A continuous vacuum brazing apparatus

Abstract

The application discloses a continuous vacuum brazing equipment, which comprises a plurality of vacuum chambers arranged in a straight line, including a preheating chamber, a brazing chamber and a cooling chamber; an oil removal system is arranged in the vacuum system of the preheating chamber; a strong cooling chamber is arranged downstream of the cooling chamber; the continuous vacuum brazing equipment further comprises a rack and a rack running mechanism; the rack is used for carrying workpieces, and the rack running mechanism is arranged at the upper part of the vacuum chambers and the strong cooling chamber; the rack is hung on the rack running mechanism and moves between the chambers along the guide rail on the rack running mechanism; the continuous vacuum brazing equipment further comprises a fixed frame and an external rack running mechanism; a transverse moving rack is arranged at the strong cooling chamber end and the preheating chamber end of the continuous vacuum brazing equipment respectively; the rack running mechanism, the external rack running mechanism and the transverse moving rack jointly form a ring-shaped running path of the rack.

Description

Technical Field

[0001] This invention belongs to the field of vacuum furnace technology, and in particular relates to a continuous vacuum brazing equipment. Background Technology

[0002] Due to its strong adaptability in practical applications, aluminum alloy vacuum brazing is widely used in various industrial sectors such as aviation, aerospace, petrochemical, electronics, air separation, cryogenics, vehicles, and ships. Among them, heat exchangers are a relatively important application of aluminum alloy vacuum brazing. Specific products mainly include evaporators and condensers for automotive air conditioning, automotive radiators, oil coolers, and plate-fin heat exchangers in air separation equipment.

[0003] The implementation of vacuum brazing technology for aluminum alloys places high demands on equipment, requiring vacuum brazing equipment with excellent heating and vacuum performance. For large-scale vacuum brazing production, the capacity, performance stability, and consistency of the equipment become particularly important. Therefore, continuous vacuum brazing equipment has gradually become the mainstream in demand for aluminum alloy vacuum brazing equipment. Furthermore, since aluminum alloy vacuum brazing often uses metal activators such as magnesium and bismuth, when the brazed products are large, the volatile substances from these activators can cause serious metal contamination inside the vacuum brazing equipment, affecting equipment performance and brazed product quality. Current continuous vacuum brazing equipment lacks effective means for the rapid capture and timely cleaning of the volatile metal substances generated during vacuum brazing, which has a certain impact on large-scale vacuum aluminum brazing production. On the other hand, grease residue may remain on the surface of irregularly shaped aluminum alloy components during the pressing and forming process. This grease can contaminate the welding interface during vacuum brazing, thus affecting the quality of the vacuum brazing. Summary of the Invention

[0004] This invention provides a continuous vacuum brazing apparatus, comprising multiple vacuum chambers arranged in a straight line, each vacuum chamber including at least a preheating chamber, a brazing chamber, and a cooling chamber; a vacuum isolation valve is provided between two adjacent vacuum chambers; each of the preheating chamber, brazing chamber, and cooling chamber is equipped with a vacuum system; an oil removal system is provided in the vacuum system of the preheating chamber; a forced cooling chamber is located downstream of the cooling chamber, the forced cooling chamber being a non-vacuum chamber, and is equipped with at least four fans; the continuous vacuum brazing apparatus also includes a material rack and a material rack traveling mechanism; the material rack is used to carry workpieces, and the material rack traveling mechanism is located above the vacuum chambers and the forced cooling chamber; the material rack is suspended on the material rack traveling mechanism and moves between the multiple vacuum chambers and the forced cooling chamber along the guide rails on the material rack traveling mechanism; the continuous vacuum brazing apparatus also includes a fixed frame and an external material rack traveling mechanism; the fixed frame is located between the vacuum chamber and the forced cooling chamber. The external material rack is arranged outside the cold chamber, parallel to the arrangement direction of the vacuum chamber and the forced cooling chamber. An external material rack traveling mechanism is located on the upper part of the fixed frame. Transverse material carts are respectively installed at the forced cooling chamber end and the preheating chamber end of the continuous vacuum brazing equipment. After the material rack moves out of the forced cooling chamber via the material rack traveling mechanism, the transverse material cart at the forced cooling chamber end can carry the material rack laterally, transferring it to the starting end of the fixed frame and suspending it on the external material rack traveling mechanism. When the material rack moves along the guide rail of the external material rack traveling mechanism to the end of the fixed frame, the transverse material cart at the preheating chamber end can carry the material rack laterally, transferring it to the vacuum chamber at the starting end of the continuous vacuum brazing equipment and suspending it on the material rack traveling mechanism. The lateral movement direction is perpendicular to the inter-chamber movement direction. The material rack traveling mechanism, the external material rack traveling mechanism, and the transverse material carts together constitute the circular traveling path of the material rack.

