application, and is widely used in aviation, aerospace, petrochemical, electronic, air separation, low temperature, vehicle, ship and other industrial departments. Among them, heat exchanger is an important application aspect of aluminum alloy vacuum brazing, and specific products mainly include evaporator and condenser of automobile air conditioner, automobile radiator, oil cooler, plate-fin heat exchanger in air separation equipment, etc.

[0003] The implementation of aluminum alloy vacuum brazing technology requires high equipment, and the vacuum brazing equipment is required to have excellent heating performance and vacuum degree performance. At present, the vacuum brazing equipment used in the industry mainly includes single-chamber vacuum brazing furnace and multi-chamber continuous vacuum brazing furnace. Single-chamber vacuum brazing furnace is mainly suitable for small batch vacuum brazing work, and multi-chamber continuous vacuum brazing furnace is suitable for large batch vacuum brazing work. However, for medium-scale vacuum brazing production, neither of the two devices is suitable. Single-chamber vacuum brazing furnace has the disadvantages of poor process continuity and low automation level, while multi-chamber continuous vacuum brazing furnace has the problems of poor production capacity utilization rate, large floor area and high equipment price, which cannot meet the needs of medium-scale vacuum brazing production. SUMMARY

[0004] The present application provides a kind of compact vacuum brazing equipment and vacuum brazing production method based on the compact vacuum brazing equipment.The compact vacuum brazing equipment includes 1 vacuum brazing chamber, 1 air cooling chamber, 1 loading and unloading workbench, 2 above material cars and 1 transfer trolley;Material car is used to load the workpiece needing vacuum brazing;Transfer trolley is provided with transfer trolley driving device, the bottom of transfer trolley is provided with wheel, transfer trolley moves back and forth between vacuum brazing chamber, air cooling chamber and loading and unloading workbench under the driving of transfer trolley driving device, air cooling chamber and loading and unloading workbench are arranged on one side of transfer trolley track, vacuum brazing chamber is arranged on the other side of transfer trolley track;Transfer trolley is arranged with two material car positions, can load two material cars simultaneously, each material car position is provided with a set of transfer trolley material car guide rail and transfer trolley material car conveying device, material car can move back and forth along transfer trolley material car guide rail under the driving of transfer trolley material car conveying device;Vacuum brazing chamber includes vacuum system, vacuum furnace body, brazing chamber material car conveying device, brazing chamber material car guide rail, heat shield, heater, vacuum system is connected with vacuum furnace body to form vacuum sealed body, brazing chamber material car guide rail, heat shield and heater are arranged inside vacuum furnace body;Heater is arranged inside heat shield, brazing chamber material car guide rail is arranged on the upper part of heat shield;Heat shield includes multiple layers of metal sheets;Material car can move back and forth along brazing chamber material car guide rail under the driving of brazing chamber material car conveying device;Air cooling chamber is provided with air cooling chamber material car conveying device, air cooling chamber material car guide rail and 2 above fans, fans are arranged on both sides of air cooling chamber, material car can move back and forth along air cooling chamber material car guide rail under the driving of air cooling chamber material car conveying device;When transfer trolley moves between vacuum brazing chamber and air cooling chamber, the transfer trolley material car guide rail on one of the two material car positions on transfer trolley is aligned with brazing chamber material car guide rail, at the same time, the transfer trolley material car guide rail on the other material car position is aligned with air cooling chamber material car guide rail, the two material car positions on transfer trolley are respectively connected with vacuum brazing chamber and air cooling chamber at the same time, at this time, one material car can be conveyed back and forth between transfer trolley and vacuum brazing chamber, the other material car can be conveyed back and forth between transfer trolley and air cooling chamber;Loading and unloading workbench includes workbench material car guide rail and workbench material car conveying device, material car can move back and forth along workbench material car guide rail under the driving of workbench material car conveying device;When transfer trolley moves to the opposite side of loading and unloading workbench, the transfer trolley material car guide rail on one of the material car positions on transfer trolley is aligned with workbench material car guide rail, the material car position is connected with loading and unloading workbench, after connection, the material car on the material car position can be conveyed back and forth between transfer trolley and loading and unloading workbench.

[0005] Volatilization catcher is arranged in vacuum brazing chamber, volatilization catcher is arranged at both ends of heat shield;The number of volatilization catcher is 2 above, and cooling medium is passed in the inside.

