Non-muffle rolling shaft type aluminum brazing furnace

Abstract

The invention provides a muffle-free rolling shaft type aluminum brazing furnace which comprises a feeding chamber, a brazing chamber, a cooling chamber and a discharging chamber which are sequentially connected in a sealed mode through flanges from front to back. The feeding chamber, the cooling chamber and the discharging chamber are each internally provided with a first sealing rolling shaft conveying device. A heat preservation layer is arranged in the brazing chamber, a heating element is installed on the heat preservation layer, a second sealing rolling shaft conveying device penetrating through the brazing chamber is further arranged in the brazing chamber, and a second rolling shaft of the second sealing rolling shaft conveying device is in static sealing connection with an outer shell of the brazing chamber. According to the muffle-free rolling shaft type aluminum brazing furnace, materials are conveyed through the multiple first sealing rolling shaft conveying devices and the multiple second sealing rolling shaft conveying devices, it is avoided that a conveying mesh belt is used for conveying the materials, and repeated heating and freezing of the mesh belt are avoided; and the energy consumption and the equipment maintenance cost are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial brazing furnaces, and in particular relates to a muffle-free roller-type aluminum brazing furnace. Background Art

[0002] Aluminum brazing furnace is a kind of equipment for effectively welding aluminum alloy parts. It is welded by taking advantage of the fact that the melting point of aluminum brazing alloy is lower than that of aluminum metal material. Brazing filler metal is usually placed near or inside the welding surface of the part to be connected. NOCOLOK aluminum brazing flux is applied between the part and the welding surface and on the surface. After installation and drying, the part is heated under the protection of a certain inert gas to a temperature at which the brazing alloy melts but the metal of the part does not melt. The inert gas used is generally nitrogen. At the same time, NOCOLOK aluminum brazing flux breaks the aluminum oxide film, allowing the molten metal to diffuse on the surface with the infusible metal. After cooling, the brazing filler metal will form a metal bond with the contact surface of the part.

[0003] At present, the conventional aluminum brazing furnace consists of an upper muffle sealing section and an open return section to form a mesh belt circulation closed loop. The upper muffle sealing section is composed of a front curtain-type muffle, a brazing heating section muffle, a cooling section muffle and a rear curtain chamber muffle. The open return section is composed of a driven roller, a feeding section, a discharging section, a driven roller, a return roller and an active roller. The mesh belt is driven in the open section. Because the temperature of the heating section muffle is above 600°C, the entire mesh belt must be selected according to the working conditions of the heating section, which leads to a high price of the mesh belt. In addition, the mesh belt is repeatedly heated and cooled during use, which consumes a lot of energy. This leads to high maintenance costs for the mesh belt and heating muffle in the later stage. At the same time, the heating muffle absorbs heating energy at the process temperature, consumes a lot of energy, and its service life is also limited. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a muffle-free roller-type aluminum brazing furnace.

[0005] The present invention proposes a muffle-free roller-type aluminum brazing furnace, comprising a feeding chamber, a brazing chamber, a cooling chamber and a discharging chamber, which are sealed and connected in sequence through flanges at the front and back; a first sealed roller conveying device is arranged inside the feeding chamber, the cooling chamber and the discharging chamber; an insulation layer is arranged in the brazing chamber, a heating element is installed on the insulation layer, a second sealed roller conveying device penetrating the brazing chamber is also arranged in the brazing chamber, and a second roller of the second sealed roller conveying device is statically sealed and connected to an outer shell of the brazing chamber; a nitrogen input pipe is arranged below the second sealed roller conveying device in the brazing chamber.

[0006] The present invention also has the following optional features.

[0007] Optionally, the first sealed roller transport device includes multiple pairs of first roller frames, multiple first rollers and a first drive motor, a first sprocket transmission mechanism is arranged between the ends of every two adjacent first rollers, and the first drive motor is transmission-connected to the end of the first first roller.

