An on-line continuous nitriding device for strip

Abstract

The application discloses a kind of plate strip on-line continuous nitriding device, it is related to nitriding device field;Including box, box left end first end cover is equipped with guide stick, box is connected with assembly type thermocouple thermometer and pressure gauge;Box inside is welded with support plate, support plate is sequentially placed with preheating box, reaction box and slow cooling box, first heat insulation plate is equipped between preheating box and reaction box, first heat insulation plate is equipped between reaction box and slow cooling box;Magnet device is mounted on the inner wall of box, magnet device is located at the upper and lower ends of reaction box;Box right end is sequentially provided with cooling device, flattening device and reel device;Box outside is equipped with the box door that can be lifted;Preheating box, reaction box, slow cooling box both sides and first heat insulation plate are all equipped with corresponding rectangular opening, rectangular opening is used to pass through plate strip;Gas inlet pipe is provided in reaction box, nitrogen cylinder is connected to gas inlet pipe.The application has high production efficiency, high degree of mechanization and automation, and is suitable for continuous nitriding of plate strip.

Description

Technical Field

[0001] This invention relates to the field of nitriding equipment technology, and in particular to a plate and strip online continuous nitriding equipment. Background Technology

[0002] Currently, sheet metal and strip steel are widely used in my country, which places high demands on their quality. Furthermore, sheet metal and strip steel used in specific environments require high wear resistance, high fatigue resistance, and high corrosion resistance. Traditional sheet metal and strip steel cannot meet these requirements, making the manufacture of production equipment with such high wear resistance and corrosion resistance particularly important.

[0003] Nitriding is a chemical heat treatment process that diffuses nitrogen into the surface of a workpiece to form a nitrogen-rich hardened layer. Nitriding is a heat treatment process that can improve the hardness, wear resistance, fatigue strength, and corrosion resistance of steel surfaces. The nitrided layer is very thin and does not affect the properties of the substrate, while also improving the surface quality of the strip. Traditional nitriding methods involve placing the workpiece in a nitriding furnace for nitriding. This method can only nitrid a small number of workpieces at a time, resulting in low efficiency and cumbersome steps, making it unsuitable for strip nitriding. Furthermore, a significant characteristic of nitriding is its long process cycle, leading to low efficiency, and ordinary nitrided surfaces are prone to brittleness. Summary of the Invention

[0004] The purpose of this invention is to provide an online continuous nitriding device for strip and plate, which solves the problems existing in the prior art, has high production efficiency, high degree of mechanization and automation, and is suitable for continuous nitriding of strip and plate.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides an online continuous nitriding device for strip and plate, comprising a housing with a fixed base at the bottom of the housing, the fixed base being welded to the housing and fixedly connected to the ground. A guide rod is installed at the first end cap on the left side of the housing. An assembled thermocouple thermometer and a pressure gauge are connected to the housing for measuring the temperature and pressure inside the housing. A support plate is welded inside the housing, on which a preheating chamber, a reaction chamber, and a slow cooling chamber are sequentially placed. A first heat insulation plate is provided between the preheating chamber and the reaction chamber, and between the reaction chamber and the slow cooling chamber. A magnet device is installed on the inner wall of the housing, located at the upper and lower ends of the reaction chamber. A cooling device, a leveling device, and a winding device are sequentially provided on the right side of the housing. A liftable door is provided on the outside of the housing. Rectangular openings are provided on both sides of the preheating chamber, the reaction chamber, the slow cooling chamber, and on the first heat insulation plate, for the strip and plate to pass through. An inlet pipe is provided inside the reaction chamber, and a nitrogen cylinder is connected to the outside of the inlet pipe.

[0007] Optionally, the outer side of the chamber is provided with symmetrically arranged T-shaped grooves, the chamber door is slidably disposed in the T-shaped grooves, and a rectangular hole is opened on the chamber door at the position corresponding to the pressure gauge. The rectangular hole is filled with heat-resistant glass for observing the pressure gauge reading inside the chamber; a chamber door lifting device is installed on the upper side of the chamber.