[0006] The volatile matter trapping device is arranged on the inner side wall of the vacuum brazing chamber at both ends of the heat insulation sheet, and the inner side wall where the volatile matter trapping device is arranged is recessed compared to the arrangement position of the heater and the heat insulation screen on the side, so that the surface of the volatile matter trapping device is further away from the heater surface on the side compared to the workpiece carrying trolley. The installation position of the volatile matter trapping device in the application makes the volatile matter trapping surface further away from the workpiece on the trolley compared to the heater surface on the side, so that the lower temperature of the volatile matter trapping device surface can avoid affecting the heating effect of the workpiece, and the volatile matter trapping effect is improved. In an embodiment of the application, the volatile matter trapping device comprises two cylindrical coolers with cooling medium inside; during the operation of the volatile matter trapping device, the two cylindrical coolers rotate synchronously.

[0007] The heaters in the vacuum brazing chamber are arranged on both sides of the vacuum brazing chamber, and each side of the heater is divided into more than 4 groups; each group of heaters has a separate heating power supply, and a separate thermocouple temperature control device is arranged, and the maximum temperature in the heat insulation screen is above 600℃. In a more preferred embodiment, each side of the heater is divided into more than 9 groups. The compact vacuum brazing equipment also comprises a plurality of heating power supplies for supplying power to the plurality of heaters for heating, and the voltage of the heating power supply is lower than 110V.

[0008] The conveying trolley track is laid on the ground, and the conveying trolley guide rail is perpendicular to the conveying trolley track; the conveying trolley guide rail, the brazing chamber guide rail, the air cooling chamber guide rail and the workbench guide rail are respectively located on the upper part of the conveying trolley, the vacuum furnace body, the air cooling chamber and the loading and unloading workbench.

[0009] The vacuum system of the vacuum brazing chamber comprises an oil diffusion vacuum pump, a Roots vacuum pump, a mechanical vacuum pump and a vacuum valve. The vacuum furnace body is a rectangular box structure, and one side of the vacuum furnace body is provided with an inlet and outlet door.

[0010] The compact vacuum brazing equipment is used for vacuum brazing of aluminum or aluminum alloy structural parts, and the maximum working temperature is in the range of 300-700℃.

[0011] The compact vacuum brazing equipment also comprises a water chiller or a water cooling system for cooling the diffusion vacuum pump, the cold trap and the volatile matter trap.

[0012] In one embodiment of the present application, an oil removal system is also provided downstream of the vacuum system of the vacuum brazing chamber. The oil removal system comprises a condenser connected to the exhaust end of the vacuum system and an oil mist filter provided downstream of the condenser. The oil mist filter is of a cyclone separation type and has a rotating drum with a grid inside, which rotates at a certain speed when the oil mist filter is in operation. Both the condenser and the oil mist filter are provided with an oil drain line leading to an oil collection container. The gas extracted from the vacuum brazing chamber can be directly discharged into the workshop chamber after being filtered by the oil removal system. The grid of the rotating drum has 2-4 layers, which have a special-shaped structure. The 2-4 layers of the special-shaped grid are combined to form a labyrinth path in the direction from the inside to the outside of the rotating drum. A filter pad made of a synthetic filter material is provided inside the rotating drum. The labyrinth path blocks the oil mist from leaking to the outside of the rotating drum and also functions as a flow straightener for the discharged clean gas. The blocked oil mist is gathered into large droplets and drained along the grid to the oil drain line of the oil mist filter.

[0013] When the special-shaped workpiece requiring vacuum brazing is formed, some oil will remain on the surface of the workpiece. In order to ensure the quality of vacuum brazing, the oil on the surface of the workpiece must be removed before welding. In the present application, the vacuum brazing equipment with the above-mentioned oil removal system can directly enter the vacuum brazing equipment without cleaning agent cleaning before entering the vacuum brazing equipment when performing vacuum brazing production. The workpiece is preheated and vacuumed at the same time. The gas containing oil mist extracted from the vacuum brazing chamber is filtered by the oil removal system to achieve a high environmental protection index and can be directly discharged into the workshop chamber. After verification by the weighing method, the oil removal rate of the workpiece using the vacuum oil removal technology of the equipment reaches 100%, the vacuum welding quality is excellent, and the good product rate reaches more than 95%. At the same time, the gas containing oil mist extracted from the vacuum brazing chamber is treated layer by layer and finally meets the Shanghai landmark emission standard requirements of DB31 / 933-2015, achieving the effect of being able to be discharged into the chamber.