[0008] Optionally, the second sealed roller transport device includes multiple pairs of second roller frames, multiple second rollers and second drive motors, sealed bearing seats are arranged between the two ends of each second roller and the insulation layer, a sprocket transmission mechanism is arranged between the ends of every two adjacent second rollers, and the main shaft of the second drive motor is connected to the end of one of the second rollers in a driving manner.

[0009] Optionally, the brazing chamber includes an inner chamber body and an outer shell body arranged outside the inner chamber body, a hollow sealed cavity is provided between the inner chamber body and the outer shell body, the insulation layer is provided on the inner wall of the inner chamber body, and the second roller of the sealed roller transport device sequentially passes through the inner chamber body, the sealed cavity and the outer shell body, and is statically sealed and connected to the outer shell body.

[0010] Optionally, the shaft ends of the second rollers extend into the sealed cavity, the sprocket transmission mechanism is arranged between the sealed bearing seat and the outer shell, and one end of the second rollers extends out of the outer shell and is transmission-connected to the second drive motor.

[0011] Optionally, a plurality of the second drive motors are provided, the plurality of the second drive motors are arranged at equal intervals, and a main shaft of each of the second drive motors is drivingly connected to an axial end of one of the second rollers.

[0012] Optionally, multiple layers of stainless steel curtains are provided in the feeding chamber and the discharging chamber, and sealing flange covers are installed on the shells of the feeding chamber and the discharging chamber.

[0013] Optionally, the lower parts of the feeding chamber and the discharging chamber are respectively provided with walking wheels.

[0014] Optionally, both the feeding chamber and the discharging chamber are provided with a smoke exhaust treatment system.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The muffle-free roller-type aluminum brazing furnace of the present invention is provided with a first sealed roller conveyor in the feeding chamber, the cooling chamber and the discharging chamber, and a second sealed roller conveyor in the brazing chamber, and the materials are transported by a plurality of first sealed roller conveyors and second sealed roller conveyors, and an insulation layer and a heating element are provided in the brazing chamber, so that the temperature in the feeding chamber, the brazing chamber, the cooling chamber and the discharging chamber is relatively stable, avoiding the use of a transmission mesh belt to transport materials, avoiding repeated heating and freezing of the mesh belt, and reducing energy consumption and equipment maintenance costs. The present invention replaces the entire mesh belt that originally runs through the entire brazing furnace with an online independent roller, reducing the energy consumption of repeated heating, cooling and heat transfer of the mesh belt. The present invention removes the existing heating muffle, reducing manufacturing and maintenance costs. In order to make the above contents of the present invention more obvious and easy to understand, the following is a preferred embodiment, and is described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other design solutions and drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the full cross-section structure of the muffle-free roller-type aluminum brazing furnace of the present invention; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at AA in FIG. Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at BB in FIG. Figure 4 yes Figure 3 A partial enlarged structural diagram of the feeding chamber in FIG. Figure 5 yes Figure 3 A partial enlarged structural diagram of the brazing chamber.

[0018] In the above figure: 1. feeding chamber; 101. feeding door; 102. supporting frame; 2. brazing chamber; 201. sealing cavity; 3. cooling chamber; 4. discharging chamber; 401. discharging door; 5. first sealed roller transport device; 501. first roller frame; 502. first roller; 503. first drive motor; 504. first sprocket transmission mechanism; 6. insulation layer; 7. heating element; 8. second sealed roller transport device; 801. second roller frame; 802. second roller; 803. second drive motor; 804. sealed bearing seat; 805. second sprocket transmission mechanism; 9. nitrogen inlet pipe; 10. stainless steel curtain; 11. sealing flange cover; 12. walking wheel; 13. smoke exhaust treatment system; 14. brazing material.