[0005] The starting end of the fixed frame can be located opposite the strong cooling chamber end of the continuous vacuum brazing equipment, or it can be located away from the loading and unloading area of ​​the continuous vacuum brazing equipment. When the starting end of the fixed frame is located opposite the strong cooling chamber end of the continuous vacuum brazing equipment, after the material rack is moved out of the strong cooling chamber by the material rack traveling mechanism, the material rack is moved laterally by the transverse material trolley at the strong cooling chamber end, transferring the material rack to the starting end of the fixed frame and suspending the material rack on the external material rack traveling mechanism. During the process of the material rack moving along the guide rail of the external material rack traveling mechanism to the end of the fixed frame, it will pass through the loading and unloading area. In the loading and unloading area, the material rack unloads the brazed workpieces and loads the workpieces to be brazed before continuing to move to the end of the fixed frame. When the starting end of the fixed frame is set in the loading and unloading area far away from the continuous vacuum brazing equipment, the rack moves out of the strong cooling chamber through the rack traveling mechanism and continues to move to the loading and unloading area. After the rack unloads the brazed workpiece and loads the workpiece to be brazed in the loading and unloading area, the rack is then moved laterally by the transverse trolley at the end of the strong cooling chamber, transferring the rack to the starting end of the fixed frame and suspending the rack on the external rack traveling mechanism.

[0006] In the loading and unloading area, the process of unloading brazed workpieces and loading workpieces to be brazed is carried out by robotic arms or manual labor. Since the height of the material rack can reach 2.5-3 meters, the material rack position can be lowered first by the lifting mechanism to load and unload the workpieces on the upper layer of the material rack. Then the lifting mechanism can be used to gradually raise the material rack position to load and unload the workpieces on the middle and lower layers of the material rack.

[0007] A volatile matter collection device is provided in at least one vacuum chamber among the preheating chamber, brazing chamber, and cooling chamber, and is provided in at least the brazing chamber. The heater inside the brazing chamber is disposed on two inner side walls of the brazing chamber; the volatile matter collection device is also disposed on two inner side walls of the brazing chamber, and the inner side wall where the volatile matter collection device is disposed is concave compared to the side where the heater is disposed, so that the surface of the volatile matter collection device is further away from the material rack compared to the surface of the heater on that side. In one embodiment of the invention, the volatile matter collection device includes two cylindrical cooling bodies, each containing a cooling medium; when the volatile matter collection device is in operation, the two cylindrical cooling bodies rotate synchronously. The volatile matter collection device is disposed on a flange or rotating door mounted on the side wall of the vacuum chamber. The volatile matter collection device in this invention is installed at a position that makes the volatile matter collection surface farther away from the workpiece on the rack compared to the heater surface on that side. This avoids the lower temperature of the volatile matter collection device surface affecting the heating effect on the workpiece. Furthermore, the device is installed on a detachable flange or rotating door on the side wall of the vacuum chamber, which facilitates timely replacement and cleaning of the cylindrical cooling body covered with volatile matter, thereby improving the volatile matter collection effect.

[0008] The brazing chamber is equipped with a heat insulation screen and heaters; the heat insulation screen is installed on the two inner side walls of the brazing chamber; the heaters are arranged in multiple sections and are suspended on the inner side of the heat insulation screen located on the inner side wall of the brazing chamber, and the maximum heating temperature of the heaters is above 510℃; the distance between the heaters on the heat insulation screen suspended on the inner side wall of the brazing chamber is no more than 800mm, and the width of the material rack is no more than 550mm.