[0008] Optionally, the door lifting device includes a crossbeam, which is welded to the upper surface of the box body. A second bearing seat is mounted on the crossbeam, and a horizontally arranged rotating shaft is connected to the second bearing seat through a bearing. First sprockets are mounted at both ends of the rotating shaft. A motor is mounted on the crossbeam, and the output shaft of the motor is driven to two second sprockets. A chain is wound around the second sprocket and the first sprocket located on the same side. One end of the chain is fixedly connected to the box door, and the other end is connected to a counterweight for balance.

[0009] Optionally, the preheating chamber is equipped with a second guide shaft, which is fixed inside the preheating chamber by a shaft fixing seat in a staggered manner. This can increase the reaction area of ​​the strip and improve working efficiency. Multiple heating rods are fixedly installed on the inner wall of the preheating chamber, with a maximum heating temperature of 900℃. A furnace door is hinged to the wall of the preheating chamber, and a furnace door handle is fixedly installed on the outside of the furnace door. A pressure gauge is installed on the furnace door, and a locking wrench is installed on the end of the furnace door away from the hinge. The locking wrench can be fixedly connected to the locking port on the side wall of the preheating chamber. An assembled thermocouple thermometer is connected to the inner wall of the preheating chamber, with its wires extending through the chamber wall for measuring the temperature inside the preheating chamber. A second heat insulation plate is provided between the furnace door and the inner wall of the preheating chamber. The second heat insulation plate has a U-shaped structure, which helps to improve airtightness and allow observation of the reaction state when the furnace door is open. The slow cooling chamber has the same structure as the preheating chamber, and the heating rods in the slow cooling chamber have a heating temperature not exceeding 600℃.

[0010] Optionally, the reaction chamber is equipped with a second guide shaft, which is fixed inside the reaction chamber by a shaft fixing seat with a vertical offset. Multiple heating rods are fixedly installed on the inner wall of the reaction chamber, with a maximum heating temperature of 1200℃. A furnace door is hinged to the reaction chamber wall, and a furnace door handle is fixedly installed on the outside of the furnace door. A pressure gauge is installed on the furnace door, and a locking wrench is installed at the end of the furnace door away from the hinge, which can be fixedly connected to the locking port on the side wall of the reaction chamber. An assembled thermocouple thermometer is connected to the inner wall of the reaction chamber. A second heat insulation plate with a U-shaped structure is provided between the furnace door and the inner wall of the reaction chamber. The end of the inlet pipe away from the nitrogen cylinder passes through the bottom wall and side wall of the chamber and enters the reaction chamber. A valve and a pressure gauge are installed on the inlet pipe. An outlet pipe is provided above the reaction chamber, passing through the chamber wall and top wall and extending out to connect to a waste gas collection device. A valve is installed on the outlet pipe.

[0011] Optionally, the cooling device includes a cooling box and a cooling device support frame. The cooling box is placed on the support frame, which is fixedly connected to the ground. The cooling box includes a cooling box body, a box cover installed on the top of the cooling box body, an air nozzle installed on the inner side of the box cover, the air nozzle being threadedly connected to the box cover, an air pipe and a handle installed on the outer side of the box cover, the air pipe being threadedly connected to the box cover, and the handle being welded to the box cover. Four third guide shafts are installed inside the cooling box body. Two of the third guide shafts are connected to the upper inner wall of the cooling box body through a first bearing seat and a bearing, and the other two third guide shafts are connected to the lower inner wall of the cooling box body through a first bearing seat and a bearing. The cooling box body contains water or coolant, and rectangular openings are provided on both sides of the cooling box body to facilitate the passage of the strip. During installation, if the strip passes through the two upper guide shafts, it can be cooled by the air nozzles, achieving air cooling; if the strip also passes through the two lower guide shafts, it can be cooled by the water or coolant inside the cooling box body, achieving water cooling.

[0012] Optionally, the leveling device includes a frame, a second end cover, and leveling shafts. The frame is fixedly connected to the ground, and multiple leveling shafts are connected to the frame through bearings and the second end cover. The multiple leveling shafts are staggered vertically to level the strip before it is rolled up after it has cooled, thereby improving the flatness of the strip.

