Nitrogen tunnel furnace with vacuumizing function and product heating method

Abstract

The nitrogen tunnel furnace with the vacuumizing function comprises a tunnel furnace body and a baking device, the tunnel furnace body comprises a feeding port and a discharging port, and the baking device at least comprises a baking box; one end of a feeding hole of the tunnel furnace body is hermetically connected with a baking box, and a baking chamber is formed in the baking box; a feeding door is formed in the end, away from the feeding port of the tunnel furnace body, of the baking box. The feeding door is provided with a feeding door plate which is used for opening or closing the feeding door; a discharging door is arranged at the end, connected with the feeding port of the tunnel furnace body in a sealed mode, of the baking oven, the discharging door is provided with a discharging door plate used for opening or closing the feeding door, and the discharging door directly faces the feeding port of the tunnel furnace body. A first pipeline is arranged on one side of the baking box, the first pipeline is communicated to the baking chamber, and the first pipeline is configured to be switched between vacuumizing of the baking chamber and nitrogen filling of the baking chamber. The problems that bubbles remain in AB glue and the AB glue is oxidized in the heating and curing process are effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of material processing and drying equipment, in particular to a nitrogen tunnel furnace with a vacuum pumping function and a product heating method. Background Art

[0002] The tunnel furnace is a device for heating and curing the AB glue wrapped around the product (such as the charging connector of an electric vehicle). The existing tunnel furnace heats and cures the AB glue wrapped around the product (such as the charging connector of an electric vehicle) by feeding the product (such as the charging connector of an electric vehicle) wrapped with AB glue into the tunnel furnace cavity of the tunnel furnace.

[0003] However, after the AB glue is mixed and wrapped with the product (such as the electric vehicle charging connector), directly heating the AB glue using the existing tunnel furnace often makes it difficult to discharge the bubbles inside the AB glue, ultimately affecting the sealing performance of the AB glue on the product (such as the electric vehicle charging connector).

[0004] Although some tunnel furnaces provide nitrogen environment to reduce oxygen content, this method cannot completely remove the air inside the AB glue, so the AB glue is still prone to oxidation during the heating and curing process. These problems limit the improvement of product quality (such as electric vehicle charging connectors) and the optimization of production efficiency. Summary of the invention

[0005] The present invention proposes a nitrogen tunnel furnace with a vacuum pumping function and a product heating method to solve the technical problem that the existing tunnel furnace cannot completely remove the air inside the AB glue colloid, resulting in the AB glue still being easily oxidized.

[0006] One aspect of the present invention is to provide a nitrogen tunnel furnace with a vacuum pumping function, the nitrogen tunnel furnace comprising a tunnel furnace body and a baking device, the tunnel furnace body comprising a feed inlet and a discharge outlet, the baking device comprising at least a baking box;

[0007] Wherein, one end of the feed port of the tunnel furnace body is sealed and connected to the baking box, and a baking chamber is formed inside the baking box;

[0008] A feeding door is provided at one end of the baking oven away from the feeding port of the tunnel furnace body; the feeding door is provided with a feeding door plate for opening or closing the feeding door;

[0009] A discharge door is arranged at one end of the baking oven that is sealed and connected to the feed port of the tunnel furnace body. The discharge door is provided with a discharge door plate for opening or closing the feed door, and the discharge door faces the feed port of the tunnel furnace body.

[0010] A first pipeline is provided on one side of the baking oven, the first pipeline is connected to the baking chamber, and the first pipeline is configured to switch between evacuating the baking chamber and filling the baking chamber with nitrogen.

[0011] In a preferred embodiment, a second pipeline is further provided on one side of the baking oven, one end of the second pipeline is connected to the baking chamber, and the other end of the second pipeline is connected to the first heating device;

[0012] The first heating device heats the baking chamber through the second pipeline.