[0009] The oil removal system includes a condenser and an oil mist filter. The condenser is connected to the exhaust end of the vacuum system, and the oil mist filter is located downstream of the condenser. The oil mist filter has a cyclone separator structure, and its interior contains a grid-equipped drum that rotates at a certain speed during operation. Both the condenser and the oil mist filter have oil drain lines leading to an oil collection container. The gas extracted from the preheating chamber is filtered by the oil removal system and then discharged into the workshop. The drum has 2-4 layers of grids with irregular shapes. These 2-4 layers of irregularly shaped grids combine to form a labyrinthine path from the inside out of the drum. A filter pad made of synthetic filter material is installed inside the drum. The labyrinthine path serves to prevent oil mist from leaking out of the drum and to rectify the discharged clean gas. After being blocked, the oil mist gathers into large droplets and drains along the grid into the oil drain line of the oil mist filter.

[0010] When forming irregularly shaped workpieces requiring vacuum brazing, a certain amount of grease may remain on the workpiece surface. To ensure the quality of vacuum brazing, the grease must be removed from the workpiece surface before welding. In this invention, the continuous vacuum brazing equipment equipped with the aforementioned degreasing system allows workpieces to be vacuum brazed to enter the equipment directly without prior cleaning with a cleaning agent. The workpieces undergo vacuum degreasing simultaneously during preheating in the preheating chamber. The oil-mist-containing gas extracted from the preheating chamber is filtered by the degreasing system to meet high environmental standards and can be directly discharged into the workshop. Verification using a weighing method shows that the equipment achieves a 100% grease removal rate from the workpieces using vacuum degreasing technology, resulting in excellent vacuum welding quality and a yield rate exceeding 95%. Furthermore, the oil-mist-containing gas extracted from the preheating chamber undergoes layer-by-layer treatment, ultimately meeting the Shanghai local emission standards (DB31 / 933-2015), allowing for indoor discharge.

[0011] In this invention, the cooling water for the vacuum chamber is provided by a separate vacuum chamber hot water cooling system. The cooling water temperature is set to 60-95°C, maintaining the temperature of the inner walls of the preheating chamber, brazing chamber, and cooling chamber above 60°C. In typical vacuum equipment, the cooling water temperature of the vacuum chamber is generally set at 10-20°C, keeping the chamber walls at a lower temperature. Because the valves of the preheating and cooling chambers in this invention's continuous vacuum brazing equipment need to be opened frequently, the vacuum chamber needs to reach the specified vacuum level as quickly as possible after the material rack enters for vacuum brazing. The applicant has found that when the valves of the preheating and cooling chambers are open, if the inner wall temperature of the vacuum chamber is low, moisture from the external environment easily adheres to the inner wall, severely affecting the vacuuming speed and effect, and also negatively impacting the quality of vacuum brazing of aluminum or aluminum alloys. Therefore, the cooling water for the vacuum chamber in this invention is provided by a separate vacuum chamber hot water cooling system. The cooling water temperature of the vacuum chamber is set to 60-95℃, maintaining the temperature of the inner walls of the preheating chamber, brazing chamber, and cooling chamber above 60℃. This achieves a "hot wall" effect on the inner walls of the vacuum chamber, preventing moisture from the external environment from adhering to the inner walls of the vacuum furnace when the valves are opened. This effectively improves the vacuuming speed and effect of the preheating chamber, brazing chamber, and cooling chamber, and enhances the welding quality of vacuum brazing. Furthermore, when the continuous vacuum brazing equipment of this invention is equipped with an oil removal system, the "hot wall" effect on the inner walls of the vacuum chamber also prevents oil mist from adhering to the inner walls during the oil removal process. This ensures that all oil mist is extracted and enters the oil removal system, effectively improving the oil removal effect and preventing oil droplets adhering to the inner walls of the vacuum chamber from affecting the quality of vacuum brazing.

[0012] The vacuum system of the brazing chamber includes a high vacuum pump, which is connected to the brazing chamber via a main valve. A maintenance door is provided on the main valve, through which the main valve seal can be replaced.