[0013] Optionally, the reel device includes a reel support frame, bearings, and a reel. The reel support frame is fixedly connected to the ground, and the reel is connected to the reel support frame through the bearings. The reel is provided with a keyway connected to the reel motor, the purpose of which is to roll up the strip after leveling for easy storage.

[0014] Optionally, the magnet device includes a magnet block, a magnet mounting bracket, and a stop plate; the magnet mounting bracket is fixed to the support plate by bolts, and the stop plate is fixed to the magnet block and the magnet mounting bracket by bolts; the magnet block is wound with a wire, and the wire is wrapped with an insulating sleeve; the upper and lower sides of the housing are equipped with terminals corresponding to the magnet block, and the terminals are respectively connected to the power leads of the corresponding magnet block.

[0015] The present invention achieves the following technical effects compared to the prior art:

[0016] This invention improves upon traditional nitriding mechanisms by employing an online continuous nitriding system. This not only achieves surface nitriding of strips but also ensures automation, continuity, and high efficiency in the process. It overcomes the limitation of traditional nitriding furnaces, which cannot perform online nitriding of strips. For strips of varying thicknesses, the shape and size of the rectangular openings in the enclosure, preheating chamber, reaction chamber, slow cooling chamber, and cooling chamber can be varied, thus making this production device widely applicable. The invention utilizes nitriding under a magnetic field, improving nitriding efficiency. Furthermore, magnetic field nitriding reduces workpiece deformation, improves the performance of the nitrided layer, and forms a dense compound layer on the surface, reducing the brittleness of the nitride and ensuring effective online nitriding. The enclosure door opening and closing mechanism of this invention is simple in structure and highly automated, ensuring high production efficiency. The cooling device of this invention can switch between air cooling and water cooling, facilitating the coordination of different process requirements. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front view schematic diagram of the present invention;

[0019] Figure 2 This is a top view of the present invention;

[0020] Figure 3 This is a schematic diagram of the left side of the present invention;

[0021] Figure 4 This is a half-sectional schematic diagram of the present invention;

[0022] Figure 5 This is a cross-sectional view (AA) of the present invention;

[0023] Figure 6 This is a BB cross-sectional view of the present invention;

[0024] Figure 7 This is a schematic diagram of the magnet device of the present invention;

[0025] Explanation of reference numerals in the attached drawings: 1-Box body, 2-Box door, 3-Box door lifting device, 301-Chain, 302-Crossbeam, 303-First sprocket, 304-Rotating shaft, 305-Second bearing seat, 306-First bearing, 307-Counterweight, 308-Motor, 309-Second sprocket, 4-Belt, 5-Cooling device, 501-Box cover, 502-Air nozzle, 503-Handle, 504-Air pipe, 505-Cooling box body, 506-Third guide shaft, 507-First bearing seat, 508-Cooling device support frame, 6-Leveling device, 601-Frame, 602-Second end cover, 603-Leveling shaft, 7-Rolling device, 701-Rolling support frame 702-Second bearing, 703-Roller, 8-Fixed bracket, 9-Terminal, 10-First end cap, 11-First guide shaft, 12-Preheating box, 13-Support plate, 14-First heat insulation plate, 15-Reaction box, 16-Magnet device, 1601-Magnet fixing bracket, 1602-Magnet block, 1603-Baffle plate, 17-Inlet pipe, 18-Slow cooling box, 19-Furnace door, 20-Locking wrench, 21-Furnace door wrench, 22-Hinge, 23-Outlet pipe, 24-Second guide shaft, 25-Heating rod, 26-Second heat insulation plate, 27-Second guide shaft fixing seat, 28-Assembled thermocouple thermometer, 29-Pressure gauge, 30-Heat-resistant glass, 31-Valve. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The purpose of this invention is to provide an online continuous nitriding device for strip and plate, which solves the problems existing in the prior art, has high production efficiency, high degree of mechanization and automation, and is suitable for continuous nitriding of strip and plate.