[0013] In a preferred embodiment, one end of the first pipeline is connected to the baking chamber, and the other end of the first pipeline is connected to a first three-way pipe;

[0014] The first three-way pipe includes a first joint and a second joint; the first joint is connected to a vacuum pump system, and the second joint is connected to a nitrogen supply system;

[0015] Wherein, a butterfly valve is arranged at the first joint of the first three-way pipe; when the butterfly valve is opened, the first pipeline is connected to the vacuum pump system through the first three-way pipe, and the baking chamber is evacuated by the vacuum pump system;

[0016] When the butterfly valve is closed, the first pipeline is connected to the nitrogen supply system through the first three-way pipe, and nitrogen is filled into the baking chamber through the nitrogen supply system.

[0017] In a preferred embodiment, the second joint of the first tee is connected to a second tee;

[0018] The second three-way pipe includes a third joint and a fourth joint; the third joint is provided with a gas nozzle, the gas nozzle is connected to the interface of the nitrogen supply system, and the fourth joint is provided with a vacuum gauge;

[0019] When the vacuum pump system evacuates the baking chamber, the vacuum gauge measures the vacuum degree of the baking chamber.

[0020] In a preferred embodiment, a first conveying guide rail is installed in the baking chamber, and the first conveying guide rail is used to convey the product out of the baking chamber through the discharge door.

[0021] In a preferred embodiment, the tunnel furnace body comprises a plurality of tunnel furnace units sealed and spliced ​​with each other;

[0022] Wherein, a tunnel furnace cavity is opened inside each tunnel furnace unit, and a nitrogen pipe is arranged on one side of the tunnel furnace unit, and the nitrogen pipe is connected to the tunnel furnace cavity for filling the tunnel furnace cavity with nitrogen;

[0023] The tunnel furnace cavities of two adjacent tunnel furnace units are interconnected, and the nitrogen pipes of two adjacent tunnel furnace units are sealed and connected to each other.

[0024] In a preferred embodiment, a second heating device is further provided on one side of each of the tunnel furnace units for heating the tunnel furnace cavity.

[0025] In a preferred embodiment, the heating temperatures of the second heating devices of different tunnel furnace units are different.

[0026] In a preferred embodiment, a second conveying guide rail is provided in the tunnel furnace cavity of each tunnel furnace unit;

[0027] The plurality of tunnel furnace units are sealed and spliced ​​with each other, and the second conveying guide rails of two adjacent tunnel furnace units are spliced ​​with each other.

[0028] Another aspect of the present invention is to provide a method for heating a product, wherein the method uses a nitrogen tunnel furnace with a vacuum pumping function provided by the present invention to heat the product, and comprises the following steps:

[0029] S1. Open the feeding door of the baking oven and place the product on the first conveying rail in the baking chamber;

[0030] S2, closing the feeding door panel and the discharging door panel of the baking oven to form a closed space in the baking chamber;

[0031] S3, opening the butterfly valve at the first joint of the first three-way pipe, and at the same time starting the vacuum pump system, so that the vacuum pump system evacuates the baking chamber;

[0032] S4, the vacuum pump system stops evacuating the baking chamber, and closes the butterfly valve at the first joint of the first three-way pipe;

[0033] The nitrogen supply system is turned on, the nitrogen supply system fills nitrogen into the baking chamber, and the first heating device heats the baking chamber;

[0034] S5, the nitrogen supply system fills the tunnel furnace cavity of each tunnel furnace unit with nitrogen through the nitrogen pipe, and the second heating device heats the tunnel furnace cavity of each tunnel furnace unit;

[0035] S6, opening the discharge door panel of the baking box; along the conveying direction, the first conveying rail conveys the product out of the baking chamber from the discharge door, and conveys it to the second conveying rail from the feed port of the tunnel furnace body;

[0036] S7, along the conveying direction, the second conveying track conveys the product to the tunnel furnace cavity in each tunnel furnace unit in sequence, and the second heating device of each tunnel furnace unit heats the product in sequence;