[0013] This continuous vacuum brazing equipment is used for vacuum brazing of aluminum or aluminum alloy structural components; the working temperature of the brazing chamber is 450-700℃. Attached Figure Description

[0014] Figure 1 This is a top view schematic diagram of one embodiment of the continuous vacuum brazing equipment of the present invention.

[0015] The accompanying drawings are not drawn to scale and are intended to illustrate the basic principles and structure of the invention. Simplified representations of structural features and components are used in the drawings. Specific design features of the invention (including, but not limited to, specific dimensions, orientations, positions, and shapes) will be determined and adjusted in part by the specific application and usage environment. Furthermore, the embodiments covered by the invention are not limited to those illustrated in the accompanying drawings. Detailed Implementation

[0016] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0017] like Figure 1 As shown, the continuous vacuum brazing equipment includes multiple vacuum chambers arranged in a straight line, each containing at least a preheating chamber 1, a brazing chamber 2, and a cooling chamber 3. Vacuum isolation valves 4 and 5 are respectively installed between adjacent vacuum chambers. Vacuum systems 6, 7, and 8 are respectively installed in the preheating chamber 1, brazing chamber 2, and cooling chamber 3. An oil removal system 9 is installed in the vacuum system 6 of the preheating chamber. A forced cooling chamber 10 is located downstream of the cooling chamber 3; the forced cooling chamber 10 is a non-vacuum chamber. The cooling chamber 10 is equipped with fans 11, and there are four or more fans 11. The continuous vacuum brazing equipment also includes a material rack and a material rack traveling mechanism 12. The material rack is used to carry the workpiece, and the material rack traveling mechanism 12 is located above the vacuum chamber and the forced cooling chamber. The material rack is suspended on the material rack traveling mechanism 12 and moves between multiple vacuum chambers and forced cooling chambers along the guide rails on the material rack traveling mechanism 12. The continuous vacuum brazing equipment also includes a fixed frame 13 and an external material rack traveling mechanism 14. The fixed frame 13 is located in the vacuum chamber. The external material rack is arranged outside the forced cooling chamber and parallel to the arrangement direction of the vacuum chamber and the forced cooling chamber; the external material rack traveling mechanism 14 is set on the upper part of the fixed frame 13; a transverse material cart 15 and a transverse material cart 16 are respectively set at the forced cooling chamber end and the preheating chamber end of the continuous vacuum brazing equipment; after the material rack is moved out of the forced cooling chamber by the material rack traveling mechanism, the transverse material cart 15 at the forced cooling chamber end can carry the material rack and move laterally along the track 26, transferring the material rack to the starting end of the fixed frame 13 and suspending the material rack on the external material rack. On the traveling mechanism 14; when the material rack moves along the guide rail of the external material rack traveling mechanism 14 to the end of the fixed frame 13, the transverse material cart 16 at the preheating chamber end can carry the material rack and move laterally along the track 27, transferring the material rack to the vacuum chamber at the starting end of the continuous vacuum brazing equipment, and suspending the material rack on the material rack traveling mechanism 12; the transverse movement direction is perpendicular to the inter-chamber movement direction; the material rack traveling mechanism 12, the external material rack traveling mechanism 14, and the transverse material cart together constitute the circular traveling path of the material rack. Figure 1 As shown, the workpiece-carrying rack 17 is suspended on the rack traveling mechanism 12 and is being vacuum brazed in the brazing chamber 2; the rack 18 has been moved out of the cooling chamber 10 and is being moved by the transverse trolley 15 at the end of the cooling chamber to the starting end of the fixed frame 13, whereby the rack will be suspended on the external rack traveling mechanism 14; the rack 19 is moving along the guide rail of the external rack traveling mechanism 14 toward the end of the fixed frame; the rack 20 is being moved laterally by the transverse trolley 16 at the end of the preheating chamber to the outside of the vacuum valve 25 of the preheating chamber 1, whereby the rack will be transferred to the rack traveling mechanism 12 in the preheating chamber.