[0014] The cooling water of the vacuum furnace body of the vacuum brazing chamber of the compact vacuum brazing equipment is provided by a separate furnace body hot water cooling system, the cooling water temperature of the vacuum furnace body is set to 60-95℃, and the temperature of the inner wall of the vacuum furnace body is kept above 60℃. In general vacuum equipment, the cooling water temperature of the vacuum chamber is generally set to 10-20℃, and the chamber wall is kept at a low temperature level. Since the in-out material door of the vacuum brazing chamber of the compact vacuum brazing equipment needs to be opened frequently, and the vacuum brazing chamber needs to reach the specified vacuum degree as soon as possible after feeding for vacuum brazing, the applicant found that when the in-out material door is opened, if the temperature of the inner wall of the vacuum furnace body is low, the water vapor in the external environment is easy to adhere to the inner wall of the vacuum furnace body, which seriously affects the vacuum speed and effect, and also affects the quality of the vacuum brazing of aluminum or aluminum alloy. Therefore, the cooling water of the vacuum furnace body is provided by a separate furnace body hot water cooling system, the cooling water temperature of the vacuum furnace body is set to 60-95℃, and the temperature of the inner wall of the vacuum furnace body is kept above 60℃, so that the inner wall of the vacuum furnace body realizes the effect of "hot wall", preventing the water vapor in the external environment from adhering to the inner wall of the vacuum furnace body when the in-out material door is opened, effectively improving the vacuum speed and effect of the vacuum brazing chamber, and improving the welding quality of the vacuum brazing. In addition, when the compact vacuum brazing equipment of the present application has an oil removal system, the "hot wall" effect of the inner wall of the vacuum furnace body can also prevent oil mist from adhering to the inner wall of the furnace body during the oil removal process, so that all the oil mist is removed into the oil removal system, effectively improving the oil removal effect and preventing the oil droplets adhering to the inner wall of the furnace body from affecting the quality of the vacuum brazing.

[0015] The present application also provides a vacuum brazing production method based on the above-mentioned compact vacuum brazing equipment. The production method adopts the compact vacuum brazing equipment and mainly includes the following steps: (1) placing workpieces to be vacuum brazed on the loading and unloading workbench on the trolley, driving the conveying trolley to move to make the No. 1 trolley position butt joint with the loading and unloading workbench, and conveying the trolley carrying the workpieces to be vacuum brazed from the loading and unloading workbench to the No. 1 trolley position of the conveying trolley; (2) driving the conveying trolley to move to the opposite side of the vacuum brazing chamber to make the No. 2 trolley position butt joint with the vacuum brazing chamber, and then conveying the trolley carrying the workpieces that have completed vacuum brazing in the vacuum brazing chamber to the No. 2 trolley position of the conveying trolley; (3) driving the conveying trolley to make the No. 1 trolley position butt joint with the vacuum brazing chamber and make the No. 2 trolley position butt joint with the air cooling chamber; (4) conveying the trolley carrying the workpieces to be vacuum brazed on the No. 1 trolley position into the vacuum brazing chamber, and then starting the vacuum pumping program and the heating brazing program; (5) conveying the trolley carrying the workpieces that have completed vacuum brazing on the No. 2 trolley position into the air cooling chamber, and then starting the air cooling program; (6) after the air cooling program is completed, conveying the trolley carrying the workpieces that have completed air cooling in the air cooling chamber to the No. 2 trolley position of the conveying trolley; (7) driving the conveying trolley to make the No. 1 trolley position butt joint with the loading and unloading workbench, and conveying the new trolley carrying the workpieces to be vacuum brazed on the loading and unloading workbench to the No. 1 trolley position of the conveying trolley; (8) driving the conveying trolley again to make the No. 2 trolley position butt joint with the loading and unloading workbench, conveying the trolley carrying the workpieces that have completed air cooling on the No. 2 trolley position to the loading and unloading workbench, unloading the workpieces that have completed vacuum brazing and cooling on the trolley, and loading the next batch of workpieces to be vacuum brazed on the trolley.

[0016] The operation steps of the cycle (1)-(8) realize continuous vacuum brazing production by using the compact vacuum brazing equipment.

[0017] When the trolley carrying the workpieces to be vacuum brazed is conveyed from the loading and unloading workbench to the No. 1 trolley position of the conveying trolley, the workbench trolley conveying device and the conveying trolley trolley conveying device need to be started at the same time to convey the trolley to the No. 1 trolley position of the conveying trolley. The trolley stops automatically after reaching the specified position and is locked at the specified position.