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Reference Appendix Figure 1 Appendix Figure 2 Appendix Figure 3 Appendix Figure 4 Appendix Figure 5 Appendix Figure 6 and attached Figure 7As shown, this invention provides an online continuous nitriding device for strip metal, including a housing 1. The housing 1 is fixedly connected to the ground via a fixing frame 8. A support plate 13 is welded inside the housing. A preheating box 12, a reaction box 15, a slow cooling box 18, and a first heat insulation plate 14 are placed on the support plate 13. The first heat insulation plate 14 is placed between the preheating box 12 and the reaction box 15, and between the reaction box 15 and the slow cooling box 18. Rectangular openings are provided on both sides of the preheating box, the reaction box, the slow cooling box, and on the first heat insulation plate, with corresponding openings. The strip metal 4 can pass through the rectangular openings sequentially through the preheating box, the first heat insulation plate, the reaction box, the first heat insulation plate, and the slow cooling box. A first guide shaft 11 is provided on the left side of the housing 1. The first guide shaft 11 is connected to the housing via a bearing, a first end cover 10, and bolts. Specifically, the end of the first guide shaft is connected to the bearing, the bearing is mounted on the end cover, and the end cover is connected to the housing via bolts. A modular thermocouple thermometer 28 is installed on the upper side of the chamber 1. The modular thermocouple thermometer 28 is connected to the chamber wall by threads and is used to measure the temperature inside the chamber. A pressure gauge 29 is installed on the left side of the chamber. The pressure gauge 29 is connected to the chamber wall by threads and is used to measure the pressure inside the chamber. Magnet devices 16 are installed on the inner walls of the chamber in both the upper and lower directions. The magnet fixing bracket 1601 of the magnet device 16 is connected to the support plate by bolts. There are six magnet blocks 1602 on the magnet fixing bracket 1601. The magnet blocks are wound with wires, and the wires are wrapped with insulating sleeves. The magnet block is connected to the magnet fixing frame 1601 via a stop plate 1603 and bolts. There are six terminals 9 on the upper and lower sides of the outer side of the housing for connecting the power wires of the magnet block. A reel device 7 is provided on the outer side of the housing away from the first guide shaft 11. The reel device 7 includes a reel support frame 701, a second bearing 702 and a reel 703. The reel support frame is fixedly connected to the ground. The reel is connected to the reel support frame via the bearing. The reel is provided with a keyway for easy connection to the reel motor. In operation, the present invention guides the strip 4 into the housing via the first guide shaft 11. The strip passes sequentially through the preheating chamber, the reaction chamber, and the slow cooling chamber. It is preheated in the preheating chamber to facilitate the subsequent reaction. It is heated to the reaction temperature in the reaction chamber and nitrogen is introduced into it to cause nitriding of the strip. Excess gas can be discharged through the gas outlet pipe. The strip after nitriding is preheated in the slow cooling chamber. Then, the winding motor is started, and the nitrided strip is wound and collected by the winding device. This realizes continuous production of strip nitriding with high overall efficiency.

[0030] In a further preferred embodiment, the preheating chamber 12 is equipped with a second guide shaft 24 and heating rods 25. The second guide shaft 24 is connected to the inner wall of the preheating chamber via a second guide shaft fixing seat. The heating rods 25 are connected to the preheating chamber wall via threads and welding. There are three heating rods 25 in total. The maximum heating temperature of the preheating chamber is 900℃. An assembled thermocouple thermometer is connected to the preheating chamber wall via threads, and the wire extends through the chamber wall to measure the temperature inside the preheating chamber. The furnace door 19 is hinged to the preheating chamber wall via a hinge. A furnace door wrench 21 is welded to the furnace door. The furnace door is opened and closed via a hinge 22 and locked via a locking wrench 20. A pressure gauge is connected to the furnace door via threads to measure the pressure inside the preheating chamber. A second heat insulation plate 26 is installed between the furnace door and the preheating chamber wall. The second heat insulation plate has a U-shaped structure to improve airtightness and facilitate observation of the reaction state when the furnace door is open.