[0037] S8. The second conveying rail conveys the product out of the nitrogen tunnel furnace from the discharge port of the tunnel furnace body.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention proposes a nitrogen tunnel furnace with a vacuuming function and a method for heating products. One end of the feed port of the tunnel furnace body is sealed and connected to a baking oven. By vacuuming the baking chamber, the bubbles inside the AB glue colloid that wraps the product are effectively discharged, and then nitrogen is filled into the baking chamber, so that the AB glue that wraps the product is in a nitrogen environment. And because one end of the feed port of the tunnel furnace body is sealed with the baking oven, during the process of the product being transported from the baking oven to the tunnel furnace cavity of the tunnel furnace body, the product and the AB glue that wraps the product are always in a nitrogen environment, thereby ensuring that during the heating and curing process of the AB glue, oxidation inside the AB glue colloid is avoided, the sealing performance of the AB glue on the product is improved, and the quality of the product is improved.

[0040] The present invention provides a nitrogen tunnel furnace with a vacuum pumping function and a product heating method, which can effectively prevent the AB glue from being oxidized during the heating and curing process, thereby improving the sealing performance of the AB glue to the product and improving the quality of the product.

[0041] The present invention proposes a nitrogen tunnel furnace with a vacuum pumping function and a method for heating a product. The method combines vacuum technology and a nitrogen environment with the air inside the AB glue colloid, effectively solves the problem of residual bubbles inside the AB glue colloid and oxidation during the heating and curing process of the AB glue, improves the sealing performance of the AB glue on the product, and improves the quality of the product. The present invention supports automated production and can meet the needs of modern efficient production. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the following briefly introduces the drawings required for use in the specific implementation or the prior art description. Obviously, the drawings described below are some implementations of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 It is a structural schematic diagram of a nitrogen tunnel furnace with a vacuum pumping function from one viewing angle of the present invention.

[0044] Figure 2 It is a structural schematic diagram of a nitrogen tunnel furnace with a vacuum pumping function from another perspective of the present invention.

[0045] Figure 3 It is a structural schematic diagram of the tunnel furnace body of the present invention.

[0046] Figure 4 It is a structural schematic diagram of the tunnel furnace unit of the present invention.

[0047] Figure 5 It is a structural schematic diagram of the baking device of the present invention from one viewing angle.

[0048] Figure 6 It is a structural schematic diagram of the baking device of the present invention from another viewing angle. DETAILED DESCRIPTION

[0049] In order to make the above and other features and advantages of the present invention more clear, the present invention is further described below in conjunction with the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explaining to those skilled in the art and are only exemplary and not restrictive.

[0050] Combined with the picture Figure 5 According to an embodiment of the present invention, a nitrogen tunnel furnace with a vacuum pumping function is provided, including a tunnel furnace body 1 and a baking device 2.

[0051] The conveying direction of the present invention refers to the direction in which the product is conveyed along the baking device 2 and the tunnel oven 1. Figure 1 , Figure 2 , Figure 5 and Figure 6 shown.

[0052] Combination Figure 2 and Figure 3 According to an embodiment of the present invention, the tunnel furnace body 1 includes a feed port K1 and a discharge port K2. Figure 5 and Figure 6 As shown, the baking device 2 at least includes a baking box 201 .

[0053] One end of the feed port K1 of the tunnel furnace body 1 is sealed and connected to the baking box 201. Figure 1 and Figure 2 The discharge port K2 of the tunnel furnace body 1 is provided with a sealing cover (not shown in the figure).

[0054] like Figure 3 and Figure 4 As shown, according to an embodiment of the present invention, the tunnel furnace body 1 includes a plurality of tunnel furnace units 101 which are sealed and spliced ​​with each other.

[0055] A tunnel furnace cavity 1011 is provided inside each tunnel furnace unit 101 . A nitrogen pipe 1013 is provided on one side of the tunnel furnace unit 101 . The nitrogen pipe 1013 is connected to the tunnel furnace cavity 1011 and is used to fill the tunnel furnace cavity 1011 with nitrogen.