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0020] Example 1 refer to Figure 1 , Figure 2 and Figure 3 An embodiment of the present invention proposes a muffle-free roller-type aluminum brazing furnace, comprising a feeding chamber 1, a brazing chamber 2, a cooling chamber 3 and a discharging chamber 4, which are sealed and connected in sequence through flanges; a first sealed roller conveyor 5 is arranged inside the feeding chamber 1, the cooling chamber 3 and the discharging chamber 4; a thermal insulation layer 6 is arranged in the brazing chamber 2, and a heating element 7 is installed on the thermal insulation layer 6; a second sealed roller conveyor 8 that penetrates the brazing chamber 2 is also arranged in the brazing chamber 2, and a second roller 802 of the second sealed roller conveyor 8 is statically sealed and connected to an outer shell of the brazing chamber 2; a nitrogen inlet pipe 9 is arranged below the second sealed roller conveyor 8 in the brazing chamber 2.

[0021] An electric feeding door 101 is provided at the front end of the feeding chamber 1 , and an electric discharging door 401 is provided at the rear end of the discharging chamber 4 .

[0022] When in use, the feed door 101 is opened, and the brazing material 14 is placed on the first sealed roller conveyor 5. The first sealed roller conveyor 5 conveys the brazing material 14 into the feeding chamber 1, and then the brazing material 14 enters the brazing chamber 2. During the process of being conveyed through the brazing chamber 2 by the second sealed roller conveyor 8, the heating element 7 heats the brazing chamber 2. A nitrogen inlet pipe 9 arranged below the second sealed roller conveyor 8 is provided with a plurality of small holes. Nitrogen is dispersed in the brazing chamber 2 through the small holes on the nitrogen inlet pipe 9. During the conveyance by the second sealed roller conveyor 8, the brazing material 14 is heated by the heating element 7 and protected by nitrogen, and will not be oxidized until the brazing material 14 is sent to the cooling chamber 3. During the conveyance by the first sealed roller conveyor 5 in the cooling chamber 3, it is slowly cooled. Then, the brazing material 14 is sent to the discharging chamber 4 by the first sealed roller conveyor 5, and finally sent out from the discharging door 401.

[0023] Example 2 refer to Figure 1 , Figure 3 and Figure 4 On the basis of Example 1, the first sealed roller transport device 5 includes multiple pairs of first roller frames 501, multiple first rollers 502 and a first drive motor 503, a first sprocket transmission mechanism 504 is arranged between the ends of every two adjacent first rollers 502, and the first drive motor 503 is connected to the end of the first first roller 502 by transmission.

[0024] The feeding chamber 1, the cooling chamber 3 and the discharging chamber 4 all have a sealed outer shell, and the outer shell is arranged on a support frame 102; the first sealed roller transport device 5 is arranged in the outer shell to ensure that nitrogen does not leak, and two sprockets are arranged at one end of each first roller 502, and the sprockets on every two adjacent first rollers 502 are connected to form a first sprocket transmission structure 504, and each first roller 502 is synchronously connected in turn through the first sprocket transmission mechanism 504. When the first drive motor 503 drives the first first roller 502 on one side to rotate through the sprocket and the transmission chain, each first roller 502 rotates synchronously.

[0025] Example 3 refer to Figure 1 , Figure 2 , Figure 3 and Figure 5 On the basis of Example 1, the second sealed roller transport device 8 includes multiple pairs of second roller frames 801, multiple second rollers 802 and a second drive motor 803, and sealed bearing seats 804 are respectively arranged between the two ends of each second roller 802 and the insulation layer 6, and a sprocket transmission mechanism 805 is respectively arranged between the ends of every two adjacent second rollers 802, and the main shaft of the second drive motor 803 is transmission-connected to the end of one of the second rollers 802.

[0026] The second sealed roller transport device 8 is arranged in the brazing chamber 2, and two sprockets are arranged on the same end of each second roller 802 in the second sealed roller transport device 8, and one of the sprockets on every two adjacent second rollers 802 is connected to form a second sprocket transmission mechanism 805, and each second roller 802 is synchronously connected through the second sprocket transmission mechanism 805 in turn. One end of the first second roller 802 in the second sealed roller transport device 8 extends out of the brazing chamber 2. When the second driving motor 803 located outside the brazing chamber 2 drives the first second roller 802 on one side to rotate through the sprocket and the transmission chain, each second roller 802 rotates synchronously.