[0031] The reaction chamber 15 is equipped with a second guide shaft 24 and heating rods 25. The second guide shaft is connected to the inner wall of the reaction chamber via a second guide shaft fixing seat 27. The heating rods are connected to the reaction chamber wall via threads and welding. There are six heating rods in total. The maximum heating temperature of the reaction chamber is 1200℃. An assembled thermocouple thermometer is connected to the reaction chamber wall via threads, and the wire extends through the chamber wall to measure the temperature inside the preheating chamber. The furnace door 19 is hinged to the reaction chamber wall via a hinge. A furnace door wrench 21 is welded to the furnace door. The furnace door is opened and closed via a hinge 22 and locked via a locking wrench 20. A pressure gauge is connected to the furnace door via threads to measure the pressure inside the reaction chamber. A second heat insulation plate 26 is installed between the furnace door and the reaction chamber wall. The second heat insulation plate has a U-shaped structure to improve airtightness and allow observation of the reaction status when the furnace door is open. An inlet pipe 17 extends into the reaction chamber through the chamber body and reaction chamber wall. The second end of the inlet pipe is connected to a nitrogen (N2) cylinder to allow nitrogen to enter the reaction chamber for the nitriding reaction. A valve 31 and a pressure gauge 29 are installed on the inlet pipe to control gas intake and monitor gas pressure. An outlet pipe 23 passes through the reaction chamber wall and chamber body and is connected to a waste gas collection device. A valve 31 is also connected to the outlet pipe to control waste gas outflow.

[0032] The slow cooling chamber 18 is equipped with a second guide shaft 24 and heating rods 25. The second guide shaft is connected to the inner wall of the slow cooling chamber through a second guide shaft fixing seat. The heating rods are connected to the preheating chamber wall through threads and welding. There are three heating rods in total. The heating temperature of the slow cooling chamber does not exceed 600℃. The assembled thermocouple thermometer 28 is connected to the slow cooling chamber wall through threads, and the wire extends through the chamber wall to measure the temperature inside the preheating chamber. The furnace door 19 is hinged to the slow cooling chamber wall through a hinge. A furnace door wrench 21 is welded on the furnace door. The furnace door is opened and closed through a hinge 22 and locked through a locking wrench 20. The pressure gauge 29 is connected to the furnace door through threads to measure the pressure inside the slow cooling chamber. A second heat insulation plate 26 is installed between the furnace door and the slow cooling chamber wall. The second heat insulation plate has a U-shaped structure to improve airtightness and facilitate observation of the reaction state when the furnace door is open.

[0033] In another embodiment, in order to facilitate the handling of the precooling chamber, reaction chamber and slow cooling chamber, and to facilitate the inspection and observation of the interior of the chamber, this embodiment has a door 2 on the front side of the chamber. The door 2 is guided by a T-slot on the front side of the chamber. A rectangular hole is opened on the door corresponding to the pressure gauge position, and heat-resistant glass 30 is installed for observing the pressure gauge reading inside the chamber. A door lifting device 3 is installed on the upper side of the box body. The door lifting device includes a chain 301, a crossbeam 302, a first sprocket 303, a rotating shaft 304, a second bearing seat 305, a first bearing 306, a counterweight 307, a motor 308, and a second sprocket 309. The crossbeam 302 is welded and fixed to the upper side of the box body. The second bearing seat 305 is mounted on the crossbeam. The rotating shaft 304 is connected to the second bearing seat through a bearing. The first sprockets 303 are mounted at both ends of the rotating shaft. The motor 308 is mounted on the crossbeam. The motor is connected to the crossbeam through a flange and bolts. The motor shaft drives two coaxially arranged second sprockets, which can... The motor drives two second sprockets to rotate. The first and second sprockets are equipped with chains 301. The end of the chain 301 closest to the first sprocket is connected to a door, and the end of the chain closest to the second sprocket is connected to a counterweight 307. The counterweight 307 is used to ensure balance, so that items can be put in, taken out, and inspected through the door. The motor drives the second sprocket to rotate, and the chain meshing at the top of the second sprocket rotates synchronously, which in turn drives the first sprocket to rotate. The chain follows the sprocket to rotate forward or backward, so as to raise or lower the door. The counterweight and the door are located at the two ends of the chain, similar to the structure of the car and counterweight in an elevator.