[0056] When the multiple tunnel furnace units 101 are sealed and spliced ​​together, the tunnel furnace cavities 101 of two adjacent tunnel furnace units 101 are connected to each other, and the nitrogen pipes 1013 of two adjacent tunnel furnace units 101 are sealed and connected to each other. Figure 3 After the multiple tunnel furnace units 101 are sealed and spliced ​​together, the nitrogen pipe 1013 is connected to the interface of the nitrogen supply system (the nitrogen supply system is not shown in the figure).

[0057] According to an embodiment of the present invention, a second heating device 1012 is disposed on one side of each tunnel furnace unit 101 for heating the tunnel furnace cavity 1011 .

[0058] The heating temperatures of the second heating devices 1012 of different tunnel oven units 101 are different. For example, in some embodiments, the heating temperature of the second heating devices 1012 of the tunnel oven units 101 gradually increases along the conveying direction.

[0059] For another example, in some other embodiments, along the conveying direction, the heating temperature of the second heating device 1012 of the tunnel furnace unit 101 first gradually increases and then gradually decreases.

[0060] According to an embodiment of the present invention, a second conveying guide rail 1014 is disposed in the tunnel furnace cavity 1011 of each tunnel furnace unit 101. The multiple tunnel furnace units 101 are sealed and spliced ​​with each other, and the second conveying guide rails 1014 of two adjacent tunnel furnace units 101 are spliced ​​with each other.

[0061] like Figure 1 , pictures and Figure 3 As shown, in this embodiment, the tunnel furnace body 1 includes seven mutually sealed and spliced ​​tunnel furnace units 101. In some embodiments, the tunnel furnace units 101 can be more or less, depending on actual needs.

[0062] Combination Figure 1 , Figure 2 , Figure 5 and Figure 6 According to an embodiment of the present invention, the baking device 2 includes at least a baking box 201 , one end of the feed port K1 of the tunnel furnace body 1 is sealed and connected to the baking box 201 , and a baking chamber 202 is formed inside the baking box 201 .

[0063] The baking oven 201 has a feeding door 204 at one end away from the feeding port K1 of the tunnel furnace body 1. The feeding door 204 is provided with a feeding door plate 205 for opening or closing the feeding door 204. Figure 5 shown.

[0064] A discharge door (not shown in the figure) is arranged at one end of the baking box 201 which is sealedly connected to the feed port K1 of the tunnel furnace body 1. The discharge door is provided with a discharge door plate 206 for opening or closing the feed door. Figure 6 After the discharge door plate 206 opens the feed door, the discharge door faces the feed port K1 of the tunnel furnace body 1 .

[0065] In this embodiment, the feed door 204 and the feed door plate 205 have the same structure as the discharge door and the discharge door plate 206. The present invention does not specifically limit the manner in which the feed door plate 205 opens or closes the feed door 204, and the discharge door plate 206 opens or closes the feed door. Those skilled in the art can make settings according to actual needs, for example, the feed door plate 205 is driven by a connecting rod mechanism to open or close the feed door 204, and the discharge door plate 206 is driven by a connecting rod mechanism to open or close the feed door.

[0066] like Figure 5 and Figure 6 As shown, a first pipeline 207 is disposed on one side of the baking oven 201, and the first pipeline 207 is connected to the baking chamber 202. The first pipeline 207 is configured to switch between vacuuming the baking chamber 202 and filling the baking chamber 202 with nitrogen.

[0067] Specifically, according to an embodiment of the present invention, one end of the first pipeline 207 is connected to the baking chamber 202, and the other end of the first pipeline 207 is connected to the first three-way pipe 208. The first three-way pipe 208 includes a first joint 2081 and a second joint 2082. The first joint 2081 is connected to a vacuum pump system (not shown in the figure), and the second joint 2082 is connected to a nitrogen supply system (not shown in the figure).