[0018] When the trolley carrying the workpieces to be vacuum brazed on the No. 1 trolley position of the conveying trolley is conveyed into the vacuum brazing chamber, the access door of the vacuum brazing chamber needs to be opened before the trolley enters the vacuum brazing chamber, and then the conveying trolley trolley conveying device and the brazing chamber trolley conveying device are started to convey the trolley into the vacuum brazing chamber. The access door of the vacuum brazing chamber is closed after the trolley reaches the specified position, and then the vacuum pumping program is started. After the vacuum brazing chamber reaches the specified vacuum degree, the heating brazing program is started to make the vacuum brazing chamber reach the specified temperature. The specified vacuum degree is higher than 5×10 -1Pa, the specified temperature is in the range of 300-700℃.

[0019] The vacuum brazing production method based on the compact vacuum brazing equipment of the present application, by moving the conveying trolley along the conveying trolley track between the vacuum brazing chamber, the air cooling chamber and the loading and unloading workbench, makes the conveying trolley respectively and flexibly dock with the vacuum brazing chamber, the air cooling chamber and the loading and unloading workbench, and cooperates with the precise action design, so that the trolley is conveyed back and forth between the conveying trolley, the loading and unloading workbench, the vacuum brazing chamber, the air cooling chamber and other different vacuum brazing production execution units, with high action efficiency, realizing the flexible continuous vacuum brazing automation production. This flexible continuous vacuum brazing automation production method not only facilitates flexible arrangement of process, but also saves a large amount of equipment investment and equipment space occupation, and is very suitable for medium-scale vacuum brazing production. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a top view schematic diagram of an embodiment of the compact vacuum brazing equipment of the present application.

[0021] Figure 2 is a front view schematic diagram of an embodiment of the conveying trolley carrying the trolley in the present application.

[0022] The accompanying drawings are not drawn to scale, and are intended to show the basic principles and basic structures of the present application. The structural features and components in the drawings are represented in a simplified manner. The specific design features of the technical solutions of the present application (including but not limited to specific sizes, directions, positions and shapes) will be partly determined and adjusted by the specific application and use environment. In addition, the embodiments covered by the technical solutions of the present application are not limited to the embodiments and examples shown in the accompanying drawings. DETAILED DESCRIPTION

[0023] The embodiments of the present application will be further described below in conjunction with the accompanying drawings.

[0024] As Figure 1 and Figure 2As shown, the compact vacuum brazing equipment comprises a vacuum brazing chamber 1, an air cooling chamber 2, a loading and unloading workbench 3, a trolley 4 and a trolley 5, and a conveying trolley 6, and the trolley is used to load the workpiece which needs to be vacuum brazed. The conveying trolley 6 is provided with a conveying trolley driving device 7, the bottom of the conveying trolley is provided with wheels 8, and the conveying trolley 6 moves back and forth between the vacuum brazing chamber 1, the air cooling chamber 2 and the loading and unloading workbench 3 under the driving of the conveying trolley driving device 7, the air cooling chamber 2 and the loading and unloading workbench 3 are arranged on one side of the conveying trolley track 9, and the vacuum brazing chamber 1 is arranged on the other side of the conveying trolley track 9; the conveying trolley 6 is arranged with a No. 1 trolley position 10 and a No. 2 trolley position 11, and two trolleys can be loaded at the same time, and each trolley position is provided with a set of conveying trolley trolley guide rails 12 and conveying trolley trolley conveying devices 13, and the trolley can move back and forth along the conveying trolley trolley guide rails 12 under the driving of the conveying trolley trolley conveying devices 13; the vacuum brazing chamber 1 comprises a vacuum system 14, a vacuum furnace body 15, a brazing chamber trolley conveying device 21, a brazing chamber trolley guide rail 22, a heat shield 16 and a heater 17, the vacuum system 14 is connected with the vacuum furnace body 15 to form a vacuum sealed body, the brazing chamber trolley guide rail, the heat shield 16 and the heater 17 are arranged inside the vacuum furnace body 15; the heater is arranged inside the heat shield, and the brazing chamber trolley guide rail is arranged on the upper part of the heat shield; the heat shield comprises multiple layers of metal sheets; the trolley can move back and forth along the brazing chamber trolley guide rail 22 under the driving of the brazing chamber trolley conveying device 21; the air cooling chamber 2 is provided with an air cooling chamber trolley conveying device 23, an air cooling chamber trolley guide rail 24 and more than two air fans 18, the air fans 18 are arranged on both sides of the air cooling chamber, and the trolley can move back and forth along the air cooling chamber trolley guide rail 24 under the driving of the air cooling chamber trolley conveying device 23; when the conveying trolley moves between the vacuum brazing chamber 1 and the air cooling chamber 2, the conveying trolley trolley guide rail on one of the two trolley positions on the conveying trolley is aligned with the brazing chamber trolley guide rail, at the same time, the conveying trolley trolley guide rail on the other trolley position is aligned with the air cooling chamber trolley guide rail, and the trolley position 10 and the trolley position 11 on the conveying trolley are respectively connected with the vacuum brazing chamber 1 and the air cooling chamber 2 at the same time, at this time, the trolley 4 can be conveyed back and forth between the conveying trolley 6 and the vacuum brazing chamber 1, and the other trolley 5 can be conveyed back and forth between the conveying trolley 6 and the air cooling chamber 2; the loading and unloading workbench 3 comprises a workbench trolley guide rail 25 and a workbench trolley conveying device 26, and the trolley can move back and forth along the workbench trolley guide rail 25 under the driving of the workbench trolley conveying device 26; when the conveying trolley 6 moves to the opposite side of the loading and unloading workbench 3, the conveying trolley trolley guide rail on one of the trolley positions on the conveying trolley is aligned with the workbench trolley guide rail, and the trolley position is connected with the loading and unloading workbench, after the connection, the trolley on the trolley position can be conveyed back and forth between the conveying trolley and the loading and unloading workbench.