[0034] In actual production and use, the inventors considered that the temperature of the strip after nitriding is too high. If it is directly wound and collected, it is easy to cause subsequent deformation, insufficient flatness, and damage to the strip. When operators lift the finished strip in rolls, burns are more likely to occur. Based on this, the inventors introduced a cooling device in another embodiment. The cooling device is set between the box and the winding device. Specifically, the cooling device 5 includes a cooling box and a cooling device support frame 508. The cooling box is placed on the cooling device support frame 508, which is fixedly connected to the ground. The cooling box is divided into upper and lower parts, namely a box cover 501 and a cooling box body 505. The inner side of the box cover 501 is equipped with an air nozzle 502, which is threadedly connected to the box cover. The outer side of the box cover is equipped with an air pipe 504 and a handle 503, which is threadedly connected to the box cover. The handle is welded to the box cover. The cooling box body is equipped with four third guide shafts 506. The third guide shafts are connected to the inner wall of the box body through a first bearing seat 507 and a bearing. During installation, if the strip passes through the two upper guide shafts, it can be cooled by air jets; if it also passes through the two lower guide shafts, it can be cooled by water or coolant inside the cooling box. To make the cooled strip flatter and improve winding efficiency, the inventors have uniquely designed a flattening device 6 at the rear end of the cooling device. The flattening device 6 includes a frame 601, a second end cover 602, and flattening shafts 603. The frame is fixedly connected to the ground, and the flattening shafts are connected to the frame via bearings and the second end cover. There are five flattening shafts in total, staggered vertically, through which the strip passes, with the purpose of flattening it after cooling.

[0035] The working process of this invention is as follows: Before operation, the heating rod is energized so that the preheating box 12, reaction box 15 and slow cooling box 18 reach the corresponding temperatures. At the same time, the magnet is energized, and the nitriding reaction is carried out under the action of the magnetic field. The gas inlet pipe is opened to allow nitrogen gas to enter the reaction box 15. After the reaction box 15 is filled with gas, the gas outlet pipe is opened to discharge the unreacted gas into the waste gas collection device. The strip 4 passes through the preheating box, reaction box and slow cooling box in sequence. After the reaction is completed, it passes through the cooling box, which can be air-cooled or water-cooled. After cooling, it is leveled by the leveling device 6. Finally, the strip is rolled up by the winding device 7 for easy storage.

[0036] In the description of this invention, it should be noted that the terms "center," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A continuous online nitriding device for strip and plate, characterized in that: The enclosure includes a housing with a guide rod at the first end cap on the left side. A thermocouple thermometer and pressure gauge are connected to the housing for measuring the temperature and pressure inside. A support plate is welded inside the housing, on which a preheating chamber, a reaction chamber, and a slow-cooling chamber are sequentially placed. A first heat insulation plate is installed between the preheating chamber and the reaction chamber, and between the reaction chamber and the slow-cooling chamber. Magnets are installed on the inner wall of the housing, located at the top and bottom of the reaction chamber. A cooling device, a leveling device, and a reel device are sequentially located at the right end of the housing. A liftable door is located on the outer side of the housing. Rectangular openings are provided on both sides of the preheating chamber, reaction chamber, and slow-cooling chamber, as well as on the first heat insulation plate, for the passage of the strip. Nitriding of strips of different thicknesses allows for adjustments to the housing, preheating chamber, reaction chamber, slow-cooling chamber, and cooling chamber. The shape and dimensions of the rectangular opening; the reaction chamber is equipped with an inlet pipe, and a nitrogen cylinder is connected to the inlet pipe; the outer side of the chamber is provided with symmetrically arranged T-slots, and the chamber door is slidably disposed in the T-slots. A rectangular hole is opened on the chamber door at the position corresponding to the pressure gauge, and heat-resistant glass is installed in the rectangular hole for observing the pressure gauge reading inside the chamber; a chamber door lifting device is installed on the upper side of the chamber; the chamber door lifting device includes a crossbeam, which is welded to the upper surface of the chamber. A second bearing seat is installed on the crossbeam, and the second bearing seat is connected to a horizontally arranged rotating shaft through a bearing. First sprockets are installed at both ends of the rotating shaft. A motor is installed on the crossbeam, and the output shaft of the motor is driven to two second sprockets. A chain is wound around the second sprocket and the first sprocket located on the same side. One end of the chain is fixedly connected to the chamber door, and the other end is connected to a counterweight.