[0068] Further, the second joint 2082 of the first three-way pipe 208 is connected to the second three-way pipe 209. The second three-way pipe 209 includes a third joint 2091 and a fourth joint 2092. The third joint 2091 is provided with a gas nozzle 211, and the gas nozzle 211 is connected to the interface of the nitrogen supply system, so that the second joint 2082 is connected to the nitrogen supply system. The fourth joint 2092 of the second three-way pipe 209 is provided with a vacuum gauge 210.

[0069] According to an embodiment of the present invention, a butterfly valve (not shown in the figure) is provided at the first joint 2081 of the first three-way pipe 208 .

[0070] When the butterfly valve is opened, the first pipeline 207 is connected to the vacuum pump system through the first three-way pipe 208, and the vacuum pump system evacuates the baking chamber 202. When the vacuum pump system evacuates the baking chamber 202, the vacuum gauge 210 measures the vacuum degree of the baking chamber 202.

[0071] Specifically, when the vacuum pump system evacuates the baking chamber 202 , the vacuum gauge 210 measures the vacuum degree of the baking chamber 202 by measuring the vacuum degree in the first three-way pipe 208 and the second three-way pipe 209 .

[0072] When the butterfly valve is closed, the first pipeline 207 is connected to the nitrogen supply system through the first three-way pipe 208 and the second three-way pipe 209, and nitrogen is filled into the baking chamber 202 through the nitrogen supply system.

[0073] By opening and closing the butterfly valve provided at the first joint 2081 of the first three-way pipe 208, the first pipeline 207 is switched to be connected with the vacuum pump system and the nitrogen supply system, so that the first pipeline 207 switches between evacuating the baking chamber 202 and filling the baking chamber 202 with nitrogen.

[0074] like Figure 5 As shown, according to an embodiment of the present invention, a first conveying guide rail 203 is installed in the baking chamber 202, and the first conveying guide rail 203 is used to convey the product out of the baking chamber 202 through the discharge door.

[0075] Furthermore, a second pipeline 212 is further provided on one side of the baking box 201 , one end of the second pipeline 212 is connected to the baking chamber 202 , and the other end of the second pipeline 212 is connected to the first heating device 213 . The first heating device 213 heats the baking chamber 202 through the second pipeline 212 .

[0076] According to an embodiment of the present invention, a method for heating a product is provided, wherein the product is heated using a nitrogen tunnel furnace with a vacuum pumping function provided by the present invention, comprising the following method steps:

[0077] Step S1 , opening the feeding door panel 205 of the baking box 201 , and placing the product on the first conveying guide rail 203 in the baking chamber 202 .

[0078] Specifically, after the AB glue is mixed and wrapped with the product (such as an electric vehicle charging connector), the product is placed in a tray. The feeding door panel 205 of the baking box 201 is opened, and the tray with the product is placed on the first conveying guide rail 203 in the baking chamber 202.

[0079] Step S2, closing the feeding door panel 205 and the discharging door panel 206 of the baking box 201, so that a closed space is formed in the baking chamber 202.

[0080] Specifically, the feed door plate 205 closes the feed door 204 of the baking oven 201 , and the discharge door plate 206 closes the discharge door of the baking oven 201 , so that a closed space is formed in the baking chamber 202 .

[0081] Step S3, opening the butterfly valve at the first joint 2081 of the first three-way pipe 208, and simultaneously starting the system, and the vacuum pump system evacuates the baking chamber 202.

[0082] Specifically, the butterfly valve at the first joint 2081 of the first three-way pipe 208 is opened, and the system is turned on at the same time, and the vacuum pump system evacuates the baking chamber 202 to discharge the bubbles in the AB glue colloid.

[0083] When the vacuum pump system evacuates the baking chamber 202 , the vacuum gauge 210 measures the vacuum degree of the baking chamber 202 in real time.

[0084] Step S4: the vacuum pump system stops evacuating the baking chamber 202 and closes the butterfly valve at the first joint 2081 of the first three-way pipe 208. The nitrogen supply system is turned on to fill the baking chamber 202 with nitrogen, and the first heating device 213 heats the baking chamber 202.