[0018] The starting end of the fixed frame can be located opposite the strong cooling chamber end of the continuous vacuum brazing equipment, or it can be located away from the loading and unloading area of ​​the continuous vacuum brazing equipment. When the starting end of the fixed frame is located opposite the strong cooling chamber end of the continuous vacuum brazing equipment, after the material rack is moved out of the strong cooling chamber by the material rack traveling mechanism, the material rack is moved laterally by the transverse material trolley at the strong cooling chamber end, transferring the material rack to the starting end of the fixed frame and suspending the material rack on the external material rack traveling mechanism. During the process of the material rack moving along the guide rail of the external material rack traveling mechanism to the end of the fixed frame, it will pass through the loading and unloading area. In the loading and unloading area, the material rack unloads the brazed workpieces and loads the workpieces to be brazed before continuing to move to the end of the fixed frame. When the starting end of the fixed frame is set in the loading and unloading area far away from the continuous vacuum brazing equipment, the rack moves out of the strong cooling chamber through the rack traveling mechanism and continues to move to the loading and unloading area. After the rack unloads the brazed workpiece and loads the workpiece to be brazed in the loading and unloading area, the rack is then moved laterally by the transverse trolley at the end of the strong cooling chamber, transferring the rack to the starting end of the fixed frame and suspending the rack on the external rack traveling mechanism.

[0019] In the loading and unloading area, the process of unloading brazed workpieces and loading workpieces to be brazed is carried out by robotic arms or manual labor. Since the height of the material rack can reach 2.5-3 meters, the material rack position can be lowered first by the lifting mechanism to load and unload the workpieces on the upper layer of the material rack. Then the lifting mechanism can be used to gradually raise the material rack position to load and unload the workpieces on the middle and lower layers of the material rack.

[0020] A volatile matter collection device is provided in at least one vacuum chamber among the preheating chamber, brazing chamber, and cooling chamber, and a volatile matter collection device is provided in at least the brazing chamber. Figure 1In the illustrated embodiment, a volatile matter collection device 21 is provided in the brazing chamber 2. A heat insulation screen 22 and a heater 23 are provided inside the brazing chamber. The heat insulation screen 22 is located on the two inner side walls of the brazing chamber. The heaters 23 are arranged in multiple sections, each suspended inside the heat insulation screen 22 located on the inner side wall of the brazing chamber. The maximum heating temperature of the heaters is above 510°C. The distance between the heaters suspended on the heat insulation screen on the inner side wall of the brazing chamber is no greater than 800 mm, and the width of the material rack is no greater than 550 mm. The heaters 23 in the brazing chamber are located on the two inner side walls of the brazing chamber. The volatile matter collection device 21 is also located on the two inner side walls of the brazing chamber, and the inner side wall where the volatile matter collection device is located is concave compared to the location of the heater on that side, so that the surface of the volatile matter collection device is further away from the material rack compared to the surface of the heater on that side. In one embodiment of the present invention, the volatile matter collection device includes two cylindrical cooling bodies, each containing a cooling medium. During operation, the two cylindrical cooling bodies rotate synchronously. The volatile matter collection device is mounted on a flange 24 installed on the side wall of the vacuum chamber. The installation position of the volatile matter collection device in this invention ensures that the volatile matter collection surface is further away from the workpiece on the rack compared to the heater surface on that side. This avoids the lower surface temperature of the volatile matter collection device affecting the heating effect on the workpiece. Furthermore, the device is mounted on a detachable flange or rotating door on the side wall of the vacuum chamber, facilitating timely replacement and cleaning of the cylindrical cooling bodies covered with volatile matter, thus improving the volatile matter collection effect.

[0021] The oil removal system includes a condenser and an oil mist filter. The condenser is connected to the exhaust end of the vacuum system, and the oil mist filter is located downstream of the condenser. The oil mist filter has a cyclone separator structure, and its interior contains a grid-equipped drum that rotates at a certain speed during operation. Both the condenser and the oil mist filter have oil drain lines leading to an oil collection container. The gas extracted from the preheating chamber is filtered by the oil removal system and then discharged into the workshop. The drum has 2-4 layers of grids with irregular shapes. These 2-4 layers of irregularly shaped grids combine to form a labyrinthine path from the inside out of the drum. A filter pad made of synthetic filter material is installed inside the drum. The labyrinthine path serves to prevent oil mist from leaking out of the drum and to rectify the discharged clean gas. After being blocked, the oil mist gathers into large droplets and drains along the grid into the oil drain line of the oil mist filter.