[0025] The volatile matter trap 19 is arranged in the vacuum brazing chamber 1 and is arranged at both ends of the heat shield; the number of the volatile matter traps is more than 2, and the volatile matter traps are internally provided with cooling medium.

[0026] The volatile matter trap is arranged on the inner side wall of the vacuum brazing chamber at both ends of the heat shield, and the inner side wall where the volatile matter trap is arranged is recessed compared with the arrangement position of the heater and the heat shield on the side, so that the surface of the volatile matter trap is more distant from the heater surface on the side compared with the workpiece-carrying trolley. The installation position of the volatile matter trap in the present application makes the surface of the volatile matter trap more distant from the workpiece on the trolley compared with the heater surface on the side, so that the lower temperature of the surface of the volatile matter trap can avoid affecting the heating effect of the workpiece, and the volatile matter trapping effect is improved. In an embodiment of the present application, the volatile matter trap comprises two cylindrical cooling bodies, and the cylindrical cooling bodies are internally provided with cooling medium; when the volatile matter trap works, the two cylindrical cooling bodies rotate synchronously.

[0027] The heater 17 in the vacuum brazing chamber is arranged on both sides in the vacuum brazing chamber, and the heater on each side is divided into more than 4 groups; each group of the heater has a separate heating power supply, and is provided with a separate thermocouple temperature control device, and the highest temperature in the heat shield is more than 600℃. In a more preferred embodiment, the heater on each side is divided into more than 9 groups. The compact vacuum brazing equipment further comprises a plurality of heating power supplies for supplying power to the plurality of heaters for heating, and the voltage of the heating power supply is lower than 110V.

[0028] The conveying trolley track 9 is laid on the ground, and the conveying trolley trolley guide rail is perpendicular to the conveying trolley track; the conveying trolley trolley guide rail, the brazing chamber trolley guide rail, the air cooling chamber trolley guide rail and the workbench trolley guide rail are respectively located on the upper part of the conveying trolley, the vacuum furnace body, the air cooling chamber and the loading and unloading workbench.

[0029] The vacuum system 14 of the vacuum brazing chamber comprises an oil diffusion vacuum pump, a Roots vacuum pump, a mechanical vacuum pump and a vacuum valve. The vacuum furnace body 15 is a rectangular box structure, and one side of the vacuum furnace body 15 is provided with an inlet and outlet door 20.

[0030] The compact vacuum brazing equipment is used for vacuum brazing of aluminum or aluminum alloy structural parts, and the highest working temperature is in the range of 300-700℃.

[0031] The compact vacuum brazing equipment further comprises a water chiller or a water cooling system for cooling the diffusion vacuum pump, the cold trap and the volatile matter trap.

[0032] In one embodiment of the present application, an oil removal system is further provided downstream of the vacuum system of the vacuum brazing chamber. The oil removal system comprises a condenser connected to the exhaust end of the vacuum system and an oil mist filter provided downstream of the condenser. The oil mist filter has a cyclone separation structure and is internally provided with a rotating drum having a grid. The rotating drum rotates at a certain speed when the oil mist filter is in operation. Both the condenser and the oil mist filter are provided with an oil drain line leading to an oil collection container. The gas extracted from the vacuum brazing chamber can be directly discharged into the workshop chamber after being filtered by the oil removal system. The grid of the rotating drum has 2-4 layers, and the grid has a special-shaped structure. The 2-4 layers of the grid with special-shaped structure are combined to form a labyrinth path in the direction from the inside to the outside of the rotating drum. A filter pad made of synthetic filter material is provided on the inside of the rotating drum. The labyrinth path plays a role of blocking the oil mist from leaking to the outside of the rotating drum and rectifying the discharged clean gas. After being blocked, the oil mist is gathered into large droplets and discharged to the oil drain line of the oil mist filter.