[0085] Specifically, when the vacuum gauge 210 detects that the vacuum degree of the baking chamber 202 reaches a preset vacuum degree, the vacuum pump system stops evacuating the baking chamber 202 and closes the butterfly valve at the first joint 2081 of the first three-way pipe 208 .

[0086] The nitrogen supply system is turned on, and the nitrogen supply system fills the baking chamber 202 with nitrogen through the air nozzle 211 until the air pressure in the baking chamber 202 returns to normal pressure, so that the AB glue is in an oxygen-free environment. After that, the first heating device 213 is turned on to heat the baking chamber 202.

[0087] Step S5 : the nitrogen supply system fills nitrogen into the tunnel furnace cavity 1011 of each tunnel furnace unit 101 through the nitrogen pipe 1013 , and the second heating device 1012 heats the tunnel furnace cavity 1011 of each tunnel furnace unit 101 .

[0088] Specifically, the heating temperatures of the second heating devices 1012 of different tunnel furnace units 101 are different. In this embodiment, by setting a temperature curve, the heating temperature of the second heating devices 1012 of the tunnel furnace units 101 gradually increases and then gradually decreases along the conveying direction.

[0089] Step S6, opening the discharge door 206 of the baking box 201. Along the conveying direction, the first conveying rail 203 conveys the product out of the baking chamber 202 through the discharge door, and conveys the product to the second conveying rail 1014 through the feed port K1 of the tunnel furnace body 1.

[0090] Step S7, along the conveying direction, the second conveying track 1014 conveys the product to the tunnel furnace cavity 1011 in each tunnel furnace unit 101 in turn, and the second heating device 1012 of each tunnel furnace unit 101 heats the product in turn according to the set temperature curve, so that the AB glue is heated and cured.

[0091] Step S8: The second conveying rail 1014 conveys the product out of the nitrogen tunnel furnace through the discharge port K2 of the tunnel furnace body 1.

[0092] Specifically, the second conveying rail 1014 conveys the product to the discharge port K2 of the tunnel furnace body 1, opens the sealing cover of the discharge port K2 of the tunnel furnace body 1, and the second conveying rail 1014 conveys the product out of the nitrogen tunnel furnace from the discharge port K2 of the tunnel furnace body 1.

[0093] The present invention targets the air inside the AB glue colloid and introduces a method combining vacuum technology and nitrogen environment, which effectively solves the problems of residual bubbles inside the AB glue colloid and oxidation during the heating and curing process of the AB glue, improves the sealing performance of the AB glue on the product, and improves the quality of the product.

[0094] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A nitrogen tunnel furnace with vacuum pumping function, characterized in that: The nitrogen tunnel furnace comprises a tunnel furnace body and a baking device, wherein the tunnel furnace body comprises a feed inlet and a discharge outlet, and the baking device comprises at least one baking box; Wherein, one end of the feed port of the tunnel furnace body is sealed and connected to the baking box, and a baking chamber is formed inside the baking box; A feeding door is provided at one end of the baking oven away from the feeding port of the tunnel furnace body; the feeding door is provided with a feeding door plate for opening or closing the feeding door; A discharge door is arranged at one end of the baking oven that is sealed and connected to the feed port of the tunnel furnace body. The discharge door is provided with a discharge door plate for opening or closing the feed door, and the discharge door faces the feed port of the tunnel furnace body. A first pipeline is provided on one side of the baking oven, the first pipeline is connected to the baking chamber, and the first pipeline is configured to switch between evacuating the baking chamber and filling the baking chamber with nitrogen.

2. The nitrogen tunnel furnace according to claim 1, characterized in that: A second pipeline is also provided on one side of the baking oven, one end of the second pipeline is connected to the baking chamber, and the other end of the second pipeline is connected to the first heating device; The first heating device heats the baking chamber through the second pipeline.