[0022] The vacuum chamber's cooling water is supplied by a separate vacuum chamber hot water cooling system. The cooling water temperature is set at 60-95℃, maintaining the temperature of the inner walls of the preheating chamber, brazing chamber, and cooling chamber above 60℃. This achieves a "hot wall" effect on the inner walls, preventing moisture from the external environment from adhering to the inner walls of the vacuum furnace when the valves are opened. This effectively improves the vacuuming speed and efficiency of the preheating, brazing, and cooling chambers, thus enhancing the welding quality of vacuum brazing. Furthermore, the "hot wall" effect also prevents oil mist from adhering to the inner walls during the degreasing process, ensuring all oil mist is extracted and enters the degreasing system. This effectively improves the degreasing effect and prevents oil droplets adhering to the inner walls from affecting the quality of vacuum brazing.

[0023] The vacuum system of the brazing chamber includes a high vacuum pump, which is connected to the brazing chamber via a main valve. A maintenance door is provided on the main valve, through which the main valve seal can be replaced.

[0024] This continuous vacuum brazing equipment is used for vacuum brazing of aluminum or aluminum alloy structural components; the working temperature of the brazing chamber is 450-700℃.

Claims

1. A continuous vacuum brazing apparatus, characterized by: The continuous vacuum brazing device comprises a plurality of vacuum chambers arranged in a straight line, at least including a preheating chamber, a brazing chamber and a cooling chamber; a vacuum isolation valve is arranged between two adjacent vacuum chambers; the preheating chamber, the brazing chamber and the cooling chamber are all provided with a vacuum system; an oil removal system is arranged in the vacuum system of the preheating chamber; a strong cooling chamber is arranged downstream of the cooling chamber, the strong cooling chamber is a non-vacuum chamber, the strong cooling chamber is provided with a fan, and the fan has more than four; the continuous vacuum brazing device further comprises a rack and a rack running mechanism; the rack is used for carrying workpieces, and the rack running mechanism is arranged at the upper part of the vacuum chambers and the strong cooling chamber; the rack is hung on the rack running mechanism and moves between the chambers along the guide rail on the rack running mechanism; the continuous vacuum brazing device further comprises a fixed frame and an external rack running mechanism; the fixed frame is arranged outside the vacuum chambers and the strong cooling chamber and is arranged in parallel with the arrangement direction of the vacuum chambers and the strong cooling chamber; the external rack running mechanism is arranged at the upper part of the fixed frame; a transverse moving trolley is arranged at the end of the strong cooling chamber and the end of the preheating chamber of the continuous vacuum brazing device; after the rack moves out of the strong cooling chamber through the rack running mechanism, the transverse moving trolley at the end of the strong cooling chamber can move the rack transversely, transfer the rack to the starting end of the fixed frame and hang the rack on the external rack running mechanism; when the rack moves to the end of the fixed frame along the guide rail of the external rack running mechanism, the transverse moving trolley at the end of the preheating chamber can move the rack transversely, transfer the rack to the vacuum chamber at the starting end of the continuous vacuum brazing device and hang the rack on the rack running mechanism; the transverse moving direction is perpendicular to the chamber moving direction; the rack running mechanism, the external rack running mechanism and the transverse moving trolley jointly form a ring-shaped running path of the rack; The cooling water of the vacuum chamber is provided by a separate vacuum chamber hot water cooling system, the cooling water temperature of the vacuum chamber is set to 60-95℃, the inner wall temperature of the preheating chamber, the brazing chamber and the cooling chamber is kept above 60℃, the inner wall of the vacuum chamber realizes a hot wall effect, prevents water vapor in the external environment from adhering to the inner wall of the vacuum chamber when the door valve is opened, and prevents oil mist in the oil removal process from adhering to the inner wall of the vacuum chamber.

2. The continuous vacuum brazing apparatus according to claim 1, characterized in that: A volatile matter capturing device is arranged in at least one of the preheating chamber, the brazing chamber and the cooling chamber, and the volatile matter capturing device is arranged in at least the brazing chamber.