[0027] Example 4 refer to Figure 1 , Figure 3 and Figure 5 On the basis of Example 3, the brazing chamber 2 includes an inner chamber body and an outer shell body arranged outside the inner chamber body, a hollow sealed cavity 201 is provided between the inner chamber body and the outer shell body, the thermal insulation layer 6 is provided on the inner wall of the inner chamber body, and the second roller 802 of the sealed roller transport device 8 passes through the inner chamber body, the sealed cavity 201 and the outer shell body in sequence, and is statically sealed and connected to the outer shell body.

[0028] Furthermore, the shaft ends of the second rollers 802 extend into the sealing cavity 201 , and the sprocket transmission mechanism 805 is arranged between the sealing bearing seat 804 and the outer shell, and one end of the second rollers 802 extends out of the outer shell and is transmission-connected to the second drive motor 803 .

[0029] The brazing chamber 2 has a sealed outer shell and a sealed insulation layer 6. Each pair of second roller frames 801 are respectively arranged on the outer shell of the brazing chamber 2. The two ends of the second roller 802 pass through the insulation layer 6 and are rotatably arranged on the second roller frames 801. The second sprocket transmission mechanisms 805 are all located in the sealed cavity 201 formed between the outer shell of the brazing chamber 2 and the insulation layer 6, which can minimize nitrogen leakage.

[0030] Example 5 refer to Figure 1 and Figure 3 On the basis of Example 4, a plurality of second drive motors 803 are provided, and the plurality of second drive motors 803 are arranged at equal intervals, and the main shaft of each second drive motor 803 is drivingly connected to the shaft end of one of the second rollers 802 .

[0031] Since the brazing chamber 2 is relatively long, the distribution range of the second sealed roller transport device 8 is also relatively long, which requires that a second drive motor 803 be arranged every four meters. Each second drive motor 803 drives a plurality of second rollers 802 to rotate respectively, thereby improving the conveying efficiency of the second sealed roller transport device 8 for the brazing material 14.

[0032] Example 6 refer to Figure 1 On the basis of Example 1, a multi-layer stainless steel curtain 10 is provided in the feeding chamber 1 and the discharging chamber 3, and a sealing flange cover 11 is installed on the shell of the feeding chamber 1 and the discharging chamber 3.

[0033] The multi-layer stainless steel curtain 10 can block the outside air from entering the feeding chamber 1 and the discharging chamber 3, and minimize the emission of nitrogen from the feeding chamber 1 and the discharging chamber 3. The sealing flange cover 11 on the housing of the feeding chamber 1 and the discharging chamber 3 can be conveniently installed with the stainless steel curtain 10.

[0034] Example 7 refer to Figure 1 On the basis of Example 1, the lower parts of the feeding chamber 1 and the discharging chamber 3 are respectively provided with walking wheels 12.

[0035] When the temperature rises, the outer shells of the feeding chamber 1 and the discharging chamber 3 expand and extend, and when the temperature drops, the outer shells of the feeding chamber 1 and the discharging chamber 3 shrink, and at this time, the traveling wheels 12 can be used to perform adaptive movement.

[0036] Example 8 refer to Figure 1 On the basis of Example 1, a smoke exhaust treatment system 13 is provided on the feeding chamber 1 and the discharging chamber 3 .

[0037] The smoke exhaust treatment system 13 is respectively arranged at the feed door 101 of the feeding chamber 1 and the discharge door 401 of the discharge chamber 4, and is used to filter and discharge the gas discharged from the feeding chamber 1 and the discharge chamber 4. It adopts a conventional filtering and discharging structure and is equipped with a filter chamber, an exhaust fan and a pipeline.

[0038] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The components and structures not described in detail in this embodiment are well-known components and common structures or common means in the industry, and are not described here one by one.