3. The nitrogen tunnel furnace according to claim 1, characterized in that: One end of the first pipeline is connected to the baking chamber, and the other end of the first pipeline is connected to a first three-way pipe; The first three-way pipe includes a first joint and a second joint; the first joint is connected to a vacuum pump system, and the second joint is connected to a nitrogen supply system; Wherein, a butterfly valve is arranged at the first joint of the first three-way pipe; when the butterfly valve is opened, the first pipeline is connected to the vacuum pump system through the first three-way pipe, and the baking chamber is evacuated by the vacuum pump system; When the butterfly valve is closed, the first pipeline is connected to the nitrogen supply system through the first three-way pipe, and nitrogen is filled into the baking chamber through the nitrogen supply system.

4. The nitrogen tunnel furnace according to claim 3, characterized in that: The second joint of the first tee is connected to the second tee; The second three-way pipe includes a third joint and a fourth joint; the third joint is provided with a gas nozzle, the gas nozzle is connected to the interface of the nitrogen supply system, and the fourth joint is provided with a vacuum gauge; When the vacuum pump system evacuates the baking chamber, the vacuum gauge measures the vacuum degree of the baking chamber.

5. The nitrogen tunnel furnace according to claim 1, characterized in that: A first conveying guide rail is installed in the baking chamber, and the first conveying guide rail is used to convey the product out of the baking chamber through the discharge door.

6. The nitrogen tunnel furnace according to claim 1, characterized in that: The tunnel furnace body comprises a plurality of tunnel furnace units which are sealed and spliced ​​with each other; Wherein, a tunnel furnace cavity is opened inside each tunnel furnace unit, and a nitrogen pipe is arranged on one side of the tunnel furnace unit, and the nitrogen pipe is connected to the tunnel furnace cavity for filling the tunnel furnace cavity with nitrogen; The tunnel furnace cavities of two adjacent tunnel furnace units are interconnected, and the nitrogen pipes of two adjacent tunnel furnace units are sealed and connected to each other.

7. The nitrogen tunnel furnace according to claim 6, characterized in that: A second heating device is also provided on one side of each tunnel furnace unit for heating the tunnel furnace cavity.

8. The nitrogen tunnel furnace according to claim 7, characterized in that: The heating temperatures of the second heating devices of different tunnel furnace units are different.

9. The nitrogen tunnel furnace according to claim 6, characterized in that: A second conveying guide rail is arranged in the tunnel furnace cavity of each tunnel furnace unit; The plurality of tunnel furnace units are sealed and spliced ​​with each other, and the second conveying guide rails of two adjacent tunnel furnace units are spliced ​​with each other.

10. A method for heating a product, characterized in that: The method uses the nitrogen tunnel furnace described in any one of claims 1 to 9 to heat the product, comprising the following method steps: S1. Open the feeding door of the baking oven and place the product on the first conveying rail in the baking chamber; S2, closing the feeding door panel and the discharging door panel of the baking oven to form a closed space in the baking chamber; S3, opening the butterfly valve at the first joint of the first three-way pipe, and at the same time starting the vacuum pump system, so that the vacuum pump system evacuates the baking chamber; S4, the vacuum pump system stops evacuating the baking chamber, and closes the butterfly valve at the first joint of the first three-way pipe; The nitrogen supply system is turned on, the nitrogen supply system fills nitrogen into the baking chamber, and the first heating device heats the baking chamber; S5, the nitrogen supply system fills the tunnel furnace cavity of each tunnel furnace unit with nitrogen through the nitrogen pipe, and the second heating device heats the tunnel furnace cavity of each tunnel furnace unit; S6, opening the discharge door panel of the baking box; along the conveying direction, the first conveying rail conveys the product out of the baking chamber from the discharge door, and conveys it to the second conveying rail from the feed port of the tunnel furnace body; S7, along the conveying direction, the second conveying track conveys the product to the tunnel furnace cavity in each tunnel furnace unit in sequence, and the second heating device of each tunnel furnace unit heats the product in sequence; S8. The second conveying rail conveys the product out of the nitrogen tunnel furnace from the discharge port of the tunnel furnace body.

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