3. The continuous vacuum brazing apparatus of claim 2, wherein: The heaters in the brazing chamber are arranged on the two inner side walls of the brazing chamber; the volatile matter capturing device is also arranged on the two inner side walls of the brazing chamber, and the inner side wall where the volatile matter capturing device is arranged is recessed compared with the position where the heater of the side is arranged, so that the surface of the volatile matter capturing device is farther away from the surface of the heater of the side.

4. The continuous vacuum brazing apparatus of claim 1, wherein: The brazing chamber is provided with heat preservation screens and heaters; the heat preservation screens are arranged on the two inner side walls of the brazing chamber; the heaters are arranged in multiple blocks and are hung on the inner surfaces of the heat preservation screens arranged on the inner side walls of the brazing chamber; the highest heating temperature of the heaters is above 510℃; the distance between the heaters hung on the heat preservation screens on the inner side walls of the brazing chamber is not greater than 800mm, and the width of the rack is not greater than 550mm.

5. The continuous vacuum brazing apparatus of claim 2, wherein: The volatile substance capturing device comprises two cylindrical coolers, and cooling medium is circulated in the coolers; the two coolers rotate synchronously during the operation of the volatile substance capturing device.

6. The continuous vacuum brazing apparatus of claim 1, wherein: The oil removal system comprises a condenser and an oil mist filter; the condenser is connected to the exhaust end of the vacuum system, and the oil mist filter is arranged downstream of the condenser; the oil mist filter has a cyclone separation structure, and a rotating drum with a grid is arranged in the oil mist filter; the rotating drum rotates at a certain speed during the operation of the oil mist filter; the condenser and the oil mist filter are both provided with oil drain pipelines which lead to an oil collecting container; the gas extracted from the preheating chamber is filtered by the oil removal system and then discharged into the workshop chamber.

7. The continuous vacuum brazing apparatus of claim 6, wherein: 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 the 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 arranged on the inside of the rotating drum; the labyrinth path blocks the oil mist from leaking to the outside of the rotating drum and also functions to rectify the clean gas; the blocked oil mist is gathered into large droplets and then discharged to the oil drain pipeline of the oil mist filter along the grid.

8. The continuous vacuum brazing apparatus of claim 1, wherein: The vacuum system of the brazing chamber comprises a high vacuum pump, and the high vacuum pump is connected to the brazing chamber through a main valve; a maintenance door is arranged on the main valve, and the seal ring of the main valve can be replaced through the maintenance door.

9. The continuous vacuum brazing apparatus of claim 2, wherein: The volatile substance capturing device is arranged on a flange or a rotating door arranged on the side wall of the vacuum chamber.

10. The continuous vacuum brazing apparatus of claim 1, wherein: The continuous vacuum brazing equipment is used for the vacuum brazing of aluminum or aluminum alloy structural members; the working temperature of the brazing chamber is 450-700 DEG C.

11. The continuous vacuum brazing apparatus of claim 1, wherein: The starting end of the fixed frame is arranged opposite to the strong cooling chamber end of the continuous vacuum brazing equipment or is arranged away from the loading and unloading area of the continuous vacuum brazing equipment; when the starting end of the fixed frame is arranged opposite to the strong cooling chamber end of the continuous vacuum brazing equipment, the rack is moved out of the strong cooling chamber through the rack running mechanism, and then the rack is moved laterally by the lateral moving rack vehicle at the strong cooling chamber end, so that the rack is transferred to the starting end of the fixed frame and is hung on the external rack running mechanism; the rack moves to the end of the fixed frame and passes through the loading and unloading area in the process; the rack is unloaded and loaded after the brazing workpieces are unloaded and the workpieces to be brazed are loaded in the loading and unloading area; and then the rack is moved to the end of the fixed frame; when the starting end of the fixed frame is arranged away from the loading and unloading area of the continuous vacuum brazing equipment, the rack is moved out of the strong cooling chamber through the rack running mechanism and then continues to move to the loading and unloading area; the rack is unloaded and loaded after the brazing workpieces are unloaded and the workpieces to be brazed are loaded in the loading and unloading area; and then the rack is moved laterally by the lateral moving rack vehicle at the strong cooling chamber end, so that the rack is transferred to the starting end of the fixed frame and is hung on the external rack running mechanism.

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