Claims

1. A muffle-free roller-type aluminum brazing furnace, characterized in that: The invention comprises a feeding chamber (1), a brazing chamber (2), a cooling chamber (3) and a discharging chamber (4) which are sealed and connected in sequence through flanges at the front and the back; a first sealed roller conveying device (5) is arranged inside the feeding chamber (1), the cooling chamber (3) and the discharging chamber (4); a heat-insulating layer (6) is arranged inside the brazing chamber (2), a heating element (7) is installed on the heat-insulating layer (6); a second sealed roller conveying device (8) which passes through the brazing chamber (2) is also arranged inside the brazing chamber (2), and a second roller (802) of the second sealed roller conveying device (8) is statically sealed and connected to an outer shell of the brazing chamber (2); a nitrogen inlet pipe (9) is arranged below the second sealed roller conveying device (8) in the brazing chamber (2).

2. The muffle-free roller-type aluminum brazing furnace according to claim 1, characterized in that: The first sealed roller transport device (5) comprises a plurality of pairs of first roller frames (501), a plurality of first rollers (502) and a first drive motor (503), a first sprocket transmission mechanism (504) being arranged between the ends of every two adjacent first rollers (502), and the first drive motor (503) being in driving connection with the end of a first of the first rollers (502).

3. The muffle-free roller-type aluminum brazing furnace according to claim 1, characterized in that: One or more first drive motors (503) are provided, and the plurality of first drive motors (503) are arranged at intervals, and the main shaft of each first drive motor (503) is drivingly connected to the shaft end of one of the first rollers (502).

4. The muffle-free roller-type aluminum brazing furnace according to claim 1, characterized in that: The second sealed roller transport device (8) comprises a plurality of pairs of second roller frames (801), a plurality of second rollers (802) and a second drive motor (803); a sealed bearing seat (804) is provided between the two ends of each second roller (802) and the thermal insulation layer (6); a sprocket transmission mechanism (805) is provided between the ends of each two adjacent second rollers (802); and a main shaft of the second drive motor (803) is in driving connection with the end of one of the second rollers (802).

5. The muffle-free roller-type aluminum brazing furnace according to claim 4, characterized in that: The brazing chamber (2) comprises an inner chamber body and an outer shell body arranged outside the inner chamber body, a hollow sealed cavity (201) is provided between the inner chamber body and the outer shell body, the thermal insulation layer (6) is provided on the inner wall of the inner chamber body, and the second roller (802) of the sealed roller transport device (8) passes through the inner chamber body, the sealed cavity (201) and the outer shell body in sequence, and is statically sealedly connected to the outer shell body.

6. The muffle-free roller-type aluminum brazing furnace according to claim 5, characterized in that: The shaft ends of the second rollers (802) both extend into the sealing cavity (201), and the sprocket transmission mechanism (805) is arranged between the sealing bearing seat (804) and the outer shell, wherein an end of one of the second rollers (802) extends out of the outer shell and is transmission-connected to the second drive motor (803).

7. The muffle-free roller-type aluminum brazing furnace according to claim 4, characterized in that: One or more second drive motors (803) are provided, and the plurality of second drive motors (803) are arranged at equal intervals, and the main shaft of each second drive motor (803) is drivingly connected to the shaft end of one of the second rollers (802).

8. The muffle-free roller-type aluminum brazing furnace according to claim 1, characterized in that: Multiple layers of stainless steel curtains (10) are provided in the feeding chamber (1) and the discharging chamber (3), and sealing flange covers (11) are installed on the shells of the feeding chamber (1) and the discharging chamber (3).

9. The muffle-free roller-type aluminum brazing furnace according to claim 1, characterized in that: Travel wheels (12) are respectively provided at the lower parts of the feeding chamber (1) and the discharging chamber (3).

10. The muffle-free roller-type aluminum brazing furnace according to claim 1, characterized in that: The feeding chamber (1) and the discharging chamber (3) are both provided with a smoke exhaust processing system (13).

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