[0033] The present application also provides a vacuum brazing production method based on the above-mentioned compact vacuum brazing equipment. The production method uses the above-mentioned compact vacuum brazing equipment and mainly comprises the following steps: (1) placing the workpieces to be vacuum brazed on the trolley on the loading and unloading workbench, driving the transfer trolley to move so that the No. 1 trolley position is docked with the loading and unloading workbench, and then transferring the trolley carrying the workpieces to be vacuum brazed from the loading and unloading workbench to the No. 1 trolley position of the transfer trolley; (2) driving the transfer trolley to move to the opposite side of the vacuum brazing chamber so that the No. 2 trolley position is docked with the vacuum brazing chamber, and then transferring the trolley carrying the workpieces that have completed vacuum brazing in the vacuum brazing chamber to the No. 2 trolley position of the transfer trolley; (3) driving the transfer trolley so that the No. 1 trolley position is docked with the vacuum brazing chamber and the No. 2 trolley position is docked with the air cooling chamber; (4) transferring the trolley carrying the workpieces to be vacuum brazed on the No. 1 trolley position into the vacuum brazing chamber, and then starting the vacuum pumping program and the heating brazing program; (5) transferring the trolley carrying the workpieces that have completed vacuum brazing on the No. 2 trolley position into the air cooling chamber, and then starting the air cooling program; (6) after the air cooling program is completed, transferring the trolley carrying the workpieces that have completed air cooling in the air cooling chamber to the No. 2 trolley position of the transfer trolley; (7) driving the transfer trolley so that the No. 1 trolley position is docked with the loading and unloading workbench, and then transferring the new trolley carrying the workpieces to be vacuum brazed on the loading and unloading workbench to the No. 1 trolley position of the transfer trolley; (8) driving the transfer trolley again so that the No. 2 trolley position is docked with the loading and unloading workbench, transferring the trolley carrying the workpieces that have completed air cooling on the No. 2 trolley position to the loading and unloading workbench, unloading the workpieces that have completed vacuum brazing and cooling from the trolley, and then loading the next batch of workpieces to be vacuum brazed on the trolley.

[0034] The operation steps of cycle (1)-(8) realize continuous vacuum brazing production by using the compact vacuum brazing equipment.

[0035] Figure 1 The transfer trolley 6 shown in the figure is between the vacuum brazing chamber 1 and the air cooling chamber 2, the No. 1 trolley position 10 is in butt joint with the vacuum brazing chamber 1, and the No. 2 trolley position 11 is in butt joint with the air cooling chamber 2, the trolley 4 on the No. 1 trolley position is being transferred into the vacuum brazing chamber 1 under the drive of the transfer trolley trolley transfer device 13 and the brazing chamber trolley transfer device 21, and the trolley 5 on the No. 2 trolley position is being transferred into the air cooling chamber 2 under the drive of the transfer trolley trolley transfer device and the air cooling chamber trolley transfer device 23. Figure 1 The state of the transfer trolley 6 shown by the dotted line in the figure is that the transfer trolley is moved to butt joint the No. 2 trolley position 11 with the loading and unloading workbench 3, and the trolley with the air cooled workpiece is being transferred from the No. 2 trolley position into the loading and unloading workbench 3.

[0036] When the trolley with the workpiece needing vacuum brazing is transferred from the loading and unloading workbench 3 to the No. 1 trolley position 10 of the transfer trolley 6, the workbench trolley transfer device 26 and the transfer trolley trolley transfer device 13 need to be opened at the same time to transfer the trolley to the No. 1 trolley position 10 of the transfer trolley, and the trolley stops automatically after reaching the designated position and is locked at the designated position.

[0037] When the trolley with the workpiece needing vacuum brazing on the No. 1 trolley position 10 of the transfer trolley is transferred into the vacuum brazing chamber 1, the access door 20 of the vacuum brazing chamber needs to be opened before the trolley enters the vacuum brazing chamber, then the transfer trolley trolley transfer device 13 and the brazing chamber trolley transfer device 21 are opened to transfer the trolley into the vacuum brazing chamber 1, the access door 20 of the vacuum brazing chamber is closed when the trolley reaches the designated position, and then the vacuumizing program is started, the vacuum brazing chamber reaches the designated vacuum degree, and then the heating brazing program is started to make the vacuum brazing chamber reach the designated temperature, the designated vacuum degree is higher than 5×10 -1 Pa, and the designated temperature is in the range of 300-700℃.