2. The online continuous nitriding device for strip and plate according to claim 1, characterized in that: The preheating chamber is equipped with a second guide shaft, which is fixed inside the preheating chamber by a shaft fixing seat with a vertical offset. Multiple heating rods are fixedly installed on the inner wall of the preheating chamber. A furnace door is hinged to the wall of the preheating chamber, and a furnace door handle is fixedly installed on the outside of the furnace door. A pressure gauge is installed on the furnace door, and a locking wrench is installed at the end of the furnace door away from the hinge, which can be fixedly connected to a locking port on the side wall of the preheating chamber. An assembled thermocouple thermometer is connected to the inner wall of the preheating chamber. A second heat insulation plate with a U-shaped structure is provided between the furnace door and the inner wall of the preheating chamber. The slow cooling chamber has the same structure as the preheating chamber.

3. The online continuous nitriding device for strip and plate according to claim 1, characterized in that: The reaction chamber is equipped with a second guide shaft, which is fixed inside the reaction chamber by a shaft fixing seat with a vertical offset. Multiple heating rods are fixedly installed on the inner wall of the reaction chamber. A furnace door is hinged to the reaction chamber wall, and a furnace door handle is fixedly installed on the outside of the furnace door. A pressure gauge is installed on the furnace door, and a locking wrench is installed at the end of the furnace door away from the hinge, which can be fixedly connected to the locking port on the side wall of the reaction chamber. An assembled thermocouple thermometer is connected to the inner wall of the reaction chamber. A second heat insulation plate with a U-shaped structure is provided between the furnace door and the inner wall of the reaction chamber. The end of the inlet pipe away from the nitrogen cylinder passes through the bottom wall and side wall of the chamber and enters the reaction chamber. A valve and a pressure gauge are installed on the inlet pipe. An outlet pipe is located above the reaction chamber, passing through the chamber wall and top wall and extending out to connect to a waste gas collection device. A valve is installed on the outlet pipe.

4. The online continuous nitriding device for strip and plate according to claim 1, characterized in that: The cooling device includes a cooling box and a cooling device support frame. The cooling box is placed on the support frame, which is fixedly connected to the ground. The cooling box includes a cooling box body, a box cover installed on the top of the cooling box body, an air nozzle installed on the inside of the box cover, the air nozzle being threadedly connected to the box cover, an air pipe and a handle installed on the outside of the box cover, the air pipe being threadedly connected to the box cover, and the handle being welded to the box cover. The cooling box body contains four third guide shafts, two of which are connected to the upper inner wall of the cooling box body through a first bearing seat and a bearing, and the other two third guide shafts are connected to the lower inner wall of the cooling box body through a first bearing seat and a bearing. The cooling box body contains water or coolant.

5. The online continuous nitriding device for strip and plate according to claim 1, characterized in that: The leveling device includes a frame, a second end cover, and leveling shafts. The frame is fixedly connected to the ground, and multiple leveling shafts are connected to the frame through bearings and the second end cover. The multiple leveling shafts are staggered vertically.

6. The online continuous nitriding device for strip and plate according to claim 1, characterized in that: The reel device includes a reel support frame, bearings, and a reel. The reel support frame is fixedly connected to the ground, and the reel is connected to the reel support frame through the bearings. The reel is provided with a keyway that is connected to the reel motor.

7. The online continuous nitriding device for strip and plate according to claim 1, characterized in that: The magnet device includes a magnet block, a magnet mounting bracket, and a stop plate; the magnet mounting bracket is fixed to the support plate by bolts, and the stop plate is fixed to the magnet block and the magnet mounting bracket by bolts; the magnet block is wound with a wire, and the wire is wrapped with an insulating sleeve; the upper and lower sides of the housing are equipped with terminals corresponding to the magnet block, and the terminals are respectively connected to the power leads of the corresponding magnet block.

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