[0038] The cooling water of the vacuum furnace body of the vacuum brazing chamber of the compact vacuum brazing equipment is provided by a separate furnace body hot water cooling system, the cooling water temperature of the vacuum furnace body is set to 60-95℃, the temperature of the inner wall of the vacuum furnace body is kept above 60℃, the inner wall of the vacuum furnace body realizes "hot wall" effect, prevents the water vapor in the external environment from adhering to the inner wall of the vacuum furnace body when the access door is opened, effectively improves the vacuumizing speed and effect of the vacuum brazing chamber, and improves the welding quality of the vacuum brazing. In addition, when the compact vacuum brazing equipment of the present application is provided with an oil removal system, the "hot wall" effect of the inner wall of the vacuum furnace body can also prevent the oil mist in the oil removal process from adhering to the inner wall of the furnace body, so that all the oil mist is removed into the oil removal system, effectively improving the oil removal effect and preventing the oil droplets adhering to the inner wall of the furnace body from affecting the quality of the vacuum brazing.

Claims

1. A compact vacuum brazing device, characterized in that: This compact vacuum brazing equipment includes one vacuum brazing chamber, one air-cooling chamber, one loading and unloading workbench, two or more material carts, and one conveyor trolley. The material carts are used to load workpieces requiring vacuum brazing. The conveyor trolley is equipped with a drive unit and wheels at its bottom. Driven by the drive unit, the conveyor trolley moves back and forth along a track between the vacuum brazing chamber, the air-cooling chamber, and the loading and unloading workbench. The air-cooling chamber and the loading and unloading workbench are located on one side of the conveyor trolley track, and the vacuum brazing chamber is located on the other side. The conveyor trolley has two material cart positions, allowing for the simultaneous loading of two workpieces. Each material cart is equipped with a set of conveyor rails and a conveyor device, allowing the cart to move back and forth along the rails. The vacuum brazing chamber includes a vacuum system, a vacuum furnace body, a brazing chamber material cart conveyor device, brazing chamber material cart rails, a heat shield, and a heater. The vacuum system is connected to the vacuum furnace body to form a vacuum seal. The brazing chamber material cart rails, heat shield, and heater are located inside the vacuum furnace body. The heater is located inside the heat shield, and the brazing chamber material cart rails are located on top of the heat shield. The heat shield consists of multiple layers of metal sheets. The material cart can be conveyed within the brazing chamber. Driven by the device, the material cart moves back and forth along the guide rail of the brazing chamber. The air-cooling chamber is equipped with an air-cooling chamber material cart conveying device, an air-cooling chamber material cart guide rail, and two or more fans. The fans are arranged on both sides of the air-cooling chamber. The material cart can move back and forth along the air-cooling chamber material cart guide rail under the drive of the air-cooling chamber material cart conveying device. When the conveying trolley moves between the vacuum brazing chamber and the air-cooling chamber, the conveying trolley material cart guide rail of one of the two material cart positions on the conveying trolley aligns with the brazing chamber material cart guide rail, and at the same time, the conveying trolley material cart guide rail of the other material cart position aligns with the air-cooling chamber material cart guide rail. The two material cart positions on the conveying trolley are simultaneously aligned with the vacuum brazing chamber and the air-cooling chamber respectively. When the air-cooled chamber is connected, one material cart can be transported back and forth between the conveyor trolley and the vacuum brazing chamber, and another material cart can be transported back and forth between the conveyor trolley and the air-cooled chamber. The loading and unloading workbench includes a workbench material cart guide rail and a workbench material cart conveying device. The material cart can move back and forth along the workbench material cart guide rail under the drive of the workbench material cart conveying device. When the conveyor trolley moves to the opposite side of the loading and unloading workbench, the conveyor trolley material cart guide rail of one material cart position on the conveyor trolley is aligned with the workbench material cart guide rail. This material cart position is connected to the loading and unloading workbench. After connection, the material cart at this material cart position can be transported back and forth between the conveyor trolley and the loading and unloading workbench.

2. The compact vacuum brazing equipment according to claim 1, characterized in that: A volatile matter trap is installed in the vacuum brazing chamber, with the traps located at both ends of the heat insulation screen; there are two or more volatile matter traps, and a cooling medium flows through them.

3. The compact vacuum brazing equipment according to claim 1, characterized in that: The heaters inside the vacuum brazing chamber are located on both sides of the chamber, and each side of the heaters is divided into more than 4 groups; each group of heaters has its own heating power supply and is equipped with its own thermocouple temperature control device.

4. The compact vacuum brazing equipment according to claim 3, characterized in that: The heaters on each side are divided into more than 9 groups; the highest temperature inside the heat shield is above 600℃.

5. The compact vacuum brazing equipment according to claim 1, characterized in that: The conveyor trolley track is laid on the ground, and the conveyor trolley material car guide rail is perpendicular to the conveyor trolley track; the conveyor trolley material car guide rail, the brazing chamber material car guide rail, the air-cooling chamber material car guide rail, and the worktable material car guide rail are located on the upper part of the conveyor trolley, the vacuum furnace body, the air-cooling chamber, and the loading and unloading worktable, respectively.

6. The compact vacuum brazing equipment according to claim 1, characterized in that: The vacuum system includes an oil diffusion vacuum pump, a Roots vacuum pump, a mechanical vacuum pump, and vacuum valves.

7. The compact vacuum brazing equipment according to claim 1, characterized in that: The vacuum furnace body has a rectangular box structure, and an inlet / outlet door is provided on one side of the vacuum furnace body.

8. The compact vacuum brazing equipment according to claim 1, characterized in that: This compact vacuum brazing equipment is used for vacuum brazing of aluminum or aluminum alloy structural components, with a maximum operating temperature range of 300-700℃.

9. A vacuum brazing production method, characterized in that: The production method uses the compact vacuum brazing equipment described in claim 1, mainly including: (1) placing the workpieces to be vacuum brazed on the loading and unloading workbench onto the material cart, and driving the conveyor trolley drive device to move the conveyor trolley so that the No. 1 material cart position is connected to the loading and unloading workbench, and transferring the material cart carrying the workpieces to be vacuum brazed from the loading and unloading workbench to the No. 1 material cart position of the conveyor trolley; (2) driving the conveyor trolley to move to the opposite side of the vacuum brazing chamber so that the No. 2 material cart position is connected to the vacuum brazing chamber, and then transferring the material cart carrying the completed vacuum brazing workpieces in the vacuum brazing chamber to the No. 2 material cart position of the conveyor trolley; (3) driving the conveyor trolley so that the No. 1 material cart position is connected to the vacuum brazing chamber, and at the same time connecting the No. 2 material cart position to the air cooling chamber; (4) transferring the material cart carrying the workpieces to be vacuum brazed on the No. 1 material cart position into the vacuum chamber. (5) Transfer the car carrying the vacuum-brazed workpieces on car position 2 into the air-cooling room, and then start the air-cooling program; (6) After the air-cooling program is completed, transfer the car carrying the air-cooled workpieces in the air-cooling room to car position 2 on the transfer trolley; (7) Drive the transfer trolley to connect car position 1 with the loading and unloading workbench, and transfer the new car carrying the workpieces that need to be vacuum-brazed on the loading and unloading workbench to car position 1 on the transfer trolley; (8) Drive the transfer trolley again to connect car position 2 with the loading and unloading workbench, and transfer the car carrying the air-cooled workpieces on car position 2 to the loading and unloading workbench, unload the workpieces that have been vacuum-brazed and cooled on the car, and then load the next batch of workpieces that need to be vacuum-brazed onto the car. The operation steps of (1)-(8) are repeated, and continuous vacuum brazing production is achieved by using a compact vacuum brazing equipment.

10. The vacuum brazing production method according to claim 9, characterized in that: When a trolley carrying workpieces requiring vacuum brazing is transferred from the loading / unloading workbench to the No. 1 trolley position of the transfer trolley, the workbench trolley transfer device and the transfer trolley trolley transfer device must be activated simultaneously to transfer the trolley to the No. 1 trolley position of the transfer trolley. The trolley will automatically stop after reaching the designated position and be locked in the designated position.

11. The vacuum brazing production method according to claim 9, characterized in that: When conveying the workpiece to be vacuum brazed from the No. 1 material car position of the conveyor trolley into the vacuum brazing chamber, the inlet and outlet doors of the vacuum brazing chamber must be opened before the material car enters the vacuum brazing chamber. Then, the conveyor trolley material car conveying device and the brazing chamber material car conveying device are activated to convey the material car into the vacuum brazing chamber. After the material car reaches the designated position, the inlet and outlet doors of the vacuum brazing chamber are closed, and the vacuuming process is started. After the vacuum brazing chamber reaches the specified vacuum level, the heating brazing process is started.

Images